(1) Early diagnosis, high rate of survival of light-for-date babies and babies with congenital heart defect, and, possibly, exogenous factors working on gametogenesis might be an explanation.
(2) These data show that spectrin is present in all stages of gametogenesis and embryogenesis, except in mature spermatozoa; and that it undergoes cytoplasmic redistribution during morphogenesis.
(3) Mutations at the white spotting locus (W) affect various aspects of hematopoiesis, melanogenesis and gametogenesis during development and in the adult animal.
(4) A possible chromosome segregation disturbance in gametogenesis due to senescent changes of heterochromatic regions is discussed.
(5) In males, both plasma T and 11-KT initially increased in November and then showed further increasings during the rest of the period of gametogenesis (December) to reach their peak levels in the first half of the spawning period (end of January).
(6) If the right to gametogenesis is restricted, then every replicator symbiont and nuclear genome alike and hence every cell of the developing embryo, will have an incentive to compete.
(7) Males cultured for several years at 18 degrees C expressed a stable sexual phenotype when induced to undergo gametogenesis; males remained male.
(8) Synchronous gametogenesis in the water mold Allomyces arbuscula is blocked by actinomycin D added at the onset of the process.
(9) Sl and W mutations affect the same cellular targets in melanogenesis, gametogenesis and hematopoiesis during embryonic development and in adult life.
(10) These results are considered as nonrandom in pathology of male gametogenesis.
(11) for 21 days led to insignificant changes of plasma FSH, LH, PRL and T along with unaltered activities of testicular delta 5-3 beta-HSD, 17 beta-HSD activities and gametogenesis.
(12) Temperature shift experiments and antibiotic studies have indicated that this gene is expressed within 6 hr after the onset of gametogenesis in liquid culture, and its product has a lifetime of about 4 hr at 35 degrees.
(13) Fundamental animal studies by pioneers, such as Chang, Thibault and Edwards, taught us nature's axioms for gametogenesis, fertilization, development and differentiation.
(14) Northern blot analysis revealed that steady-state levels of the 2.4-kilobase GLE mRNA increased during growth and mitotic cell division in the vegetative cell cycle and also increased markedly during gametogenesis under nitrogen-starved conditions.
(15) Thus, it appears that the processes of hematopoiesis, melanogenesis, and gametogenesis in mammals involve a similar strategy to that used in other species for transmitting and receiving positional cues during development.
(16) In nearly all animals, the regulation of germinal cell development is postulated to be mediated through the control of gonadal somatic cell functions, associated with the creation and maintenance of an optimal milieu within the spermary of seminiferous tubule in which gametogenesis takes place.
(17) During gametogenesis RNA is de novo synthesized and becomes associated with the polyribosomes.
(18) Reproduction is a complex, stepwise series of processes that begins with gametogenesis, continues through gamete interaction, implantation, embryonic development, growth, parturition, and postnatal adaptation, and is completed with the development and sexual maturation of the newly formed organism.
(19) In this study, the patterns of expression of inhibin alpha-subunit mRNA during mouse gametogenesis were examined by RNA blot, cytoplasmic dot and in situ hybridization techniques.
(20) The relationship between allophanate lyase induction and gametogenesis is discussed.
Spermatogenesis
Definition:
(n.) The development of the spermatozoids.
Example Sentences:
(1) An effective gonadal shield should reduce the gonadal dose to a level low enough to preserve spermatogenesis in most patients.
(2) The findings support our earlier suggestion that the kinetics of spermatogenesis in the quail are fundamentally similar to the pattern which has been described for mammals.
(3) Combined with histological analysis, these results suggest a more rapid recovery of normal spermatogenesis after physical insult with LAC treatment.
(4) The effect of the mutation for white belly spot controlled by the dominant gene W on spermatogenesis in mice was examined by experimental cryptorchidism and its surgical reversal.
(5) After 35 and 43 days, spermatogenesis was complete in 99.6% of the tubular cross sections, and most tubular cross sections were in stages IV-VII of the cycle of the seminiferous epithelium.
(6) The morphological process of spermatogenesis is largely unaffected and motile sperm are produced, but meiocyte aneuploidy is common.
(7) These results demonstrate that administration of a GnRH antagonist in the presence of constant serum T levels does not induce consistent azoospermia, and that the supporting effects of T on spermatogenesis cannot be explained exclusively on the basis of the testicular androgen concentrations.
(8) These injections suppressed peripheral FSH levels to 6% of the control values, suggesting that FSH might be the modulator of the effects on spermatogenesis.
(9) It is concluded that this new method of administration may have practical and pharmacokinetic advantages for the purpose of reversible inhibition of spermatogenesis.
(10) Whether this mechanism is thermoregulatory for the normal spermatogenesis cannot be inferred from the present work.
(11) The nuclei were isolated from boar spermatid or sperm cells at three distinct stages of spermatogenesis: just before the completion of a maturation process in the testis (late spermatid), immediately after a subsequent transformation into spermatozoa (caput spermatozoon), and after full maturation (cauda spermatozoon).
(12) Considering that chromatin reorganizations during spermatogenesis may be directly or indirectly related to changes of the nuclear lamina we have decided to further investigate lamin expression during this process.
(13) In addition, there is significantly less germ cell production from the primary spermatocyte stage of spermatogenesis onwards and the total number of Sertoli cells observed is less.
(14) An alternative explanation, that there may be a pre-existing defect in spermatogenesis, was tested in 20 post-pubertal males with acute torsion.
(15) In this study, we document the presence of significant mRNA levels for 5 different PKA subunits (RI alpha, RI beta, RII alpha, RII beta, and C alpha) in germ cells and demonstrate differential expression patterns for these subunits during spermatogenesis.
(16) While the results reflect antiandrogenic and antispermatogenic action of V. rosea, the selective retention of the spermatogonia provides scope for the much desired revival of spermatogenesis on cessation of the treatment.
(17) The solvent alone, hydroxypropyl cellulose, had some inhibitory effect on spermatogenesis.
(18) The regulation of cellular growth is essential in the developing testis and is required for the maintenance of spermatogenesis in the adult testis.
(19) Analysis of data on the influence of different metals (cadmium, cobalt, molybdenum) on the Drosophila melanogaster cells has revealed a considerable genotoxic effect of cadmium salts which manifests in the high percentage of cells elimination at the early stages of spermatogenesis--the premeiotic cells.
(20) Changes in the mode of DNA packaging in nuclei during spermatogenesis were studied by measuring of the fluorescence anisotropy decay of an ethidium dye intercalated in the DNA in whole nuclei.