Cytological studies have shown that in the maturation divisions of a large number of species of animals the cells which are to give riseto the spermatozoa are of two kinds, differing from each other in the nature of their chromatin content. The resulting spermatozoa therefore are assumed to be likewise of two kinds. A large mass of indirect evidence makes it highly probable that eggs fertilized...

The freshwater prawn Macrobrachium acanthurus represents a valuable resource for fishermen's communities in Mexico, although the information of its culture conditions and nutrition is still scarce. Prebiotics are defined as non-digestible components that metabolized by specific health-promoting bacteria host's digestive system, improving health status growth performance cultured aquatic organis...

A single ribosomal protein (Mr, 32,000) becomes phosphorylated during progesterone-induced in vitro maturation of Xenopus laevis oocytes. The protein is identified as 40S ribosomal protein S6. Phosphorylation of S6 is monitored by incorporation of 32Pi and by two-dimensional polyacrylamide gel electrophoresis. S6 is minimally phosphorylated in unstimulated oocytes. After progesterone treatment,...

STUDY POPULATION. This study was a nonrandomized controlled, parallel-group intervention trial with an active study population of 50 consecutively enrolled children aged 5 to 18 years. The study children underwent egg OIT after confirming immunoglobulin (Ig)E-mediated egg allergy by using a double-blind, placebo-controlled egg food challenge (DBPCFC). The control group included 32 children who ...

In amphibians, as well as in other vertebrates, occytes start to mature under the action of hypophyseal gonadotropic hormones. (In this paper the term 'maturation' implies the transformation into ripe eggs of oocytes that have finished growing.) In the course of maturation the oocytes themselves and the follicle cells surrounding them undergo changes; the changes of these two cell types are not...

During amphibian o6genesis, small o6cytes in the first meiotic prophase undergo a prolonged growth period resulting in the formation of fully developed o6cytes which have greatly increased in size. The injection of a pituitary suspension into mature females stimulates the release of the full-grown o6cytes from the ovary and the breakdown of their large nuclei (germinal vesicles). The ovulated e...

The expression of the tight junction peripheral membrane protein, cingulin (140 x 10(3) M(r), was investigated in mouse eggs and staged preimplantation embryos by immunoblotting and immunoprecipitation. Polyclonal antibody to chicken brush cingulin detected a single 140 x 10(3) M(r) protein in immunoblots of unfertilised eggs and all preimplantation stages. Relative protein levels were high in ...

Pre-harvest male maturation is problematic for Atlantic salmon (Salmo salar) farmers and regulated by the environment genetics (e.g., vgll3). Five families of all-male parr (produced using YY males crossed with XX females) different vgll3 genotypes were split between three environmental regimes in January 2018. The “advanced maturation” regime used elevated temperature (16 °C) continuous light ...