8,886 results on '"Wang Lihong"'
Search Results
2. Alleviating adverse effects of environmental stress in plants through chitosan application
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Tahreem ARSHAD, Wang LIHONG, Hussam F. Najeeb ALAWADI, Athar MAHMOOD, Muhammad Anjum ZIA, Maria NAQVE, Basharat ALI, Muhammad NAWAZ, Muhammad Umair HASSAN, Abeer HASHEM, and Elsayed Fathi ABD_ALLAH
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chitosan ,environmental stresses ,defense response ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Chitosan encourages the growth of plants, controls their metabolic processes and homeostasis, and activates their defence mechanisms. On one side, it hinders the ability of pathogens by preventing their growth and limiting their reproduction, so it will become a more common and ideal asset for agricultural sustainability. Additionally, cesium (Cs) stimulated the SOS1 pathway and raised a number of gene transcripts related to energy generation, phenol metabolism, proton motive force, salt compartmentalization, and other processes. However, plants exposed to salt stress were treated with cesium nanoparticles (CsNPs) and modified CsBMs, which boosted indole terpene alkaloid metabolism, defense-related genes, decreased ROS formation by boosting jasmonic acid (JA) signalling, increased essential oil, anthocyanins, membrane stability, alkaloids, and diterpene glycosides. This is the first review that specifically compares Cs/CsNPs/modified CsBMs treatment options under salt stress and offers insights about the biological and biochemical parameters of the plants. It also recommends using CsNPs and modified CsBMs rather than Cs for better plant function under salinity stress.
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- 2024
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3. Battling arid adversity: unveiling the resilience of cotton in the face of drought and innovative mitigation approaches
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Ayesha BIBI, Wang LIHONG, Athar MAHMOOD, Muhammad M. JAVAID, Basharat ALI, Muhammad YASIN, Kashif KAMRAN, Bilal A. KHAN, Adnan RASHEED, Muhammad U. HASSAN, Abeer HASHEM, Mouna MECHRI, and Elsayed F. ABD_ALLAH
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Crisper/Cas gene ,drought stress ,fiber quality ,management strategies ,source sink relationship ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Climate change has had significant impacts on agriculture, particularly on cotton production, where drought has emerged as a major threat worldwide. Long and intense dry periods in cotton-growing regions have become more frequent and severe. Drought stress severely affects various aspects of cotton plants, including chlorophyll pigments, carbohydrate metabolism, and enzyme activities related to fiber development, such as vacuolar invertase and sucrose synthase. Furthermore, drought stress disrupts the movement of nutrients toward the reproductive tissues in cotton, resulting in compromised pollen function, propagative failure, and fiber characteristics. To tackle these issues, scientists have made advancements in creating drought-resistant cotton varieties through transgenic methods or molecular breeding techniques, genome editing, CRISPR/Cas9, utilizing quantitative trait loci (QTL). Moreover, the application of plant growth regulators and mineral elements has displayed the potential to improve cotton’s ability to endure drought stress while also enhancing fiber yield and quality. These approaches activate stress-responsive signaling pathways, which could contribute to mitigating reproductive failure and improving fiber characteristics. While the impact of drought stress on cotton plants has been extensively studied, the variations in fiber quality resulting from drought stress are not yet completely understood. Current research has been focused on unraveling the mechanisms underlying these changes, including the physiological, biochemical, and molecular alterations during the multiplicative growth phase that contribute to poor fiber development. Understanding these mechanisms will facilitate the development of novel strategies to alleviate the adverse impact of worldwide weather changes on cotton growth and fiber quality. This research focuses on the drought stress in cotton cultivation and explores its different effects on cotton morphology, physiology, crop yield, and fiber characteristics as well as mechanisms by which cotton exhibits drought tolerance and highlights innovative strategies to mitigate drought stress.
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- 2024
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4. Mitigating negative impact of salinity on berseem (Trifolium alexandrinum) by foliar application of salicylic acid
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Masood AHMAD, Maria NAQVE, Wang LIHONG, Muhammad A. ZIA, Athar MAHMOOD, Muhammad M. JAVAID, Muaz AMEEN, Afaf A. RASHED, Adnan RASHEED, Muhammad U. HASSAN, and Sameer H. QARI
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antioxidants ,growth regulator ,ionic stress ,SA ,salinity ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Salicylic acid (SA) is a plant growth regulator known to take part in defense responses against different types of stresses, including salt stress. In this study, the role of foliar applied SA in improving the growth of berseem variety ‘Anmol’ under salt stress was examined. Plants were sown in plastic pots in the sand. Plants were treated with different concentrations of salinity (0, 60 mM and 120 mM NaCl) and salicylic acid (0, 100 mg L-1 and 150 mg L-1) was applied as a foliar spray. Salinity stress significantly reduced root and shoot fresh and dry weight, root and shoot length, photosynthetic pigments including Chl. a, b, a/b, total soluble proteins, total amino acids and uptake of K+ and Ca2+ ions in root and shoot tissues. Exogenous application of salicylic acid improved growth traits including shoot length, shoot fresh weight, root length, root fresh and weight, shoot dry weight, pigments contents (Chl. a, a/b and carotenoids). Total soluble protein and amino acid contents, activities of antioxidants peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) were also enhanced by the foliar spray of SA under saline and non-saline conditions. SA played a crucial role in lowering Na+ and Cl− ions content in shoot and root tissues while enhancing the uptake of K+ and Ca2+ ions. The study revealed that 100 mg L-1 SA treatment significantly influenced several plant parameters, including shoot length (8 cm), root length 6.7 cm, chlorophyll (1.2 mg/g FW), total soluble proteins (0.8 mg/g FW) and total amino acids (2.5 mg/g FW), SOD (1.22 U/mg protein), CAT (1.75 U/mg FW), potassium ions (29 mg/g DW), and calcium ions (43 mg/g DW) during salinity stress. Therefore, field use of SA (100 mg L-1) is recommended to enhance the growth of berseem and other fodder crops in saline soils.
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- 2024
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5. Construction of Cybersecurity and Risk Prediction Model for New Energy Power Plants under Machine Learning Algorithm
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Sun Xiaofu, Wang Shengda, Liu Danni, Wang Lihong, and Lin Ziqing
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restricted boltzmann machine ,markov time-varying ,hybrid training ,network security ,risk prediction ,11a05 ,Mathematics ,QA1-939 - Abstract
Addressing the complex equipment and network challenges in new energy power plant industrial control systems, this study introduces a Markov time-varying machine learning algorithm, leveraging classification-constrained Boltzmann machines for real-time network security risk prediction. By employing a hybrid training mode for innovative feature extraction and classification, the algorithm forecasts future security risk states through an up-to-date state transition probability matrix. Integrating with the Markov time-varying model enhances the efficiency over traditional Boltzmann machines, facilitating nuanced network state analyses. The proposed model demonstrates high effectiveness against various network attacks, with average precision, recall, and F1 scores of 0.96, 0.93, and 0.94, respectively, and maintains over 80% accuracy under noise levels up to 40 dB. This research provides a solid foundation for proactive security defense mechanisms in industrial control systems.
