960 results on '"T. Graf"'
Search Results
2. Severe hypoxemia and stroke caused by a patent foramen ovale with right-to-left interatrial shunt despite normal right atrial pressures
- Author
-
C. Marquetand, U. Stierle, I. Buchmann, M. John, C. Busch-Tilge, G. Fuernau, T. Graf, T. Kurz, I. Eitel, and J.C. Reil
- Subjects
Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Published
- 2021
- Full Text
- View/download PDF
3. Impact‐Based Forecasting for Pluvial Floods
- Author
-
V. Rözer, A. Peche, S. Berkhahn, Y. Feng, L. Fuchs, T. Graf, U. Haberlandt, H. Kreibich, R. Sämann, M. Sester, B. Shehu, J. Wahl, and I. Neuweiler
- Subjects
early warning ,impact‐based forecasting ,pluvial floods ,Environmental sciences ,GE1-350 ,Ecology ,QH540-549.5 - Abstract
Abstract Pluvial floods in urban areas are caused by local, fast storm events with very high rainfall rates, which lead to inundation of streets and buildings before the storm water reaches a watercourse. An increase in frequency and intensity of heavy rainfall events and an ongoing urbanization may further increase the risk of pluvial flooding in many urban areas. Currently, warnings for pluvial floods are mostly limited to information on rainfall intensities and durations over larger areas, which is often not detailed enough to effectively protect people and goods. We present a proof‐of‐concept for an impact‐based forecasting system for pluvial floods. Using a model chain consisting of a rainfall forecast, an inundation, a contaminant transport and a damage model, we are able to provide predictions for the expected rainfall, the inundated areas, spreading of potential contamination and the expected damage to residential buildings. We use a neural network‐based inundation model, which significantly reduces the computation time of the model chain. To demonstrate the feasibility, we perform a hindcast of a recent pluvial flood event in an urban area in Germany. The required spatio‐temporal accuracy of rainfall forecasts is still a major challenge, but our results show that reliable impact‐based warnings can be forecasts are available up to 5 min before the peak of an extreme rainfall event. Based on our results, we discuss how the outputs of the impact‐based forecast could be used to disseminate impact‐based early warnings.
- Published
- 2021
- Full Text
- View/download PDF
4. Multiple roles for hypoxia inducible factor 1-alpha in airway epithelial cells during mucormycosis
- Author
-
Povilas Kavaliauskas, Yiyou Gu, Naushaba Hasin, Karen T. Graf, Abdullah Alqarihi, Amol C. Shetty, Carrie McCracken, Thomas J. Walsh, Ashraf S. Ibrahim, and Vincent M. Bruno
- Subjects
Science - Abstract
Abstract During pulmonary mucormycosis, inhaled sporangiospores adhere to, germinate, and invade airway epithelial cells to establish infection. We provide evidence that HIF1α plays dual roles in airway epithelial cells during Mucorales infection. We observed an increase in HIF1α protein accumulation and increased expression of many known HIF1α-responsive genes during in vitro infection, indicating that HIF1α signaling is activated by Mucorales infection. Inhibition of HIF1α signaling led to a substantial decrease in the ability of R. delemar to invade cultured airway epithelial cells. Transcriptome analysis revealed that R. delemar infection induces the expression of many pro-inflammatory genes whose expression was significantly reduced by HIF1α inhibition. Importantly, pharmacological inhibition of HIF1α increased survival in a mouse model of pulmonary mucormycosis without reducing fungal burden. These results suggest that HIF1α plays two opposing roles during mucormycosis: one that facilitates the ability of Mucorales to invade the host cells and one that facilitates the ability of the host to mount an innate immune response.
- Published
- 2024
- Full Text
- View/download PDF
5. Correlating semiconductor nanoparticle architecture and applicability for the controlled encoding of luminescent polymer microparticles
- Author
-
Lena Scholtz, J. Gerrit Eckert, Rebecca T. Graf, Alexandra Kunst, K. David Wegner, Nadja C. Bigall, and Ute Resch-Genger
- Subjects
Medicine ,Science - Abstract
Abstract Luminophore stained micro- and nanobeads made from organic polymers like polystyrene (PS) are broadly used in the life and material sciences as luminescent reporters, for bead-based assays, sensor arrays, printable barcodes, security inks, and the calibration of fluorescence microscopes and flow cytometers. Initially mostly prepared with organic dyes, meanwhile luminescent core/shell nanoparticles (NPs) like spherical semiconductor quantum dots (QDs) are increasingly employed for bead encoding. This is related to their narrower emission spectra, tuneability of emission color, broad wavelength excitability, and better photostability. However, correlations between particle architecture, morphology, and photoluminescence (PL) of the luminescent nanocrystals used for encoding and the optical properties of the NP-stained beads have been rarely explored. This encouraged us to perform a screening study on the incorporation of different types of luminescent core/shell semiconductor nanocrystals into polymer microparticles (PMPs) by a radical-induced polymerization reaction. Nanocrystals explored include CdSe/CdS QDs of varying CdS shell thickness, a CdSe/ZnS core/shell QD, CdSe/CdS quantum rods (QRs), and CdSe/CdS nanoplatelets (NPLs). Thereby, we focused on the applicability of these NPs for the polymerization synthesis approach used and quantified the preservation of the initial NP luminescence. The spectroscopic characterization of the resulting PMPs revealed the successful staining of the PMPs with luminescent CdSe/CdS QDs and CdSe/CdS NPLs. In contrast, usage of CdSe/CdS QRs and CdSe QDs with a ZnS shell did not yield luminescent PMPs. The results of this study provide new insights into structure–property relationships between NP stained PMPs and the initial luminescent NPs applied for staining and underline the importance of such studies for the performance optimization of NP-stained beads.
- Published
- 2024
- Full Text
- View/download PDF
6. Synthesis of Porous Connected Cryoaerogel Networks from Cadmium Chalcogenide Nanoplatelet Stacks
- Author
-
Rebecca T. Graf, Denis Pluta, Adrian Hannebauer, Jakob Schlenkrich, and Nadja C. Bigall
- Subjects
aerogels ,cryogelation ,nanoplatelets ,self‐assembly ,stacking ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Cadmium chalcogenide nanoplatelets (NPLs) are not only known due to their unique optical properties but also because of their ability to self‐assemble into stacks with new collective properties. Only recently, a stacking process in an aqueous medium has been demonstrated, which opens up possible applications and methods such as gelation. Nanoparticle‐based aerogels gain a lot of attention due to their high relative surface areas and porosity and thus, high potential for catalytic applications. Herein, the positive properties of aerogels to the NPL‐stack system by cryoaerogelation of destabilized NPL dispersions are introduced. After the addition of an antisolvent to initiate the stacking, the dispersion is flash‐frozen with liquid nitrogen and freeze‐dried. By this method, porous cryoaerogel networks result in high surface areas and retained stacking of the NPLs. The formed stack‐gels are investigated by electron microscopy and physisorption measurements. Optical and photoelectrochemical measurements verify the charge carrier transport within the stack‐gel network.
- Published
- 2024
- Full Text
- View/download PDF
7. Semiconductor‐Metal Hybrid Nanoparticle‐Based Hydrogels: Efficient Photocatalysts for Hydrogen Evolution Reaction
- Author
-
Jakob Schlenkrich, Denis Pluta, Rebecca T. Graf, Christoph Wesemann, Franziska Lübkemann‐Warwas, and Nadja C. Bigall
- Subjects
charge carrier separation ,NP‐based hydrogels ,photocatalysis ,photocatalytic hydrogen production ,semiconductor–metal hybrid ,Physics ,QC1-999 ,Technology - Abstract
Abstract In semiconductor‐metal hybrid nanoparticles, excited charge carriers can be separated efficiently by transferring the electron to the metal, because the Fermi level is located within the bandgap of the semiconductor. Besides charge carrier separation, the catalytically active surface of the metal enables the use of these charge carriers for further reactions. Due to limited colloidal stability, the application of nanoparticles in solution is challenging. To circumvent these difficulties, the destabilization can be used to build monolithic 3D (non‐ordered) gel‐like structures with retained high surface area and an ensured diffusion within the network. Here, the resulting nanoparticle‐based hydrogels of CdSe/CdS/Pt nanoparticles show photocatalytic hydrogen production rates up to 58 (mmol(H2))/(g∙h). Due to the self‐supporting network structure, colloidal stability is unnecessary, and the applicability is improved. By simply mixing semiconductor and semiconductor–metal hybrid nanoparticles before gelation, the synthesis of the gels allows the reduction of the metal content, which further tunes the photocatalyst.
