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166 results on '"Hájek, T."'

1. Developing common protocols to measure tundra herbivory across spatial scales

Author

Barrio, I.C., primary, Ehrich, D., additional, Soininen, E.M., additional, Ravolainen, V.T., additional, Bueno, C.G., additional, Gilg, O., additional, Koltz, A.M., additional, Speed, J.D.M., additional, Hik, D.S., additional, Mörsdorf, M., additional, Alatalo, J.M., additional, Angerbjörn, A., additional, Bêty, J., additional, Bollache, L., additional, Boulanger-Lapointe, N., additional, Brown, G.S., additional, Eischeid, I., additional, Giroux, M.A., additional, Hájek, T., additional, Hansen, B.B., additional, Hofhuis, S.P., additional, Lamarre, J.-F., additional, Lang, J., additional, Latty, C., additional, Lecomte, N., additional, Macek, P., additional, McKinnon, L., additional, Myers-Smith, I.H., additional, Pedersen, Å.Ø., additional, Prevéy, J.S., additional, Roth, J.D., additional, Saalfeld, S.T., additional, Schmidt, N.M., additional, Smith, P., additional, Sokolov, A., additional, Sokolova, N., additional, Stolz, C., additional, van Bemmelen, R., additional, Varpe, Ø., additional, Woodard, P.F., additional, and Jónsdóttir, I.S., additional

Published
2022
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2. Developing common protocols to measure tundra herbivory across spatial scales

Author

Barrio, I.C., Ehrich, D., Soininen, E.M., Ravolainen, V.T., Bueno, C.G., Gilg, O., Koltz, A.M., Speed, J.D.M., Hik, D.S., Mörsdorf, M., Alatalo, J.M., Angerbjörn, A., Bêty, J., Bollache, L., Boulanger-lapointe, N., Brown, G.S., Eischeid, I., Giroux, M.A., Hájek, T., Hansen, B.B., Hofhuis, S.P., Lamarre, J.F., Lang, J., Latty, C., Lecomte, N., Macek, P., Mckinnon, L., Myers-smith, I.H., Pedersen, Å.O., Prevéy, J.S., Roth, J.D., Saalfeld, S.T., Schmidt, N.M., Smith, P., Sokolov, A., Sokolova, N., Stolz, C., van Bemmelen, R., Varpe, Ø., Woodard, P.F., Jónsdóttir, I.S., Barrio, I.C., Ehrich, D., Soininen, E.M., Ravolainen, V.T., Bueno, C.G., Gilg, O., Koltz, A.M., Speed, J.D.M., Hik, D.S., Mörsdorf, M., Alatalo, J.M., Angerbjörn, A., Bêty, J., Bollache, L., Boulanger-lapointe, N., Brown, G.S., Eischeid, I., Giroux, M.A., Hájek, T., Hansen, B.B., Hofhuis, S.P., Lamarre, J.F., Lang, J., Latty, C., Lecomte, N., Macek, P., Mckinnon, L., Myers-smith, I.H., Pedersen, Å.O., Prevéy, J.S., Roth, J.D., Saalfeld, S.T., Schmidt, N.M., Smith, P., Sokolov, A., Sokolova, N., Stolz, C., van Bemmelen, R., Varpe, Ø., Woodard, P.F., and Jónsdóttir, I.S.

Abstract

Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied, and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot- and site-level protocols were tested in the field during summers 2014–2015 at 11 sites, nine of them consisting of warming experimental plots included in the International Tundra Experiment (ITEX). The study area protocols were assessed during 2014–2018 at 24 study areas across the Arctic. Our protocols provide comparable and easy to implement methods for assessing the intensity of invertebrate herbivory within ITEX plots and for characterizing vertebrate herbivore communities at larger spatial scales. We discuss methodological constraints and make recommendations for how these protocols can be used and how sampling effort can be optimized to obtain comparable estimates of herbivory, both at ITEX sites and at large landscape scales. The application of these protocols across the tundra biome will allow characterizing and comparing herbivore communities across tundra sites and at ecologically relevant spatial scales, providing an important step towards a better understanding of tundra ecosystem responses to large-scale environmental change.

