In an attempt to define the molecular events involved in induction of interferon, various parameters of chick cells infected with human adenovirus type 5 were analysed. It was shown by digestion with various proteolytic enzymes and by disruption of the purified virus that induction of interferon requires the interaction of infectious virus with the chick cells. Analysis of adenovirus-infected c...

Anthropogenic disturbance has been demonstrated to affect the behavior of beach-nesting birds, yet energetic consequences recreational activities have received less attention. Because precocial chicks are often displaced as a result events, lower access food may lead fitness. We studied influence site characteristics and human on behavior, habitat use, growth rate, survival piping plover in New...

By a method of differential centrifugation and tryptic digestion suspensions of elementary bodies have been prepared from chorioallantoic membranes of chick embryos infected with vaccine virus. The infective titer of the final suspension of elementary bodies was usually the same as that of the original tissue emulsion. Elementary bodies from infected chick membranes were agglutinated as well by...

Teeth were lost in birds 70-80 million years ago. Current thinking holds that it is the avian cranial neural crest-derived mesenchyme that has lost odontogenic capacity, whereas the oral epithelium retains the signaling properties required to induce odontogenesis. To investigate the odontogenic capacity of ectomesenchyme, we have used neural tube transplantations from mice to chick embryos to r...

We have isolated the cDNA of avian Mox2 and analyzed its expression pattern during somitogenesis and limb bud formation. Mox2 plays an important role in limb muscle differentiation in the mouse. Mox2 is expressed in the somites of developing chick embryos and in presumptive migrating myoblasts from the dermomyotome to the limb buds. It is also expressed in the ventral and dorsal part of limb bu...

Pituitary adenylate cyclase-activating polypeptide (PACAP38) and vasoactive intestinal peptide (VIP) were tested for their ability to influence protein kinase C (PKC) activity in the chick cerebral cortical slices. Thirty minutes incubation of the chick tissue with PACAP38 (0.1-1 microM) or VIP (0.3-3 microM) produced significant and concentration-dependent changes in PKC activity. Both peptide...

Topographically graded molecules representing position-specific differences among otherwise similar cells are thought to play a role in the patterning of the developing nervous system. In the embryonic chick visual system, a 40 kDa protein, TOPAP, is expressed in a posterior > anterior gradient in the retina and in an inverted anterior > posterior gradient in the optic tectum, the major retinal...

In the present paper, the diencephalic origin of the chick pineal gland was analyzed by a series of experiments: prosencephalic substitution; in vitro culture of isolated diencephalons; and total or partial excission of the diencephalic roof. The results indicate that the differentiation of the chick pineal gland in the rooof of the third ventricle is not influenced by the neighbouring brain ve...