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M Fingerman

Publications and source records attributed to M Fingerman.

69 records · Page 4Linked to original sources
PubMedDate not supplied

Crustacean endocrinology: a retrospective, prospective, and introspective analysis.

From the first discovery of a hormone in a crustacean in the 1920s until the present, the field of crustacean endocrinology has undergone, as do many crustaceans during their development, a marked metamorphosis. The field has moved from the classical era of endocrinological techniques, such as extirpation and additive methods, to the modern era of sophisticated biochemistry and molecular biology. As new investigatory techniques have been devised, crustacean endocrinologists have quickly adopted them and, as a consequence, have made major advances. Nevertheless, there is still much room (and need) for the older techniques, particularly because there is still a vast gap in our knowledge of the endocrine mechanisms of the less highly evolved crustaceans. The bulk of the information we have about crustacean endocrinology has been derived from studies of decapods. Crustacean endocrinology not only provides information about the basic biology of this important group of organisms but also has the potential of greatly enhancing our ability to culture species used as food sources for humans.

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PubMedDate not supplied

Entrainment analysis of the circadian locomotor activity rhythm in specimens of the crayfish, Faxonella clypeata, having activity peaks at different times of the solar day.

Locomotor activity rhythms in the crayfish, Faxonella clypeata, were recorded under conditions of controlled light and temperature. In LD 12:12, dark active rhythms with a major activity onset at lights-off, and bimodally active rhythms with onsets at both lights-on and lights-off were recorded. In DD, most of the LD dark active rhythms retained the lights-off activity onset. However, among the majority of the LD bimodally active crayfish, only the lights-on activity peak persisted in DD. A small number of the LD bimodal rhythms remained bimodal in DD. DD records revealed free-running period lengths both greater and less than 24 hrs. An hypothesis stating that the two recorded LD rhythms represent two basically different rhythmic types is presented. The dark active crayfish appear to entrain to the lights-off position, but the bimodally rhythmic crayfish appear to entrain to the lights-on position.

Animals↗