Published
2022

3. Concurrent antiepileptic and antipsychotic use moderates lithium’s effects on regional brain volumes: a mega-analysis from the ENIGMA-Bipolar Disorder Working Group

Author

King, S., Tronchin, G., Nabulsi, L., Thomopoulos, S.I., Fontana, E., Radua, J., Sim, K., Gruber, O., Yatham, L., Dannlowski, U., Kircher, T., Nenadic, I., Stein, F., Brosch, K., Howells, F., Haarman, B.C.M., Pomarol-Clotet, E., Vieta, E., Landen, M., Cannon, D., Alnæs, D., Westlye, L.T., Jaramillo, C. López, Soeiro-de-Souza, M. Gerhardt, Berk, M., Elvsåshagen, T., Roberts, G., Mitchell, P.B., Fullerton, J.M., Green, M.J., Quidé, Y., Hermesdorf, M., Berger, K., Soares, J., Satterthwaite, T., Savitz, J., Benedetti, F., Glahn, D., Hajek, T., Kuplicki, R., Gotlib, I.H., Amoretti, S., Sacchet, M., Favre, P., Van Rheenen, T., Karantonis, J. Anthony, Furlong, L., Forte, F., Rossell, S., Goldstein, B., Kennedy, K., Canales-Rodriguez, E., Lahud, E., Mwangi, B., Rodriguez-Cano, E., Salvador, R., Wu, M.-J., Houenou, J., Rodrigue, A., Melloni, E.M.T., Sponheim, S., Urosevic, S., Demro, C., Goya-Maldonado, R., Eyler, L., Thompson, P.M., Andreassan, O.A., Ching, C.R.K., and McDonald, C.

Published
2022
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4. Future directions in the field of Bipolar Disorder

Author

Bauer, M., Bechdolf, A., Bellivier, F., Bergink, V., Ceylan, D., Correll, C.U., Etain, B., Fagiolini, A., Geddes, J., Gonzalez-Pinto, A., Goodwin, G., Hajek, T., Henry, C., Kessing, L.V., Kupka, R., Lagerberg, T.V., Landen, M., Licht, R.W., Martinez-Cengotitabengoa, M., Morken, G., Nielsen, R.E., Rietschel, M., Ritter, P., Schulze, T., Scott, J., Severus, E., Squassina, A., Suwalska, A., Vieta, E., Yildiz, A., Reininghaus, E.Z., Dalkner, N., Wels, L., Stijic, M., Reif, A., Manchia, M., and Andreassen, O.A.

Published
2024
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9. P.0092 The efficacy of smartphone-based interventions in bipolar disorder: systematic-review and meta-analyses. A position paper from the ISBD Big Data Task-Force

Author

Anmella, G., Hidalgo-Mazzei, D., Faurhoilt-Jepsen, M., Passos, I., Ballester, P., Kapczinski, F., Mwangi, B., Birmaher, B., Brietzke, E., Hajek, T., Lopez-Jaramillo, C., Mansur, R., Alda, M., Haarman, B., Isometsa, E., Lam, R., McIntyre, R., Minuzzi, L., Yatham, L., Duffy, A., Hafeman, D., Goldstein, T., Meier, S., Kessing, L., and Vieta, E.

Published
2021
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10. Tundra Trait Team: A database of plant traits spanning the tundra biome

