
U205 Solid state relay
Features:
Non-junction switch, long usage life
Controlling voltage among 3-5V, controlled voltage can reach to 380V
100% Factory Tested.
Package:
Product ID dimensions: Net Weight Cross Weight
U205-A 110g
U205-B 10g
U205-C 310g
U205-D 20g
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pe of those who, for
the past 15 years, have been searching for ways of triggering that metabolic adaptation by means
other than semi-starvation.
The search for a drug that will stave off old age is itself as old as the hills—as is the wishful
thinking of the suckers who finance such efforts. Those who hope to find it by mimicking the effect
of calorie restriction are not, however, comple fuel dispenser te snake-oil salesmen, for there is known to be a
family of enzymes called sirtuins, which act both as sensors of nutrient availability and as
regulators of metabolic rate. These might provide the necessary biochemical link between starving
and living longer.
An elixir of life?
Boosting the activity of sirtuins in yeast, nematode worms and fruitflies (three rapidly reproducing
stalwarts of biological laboratories) does indeed result in longer lifespans. In 2003 a team led by
David Sinclair of Harvard Medical School described 19 plant-derived molecules that activate
sirtuins in yeast. One of these molecules, resveratrol, is found in red wine—which created
excitement among those who think that a wine-rich diet is part of the explanation for the healthy
old age apparently enjoyed by many who live in southern Europe.
In February, a group led by Dario Valenzano of the Scuola Normale Superiore in Pisa, Italy,
showed that the effect applies in vertebrates, too. Dr Valenzano s experiments with resveratrol
increased the maximum lifespan of a small fish, called Nothobranchius furzeri, by 60%.
(Nothobranchius furzeri was chosen because it is the fuel dispenser shortest-lived v fuel dispenser ertebrate known, with a
normal maximum lifespan of 12 weeks.)
Resveratrol, however, is only a starting point. Sirtris Pharmaceuticals, a firm based in Cambridge,
Massachusetts, of which Dr Sinclair is a co-founder, has identified a number of synthetic molecules
whose effect on yeast is many times more potent than resveratrol s. Although there is, as yet, no
published evidence that sirtuins extend life in mammals, or that resveratrol activates