Sertoli cells have receptors for follicle stimulating hormone (FSH) and testosterone which are the main hormonal regulators of spermatogenesis. Hormones such as testosterone, FSH and luteinizing hormone (LH) are known to influence the germ cell fate. Their removal induces germ cell apoptosis.
In very basic terms, ISO is the level of sensitivity of your camera to available light. The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera. The component within your camera that can change sensitivity is called âimage sensorâ or simply âsensorâ.
If your ISO option is greyed out or unavailable, try setting your camera to Program (âPâ) mode, or to a partially-manual mode such as Aperture-priority (âAâ or âAvâ), Shutter-priority (âSâ or âTvâ), or fully-Manual (âMâ). What is ISO â How to Use ISO on Digital and Phone Cameras was last modified: August 11th, 2013 by.