Author

Bjorkman, A.D., Myers-Smith, I.H., Elmendorf, S.C., Normand, S., Thomas, H.J.D., Alatalo, J.M., Alexander, H., Anadon‐Rosell, A., Angers‐Blondin, S., Bai, Y., Baruah, G., te Beest, M., Berner, L., Björk, R.G., Blok, D., Bruelheide, H., Buchwal, A., Buras, A., Carbognani, M., Christie, K., Collier, L.S., Cooper, E.J., Cornelissen, J.H.C., Dickinson, K.J.M., Dullinger, S., Elberling, B., Eskelinen, Anu Maria, Forbes, B.C., Frei, E.R., Iturrate‐Garcia, M., Good, M.K., Grau, O., Green, P., Greve, M., Grogan, P., Haider, S., Hájek, T., Hallinger, M., Happonen, K., Harper, K.A., Heijmans, M.M.P.D., Henry, G.H.R., Hermanutz, L., Hewitt, R.E., Hollister, R.D., Hudson, J., Hülber, K., Iversen, C.M., Jaroszynska, F., Jiménez‐Alfaro, B., Johnstone, J., Jorgensen, R.H., Kaarlejärvi, E., Klady, R., Klimešová, J., Korsten, A., Kuleza, S., Kulonen, A., Lamarque, L.J., Lantz, T., Lavalle, A., Lembrechts, J.J., Lévesque, E., Little, C.J., Luoto, M., Macek, P., Mack, M.C., Mathakutha, R., Michelsen, A., Milbau, A., Molau, U., Morgan, J.W., Mörsdorf, M.A., Nabe-Nielsen, J., Schøler Nielsen, S., Ninot, J.M., Oberbauer, S.F., Olofsson, J., Onipchenko, V.G., Petraglia, A., Pickering, C., Prevéy, J.S., Rixen, C., Rumpf, S.B., Schaepman-Strub, G., Semenchuk, P., Shetti, R., Soudzilovskaia, N.A., Spasojevic, M.J., Speed, J.D.M., Street, L.E., Suding, K., Tape, K.D., Tomaselli, M., Trant, A., Treier, U.A., Tremblay, J.-P., Tremblay, M., Venn, S., Virkkala, A.-M., Bjorkman, A.D., Myers-Smith, I.H., Elmendorf, S.C., Normand, S., Thomas, H.J.D., Alatalo, J.M., Alexander, H., Anadon‐Rosell, A., Angers‐Blondin, S., Bai, Y., Baruah, G., te Beest, M., Berner, L., Björk, R.G., Blok, D., Bruelheide, H., Buchwal, A., Buras, A., Carbognani, M., Christie, K., Collier, L.S., Cooper, E.J., Cornelissen, J.H.C., Dickinson, K.J.M., Dullinger, S., Elberling, B., Eskelinen, Anu Maria, Forbes, B.C., Frei, E.R., Iturrate‐Garcia, M., Good, M.K., Grau, O., Green, P., Greve, M., Grogan, P., Haider, S., Hájek, T., Hallinger, M., Happonen, K., Harper, K.A., Heijmans, M.M.P.D., Henry, G.H.R., Hermanutz, L., Hewitt, R.E., Hollister, R.D., Hudson, J., Hülber, K., Iversen, C.M., Jaroszynska, F., Jiménez‐Alfaro, B., Johnstone, J., Jorgensen, R.H., Kaarlejärvi, E., Klady, R., Klimešová, J., Korsten, A., Kuleza, S., Kulonen, A., Lamarque, L.J., Lantz, T., Lavalle, A., Lembrechts, J.J., Lévesque, E., Little, C.J., Luoto, M., Macek, P., Mack, M.C., Mathakutha, R., Michelsen, A., Milbau, A., Molau, U., Morgan, J.W., Mörsdorf, M.A., Nabe-Nielsen, J., Schøler Nielsen, S., Ninot, J.M., Oberbauer, S.F., Olofsson, J., Onipchenko, V.G., Petraglia, A., Pickering, C., Prevéy, J.S., Rixen, C., Rumpf, S.B., Schaepman-Strub, G., Semenchuk, P., Shetti, R., Soudzilovskaia, N.A., Spasojevic, M.J., Speed, J.D.M., Street, L.E., Suding, K., Tape, K.D., Tomaselli, M., Trant, A., Treier, U.A., Tremblay, J.-P., Tremblay, M., Venn, S., and Virkkala, A.-M.

Abstract

MotivationThe Tundra Trait Team (TTT) database includes field‐based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade‐offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable containedThe database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grainMeasurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub‐Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grainAll data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurementTrait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software formatcsv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.

