• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 123
  • 97
  • 34
  • 16
  • 8
  • 8
  • 8
  • 8
  • 8
  • 8
  • 3
  • 3
  • 1
  • 1
  • 1
  • Tagged with
  • 364
  • 114
  • 74
  • 62
  • 56
  • 50
  • 28
  • 27
  • 26
  • 22
  • 22
  • 20
  • 20
  • 19
  • 19
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Factors determining the toxicity of pyrethroid insecticides to Spodoptera littoralis Boisd

Peace, E. A. January 1988 (has links)
The pharmacokinetics of a range of substituted benzyl -cyclopropane-l-carboxylates topically applied in acetone to adult mustard beetles, Phaedon cochleariae, and in Sirius mineral oil to larval Spodoptera littoralis were investigated with particular reference to tissue binding and distribution. A set of pyrethroids with a wide range of binding properties was applied to adult mustard beetles. The form of the pharmacokinetic profiles was obtained by exhaustive soxhlet extraction of the tissues. Binding varied with the physicochemical properties of the compounds. Two phases of binding were identified; rapid binding to cuticle occured within seconds of topical application, followed by a slower binding which proceeded to a maximum after several hours. When cypermethrin was applied to larvae of S. littoralis, two similar phases were observed; rapid binding which took place over the first hour was followed by a slower binding which continued at a constant rate for up to 72 hours after dosing. Increasing the viscosity of the carrier oil reduced the rate of penetration of cypermethrin into larvae of S. littoralis. The tissue concentration of cypermethrin when equilibrated throughout the larval tissues was related to the ratio of tissue solids to tissue water. This suggests that the distribution of insecticide in the tissue is determined by partition processes. All of the tissues without exception reached steady state within one hour of dosing and the tissue levels maintained thereafter. However, this pattern was not observed for the gut contents, where cypermethrin levels reached a peak after six hours. Thereafter cypermethrin disappeared - from the gut, presumably as material was eliminated or degraded. The gut appears to be the only important site of loss of cypermethrin from Spodoptera larvae. The toxicological implications of these results are discussed.
22

The development and use of polymorphic DNA markers for use in population studies of Oryzaephilus surinamensis

Brown, Richard James January 1996 (has links)
No description available.
23

Calibration of droplet spectra using fluorescent tracers and their use and quantification in spray experiments

Davies, G. January 1987 (has links)
No description available.
24

Wind tunnel studies on the collection of spray droplets by insects in flight

Gadalla, B. H. January 1984 (has links)
No description available.
25

ENHANCEMENT OF TOXICITY OF INSECTICIDES USING CHEMICAL ADJUVANTS.

Sivasupramaniam, Sakuntala. January 1984 (has links)
No description available.
26

The molecular genetic basis of insecticide resistance in the peach-potato aphid Myzus persicae (sulzer)

Field, Linda Mary January 1989 (has links)
No description available.
27

The host plant modification of malathion tolerance of Phaedon cochleariae and Myzus persicae including reference to the third trophic level

Smith, Lawrence J. January 1990 (has links)
No description available.
28

Structure and organization of esterase B1 amplification in Culex mosquitoes

Laias, Naima Mahhmoud January 1997 (has links)
No description available.
29

The control of Musca domestica (Diptera: Muscidae) with entomopathogenic nematodes (Steinernematidae, Heterorhabditidae)

Renn, Nicholas January 1996 (has links)
No description available.
30

Biological activities of seed of the yam bean, Pachyrrhizue erosus (L.) urban, on the diamondback moth, Plutella xylostella (L.)

Basukriadi, Adi January 1993 (has links)
No description available.

Page generated in 0.0578 seconds