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.
Increasing the ISO setting means you can carry on using safe shutter speeds for handheld photography, or successfully freeze fast action, which is a major boon for sports and action photographers working indoors or in bad light. How to get a good camera deal on Black Friday; ISO and noise. But increasing the ISO setting has a downside.