نتایج جستجو برای: embryonic mortality
تعداد نتایج: 367170 فیلتر نتایج به سال:
insurers have in the past few decades faced longevity risks - the risk that annuitants survive more than expected - and therefore need a new approach to manage this new risk. in this dissertation we survey methods that hedge longevity risks. these methods use securitization to manage risk, so using modern financial and insurance pricing models, especially wang transform and actuarial concepts, ...
The aim of this study was to evaluate the toxicity of two rare earth elements (REE), cerium and lanthanum on sea urchin embryos and sperm. Sea urchin (Paracentrotus lividus) embryos were reared for 72 h in Ce(IV)- or La(III)-contaminated seawater at concentrations ranging from 10(-8) to 10(-5) M. Cleaving embryos (5h post-fertilization) were submitted to cytogenetic analysis, scoring mitotic ac...
the european court lifted the italian ban on pre-implantation diagnostics (pgd). as such the court accepted pgd as a generally accepted means for medically assisted procreation, which may have consequences for other member states prohibiting pgd.
BACKGROUND Temperature and relative humidity (RH) are very important factors affecting embryo development, hatchability, and posthatch performance. This study aimed at characterizing embryonic metabolic and behavioural response to a harsh incubation environment generated by manipulations (elevations and drops) in these two key factors. This study was aimed at establishing patterns of metabolic ...
In order to evaluate the effect of pre-incubation storage conditions on embryonic development and chick quality of Camperos breeders, 320 hatching eggs were selected. Before the incubation, they were kept for 4 days at a controlled storage and environment. Then, were kept for 21 days in the incubation process with the same technological conditions. Bioproductive performance on biological contro...
In marine turtles, the physical conditions experienced by eggs during incubation affect embryonic development. In the leatherback, hatching success is known to be low in relation to other marine turtles as a result of high embryonic mortality. Moreover, the hatching success on Yalimapo in French Guiana, one major nesting beach for this species, is lower compared to other nesting sites. We asses...
while our knowledge of anuran embryonic and larval surface ciliation and their diversity ofciliation patterns are significant, very few references were noticed on embryonic ciliation in direct-developinganurans, such as species in the genus eleutherodactylus. eleutherodactylus urichi embryos were found tohave surface ciliated cells during much of their development until a few days before hatchi...
Background and Aim: Embryonic stem cells are identified with two unique characteristics. First, they can be maintained and expanded as pure populations of undifferentiated cells, a characteristic which is known as self renewal aspect of embryonic stem cells. Second, these cells can give rise to all body cell types. In the current study, we used a feeder-free condition to differentiate mouse emb...
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