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Waldemar Klassen

United States Department of Agriculture

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Chromosoma | 1968

Comparative effects of tretamine, tepa, apholate and their structural analogs on human chromosomes in vitro

Tsueng-Hsing Chang; Waldemar Klassen

Breakage of human chromosomes was studied in vitro by treating leukocyte cultures for 8 hours with tretamine, tepa, hempa, hemel, and apholate. The aziridines tretamine, tepa, and apholate effectively induced aberrations; the dimethylamino compounds, hemel and hempa, induced few. Tretamine, the most effective compound, induced aberrations in 78% of the cells; hempa, the least effective, induced aberrations in 14%, even at a 1000-fold greater molar concentration. Abberations occurred in 6% of control cells. The gaps and breaks were induced randomly among cells.

Annals of The Entomological Society of America | 1970

The Potential for Insect-Population Suppression by Dominant Conditional Lethal Traits

Waldemar Klassen; E. F. Knipling; J. U. Mcguire

Journal of Economic Entomology | 1970

Permanent Sterility Induced in Boll Weevils with Busulfan without Reducing Production of Pheromone

Waldemar Klassen; N. W. Earle

Annals of The Entomological Society of America | 1972

The Use of Fumidil-B to Reduce Microsporidian Disease in Colonies of the Boll Weevil

H. M. Flint; Judy Eaton; Waldemar Klassen

Journal of Economic Entomology | 1968

Potential Chemosterilants for Boll Weevils

Waldemar Klassen; J. F. Norland; Alexej B. Bořkovec

Journal of Economic Entomology | 1973

Chemosterilization of the Female Boll Weevil

H. M. Flint; N. W. Earle; Judy Eaton; Waldemar Klassen

Journal of Economic Entomology | 1968

Chemosterilization of the Tobacco Budworm: A Survey of 21 Compounds Applied Topically

H. M. Flint; Waldemar Klassen; Elaine L. Kressin; Jerome Norland

Canadian journal of genetics and cytology | 1969

Effects of apholate on chromosomes of germ cells in the grasshopper testes.

Waldemar Klassen; Tsueng Hsing Chang; Paul E. Eide

Journal of Economic Entomology | 1968

Chemosterilization of the Tobacco Budworm: A Survey of 16 Compounds Fed to Adult Moths

H. M. Flint; Waldemar Klassen; J. F. Norland; Elaine L. Kressin

Bulletin of the Entomological Society of America | 1978

Interdisciplinary Programs in Insect Mass Rearing and in Insect Population Management

Waldemar Klassen

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H. M. Flint

United States Department of Agriculture

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Elaine L. Kressin

United States Department of Agriculture

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J. F. Norland

United States Department of Agriculture

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Judy Eaton

United States Department of Agriculture

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N. W. Earle

United States Department of Agriculture

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Richard J. Sauer

University of Minnesota

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Alexej B. Bořkovec

United States Department of Agriculture

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E. F. Knipling

United States Department of Agriculture

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Edward H. Glass

Cornell University

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Gary R. Anderson

United States Department of Agriculture

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