| Biological Controls on the Precipitation of Chromium in Harbor Sediments |
02 DEC 2003 |
7 pages |
| Authors:
Bradley M. Tebo; Anna Y. Obraztsova; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
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 | The overall goal of this project was to evaluate the processes involved in the attenuation of hexavalen chromium (Cr(VI)) contamination in harbor sediments. Specifically our objectives were to 1) evaluate the mechanisms of Cr(VI) reduction in harbor sediments; 2) evaluate whether bacteria can couple their growth on organic matter to Cr(VI) reduction and if so, whether there is a hierarchy in the use of electron acceptors by these bacteria; and ... |
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| Correlations between Halobates Distributions and Physical Processes at the Sea Surface |
NOV 97 |
7 pages |
| Authors:
Lanna Cheng; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
|
| Five sea-skater species, each with a well-defined geographical range, are specifically adapted to live on the surface film. (1) Analyses of an 18- month time series showed that the range of Halobates micans and H. sericeus in the Pacific Ocean are generally separate. H. micans is restricted to a zone between 11 deg. N and 10 deg S., with amphitropical populations of H. sericeus north and south of this region. ... |
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| Bioluminescence Source Emission Characterization |
30 SEP 95 |
6 pages |
| Authors:
Michael I. Latz; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
|
| A study of the hydrodynamics characterization of the excitation of bioluminescence was performed in collaboration with NRaD scientist Dr. James Rohr. Present research using fully developed pipe flow confirmed previous work using Couette flow that the excitation threshold for dinoflagellate bioluminescence occurred in laminar flow at a shear stress level greater than typical levels in the mixed layer. Maximum response was achieved at high laminar flow values, with no further ... |
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| Biology of Symbioses between Marine Invertebrates and Intracellular Bacteria |
30 JAN 90 |
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| Authors:
Horst Felbeck; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
|
 | The gene for ribulose-bisphosphate carboxylase was characterized for several chemoautotropic bacterial symbionts. The gene of the symbiont of the deep-sea snail Alvinochonca hessleri has been largely sequenced and compared to the sequences of other photo- and chemoautotrophic bacteria and a preliminary phylogenetic tree has been constructed. Oligonucleotide probes against the symbionts in Lyrodus pedicellatus have been used to verify the identity of this bacterium. Method development to obtain sequences from ... |
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| Biogeochemical Cycling of Manganese at Hydrothermal Vents |
90 |
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| Authors:
Bradley M. Tebo; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
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| The interactions between bacteria and metals in the ocean are profoundly important both in environments with high levels of metals, such as hydrothermal vents, as well as in metal-poor oligotrophic environments. These represent the environmental extremes for metal concentrations. Metals affect primary productivity by both metal limitation of phytoplankton growth and by serving as a potential energy source for bacterial (autotrophic) growth. In addition, the highly charged surfaces of metal ... |
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| Biology of Symbioses between Marine Invertebrates and Intracellular Bacteria |
05 JAN 89 |
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| Authors:
Horst Felbeck; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
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| The object of this research is to characterize symbiotic chemoautotrophic bacteria using molecular techniques. We are concentrating on the sequencing of their 16s rRNA to establish phylogenetic relationships between symbionts from different invertebrate hosts. We have also tested the use of oligonucleotide probes to identify putative symbionts in culture and are working to use this technique to detect 'free living' symbionts. In addition, we compare genes for ribulose-1,5-bisphosphate-carboxylase and nitrogenase ... |
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| Behavior of the White Shark, Carcharodon carcharias, and Scalloped Hammerhead, Sphyrna lewini |
05 DEC 84 |
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| Authors:
A. P. Klimley; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE BIOLOGY RESEARCH DIV
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| Capture records of 109 white sharks caught along the western coast of North America indicate the following life history pattern. Adult females give birth to pups during the late summer and early fall south of the Point Conception to live both inshore or offshore at islands. As females continue to grow, they move back south of Point Conception yet remain offshore probably to give birth to young. It is believed ... |
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