Previous studies have documented a decrease in plasma calcium occurring early after trauma, haemorrhage and cardiac arrest. Therefore, changes in plasma calcium in an ovine experimental model of septic shock due to intraperitoneal sepsis were investigated. Subjects were volume-loaded with Ringer's lactate solution. Plasma calcium and albumin were measured before and 24 h after surgical inductio...

Brain or blood plasma melatonin was analysed as a measure for pineal melatonin production in sea bream. Access to calcium was limited by diluting the seawater to 2.5 per thousand and removing calcium from the diet or by prolonged feeding of vitamin D-deficient diet. Interactions/relations between melatonin and calcium balance and the hypercalcemic endocrines PTHrP and calcitriol were assessed. ...

Brain or blood plasma melatonin was analysed as a measure for pineal melatonin production in sea bream. Access to calcium was limited by diluting the seawater to 2.5& and removing calcium from the diet or by prolonged feeding of vitamin D-deficient diet. Inter­ actions/relations between melatonin and calcium balance and the hypercalcemic endocrines PTHrP and calcitriol were assessed. Restrict­ ...

To define the minimum and maximum levels for calcium concentration of dialysis fluid a combination of acute and long-term observations was carried outIn acute experiments the external calcium balance during dialysis was dependent on the gradient between plasma ultrafilterable calcium and dialysis fluid calcium concentration. Changes in plasma calcium during dialysis did not correlate with measu...

major proportion of intracellular calcium (ca 2+ ) is achieved through opening of calcium channels present in the plasma membrane which play an important role in regulating neuromuscular coordination and release of neurotransmitters from nerve terminals. blockade of these calcium channels adversely affect contractile process and release of neurotransmitters in majority of the neuromuscular prep...

OBJECTIVE To investigate the mechanism of calcium antagonist mediated cytoprotection against the damaging effects of adrenaline in vivo on cardiac myocytes and human endothelial cells from the umbilical vein. METHODS Human endothelial cells cultured from the umbilical vein and isolated rat cardiac myocytes were treated with plasma from rats given adrenaline 30 minutes previously with pretreat...

We have evaluated the effects of the following on ion.specific electrode measurement of calcium ion activity in plasma: blood or plasma was stored in various ways for various periods of time, or exposed to air, or small amounts of heparin were added to the blood. Blood may be stored for as long as 120mm at room temperature before calcium ion activitychanges measurably, but plasma stored for 20 ...

Juvenile gilthead sea bream were exposed to diluted seawater (2.5 per thousand salinity; DSW) for 3 h or, in a second experiment, acclimated to DSW and fed a control or calcium-deficient diet for 30 days. Branchial Ca2+ influx, drinking rate and plasma calcium levels were assessed. Sea bream plasma parathyroid hormone related protein (sPTHrP) was measured, and mRNAs of pthrp, its main receptor,...

Plasma calcium and inorganic phosphorus concentrations were significantly lower in 14 female rabbits during the last 20 days of pregnancy and the first 20 days of lactation than in 11 non-pregnant, non-lactating controls. Plasma magnesium level was similar in both groups. Plasma calcium and inorganic phosphorus levels were very low (5.8 +/- 0.4 and 2.9 +/- 0.3 mg/dl, respectively) in 6 lactatin...

Calcium plays a pivotal role in excitation-contraction coupling of cardiomyocytes and many other cellular responses observed in cardiovascular cells. Thus maintaining a healthy status requires very strict regulation of cytoplasmatic but also plasma ionized calcium concentration. Plasma ionized calcium is regulated by calcium sensing and the regulation of calcium uptake and secretion. Under cond...