Published
2018

11. Tundra Trait Team: A database of plant traits spanning the tundra biome

Author

Bjorkman, A. D., Myers-Smith, I. H., Elmendorf, S. C., Normand, S., Thomas, H. J. D., Alatalo, J. M., Alexander, H., Anadon-Rosell, A., Angers-Blondin, S., Bai, Y., Baruah, G., te Beest, M., Berner, L., Björk, R. G., Blok, D., Bruelheide, H., Buchwal, A., Buras, A., Carbognani, M., Christie, K., Collier, L. S., Cooper, E. J., Cornelissen, J. H. C., Dickinson, K. J. M., Dullinger, S., Elberling, B., Eskelinen, A., Forbes, B. C., Frei, E. R., Iturrate-Garcia, M., Good, M. K., Grau, O., Green, P., Greve, M., Grogan, P., Haider, S., Hájek, T., Hallinger, M., Happonen, K., Harper, K. A., Heijmans, M. M. P. D., Henry, G. H. R., Hermanutz, L., Hewitt, R. E., Hollister, R. D., Hudson, J., Hülber, K., Iversen, C. M., Jaroszynska, F., Jiménez-Alfaro, B., Johnstone, J., Jorgensen, R. H., Kaarlejärvi, E., Klady, R., Klimešová, J., Korsten, A., Kuleza, S., Kulonen, A., Lamarque, L. J., Lantz, T., Lavalle, A., Lembrechts, J. J., Lévesque, E., Little, C. J., Luoto, M., Macek, P., Mack, M. C., Mathakutha, R., Michelsen, A., Milbau, A., Molau, U., Morgan, J. W., Mörsdorf, M. A., Nabe-Nielsen, J., Nielsen, S. S., Ninot, J. M., Oberbauer, S. F., Olofsson, J., Onipchenko, V. G., Petraglia, A., Pickering, C., Prevéy, J. S., Rixen, C., Rumpf, S. B., Schaepman-Strub, G., Semenchuk, P., Shetti, R., Soudzilovskaia, N. A., Spasojevic, M. J., Speed, J. D. M., Street, L. E., Suding, K., Tape, K. D., Tomaselli, M., Trant, A., Treier, U. A., Tremblay, J. P., Tremblay, M., Venn, S., Virkkala, A. M., Vowles, T., Weijers, S., Wilmking, M., Wipf, S., Zamin, T., Bjorkman, A. D., Myers-Smith, I. H., Elmendorf, S. C., Normand, S., Thomas, H. J. D., Alatalo, J. M., Alexander, H., Anadon-Rosell, A., Angers-Blondin, S., Bai, Y., Baruah, G., te Beest, M., Berner, L., Björk, R. G., Blok, D., Bruelheide, H., Buchwal, A., Buras, A., Carbognani, M., Christie, K., Collier, L. S., Cooper, E. J., Cornelissen, J. H. C., Dickinson, K. J. M., Dullinger, S., Elberling, B., Eskelinen, A., Forbes, B. C., Frei, E. R., Iturrate-Garcia, M., Good, M. K., Grau, O., Green, P., Greve, M., Grogan, P., Haider, S., Hájek, T., Hallinger, M., Happonen, K., Harper, K. A., Heijmans, M. M. P. D., Henry, G. H. R., Hermanutz, L., Hewitt, R. E., Hollister, R. D., Hudson, J., Hülber, K., Iversen, C. M., Jaroszynska, F., Jiménez-Alfaro, B., Johnstone, J., Jorgensen, R. H., Kaarlejärvi, E., Klady, R., Klimešová, J., Korsten, A., Kuleza, S., Kulonen, A., Lamarque, L. J., Lantz, T., Lavalle, A., Lembrechts, J. J., Lévesque, E., Little, C. J., Luoto, M., Macek, P., Mack, M. C., Mathakutha, R., Michelsen, A., Milbau, A., Molau, U., Morgan, J. W., Mörsdorf, M. A., Nabe-Nielsen, J., Nielsen, S. S., Ninot, J. M., Oberbauer, S. F., Olofsson, J., Onipchenko, V. G., Petraglia, A., Pickering, C., Prevéy, J. S., Rixen, C., Rumpf, S. B., Schaepman-Strub, G., Semenchuk, P., Shetti, R., Soudzilovskaia, N. A., Spasojevic, M. J., Speed, J. D. M., Street, L. E., Suding, K., Tape, K. D., Tomaselli, M., Trant, A., Treier, U. A., Tremblay, J. P., Tremblay, M., Venn, S., Virkkala, A. M., Vowles, T., Weijers, S., Wilmking, M., Wipf, S., and Zamin, T.

Abstract

Motivation: The Tundra Trait Team (TTT) database includes field-based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade-offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub-Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.

