The pattern of development of meningopneumonitis virus in the allantois of the chick embryo was described in a recently published report from this laboratory (1). The growth cycle of this virus was determined by titrating allantoic fluids and membrane suspensions, obtained at various intervals after the inoculation of virus, for infectivity in mice and chick embryos. The development of virus in...

Mouse conceptuses homozygous for mutations in brachyury (T) exhibit a short, misshapen allantois that fails to fuse with the chorion. Ultimately, mutant embryos die during mid-gestation. In the 60 years since this discovery, the role of T in allantoic development has remained obscure. T protein was recently identified in several new sites during mouse gastrulation, including the core of the all...

Abstract Female reproductive performance is essential for economic profitability of swine operations, and sex steroid hormones, such as progesterone (P4), are necessary proper function. Recent research targeting the microbiome in beef cattle found that P4 concentrations fluctuate during estrous cycle, bacterial communities tissues also change. However, characterizing relationship between within...

The sedimentation behavior of influenza virus in dilute solutions of electrolyte was found to be quite variable. At times the virus activity appeared to sediment at a rate comparable with that of particles about 80 to 120 mmicro in diameter, at other times at a rate comparable with that of particles about 10 mmicro in diameter, and at still other times the bulk of the activity appeared to sedim...

Avian influenza is an important disease of poultry with the potential to cause major epidemics resulting in significant economic losses. The presence of avian influenza viruses (AIV) in chickens in Iran has not been previously reported. An avian influenza outbreak in broiler, layer and breeder farms occurred during a very hot summer in July 1998. Three AIV isolates designated as 101, 102 and 10...

Despite its importance as the source of one of three major vascular systems in the mammalian conceptus, little is known about the murine allantois, which will become the umbilical cord of the chorio-allantoic placenta. During gastrulation, the allantois grows into the exocoelomic cavity as a mesodermal extension of the posterior primitive streak. On the basis of morphology, gene expression and/...