- Published
- 2024
- Full Text
- View/download PDF
8. Self‐Assembly of Semiconductor Nanoplatelets into Stacks Directly in Aqueous Solution
- Author
-
Rebecca T. Graf, Kevin Tran, Marina Rosebrock, Hadir Borg, Jakob Schlenkrich, Franziska Lübkemann‐Warwas, Franz Renz, Dirk Dorfs, and Nadja C. Bigall
- Subjects
aqueous media ,nanoplatelets ,stacking ,self‐assembly ,Physics ,QC1-999 ,Technology - Abstract
Abstract Since their discovery, cadmium chalcogenide nanoplatelets (NPLs) gained a lot of interest, not only due to their beneficial characteristic, but also because of their high affinity to self‐assemble into ordered stacks. Interestingly, the stacks showed both the properties of the single NPLs and new collective features, such as charge carrier transport within the stacks. Until now, the stacking was, to the best of the knowledge, only performed in non‐polar media mostly through the addition of antisolvents with higher polarity. Due to the fact, that many applications (e.g., photocatalysis) or procedures (such as gelation) occur in water, a route to self‐assemble stacks directly in aqueous solution is needed. In this work a new synthesis route is thus introduced to produce stacks directly in aqueous media. The NPLs are phase transferred with mercaptocarboxylic acids to an aqueous KOH solution followed by an addition of less polar antisolvents to initialize the stacking (e.g., tetrahydrofuran). Furthermore, a mechanism of the stacking as well as four possible driving forces involved in the process are proposed supported by transmission electron microscopy, dynamic light scattering, infrared spectroscopy, and x‐ray photoelectron spectroscopy measurements.
- Published
- 2023
- Full Text
- View/download PDF
9. Controlled Morphological Arrangement of Anisotropic Nanoparticles via Oxidation or Ionic Cross‐Linking
- Author
-
Marina Rosebrock, Rebecca T. Graf, Daniel Kranz, Hannah Christmann, Hannah Bronner, Adrian Hannebauer, Dániel Zámbó, Dirk Dorfs, and Nadja C. Bigall
- Subjects
aerogels ,fluorescence enhancements ,ionic gelations ,nanoparticles ,semiconductors ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
For a long time, researchers in nanochemistry have been exploring ways to create 3D structures using cross‐linked nanoparticles, such as lyogels and aerogels. In the present work, how simple modifications to the nanoparticle surface can be used to influence the resulting structure in a targeted manner is demonstrated. Specifically, positively charged surface ligands containing amine groups are compared to negatively charged ligands typically used, containing carboxylic acid groups, to generate network structures using different gelation agents. By utilizing bridging through S2− ions, a network structure of anisotropic CdSe/CdS nanorods is generated, packing them side by side at the nanoscopic level. The resulting structures exhibit improved fluorescence properties comparable to those of tip‐to‐tip connected networks but without harsh conditions for the nanoparticle surfaces. This innovative new method of gelation using S2− ions can achieve adequate photoluminescence quantum yields as well as prolonged fluorescence lifetimes compared to other network structures.
- Published
- 2023
- Full Text
- View/download PDF
10. Ultraprotective versus apneic ventilation in acute respiratory distress syndrome patients with extracorporeal membrane oxygenation: a physiological study
- Author
-
Peter T. Graf, Christoph Boesing, Isabel Brumm, Jonas Biehler, Kei Wieland Müller, Manfred Thiel, Paolo Pelosi, Patricia R. M. Rocco, Thomas Luecke, and Joerg Krebs
- Subjects
Acute respiratory distress syndrome ,Ventilator-induced lung injury ,Respiratory mechanics ,Respiratory function ,Mechanical ventilation ,Extracorporeal membrane oxygenation ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Abstract
Abstract Background Even an ultraprotective ventilation strategy in severe acute respiratory distress syndrome (ARDS) patients treated with extracorporeal membrane oxygenation (ECMO) might induce ventilator-induced lung injury and apneic ventilation with the sole application of positive end-expiratory pressure may, therefore, be an alternative ventilation strategy. We, therefore, compared the effects of ultraprotective ventilation with apneic ventilation on oxygenation, oxygen delivery, respiratory system mechanics, hemodynamics, strain, air distribution and recruitment of the lung parenchyma in ARDS patients with ECMO. Methods In a prospective, monocentric physiological study, 24 patients with severe ARDS managed with ECMO were ventilated using ultraprotective ventilation (tidal volume 3 ml/kg of predicted body weight) with a fraction of inspired oxygen (FiO2) of 21%, 50% and 90%. Patients were then treated with apneic ventilation with analogous FiO2. The primary endpoint was the effect of the ventilation strategy on oxygenation and oxygen delivery. The secondary endpoints were mechanical power, stress, regional air distribution, lung recruitment and the resulting strain, evaluated by chest computed tomography, associated with the application of PEEP (apneic ventilation) and/or low V T (ultraprotective ventilation). Results Protective ventilation, compared to apneic ventilation, improved oxygenation (arterial partial pressure of oxygen, p
- Published
- 2022
- Full Text
- View/download PDF
11. Effects of different positive end-expiratory pressure titration strategies during prone positioning in patients with acute respiratory distress syndrome: a prospective interventional study
- Author
-
Christoph Boesing, Peter T. Graf, Fabian Schmitt, Manfred Thiel, Paolo Pelosi, Patricia R. M. Rocco, Thomas Luecke, and Joerg Krebs
- Subjects
Acute respiratory distress syndrome ,Positive end-expiratory pressure ,Transpulmonary pressure ,Respiratory mechanics ,Prone position ,Ventilator-induced lung injury ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Abstract
Abstract Background Prone positioning in combination with the application of low tidal volume and adequate positive end-expiratory pressure (PEEP) improves survival in patients with moderate to severe acute respiratory distress syndrome (ARDS). However, the effects of PEEP on end-expiratory transpulmonary pressure (Ptpexp) during prone positioning require clarification. For this purpose, the effects of three different PEEP titration strategies on Ptpexp, respiratory mechanics, mechanical power, gas exchange, and hemodynamics were evaluated comparing supine and prone positioning. Methods In forty consecutive patients with moderate to severe ARDS protective ventilation with PEEP titrated according to three different titration strategies was evaluated during supine and prone positioning: (A) ARDS Network recommendations (PEEPARDSNetwork), (B) the lowest static elastance of the respiratory system (PEEPEstat,RS), and (C) targeting a positive Ptpexp (PEEPPtpexp). The primary endpoint was to analyze whether Ptpexp differed significantly according to PEEP titration strategy during supine and prone positioning. Results Ptpexp increased progressively with prone positioning compared with supine positioning as well as with PEEPEstat,RS and PEEPPtpexp compared with PEEPARDSNetwork (positioning effect p
- Published
- 2022
- Full Text
- View/download PDF
12. Tornadic Shear Stress Induces a Transient, Calcineurin-Dependent Hypervirulent Phenotype in Mucorales Molds
- Author
-
Sebastian Wurster, Alexander M. Tatara, Nathaniel D. Albert, Ashraf S. Ibrahim, Joseph Heitman, Soo Chan Lee, Amol C. Shetty, Carrie McCracken, Karen T. Graf, Antonios G. Mikos, Vincent M. Bruno, and Dimitrios P. Kontoyiannis
- Subjects
mucormycosis ,virulence ,mechanobiology ,trauma ,stress response ,Microbiology ,QR1-502 - Abstract
ABSTRACT Trauma-related necrotizing myocutaneous mucormycosis (NMM) has a high morbidity and mortality in victims of combat-related injuries, geometeorological disasters, and severe burns. Inspired by the observation that several recent clusters of NMM have been associated with extreme mechanical forces (e.g., during tornados), we studied the impact of mechanical stress on Mucoralean biology and virulence in a Drosophila melanogaster infection model. In contrast to other experimental procedures to exert mechanical stress, tornadic shear challenge (TSC) by magnetic stirring induced a hypervirulent phenotype in several clinically relevant Mucorales species but not in Aspergillus or Fusarium. Whereas fungal growth rates, morphogenesis, and susceptibility to noxious environments or phagocytes were not altered by TSC, soluble factors released in the supernatant of shear-challenged R. arrhizus spores rendered static spores hypervirulent. Consistent with a rapid decay of TSC-induced hypervirulence, minimal transcriptional changes were revealed by comparative RNA sequencing analysis of static and shear-challenged Rhizopus arrhizus. However, inhibition of the calcineurin/heat shock protein 90 (hsp90) stress response circuitry by cyclosporine and tanespimycin abrogated the increased pathogenicity of R. arrhizus spores following TSC. Similarly, calcineurin loss-of-function mutants of Mucor circinelloides displayed no increased virulence capacity in flies after undergoing TSC. Collectively, these results establish that TSC induces hypervirulence specifically in Mucorales and point out the calcineurin/hsp90 pathway as a key orchestrator of this phenotype. Our findings invite future studies of topical calcineurin inhibitor treatment of wounds as an adjunct mitigation strategy for NMM following high-energy trauma. IMPORTANCE Given the limited efficacy of current medical treatments in trauma-related necrotizing mucormycosis, there is a dire need to better understand the Mucoralean pathophysiology in order to develop novel strategies to counteract fungal tissue invasion following severe trauma. Here, we describe that tornadic shear stress challenge transiently induces a hypervirulent phenotype in various pathogenic Mucorales species but not in other molds known to cause wound infections. Pharmacological and genetic inhibition of calcineurin signaling abrogated hypervirulence in shear stress-challenged Mucorales, encouraging further evaluation of (topical) calcineurin inhibitors to improve therapeutic outcomes of NMM after combat-related blast injuries or violent storms.