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- 2024
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6. Biochar a promising amendment to mitigate the drought stress in plants: review and future prospective
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Wang LIHONG, Guan JIANING, Wei JIAN, Athar MAHMOOD, Adnan RASHEED, Muhammad U. HASSAN, Jameel M. AL-KHAYRI, Mohammed I. ALDAEJ, Muhammad N. SATTAR, Adel Abdel-Sabour REZK, Mustafa I. ALMAGHASLA, and Wael F. SHEHATA
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biochar ,drought stress ,hormones ,photosynthesis ,plant water relations ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Drought stress (DS) is one of the most destructive abiotic stresses that negatively affects plant growth, and yield. The intensity of DS is continuously increasing due rapid of water sources, less rainfall, and an increase in global warming. The world’s population is increasing at an alarming rate which needs a substantial increase in crop production to meet global food needs. Therefore, in this context, we must have to increase crop production in the scenarios of rapid climate change and increasing intensity of abiotic stresses. Globally, different measures are used to mitigate the adverse impacts of DS, recently biochar (BC) has emerged as an excellent soil amendment to mitigate the toxic effects of DS and improve crop production. The application maintains membrane integrity, plant water relations, nutrient homeostasis, photosynthetic performance, hormonal balance and osmolytes accumulation, and gene expression thereby improving plant performance under DS. Moreover, BC application under DS also improves soil organic matter, water holding capacity, soil structure stability, and activity of beneficial microbes which can improve the plant performance under DS. In the present review different mechanisms through which BC mitigates the adverse impacts of DS on plants are discussed. This review provides new suggestions on the role of BC in mitigating the adverse impacts of DS.
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- 2023
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7. The role of endophytes and rhizobacteria to combat drought stress in wheat
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Asif MUKHTIAR, Wang LIHONG, Athar MAHMOOD, Muaz AMEEN, Muhammad Anjum ZIA, Tahreem ARSHAD, Maria NAQVE, Hafiz A. WAHAB, Adnan RASHEED, Saima ASGHAR, Asma ZAFAR, and Muhammad U. HASSAN
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drought stress ,gene expression ,mitigation strategies ,molecular markers ,PGPR ,signaling ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Wheat production suffers greatly from drought stress, resulting in yield losses. Endophytes and rhizobacteria have been recognized as a valuable source in mitigating of drought stress by improving plant resistance and growth. In this review, we discuss how endophytes and rhizobacteria help wheat cope with drought stress. During drought stress, endophytes have been found to increase plant water usage efficiency and decrease water loss. Endophytes are harmless microorganisms that live inside plant tissues. Rhizobacteria establish colonies in the root system through various procedures, including phytohormones production, modification of root architecture, and activation of stress-inducible genes, thereby promoting plant growth and enhancing stress resistance. Numerous studies have shown how endophytes and rhizobacteria can improve the potential of wheat to withstand drought. For instance, inoculation with endophytes like Piriformospora indica and Bacillus spp. has been proven to enhance wheat plant yield and drought resistance. Similarly, it has been proven that rhizobacteria like Pseudomonas spp. and Azospirillum brasilense enhance drought tolerance through a variety of mechanisms. To minimize the consequence of wheat under drought conditions, the efficient method is the use of endophytes and rhizobacteria as biofertilizers, which could ultimately boost yields and sustainability. More research needs to be done so that it can be used most effectively in the field and so that we can better understand how they work. We explained current understanding of the role and mechanisms of endophytes and rhizobacteria in minimizing drought stress effects in wheat. Additionally, we highlighted areas of limited knowledge and suggested directions for future research. This review will provide the new suggestion on the role of endophytes and rhizobacteria in mitigating the drought stress in plants.
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- 2023
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8. Correlation between sperm DNA methylation level and semen quality among 73 college students in Chongqing, China
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WANG Lihong, HE Shijun, CHEN Qing, LING Xi, and SUN Lei
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sperm dna 5mc ,routine semen parameters ,sperm chromatin integrity ,correlation analysis ,Medicine (General) ,R5-920 - Abstract
Objective To investigate the association of sperm DNA methylation level with routine semen parameters and sperm chromatin integrity. Methods A total of 73 male individuals who were sampled from our previously established cohort of the male reproductive health in Chongqing college students (MARHCS) study were recruited in this study. The routine semen parameters (semen volume, sperm density, total sperm count and sperm motility) and indicators of sperm chromatin integrity were detected and analyzed with computer-aided sperm analysis system (CASA) and sperm chromatin structure analysis (SCSA), respectively. ELISA was used to detect the sperm DNA 5mC content, which reflected the methylation level of sperm DNA. Meanwhile, age, BMI, abstinence time and lifestyle of the volunteers were collected through questionnaire survey. Multiple linear regression model was applied to explore the correlation of sperm DNA 5mC content with routine semen parameters and sperm chromatin integrity. The differences in percentages of different grade of sperm were compared in the high and low 5mC% groups (binary classification according to the median value of 5mC%). Results The semen routine parameters (median value) of the volunteers were as follows: semen volume was 4.18 mL, sperm density was 55.60×106/mL, total sperm count was 246.93×106, and sperm motility was 57.00%; Sperm chromatin was in structural integrity, with a median value of sperm DNA fragmentation index (DFI) and high DNA stainablity (HDS) of 10.99% and 3.39%, respectively. The median value of sperm DNA 5mC level was 2.63%. After adjustment for confounding factors, multiple linear regression analysis showed that sperm DNA 5mC level was negatively correlated with sperm density (β=-0.22, 95%CI: -0.36~-0.06, P=0.008) and total sperm count (β=-0.20, 95%CI: -0.33~-0.05, P=0.015), but no statistical correlations were observed in sperm DNA 5mC level with DFI and HDS (P>0.05). Meanwhile, there were no significant differences in the percentages of different grade of sperm (grade A~D) in the high 5mC group than the low 5mC group (P>0.05). Conclusion Elevated sperm DNA methylation level may be a biomarker for the decrease of sperm density and total sperm count, while is not correlated with indicators of sperm chromatin integrity.
