Search Results - (Author, Cooperation:L. Sundin)
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1Latest Papers from Table of Contents or Articles in PressR. Vanholme ; I. Cesarino ; K. Rataj ; Y. Xiao ; L. Sundin ; G. Goeminne ; H. Kim ; J. Cross ; K. Morreel ; P. Araujo ; L. Welsh ; J. Haustraete ; C. McClellan ; B. Vanholme ; J. Ralph ; G. G. Simpson ; C. Halpin ; W. Boerjan
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-08-21Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Arabidopsis/*enzymology/genetics ; Arabidopsis Proteins/*chemistry/genetics ; Carboxylic Ester Hydrolases/*chemistry/genetics ; Glucose/chemistry ; Lignin/*biosynthesis ; Metabolic Networks and Pathways ; Mutation ; Shikimic Acid/chemistry ; Substrate SpecificityPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1432-136XKeywords: Key words Endothelin ; Gill ; Oncorhynchus mykiss ; Osmoregulation ; RespirationSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract The lamellae of the fish gill are the primary sites for oxygen uptake from the water. Here, only two very thin layers of cells separate the blood from the water. Therefore, energetically costly ion-fluxes will also occur between blood and water, and it has been hypothesised that the blood flow within the lamellae can be regulated through vasoconstriction, but evidence for this has been lacking. Through direct observations of the lamellae of rainbow trout (Oncorhynchus mykiss) in vivo, using epi-illumination microscopy, we show here that an endothelium-derived vasoactive peptide, endothelin-1 (ET-1, 0.2 μg kg−1 or 1.0 μg kg−1), is able to completely constrict the vascular sheet in the lamellae, probably by inducing contraction of pillar cells. This coincided with a dose-dependent increase in ventral aortic blood pressure (rising from 6.6 kPa to 12.0 kPa in response to the high ET-1 dose). However, blood continued to flow through the marginal channel that circumvents each lamella. Thus, ET-1 caused an intralamellar blood shift from the lamellar sheet towards the marginal channels. Vasoconstriction in the lamellae is likely to provide the fish with a mechanism for matching its respiratory surface area with its respiratory needs, thereby minimising ion-fluxes.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesForster, M. E. ; Davison, W. ; Axelsson, M. ; Sundin, L. ; Franklin, C. E. ; Gieseg, S.
Springer
Published 1998Staff ViewISSN: 1432-136XKeywords: Key words Antarctic ; Catecholamines ; Nototheniid ; Red cell swelling ; StressSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract Two species of Antarctic fish were stressed by moving them from seawater at −1 °C to seawater at 10 °C and holding them for a period of 10 min. The active cryopelagic species Pagothenia borchgrevinki maintained heart rate while in the benthic species Trematomus bernacchii there was an increase in heart rate. Blood pressure did not change in either species. Both species released catecholamines into the circulation as a consequence of the stress. P. borchgrevinki released the greater amounts, having mean plasma concentrations of 177 ± 54 nmol · l−1 noradrenaline and 263 ± 131 nmol · l−1 adrenaline at 10 min. Plasma noradrenaline concentrations rose to 47 ± 14 nmol · l−1 and adrenaline to 73 ± 28 nmol · l−1 in T. bernacchii. Blood from P. borchgrevinki was tonometered in the presence of isoprenaline. A fall in extracellular pH suggests the presence of a Na+/H+ antiporter on the red cell membrane, the first demonstration of this in an Antarctic fish. Treatment with the β-adrenergic antagonist drug sotalol inhibited swelling of red blood cells taken from temperature-stressed P. borchgrevinki, suggesting that the antiporter responds to endogenous catecholamines.Type of Medium: Electronic ResourceURL: