The staphylococcal typing-phage 42 D is propagated on bacteria which are lysogenic for the phage 1363, and the latter phage is present as a contaminant in preparations of phage 42D. This contamination can be avoided by propagating a pure clone of phage 42D on non-lysogenic organisms. Such nonlysogenic propagating strains can be isolated after the lysogenic propagating organisms have been irradi...

an experiment was conducted to evaluate the effects of 1α-oh-d3 either with or withoutcholecalciferol, microbial phytase as well as different levels of dietary calcium, and phosphorus onbroiler chickens, performance. a number of 576 male broiler chickens (ross 308) were made use of ina completely randomized design of a factorial arrangement (3×2×2×3), comprised of 36 treatments, 4replicates of ...

Two independent trials were carried out to evaluate the effect of feed form, whole wheat (WW) and oat hulls (OH) addition on gastrointestinal (GIT) weight and Campylobacter jejuni colonization in orally infected birds. In Trial 1, there were six treatments factorially arranged with two feed forms (mash vs pellets), and three levels of WW from 1-21/22-42d: 0/0, 7.5/15%, 15/30%. Broilers were all...

Lactate dehydrogenase (LDH) was studied in phage-propagating strains 29, 3A, 6, 81, and 42D of Staphylococcus aureus selected from the five groups in the International-Blair series. Cells were cultivated in Brain Heart Infusion (Difco) under nearly anaerobic conditions and were harvested near the end of the log phase. LDH activity was maximal at the end of the exponential growth period and was ...

In the course of the routine examination of strains of Staphylococcus aureus isolated from outbreaks of staphylococcal food poisoning in north-west England, we were surprised to find that most of them were penicillin resistant. Nine of 11 strains, all present in large numbers in foods that had caused clinically typical outbreaks of vomiting and diarrhoea, were penicillin resistant. None of the ...

Background: Apoptosis is induced by several factors and has an important role in embryonic development. Since vitrification-induced embryonic damages could be resulted from an increase in apoptosis occurrence,the aim of the present study is to investigate the effect of vitrification on induction of apoptosis in blastocysts. Materials and Methods: For this purpose 20 balb-c mice superovulated an...

The present experiment was carried out to determine whether there is any relationship between the growth and the activity of serum lactate dehydrogenase (LDH) and the incidence of ascites in broiler chickens. Dietary treatments consisted of a control met NRC (1994) recommendations during 1-21 and 2142d and a skip-a-day feed removal with 24h fasting on 9, 11 and 13d. The skip-a-day feed restrict...