- Published
- 2020
- Full Text
- View/download PDF
13. Common Analysis of Direct RNA SequencinG CUrrently Leads to Misidentification of 5-Methylcytosine Modifications at GCU Motifs
- Author
-
Kaylee J. Watson, Robin E. Bromley, Benjamin C. Sparklin, Mark T. Gasser, Tamanash Bhattacharya, Jarrett F. Lebov, Tyonna Tyson, Laura E. Teigen, Karen T. Graf, Michelle Michalski, Vincent M. Bruno, Amelia R. I. Lindsey, Richard W. Hardy, Irene L. G. Newton, and Julie C. Dunning Hotopp
- Subjects
Article - Abstract
RNA modifications, such as methylation, can be detected with Oxford Nanopore Technologies direct RNA sequencing. One commonly used tool for detecting 5-methylcytosine (m5C) modifications is Tombo, which uses an “Alternative Model” to detect putative modifications from a single sample. We examined direct RNA sequencing data from diverse taxa including virus, bacteria, fungi, and animals. The algorithm consistently identified a 5-methylcytosine at the central position of a GCU motif. However, it also identified a 5-methylcytosine in the same motif in fully unmodifiedin vitrotranscribed RNA, suggesting that this a frequent false prediction. In the absence of further validation, several published predictions of 5-methylcytosine in human coronavirus and human cerebral organoid RNA in a GCU context should be reconsidered.IMPORTANCEThe detection of chemical modifications to RNA is a rapidly expanding field within epigenetics. Nanopore sequencing technology provides an attractive means of detecting these modifications directly on the RNA, but accurate modification predictions are dependent upon the software developed to interpret the sequencing results. One of these tools, Tombo, allows users to detect modifications using sequencing results from a single RNA sample. However, we find that this method falsely predicts modifications in a specific sequence context across a variety of RNA samples, including RNA that lacks modifications. Results from previous publications include predictions in human coronaviruses with this sequence context and should be reconsidered. Our results highlight the importance of using RNA modification detection tools with caution in the absence of a control RNA sample for comparison.
- Published
- 2023
14. Depletion of Extracellular Chemokines by Aspergillus Melanin
- Author
-
Karen T. Graf, Hong Liu, Scott G. Filler, Vincent M. Bruno, and Latge, Jean-Paul
- Subjects
Spores ,Melanins ,Aspergillus fumigatus ,CXCL10 ,Inflammatory and immune system ,chemokines ,Microbiology ,melanin ,Fungal ,Rare Diseases ,Infectious Diseases ,Clinical Research ,Virology ,Humans ,Aspergillosis ,2.1 Biological and endogenous factors ,2.2 Factors relating to the physical environment ,airway epithelial cells ,Aetiology ,CCL20 ,Infection - Abstract
Aspergillus fumigatus is an environmental fungus that can cause life-threatening pulmonary disease. Infections initiate when conidia are inhaled and land deep inside the small airways and alveoli of the lungs, where they interact with epithelial cells. These cells provide a physical barrier and secrete chemokines to attract innate immune cells to the site of infection. Melanin, a key constituent of the conidial cell wall, is required for the establishment of invasive infection due to its ability to inhibit the function of innate immune cells recruited to clear the infection. Here, we provide evidence for an additional mechanism by which A. fumigatus can alter host innate immune responses. In vitro infection of a normal human small airway epithelial cell line (HSAEC1-KT) caused a decrease in extracellular protein levels of CXCL10 and CCL20, two proinflammatory chemokines that are required for the host defense against aspergillosis, despite a dramatic increase in the levels of each mRNA. A. fumigatus depleted recombinant human CXCL10 and CCL20 from medium in the absence of host cells, suggesting that the block in accumulation is downstream of protein translation and secretion. Melanin is both necessary and sufficient for this chemokine-depleting activity because a dihydroxynaphthalene (DHN)-melanin-deficient strain of A. fumigatus is defective in depleting chemokines and purified melanin ghosts retain potent depletion activity. We propose that A. fumigatus, through the action of melanin, depletes important chemokines, thereby dampening the innate immune response to promote infection. IMPORTANCE Aspergillus fumigatus is the major airborne fungal pathogen that affects humans. In order to cause an invasive infection, inhaled spores must avoid killing by innate immune cells that are recruited to the site of infection. Understanding how A. fumigatus achieves immune evasion is important for the development of novel therapeutics. We provide evidence that melanin, a pigment contained in the spore cell wall, can remove certain chemokines from the extracellular space to suppress the host inflammatory response that is responsible for clearing fungal infection.
- Published
- 2023
15. Investigation of the Photocatalytic Hydrogen Production of Semiconductor Nanocrystal‐Based Hydrogels
- Author
-
Jakob Schlenkrich, Franziska Lübkemann‐Warwas, Rebecca T. Graf, Christoph Wesemann, Larissa Schoske, Marina Rosebrock, Karen D. J. Hindricks, Peter Behrens, Detlef W. Bahnemann, Dirk Dorfs, and Nadja C. Bigall
- Subjects
Biomaterials ,General Materials Science ,General Chemistry ,Biotechnology - Published
- 2023
16. The author's program 'Natural Science Museum in the Life of a Modern School' as a way of realizing the culture-creating and pedagogical potential of natural science museums
- Author
-
E. Kirik, V. Aliyasova, and T. Graf
- Abstract
This article deals with the implementation by teachers of secondary schools of the culture-creating and pedagogical potential of natural science museums with the help of the author's program. At the moment, there is a situation where society needs a holistic and informative potential of the museum. Modern education in the educational process is increasingly based on a number of museum disciplines. The museum, being a socio-cultural institution, directly influences the solution of crisis situations of civilization in the XXI century. It should be noted that the pedagogical position put forward by the authors on the potential of natural science museums, reflected in this article, is relevant not only for our country, but also for the whole world affected by globalization. The authors of the article, based on the findings of the study, compiled an author's program for teachers of secondary schools, in which they tried to reveal the main points on the implementation of the culture-creating and pedagogical potential of natural science museums.
- Published
- 2021
17. Inhibition of EGFR Signaling Protects from Mucormycosis
- Author
-
Tonya N. Watkins, Teclegiorgis Gebremariam, Marc Swidergall, Amol C. Shetty, Karen T. Graf, Abdullah Alqarihi, Sondus Alkhazraji, Abrar I. Alsaadi, Vonetta L. Edwards, Scott G. Filler, Ashraf S. Ibrahim, and Vincent M. Bruno
- Subjects
EGFR ,gefitinib ,Rhizopus ,mucormycosis ,Microbiology ,QR1-502 - Abstract
ABSTRACT Mucormycosis is a life-threatening, invasive fungal infection that is caused by various species belonging to the order Mucorales. Rhizopus species are the most common cause of the disease, responsible for approximately 70% of all cases of mucormycosis. During pulmonary mucormycosis, inhaled Rhizopus spores must adhere to and invade airway epithelial cells in order to establish infection. The molecular mechanisms that govern this interaction are poorly understood. We performed an unbiased survey of the host transcriptional response during early stages of Rhizopus arrhizus var. delemar (R. delemar) infection in a murine model of pulmonary mucormycosis using transcriptome sequencing (RNA-seq). Network analysis revealed activation of the host’s epidermal growth factor receptor (EGFR) signaling. Consistent with the RNA-seq results, EGFR became phosphorylated upon in vitro infection of human alveolar epithelial cells with several members of the Mucorales, and this phosphorylated, activated form of EGFR colocalized with R. delemar spores. Inhibition of EGFR signaling with cetuximab or gefitinib, specific FDA-approved inhibitors of EGFR, significantly reduced the ability of R. delemar to invade and damage airway epithelial cells. Furthermore, gefitinib treatment significantly prolonged survival of mice with pulmonary mucormycosis, reduced tissue fungal burden, and attenuated the activation of EGFR in response to pulmonary mucormycosis. These results indicate EGFR represents a novel host target to block invasion of alveolar epithelial cells by R. delemar, and inhibition of EGFR signaling provides a novel approach for treating mucormycosis by repurposing an FDA-approved drug. IMPORTANCE Mucormycosis is an increasingly common, highly lethal fungal infection with very limited treatment options. Using a combination of in vivo animal models, transcriptomics, cell biology, and pharmacological approaches, we have demonstrated that Mucorales fungi activate EGFR signaling to induce fungal uptake into airway epithelial cells. Inhibition of EGFR signaling with existing FDA-approved drugs significantly increased survival following R. arrhizus var. delemar infection in mice. This study enhances our understanding of how Mucorales fungi invade host cells during the establishment of pulmonary mucormycosis and provides a proof-of-concept for the repurposing of FDA-approved drugs that target EGFR function.
- Published
- 2018
- Full Text
- View/download PDF
18. Use of mechanical circulatory support in patients with non-ischemic cardiogenic shock
- Author
-
B Schrage, J Sundermeyer, S Blankenberg, T Graf, P Kirchhof, P Luedike, P Nordbeck, A Proudfoot, M Orban, C Skurk, G Tavazzi, H Thiele, E B Winzer, R Westenfeld, and D Westermann
- Subjects
Cardiology and Cardiovascular Medicine - Abstract
Background The aim of this study was to evaluate mechanical circulatory support (MCS) for the treatment of non-ischemic cardiogenic shock (CS). Methods Data from 1,030 consecutive patients with non-ischemic CS treated with or without MCS at 16 tertiary-care centers were retrospectively collected. The association between MCS and 30-day mortality was assessed in a 1:1 propensity score matched cohort. Results MCS was used in 406 (39%) patients. MCS treated patients presented with more severe CS (lactate 5.4 vs. 4.1 mmol/l, systolic blood pressure 80 vs. 83 mmHg, higher SCAI class) and with more disease modifiers (prior cardiac arrest 42.4 vs. 36.1%, mechanical ventilation 78.4 vs. 56.5%). After matching, 272 patients treated with were compared vs. 272 patients treated without MCS. MCS was associated with a lower 30-day mortality (hazard ratio 0.77, 95% confidence interval 0.60–0.98, Figure 1). This finding was consistent through all tested sub-groups except when ejection fraction was considered, indicating an association especially in patients with an ejection fraction ≤20%. Complications occurred more frequently in patients with MCS; e.g. severe bleedings (21.8 vs. 9.2%) and access-site related ischemia (6.6 vs. 0%). Conclusion In patients with non-ischemic CS, MCS use was associated with lower 30-day mortality as compared to medical therapy only, particularly in patients with a lower ejection fraction. This provides rationale for randomized trials to validate these findings. Funding Acknowledgement Type of funding sources: None.
- Published
- 2022
19. Laser excitation of the 1s-hyperfine transition in muonic hydrogen
- Author
-
Pedro Amaro, A. Adamczak, M. Abdou Ahmed, L. Affolter, F. D. Amaro, Patricia Carvalho, T. -L. Chen, L. M. P. Fernandes, M. Ferro, D. Goeldi, T. Graf, M. Guerra, Theodor Hänsch, C. A. O. Henriques, Y. -C. Huang, P. Indelicato, O. Kara, Klaus Kirch, Andreas Knecht, Franz Kottmann, Y. -W. Liu, Jorge Machado, M. Marszalek, R. D. P. Mano, C. M. B. Monteiro, F. Nez, J. Nuber, A. Ouf, N. Paul, Randolf Pohl, E. Rapisarda, J. M. F. dos Santos, J. P. Santos, P. A. O. C. Silva, L. Sinkunaite, J. -T. Shy, K. Schuhmann, S. Rajamohanan, Anna Soter, L. Sustelo, David Taqqu, L. -B. Wang, Frederik Wauters, P. Yzombard, M. Zeyen, Aldo Antognini, École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)
- Subjects
Atomic Physics (physics.atom-ph) ,FOS: Physical sciences ,General Physics and Astronomy ,Physics::Atomic Physics ,[PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] ,Physics - Atomic Physics - Abstract
The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ($\mu$p) with 1 ppm accuracy by means of pulsed laser spectroscopy to determine the two-photon-exchange contribution with $2\times10^{-4}$ relative accuracy. In the proposed experiment, the $\mu$p atom undergoes a laser excitation from the singlet hyperfine state to the triplet hyperfine state, {then} is quenched back to the singlet state by an inelastic collision with a H$_2$ molecule. The resulting increase of kinetic energy after the collisional deexcitation is used as a signature of a successful laser transition between hyperfine states. In this paper, we calculate the combined probability that a $\mu$p atom initially in the singlet hyperfine state undergoes a laser excitation to the triplet state followed by a collisional-induced deexcitation back to the singlet state. This combined probability has been computed using the optical Bloch equations including the inelastic and elastic collisions. Omitting the decoherence effects caused by {the laser bandwidth and }collisions would overestimate the transition probability by more than a factor of two in the experimental conditions. Moreover, we also account for Doppler effects and provide the matrix element, the saturation fluence, the elastic and inelastic collision rates for the singlet and triplet states, and the resonance linewidth. This calculation thus quantifies one of the key unknowns of the HFS experiment, leading to a precise definition of the requirements for the laser system and to an optimization of the hydrogen gas target where $\mu$p is formed and the laser spectroscopy will occur., Comment: 21 pages, 4 figures
- Published
- 2022
20. Femtosecond X-ray diffraction from two-dimensional protein crystals
- Author
-
Matthias Frank, David B. Carlson, Mark S. Hunter, Garth J. Williams, Marc Messerschmidt, Nadia A. Zatsepin, Anton Barty, W. Henry Benner, Kaiqin Chu, Alexander T. Graf, Stefan P. Hau-Riege, Richard A. Kirian, Celestino Padeste, Tommaso Pardini, Bill Pedrini, Brent Segelke, M. Marvin Seibert, John C. H. Spence, Ching-Ju Tsai, Stephen M. Lane, Xiao-Dan Li, Gebhard Schertler, Sebastien Boutet, Matthew Coleman, and James E. Evans
- Subjects
two-dimensional protein crystal ,femtosecond crystallography ,single layer X-ray diffraction ,membrane protein ,Crystallography ,QD901-999 - Abstract
X-ray diffraction patterns from two-dimensional (2-D) protein crystals obtained using femtosecond X-ray pulses from an X-ray free-electron laser (XFEL) are presented. To date, it has not been possible to acquire transmission X-ray diffraction patterns from individual 2-D protein crystals due to radiation damage. However, the intense and ultrafast pulses generated by an XFEL permit a new method of collecting diffraction data before the sample is destroyed. Utilizing a diffract-before-destroy approach at the Linac Coherent Light Source, Bragg diffraction was acquired to better than 8.5 Å resolution for two different 2-D protein crystal samples each less than 10 nm thick and maintained at room temperature. These proof-of-principle results show promise for structural analysis of both soluble and membrane proteins arranged as 2-D crystals without requiring cryogenic conditions or the formation of three-dimensional crystals.
- Published
- 2014
- Full Text
- View/download PDF
21. Analysis on the influence of vapor capillary aspect ratio on pore formation in laser beam welding of aluminum
- Author
-
M. Hummel, C. Hagenlocher, A. Haeusler, S. Hollatz, J. Lind, A. Olowinsky, A. Gillner, F. Beckmann, J. Moosmann, R. Weber, T. Graf, and C. Häfner
- Subjects
Modeling and Simulation ,Metals and Alloys ,Ceramics and Composites ,Industrial and Manufacturing Engineering ,Computer Science Applications - Published
- 2023
22. CdS crown growth on CdSe nanoplatelets: core shape matters
- Author
-
Anja Schlosser, Rebecca T. Graf, and Nadja C. Bigall
- Subjects
PL quantum yield ,Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie ,Photoluminescence ,Pl spectroscopy ,Materials science ,Chalcogenide ,Growth kinetics ,High resolution transmission electron microscopy ,Bioengineering ,02 engineering and technology ,Cadmium sulfide ,010402 general chemistry ,01 natural sciences ,Selenium compounds ,chemistry.chemical_compound ,Lateral extension ,Particle domains ,General Materials Science ,Cadmium chalcogenides ,Lighting applications ,Optical properties ,business.industry ,General Engineering ,Optical features ,II-VI semiconductors ,General Chemistry ,Optimised conditions ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Core (optical fiber) ,chemistry ,Transmission electron microscopy ,Electronic properties ,ddc:540 ,Optoelectronics ,Particle ,Optical emitter ,0210 nano-technology ,business - Abstract
Cadmium chalcogenide nanoplatelets (NPLs) have gained tremendous attention in the past decade due to their extremely narrow optical features and their special electronic properties. For the application of the NPLs as optical emitters, in (photo) catalysis or sensing, further modification of the pristine (core) NPLs can be required. Therefore, many procedures for the synthesis of crowns (lateral extension of the core NPLs), shells and particle domains on the NPLs have already been developed. CdSe/CdS core/crown NPLs are characterised by extremely short photoluminescence (PL) lifetimes and high PL quantum yields (PLQYs) and might therefore be ideal candidates for lighting applications. In this work, we show how the optical properties of CdSe/CdS core/crown NPLs, especially their PLQYs, can be strongly improved by applying a sulphur precursor with a low reactivity. Under optimised conditions, the new procedure allows the growth of uniform CdS crowns around CdSe core NPLs with various lateral sizes, thicknesses and shapes. In addition, the modified growth kinetics was investigated by various methods, including UV/vis and PL spectroscopy as well as transmission electron microscopy. This journal is © The Royal Society of Chemistry.
- Published
- 2020
23. Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks
- Author
-
Rebecca T. Graf, Anja Schlosser, Dániel Zámbó, Jakob Schlenkrich, Pascal Rusch, Atasi Chatterjee, Herbert Pfnür, and Nadja C. Bigall
- Subjects
Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie ,nanoplatelets ,photo-electrochemistry ,self-assembly ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Biomaterials ,stacks ,ligand exchange ,distance variation ,charge carrier transport ,ddc:540 ,Electrochemistry - Abstract
In the large field of research on nanoplatelets (NPLs), their strong tendency to self-assemble into ordered stacks and the resulting changes in their properties are of great interest. The assembly reveals new characteristics such as the charge carrier transport through the NPL assembly or altered optical properties. In particular, a reduced distance should enhance the charge carrier transport due to higher electronic coupling of neighboring NPLs, and therefore, is the focus of this work. To modify the inter-particle distances, the straightforward method of ligand exchange is applied. Various CdSe and CdSe/CdX (hetero-) NPLs serve as building blocks, which not only display different material combinations but also different types of hetero-structures. The surface-to-surface distance between the stacked NPLs can be reduced to below 1 nm, thus, to less than the half compared to assemblies of pristine NPLs. Moreover, for certain NPLs stacking is only enabled by the ligand exchange. To characterize the ligand exchanges and to investigate the influences of the reduced distances, photo-electrochemical measurements, fluorescence spectroscopy, energy dispersive X-ray spectroscopy, nuclear magnetic resonance, and X-ray photoelectron spectroscopy are performed. It is possible to show higher photocurrents for smaller distances, indicating enhanced charge transport ability within those stacks.