Published
2018

14. Different functional responsibility of the small intestine to high-fat/high-energy diet determined the expression of obesity-prone and obesity-resistant phenotypes in rats

Author

Lenhardt L, Zuzana Šefčíková, Mozes S, Racek L, and Hájek T

Subjects
Male, medicine.medical_specialty, Time Factors, Physiology, Biology, Weight Gain, Feed conversion ratio, Energy homeostasis, Rats, Sprague-Dawley, Eating, Internal medicine, Intestine, Small, medicine, Animals, Homeostasis, Obesity, Intestinal Mucosa, Adiposity, Obesity resistant, Hypertrophy, General Medicine, Alkaline Phosphatase, medicine.disease, Adaptation, Physiological, Dietary Fats, Phenotype, Small intestine, Rats, Disease Models, Animal, medicine.anatomical_structure, Endocrinology, Obesity prone, Disease Susceptibility, medicine.symptom, Energy Intake, Energy Metabolism, Weight gain, Glucosidases
Abstract

The objective of the present experiment was to assess the involvement of small intestine in expression of susceptibility or resistance to the high-fat/high-energy diet. The investigation was carried out in adult male Sprague-Dawley rats fed either standard laboratory diet (3.2 kcal/g, 9.5 % fat) or high-fat (HF) diet (4.04 kcal/g, 30 % fat) for 4 weeks as well as in HF rats that were retrospectively designated on the bases of their higher or lower weight gain as sensitive (DIO) or resistant (DR) to obesity. Our results revealed in HF group significant increase in energy intake, food efficiency, weight gain and Lee´s index of obesity. Moreover, in comparison with controls, a significantly increased duodenal and jejunal alkaline phosphatase (AP) and α-glucosidase activity as well as hypertrophy of jejunal mucosa (increased protein/DNA ratio) were observed in HF fed rats. In contrast, intestinal function was inversely related to energy intake or to the development of adiposity in DIO vs. DR rats. The DR rats had significantly greater AP and α-glucosidase activity and more pronounced suppression of energy intake than obese DIO rats. It indicates that the increase of enzyme activities and the lowered effectiveness of nutrient absorption might be a significant factor preventing the expression of obesity proneness. This information contributes to a better understanding of a complex interaction between HF diet feeding and small intestinal adaptability, which determines the energy homeostasis and predict the ability to resist or develop obesity in these phenotypes.

Published
2008

18. A hemiparasite in the forest understorey: photosynthetic performance and carbon balance of Melampyrum pratense.

Author

Světlíková, P., Hájek, T., and Těšitel, J.

Subjects
*PHOTOSYNTHESIS, *PLANT species, *GAS exchange in plants, *CARBON fixation, *PLANT classification
Abstract

• Melampyrum pratense is an annual root-hemiparasitic plant growing mostly in forest understorey, an environment with unstable light conditions. While photosynthetic responses of autotrophic plants to variable light conditions are in general well understood, light responses of root hemiparasites have not been investigated. • We carried out gas exchange measurements (light response and photosynthetic induction curves) to assess the photosynthetic performance of M. pratense in spring and summer. These data and recorded light dynamics data were subsequently used to model carbon balance of the hemiparasite throughout the entire growth season. • Summer leaves had significantly lower rates of saturated photosynthesis and dark respiration than spring leaves, a pattern expected to reflect the difference between sunand shade-adapted leaves. However, even the summer leaves of the hemiparasite exhibited a higher rate of light-saturated photosynthesis than reported in non-parasitic understorey herbs. This is likely related to its annual life history, rare among other understorey herbs. The carbon balance model considering photosynthetic induction still indicated insufficient autotrophic carbon gain for seed production in the summer months due to limited light availability and substantial carbon loss through dark respiration. • The results point to potentially high importance of heterotrophic carbon acquisition in M. pratense, which could be of at least comparable importance as in other mixotrophic plants growing in forests - mistletoes and partial mycoheterotrophs. It is remarkable that despite apparent evolutionary pressure towards improved carbon acquisition from the host, M. pratense retains efficient photosynthesis and high transpiration rate, the ecophysiological traits typical of related root hemiparasites in the Orobanchaceae. [ABSTRACT FROM AUTHOR]

Published
2018
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21. [The role of procalcitonin in the patient assessment after surgical procedures]

