Biomedical subjects
W J Bell
Publications and source records attributed to W J Bell.
History of anatomical instruction in New England in a letter of Benjamin Waterhouse, 1808.
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Martha Brand (1755?--1814): and early American physician.
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Informational analysis of agonistic behaviour and dominance hierarchy formation in a cockroach, Nauphoeta cinerea.
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Synthesis and activity of 29-hydroxy-3,11-dimethyl-2-nonacosanone, component B of the German cockroach sex pheromone.
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Ontogenetic and temporal aspects of agonistic behavior in a cockroach, Periplaneta americana.
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Chemo-anemotaxis: a behavioral response to sex pheromone in nonflying insects.
The cockroach, Periplaneta americana, running on a Y-ring globe, moves downwind if an air current is directed toward the head. However, if the air current carries sex pheromone, then upwind movement is elicited. This orientation behavior is apparently a mechanism to facilitate the orientation of males searching for pheromone-secreting females.
Oliver Wendell Holmes declines an invitation.
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Practitioners of history: Philadelphia medical historians before 1925.
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Benjamin Spector, 8 July 1893-17 February 1976.
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Betsy Copping Corner, 1888-1976.
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Synthesis of 3,11-dimethyl-2-nonacosanone, a contact courting pheromone of the German cockroach.
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Factors promoting vitellogenic competence and yolk deposition in the cockroach ovary: larval-adult transition.
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Individual odor differences and their social functions in insects.
The evolution of individual or subgroup differences in odors of halictine bees is suggested from possible widespread intraspecific variation in pheromones. An important result of such variation may be maintenance of genetic polymorphisms; in nesting Hymenoptera odor differences may also facilitate individual nest recognition. In Lasioglosum zephyrum males habituate to odors of different females and perhaps thus save time by not trying to copulate with nonreceptive individuals. Guards (females) at nest entrances distinguish their few nestmates (other females) from other conspecific individuals by odors, seemingly pheromones. Duration of the habituation in L. zephyrum is at least an hour (perhaps much more) for males in relation to females and 6 or 7 days for guards in relation to nestmates. Studies of pheromones should take into consideration the possibility of pheromonal polymorphism in any species and the likelihood that it may be significant from biological and practical viewpoints.
Agonistic behavior in the German cockroach, Blattella germanica.
Agonistic behavior in Blattella germanica is delineated with an emphasis on fighting techniques and population factors affecting aggressiveness. Male-male, male-female, and male-male encounters are not significantly different in either level of aggressiveness or frequency. Female-female carrying oothecae are, however, more aggressive than other female-female. The mean intensity of aggression increases as population density is increased, but number of contacts per individual per unit time remains constant. Defense of specific, territories does not occur and aggressive interactions are most common during the dark portion of the photocycle, when many of the cockroaches are observed to be foraging.