- Published
- 2022
24. 10.1002/admi.202200055
- Author
-
Anja Schlosser, Jakob Schlenkrich, Dániel Zámbó, Marina Rosebrock, Rebecca T. Graf, Giamper Escobar Cano, Nadja C. Bigall
- Published
- 2022
- Full Text
- View/download PDF
25. Morphological Control Over Gel Structures of Mixed Semiconductor‐Metal Nanoparticle Gel Networks with Multivalent Cations
- Author
-
Marina Rosebrock, Dániel Zámbó, Pascal Rusch, Rebecca T. Graf, Denis Pluta, Hadir Borg, Dirk Dorfs, and Nadja C. Bigall
- Subjects
Biomaterials ,General Materials Science ,General Chemistry ,Biotechnology - Published
- 2023
26. Export of MPLS Segment Routing Label Type Information in IP Flow Information Export (IPFIX)
- Author
-
T. Graf
- Published
- 2021
27. Visualizing Saline Intrusion in a Three-Dimensional, Heterogeneous, Coastal Aquifer.
- Author
-
Marc Walther, Lars Bilke, Jens-Olaf Delfs, T. Graf, Jens Grundmann, Olaf Kolditz, and Rudolf Liedl
- Published
- 2013
- Full Text
- View/download PDF
28. Einfluss des Lockdowns während der ersten Welle der COVID-19-Pandemie auf die Inzidenz von gastrointestinalen Blutungen (GI-Blutungen)
- Author
-
M Kraus, MM Kirstein, JU Marquardt, T. Graf, Y. Hatem, C Engelke, C Maaß, T. Ewers, and S. Wolfrum
- Published
- 2021
29. Dynamic time warping comb filter for the enhancement of speech degraded by white Gaussian noise.
- Author
-
Joseph T. Graf and Nancy Hubing
- Published
- 1993
- Full Text
- View/download PDF
30. Papillary renal cell carcinoma in contrast-enhanced ultrasound (CEUS) – A diagnostic performance study
- Author
-
Dirk A. Clevert, K. Mueller-Peltzer, Johannes Rübenthaler, T. Graf, and G. Negrão de Figueiredo
- Subjects
Adult ,Male ,medicine.medical_specialty ,Physiology ,Contrast Media ,Chromophobe cell ,030204 cardiovascular system & hematology ,030218 nuclear medicine & medical imaging ,Lesion ,03 medical and health sciences ,0302 clinical medicine ,Renal cell carcinoma ,Physiology (medical) ,medicine ,Humans ,Cyst ,Carcinoma, Renal Cell ,Aged ,Retrospective Studies ,Ultrasonography ,Aged, 80 and over ,Papillary renal cell carcinomas ,business.industry ,Ultrasound ,Hematology ,Middle Aged ,medicine.disease ,Kidney Neoplasms ,Female ,Radiology ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,business ,Clear cell ,Contrast-enhanced ultrasound - Abstract
Background Renal cell carcinomas (RCC) represent a heterogeneous group of hypo- and hypervascularized malignancies. Using contrast-enhanced ultrasound (CEUS) specific imaging features of clear cell (ccRCC), papillary (pRCC) and chromophobe RCC (chRCC) subtypes have been demonstrated. However, some RCCs show atypical imaging features making it difficult to distinguish between the subtypes. Objective This study was performed to evaluate the observed enhancement features of pRCC in CEUS and to assess the sensitivity in the diagnosis of suspected renal malignancies in a 10 year retrospective analysis at our institution. Methods The study population consisted of 60 patients with histologically confirmed pRCC. All patients underwent CEUS imaging between 2005 and 2015 as part of their diagnostic workup. Results In 45 out of 60 (75%) cases the examined pRCC showed typical hypoenhancement and wash-out. 15 out of 60 (25%) pRCC showed atypical enhancement features; in 14 cases the contrast enhancement indicated a ccRCC. 1 complex cyst was falsely reported as IIF lesion. 59 out of 60 malignancies were reported as malignant using CEUS resulting in a sensitivity of 98.4%. Conclusions CEUS is an eligible imaging technique to visualize the contrast enhancement features of pRCC. However, up to 25% of pRCCs show an atypical enhancement pattern making it difficult to distinguish it from other renal lesions.
- Published
- 2019
31. A new approach for predicting the water balance of hops
- Author
-
T. Graf, D. Ismann, U. Schmidhalter, M. Beck, A. Baumgartner, M. Maier, M. Mauermeier, and J. Portner
- Subjects
Water balance ,Environmental engineering ,Environmental science ,Horticulture - Published
- 2019
32. Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks (Adv. Funct. Mater. 24/2022)
- Author
-
Rebecca T. Graf, Anja Schlosser, Dániel Zámbó, Jakob Schlenkrich, Pascal Rusch, Atasi Chatterjee, Herbert Pfnür, and Nadja C. Bigall
- Subjects
Biomaterials ,Electrochemistry ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2022
33. One‐Step Formation of Hybrid Nanocrystal Gels : Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks
- Author
-
Pascal Rusch, Armin Feldhoff, Dániel Zámbó, Anja Schlosser, Rebecca T. Graf, Patrick A. Kißling, and Nadja C. Bigall
- Subjects
Materials science ,Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung ,Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau ,One-Step ,02 engineering and technology ,charge carrier separation ,hybrid nanostructures ,010402 general chemistry ,01 natural sciences ,Metal ,ddc:670 ,semiconductor nanorod ,metal domain ,Dewey Decimal Classification::500 | Naturwissenschaften ,semiconductor nanoplatelets ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Nanocrystal ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Nanorod ,ddc:500 ,gel networks ,ddc:620 ,0210 nano-technology ,Deposition (chemistry) - Abstract
Hybrid semiconductor-based nanocrystals (NCs) are generally synthesized in organic media prior to their assembly into catalytically promising nanostructures via multistep methods. Here, a tunable, easy-to-adapt and versatile approach for the preparation of hybrid nanoparticle networks from aqueous nanocrystal solutions is demonstrated. The networks consist of interconnected semiconductor NC backbones (made of CdSe/CdS dot-in-rods or core/crown nanoplatelets) decorated with noble metal (Au and Pt) or with metal-based domains (Co2+ and Ni2+) demonstrating a powerful synthetic control over a variety of hybrid nanostructures. The deposition of the domains and the formation of the network take place simultaneously (one-step method) at room temperature in dark conditions without any external trigger. Beside the in-depth structural characterization of the gel-like hybrid networks, the wavelength-dependent optical features are studied to reveal an efficient charge carrier separation in the systems and a controllable extent of fluorescence quenching through the domain sizes. Photoluminescence quantum yields and decay dynamics highlight the importance of fine-tuning the conduction band/Fermi level offset between the semiconductors and the various deposited metals playing central role in the electron–hole separation processes. This procedure provides a novel platform toward the preparation of photo(electro)catalytically promising hybrid nanostructures (acetogels and xerogels) without the need of presynthetic hybrid particle design.
- Published
- 2021
34. Tornadic Shear Stress Induces a Transient, Calcineurin-Dependent Hypervirulent Phenotype in Mucorales Molds
- Author
-
Amol C. Shetty, Karen T. Graf, Dimitrios P. Kontoyiannis, Carrie McCracken, Sebastian Wurster, Alexander M. Tatara, Antonios G. Mikos, Ashraf S. Ibrahim, Nathaniel D. Albert, Joseph Heitman, Vincent M. Bruno, and Soo Chan Lee
- Subjects
Mucorales ,Morphogenesis ,Virulence ,mucormycosis ,Microbiology ,Host-Microbe Biology ,03 medical and health sciences ,Fusarium ,Virology ,Heat shock protein ,medicine ,Animals ,Humans ,030304 developmental biology ,Aspergillus ,0303 health sciences ,biology ,030306 microbiology ,Calcineurin ,Mucormycosis ,stress response ,Spores, Fungal ,mechanobiology ,biology.organism_classification ,medicine.disease ,Phenotype ,Hsp90 ,QR1-502 ,virulence ,Drosophila melanogaster ,trauma ,A549 Cells ,biology.protein ,Female ,Stress, Mechanical ,Rhizopus oryzae ,Research Article - Abstract
Given the limited efficacy of current medical treatments in trauma-related necrotizing mucormycosis, there is a dire need to better understand the Mucoralean pathophysiology in order to develop novel strategies to counteract fungal tissue invasion following severe trauma. Here, we describe that tornadic shear stress challenge transiently induces a hypervirulent phenotype in various pathogenic Mucorales species but not in other molds known to cause wound infections. Pharmacological and genetic inhibition of calcineurin signaling abrogated hypervirulence in shear stress-challenged Mucorales, encouraging further evaluation of (topical) calcineurin inhibitors to improve therapeutic outcomes of NMM after combat-related blast injuries or violent storms., Trauma-related necrotizing myocutaneous mucormycosis (NMM) has a high morbidity and mortality in victims of combat-related injuries, geometeorological disasters, and severe burns. Inspired by the observation that several recent clusters of NMM have been associated with extreme mechanical forces (e.g., during tornados), we studied the impact of mechanical stress on Mucoralean biology and virulence in a Drosophila melanogaster infection model. In contrast to other experimental procedures to exert mechanical stress, tornadic shear challenge (TSC) by magnetic stirring induced a hypervirulent phenotype in several clinically relevant Mucorales species but not in Aspergillus or Fusarium. Whereas fungal growth rates, morphogenesis, and susceptibility to noxious environments or phagocytes were not altered by TSC, soluble factors released in the supernatant of shear-challenged R. arrhizus spores rendered static spores hypervirulent. Consistent with a rapid decay of TSC-induced hypervirulence, minimal transcriptional changes were revealed by comparative RNA sequencing analysis of static and shear-challenged Rhizopus arrhizus. However, inhibition of the calcineurin/heat shock protein 90 (hsp90) stress response circuitry by cyclosporine and tanespimycin abrogated the increased pathogenicity of R. arrhizus spores following TSC. Similarly, calcineurin loss-of-function mutants of Mucor circinelloides displayed no increased virulence capacity in flies after undergoing TSC. Collectively, these results establish that TSC induces hypervirulence specifically in Mucorales and point out the calcineurin/hsp90 pathway as a key orchestrator of this phenotype. Our findings invite future studies of topical calcineurin inhibitor treatment of wounds as an adjunct mitigation strategy for NMM following high-energy trauma.
