共查询到20条相似文献，搜索用时 31 毫秒
5.
9.
11.
12.
13.
14.
16.
17.
The entomogenous nematode,Steinernema carpocapsae was applied in three forms in two fields cultivated with cotton and tomato, under each cotton seedling or tomato plant: a
bait like form, a suspension and in irrigation water. High concentrations of 2000 and 1000 IJS/seedling induced 100% mortality
(after 5 days), while lower concentrations showed the same result but after 15 days or later.
Under all doses of nematode, bait form application was more effective than suspension or irrigated water. 相似文献
18.
Male feral pigeons were dosed with ring-labeled and the tissues and droppings analyzed for total 14C, extractable 14C, and metabolites. Only 16% of an intraperitoneal dose of 1.5–2.2 mg kg?1 was voided in the droppings over 28 days; the rate of loss reached a maximum on the 14th day and then fell quickly away. The rate of removal of 14C in droppings was low in comparison to that found in the rat and the Japanese quail. When pigeons were dosed with 32–38 mg kg?1 DDT per bird, and killed after 77 days, 5.4% of the dose was eliminated in droppings and 87% was recovered in the body. The tissues and droppings from this experiment were analyzed for DDT and its metabolites. Of the 14C remaining in tissues 88% was accounted for as the apolar compounds DDE, DDT, and DDD. Approximately half of the 14C in droppings was present as DDE, DDT, and DDD, whereas 27–35% was apparently in conjugated form, extractable from aqueous solutions by ethyl acetate after prolonged acid hydrolysis. Two polar metabolites were isolated from the acid-released material. One was p,p′-DDA; the other was extractable from aqueous solution at pH 8 and was tentatively identified as a monohydroxy derivative of p,p′-DDT. DDE accounted for 93% of the 14C present as metabolites in tissues and droppings, clearly indicating the importance of this intermediate in this study. The metabolism of DDT in the feral pigeon is discussed in relation to its metabolism by other species. 相似文献
19.
The entomogenous nematode,Steinernema carpocapsae was applied in three forms in two fields cultivated with cotton and tomato, under each cotton seedling or tomato plant: a bait like form, a suspension and in irrigation water. High concentrations of 2000 and 1000 IJS/seedling induced 100% mortality (after 5 days), while lower concentrations showed the same result but after 15 days or later. Under all doses of nematode, bait form application was more effective than suspension or irrigated water. 相似文献
20.
A new pigment, 3,3′-biflaviolin (3,3′-bi-2,2′,5,5′,7,7′-hexahydroxy-1,1′,4,4′-naphthoquinone), was identified from agar cultures of the fungus Thielaviopsis basicola treated with the fungal melanin inhibitor, tricyclazole. An albino mutant of T. basicola that does not form melanin or colored melanin shunt products, synthesized 3,3′-biflaviolin when treated with flaviolin. The dimerization reaction appeared to be enzymatic. 相似文献