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199 results on '"Schleger, P."'

1. Physiological strategies of acute thermal conditions of Rhamdia voulezi collected in the Iguaçu river watershed, Paraná, Brazil: biochemical markers of metabolic and oxidative stress

Author

da Silva, Niumaique Gonçalves, Ratko, Jonathan, Corrêa, Ana Paula Nascimento, da Silva, Diego Ortiz, Herrerias, Tatiana, Pereira, Diego Mauro Carneiro, Schleger, Ieda Cristina, Neundorf, Ananda Karla Alves, de Souza, Maria Rosa Dmengeon Pedreiro, and Donatti, Lucelia

Published
2024
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7. Metabolic responses in the gills of Yellowtail Lambari Astyanax lacustrisunder low‐ and high‐temperature thermal stress

Author

Schleger, Ieda Cristina, Pereira, Diego Mauro Carneiro, Resende, Anna Carolina, Romão, Silvia, Herrerias, Tatiana, Neundorf, Ananda Karla Alves, Souza, Maria Rosa Dmengeon Pedreiro, and Donatti, Lucélia

Abstract

Ectothermic fish are directly affected by temperature changes in the environment. The aim of this study was to evaluate the metabolic responses in the gills of Yellowtail Lambari Astyanax lacustrisunder thermal stress. To this end, we used spectrophotometry to evaluate the biomarkers of carbohydrate and protein metabolism, antioxidant defense, and oxidative damage in fish subjected to low (15°C) and high (31°C) temperatures, with control groups held at 23°C, for 2, 6, 12, 24, 48, and 96 h. The results showed that cold thermal stress did not change the energy demand, and the antioxidant defense was reduced; therefore, the gills were vulnerable to the action of reactive oxygen species (ROS), presenting increased protein carbonylation at 12 h. With heat thermal stress, a higher energy demand was observed, which was verified by an increase in aerobic metabolism by glycolysis and the citric acid cycle. High‐temperature stress also increased the antioxidant defenses, as verified by the increased activities of glutathione peroxidase, glutathione reductase, and glutathione S‐transferase. However, the antioxidant defense system could not protect tissues from the action of ROS, as protein carbonylation increased at 6 and 24 h, indicating oxidative stress. The results showed that (1) temperature variations caused metabolic adjustments in the gills of Yellowtail Lambari, (2) the adaptive responses were different for winter and summer temperatures, and (3) Yellowtail Lambari recovered homeostasis when subjected to thermal stress, even with the occurrence of oxidative stress. Impact statementThis study explores cellular stress responses in terms of metabolism, providing a comparison between low and high temperatures within an evolutionary and environmental context. These findings are crucial for fish farming and conservation efforts, revealing possible impacts of global climate change. This study explores cellular stress responses in terms of metabolism, providing a comparison between low and high temperatures within an evolutionary and environmental context. These findings are crucial for fish farming and conservation efforts, revealing possible impacts of global climate change.

Published
2024
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8. Auditory Habituation in the Fetus and Neonate: An fMEG Study

Author

Muenssinger, Jana, Matuz, Tamara, Schleger, Franziska, Kiefer-Schmidt, Isabelle, Goelz, Rangmar, Wacker-Gussmann, Annette, Birbaumer, Niels, and Preissl, Hubert

Abstract

Habituation--the most basic form of learning--is used to evaluate central nervous system (CNS) maturation and to detect abnormalities in fetal brain development. In the current study, habituation, stimulus specificity and dishabituation of auditory evoked responses were measured in fetuses and newborns using fetal magnetoencephalography (fMEG). An auditory habituation paradigm consisting of 100 trains of five 500 Hz tones, one 750 Hz tone (dishabituator) and two more 500 Hz tones, respectively, were presented to 41 fetuses (gestational age 30-39 weeks) and 22 newborns or babies (age 6-89 days). A response decrement between the first and fifth tones (habituation), an increment between the fifth tone and the dishabituator (stimulus specificity) and an increment between the fifth (last tone before the dishabituator) and seventh tones (first tone after the dishabituator) (dishabituation) were expected. Fetuses showed weak responses to the first tone. However, a significant response decrement between the second and fifth tones (habituation) and a significant increment between the fifth tone and the dishabituator (stimulus specificity) were found. No significant difference was found for dishabituation nor was a developmental trend found at the group level. From the neonatal data, significant values for stimulus specificity were found. Sensory fatigue or adaptation was ruled out as a reason for the response decrement due to the strong reactions to the dishabituator. Taken together, the current study used fMEG to directly show fetal habituation and provides evidence of fetal learning in the last trimester of pregnancy. (Contains 3 figures and 2 tables.)