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- 2023
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9. 1-nitropyrene induces ovarian granulosa cell dysfunction through mitochondrial damage
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CUI Haonan, HE Shijun, WANG Lihong, YANG Wang, and YANG Binwei
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1-nitropyrene ,human ovarian granulosa cell line ,cycle arrest ,sex hormone ,mitochondria ,Medicine (General) ,R5-920 - Abstract
Objective To investigate the effect of 1-nitropyrene (1-NP) on the proliferation, cycle progression and sex hormone synthesis of human ovarian granulosa cell line KGN via inducing mitochondrial damage. Methods After KGN cells were treated with 1-NP at different concentrations (0.625, 1.25, 2.5, 5 and 10 μmol/L) for 48 h, cell proliferation, cell cycle, and contents of estradiol and pregnenolone in the supernatant were detected by EdU assay, flow cytometry and ELISA, respectively.And the levels of reactive oxygen species (ROS), mitochondrial superoxide (MitoSOX) and mitochondrial membrane potential were examined with specific fluorescent probes including DCFH-DA probe, MitoSOX probe and JC-1 probe, respectively.In addition, ATP kit was adopted to measure the cellular ATP level, and Western blotting was also conducted to determine the expression of proteins related with the cell proliferation, cycle progression, DNA damage response and synthesis of sex hormones.Finally, the mitochondrial antioxidant idebenone (IDE, 1 μmol/L) and 1-NP (10 μmol/L) were combined to treat the cells for 48 h, and then the above indicators were determined correspondingly again. Result As compared with the control cells, 1-NP (0.625~10 μmol/L) treatment significantly inhibited cell proliferation (P < 0.05).The expression of PCNA, a marker of cell proliferation, was reduced after treatment with 1-NP (2.5, 5 or 10 μmol/L), and the percentage of cells at G2/M phase was elevated at 5 and 10 μmol/L of 1-NP (P < 0.05).Western blotting showed that the expression of γ-H2AX began to rise after 1-NP treatment (10 μmol/L) for 3 h (P < 0.01), and the levels of DNA damage pathway proteins, p-ATM, p53 and p21cip1 were also obviously increased (P < 0.05), while those of G2/M phase block-related proteins, CDK-1 and CyclinB1, were notably decreased at different doses of 1-NP (P < 0.05).In addition, the contents of estradiol and pregnenolone in the supernatant of KGN cells were remarkably diminished after 1-NP treatment (P < 0.05), and the expression levels of sex hormone synthesis-related proteins CYP19 and CYP11A1 were inhibited as well (P < 0.05).The detection of mitochondrial and oxidative stress-related indicators indicated that the levels of ROS and MitoSOX in KGN cells were greatly up-regulated due to 1-NP treatment, while the mitochondrial membrane potential and ATP level were decreased in a dose-dependent manner.However, the combination of 1-NP and IDE significantly declined the percentage of G2/M-phase cells, elevated the contents of estradiol and pregnenolone, and restored the expression levels of proteins related to DNA damage, cell cycle as well as sex hormone synthesis when compared with the cells treated with 10 μmol/L 1-NP.Moreover, the combination treatment also ameliorated the mitochondrial damage induced by 1-NP, including lowering ROS and MitoSOX levels and improving the mitochondrial membrane potential and ATP level. Conclusion 1-NP can cause mitochondrial damage, which leads to proliferation inhibition, cycle arrest and disorder of sex hormone synthesis, improve mitochondrial function, and thus partially alleviate 1-NP-induced dysfunction in KGN cells.
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- 2023
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10. Correction to 'Mitigation of Salinity Stress and Lead Toxicity in Maize by Exogenous Application of the Sorghum Water Extract'
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Sehar Rasool, Haifa A. S. Alhaithloul, Sobia Shahzad, Fahd Rasul, Wang Lihong, Adnan Noor Shah, Muhammad Nawaz, Asif Ghafoor, Muhammad Aamer, Muhammad Umair Hassan, Sezai Ercisli, Rayan S. Alharbi, Afaf A. Rashed, and Sameer H Qari
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Chemistry ,QD1-999 - Published
- 2024
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11. Assessment of genetic divergence in wheat lines (Triticum aestivum L.) involving biochemical and protein markers in rainfed conditions
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Mehvish RAMZAN, Wang LIHONG, Huma TARIQ, Syed F.A. GILLANI, Saima SHAFIQUE, Adnan RASHEED, and Mahmoud F. SELEIMAN
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antioxidant ,diversity ,flavonoid ,phenolic ,SDS PAGE ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Wheat (Triticum aestivum L.) is the important and strategic cereal crop for the majority of world’s populations. It is significant staple food of about two billion people. In next few years, world demand for wheat is expected to be 40 percent higher than that of its level today. Keeping in view the importance of the crop research work was conducted in the laboratory of Plant Breeding and Molecular Genetics, University of Poonch Rawalakot, AJK, Pakistan. The aim of the research was to find out the genetic diversity of different wheat lines. In the experiment, 50 different lines of wheat species (Triticum aestivum L.) was used to detect genetic diversity by utilizing Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis and biochemical analysis. On the basis of biochemical analysis lines 3111 and 3123 was diverse among 50 lines for antioxidant activity by using DPPH radical and 3135 and 3139 for phenolic contents and for flavonoid 3148 and 3107 was found more promising. Molecular characterization by SDS PAGE showed diversity in three wheat lines 3136, 3138 and 3110. These wheat lines could be our potential lines for future wheat improvement program as they were also promising regarding to the high yields.
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- 2023
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12. The critical role of nitrogen in plants facing the salinity stress: Review and future prospective
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Muhammad T. ASLAM, Imran KHAN, Muhammad U. CHATTHA, Rizwan MAQBOOL, Muhammad ZIAULHAQ, Wang LIHONG, Sajid USMAN, Adnan RASHEED, Muhammad U. HASSAN, Mohamed HASHEM, Rehab O. ELNOUR, Muhammad M. IQBAL, and Muhammad ARSHAD
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antioxidants ,ionic toxicity ,nitrogen ,oxidative damage ,salinity ,Forestry ,SD1-669.5 ,Agriculture (General) ,S1-972 - Abstract
Salinity stress is a serious abiotic stress that negatively affect the crop growth and development. Mineral nutrient supplementation is considered as an effective strategy to mitigate the adverse effects of salinity. Nitrogen (N) is an important nutrient needed for plants and its application also an effective strategy to mitigate adverse impacts of salinity. Salinity stress disturbs plant physiological, and biochemical functions, antioxidant activities, cellular membranes, antioxidant activities and nutrient uptake thereby cause significant reduction in plant growth and development. The application of N maintains membrane stability, plant water relations, leaf gas exchange characteristics, and protect the plants from oxidative damages which induce the salt tolerance in plants. Besides, this N also improves nutrient uptake and it also induce cellular signaling that mitigate the adverse impacts of salinity. Therefore, it is interesting to understand the role of N in inducing salt tolerance in plants. In present review the mechanisms of N uptake and assimilation in plants under saline conditions are discussed. The present review provides information on how N mitigates ionic toxicity, and oxidative damages and maintains nutrient balance to counter the toxic effects of salinity stress in plants. This review will help the readers to learning more about the role of N in inducing salt tolerance in plants.