- Published
- 2020
35. In-situ Beschreibung des Wurzelsystems von Hopfen und Mais über Freilegung am Bodenprofil
- Author
-
Margarita Himmelbauer, Monika Sobotik, Gernot Bodner, Andreas Bohner, Willibald Loiskandl, and T. Graf
- Subjects
mais ,Ecology (disciplines) ,Soil Science ,wurzelanatomie ,Biology ,maize ,bewässerung ,irrigation ,hopfen ,root anatomy ,Environmental sciences ,hops ,wurzelsystem ,Animal Science and Zoology ,GE1-350 ,root system ,Agronomy and Crop Science ,Humanities - Abstract
Zusammenfassung Im Rahmen der Tagung „Wurzel und Rhizosphäre: Ökophysiologie, Humushaushalt und Bodenmanagement” im September 2015 wurden Wurzelfreilegungen von Hopfen und Mais in Wolnzach (Bayern) durchgeführt. Das Hauptziel der Untersuchungen war, die Möglichkeiten und den Wert von Wurzelfreilegungen im Feld zu demonstrieren. Für die Hopfenfreilegungen konnten die sichtbaren oberirdischen Unterschiede auch durch die Bewurzelungsweise erklärt werden. Der Einfluss der Bewässerung auf das Wurzelwachstum wurde ebenfalls untersucht. Die schwächer entwickelten Hopfenpflanzen wiesen eine Wurzeltiefe von ca. 130 cm auf, während die Wurzeln der gut entwickelten Pflanzen bis in eine Tiefe von 370 cm verfolgt werden konnten. Weiters wurden Maispflanzen bei konservierender Bodenbearbeitung mit Direktsaat untersucht. Im Gegensatz zu anderen Standorten konnten mehr Sprosswurzeln und lange Seitenwurzeln bis in eine Bodentiefe von 140 cm gefunden werden.
- Published
- 2018
36. One‐Step Formation of Hybrid Nanocrystal Gels: Deposition of Metal Domains on CdSe/CdS Nanorod and Nanoplatelet Networks (Advanced Optical Materials 17/2021)
- Author
-
Anja Schlosser, Patrick A. Kißling, Rebecca T. Graf, Armin Feldhoff, Dániel Zámbó, Pascal Rusch, and Nadja C. Bigall
- Subjects
Metal ,Materials science ,Nanocrystal ,visual_art ,Optical materials ,visual_art.visual_art_medium ,Nanotechnology ,Nanorod ,One-Step ,Deposition (chemistry) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2021
37. Procollagen I and III as Prognostic Markers in Patients Treated with Extracorporeal Membrane Oxygenation: A Prospective Observational Study
- Author
-
Manfred Thiel, Joerg Krebs, Peter T. Graf, Christoph Boesing, and Thomas Luecke
- Subjects
medicine.medical_specialty ,ARDS ,procollagen I ,medicine.medical_treatment ,Gastroenterology ,Article ,law.invention ,law ,Internal medicine ,medicine ,Extracorporeal membrane oxygenation ,Prospective cohort study ,Lung ,Receiver operating characteristic ,business.industry ,General Medicine ,Odds ratio ,acute respiratory distress syndrome ,extracorporeal membrane oxygenation ,procollagen III ,medicine.disease ,Intensive care unit ,Procollagen peptidase ,surgical procedures, operative ,medicine.anatomical_structure ,Medicine ,business - Abstract
Background: Procollagen peptides have been associated with lung fibroproliferation and poor outcomes in patients with acute respiratory distress syndrome (ARDS). Therefore, serum procollagen concentrations might have prognostic value in ARDS patients treated with extracorporeal membrane oxygenation (ECMO). Methods: In a prospective cohort study, serum N-terminal procollagen I-peptide (PINP) and N-terminal procollagen III-peptide (PIIINP) concentrations in twenty-three consecutive patients with severe ARDS treated with ECMO were measured at the time of ECMO initiation and during the course of treatment. The predictive value of PINP and PIIINP at the time of ECMO initiation was tested with a univariable logistic regression and a receiver operating characteristic (ROC) curve analysis. Results: Thirteen patients survived to intensive care unit (ICU) discharge. Non-survivors had higher serum PINP and PIIINP concentrations at all points in time during the course of treatment. Serum PIIINP at the day of ECMO initiation showed an odds ratio of 1.37 (95% CI 1.10–1.89, p = 0.017) with an area under the receiver operating characteristic (ROC) curve (AUC) of 0.87 (95% CI 0.69–1.00, p = 0.0029) for death during the course of treatment. Conclusions: PINP and PIIINP concentrations differ between survivors and non-survivors in ARDS treated with ECMO. This exploratory hypothesis generating study suggests an association between PIIINP serum concentrations at ECMO initiation and an unfavorable clinical outcome.
- Published
- 2021
38. Protein and DNA-based assays as complementary tools for fish allergen detection*
- Author
-
T. Graf, C. Hilger, Annette Kuehn, and François Hentges
- Subjects
fish allergy ,Redfish ,Allergy ,Mackerel ,medicine.disease_cause ,Herring ,Allergen ,parvalbumin ,medicine ,Food science ,Carp ,General Environmental Science ,biology ,Allergen detection ,General Engineering ,DNA ,biology.organism_classification ,Molecular biology ,Trout ,PCR ,biology.protein ,General Earth and Planetary Sciences ,ELISA ,Tuna ,protein ,Parvalbumin ,Research Article - Abstract
Background: Fish is one of the most important, allergenic foods worldwide. Parvalbumin is the well characterized, major allergen in fish muscle. In this study, we developed a protein- and a DNA-based method for the sensitive detection and authentication of eight commonly consumed fishes in food and compared their applicability. Methods: Fish parvalbumins were purified. Polyclonal, anti-parvalbumin antibodies were raised in rabbits and mice. Protein extracts from food were analyzed by quantitative ELISA. Parvalbumin genes were cloned and sequenced for the design of parvalbumin gene-specific PCR-primers. DNA extracted from food was subjected to specific PCR. Results: Increasing parvalbumin contents were quantified by ELISA in fresh fish, in the order of tuna < mackerel < cod < salmon/trout < redfish < carp < herring. The parvalbumin content of processed fish was up to 67% lower than in fresh fish. In spiked food samples, 1 to 15 ppm fresh fish and 30 to 170 ppm processed fish were still detectable by ELISA. The eight fishes were identified by specific PCR using 0.2 to 10 ng fish DNA. PCRs detected still 3 ppm fresh fish and 30 to 150 ppm processed fish in spiked samples. Conclusions: Both the protein- and the DNA-based method have sufficient sensitivity to protect fish-allergic consumers. The ELISA allows allergen quantification, while the PCR identifies the fish present in the food. The detection limits of both methods vary depending on different factors. Both methods need to be carefully validated for each fish and fish product when used in detection assays.
