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  • zooplankton  (3)
  • *Cell Cycle Proteins  (2)
  • *Tumor Suppressor Proteins  (1)
  • AIRCRAFT STABILITY AND CONTROL  (1)
  • Acartia clausi  (1)
  • 1995-1999  (2)
  • 1990-1994  (5)
  • 1955-1959
Collection
Keywords
Publisher
Years
  • 1995-1999  (2)
  • 1990-1994  (5)
  • 1955-1959
  • 1985-1989  (1)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Role of bacteria as food for zooplankton in a eutrophic tropical pond (Ivory Coast) (1994)
    Springer
    Aquatic ecology 28 (1994), S. 167-174 
    Details
    ISSN: 1573-5125
    Keywords: bacteria ; zooplankton ; grazing ; tropical pond ; eutrophic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of the study was to determine whether bacteria could be a substantial source of carbon for zooplankton and whether the grazing pressure of these metazoan filter-feeders could influence the fate of bacterial production. Eight grazing experiments using natural bacteria labelled with3H thymidine were conducted in a tropical pond (Ivory Coast) during various phases of biological colonization (rotifer-dominated and copepod-dominated phases of the colonization). Higher grazing and clearance rates were observed with rotifers (Brachionus plicatilis andHexarthra intermedia), while very low values were obtained when the cyclopoid copepodApocyclops panamensis was dominant. Less than 1% of the bacterial production was harvested when copepods were dominant, whileB. plicatilis consumed up to 36% of this production. However, this consumption of bacteria appeared to contribute only to an insignificant proportion of the daily carbon intake (e.g. 0.9 to 7.1% of body carbon for rotifers). The low contribution of bacteria in the nutrition of zooplankton is discussed in terms of their cell size and their relative abundance in the total amount of seston available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02333987
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cross frontal variability in hydrological and biological structures observed in a river plume area (Rhône mouth, NW Mediterranean Sea) (1996)
    Springer
    Hydrobiologia 324 (1996), S. 131-140 
    Details
    ISSN: 1573-5117
    Keywords: plume ; variability ; dissolved matter ; particles ; bacteria ; flagellates ; zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Rhône River plume area, NH inf4 + , DFAA, seston particles, bacteria, flagellates and mesozooplankton were studied over 24 hours at a fixed station. Variations of both abiotic and biotic variables demonstrated rapid changes in vertical structure, from stratified towards mixed. This evolution was related to hydrodynamical changes caused by wind. Strong variability resulting from hydrological changes was apparent in surface water where the plume edge crossed the station as evident by sharp increase in particle volume (20–25 µm ESD range), NH inf4 + (from 9 to 12 µM) and DFAA (from 1 to 3 µM) concentrations. This frontal ecosystem favored fast growing organisms such as bacteria of which densities reached 19 and production 0.22–0.26 µg C l−1 h−1, and flagellates which showed densities of 1.5 to 2 µg C l−1. Among DFAA, the relative concentration (mole %) of serine increased from 13.3% in the plume water to 44–45% in the front system. The biomass and feeding activity of zooplankton also increased at the plume boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018174
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zooplankton feeding on seston in the Rhone River plume area (NW Mediterranean Sea) in May 1988 (1990)
    Springer
    Hydrobiologia 207 (1990), S. 241-249 
    Details
    ISSN: 1573-5117
    Keywords: River plume ; zooplankton ; particle spectrum ; grazing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Rhone delta area the seston concentration was maximum in the plume waters where small-sized particles dominated, while marine waters were characterized by large particles. The food conditions were optimal for grazers in the interface layer, where the high chlorophyll concentration contrasted with the low values found under the plume. The mesozooplankton specific composition did not show marked difference in and outside the plume. No special pattern for particle size selection by grazers appeared in the plume, contrary to marine waters, where largest particles were the most intensively grazed. The calculations of specific ingestion and filtration rates show that the plume waters (particularly at the salinity interface) were more favourable to zooplankton feeding than the marine ones (outside and under the plume). Nevertheless, taking into account the high level of seston biomass in the whole area studied, the daily grazing pressure of mesozooplankton was very low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041462
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  • 4
    Electronic Resource
    Electronic Resource
    In situ metabolic budget for the calanoid copepod Acartia clausi in a tropical brackish water lagoon (Ebrié Lagoon, Ivory Coast) (1994)
    Springer
    Hydrobiologia 272 (1994), S. 147-161 
    Details
    ISSN: 1573-5117
    Keywords: Acartia clausi ; copepod ; tropical lagoon ; metabolic budgets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Simultaneous measurements of respiration, excretion and production rates were carried out several times over a year period at five representative stations of the Ebrié Lagoon. Assuming a constant assimilation efficiency rate of 69.4%, we derived metabolic budgets for carbon, nitrogen and phosphorus. Daily specific ingestion rates calculated were rather generally high, and ranged between 54 and 159% of body carbon, between 26 and 102% of body nitrogen and between 108 and 307% of body phosphorus. Regional and seasonal variations depended mainly upon variations in trophic conditions. Curvilinear relationships between ingestion production, or net production efficiency K2, and food concentration (as chlorophyll-a + phaeopigments) showed that food could have been a limiting factor. Furthermore, K2 were low when compared with data from the literature (mean of 21% in carbon, 39% in nitrogen and 11% in phosphorus). Complementary laboratory experiments carried out on adults fed with enriched natural particles or algal cultures (Tetraselmis sp. or Dunaliella sp.) showed similar production (egg-production) vs food concentration curvilinear relationships as in the field. However, considerably higher maximal ingestion and production rates were obtained for animals fed algal cultures suggesting that optima for food acquisition and transformation were not reached in field conditions. Consequently, A. clausi, which represents more than 50% of the zooplankton biomass, appears to be rather inefficient in transforming the abundant particulate organic matter produced in the lagoon. This results from its high level of metabolic expenditure through respiration or excretion (about 50% of ingestion in terms of carbon) and from the small size and poor trophic value of food particles (high percentage of detritus).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006518