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- 2023
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13. Antidiabetic agents: Do they hit the right targets?
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Zhao Yongting, Zhang Xiaofang, Liang Haihai, and Wang Lihong
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diabetes mellitus ,type 2 diabetes mellitus ,anti-diabetic drugs ,therapeutic target ,glycemic control ,insulin resistance ,deficient insulin secretion ,diabetic complications ,polypharmacology ,Special situations and conditions ,RC952-1245 - Abstract
Diabetes mellitus (DM) is a progressive metabolic disease characterized by chronic hyperglycemia and caused by different degree of pancreatic islet dysfunction and/or insulin resistance (IR). Long course DM can lead to a variety of macrovascular and microvascular complications which involve artery vessels, heart, kidney, retina, nervous system, etc. In recent years, DM has attracted more and more attention due to its high morbidity and mortality. In addition to achieve effective glycemic control, prevention of complications has also been considered a priority for type 2 diabetes mellitus (T2DM) management. Herein, we provide a comprehensive overview on the pharmacotherapeutics for T2DM and perspectives on the future directions of basic and translational research on anti-diabetic therapy and pharmatheutical development of new drugs.
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- 2022
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14. Application of Structured Light 3D Reconstruction Technology in Industrial Automation Scenarios in the Context of Digital Transformation
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Wang Lihong, Cai Jun, Zhang Yanan, Chen Dong, Ge Lv, and Zhang Yu
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Social Sciences - Abstract
In this work, a dynamic structured light 3D reconstruction method adapted to random phase shift step size is proposed for the problem of dynamic workpiece 3D reconstruction in industrial manufacturing scenes. The method firstly utilizes a structured light sinusoidal grating pattern to match the relative phase shift of the workpieces moving along the perpendicular direction of the stripes on the conveyor belt. Secondly, in order to solve the problem of non-uniform phase shift step length due to external vibration, electromagnetic radiation and other disturbing factors of the conveyor belt and other mechanical devices, the method proposes a dynamic structured light 3D reconstruction model based on RPSNet, which is based on the CycleGAN network model, and uses the AIR2U-net model proposed in this paper as the generator, and the multilayer convolutional neural network CNN as the discriminator to realize the grating map. discriminator to realize the conversion of raster map to depth map. Finally, for the problem that the network model needs a large amount of data for training and it is difficult to collect data in the actual industrial scene, this paper uses the Thing10k dataset, and the dataset made by Blender simulation software for model training. Finally, a higher quality 3D reconstruction of the workpiece is realized.
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- 2024
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15. Research Progress of Breast Ultrasound in the Screening of Breast Cancer
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WANG Yingjiao, WANG Lihong, LI Ruyin, SHEN Songjie, and SUN Qiang
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breast cancer ,ultrasound ,screening ,contrast-enhanced ultrasound ,automatic breast ultrasound system ,Medicine - Abstract
Breast cancer has become the most prevalent malignant tumor worldwide. Screening improves the rate of early detection and is important for the treatment and prognosis of breast cancer. Breast ultrasound is a common method for screening breast cancer, which can be used as a complementary screening tool to mammography to improve the rate of detection, or used for screening breast cancer alone. In recent years, the use of new techniques of ultrasound in screening breast cancer such as shear wave elastography and contrast-enhanced ultrasound, are rapidly developing. This article reviewed the research progress of clinical application of breast ultrasound in screening breast cancer.
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- 2022
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16. Clinical evaluation of non-invasive prenatal screening in 32,394 pregnancies from Changzhi maternal and child health care hospital of Shanxi China
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Li XiaoZe, Wang LiHong, Yao ZeRong, Ruan FangYing, Hu ZhiPeng, and Song WenXia
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nips ,trisomy ,false positive ,true positive ,z score ,snps variants ,Biochemistry ,QD415-436 - Abstract
Background: Non-invasive prenatal screening (NIPS) is a highly sensitive and specific screening test to detect fetal chromosomal abnormalities. The primary objective of this study was to evaluate the NIPS as an effective method for prenatal detection of aneuploidies in both high-risk and low-risk pregnancies. Methods: In current study, we performed NIPS in 32,394 pregnancies, out of which results were available in 32,361 (99.9%) of them. Illumina sequencing was performed for NIPS screening. Hypothesis Z test was used to classify fetal autosomal aneuploidy of T21, T18, and T13. Karyotyping was performed to determine the true negative and true positive NIPS results. Results: Among the 32,361 confirmed samples, 164 cases had positive results and 32197 cases had negative results. Of these positive cases, 116 cases were trisomy 21, 34 cases were trisomy 18 and 14 cases were trisomy 13. No false negative results were found in this cohort. The overall sensitivity and specificity were 100% and 99.91%, respectively. There was no significant difference in test performance between the 7,316 high-risk and 25,045 low-risk pregnancies, (sensitivity, 100% vs 100% (P>0.05); specificity, 99.96% vs 99.95% (P > 0.05)). Factors contributing to false-positive results included fetal copy number variants (CNVs), fetal mosaicism and typically producing Z scores between 3 and 4. Moreover, we analyzed NIPS wholegenome sequencing to investigate the Single Nucleotide Polymorphisms (SNPs) associations with drug response or risk of disease. As compare to the 1000g East Asian genome data, the results revealed a significant difference in 7,285,418 SNPs variants of Shanxi pregnant women including 19,293 clinvar recorded variants and 7,266,125 non-clinvar recorded. Conclusions: Our findings showed that NIPS was an effective assay that may be applied as routine screening for fetal trisomies in the prenatal setting. In addition, this study also provides an accurate assessment of significant differences in 7,285,418 SNPs variants in Shanxi pregnant women that were previously unavailable to clinicians in Shanxi population.
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- 2022
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17. Simulation of atom trajectories in the original Stern-Gerlach experiment
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Mostafaeipour, Faraz, Kahraman, S. Suleyman, Titimbo, Kelvin, Tan, Yixuan, and Wang, Lihong V.
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Physics - Computational Physics ,Physics - Atomic Physics - Abstract
Following a comprehensive analysis of the historical literature, we model the geometry of the Stern$\unicode{x2013}$Gerlach experiment to numerically calculate the magnetic field using the finite-element method. Using this calculated field and Monte Carlo methods, the atomic translational dynamics are simulated to produce the well-known quantized end-pattern with matching dimensions. The finite-element method used provides the most accurate description of the Stern$\unicode{x2013}$Gerlach magnetic field and end-pattern in the literature, matching the historically reported values and figures.
