1. An increase ofglutamic dehydrogenase (GDH) activity in yolk of the hen's egg has been shown to occur in the mid-incubation period. 2. Generally, the levels of GDH in embryonic tissues are less than those of tissues ofthe hen except for the blastoderm and 2-day-old embryo, which have GDH levels as high as those ofsomehen tissues. 3. GDHhasbeenfoundtoincreaseparipa88uwith total protein in the ...

1. 14 day old chick embryos are protected against subsequent meningococcus infection through the amniotic route by the intravenous administration of an homologous antiserum produced in hens, by a commercial concentrated polyvalent meningococcus antiserum and by a commercial meningococcus antitoxin. 2. Titrations of the different antisera indicate that the homologous and commercial polyvalent se...

The glycoconjugates sugar residues content, distribution and changes in the enterocytes of different tracts of the developing intestine of the chick embryo and of 1-day-old chick were investigated, using a battery of seven HRP-conjugated lectins (DBA, SBA, PNA, WGA, ConA, LTA and UEAI). The results of the present research have shown the presence of a large amount of glycoconjugates sugar residu...

The rho globin is the major beta-like chain found in 5-day-old chick embryos. In association with two unique early embryonic alpha-like globins, it forms the two major hemoglobins of early chick development. This paper presents the complete amino acid sequence of the rho globin. There are no amino acid differences between the rho chain and the adult chicken beta chain at known Bohr effect or or...

Dactylaria constricta var. gallopava (Cooke) Salkin et Dixon was found to cause fatal encephalitis in a 28-day-old, captivity-bred snowy owl chick (Nyctea scandiaca). The previously healthy bird suddenly developed ataxia, severe torticollis, and extensor rigidity of the legs. Since the animal did not improve with antibiotic or vitamin-mineral supplement therapy, the chick was euthanized 5 days ...

The following viruses were used in the form of pre­ parations purified from infected allantoic fluids by two cycles of alternate low (3,000 x g, 20 mins.) and high speed centrifugations (conditions are given in parenthe­ ses) : Inhibitor resistant variant of A 2 (Singapore) 57 influenza virus (48,000 x g, 40 mins.), previously puri­ fied by adsorption onto and elution from rooster red blood cel...

horbar; Ovaries from decapitated, sham-operated and intact 18-day-old chick embryos were cultured in Medium 199 for 6 h, and the amount of 17f3-estradiol released into the culture media was determined by radioimmunoassay. Ovaries from decapitated embryos secreted significantly lower amounts of 17f3-estradiol than those from intact embryos, but there was no difference when they were compared to ...

Youngner, Julius S. (University of Pittsburgh, Pittsburgh, Pa.), and Marion E. Kelly. Inhibition by exogenous interferon of replication of poliovirus ribonucleic acid in chick brain. J. Bacteriol. 90:443-445. 1965.-The replication of poliovirus was studied after the intracerebral inoculation of infectious ribonucleic acid (RNA) into the brains of 2-day-old chicks; these animals are not suscepti...

the purpose of this experimental study was to evaluate the effect of chicken amniotic fluid (af) on a cross section of rat sciatic nerves. thirty adult male sprague-dawley rats weighing 275 to 300 g, were randomized into three groups treated with (1) amniotic fluid or af (n=10), (2) normal saline or ns (n=10), and (3) sham surgery (n=10). the af was aspirated from the amniotic cavity of incubat...

in order to adapt lasota strain of newcastle disease virus (ndv) on chick embryo fibroblast (cef) cells, 0.1 ml from lasota vaccine produced in razi vaccine and serum research institute inoculated to the cef cells and was passaged five times in the cef grown in eagle’s minimum essential medium (mem). first to third passages were blind but in fourth passage cytopathic effect of virus was observe...