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    Paper (German National Licenses)
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  • 5
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    Association of cdk2 kinase with the transcription factor E2F during S phase (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-02-28
    Description: The transcription factor E2F controls the expression of several proliferation-related genes and is a target of the adenovirus E1A oncogene. In human cells, both cyclin A and the cdk2 protein kinase were found in complexes with E2F. Although the total amounts of cdk2 were constant in the cell cycle, binding to E2F was detected only when cells entered S phase, a time when the cdk2 kinase is activated. These data suggest that the interaction between cdk2 and E2F requires an active kinase that has cyclin A as a targeting component.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pagano, M -- Draetta, G -- Jansen-Durr, P -- New York, N.Y. -- Science. 1992 Feb 28;255(5048):1144-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉European Molecular Biology Laboratory, Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1312258" target="_blank"〉PubMed〈/a〉
    Keywords: Adenovirus Early Proteins ; Base Sequence ; *CDC2-CDC28 Kinases ; *Carrier Proteins ; Cell Cycle ; *Cell Cycle Proteins ; Cyclin-Dependent Kinase 2 ; *Cyclin-Dependent Kinases ; Cyclins/*metabolism ; *DNA-Binding Proteins ; E2F Transcription Factors ; HeLa Cells ; Humans ; Macromolecular Substances ; Molecular Sequence Data ; Oligodeoxyribonucleotides/chemistry ; Oncogene Proteins, Viral/genetics ; Protamine Kinase/metabolism ; Protein Kinases/*metabolism ; *Protein-Serine-Threonine Kinases ; Retinoblastoma-Binding Protein 1 ; *S Phase ; Transcription Factor DP1 ; Transcription Factors/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 6
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    Role of the ubiquitin-proteasome pathway in regulating abundance of the cyclin-dependent kinase inhibitor p27 (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-08-04
    Description: The p27 mammalian cell cycle protein is an inhibitor of cyclin-dependent kinases. Both in vivo and in vitro, p27 was found to be degraded by the ubiquitin-proteasome pathway. The human ubiquitin-conjugating enzymes Ubc2 and Ubc3 were specifically involved in the ubiquitination of p27. Compared with proliferating cells, quiescent cells exhibited a smaller amount of p27 ubiquitinating activity, which accounted for the marked increase of p27 half-life measured in these cells. Thus, the abundance of p27 in cells is regulated by degradation. The specific proteolysis of p27 may represent a mechanism for regulating the activity of cyclin-dependent kinases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pagano, M -- Tam, S W -- Theodoras, A M -- Beer-Romero, P -- Del Sal, G -- Chau, V -- Yew, P R -- Draetta, G F -- Rolfe, M -- New York, N.Y. -- Science. 1995 Aug 4;269(5224):682-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Mitotix Inc., Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7624798" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Anaphase-Promoting Complex-Cyclosome ; Animals ; *Cell Cycle Proteins ; Cell Line ; Cyclin-Dependent Kinase Inhibitor p27 ; Cyclin-Dependent Kinases/*antagonists & inhibitors ; Cysteine Endopeptidases/*metabolism ; Electroporation ; Enzyme Inhibitors/metabolism ; Humans ; Kinetics ; Leupeptins/pharmacology ; Ligases/metabolism ; Mice ; Microtubule-Associated Proteins/*metabolism ; Multienzyme Complexes/*metabolism ; Proteasome Endopeptidase Complex ; Rabbits ; Recombinant Proteins/metabolism ; Succinates/pharmacology ; Tumor Cells, Cultured ; *Tumor Suppressor Proteins ; Ubiquitin-Conjugating Enzymes ; *Ubiquitin-Protein Ligase Complexes ; Ubiquitin-Protein Ligases ; Ubiquitins/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Prediction of forces and moments for hypersonic flight vehicle control effectors (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This research project includes three distinct phases. For completeness, all three phases of the work are briefly described in this report. The goal was to develop methods of predicting flight control forces and moments for hypersonic vehicles which could be used in a preliminary design environment. The first phase included a preliminary assessment of subsonic/supersonic panel methods and hypersonic local flow inclination methods for such predictions. While these findings clearly indicated the usefulness of such methods for conceptual design activities, deficiencies exist in some areas. Thus, a second phase of research was conducted in which a better understanding was sought for the reasons behind the successes and failures of the methods considered, particularly for the cases at hypersonic Mach numbers. This second phase involved using computational fluid dynamics methods to examine the flow fields in detail. Through these detailed predictions, the deficiencies in the simple surface inclination methods were determined. In the third phase of this work, an improvement to the surface inclination methods was developed. This used a novel method for including viscous effects by modifying the geometry to include the viscous/shock layer.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-CR-193033 , NAS 1.26:193033
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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