- Published
- 2017
39. Hoch-intensives Kraft-/Ausdauertraining erhöht die antioxidative Kapazität im Muskel von BRCA Mutationsträgern (BIJOU-Studie)
- Author
-
Svw Schulz, S Andres, J Huober, Uwe Schumann, E Trájer, Jürgen M. Steinacker, T Graf, W Janni, F Ebner, Martina Zügel, and S Otto
- Published
- 2017
40. Darf der Physiotherapeut osteopathisch behandeln?
- Author
-
R. Jungbecker and T. Graf-Baumann
- Subjects
Complementary and Manual Therapy ,medicine.medical_specialty ,Rehabilitation ,Complementary and alternative medicine ,Sports medicine ,business.industry ,medicine.medical_treatment ,Orthopedic surgery ,medicine ,Physical therapy ,Physical Therapy, Sports Therapy and Rehabilitation ,business - Published
- 2016
41. Empfehlungen zum hämodynamischen Monitoring in der internistischen Intensivmedizin
- Author
-
U. Janssens, Marcus Hennersdorf, Michael Buerke, T. Graf, Markus Ferrari, G. Simonis, Malte Kelm, C. Jung, H. Ebelt, Holger Thiele, and J. Fuhrmann
- Subjects
Gynecology ,03 medical and health sciences ,medicine.medical_specialty ,0302 clinical medicine ,business.industry ,Medicine ,030208 emergency & critical care medicine ,030212 general & internal medicine ,Cardiology and Cardiovascular Medicine ,business - Abstract
Das hamodynamische Monitoring in der kardiovaskularen Intensivmedizin wird unterteilt in Komponenten des Basismonitorings und des erweiterten Monitorings. Unverzichtbares Basismonitoring ist die Kombination aus EKG, Korpertemperatur, Sauerstoffsattigung, nichtinvasivem Blutdruck, Urinproduktion und dem „klinischen Blick“, bestehend aus grundlicher klinischer Untersuchung und Anamnese. Das Basismonitoring kann mit einer Vielfalt differenzierter erweiterter Monitoringverfahren erganzt werden, die im Einzelfall fur den in der Anwendung Geubten extrem nutzlich sein konnen, aber, wenn undifferenziert eingesetzt, mehr schaden als helfen. Fur kritische Phasen der Akuttherapie auf der Intensivstation, insbesondere fur das Nichtansprechen auf etablierte Therapieformen mussen differenzierte Optionen erwogen werden. Hierzu werden in dieser Arbeit Empfehlungen abgegeben. Der bettseitige, moglichst zeitnah verfugbare Einsatz der Echokardiographie bzw. Sonographie ist das zentrale Modul in der Diagnostik, Uberwachung und Therapiesteuerung kritisch kranker Intensivpatienten und kann Volumenreagibilitat und hamodynamischen Unterstutzungsbedarf abschatzen. Die Ausbildung und Expertise in diesen Verfahren ist daher unverzichtbar und unterstreicht die zentrale Rolle des internistisch-kardiologisch ausgebildeten Intensivmediziners.
- Published
- 2016
42. Struktur der schmerzmedizinischen Versorgung in Deutschland
- Author
-
T. Graf-Baumann, Michael Schäfer, B. Arnold, T. H. Cegla, Johannes Horlemann, Joachim Nadstawek, Michael Schenk, H.-R. Casser, J. Henning, A. Willweber-Strumpf, Michael A. Überall, J. Ludwig, H. Kletzko, Klaus Längler, M. Pfingsten, Wolfgang Koppert, Silvia Maurer, Gerhard H. H. Müller-Schwefe, O. M. D. Emrich, F. Bock, Hermann A. Locher, H. Kayser, H. J. Laubenthal, P. Nilges, and Thomas R. Tölle
- Subjects
medicine.medical_specialty ,business.industry ,Pain medicine ,media_common.quotation_subject ,Chronic pain ,Commission ,medicine.disease ,03 medical and health sciences ,0302 clinical medicine ,Anesthesiology and Pain Medicine ,Pain Clinics ,030202 anesthesiology ,Family medicine ,Psychological pain ,medicine ,Professional association ,Quality (business) ,Neurology (clinical) ,Intersectoral Collaboration ,business ,030217 neurology & neurosurgery ,media_common - Abstract
On behalf of the Medical/Psychological Pain Associations, Pain Patients Alliance and the Professional Association of Pain Physicians and Psychologists, the Joint Commission of Professional Societies and Organizations for Quality in Pain Medicine, working in close collaboration with the respective presidents, has developed verifiable structural and process-related criteria for the classification of medical and psychological pain treatment facilities in Germany. Based on the established system of graded care in Germany and on existing qualifications, these criteria also argue for the introduction of a basic qualification in pain medicine. In addition to the first-ever comprehensive description of psychological pain facilities, the criteria presented can be used to classify five different levels of pain facilities, from basic pain management facilities, to specialized institutions, to the Centre for Interdisciplinary Pain Medicine. The recommendations offer binding and verifiable criteria for quality assurance in pain medicine and improved pain treatment.
- Published
- 2016
43. Inhibition of EGFR Signaling Protects from Mucormycosis
- Author
-
Abrar I. Alsaadi, Scott G. Filler, Vonetta L. Edwards, Ashraf S. Ibrahim, Marc Swidergall, Abdullah Alqarihi, Teclegiorgis Gebremariam, Karen T. Graf, Amol C. Shetty, Vincent M. Bruno, Tonya N. Watkins, Sondus Alkhazraji, Wheeler, Robert T, and Lorenz, Michael
- Subjects
0301 basic medicine ,Male ,gefitinib ,Cetuximab ,mucormycosis ,Transcriptome ,Mice ,2.1 Biological and endogenous factors ,Gene Regulatory Networks ,Epidermal growth factor receptor ,Aetiology ,Phosphorylation ,Lung ,Mice, Inbred ICR ,biology ,Inbred ICR ,QR1-502 ,3. Good health ,ErbB Receptors ,Infectious Diseases ,Host-Pathogen Interactions ,Respiratory ,Infection ,Sequence Analysis ,Rhizopus ,medicine.drug ,Biotechnology ,Research Article ,Signal Transduction ,Mucorales ,EGFR ,Microbiology ,03 medical and health sciences ,Gefitinib ,In vivo ,Virology ,medicine ,Animals ,Humans ,Rhizopus arrhizus ,Protein Kinase Inhibitors ,Sequence Analysis, RNA ,Animal ,Mucormycosis ,biology.organism_classification ,medicine.disease ,In vitro ,Disease Models, Animal ,030104 developmental biology ,A549 Cells ,Disease Models ,Cancer research ,biology.protein ,RNA - Abstract
Mucormycosis is a life-threatening, invasive fungal infection that is caused by various species belonging to the order Mucorales. Rhizopus species are the most common cause of the disease, responsible for approximately 70% of all cases of mucormycosis. During pulmonary mucormycosis, inhaled Rhizopus spores must adhere to and invade airway epithelial cells in order to establish infection. The molecular mechanisms that govern this interaction are poorly understood. We performed an unbiased survey of the host transcriptional response during early stages of Rhizopus arrhizus var. delemar (R. delemar) infection in a murine model of pulmonary mucormycosis using transcriptome sequencing (RNA-seq). Network analysis revealed activation of the host’s epidermal growth factor receptor (EGFR) signaling. Consistent with the RNA-seq results, EGFR became phosphorylated upon in vitro infection of human alveolar epithelial cells with several members of the Mucorales, and this phosphorylated, activated form of EGFR colocalized with R. delemar spores. Inhibition of EGFR signaling with cetuximab or gefitinib, specific FDA-approved inhibitors of EGFR, significantly reduced the ability of R. delemar to invade and damage airway epithelial cells. Furthermore, gefitinib treatment significantly prolonged survival of mice with pulmonary mucormycosis, reduced tissue fungal burden, and attenuated the activation of EGFR in response to pulmonary mucormycosis. These results indicate EGFR represents a novel host target to block invasion of alveolar epithelial cells by R. delemar, and inhibition of EGFR signaling provides a novel approach for treating mucormycosis by repurposing an FDA-approved drug., IMPORTANCE Mucormycosis is an increasingly common, highly lethal fungal infection with very limited treatment options. Using a combination of in vivo animal models, transcriptomics, cell biology, and pharmacological approaches, we have demonstrated that Mucorales fungi activate EGFR signaling to induce fungal uptake into airway epithelial cells. Inhibition of EGFR signaling with existing FDA-approved drugs significantly increased survival following R. arrhizus var. delemar infection in mice. This study enhances our understanding of how Mucorales fungi invade host cells during the establishment of pulmonary mucormycosis and provides a proof-of-concept for the repurposing of FDA-approved drugs that target EGFR function.
- Published
- 2018
44. Mechanische Unterstützung im kardiogenen Schock
- Author
-
T. Graf and H. Thiele
- Subjects
Gynecology ,medicine.medical_specialty ,business.industry ,medicine ,Cardiology and Cardiovascular Medicine ,business - Abstract
Der kardiogene Schock ist mit einer Mortalitat von bis zu 50 % weiterhin der schwerwiegendste prognoserelevante Faktor beim akuten Myokardinfarkt. In der Fruhphase dieser Erkrankung vor und nach fruher Revaskularisation spielt vor allem die hamodynamische Unterstutzung der Patienten eine Rolle. Die Katecholamintherapie mit Inotropika und Vasopressoren, aber auch die Erwagung mechanischer Unterstutzungssysteme wie intraaortaler Ballonpumpen (IABP), perkutaner linksventrikularer Unterstutzungssysteme und extrakorporaler Membranoxygenation (ECMO) sind hier wichtige Eckpunkte der Therapie. Die Anlage einer IABP ist aufgrund der aktuellen Datenlage nicht mehr generell zu empfehlen, aber die Datenlage zur Implantation perkutaner linksventrikularer Assist-Devices (LVAD) bei Patienten im kardiogenen Schock ist sehr limitiert und bedarf weiterer Untersuchung. Ein Vergleich von perkutanen LVAD-Systemen mit einer medikamentosen Standardtherapie in grosen randomisierten Studien ist bislang nicht erfolgt. Ein direkter Vergleich der verschiedenen mechanischen Unterstutzungssysteme untereinander existiert ebenfalls nicht. Aus diesen Grunden gibt es in den deutschen und internationalen Leitlinien derzeit nur eine Empfehlung fur Patienten im kardiogenen Schock, die refraktar gegenuber der medikamentosen Standardtherapie sind. Diese Ubersicht soll die Moglichkeiten der mechanischen Kreislaufunterstutzung im kardiogenen Schock beleuchten und die aktuelle (Leitlinien-)Empfehlungslage zur Anwendung der verschiedenen Systeme reflektieren.
