Results 121 to 130 of about 881 (172)

Poisoning due to Pyrethrins

Toxicological Reviews, 2005
The pyrethrins have a long and fascinating history. They were derived from dried chrysanthemum flower heads that were found to have pesticidal activity centuries ago. They comprise a complex mixture of six main chemicals. Commercial formulations usually contain piperonyl butoxide, which inhibits metabolic degradation of the active ingredients ...
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Pyrethrins and pyrethroids in dermatology.

Archives of dermatology, 1990
In 1987, we reviewed the history and development of natural pyrethrins and man-made synthetic pyrethroids.1The following is a condensation of that report, an update on developments to 1989, and comments on a more recent study of permethrin 5% cream for the treatment of scabies that appears in this issue of theArchives.2 PYRETHRUM AND PYRETHRINS The ...
D, Taplin, T L, Meinking
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An examination of polymerized pyrethrins

Journal of the Science of Food and Agriculture, 1950
AbstractThe resinous material formed by polymerization of a highly purified pyrethrum concentrate has been examined. It was insoluble in cold light petroleum or deodorized kerosene, and gave high values for apparent pyrethrins by the Seil or mercury‐reduction methods, although it was devoid of insecticidal effect on houseflies.
A. Campbell, Wm. Mitchell
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Paper Chromatography of Pyrethrins and their Derivatives

Nature, 1956
VARIOUS methods have been described for the chromatographic separation of pyrethrin-type compounds. Alumina, silica and kieselguhr have been used as adsorbents for separation of ‘pyrethrin I’ from ‘pyrethrin II’1–3. A separation of cinerin I from ‘pyrethrin I’, and ‘cinerin II’ from ‘pyrethrin II’, has almost certainly been achieved by Ward2, using ...
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Pyrethrin and Pyrethroid Insecticides

Veterinary Clinics of North America: Small Animal Practice, 1990
Pyrethroids have a wide spectrum of insecticidal potency, vertebrate toxicity, and environmental stability. The exceptionally high selectivity ratios of pyrethrins and pyrethroids have resulted in their use for insect control in numerous formulations.
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Pyrethrins and Pyrethroid Insecticides

2011
Pyrethrum is one of the oldest and most widely used botanical insecticides and its insecticidal properties have been known for more than 150 years. The commercial limitations of pyrethrum extracts, which are collectively known as pyrethrins, have long been recognized because of their high rate of photodegradation and a short “knockdown” (rapid ...
Jerome J. Schleier III*, Robert K. D. Peterson   +1 more
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Heck Arylation of the Natural Pyrethrins

SSRN Electronic Journal, 2022
Todd E. Markham, Peter J. Duggan, Martin R. Johnston   +2 more
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BIOASSAY SYSTEMS FOR THE PYRETHRINS

Annals of Applied Biology, 1950
The special properties of pyrethrum assays with crawling insects by the film technique lend themselves to the twin cross‐over design, hitherto restricted to assays with graded responses. The conditions under which this design is appropriate, and the treatment of control responses, are discussed.
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Exposure to environmental concentrations of natural pyrethrins induces hepatotoxicity: Assessment in HepG2 cell lines and zebrafish models

Chemosphere, 2022
Jian Lu, Meng Li, Wenping Xu
exaly  

Pyrethrins

1972
GUNTER ZWEIG, JOSEPH SHERMA
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