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- 2024
18. Derivations of Bloch (Majorana--Bloch) equation, von Neumann equation, and Schr\'odinger--Pauli equation
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Wang, Lihong V.
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Quantum Physics ,Physics - Atomic Physics - Abstract
The transition from classical physics to quantum mechanics has been mysterious. Here, we derive the space-independent von Neumann equation for electron spin mathematically from the classical Bloch or Majorana--Bloch equation, which is also derived. Subsequently, the space-independent Schr\"odinger--Pauli equation is derived in both the quantum mechanical and recently developed co-quantum dynamic frameworks.
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- 2024
19. Functional photoacoustic noninvasive Doppler angiography in humans
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Zhang, Yang, Olick-Gibson, Joshua, Sastry, Karteekeya, and Wang, Lihong V.
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Physics - Medical Physics ,Electrical Engineering and Systems Science - Signal Processing - Abstract
Optical imaging of blood flow yields critical functional insights into the circulatory system, but its clinical implementation has typically been limited to shallow depths (~1 millimeter) due to light scattering in biological tissue. Here, we present photoacoustic noninvasive Doppler angiography (PANDA) for deep blood flow imaging. PANDA synergizes the photoacoustic and Doppler effects to generate color Doppler velocity and power Doppler blood flow maps of the vascular lumen. Our results demonstrate PANDA's ability to measure blood flow in vivo up to one centimeter in depth, marking approximately an order of magnitude improvement over existing high-resolution pure optical modalities. PANDA enhances photoacoustic flow imaging by increasing depth and enabling cross-sectional blood vessel imaging. We also showcase PANDA's clinical feasibility through three-dimensional imaging of blood flow in healthy subjects and a patient with varicose veins. By integrating the imaging system onto a mobile platform, we have designed PANDA to be a portable modality that is primed for expedient clinical translation. PANDA offers noninvasive, single modality imaging of hemoglobin and blood flow with three-dimensional capability, facilitating comprehensive assessment of deep vascular dynamics in humans., Comment: 38 pages, 7 main figures, 10 supplementary figures
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- 2024
20. Diff3DS: Generating View-Consistent 3D Sketch via Differentiable Curve Rendering
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Zhang, Yibo, Wang, Lihong, Zou, Changqing, Wu, Tieru, and Ma, Rui
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Computer Science - Computer Vision and Pattern Recognition - Abstract
3D sketches are widely used for visually representing the 3D shape and structure of objects or scenes. However, the creation of 3D sketch often requires users to possess professional artistic skills. Existing research efforts primarily focus on enhancing the ability of interactive sketch generation in 3D virtual systems. In this work, we propose Diff3DS, a novel differentiable rendering framework for generating view-consistent 3D sketch by optimizing 3D parametric curves under various supervisions. Specifically, we perform perspective projection to render the 3D rational B\'ezier curves into 2D curves, which are subsequently converted to a 2D raster image via our customized differentiable rasterizer. Our framework bridges the domains of 3D sketch and raster image, achieving end-toend optimization of 3D sketch through gradients computed in the 2D image domain. Our Diff3DS can enable a series of novel 3D sketch generation tasks, including textto-3D sketch and image-to-3D sketch, supported by the popular distillation-based supervision, such as Score Distillation Sampling (SDS). Extensive experiments have yielded promising results and demonstrated the potential of our framework., Comment: Project: https://yiboz2001.github.io/Diff3DS/
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- 2024
21. De-aberration for transcranial photoacoustic computed tomography through an adult human skull
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Aborahama, Yousuf, Sastry, Karteekeya, Cui, Manxiu, Zhang, Yang, Luo, Yilin, Cao, Rui, and Wang, Lihong V.
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Physics - Medical Physics - Abstract
Noninvasive transcranial photoacoustic computed tomography (PACT) of the human brain, despite its clinical potential, remains impeded by the acoustic distortion induced by the human skull. The distortion, which is attributed to the markedly different material properties of the skull relative to soft tissue, results in heavily aberrated PACT images -- a problem that has remained unsolved in the past two decades. Herein, we report the first successful experimental demonstration of the de-aberration of PACT images through an ex-vivo adult human skull using a homogeneous elastic model for the skull. Using only the geometry, position, and orientation of the skull, we accurately de-aberrate the PACT images of light-absorbing phantoms acquired through an ex-vivo human skull, in terms of the recovered phantom features, for different levels of phantom complexity and positions. Our work addresses the longstanding challenge of skull-induced aberrations in transcranial PACT and advances the field towards unlocking the full potential of transcranial human brain PACT., Comment: 11 pages, 3 figures
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- 2024
22. Score-Based Diffusion Models for Photoacoustic Tomography Image Reconstruction
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Dey, Sreemanti, Saha, Snigdha, Feng, Berthy T., Cui, Manxiu, Delisle, Laure, Leong, Oscar, Wang, Lihong V., and Bouman, Katherine L.
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Physics - Medical Physics ,Computer Science - Computer Vision and Pattern Recognition ,Computer Science - Machine Learning ,Electrical Engineering and Systems Science - Image and Video Processing - Abstract
Photoacoustic tomography (PAT) is a rapidly-evolving medical imaging modality that combines optical absorption contrast with ultrasound imaging depth. One challenge in PAT is image reconstruction with inadequate acoustic signals due to limited sensor coverage or due to the density of the transducer array. Such cases call for solving an ill-posed inverse reconstruction problem. In this work, we use score-based diffusion models to solve the inverse problem of reconstructing an image from limited PAT measurements. The proposed approach allows us to incorporate an expressive prior learned by a diffusion model on simulated vessel structures while still being robust to varying transducer sparsity conditions., Comment: 5 pages
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- 2024
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23. Iterative Learning for Joint Image Denoising and Motion Artifact Correction of 3D Brain MRI
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Zhang, Lintao, Wu, Mengqi, Wang, Lihong, Steffens, David C., Potter, Guy G., and Liu, Mingxia
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Electrical Engineering and Systems Science - Image and Video Processing ,Computer Science - Computer Vision and Pattern Recognition ,Computer Science - Machine Learning - Abstract
Image noise and motion artifacts greatly affect the quality of brain MRI and negatively influence downstream medical image analysis. Previous studies often focus on 2D methods that process each volumetric MR image slice-by-slice, thus losing important 3D anatomical information. Additionally, these studies generally treat image denoising and artifact correction as two standalone tasks, without considering their potential relationship, especially on low-quality images where severe noise and motion artifacts occur simultaneously. To address these issues, we propose a Joint image Denoising and motion Artifact Correction (JDAC) framework via iterative learning to handle noisy MRIs with motion artifacts, consisting of an adaptive denoising model and an anti-artifact model. In the adaptive denoising model, we first design a novel noise level estimation strategy, and then adaptively reduce the noise through a U-Net backbone with feature normalization conditioning on the estimated noise variance. The anti-artifact model employs another U-Net for eliminating motion artifacts, incorporating a novel gradient-based loss function designed to maintain the integrity of brain anatomy during the motion correction process. These two models are iteratively employed for joint image denoising and artifact correction through an iterative learning framework. An early stopping strategy depending on noise level estimation is applied to accelerate the iteration process. The denoising model is trained with 9,544 T1-weighted MRIs with manually added Gaussian noise as supervision. The anti-artifact model is trained on 552 T1-weighted MRIs with motion artifacts and paired motion-free images. Experimental results on a public dataset and a clinical study suggest the effectiveness of JDAC in both tasks of denoising and motion artifact correction, compared with several state-of-the-art methods.
