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The article reviews the latest work that illustrates how metabolic pathways are regulated in proliferating cells to generate some of the key molecules needed to support growth. It further discusses how genetic and environmental factors can influence the regulation of said pathways to promote cell proliferation in different contexts. It suggests that metabolism is actively regulated to facilitate a metabolic program that enables cells to adapt to physiological situations.

We report the growth and characterization of both n-type and p-type doped hydrogenated amorphous silicon films prepared by laser-induced chemical vapor deposition. For both doping types, the activation energy for electrical conduction has been reduced to below 0.2 eV and controlled doping has been achieved. Phosphine lowers the growth rate, while diborane has essentially no effect on the laser-induced growth but enhances thermal growth. Diborane also decreases the hydrogen concentration of the films, resulting in reduced optical gaps. [ABSTRACT FROM AUTHOR]