The CatSper channel: a polymodal chemosensor in human sperm.

The sperm-specific CatSper channel controls the intracellular Ca(2+) concentration ([Ca(2+)](i)) and, thereby, the swimming behaviour of sperm. In humans, CatSper is directly activated by progesterone and prostaglandins-female factors that stimulate Ca(2+) influx. Other factors including neurotransmitters, chemokines, and odorants also affect sperm function by changing [Ca(2+)](i).

[Is it possible to predict approval of medical rehabilitation by the extent of fatigue and subjective need for rehabilitation? Development, results and acceptance of a short screening].

Objectives: In earlier studies the lack of correlation between subjective need for rehabilitation of the applicant and the medically determined objective need for rehabilitation was reported again and again. The correlation between fatigue and subjective need for rehabilitation was not yet examined so far. Nevertheless fatigue is not defined sufficiently in the ICD, so interactions between chronic fatigue and somatic diseases are not taken into account appropriately.