.... pulex exposed to a serially diluted ion matrix, calcium uptake rates were positively associated with oxygen consumption rates (r(5)=-0.93, p=0.02). This positive association between Ca uptake rate and oxygen consumption was also observed when conductivity was held constant, but Ca concentration...

... by The Company of Biologists Ltd 2021 Summary: Interneurons of the goldfish retina are resistant to the effects of hypoxia as a result of an intracellular pathway involving ATP-dependent K + channels of the mitochondrial membrane. Excitotoxicity Retina Calcium Mitochondria mK ATP ATP...

... eggs and obligate placentotrophy. One major event that favored the evolution of placentation was the reduction of the eggshell. As with all oviparous reptiles, lizard embryos obtain calcium from both the eggshell and egg yolk. Therefore, the loss of the eggshell likely imposes a constraint...

... −1 , citral and carvone produced a significant reduction in EPSP amplitude, with citral producing the largest effect. Measurement of miniature EPSP amplitudes demonstrated that citral produced over a 50% reduction in transmitter release. Calcium imaging experiments showed that citral produced about...

... sarcomeres by observing length changes of proximal and distal titin segments in the presence and absence of calcium. We labeled I-band titin with fluorescent F146 antibody in rabbit psoas myofibrils and tracked segmental elongations during passive (no calcium) and active (high calcium) stretch. Without...

... picta bellii . Skinned multicellular preparations were exposed to six treatments with physiologically relevant levels of pH (7.4, 7.0, 6.6) and P i (3 and 8 mmol l −1 ). Each preparation was tested in a range of calcium concentrations (pCa 9.0–4.5) to determine the pCa–tension relationship for each...

...Raymond W. M. Kwong; Yusuke Kumai; Velislava Tzaneva; Estelle Azzi; Nina Hochhold; Cayleih Robertson; Bernd Pelster; Steve F. Perry ABSTRACT The present study investigated the potential role of hypoxia-inducible factor (HIF) in calcium homeostasis in developing zebrafish ( Danio rerio...

... ) or relaxation rates (all P >0.13; Fig. S1C,D ). These data indicate that SERCA activity and resequestration of calcium into the sarcoplasmic reticulum do not constrain force production acutely during a single tetanus. However, statistical power was very low for all muscle activation and relaxation rate...

...Jenny Tynyakov; Shmuel Bentov; Shai Abehsera; Galit Yehezkel; Ziv Roth; Isam Khalaila; Simy Weil; Amir Berman; Inbar Plaschkes; Moshe Tom; Eliahu D. Aflalo; Amir Sagi ABSTRACT Some crustaceans possess exoskeletons that are reinforced with calcium carbonate. In the crayfish Cherax quadricarinatus...

...Wei Chen; Fei Zhao; Zhi Mei Tian; Han Xing Zhang; Dong Ruan; Yan Li; Shuang Wang; Chun Tian Zheng; Ying Cai Lin ABSTRACT The objective of this study was to determine the effects of dietary calcium deficiency on the process of shell formation. Four hundred and fifty female ducks ( Anas platyrhynchos...

...David James Dukoff; David William Hogg; Peter John Hawrysh; Leslie Thomas Buck Oxygen deprivation triggers excitotoxic cell death in mammal neurons through excessive calcium loading via over-activation of N -methyl- d -aspartate (NMDA) and alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid...

...Monica D. Poteat; David B. Buchwalter Calcium sequestration in the hypo-osmotic freshwater environment is imperative in maintaining calcium homeostasis in freshwater aquatic organisms. This uptake process is reported to have the unintended consequence of potentially toxic heavy metal (Cd, Zn...

... in organismal stress tolerance cannot be underestimated. At a molecular level, multiple cell-specific signalling pathways including cyclic cAMP, cyclic cGMP and calcium modulate tissue, and hence, organismal responses to stress. Thus, epithelial cell-specific signal transduction can be usefully studied...

... . Jackson   D. C. ( 2004 ). Surviving extreme lactic acidosis: the role of calcium lactate formation in the anoxic turtle . Respir. Physiol. Neurobiol.   144 , 173 - 178 . Jackson   D. C. , Ultsch   G. R. ( 1982 ). Long-term submergence at 3°C of the turtle, Chrysemys picta bellii...

... of animals, while behaviour determines which environments are encountered. Here, we identified changes in the behavioural selection of external salinity in Fundulus heteroclitus , an estuarine teleost, as a consequence of digesting a meal. Fish that consumed high levels of dietary calcium exhibited a higher...

... levels: control, exposure to low calcium availability, predator kairomone exposure during training or a combination of low calcium and predator kairomones. Snails isolated during training alone demonstrated no difference in memory formation compared with the snails trained in groups. Maintaining snails...

...James R. Stewart; Tom W. Ecay; Benoit Heulin; Santiago P. Fregoso; Brent J. Linville SUMMARY The eggshell of oviparous lizards is a significant source of calcium for embryos, whereas the eggshell of viviparous lizards, when present, contains little calcium. In view of the potential cost...

.... The osphradium is an external sensory organ that demonstrates electrophysiological responses to a variety of external chemical stimuli. We examined the role, if any, played by the osphradium in sensing two environmental stressors, crowding and low environmental calcium, both known to block LTM in intact animals...

...Peter J. Allen; Dirk Weihrauch; Vanessa Grandmaison; Patricia Dasiewicz; Stephan J. Peake; W. Gary Anderson Calcium metabolism and mRNA levels of the epithelial calcium channel (ECaC) were examined in a freshwater cartilaginous fish, the lake sturgeon Acipenser fulvescens. Lake sturgeon were...

... © 2011. 2011 calcium diffusion metabolism mitochondria muscle nuclei Physiologists have a long history of evaluating the role of diffusion in cellular metabolism, particularly with respect to the necessity for O 2 transport from the blood into cells for aerobic metabolism. Indeed...