William R. Eckberg
Howard University
22 Papers
306 Citations
William R. Eckberg is an academic researcher from Howard University. The author has contributed to research in topics: Chaetopterus & Germinal vesicle. The author has an hindex of 12, co-authored 22 publications. Previous affiliations of William R. Eckberg include Marine Biological Laboratory & Université de Montréal.
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Papers
Propagated and nonpropagated calcium transients during egg activation in the annelid, Chaetopterus.
TL;DR: New data are consistent with the hypothesis that the activation of protostome eggs is initiated by Ca2+ waves, but the fact that these waves propagated from pole to pole like those in deuterostome egg refutes the notion that Ca2+, waves in activating protstome eggs move inward from the whole surface.
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MAP and cdc2 Kinase Activities at Germinal Vesicle Breakdown inChaetopterus
TL;DR: It is suggested that MAPK activation is neither obligatory nor sufficient for either GVBD or meiotic metaphase arrest in Chaetopterus and that activation of MAPK and cdc2 occur on independent, parallel pathways.
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A cytological analysis of fertilization in chaetopterus pergamentaceus 3
TL;DR: Sperm did not produce acrosomal processes like those of many other invertebrates, and no part of the sperm penetrated the vitelline layer until the sperm was incorporated into the fertilization cone.
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Sequestered calcium triggers oocyte maturation in Chaetopterus
TL;DR: The results of these experiments indicate 1) that Ca2+ fluxes regulate GVBD and activation in Chaetopterus, 2) that these fluxes can be internally generated, and 3) thatCa2+ sequestration by Ca2-dependent ATPase may have a role in maintaining the intact germinal vesicle.
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Intracellular pH increase driven by an Na+/H+ exchanger upon activation of surf clam oocytes.
TL;DR: Results show that a pHi increase, driven by a typical Na+/H+ exchanger, follows activation of surf clam oocytes but that this p Hi increase is neither sufficient nor required for GVBD, though it does allow its progression at an optimal rate.
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