Author

Hájek T, Bartůnĕk L, Ondrej Topolcan, Polívková V, Hess Z, and Holubec L

Subjects
Calcitonin, Leukocyte Count, C-Reactive Protein, Postoperative Complications, Calcitonin Gene-Related Peptide, Cardiovascular Surgical Procedures, Humans, Protein Precursors, Biomarkers
Abstract

In the group of 450 patients operated in the Cardiosurgical Department of the Faculty Hospital in Plzen during the period from III/2003 till XI/2003, 1451 samples were collected to examine the following-procalcitonin levels (PCT), white blood cell counts (Leu) and C-reactive protein levels (CRP). The findings were assessed with respect to the respective patient's clinical status, and any correlation between procedures with extracorporeal circulation (MO), signs of inflammation, septic and non-septic serious complications and between the above mentioned markers levels, was searched. It was detected, that the PCT levels correlated well with the clinical signs of inflammation and sepsis, as well as with the non-inflammatory complications. The CRP and Leu changes were not statistically significant and their levels are commonly increased by the surgical procedure itself.

Published
2004

24. [Aortocoronary bypass without extracorporeal circulation]

Author

Straka Z, Hájek T, Votava J, Ticháçek D, Brůcek P, and Vanĕk T

Subjects
Male, Extracorporeal Circulation, Postoperative Complications, Humans, Female, Coronary Artery Bypass, Middle Aged, Aged
Abstract

Extracorporeal circulation is nowadays part of the standard technique of aortocoronary reconstruction. The authors summarize in their paper their experience with operations in 45 patients where an aortocoronary bypass was made on the beating heart without the use of extracorporeal circulation. None of the patients died. The incidence of postoperative complications was low. Rapid rehabilitation of the patients and a shorter period of hospitalization makes this method an alternative standard technique of aortocoronary reconstruction.

Published
1998

26. [Preparation, storage, transportation and use of heart valves for allotransplantation]

Author

Jaroslav SPATENKA, Kostelka M, Kobylka P, Hucín B, Honĕk T, Lochmann O, Hájek T, Tláskal T, Povýsilová V, and Fiser B

Subjects
Tissue and Organ Procurement, Humans, Sterilization, Transplantation, Homologous, Organ Preservation, Heart Valves
Abstract

Thanks to the co-operation with Czech and Slovak Transplant Centres and with some of the Departments of Pathology and Forensic Medicine 274 hearts were collected for allograft heart valves (AHV) processing during 1992-1995. The Cardiac surgeon dissected the aortic valve with the root and the pulmonary artery trunk with the valve. Tissues were antibiotically (ATB) sterilised in cultivation medium E 199 (24 hours at 37 degrees C). ATB concentrations (mg/ml): Cepharin 0.2, Azlocilin 0.2, Tobramycin 0.08 and Amphotericin B 0.1 for harvesting at post-mortem (P) or Miconazol 0.05 for sterile retrieval during multiorgan harvesting (MOH). After sterilisation AHV were stored at 4 degrees C. 49 AHV were infected even after ATB treatment-15 of 35 collected at P (43%) and 35 of 218 procured during MOH (16%)-(p0.01-ch2 test). After serological screening of the donor and microbiological testing the AHV were released for clinical use. Most AHV were programmed cooled to the temperature of liquid nitrogen (-196 degrees C), in which they were stored at the Allograft Heart Valves Cryobank. Cryoprotection was achieved by 10% dimethylsulphidoxide.A technology of harvesting, processing, storage and transportation of AHV, was introduced. It enabled the routine use in many cardiac surgical units. The AHV Cryobank was established. 131 AHV were used clinically between 1992 and 1995 (transportation as far as 1300 km). 108 AHV (82.4%) were used for repair of complex congenital heart defects, while 23 (17.6%) were used for aortic valve and/or root replacement.

Published
1997

27. [Minimally invasive myocardial revascularization. Initial experience with myocardial revascularization without extracorporeal circulation]

Author

Hájek T, Honĕk T, Jaroslav SPATENKA, Horn M, Pálenícková J, David T, Jurenka B, and Hlavácek K

Subjects
Male, Cardiopulmonary Bypass, Myocardial Revascularization, Humans, Minimally Invasive Surgical Procedures, Coronary Disease, Female, Middle Aged, Aged
Abstract

The authors present an account on the first phase of application of minimally invasive techniques of revascularization of the heart into clinical practice at their department. Since December 1994 to the end of January 1995 in selected 15 patients from a total of 240 patients with IHD 16 arterial and 8 venous grafts were sutured on the beating heart from median sternotomy. None of the patients died and none need reoperation. All patients are free from anginous complaints after operation and their clinical condition is satisfactory. Revascularization of the heart by means of arterial and venous grafts on the beating heart from median sternotomy is a technically reproducible method which enables us to elaborate further minimally invasive procedures for the treatment of IHD. The presented paper is a preliminary communication without claims of statistical validity of the achieved results.

