Introduction Highly pathogenic avian influenza (HPAI) is a markedly contagious viral disease of domestic chickens and turkeys, characterized by severe illness with high morbidity and mortality (Easterday et al. 1997). Human infections with the HPAI virus H5N1 frequently cause death since 1997 (Class et al., 1998, Subbarao et al., 1998). Two surface glycoproteins, the haemagglutinin (HA) and neu...

Mammalian extra-embryonic lineages perform the crucial role of nutrient provision during gestation to support embryonic and fetal growth. These lineages derive from outer trophectoderm (TE) and internal primitive endoderm (PE) in the blastocyst and subsequently give rise to chorio-allantoic and visceral yolk sac placentae, respectively. We have shown maternal low protein diet exclusively during...

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...

I n the accompanying paper of this series (1), some experiments are presented in which the simultaneous inoculation of two distinct strains of influenza A virus into the allantoic sac resulted in the appearance of a new kind of virus containing some of the antigens from both strains. The present communication deals with the cultivation of this new form in the allantoic sac and tells of the reco...

Razdan, P. 2003. Stress and early pregnancy in sows Effect on endocrinology, ova transport and embryo development Doctoral dissertation. Mixing unfamiliar breeding female pigs creates stressful situations due to aggressive interactions, which can lead to food deprivation of the more submissive animals. The aim of this thesis was to study the type of stress occurring when sows are regrouped into...

The ureides, allantoin and allantoic acid, represented major fractions of the soluble nitrogen pool of nodulated plants of cowpea ( Vigna unuiulata [L.] Walp. cv. Caloona) throughout vegetative and reproductive growth. Stem and petioles were the principal sites of ureide accumulation, especialy in early fruiting. Labeling studies using 14C02 and 15N2 and incubation periods of 25 to 245 minutes ...

background and aims: infectious bronchitis virus (ibv) causes an acute, highly contagious respiratory and kidney disease of chickens which results in significant economic losses in commercial broilers, layers and breeders. rapid identification of ibv serotypes involved in respiratory complex is a problem in the differential diagnosis. materials and methods: in this study, a single and multiplex...