Exempel på calcium

• A surplus of calcium brings on senility, as noted above. 

• Besides these four elements, living organisms commonly contain sulphur, phosphorus, chlorine, potassium, sodium, calcium, magnesium and iron. 

• Calcium and chlorine are rarer than on earth, sodium is somewhat commoner. 

• Lime also adds another plant food called calcium. 

• Normal blood albumen is essentially a compound of calcium and sodium into which iron and sulphur both enter. 

• Redundant mechanisms of calcium-induced calcium release underlying calcium waves during fertilization of sea urchin eggs.

• In the present work we wanted to verify whether oocytes recovered from preantral follicles were able to acquire calcium activity during follicle culture.

• It is uncertain, however, how a high concentration of calcium in the absence of lactate inhibits capacitation.

• Our results suggest that these metabolites are involved in diverse signalling pathways such as calcium release and cell cycle signalling.

• The calcium injection diminished the nonsaturating receptor potentials by about 70%, and in the ten cells tested, response amplitude was reduced 50 -80%.

• These include a regenerative sodium current, the potassium inward rectifier, potassium delayed rectifier and transient outward potassium current, and several calcium currents.

• In the present work we determined whether preantral follicle development in vitro also allows oocytes to acquire calcium signalling activity.

• Local perinuclear calcium signals associated with mitosis entry in early sea urchin embryos.

• Concentrations of calcium and manganese were positively correlated with each other and with elevation.

• However, little is known about which calcium channels are coupled to synaptic exocytosis of glycine, which is primarily released by amacrine cells.

• This small influx of calcium however triggers much larger release from storage sites within the cell, in a highgain process known as calcium-induced calcium release.

• To counteract the continued inflow of calcium, horizontal cells are endowed with calcium-regulating mechanisms common to other neuronal types.

• A scenario emerges from these studies in which calcium ions coordinate the structure of interhemichannel hydrophobic domains.

• Frequency encoding in excitable systems with application to calcium oscillations.

• The development of a general theory of frequency encoding in excitable systems by hormonal stimuli allowed the study of intracellular calcium dynamics.