Download or read book Effects of Ionizing Radiation and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by Victor Avery Nelson and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ionizing Radiation and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by and published by . This book was released on 1971 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ionizing Radition and Temperature on the Larvae of the Pacific Oyster Crassostrea Gigas written by Victor Avery Nelson and published by . This book was released on 1972 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Temperature Salinity Feeding Substrate and Storage on the Setting and Survival of Commercially reared Eyed Larvae of the Pacific Oyster Crassostrea Gigas written by Barbara Louise Kern Carlson and published by . This book was released on 1981 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Ionizing Radiation on Aquatic Organisms written by National Council on Radiation Protection and Measurements. Scientific Committee 64-9 on Effects of Radiation on Aquatic Organisms and published by Ncrp. This book was released on 1991 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Bibliography of Marine Radiation Ecology Prepared for the Seabed Program written by Vincent Schultz and published by . This book was released on 1980 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Histopathological Effects of Ionizing Radiation on the Pacific Oyster Crassostrea Gigas written by Michael Cary Mix and published by . This book was released on 1970 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reproduction and Development of Marine Invertebrates of the Northern Pacific Coast written by Megumi F. Strathmann and published by University of Washington Press. This book was released on 2017-10-01 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference work is designed to provide background information on an array of northeastern Pacific marine invertebrate species so that they can be more easily included in comparative studies of morphology, cell biology, reproduction, embryology, larval biology, and ecology. It is meant to serve biologists who are new to the field as well as experienced investigators who may not be familiar with the invertebrate fauna of the northern Pacific Coast. The species discussed in this volume are mostly from the cold temperate waters of the San Juan Archipelago, near Puget SOund and the Strait of Georgia, but the information and methods given will be useful in laboratories from Alaska to central California and applicable to some extend in other coastal or inland facilities. An introductory chapter discusses basic prodcedures for collecting and maintaining mature specimens, for initiating spawning, and for culturing embryos and larvae in the laboratory. Subsequent chapters summarize reproduction and development in thirty different invertebrate groups and provided ercent references through which additional information can be traced, cite monographs or keys needed to identify species, and give methods useful for studying an array of selected species. Available information on habitat, diet, reproductive mode, egg size, developmental pattern, developmental times, larval type, and conditions for settlement and metamorphosis is reported for over 450 species.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1972 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radionuclides in Ecosystems written by Daniel J. Nelson and published by . This book was released on 1971 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Temperature on Metamorphosis of the Pacific Oyster Crassostrea Gigas written by Kevin J. Bright and published by . This book was released on 1986 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of X and Gamma Irradiation on the Juvenile Pacific Oyster Crassostrea Gigas written by Steve Ray Trenholm and published by . This book was released on 1977 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two separate studies were conducted during this research project. Oysters were irradiated with 500 and 1000 rads and 5, 10, 20, 50, 75, 100, 150, and 200 krads in the first study in order to determine the effects of ionizing radiation on survival and growth rates. Two periods of high mortality were noted; the first occurred from 2 to 7 days postirradiation in oysters receiving 75 to 200 krads and was associated with an "acute lethal tissue degenerative syndrome." The second mortality period occurred from 40 to 60 days postirradiation in oysters exposed to 10 krads or more and was caused by a "lethal tissue degenerative syndrome." The LD-50 dose was found to be a complex function of time from the moment of irradiation until approximately 80 days postirradiation. The 238-day LD-50 value was 16.5 krads. The mean wet weight of oysters exposed to 20 krads was significantly less than that of the controls from 167 to 238 days postirradiation. Analysis of the results suggest a dose dependent wet-weight relationship in the 5 and 10-krad oysters; they did not weigh significantly less than the controls. Although not statistically significant, the mean wet weights of oysters exposed to 500 and 1000 rads exceeded that of the controls from 43 to 238 days postirradiation. In the second study, oysters were irradiated with 200 R, 600 R, 1000 R, 5 kR (X irradiation), and 8, 16, and 40 krads (gamma irradiation). The purposes of the second study were to analyze histopathologically, the degenerative syndromes and subsequent tissue repair processes in the stomach, gut, collecting ducts, and digestive tubules. Degenerative changes were seen only in the digestive tubules of 5- and 8-kR oysters while in oysters exposed to 16 and 40 krads, degenerative changes coincided with the lethal tissue degenerative syndrome noted in the survival-wet weight study. A tissue regeneration sequence was observed in the stomach, gut, collecting ducts, and digestive tubules of most oysters exposed to 16 krads and in a smaller number of oysters exposed to 40 krads. Tissue regeneration was first observed in the digestive tubules and subsequently in the stomach, gut, and collecting ducts. Repopulation of the digestive tubules involved reepithelialization of the tubule with large, undifferentiated crypt cells followed by their differentiation into secretory and absorptive cells. Tissue recovery in the stomach, gut, and collecting ducts was initiated by islands of small basophilic cells not previously described in these tissues. Rapid mitotic proliferation of these cells and their subsequent differentiation into basal epithelial cells, resulted in the reepithelialization and eventual recovery of these tissues.

