منابع مشابه
Comparative placental morphology and function.
The distinction between histiotrophic nutrition (in which local macromolecules are chiefly responsible for the maintenance of the embryo) and hemotrophic nutrition (which results from a transfer of material between the maternal and fetal circulations) is made. Placentation in a number of commonly used laboratory animals and in man is described, and it is shown that dependence upon histiotroph a...
متن کاملA comparative study on multivariate mathematical morphology
The successful application of univariate morphological operators on several domains, along with the increasing need for processing the plethora of available multivalued images, have been the main motives behind the efforts concentrated on extending the mathematical morphology framework to multivariate data. The few theoretical requirements of this extension, consisting primarily of a ranking sc...
متن کاملComparative evolution of flower and fruit morphology.
Angiosperm diversification has resulted in a vast array of plant morphologies. Only recently has it been appreciated that diversification might have proceeded quite differently for the two key diagnostic structures of this clade, flowers and fruits. These structures are hypothesized to have experienced different selective pressures via their interactions with animals in dispersal mutualisms, re...
متن کاملComparative Morphology of Nucleolar Dna in Drosophila
When viewed in historical perspective, as has recently been done by Schu]tz (29), studies of the nucleo]us are seen to have had as a pivotal point the relationship between nucleoli and chromosomes. For this reason, students of the nucleolus have been much interested in recent reports of D N A within nucleoli. One such report (21) described DNA-con ta in ing elements in the nucleoli of the saliv...
متن کاملComparative female reproductive tract development and morphology
A brief description of the basic pattern of mammalian organogenesis of the female reproductive tract is presented based on events as they occur in human beings. The emphasis is not on the details of this development, but rather its organization and timing. Tables of comparative development provide a comparison of similar events between man, rat, mouse, and chick.
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ژورنال
عنوان ژورنال: Science
سال: 1886
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.ns-8.204s.638