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  • ENERGY PRODUCTION AND CONVERSION  (3)
  • Thermophile  (2)
  • Agave tequilana  (1)
  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Isolation of auxotrophic and antimetabolite-resistant mutants of the hyperthermophilic bacterium Thermotoga neapolitana (1994)
    Springer
    Archives of microbiology 162 (1994), S. 357-361 
    Details
    ISSN: 1432-072X
    Keywords: Thermotoga neapolitana ; Thermophile ; Anaerobe ; Auxotrophs ; Antimetabolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Antimetabolite-resistant and auxotrophic mutants of the hyperthermophilic bacterium Thermotoga neapolitana were isolated to provide strains with genetic backgrounds amenable to genetic analyses. Norleucine, azaleucine, 4-nitropyridine-N-oxide, and 3-amino-1, 2, 4-triazole did not affect growth, while 5-fluorouracil (5 μg/ml), 5-methyltryptophan (250μg/ml), 6-azauracil (100 μg/ml), and 4-fluorophenylalanine (30 μg/ml) inhibited growth at the indicated minimum inhibitory concentrations. The effect of 5-fluorouracil was analyzed and found to be bacteriostatic. These inhibitors were used to select spontaneously arising resistant mutants. In addition, auxotrophic mutants requiring leucine, tryptophan, adenine, and histidine were isolated following mutagenesis with ethyl methanesulfonate. Six other auxotrophs with undefined growth requirements were also isolated. These strains will be useful for the development of genetic methods for T. neapolitana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263784
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of auxotrophic and antimetabolite-resistant mutants of the hyperthermophilic bacterium Thermotoga neapolitana (1994)
    Springer
    Archives of microbiology 162 (1994), S. 357-361 
    Details
    ISSN: 1432-072X
    Keywords: Key words     Thermotoga neapolitana ; Thermophile ; Anaerobe ; Auxotrophs ; Antimetabolites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract      Antimetabolite-resistant and auxotrophic mutants of the hyperthermophilic bacterium Thermotoga neapolitana were isolated to provide strains with genetic backgrounds amenable to genetic analyses. Norleucine, azaleucine, 4-nitropyridine-N-oxide, and 3-amino-1, 2, 4-triazole did not affect growth, while 5-fluorouracil (5 μg/ml), 5-methyltryptophan (250 μg/ml), 6-azauracil (100 μg/ml), and 4-fluorophenylalanine (30 μg/ml) inhibited growth at the indicated minimum inhibitory concentrations. The effect of 5-fluorouracil was analyzed and found to be bacteriostatic. These inhibitors were used to select spontaneously arising resistant mutants. In addition, auxotrophic mutants requiring leucine, tryptophan, adenine, and histidine were isolated following mutagenesis with ethyl methanesulfonate. Six other auxotrophs with undefined growth requirements were also isolated. These strains will be useful for the development of genetic methods for T. neapolitana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050150
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  • 3
    Electronic Resource
    Electronic Resource
    Glutamate dehydrogenase activity in normal and vitrified plants of Agave tequilana Weber propagated in vitro (1990)
    Springer
    Plant cell, tissue and organ culture 22 (1990), S. 147-151 
    Details
    ISSN: 1573-5044
    Keywords: Agave tequilana ; gelrite ; glutamate dehydrogenase ; vitrification ; water potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Agave tequilana stem explants were used to produce adventitious shoots under a set of different water potentials induced by different concentrations of gelrite in the medium. At high water potentials all shoots were vitrified; as the medium water potential became more negative the degree of vitrification decreased but the number of shoots per explant also diminished. The enzymes NADH and NAD-GDH (EC. 1.4.1.2) were measured along the water potential gradient. GDH activity was high in the non-vitrified tissues and decreased significantly in the vitrified ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043690
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  • 4
