only when the compound capable of tautomerization is in the liquid phase, or in solution. And that is just the case with the free radicals under consideration. 6. The two radicals, a-naphthyl-diphenylmethyl and a-naphthylxanthyl, were found to give a molecular weight less than that calculated for the monomolecular phase. Schlenk and Renning's" results show that a-naphthyl-biphenyl-phenylmethyl ...

The latest memoir of the Society for Endocrinology presents the papers and discussions of a 1958 symposium on selected aspects of comparative and human sex morphology. It is gratifying that discussions of bacteria and invertebrate forms are included. Several authors examine the important question of genetic and hormonal controls of sex differentiation. The possibility of regulating the sex rati...

N Engl J Med 2004;350:367-78. Copyright © 2004 Massachusetts Medical Society. ex determination, which depends on the sex-chromosome complement of the embryo, is established by multiple molecular events that direct the development of germ cells, their migration to the urogenital ridge, and the formation of either a testis, in the presence of the Y chromosome (46,XY), or an ovary in the absence o...

Over the past 40 years, gonadal sex differentiation in teleost fish has been studied from histological and physiological viewpoints, for its application in fisheries. The morphological characteristics of gonadal sex differentiation in teleost fish were discussed in Section 2, and a summary of sexual processes, such as gonadal sex differentiation and sexual maturation in triploid salmonid fishes...

Freud (1905/1953) anchored his theories of unconscious psychological functioning in observations and inferences about childhood sexuality. These ideas remain influential among psychoanalysts today. Much progress subsequently occurred in extra-psychoanalytic research in human sexuality. This included the discovery in 1959 of an entirely new area of psychology: the sexual differentiation of behav...

Introduction. The main problem in teaching the processes of gender differentiation during practical classes is that all biochemical and genetically determined are insufficiently covered or detached from accompanying morphological transformations. Often, educational programs consist only topics highlight development a certain sex, avoiding questions - causes transformations.The purpose research ...

Recombination suppression leads to the structural and functional differentiation of sex chromosomes and is thus a crucial step in the process of sex chromosome evolution. Despite extensive theoretical work, the exact processes and mechanisms of recombination suppression and differentiation are not well understood. In threespine sticklebacks (Gasterosteus aculeatus), a different sex chromosome s...