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  • 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.
1

Melon Insect Pest Management in Arizona

Palumbo, John C., Kerns, David 06 1900 (has links)
7 pp. / Melon production in the Southwestern United States occurs primarily in the desert growing areas of Arizona, and Southern California. Melons in Arizona are grown in very diverse cropping systems, where a variety of vegetable, agronomic and seed crops are cultivated concurrently throughout the year. Numerous insect species can be found on melon plants, but only a few have been determined to be economically important. This publication discusses several key insects that cause economic damage to melons, and the tactics commonly used to manage infesting populations.
2

The persistance and biological effects of cypermethrin on different surfaces

Hajjar, Mohammad Jamal January 1990 (has links)
No description available.
3

Pesticide residues in cucumbers cultivated in Bangladesh

Haag, Jennie, Landahl, Anna January 2014 (has links)
Pesticides are widely used for preventing crop losses due to pest attack. In Bangladesh, the food safety and health of farmers are being compromised as a result of poor regulation concerning usage of pesticides in food production. The aim of this study was to identify and quantify pesticides applied on cucumber crops in Bangladesh. A method for extraction and clean-up was developed to allow the quantification of four pesticides by GC-ECD in vegetable samples, specifically cucumber. The accuracy of the method was validated using recovery and its precision by studying the standard deviation and relative standard deviation. Analysis of cucumber samples obtained in the field showed no traces of the target pesticides. The results indicate that different types of chemicals are used on the examined crops. It is also believed that the growth habit of cucumber may affect the exposure to pesticides. To overcome the health hazards, restrictions regarding the types and quantities of chemicals used on the fields need to be implemented. Further studies would benefit from being executed in a controlled environment, and monitoring of which substances that are applied at which amounts.
4

Esterases as indicators of exposure of birds to pesticides

Thompson, H. M. January 1988 (has links)
No description available.
5

Laboratory studies on the effect of 'stress' on the susceptibility of the diamond moth (Plutella xylostella) and the rose-grain aphid (Metapolophium dirhodum) to insect pathogens

Schuler, Tanja H. January 1995 (has links)
No description available.
6

Selection for asulam resistance in barley

Giffard, S. C. January 1985 (has links)
No description available.
7

Cloning and expression of herbicide-specific single chain antibody fragments in Escherichia coli and Nicotiana tabacum

Learmonth, Dianne January 1997 (has links)
An anti-diuron scAb fragment was produced and expressed in <I>E. coli.</I> Characterization by ELISA demonstrated that the scAb displayed a similar binding profile to the parent monoclonal antibody, although its binding sensitivity appeared to be 10-50 times lower. Analysis of purified samples by HPLC showed the presence of scAb in both monomeric and dimeric forms. Expression yield of the anti-diuron scAb was low (0.05 mg/l culture volume), and attempts to reduce the toxicity of production in <I>E. coli</I>, using alternative expression vectors, were not successful. Production in an <I>E. coli</I> strain which allowed cytoplasmic folding resulted in an increase in yield of soluble scAb, but this antibody material showed reduced stability. The anti-atrazine scAb was expressed in tobacco. Although the levels of scAb produced were lower than might have been expected (0.014% total soluble protein), the scAb was fully functional and exhibited a binding affinity similar to that of bacterially-produced scAb. BIAcore analysis of affinity purified samples indicated a binding affinity comparable to that of the parental Mab. In competition ELISA, the scAb showed a concentration-dependent reduction in antigen binding in the presence of free atrazine. Binding sensitivity of the scAb for atrazine, and for the closely related triazine propazine, were very similar, while binding sensitivity for simazine was 10 times lower. Bacterially-produced anti-atrazine scAb demonstrated similar binding sensitivities for the atrazine analogues.
8

The action of formamidines at octopamine-sensitive receptors in Antheraea larvae

Cox, S. C. January 1987 (has links)
No description available.
9

Air jet behaviour in porous structures with application to orchard spraying

Cant, Ross James January 1999 (has links)
No description available.
10

The metabolism of carbofuran in active soils and its responses to enzyme inhibitors

Talebi, Khalil January 1989 (has links)
No description available.

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