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    Performance, defect behavior and carrier enhancement in low energy, proton irradiated p+nn+ InP solar cells (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The highest AMO efficiency (19.1 percent) InP solar cell consisted of an n+pp+ structure epitaxially grown on a p+ InP substrate. However, the high cost and relative fragility of InP served as motivation for research efforts directed at heteroepitaxial growth of InP on more viable substrates. The highest AMO efficiency (13.7 percent) for this type of cell was achieved using a GaAs substrate. Considering only cost and fracture toughness, Si would be the preferred substrate. The fact that Si is a donor in InP introduces complexities which are necessary in order to avoid the formation of an efficiency limiting counterdiode. One method used to overcome this problem lies in employing an n+p+ tunnel junction in contact with the cell's p region. A simpler method consists of using an n+ substrate and processing the cell in the p+ nn+ configuration. This eliminates the need for a tunnel junction. Unfortunately, the p/n configuration has received relatively little attention the best cell with this geometry having achieved an efficiency of 17 percent. Irradiation of these homoepitaxial cells, with 1 Mev electrons, showed that they were slightly more radiation resistant than diffused junction n/p cells. Additional p/n InP cells have been processed by some activity aimed at diffusion. Currently, there has been some activity aimed at producing heteroepitaxial p+nn+ InP cells using n+ Ge substrates. Since, like Si, Ge is an n-dopant in InP, use of this configuration obviates the need for a tunnel junction. Obviously, before attempting to process heteroepitaxial cells, one must produce a reasonably good homoepitaxial cell. In the present case we focus our attention on homoepitaxially on an n+ Ge substrate.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Proceedings of the 13th Space Photovoltaic Research and Technology Conference (SPRAT 13); p 149-158
    Format: application/pdf
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  • 5
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    Electrochemical characterization of InP structures (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Electrochemical (EC) techniques represent a simple and yet accurate method to characterize InP and related materials structures. With EC techniques, uncertainties in the measurements arising from factors such as surface effects, the composition and thickness of a front dead layer, the contacts, etc., can be significantly reduced when both a suitable electrolyte is used and the measuring conditions are carefully selected. In this work, the use of photoelectrochemical techniques with InP structures is reported. The work focuses on both the characterization and the optimization of structures grown by thermal diffusion and by epitaxial methods. Characterization of the structures is done by studying the variation in the density of surface states, number of defects, and net majority carrier concentration as a function of material removed. A step-by-step optimization process of n(sup +)p and p(sup+)n InP structures is also described. This involves the passivation and subsequent removal of damaged layers in order to extract the performance parameters of solar cells fabricated with these structures.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Twelfth Space Photovoltaic Research and Technology Conference (SPRAT 12); p 8
    Format: text
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  • 6
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    Progress in p(+)n InP solar cells fabricated by thermal diffusion (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: In SPRAT XI, we proposed that p(sup +)n diffused junction InP solar cells should exhibit a higher conversion efficiency than their n(sup +)p counterparts. This was mainly due to the fact that our p(sup +)n (Cd,S) cell structures consistently showed higher V (sub OC) values than our n(sup +)p (S,Cd) structures. The highest V(sub OC) obtained with the p(sup +)n (Cd,S) cell configuration was 860 mV, as compared to the highest V(sub OC) 840 mV obtained with the n(sup +)p (S,Cd) configuration (AMO, 25 C). In this work, we present the performance results of our most recent thermally diffused cells using the p(sup +)n (Cd,S) structure. We have been able to fabricate cells with V(sub OC) values approaching 880 mV. Our best cell with an unoptimized front contact grid design (GS greater than or equal to 10%) showed a conversion efficiency of 13.4% (AMO, 25 C) without an AR coating layer. The emitter surface was passivated by a -50A P rich oxide. Achievement of such high V(sub OC) values was primarily due to the fabrication of emitter surfaces, having EPD densities as low as 2E2 cm(sup -2) and N(sub a)N(sub d) of about 3E18 cm (sup -3). In addition, our preliminary investigation of p(sup +)n structures seem to suggest that Cd-doped emitter cells are more radiation resistant than Zn-doped emitter cells against both high energy electron and proton irradiation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Twelfth Space Photovoltaic Research and Technology Conference (SPRAT 12); p 7
    Format: text
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