The survival rate is 75%～90% in the annual culture period. Since 1989,the salamander have spawned for successively 10 years by means of artificial propagation,and since 1991 salamander fry have been hatched artificially in successively 8 years.
The results indicated that in method 2 the outline of mouse blastocyst and hatched blastocyst cell ball was clear, the cleft of cell was obvious, its rate of observation was 94.7% and 96.8% respectively;
The rate of oxygen consumption and weight progressively increased within 70 days after hatching.
After hatching, it increased but then decreased to a certain level, which remained constant to the end of the studied period.
We observed unidirectional changes in the mass-specific rate of oxygen consumption and specific weight gain during embryonic development and this pattern was maintained after hatching.
The Species Specificity of Hatching Enzyme and Its Effect on the Duration of Embryogenesis in the Fish Cichlasoma nigrofasciatum
The density of mitochondrial profiles increases during embryogenesis and decreases after hatching, while their mean size increases, especially in the oxidative fibers, but it somewhat decreases in 6-month old chicks.
After 24h incubation, cellular DNA was isolated and analyzed for BP-derived DNA adducts by 32P-postlabeling technique.
Cell incubation experiments show that PLA-PU has biocompatibility comparable to that of pure PLA.
We studied the effects of nitrogen source, initial pH, temperature, incubation time, medium composition, and surfactants on cellulase production.
The only known Early Cretaceous bird embryo fossil has shown that precocial birds had occurred prior to altricial birds in avian history, and the size of the embryo and other analysis indicate it probably had a short incubation period.
Individuals of the species in pair-banding and nest-detecting periods have larger home ranges than those in incubation and rearing periods.
The survival rate of the embryos was estimated by their capacity to develop in vitro to the blastocyst or hatched blastocyst stages.
The rate of embryo survival was estimated according to their capacity to develop to the stages of blastocyst and blastocyst hatched from zona pellucida.
Since the effects of the mutations examined are expressed only at the previtellogenetic stages of oogenesis, only newly hatched (0-5-hour-old) females, whose oocytes did not develop farther than stage 7, were irradiated.
The newly hatched larva has preoral and postoral ciliary bands, which can be compared with the corresponding ciliary bands of dipleurula and with the prototroch and metatroch of trochophore larvae.
Viable larvae hatched from egg masses at a salinity of 24-26‰.