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.
Like shutter speed and aperture, ISO values correspond to exposure âstops,â with an increase of one stop being a doubling of the sensitivity. The relationship of ISO value to exposure stops is very straightforward: ISO 200 is a one-stop increase (doubling of sensitivity) over ISO 100.