Published
1996

28. [Minithoracotomy in cardiac surgery. Initial experience with closure of an atrial septal defect with a minithoracotomy]

Author

Honĕk T, Jaroslav SPATENKA, Hájek T, Horn M, Pálenícková J, Hlavácek K, Cvachovec K, and Hucín B

Subjects
Adult, Adolescent, Thoracotomy, Humans, Minimally Invasive Surgical Procedures, Female, Heart Septal Defects, Atrial
Abstract

The authors describe their own modification of closure of an atrial septal defect (ASD) from right anterolateral minothoracotomy. This minimally invasive approach was selected in girls and women. Right anterolateral thoracotomy was used in 1987 to 1994 in twelve female patients. With regard to the general trend towards aesthetic surgery the authors use at present minimal anterolateral right-sided thoracotomy which with regard to its close relationship with the right atrium makes a safe surgical access to the atrial septum possible. Extracorporeal circulation is implemented by cannulation of the iliac artery in the groin, venous return is ensured by cannulas inserted into the venae cavae in the surgical field (by the auricle of the right atrium into the vena cava superior and the right atrial wall into the vena cava inferior). The operation itself is performed with electric fibrillation of the heart and tightening of the venous tourniquets. Between January 1995 till March 1996 the authors made by the thus modified approach a closure of the ASD type secundum in four female patients age 17, 29, 35 and 40 years. ASD was located always in the fossa ovalis and was repaired by direct suture. The duration of the extracorporeal circulation was on average 30 minutes. The length of the skin incision was 8-10 cm. The operation was free from complications. The cosmetic result is excellent and is consistent with principles of aesthetic surgery. If an arterial cannula is inserted into the groin minithoracotomy can be recommended for closure of ASD with extracorporeal circulation as a safe method.

Published
1996

37. Desiccation tolerance of Sphagnum revisited: a puzzle resolved.

Author

Hájek, T., Vicherová, E., and Adams, W.

Subjects
*PEAT mosses, *ECOSYSTEMS, *ACIDIFICATION, *BRYOPHYTES, *DROUGHTS, *PLANT-water relationships, *DRYING of seeds
Abstract

As ecosystem engineers, Sphagnum mosses control their surroundings through water retention, acidification and peat accumulation. Because water retention avoids desiccation, sphagna are generally intolerant to drought; however, the literature on Sphagnum desiccation tolerance ( DT) provides puzzling results, indicating the inducible nature of their DT. To test this, various Sphagnum species and other mesic bryophytes were hardened to drought by (i) slow drying; (ii) ABA application and (iii) chilling or frost. DT tolerance was assessed as recovery of chlorophyll fluorescence parameters after severe desiccation. We monitored the seasonal course of DT in bog bryophytes. Under laboratory conditions, following initial de-hardening, untreated Sphagnum shoots lacked DT; however, DT was induced by all hardening treatments except chilling, notably by slow drying, and in Sphagnum species of the section Cuspidata. In the field, sphagna in hollows and lawns developed DT several times during the growing season, responding to reduced precipitation and a lowered water table. Hummock and aquatic species developed DT only in late autumn, probably as a response to frost. Sphagnum protonemata failed to develop DT; hence, desiccation may limit Sphagnum establishment in drier habitats with suitable substrate chemistry. Desiccation avoiders among sphagna form compact hummocks or live submerged; thus, they do not develop DT in the field, lacking the initial desiccation experience, which is frequent in hollow and lawn habitats. We confirmed the morpho-physiological trade-off: in contrast to typical hollow sphagna, hummock species invest more resources in water retention (desiccation avoidance), while they have a lower ability to develop physiological DT. [ABSTRACT FROM AUTHOR]

Published
2014
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