- Published
- 2015
45. Randomized clinical trial of the i-gel™ and Magill tracheal tube or single-use ILMA™ and ILMA™ tracheal tube for blind intubation in anaesthetized patients with a predicted difficult airway
- Author
-
Maren Kleine-Brueggeney, Cédric Luyet, Lorenz Theiler, T. Graf, Natalie Urwyler, and Robert Greif
- Subjects
Adult ,Male ,Leak ,medicine.medical_specialty ,medicine.medical_treatment ,610 Medicine & health ,Anesthesia, General ,Tracheal tube ,Laryngeal Masks ,law.invention ,Young Adult ,Postoperative Complications ,Randomized controlled trial ,law ,medicine ,Intubation, Intratracheal ,Intubation ,Fiber Optic Technology ,Humans ,Prospective Studies ,Disposable Equipment ,Difficult airway ,Device Removal ,Aged ,Aged, 80 and over ,Single use ,business.industry ,Tracheal intubation ,Hemodynamics ,Pharyngitis ,Equipment Design ,respiratory system ,Middle Aged ,Surgery ,Anesthesiology and Pain Medicine ,Anesthesia ,Female ,business ,Airway - Abstract
Background The single-use supraglottic airway device i-gel™ has been described in several case reports as a conduit for intubation, but no prospective data about success rates of blind intubation are available. Therefore, we performed this prospective randomized controlled trial to compare the success rate of blind tracheal intubation with a Magill PVC tube through the i-gel™ with intubation using an sILMA™ PVC tube through the single-use intubating laryngeal mask airway (sILMA™). Methods With ethics committee approval and written informed consent, 80 patients with predictors of a difficult airway were computer randomized to either supraglottic airway device (SAD). The corresponding tracheal tube (TT) was introduced through the SAD under fibreoptic visualization but without fibreoptic guidance. Primary outcome was blind intubation success rate. Times, airway leak pressure, fibreoptic view, and adverse events were recorded. To control for the influence of the TT, we compared data from 40 patients described in an accompanying study (sILMA™ with Magill TT and i-gel™ with sILMA™ TT). Results Blind intubation success rate through the sILMA™ (69%) was higher than with the i-gel™ (15%, P
- Published
- 2017
46. [Cardiac support and replacement systems]
- Author
-
T, Graf and H, Thiele
- Subjects
Extracorporeal Membrane Oxygenation ,Treatment Outcome ,Shock, Cardiogenic ,Humans ,Heart-Assist Devices ,Heart Arrest - Abstract
In recent years, the widespread use of partial mechanical cardiac support and even temporary complete replacement of cardiac function has been established in many intensive care units in the treatment of refractory cardiogenic shock. There is a difference between partial left-ventricular assist devices (LVAD) and the possibility of complete heart (and lung) replacement by extra corporeal life support (ECLS). Despite the use of mechanical support devices, the mortality of cardiogenic shock remains high. The consideration of using percutaneous LVAD and ECLS in cardiogenic shock should be considered in refractory cardiogenic shock patients in addition to support by catecholamines and after early revascularization in acute coronary syndromes. However, there are no large randomized studies evaluating mechanical support systems with respect to outcome in cardiogenic shock patients. German and international guidelines do not recommend the routine use of mechanical support as a first-line treatment in cardiogenic shock patients and emphasize that their application should be restricted to patients with therapy refractory shock. In other cases of noninfarct-related cardiogenic shock (e. g., poisoning, myocarditis), ECLS use should be considered as bridging therapy. ECLS may also be considered in cardiopulmonary resuscitation which is termed E‑CPR. According to registry data, E‑CPR may reduce mortality in selected patients. A possible application of ECLS is severe accidental hypothermia with cardiac arrest despite limited data. In these rare cases, early ECLS should be considered for rewarming and stabilization.
- Published
- 2017
47. Asymptotic analysis of weakly nonlinear Bessel–Gauß beams
- Author
-
T. Graf, Jerome V. Moloney, and Shankar C. Venkataramani
- Subjects
Asymptotic analysis ,Ideal (set theory) ,Gaussian ,Mathematical analysis ,Statistical and Nonlinear Physics ,Conical surface ,Condensed Matter Physics ,symbols.namesake ,Nonlinear system ,Amplitude ,symbols ,Nonlinear Schrödinger equation ,Bessel function ,Mathematics - Abstract
In this paper we investigate the propagation of conical waves in nonlinear media. In particular, we are interested in the effects resulting from applying a Gaussian apodization to an ideal nondiffracting wave. First, we present a multiple scales approach to derive amplitude equations for weakly nonlinear conical waves from a governing equation of cubic nonlinear Schrodinger type. From these equations we obtain asymptotic solutions for the linear and the weakly nonlinear problem for which we state several uniform estimates that describe the deviation from the ideal nondiffracting solution. Moreover, we show numerical simulations based on an implementation of our amplitude equations to support and illustrate our analytical results.
- Published
- 2013
48. [Structure of pain management facilities in Germany : Classification of medical and psychological pain treatment services-Consensus of the Joint Commission of the Professional Societies and Organizations for Quality in Pain Medicine]
- Author
-
G H H, Müller-Schwefe, J, Nadstawek, T, Tölle, P, Nilges, M A, Überall, H J, Laubenthal, F, Bock, B, Arnold, H R, Casser, T H, Cegla, O M D, Emrich, T, Graf-Baumann, J, Henning, J, Horlemann, H, Kayser, H, Kletzko, W, Koppert, K H, Längler, H, Locher, J, Ludwig, S, Maurer, M, Pfingsten, M, Schäfer, M, Schenk, and A, Willweber-Strumpf
- Subjects
National Health Programs ,Quality Assurance, Health Care ,Germany ,Humans ,Pain Clinics ,Pain Management ,Interdisciplinary Communication ,Chronic Pain ,Intersectoral Collaboration - Abstract
On behalf of the Medical/Psychological Pain Associations, Pain Patients Alliance and the Professional Association of Pain Physicians and Psychologists, the Joint Commission of Professional Societies and Organizations for Quality in Pain Medicine, working in close collaboration with the respective presidents, has developed verifiable structural and process-related criteria for the classification of medical and psychological pain treatment facilities in Germany. Based on the established system of graded care in Germany and on existing qualifications, these criteria also argue for the introduction of a basic qualification in pain medicine. In addition to the first-ever comprehensive description of psychological pain facilities, the criteria presented can be used to classify five different levels of pain facilities, from basic pain management facilities, to specialized institutions, to the Centre for Interdisciplinary Pain Medicine. The recommendations offer binding and verifiable criteria for quality assurance in pain medicine and improved pain treatment.
- Published
- 2016
49. High Temperature Data Retention of Ferroelectric Memory on 130nm and 180nm CMOS
- Author
-
Theodore S. Moise, Huang-Chun Wen, T. Wang, Scott R. Summerfelt, M. Ball, John A. Rodriguez, K. R. Udayakumar, Tamer San, C. Zhou, R. Bailey, M. Wiegand, and T. Graf
- Subjects
010302 applied physics ,Materials science ,business.industry ,020208 electrical & electronic engineering ,02 engineering and technology ,01 natural sciences ,Temperature measurement ,Ferroelectricity ,Ferroelectric capacitor ,law.invention ,Non-volatile memory ,Capacitor ,CMOS ,law ,Soldering ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Optoelectronics ,Data retention ,business - Abstract
Systematic evaluation of ferroelectric memory (FRAM) data retention mechanisms under high temperature exposure are reported. The FRAM devices are embedded on ultra-low power, analog-enhanced 130nm and 180nm CMOS technologies. Capability of the FRAM to retain data through 260°C Pb-free solder assembly reflow is demonstrated. The 130nm FRAM is shown to achieve the equivalent of 10 years data retention at 125°C, with intrinsic margin comparable to the 180nm FRAM, previously shown to achieve 10 years at 125°C retention.
- Published
- 2016
50. Struktur der schmerzmedizinischen Versorgung in Deutschland: Klassifikation schmerzmedizinischer Einrichtungen
- Author
-
G.H.H. Müller-Schwefe, J. Nadstawek, T. Tölle, P. Nilges, M.A. Überall, H.J. Laubenthal, F. Bock, B. Arnold, H.R. Casser, T.H. Cegla, O.M.D. Emrich, T. Graf-Baumann, J. Henning, J. Horlemann, H. Kayser, H. Kletzko, W. Koppert, K.H. Längler, H. Locher, J. Ludwig, S. Maurer, M. Pfingsten, M. Schäfer, M. Schenk, and A. Willweber-Strumpf
- Published
- 2016
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.