разработка технологических процессов шаровой мельницы. The ball mills produced in China are widely used in cement, coal, power plant desulfurization, metallurgy, chemical industry, non-metallic minerals, building materials, ceramics, etc. Wide range of …
The Knudson hypothesis, also known as the two-hit hypothesis, is the hypothesis that most tumor suppressor genes require both alleles to be inactivated, either through mutations or through epigenetic silencing, to cause a phenotypic change. It was first formulated by Alfred G. Knudson in 1971 and led indirectly to the identification of tumor suppressor genes.