Download or read book Technical Report written by and published by . This book was released on 1972 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of some reports

Download or read book The Effects of Temperature and Food Availability on Energy Partitioning and Growth in the Pacific Oyster Crassostrea Gigas Thunberg written by Robert E. Malouf and published by . This book was released on 1977 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Ocean Acidification on Multiple Life History Stages of the Pacific Oyster Crassostrea Gigas written by Emma B. Timmins-Schiffman and published by . This book was released on 2014 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: As global climate change accelerates, due in large part to increasing emissions of carbon dioxide and other greenhouse gases from fossil fuel use, agriculture, and large-scale changes in land use, natural ecosystems bear the consequences. For marine systems these include increased mean seawater temperature, changes in carbonate chemistry equilibria, and increased pollutant loading due to non-point run-off, among other effects. Human-induced environmental changes will not have the same magnitude of effect in all regions, but on average the changes occurring are rapid and significant. Natural populations will either need to acclimatize and/or adapt, or shift their ranges to enable continued existence. This dissertation explores the effects of ocean acidification on the Pacific oyster, Crassostrea gigas. Oysters are sedentary and inhabit a naturally variable environment (the intertidal zone) and thus may be pre-adapted to withstand rapid environmental change. Oysters and similarly sedentary organisms are ideal for investigating the effects of environmental change on biology because they are not able to escape these changes, but must respond physiologically (acclimatize) if they are to survive. Due to this ecological history, oysters provide a model that allows us to explore potential physiological mechanisms that are needed in a response to specific environmental changes as well as the limits of these mechanisms. In the first chapter, the effects of elevated partial pressure of CO2 (pCO2, a major driver of ocean acidification) on oyster larvae are explored. Larvae were exposed to low pH during early development, a period that included the transition from energetic dependence on maternally derived lipids to dependence on exogenous resources. Larvae were found to experience a developmental delay at elevated pCO2, manifested as smaller size and slower rate of shell deposition. These significant effects of ocean acidification on early larval development may indicate a bottleneck in the oyster life cycle as the pH of marine waters decreases. Subsequent research has shown that these effects at early larval stages can carry over into later stages after settlement in another oyster species (Hettinger et al. 2012). In order to better understand the effects of environmental change on oyster physiology, we developed proteomic tools to explore changes in protein pathways in oyster gill (ctenidia) tissue. The second chapter explores the gill proteome (suite of expressed proteins) of adult oysters. Characterization of the proteome provides insight into the physiological mechanisms that may be available to the oyster during response to an environmental stress. The results revealed that the ctenidia proteome includes a diverse array of proteins that accomplish many functions and that it is a metabolically active tissue. The proteome sequencing lays the groundwork for exploring how ocean acidification affects various proteomic pathways in the tissue that acts as the interface between the oyster and its environment. Lastly, the adult oyster response to ocean acidification and a second stress are explored via proteomics, fatty acid profiles, glycogen content, shell microstructure, and mortality in response to heat shock. There was a significant impact of ocean acidification on oyster shell integrity, but no effects after one month of exposure on relative amounts of fatty acid, glycogen or response to acute heat shock. Through the proteomic analysis, we revealed an active and significant proteomic response to ocean acidification exposure, uncovering some of the mechanisms behind the observed macro-phenotypic changes. Additionally, the proteomic response to mechanical stimulation was largely altered between low and high pCO2, suggesting that ocean acidification can fundamentally change how oysters respond to a second stress.

Download or read book Beneficial Effects of Bacteria on the Culture of Larvae of the Pacific Oyster Crassostrea Gigas Thunberg written by Philippe A. Douillet and published by . This book was released on 1991 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: