the effect of various host plants including chickpea (varieties arman, hashem, azad and binivich), common bean (variety khomein), white kidney bean (variety dehghan), red kidney bean (variety goli), cowpea (variety mashhad), and tomato (variety meshkin) on the reproductive performance and growth indices of the cotton bollworm, helicoverpa armigera (hübner) was determined under laboratory condit...

A technique for fertilizing zebrafish eggs by injection of sperm nuclei is described. Eggs that cleave normally can develop into swimming larvae and give rise to fertile adults. If sperm nuclei are preincubated for 20 min with DNA encoding the green fluorescent protein, transgene expression can be detected in all cells of the embryo. The use of condensed sperm nuclei allows injection with a sma...

Of 129 strains of the Hong Kong variant of influenza A2 virus isolated from 176 respiratory infections, 105 (81.4%) were isolated in tissue culture, the remainder being detected only by the inoculation of fertile hen's eggs. Organ cultures of chick embryo trachea were at least as sensitive as monkey kidney tissue culture for the isolation of this virus but organ cultures of human embryonic cili...

Environmental conditions influence hatchability of ostrich eggs as these include the length of the storage period, temperature, humidity, gaseous environment, and orientation of the eggs (MELLET, 1993). There is a decrease in hatchability of the egg during storage (MEIJERHOF, 1992). A study in poultry (BUTLER, 1991) suggests that longer storage delays hatch time and reduces chick quality and gr...

to investigate the influence of hypoxia during the early stage of incubation on embryonic developmentand hatching events, and consequently on incidence of ascites in broiler chickens, one thousand fertile eggswere incubated in two commercial incubators. half the eggs were incubated in a low altitude incubator untilhatched. the second half were incubated in a high altitude incubator until day 10...

Investigations on the biology of Phlebotomus papatasi were carried out under laboratory conditions at 28 +/- 2 degrees C and 80 +/- 1% RH. Fecundity of the female varied between 61 and 48 (mean 56.2 +/- 5.46) and the incubation period of eggs ranged from 7-9 (mean 7.81 +/- 0.61) days. The developmental duration of larvae and pupae varied from 24 to 31 (mean 28.57 +/- 2.71) and 9 to 11 (mean 10....

The effects of various levels of food deprivation on the oogenesis of P. megistus was studied. Immediately after the imaginal ecdysis, six groups (GI to GVI) of 15 couples each were formed. Each group was fed as follows: GI -- on days 5 and 25; G-II -- on days 5 and 35; GIII -- on days 5 and 45; GIV -- on day 20; GV -- on day 30; GVI -- on day 40 after the imaginal ecdysis. After the establishe...