1. A study has been made of the relationship between 45Ca uptake into and hormone release from isolated rat neurohypophyses incubated in vitro. 2. Hormone secretion is triggered by high-K (56 mM) but long exposure to the stimulus does not generate a maintained release of hormone. 3. When hormone release began to wane, addition of Ba of La increased hormone output which suggests that the decline...

The endothelium is a highly active organ responsible for vasculatory tone and structure, angiogenesis, as well as hemodynamic, humoral, and inflammatory responses. The endothelium is constantly exposed to blood flow, sheer stress and tension. Endothelial cells are present as a vasculature in every tissue of the body and react to and control its microenvironment. A variety of ion channels are pr...

Zeolite application to clayey soils may change potassium (K) pools distribution and its release rate. To test this hypothesis, two heavy-textured calcareous soils with different mineralogy (smectitic and mixed by XRD) from southern Iran were selected. Experiment was a completely randomized factorial arrangement. Treatments consisted of two soils and two zeolite levels (0 and 5%) and wetting-dry...

The human body contains about 3,500mmol of potassium. Only about 2 per cent of this is in the extracellular fluid at any one time and the rest is intracellular. This 98 per cent is held in cells by a set of complex mechanisms and is pumped in and out of them by Na/K-ATPase pumps. Potassium has many biological functions. It is a co-factor for many enzymes and it is required for insulin secretion...

Invasive Acacia species can alter nutrient cycling processes in forest ecosystems, particularly affecting total litterfall production and litter decomposition patterns. This study examined the effects of exotic mangium Willd. on production, concentrations leaf fractions, decomposition, release lowland heath (HF) mixed dipterocarp forests (MDF) Brunei Darussalam, Borneo. Above-ground traps were ...