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- 2024
24. A tail index estimation for long memory processes
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Wang, Xiao and Wang, Lihong
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- 2024
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25. Identification of necroptosis-related gene expression and the immune response in polycystic ovary syndrome
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Tang, Xiuqin, Ji, Jinghua, Zhu, Lili, Sun, Fei, Wang, Lihong, and Xu, Wenting
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- 2024
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26. Potential mechanisms of ZiGongDing in treating HPV-induced cervical intraepithelial neoplasia: a network pharmacology and experimental verification study
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Wan, Li, Chen, Kan, Ma, Xiaorong, Han, Lu, Xie, Qun, Wang, Lihong, and Wang, Xinmei
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- 2024
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27. Effects of non⁃surgical periodontal treatment on level of vaspin and TNF⁃α in gingival crevicular fluid of type 2 diabetic patients with chronic periodontitis
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WANG Lihong, ZHANG Wenbiao, XI Lijun, BAO Aiqi, and HUANG Shiguang
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Visceral adipose tissue⁃derived serine protease inhibitor ,Tumor necrosis factor⁃alpha ,Gingival cre⁃ vicular fluid ,Periodontitis ,Type 2 diabetes mellitus ,Medicine - Abstract
Objective To investigate the changes of vaspin and TNF⁃α levels in gingival crevicular fluid (GCF) of type 2 diabetic (T2DM) patients with chronic periodontitis (CP) after non⁃surgical periodontal treatment. Methods 60 subjects were divided into 4 groups: DM ⁃CP group (patients with both T2DM and CP, n=15); CP group (CP patients without T2DM, n=15); DM group (T2DM patients without CP, n=15), and CTRL group (systemically and periodontally healthy individuals, n=15). The clinical parameters of periodontal tissue and GCF were measured before and 8 weeks after non⁃surgical periodontal treatment. The levels of vaspin and TNF⁃α were measured by ELISA. Results The lev⁃ els of vaspin and TNF⁃α in CP group were significantly higher than those in CTRL group (P < 0.05), while the levels of vaspin and TNF⁃α in CP group were significantly decreased after treatment (P < 0.05). There was a statistically signifi⁃ cant positive correlation between the total amount of vaspin and the total amount of TNF⁃α, the level of HbA1c, gingival index (GI) and probing depth (PD) (P < 0.05). Conclusion The results shows that vaspin and TNF⁃α are greatly de⁃creased in periodontitis after non⁃surgical periodontal treatment. It suggests that vaspin and TNF⁃ α in GCF may serve as inflammatory markers for the diagnosis and prognosis of diabetes and periodontitis.
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- 2017
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28. Can carbon emission trading improve corporate sustainability? An analysis of green path and value transformation effect of pilot policy
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Wang, Wei, Wang, Lihong, Sun, Ziyuan, and Ma, Dechao
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- 2024
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29. Gambling culture, corporate risk preference and bond risk premium
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Zhou, Yucheng, Chen, Jinchang, Wu, Shinong, and Wang, Lihong
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- 2024
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30. Photoacoustic vector tomography for deep haemodynamic imaging
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Zhang, Yang, Olick-Gibson, Joshua, Khadria, Anjul, and Wang, Lihong V.
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- 2024
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31. Ultrafast longitudinal imaging of haemodynamics via single-shot volumetric photoacoustic tomography with a single-element detector
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Zhang, Yide, Hu, Peng, Li, Lei, Cao, Rui, Khadria, Anjul, Maslov, Konstantin, Tong, Xin, Zeng, Yushun, Jiang, Laiming, Zhou, Qifa, and Wang, Lihong V.
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- 2024
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32. Variable selection for multivariate functional data via conditional correlation learning
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Wang, Keyao, Wang, Huiwen, Wang, Shanshan, and Wang, Lihong
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- 2024
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33. Multi-Modal Knowledge Graph Transformer Framework for Multi-Modal Entity Alignment
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Li, Qian, Ji, Cheng, Guo, Shu, Liang, Zhaoji, Wang, Lihong, and Li, Jianxin
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Computer Science - Computation and Language - Abstract
Multi-Modal Entity Alignment (MMEA) is a critical task that aims to identify equivalent entity pairs across multi-modal knowledge graphs (MMKGs). However, this task faces challenges due to the presence of different types of information, including neighboring entities, multi-modal attributes, and entity types. Directly incorporating the above information (e.g., concatenation or attention) can lead to an unaligned information space. To address these challenges, we propose a novel MMEA transformer, called MoAlign, that hierarchically introduces neighbor features, multi-modal attributes, and entity types to enhance the alignment task. Taking advantage of the transformer's ability to better integrate multiple information, we design a hierarchical modifiable self-attention block in a transformer encoder to preserve the unique semantics of different information. Furthermore, we design two entity-type prefix injection methods to integrate entity-type information using type prefixes, which help to restrict the global information of entities not present in the MMKGs. Our extensive experiments on benchmark datasets demonstrate that our approach outperforms strong competitors and achieves excellent entity alignment performance.
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- 2023
34. A Transparent and Nonlinear Method for Variable Selection
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Wang, Keyao, Wang, Huiwen, Zhao, Jichang, and Wang, Lihong
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Statistics - Methodology - Abstract
Variable selection is a procedure to attain the truly important predictors from inputs. Complex nonlinear dependencies and strong coupling pose great challenges for variable selection in high-dimensional data. In addition, real-world applications have increased demands for interpretability of the selection process. A pragmatic approach should not only attain the most predictive covariates, but also provide ample and easy-to-understand grounds for removing certain covariates. In view of these requirements, this paper puts forward an approach for transparent and nonlinear variable selection. In order to transparently decouple information within the input predictors, a three-step heuristic search is designed, via which the input predictors are grouped into four subsets: the relevant to be selected, and the uninformative, redundant, and conditionally independent to be removed. A nonlinear partial correlation coefficient is introduced to better identify the predictors which have nonlinear functional dependence with the response. The proposed method is model-free and the selected subset can be competent input for commonly used predictive models. Experiments demonstrate the superior performance of the proposed method against the state-of-the-art baselines in terms of prediction accuracy and model interpretability.