Published
2013
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9. Use of the Neutron Spin Echo Technique to Observe Flux Line Motion

Author

Forgan, E. M., Kealey, P. G., Pautrat, A., Simon, Ch., Lee, S. L., Cubitt, R., Farago, B., Schleger, P., Beig, R., editor, Englert, B. -G., editor, Frisch, U., editor, Hänggi, P., editor, Hepp, K., editor, Hillebrandt, W., editor, Imboden, D., editor, Jaffe, R. L., editor, Lipowsky, R., editor, v. Löhneysen, H., editor, Ojima, I., editor, Sornette, D., editor, Theisen, S., editor, Weise, W., editor, Wess, J., editor, Zittartz, J., editor, Mezei, Ferenc, editor, Pappas, Catherine, editor, and Gutberlet, Thomas, editor

Published
2003
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16. Making International Videos: An Odyssey.

Author

Schleger, Peter R.

Abstract

Describes a trainer's experiences in video production for use abroad. Discusses submitting a proposal, converting U.S. technology standards that are incompatible with those of Europe, researching the content of the videos, writing the script, producing the video, and editing the final product. (JOW)

Published
1992

25. Search for magnetic fields due to anyons in high-T c superconductors

Author

Kiefl, R. F., Brewer, J. H., Affleck, I., Carolan, J. F., Dosanjh, P., Hardy, W. N., Hsu, T., Kadono, R., Kempton, J. R., Kreitzman, S. R., Li, Q., O'Reilly, A. H., Riseman, T. M., Schleger, P., Stamp, P. C. E., Zhou, H., Le, L. P., Luke, G. M., Sternlieb, B., Uemura, Y. J., Hart, H. R., and Lay, K. W.

Published
1991
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26. Site of the positive muon in YBa2Cu3O7

Author

Brewer, J. H., Kiefl, R. F., Carolan, J. F., Dosanjh, P., Hardy, W. N., Kreitzman, S. R., Li, Q., Riseman, T. M., Schleger, P., Zhou, H., Ansaldo, E. J., Noakes, D. R., Le, L. P., Luke, G. M., Uemura, Y. J., Hepburn-Wiley, K., and Stronach, C. E.

Published
1991
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30. Magnetic ordering in PrBa2Cu3-yAlyO6+x

Author

Longmore, A, Boothroyd, AT, Changkang, C, Yongle, H, Nutley, MP, Andersen, NH, Casalta, H, Schleger, P, and Christensen, AN

Published
2016

34. Video Visuals.

Author

Schleger, Peter R.

Abstract

A good training video has a focused objective, well-written script, clear sound track, and visuals that enhance the communication of the message. Good visuals depend on lighting, camera angles, continuity, and motivation for the scene. (SK)

Published
1991

44. Random-field structural transition in $YBa_2Cu_3O_{6.55}$

Author

Schleger, P., Hadfield, R. A., Casalta, H., Andersen, N. H., Poulsen, H. F., von Zimmermann, M., Schneider, J. R., Liang, R., Dosanjh, P., and Hardy, W. N.

Subjects
ddc:550
Abstract

Physical review letters 74, 1446-1449 (1995). doi:10.1103/PhysRevLett.74.1446, Published by APS, College Park, Md.

Published
1995
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48. Electro/magnetoencephalographic signatures of human brain insulin resistance

Author

Hege, Maike A, Kullmann, Stephanie, Heni, Martin, Schleger, Franziska, Linder, Katarzyna, Fritsche, Andreas, and Preissl, Hubert

Abstract

•Electro/magnetoencephalography allow the direct assessment of neuronal activity.•Human brain insulin resistance alters brain activity.•Human brain insulin resistance may already be programmed in utero.

Published
2016
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