In their theoretical model of intergenerational transmissions of depression from mothers to offspring, Goodman and Gotlib (2001) argue that there are four dominant mechanisms through which depressive symptoms are transferred: heritability of depression, innate dysfunctional neuroregulatory, exposure to mother's negative behaviors and affect, and exposure to stressful environments. (interpersona.psychopen.eu)
«It could be that this is the dominant mechanism» for forming ammonia on the early Earth, says Chris Chyba, an early Earth expert at the Search for Extraterrestrial Intelligence Institute in Mountain View, California, and Stanford University. (sciencemag.org)