Results 211 to 220 of about 41,887 (245)

Time requirements of pre-acclimatization at simulated altitude to prevent acute mountain sickness. [PDF]

J Travel Med
Burtscher J, Hüfner K, Gatterer H, Pichler-Hefti J, Hefti U, Tannheimer M, Kleinsasser A, Hackett P, Burtscher M.   +8 more
europepmc   +1 more source

Freshwater fishes of the Waterberg aquatic ecoregion, South Africa: Diversity, taxonomic conflicts and conservation concerns

Journal of Fish Biology, EarlyView.
Abstract Southern Africa is a region denoted by both high levels of fish diversity, some of it cryptic and unrecognised by current taxonomy, and severely threatened freshwater ecosystems. The Waterberg, a key aquatic ecoregion of the greater Limpopo River basin in South Africa, represents an area with high terrestrial conservation value but is lacking ...
Darragh J. Woodford, Mandla Magoro, Wilbert T. Kadye, Martinus Scheepers, Yonela Sithole, Tadiwa I. Mutizwa, Tholoana Ntokoane, Albert Chakona   +7 more
wiley   +1 more source

The under-ice habitat constitutes a critical survival hub for zooplankton in the Central Arctic Ocean

Cornils A, Flores H, Wermeyer K, Anhaus P, Ashjian C, Campbell R, Castellani G, Gelfman C, Hildebrandt N, Hoppe C, Katlein C, Knüppel N, Sakinan S, Schaafsma F, Schmidt K, Shoemaker K, Vortkamp M, ECO I&OMT, Niehoff B.   +18 more
europepmc   +1 more source

Geochemical characteristics and sources of potassium and bromine in Salt-Lake Brines of the Junggar Basin, China. [PDF]

Sci Rep
Zhou C, Yang Z, Chen X, Liu C, Cheng X.
europepmc   +1 more source

Environmental changes and radioactive tracers [PDF]

, 2002
Badie, C., Bernard, C., Fernandez, J.M., Garrigue, Claire, Greaves, J., Rivaton, Jacques, Trescinski, M.   +6 more
core  

Oxygen consumption from air and water, ammonia and urea‐N excretion, and Na+ fluxes during progressive aquatic hypoxia in Amazonian armoured catfish Pterygoplichthys gibbiceps and Pterygoplichthys pardalis

Journal of Fish Biology, EarlyView.
Abstract The Amazonian loricariid fish Pterygoplichthys gibbiceps, from the Rio Negro, and Pterygoplichthys pardalis, from the Rio Solimões, are facultative air‐breathers that can use the stomach as an air‐breathing organ. Measurement of oxygen uptake under progressive aquatic hypoxia revealed a relatively high hypoxia resistance of both species.
Bernd Pelster, Chris M. Wood, Adalberto Luis Val   +2 more
wiley   +1 more source

The iADRS as an integrated measure of cognition and function: Psychometric evidence from recent clinical trials in early symptomatic Alzheimer's disease. [PDF]

Alzheimers Dement
Atkins AS, Marquis S, Creel K, Meunier J, Cano S, Delbecque L, Shan M, Wessels AM.   +7 more
europepmc   +1 more source

Quelques remarques au sujet de l'importance des influences politiques sur la découverte géographique et scientifique de la Centrafrique [PDF]

, 1983
Boulvert, Yves
core  

Nitrogen excretion and oxygen consumption under severe hypoxia in siluriform fishes from the Amazon

Journal of Fish Biology, EarlyView.
Abstract Siluriform fishes collected from the Rio Negro and Rio Solimões proved to be highly resistant to aquatic hypoxia. In all four species analysed in this study, aquatic oxygen consumption significantly decreased from normoxic levels at water PO2 values near 1 kPa. Air‐breathing activity was observed only in Sturisoma sp. (Rio Negro).
Bernd Pelster, Chris M. Wood, Adalberto Luis Val   +2 more
wiley   +1 more source

Branchial localization of acid (A‐type) and base (B‐type) excreting ionocytes in Amazonian stenohaline freshwater Potamotrygon ray

Journal of Fish Biology, EarlyView.
Abstract The branchial epithelium of Potamotrygon—a member of the only strictly freshwater elasmobranch family Potamotrygonidae—was observed via immunohistochemistry, and two distinct forms of ionocytes were identified. The acid (A‐type) and base (B‐type) secreting cells with respective basolateral–apical localizations of Na+/K+‐ATPase–Na+/H+ exchanger
M. W. Rossi, C. M. Wood, A. L. Val, J. M. Wilson   +3 more
wiley   +1 more source