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The Concentrations Of Some Enzymes Of The Citric Acid Cycle And Electron Transport System In The Large Granule Graction Of Eggs And Trochophores Of The Oyster, Crassostrea Virginica, Robert E. Black Aug 1962

The Concentrations Of Some Enzymes Of The Citric Acid Cycle And Electron Transport System In The Large Granule Graction Of Eggs And Trochophores Of The Oyster, Crassostrea Virginica, Robert E. Black

VIMS Articles

In an accompanying report Black (1962) has shown that considerable changes in the relative activities of several enzymes of the tricarboxylic acid cycle occur during early development of the oyster. Thus, between the blastula and trochophore stages two enzymes, TPN-specific isocitric dehydrogenase and aipha-keto glutaric dehydrogenase, increase 2- to 3-fold, roughly paralleling the increase in respiration during this same period. Five other enzymes were found not to change appreciably during development to the trochophore. These were: aconitase, succinic dehydrogenase, malic dehydrogenase, DPNH oxidase, and cytochrome oxi dase. Following the trochophore stage cytochrome oxidase decreased somewhat in activity, while the other ...


The Blue Crab And Its Fishery In Chesapeake Bay Part 2 - Types Of Gear For Hard Crab Fishing, W. A. Van Engel Aug 1962

The Blue Crab And Its Fishery In Chesapeake Bay Part 2 - Types Of Gear For Hard Crab Fishing, W. A. Van Engel

VIMS Articles

During the 90-year history of the Chesapeake Bay blue crab fishery, many types of fishing devices were tried, but only pots, trotlines, and dredges proved suitable, and they emerged as the primary types of gear for catchfng hard crabs. In the early years of the fishery, trotlines with their various modifications were used princip~lly for catching hard crabs in the summer. The Chesapeake Bay crab pot, patented in 1938 and modified only slightly since, gradually replaced the trotline. Pots now account for two-thirds of the Virginia hard crab catch and more than half of the Maryland catch, The dredge ...


Respiration, Electron-Transport Enzymes, And Krebs-Cycle Enzymes In Early Developmental Stages Of The Oyster Crassostrea Virginica, Robert E. Black Aug 1962

Respiration, Electron-Transport Enzymes, And Krebs-Cycle Enzymes In Early Developmental Stages Of The Oyster Crassostrea Virginica, Robert E. Black

VIMS Articles

A marked increase in the rate of respiration during early development has been noted in many different organisms (see Brachet, 1950 ; Boell, 1955). In most cases the changes in respiratory enzymes which might contribute to the respiratory increases have not been fully studied. Of particular interest in this connection are studies which have dealt with enzymes of the tricarboxylic acid (citric acid) cycle, as well as those investigations of the enzymes involved in the transfer of electrons between substrates and oxygen, via the systems which oxidize reduced pyridine nucleotides and succinic acid.


Oyster Mortality Studies In Virginia: Ill. Epizootiology Of A Disease Caused By Haplosporidium Costale Wood And Andrews, Jay D. Andrews, Johon L. Wood, H. Dickson Hoese Jan 1962

Oyster Mortality Studies In Virginia: Ill. Epizootiology Of A Disease Caused By Haplosporidium Costale Wood And Andrews, Jay D. Andrews, Johon L. Wood, H. Dickson Hoese

VIMS Articles

A short, sharp eplzootic disease of oysters on Seaside of Eastern Shore, Virginia, has been associated with a new pathogen, Haplosporidium costale Wood and Andrews. Native oysters in trays have shown closely timed May-June losses for three consecutive years. Losses at other seasons were small. May-June losses ranged from 12 to 14 percent in 1959 to 36 to 44 percent in 1960. James River oysters moved to Seaside showed higher losses than natives after a year of acclimation. Oysters in Bayside creeks revealed late summer losses caused by Dermocystidimn marinmn Mackin, Owens, and Collier rather than May-June deaths.

The new ...