Now showing items 1-10 of 490
The effects of solvents and nucleophiles on heteroaromatic SRN1 reactions.
(Virginia Polytechnic Institute and State University, 1978)
The Southern pine beetle, Dendroctonus frontalis Zimm., and associated Coleoptera attracted to dead loblolly pine, Pinus taeda L.
(Virginia Tech, 1978-06-05)
<p>This study tests the hypothesis: Bark beetles initially locate their host trees in a non-random manner. The association of the southern pine beetle (<u>Dendroctonus frontalis</u> Zimm.) and associated Coleoptera with ...
Stress detection in loblolly pine using relative apparent temperatures
(Virginia Tech, 1979-05-05)
<p>The hypothesis that stressed loblolly pine (Pinus taeda L.) could be distinguished from non-stressed loblolly pine by increased foliage temperatures was tested. The foliage temperatures of seedlings and trees were ...
A morphological and systematic study of the first and second instars of the Kermesidae in the Nearctic region (Homoptera: Coccoidea)
(Virginia Tech, 1978-08-01)
The Cocco idea or scale insects are among the most important pests of sylvicultural, ornamental, agricultural and greenhouse plantings throughout the world. There are 21 families comprising 6,000 species. Direct injury ...
The armored scale insects of Venezuela (Homoptera: Coccoidea: Diaspididae)
(Virginia Tech, 1971-04-05)
ESR investigation of some free-radical adducts.
(Virginia Tech, 1977-01-15)
<p>The effect of steric strain on the esr hyperfine coupling constants of several free-radical adducts of perfluoropropene and perfluoro-2-butene were investigated. Silyl, hydroxyalkyl, thiyl and alkoxy free radicals, which ...
Morphology and taxonomy of the first instars of the genus Cerococcus Comstock (Homoptera:Coccoidea:Cerococcidae).
(Virginia Tech, 1976-09-15)
The taxonomy of species in the genus <i>Cerococcus</i> has been unstable and adequate keys and descriptions have not been available for identification. This detailed study of the first instars is one step in the revision ...
The nature of serum agglutination of bovine spermatozoa: a proposed mode of action and its metabolic effects.
(Virginia Tech, 1976-11-01)
INTRODUCTION<p> Numerous past reports have mentioned or have been totally concerned with the significance of spermatozoan agglutination following treatment with blood sera, female genital fluids and other biological and ...
A photoelastic technique for the determination of stress intensity factors.
(Virginia Tech, 1976-07-05)
A technique for obtaining values of the stress intensity factor from photoelastic data for three dimensional cracked body problems is described. The stress intensity determination is accomplished without resorting to stress ...
An investigation of assignment rules for fitting new subjects into clusters established by hierarchical pattern analysis.
(Virginia Tech, 1977-08-05)
<p>Cluster analysis has been used fairly extensively as a means of grouping objects or subjects on the basis of their similarity over a number of variables. Almost all of the work to this point has been for the purpose of ...