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- 2023
35. Whole-Body Human Ultrasound Tomography
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Garrett, David C., Xu, Jinhua, Ku, Geng, and Wang, Lihong V.
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Physics - Medical Physics - Abstract
We developed a system for whole-body human ultrasound tomography in reflection and transmission modes. A custom 512-element ultrasound receiver array with a rotating single-element ultrasound transmitter are used to generate 2D isotropically resolved images across the entire human cross-section. We demonstrate this technique in regions such as the abdomen and legs in healthy volunteers. Compared to handheld-probe-based ultrasonography, this approach provides a substantially larger field of view, depends less on operator training, and obtains quantitative tissue parameter profiles in addition to reflectivity images. Whole-body ultrasound tomography could be valuable in applications such as organ disease screening, image-guided needle biopsy, and treatment monitoring., Comment: 8 pages, 4 figures
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- 2023
36. Single-shot 3D photoacoustic computed tomography with a densely packed array for transcranial functional imaging
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Cao, Rui, Luo, Yilin, Xu, Jinhua, Luo, Xiaofei, Geng, Ku, Aborahama, Yousuf, Cui, Manxiu, Davis, Samuel, Na, Shuai, Tong, Xin, Liu, Cindy, Sastry, Karteek, Maslov, Konstantin, Hu, Peng, Zhang, Yide, Lin, Li, Zhang, Yang, and Wang, Lihong V.
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Physics - Medical Physics ,Electrical Engineering and Systems Science - Image and Video Processing ,Physics - Instrumentation and Detectors ,Physics - Optics - Abstract
Photoacoustic computed tomography (PACT) is emerging as a new technique for functional brain imaging, primarily due to its capabilities in label-free hemodynamic imaging. Despite its potential, the transcranial application of PACT has encountered hurdles, such as acoustic attenuations and distortions by the skull and limited light penetration through the skull. To overcome these challenges, we have engineered a PACT system that features a densely packed hemispherical ultrasonic transducer array with 3072 channels, operating at a central frequency of 1 MHz. This system allows for single-shot 3D imaging at a rate equal to the laser repetition rate, such as 20 Hz. We have achieved a single-shot light penetration depth of approximately 9 cm in chicken breast tissue utilizing a 750 nm laser (withstanding 3295-fold light attenuation and still retaining an SNR of 74) and successfully performed transcranial imaging through an ex vivo human skull using a 1064 nm laser. Moreover, we have proven the capacity of our system to perform single-shot 3D PACT imaging in both tissue phantoms and human subjects. These results suggest that our PACT system is poised to unlock potential for real-time, in vivo transcranial functional imaging in humans.
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- 2023
37. Brain Anatomy Prior Modeling to Forecast Clinical Progression of Cognitive Impairment with Structural MRI
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Zhang, Lintao, Wu, Jinjian, Wang, Lihong, Wang, Li, Steffens, David C., Qiu, Shijun, Potter, Guy G., and Liu, Mingxia
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Electrical Engineering and Systems Science - Image and Video Processing ,Computer Science - Computer Vision and Pattern Recognition - Abstract
Brain structural MRI has been widely used to assess the future progression of cognitive impairment (CI). Previous learning-based studies usually suffer from the issue of small-sized labeled training data, while there exist a huge amount of structural MRIs in large-scale public databases. Intuitively, brain anatomical structures derived from these public MRIs (even without task-specific label information) can be used to boost CI progression trajectory prediction. However, previous studies seldom take advantage of such brain anatomy prior. To this end, this paper proposes a brain anatomy prior modeling (BAPM) framework to forecast the clinical progression of cognitive impairment with small-sized target MRIs by exploring anatomical brain structures. Specifically, the BAPM consists of a pretext model and a downstream model, with a shared brain anatomy-guided encoder to model brain anatomy prior explicitly. Besides the encoder, the pretext model also contains two decoders for two auxiliary tasks (i.e., MRI reconstruction and brain tissue segmentation), while the downstream model relies on a predictor for classification. The brain anatomy-guided encoder is pre-trained with the pretext model on 9,344 auxiliary MRIs without diagnostic labels for anatomy prior modeling. With this encoder frozen, the downstream model is then fine-tuned on limited target MRIs for prediction. We validate the BAPM on two CI-related studies with T1-weighted MRIs from 448 subjects. Experimental results suggest the effectiveness of BAPM in (1) four CI progression prediction tasks, (2) MR image reconstruction, and (3) brain tissue segmentation, compared with several state-of-the-art methods.
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- 2023
38. Single-pulse ultrafast real-time simultaneous planar imaging of femtosecond laser-nanoparticle dynamics in flames
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Mishra, Yogeshwar Nath, Wang, Peng, Bauer, Florian J., Gudipati, Murthy S., and Wang, Lihong V.
