نتایج جستجو برای: germ
تعداد نتایج: 35661 فیلتر نتایج به سال:
In this work, we investigate the topological information captured by Euler obstruction of a map-germ, [Formula: see text], where text] denotes germ complex text]-equidimensional singular space, with and its relation local coordinate functions consequently, Brasselet number. Moreover, under some technical conditions on domain, relate Chern number special collection related to map-germ at origin ...
Background: Recent publications regarding the differentiation of stem cells to germ cells have motivated researchers to make new approaches in infertility. In vitro production of germ cells improves the understanding of differentiation process of male and female germ cells. Since using embryonic stem cells for this purpose has been associated with tumorogenesis and ethical criticisms, the men...
Primordial germ cells (PGCs) are highly specialized cell population that arises from the epiblast in vivo. There are three critical steps in the life cycle of these cells: 1-Specification 2-migration and proliferation 3-prenatal and postnatal sex specific development. Specification of germ cells in epiblast occurs due to signals secreted from extraembryonic tissues. Primordial germ cells are re...
Background and purpose: Germ cell tumor is the most common malignancy of men between 15-34 years of age. Proper treatment is highly dependent on accurate histologic diagnosis, and different markers such as cytokeratin, CD3, GPC3 and etc. were proposed. It was reported that GPC3 is over expressed in testicular germ cell tumors by micro array assay. The aim of this study was to evaluate the expre...
conclusions pc-rplnd is one the major operations in the field of urology, which is associated with significant adjunctive surgeries. in appropriate cases, pc-rplnd was associated with good cancer specific survival in tertiary oncology center. results twenty-one patients underwent bilateral pc-rplnd. mean age was 26.3 years (ranged 16 - 47). mean size of retroperitoneal mass after chemotherapy w...
diseases and emphasis on using nondrug treatments, this study was performed to assess the effect of wheat germ on lipid profile reduction among hyperlipidemia and normolipidomia students. Materials and Methods: 108 volunteer students in the age range of 21.33±2.15 years old (74 normolipidemics, 34 hyperlipidemics) were entered to the study. In addition to their typical diet, these students were...
germline and somatic stem cells are distinct types of stem cells that are dedicated to reproduction and somatic tissue regeneration, respectively. germline stem cells (gscs), which can self-renew and generate gametes, are unique stem cells in that they are solely dedicated to transmit genetic information from generation to generation. we developed a strategy for the establishment of germline st...
background: niche cells, regulating spermatogonial stem cells (sscs) fate are believed to have a reciprocal communication with sscs. the present study was conducted to evaluate the effect of ssc elimination on the gene expression of glial cell line-derived neurotrophic factor (gdnf), fibroblast growth factor 2 (fgf2) and kit ligand (kitlg), which are the main growth factors regulating sscs deve...
background: over recent decades a possible decrease in sperm quality and an increase in the incidence of testicular cancer have been reported in many populations. some recent findings, as cohort studies, showed an increased risk of testicular cancer in men with abnormal semen analysis. case: a 30 years old man referred to our clinic with chief compliant of infertility for 3 years. spermogram re...
We prove that a hyperbolic Dulac germ with complex coefficients in its expansion is linearizable on standard quadratic domain and the linearizing coordinate again germ. The proof uses results about normal forms of transseries [19].
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