نتایج جستجو برای: predatory stress
تعداد نتایج: 444002 فیلتر نتایج به سال:
The effects of a precipitous decrease in the inlet organic loading rate on sludge reductions and the microbial community in a membrane bioreactor were investigated. The sludge biomass was markedly reduced to 47.4% of the initial concentration (approximately 15,000 mg L(-1)) within 7 d after the organic loading rate was decreased by half (450 to 225 mg chemical oxygen demand L(-1) d(-1)). An ana...
The biology of predatory fly, Leucopis glyphinivora Tanas. was studied under greenhouse conditions. Adult longevity was 8 days and the average fecundity was 35.7 eggs. Incubation period, the 1st, 2nd, 3rd larval instars and puparium duration averaged 2.7, 2.16, 3.48, 5.7 and 8.45 days, respectively. Each generation lasted about one month. The predator efficiency was studied by applying the egg ...
This paper studies the equilibrium predatory practices that may arise when the borrowers have behavioral weaknesses. Rational lenders offer short term contracts that can be renewed at the cost of paying a penalty fee. We show how the optimal contracts depend on the degree of näıveté of the time inconsistent customers. Penalty fees have a dual role : they increase market share by providing a use...
An investigation on the insects in the jujube ecosystem in Taigu District of Shanxi Province, Northern China showed that more species and individual numbers of pest, predatory and neutral insects were found on the tree than on the ground. The ratio of the species and individual numbers of predatory and neutral insects to those of pest insects fluctuated from year to year. Homoptera, Coleoptera ...
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