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- 2024
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39. Sharp-peaked lanthanide nanocrystals for near-infrared photoacoustic multiplexed differential imaging
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Loh, Kang Yong, Li, Lei S., Fan, Jingyue, Goh, Yi Yiing, Liew, Weng Heng, Davis, Samuel, Zhang, Yide, Li, Kai, Liu, Jie, Liang, Liangliang, Feng, Minjun, Yang, Ming, Zhang, Hang, Ma, Ping’an, Feng, Guangxue, Mu, Zhao, Gao, Weibo, Sum, Tze Chien, Liu, Bin, Lin, Jun, Yao, Kui, Wang, Lihong V., and Liu, Xiaogang
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- 2024
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40. Association between serum 25-hydroxyvitamin D and vitamin D dietary supplementation and risk of all-cause and cardiovascular mortality among adults with hypertension
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Ye, Haowen, Li, Yexin, Liu, Shaomin, Zhang, Xiaofang, Liang, Huanzhu, Wang, Ying, Wang, Ruxin, Liu, Han, Wen, Yun, Jing, Chunxia, and Wang, Lihong
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- 2024
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41. Development of a novel dynamic nosocomial infection risk management method for COVID-19 in outpatient settings
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Wang, Yuncong, Wang, Lihong, Ma, Wenhui, Zhao, Huijie, Han, Xu, and Zhao, Xia
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- 2024
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42. Doxorubicin-loaded PEG-CdTe QDs conjugated with anti-CXCR4 mAbs: a novel delivery system for extramedullary multiple myeloma treatment
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Chen, Dangui, Chen, Fei, Lu, Jia, Wang, Lihong, Yao, Fusheng, and Xu, Haitao
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- 2024
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43. Novel JAG1 variants leading to Alagille syndrome in two Chinese cases
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Feng, Xiufang, Ping, Jiangyuan, Gao, Shan, Han, Dong, Song, Wenxia, Li, Xiaoze, Tao, Yilun, and Wang, Lihong
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- 2024
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44. Elevated first-trimester neutrophil elastase and proteinase 3 increase the risk of gestational diabetes mellitus and adverse fetal outcomes
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Wang, Lihong, Zhou, Zhoujunhao, Xu, Xinming, Li, Yue, Zhang, Rui, Yu, Zhiyan, Huang, Xinmei, Zang, Shufei, and Sun, Tiange
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- 2024
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45. The externality of politically connected directors’ resignations on peers’ cost of debt
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Liu, Ting, Kang, Shaoqing, and Wang, Lihong
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- 2024
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46. The effects of leaders’ economic and stakeholder values on subordinates’ discretionary behaviors as antecedents of perceived ethical leadership: a multilevel investigation
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Yu, Mingchuan, Dai, Yi, Xu, Miaoxin, Wang, Greg G., and Wang, Lihong
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- 2024
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47. TMEM65 promotes gastric tumorigenesis by targeting YWHAZ to activate PI3K-Akt-mTOR pathway and is a therapeutic target
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Shi, Lingxue, Wang, Xiaohong, Guo, Shang, Gou, Hongyan, Shang, Haiyun, Jiang, Xiaojia, Wei, Chunxian, Wang, Jia, Li, Chao, Wang, Lihong, Zhao, Zengren, Yu, Weifang, and Yu, Jun
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- 2024
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48. Attribute-Consistent Knowledge Graph Representation Learning for Multi-Modal Entity Alignment
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Li, Qian, Guo, Shu, Luo, Yangyifei, Ji, Cheng, Wang, Lihong, Sheng, Jiawei, and Li, Jianxin
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Computer Science - Computation and Language - Abstract
The multi-modal entity alignment (MMEA) aims to find all equivalent entity pairs between multi-modal knowledge graphs (MMKGs). Rich attributes and neighboring entities are valuable for the alignment task, but existing works ignore contextual gap problems that the aligned entities have different numbers of attributes on specific modality when learning entity representations. In this paper, we propose a novel attribute-consistent knowledge graph representation learning framework for MMEA (ACK-MMEA) to compensate the contextual gaps through incorporating consistent alignment knowledge. Attribute-consistent KGs (ACKGs) are first constructed via multi-modal attribute uniformization with merge and generate operators so that each entity has one and only one uniform feature in each modality. The ACKGs are then fed into a relation-aware graph neural network with random dropouts, to obtain aggregated relation representations and robust entity representations. In order to evaluate the ACK-MMEA facilitated for entity alignment, we specially design a joint alignment loss for both entity and attribute evaluation. Extensive experiments conducted on two benchmark datasets show that our approach achieves excellent performance compared to its competitors.
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- 2023
49. Noninvasive in vivo photoacoustic measurement of internal jugular venous oxygenation in humans
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Garcia-Uribe, Alejandro, Erpelding, Todd N., Ke, Haixin, Reddy, Kavya Narayana, Sharma, Anshuman, and Wang, Lihong V.
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Physics - Medical Physics - Abstract
In many clinical conditions, such as head trauma, stroke, and low cardiac output states, the brain is at risk for hypoxic-ischemic injury. The metabolic rate and oxygen consumption of the brain are reflected in internal jugular venous oxygen saturation (sijvO2). The current gold standard for monitoring brain oxygenation is invasive; it requires jugular vein catheterization under fluoroscopic guidance and therefore is rarely used. Photoacoustic (PA) measurement, on the other hand, can estimate the oxygen consumption of the brain non-invasively in real time. Such a convenient method can potentially aid earlier detection and prevention of impending hypoxic brain injury. A dual-wavelength photoacoustic tomography (PAT) and ultrasound imaging (US) system was used to image the internal jugular vein (IJV) and estimate the sijvO2 in seven healthy volunteers. The system captured simultaneous co-registered PAT and US images at a rate of five frames per second. For each volunteer, the internal jugular vein was identified under ultrasound guidance, then, additional PA images from two optical wavelengths were collected and used to estimate the oxygen saturation of the internal jugular vein. For each volunteer, the oxygen saturation was calculated from transverse and longitudinal views of the internal jugular vein. The average sijvO2 was 72 +/- 7 %. The preliminary results are encouraging and agree with those reported in the literature. Photoacoustic images were successfully used to calculate the blood hemoglobin oxygen saturation in the internal jugular vein. These results raise confidence that this emerging technology can be used clinically for accurate, noninvasive estimation of sijvO2. In addition, the fast co-registration with US images makes the technique suitable for studying the temporal variations of oxygen saturation in response to physiologic challenges in clinical settings.
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- 2023
50. Quantification of cervical elasticity during pregnancy based on transvaginal ultrasound imaging and stress measurement
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Hu, Peng, Zhao, Peinan, Qu, Yuan, Maslov, Konstantin, Chubiz, Jessica, Tuuli, Methodius G., Stout, Molly J., and Wang, Lihong V.
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Physics - Medical Physics ,Electrical Engineering and Systems Science - Image and Video Processing ,Electrical Engineering and Systems Science - Signal Processing - Abstract
Objective: Strain elastography and shear wave elastography are two commonly used methods to quantify cervical elasticity; however, they have limitations. Strain elastography is effective in showing tissue elasticity distribution in a single image, but the absence of stress information causes difficulty in comparing the results acquired from different imaging sessions. Shear wave elastography is effective in measuring shear wave speed (an intrinsic tissue property correlated with elasticity) in relatively homogeneous tissue, such as in the liver. However, for inhomogeneous tissue in the cervix, the shear wave speed measurement is less robust. To overcome these limitations, we develop a quantitative cervical elastography system by adding a stress sensor to an ultrasound imaging system. Methods: In an imaging session for quantitative cervical elastography, we use the transvaginal ultrasound imaging system to record B-mode images of the cervix showing its deformation and use the stress sensor to record the probe-surface stress simultaneously. We develop a correlation-based automatic feature tracking algorithm to quantify the deformation, from which the strain is quantified. After each imaging session, we calibrate the stress sensor and transform its measurement to true stress. Applying a linear regression to the stress and strain, we obtain an approximation of the cervical Young's modulus. Results: We validate the accuracy and robustness of this elastography system using phantom experiments. Applying this system to pregnant participants, we observe significant softening of the cervix during pregnancy (p-value < 0.001) with the cervical Young's modulus decreasing 3.95% per week. We estimate that geometric mean values of cervical Young's moduli during the first (11 to 13 weeks), second, and third trimesters are 13.07 kPa, 7.59 kPa, and 4.40 kPa, respectively., Comment: 26 pages, 8 figures, 1 table
- Published
- 2023
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