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  • ELECTRONIC EQUIPMENT  (7)
  • Méditerranée  (3)
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  • 1
    ISSN: 1573-5117
    Keywords: Bactéries ; Méditerranée ; Exigences nutritionnelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les auteurs comparent un lot de 114 bactéries prélevées dans des eaux eutrophes situées devant le delta du Rhône à deux lots de souches appartenant également au bactérioplancton méditerranéen, le premier prélevé dans des eaux oligotrophes (200 souches), le deuxième constitué par des germes épiphytes-saprophytes d'algues planctoniques (57 souches). Plus de 50% des bactéries épiphytes-saprophytes ont des besoins vitaminiques; peu d'entre elles se développent sur le glucose et les acides organiques; la plupart exigent des milieux complexes. Au contraire, les souches de pleine eau présentent un grand pouvoir de synthèse qui leur permet de croître sur des substrats simples. Dans l'ensemble, le glucose n'est pas un substrat carboné universellement assimilé en présence d'azote minéral, au contraire des acides aminés, qui sont rapidement et efficacement utilisés. Cette utilisation préférentielle des acides aminés serait plus marquée pour les bactéries des eaux oligotrophes que pour celles des eaux eutrophes.
    Notes: Abstract Aerobic heterotrophic bacteria isolated in front of the Rhône outlet. II — Nutritional requirements. Comparison with strains from different origin. One hundred and fourteen bacteria have been isolated from eutrophic surface sea waters sampled in front of the Rhône outlet (Mediterranean Sea). Their vitamins requirements as a whole and growth potentials were studied with the West and Lochead's method. Results are compared with those obtained with 200 strains isolated from oligotrophic surface waters and 57 strains living epiphytically or saprophytically on diatoms sampled offshore. It appears that more than 50% of the epiphytic-saprophytic bacteria require vitamins; a few grow on glucose and organic acids, most need complex media. On the opposite, simple organic substances support the growth of free-living bacterioplankton; this capability obviously results from their high synthetizing power. Data support the opinion that the glucose should not be considered as an usual source of carbon for the bacteria studied as a whole, when a mineral nitrogen source is present. On the contrary, the amino-acids sustain fast growth. Nevertheless this preferential use is more related to the strains sampled in the oligotrophic waters than to those of eutrophic waters.
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  • 2
    ISSN: 1573-5117
    Keywords: Bactéries ; Méditerranée ; Substrats carbonés
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Dans le cadre d'une étude portant sur un lot de 200 bactéries prélevées en surface dans des eaux eutrophes au débouché du Rhône en Méditerranée, les auteurs de carbone de 100 composés organiques appartenant à différentes classes chimiques. Dans l'ensemble, il est apparu que les familles de substances les mieux assimilées sont, par ordre décroissant, les acides gras, utilisés par 55% des souches, les acides aminés aliphatiques (51%), les acides aminés divers (44%), les hydroxyacides (43%), les acides dicarboxyliques (42%), les acides organiques divers (30%), les sucres (28%), les dérivés des sucres (27%), les alcools (21%) et les bases (19%). La plupart des souches étudiées utilisent un nombre élevé de substrats, mais aucun substrat n'apparaît comme universel. A partir de ces résultats et de ceux fournis par la littérature, les auteurs font remarquer que la proline, le glutamate, le pyruvate et le succinate sont les substrats les plus fréquemment utilisés, à la fois par les bactéries du plancton et par celles des sédiments côtiers et profonds. Ils en concluent que ces composés pourraient remplacer avantageusement le glucose lors des mesures du taux d'assimilation hétérotrophe des bactéries in situ.
