UDP-glucuronyltransferase activity of neonatal-chick liver or phenobarbital-treated chick-embryo liver catalysed the glucuronidation of 1-naphthol, 4-nitrophenol and 2-aminophenol. Only low transferase activity towards testosterone was detected, and activity towards bilirubin was not detectable. Liver microsomal transferase activity towards the three phenols was increased approx. 20-50-fold by ...

The present study showed that the HIS-C7 monoclonal antibody, which recognizes the chick form of CD45, is a specific marker for macrophages/microglial cells in the developing and mature chick central nervous system (CNS). HIS-C7-positive cells were characterized according to their morphological features and chronotopographical distribution patterns within developing and adult CNS, similar to th...

Effective long-term wildlife conservation planning for a species must be guided by information about population vital rates at multiple scales. Greater sage-grouse (Centrocercus urophasianus) populations declined substantially during the twentieth century, largely as a result of habitat loss and fragmentation. In addition to the importance of conserving large tracts of suitable habitat, success...

Pituitary adenylate cyclase-activating polypeptide 38 (PACAP38) is a potent activator of cyclic AMP formation in the chick brain. The peptide also stimulates inositol phosphates accumulation and protein kinase C (PKC) activity in the chick cerebral cortex. In this work, we analyzed whether PACAP38-induced increase in cyclic AMP production in the chick cerebrum can be modified by a PKC pathway. ...

A chick genomic clone that reveals a high degree of homology to the mammalian and Xenopus bFGF gene has been isolated. The pattern of expression of bFGF has been examined during early chick embryogenesis. RNA blot analysis revealed that chick bFGF is already transcribed at pregastrula stages. Immunolabeling analysis indicated that bFGF protein is present at these early developmental stages and ...

In 1951 Viktor Hamburger [4] and Howard Hamilton created an embryonic staging series from a combination of photographs and drawings from other researchers. The Hamburger?Hamilton stages are a sequence of images depicting 46 chronological stages in chick [5] development. The images begin with a fertilized egg [6] and end with a fully developed chick [5]. The Hamburger-Hamilton staging series was...

Wound closure in the ectoderm of Xenopus early neurulae and chick primitive-streak embryos has been studied by scanning electron microscopy (SEM). Initial gaping of the wound and a cobble-stone appearance of cells peripheral to the wound in both Xenopus and chick confirm that the ectoderm is under lateral tension at these stages. Healing is rapid: in Xenopus embryos wound closure has started wi...

In a previous study (Harris & Cook, 1969) it was shown that when a chick erythrocyte nucleus was introduced into the cytoplasm of a mutant mouse cell lacking the enzyme inosinic acid pyrophosphorylase (IMP: pyrophosphate phosphoribosyl transferase, E.C. 2.4.2.8.), synthesis of this enzyme was induced. However, it was not certain whether the enzyme induced in this way was mouse or chick enzyme, ...

When a chick erythrocyte nucleus is introduced into the cytoplasm of a mouse cell it undergoes reactivation and eventually determines the synthesis of chick-specific proteins in the cytoplasm of the heterokaryon. It has previously been shown that there is a close temporal correlation between the onset of synthesis of the chick-specific proteins and the appearance of nucleoli in the erythrocyte ...

the chick model is a useful research tool to investigate the development of the enteric nervous system (ens). recognition of appropriate markers for detection of chick enteric ganglia will allow better utilization of this model to study abnormalities of the ens. this study aimed to validate a set of antibodies for avian ens studies on wax sections. the specimens were taken from jejunum and colo...