نتایج جستجو برای: yolk sac
تعداد نتایج: 20107 فیلتر نتایج به سال:
Unabsorbed yolk sacs are being investigated as a possible reservoir for internal Campylobacter and salmonellae contamination of processed poultry carcasses. However, it is unknown at what frequency that unabsorbed yolk sacs persist at the time of processing of broilers and spent breeders. Seven sets of 100 broiler carcasses (at 6 or 8 wk of age) were obtained from commercial processing plants. ...
Hepatoid variant of yolk sac tumor of ovary is an unusual tumor with an aggressive behavior. It is usually observed in young females, presents with abdominal complaints and is associated with raised α-fetoprotein (AFP) levels. It should be differentiated from other hepatoid tumors involving the ovary. A complete patient evaluation with gross, microscopy, and immunohistochemistry can identify th...
Purpose: Yolk sac hematopoietic stem cells (YS-HSC) have two dominant characteristices: a larger reproductive capacity and the absence of the expression of MHC associated antigens. Therefore, these cells are promising candidates for transplantation, cell therapy and gene manipulation. There are controversial reports on the effects of erythropoietin (EPO) on the differentiation of yolk sac cells...
The collagens associated with 14.5-d rat visceral yolk sacs were localized and identified by a variety of procedures. Morphological examination showed that both the visceral epithelium and mesothelium rested upon thin basement membranes, whereas the majority of the extracellular matrix consisted of a stroma containing occasional cells and abundant banded fibrils. Immunohistochemistry at the ele...
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