    Notes: Abstract Aerobic heterotrophic bacteria isolated in front of the Rhône outlet. III. Organic substrates supporting growth. Two hundred strains of bacteria have been isolated from eutrophic surface waters; the substrates used as the sole source of carbon have been screened within 100 organic compounds belonging to different chemical groups. The fatty acids are the most frequently used substances, being attacked by 55% of the strains. The other compounds are ordered as follows: aliphatic amino-acids (51%), miscellaneous amino-acids (44%), hydroxyacids (43%), dicarboxylic acids (42%), miscellaneous organic acids (30%), carbohydrates (28%), carbohydrates derivatives (27%), alcohols (2i%) and organic bases (19%). Most of the strains attack numerous substrates, but none of these substrates is used by all the bacteria. From the data reported and from those in the literature, it can be stated that prolin, glutamate, pyruvate and succinate are attacked by most of the bacteria sampled both from surface waters and from neritic or deep sea sediments. It is pointed out that the measurements of bacterial heterotrophic assimilation rate should be run using these compounds instead of glucose.
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  • 3
    ISSN: 1573-5117
    Keywords: Battéries ; Méditerranée ; Vitamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les auteurs étudient les besoins vitaminiques de 232 souches bactériennes prélevées dans une zone eutrophe au large du débouché du Rhône et constatent la présence de 26% d'auxotrophes, dont 3.5% requièrent de la vitamine B12 10% de la biotine et 14% de la thiamine. Recherchant la fréquence de la libération de ces vitamines par ces mêmes bactéries, ils observent que 18% d'entre elles libèrent de la thiamine, 26% de la vitamine B12 et 45% de la biotine. Il en résulte que pour ces trois facteurs, le nombre de producteurs est supérieur au nombre de consommateurs. Pour les auteurs, la population bactérienne étudiée concourt avec les autres organismes producteurs, en particuliers les algues, à maintenir une quantité suffisante de facteurs de croissance, encore que, daps la zone côtière étu-diée, l'apport de telles substances par les effluents ou les eaux continentales ne puisse être négligé.
    Notes: Abstract Aerobic heterotrophic bacteria isolated in front of the Rhône outlet. IV. Requirements and production of vitamins. The authors have isolated 232 bacteria, belonging to the usual genera found in sea water, from eutrophic surface sea water and studied their vitamin requirements with special attention to vitamin B12, biotin and thiamin: 26% of the strains require at least one of the 11 growth substances used; 3.5% need vit. B12, 10% biotin and 14% thiamin. With the same bacteria, the authors have screened the vitamin producing strains; results show that 18% of the strains produce thiamin, 26% vit. B12 and 45% biotin. As far as the three main substances are concerned, data support the idea that vitamin producing germs are more numerous than those which require vitamin. In authors' opinion the bacteria play an important role, together with other producers such as algae, in maintaining the growth factors above the limiting concentration required by a normal level of primary production, despite the fact that the non marine sources of vitamins cannot be neglected in the studied area.
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  • 4
    Publication Date: 2019-06-27
    Description: Photon-coupled isolation switch to provide transistor output electrically isolated from driving sources and all other switch terminals
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-80850 , TI-03-66-87
    Format: application/pdf
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  • 5
    Publication Date: 2019-06-27
    Description: Optoelectronic techniques used to develop photon coupled integrated circuit switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-80820 , TI-03-66-134 , QR-2
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  • 6
    Publication Date: 2019-06-27
    Description: Integrated circuit photon coupled isolation switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-84498 , TI-03-67-39
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  • 7
    Publication Date: 2019-06-27
    Description: Design, development, and testing of new integrated circuit switch device
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-88506 , REPT.-03-67-74 , QR-5
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  • 8
    Publication Date: 2019-06-27
    Description: Electro-optic techniques for developing miniature photon-coupled integrated circuit
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-73640 , REPT-03-68-78
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  • 9
    Publication Date: 2019-06-27
    Description: Development of gallium arsenide laser diode with silicon phototransistor for optical isolation switch
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-93668 , TI-03-68-14 , QR-7
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  • 10
    Publication Date: 2019-06-27
    Description: Integrated circuit isolation switch using photon coupling
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-81605 , QR-3 , REPT.-03-66-151
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