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  • 1
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    Swarms: Optimum aggregations of spacecraft (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Swarms are aggregations of spacecraft or elements of a space system which are cooperative in function, but physically isolated or only loosely connected. For some missions the swarm configuration may be optimum compared to a group of completely independent spacecraft or a complex rigidly integrated spacecraft or space platform. General features of swarms are induced by considering an ensemble of 26 swarms, examples ranging from Earth centered swarms for commercial application to swarms for exploring minor planets. A concept for a low altitude swarm as a substitute for a space platform is proposed and a preliminary design studied. The salient design feature is the web of tethers holding the 30 km swarm in a rigid two dimensional array in the orbital plane. A mathematical discussion and tutorial in tether technology and in some aspects of the distribution of services (mass, energy, and information to swarm elements) are included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-163700 , ATR-80(7734)-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Advanced space system concepts and their orbital support needs (1980 - 2000). Volume 3: Detailed data. Part 1: Catalog of initiatives, functional options, and future environments and goals (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The following areas were discussed in relation to a study of the commonality of space vehicle applications to future national needs: (1) index of initiatives (civilian observation, communication, support), brief illustrated description of each initiative, time periods (from 1980 to 2000+) for implementation of these initiatives; (2) data bank of functional system options, presented in the form of data sheets, one for each of the major functions, with the system option for near-term, midterm, and far-term space projects applicable to each subcategory of functions to be fulfilled; (3) table relating initiatives and desired goals (public service and humanistic, materialistic, scientific and intellectual); and (4) data on size, weight and cost estimations.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148710 , ATR-76(7365)-1-VOL-3-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Advanced space system concepts and their orbital support needs (1980 - 2000). Volume 4: Detailed data. Part 2: Program plans and common support needs (a study of the commonality of space vehicle applications to future national needs (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The methodology of alternate world future scenarios is utilized for selecting a plausible, though not advocated, set of future scenarios each of which results in a program plan appropriate for the respective environment. Each such program plan gives rise to different building block and technology requirements, which are analyzed for common need between the NASA and the DoD for each of the alternate world scenarios. An essentially invariant set of system, building block, and technology development plans is presented at the conclusion, intended to allow protection of most of the options for system concepts regardless of what the actual future world environment turns out to be. Thus, building block and technology needs are derived which support: (1) each specific world scenario; (2) all the world scenarios identified in this study; or (3) generalized scenarios applicable to almost any future environment. The output included in this volume consists of the building blocks, i.e.: transportation vehicles, orbital support vehicles, and orbital support facilities; the technology required to support the program plans; identification of their features which could support the DoD and NASA in common; and a complete discussion of the planning methodology.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148708 , ATR-76(7365)-1-VOL-4-PT-2
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    NASA TECHNICAL REPORTS
  • 4
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    Advanced space system concepts and their orbital support needs (1980 - 2000). Volume 1: Executive summary (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The likely system concepts which might be representative of NASA and DoD space programs in the 1980-2000 time period were studied along with the programs' likely needs for major space transportation vehicles, orbital support vehicles, and technology developments which could be shared by the military and civilian space establishments in that time period. Such needs could then be used by NASA as an input in determining the nature of its long-range development plan. The approach used was to develop a list of possible space system concepts (initiatives) in parallel with a list of needs based on consideration of the likely environments and goals of the future. The two lists thus obtained represented what could be done, regardless of need; and what should be done, regardless of capability, respectively. A set of development program plans for space application concepts was then assembled, matching needs against capabilities, and the requirements of the space concepts for support vehicles, transportation, and technology were extracted. The process was pursued in parallel for likely military and civilian programs, and the common support needs thus identified.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148704 , ATR-76(7365)-1-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Advanced space system concepts and their orbital support needs (1980 - 2000). Volume 2: Final report (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results are presented of a study which identifies over 100 new and highly capable space systems for the 1980-2000 time period: civilian systems which could bring benefits to large numbers of average citizens in everyday life, much enhance the kinds and levels of public services, increase the economic motivation for industrial investment in space, expand scientific horizons; and, in the military area, systems which could materially alter current concepts of tactical and strategic engagements. The requirements for space transportation, orbital support, and technology for these systems are derived, and those requirements likely to be shared between NASA and the DoD in the time period identified. The high leverage technologies for the time period are identified as very large microwave antennas and optics, high energy power subsystems, high precision and high power lasers, microelectronic circuit complexes and data processors, mosaic solid state sensing devices, and long-life cryogenic refrigerators.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148703 , ATR-76(7365)-1-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    Lipopolysaccharides of Thiobacillus species containing lipid A with 2,3-diamino-2,3-dideoxyglucose (1987)
    Springer
    Archives of microbiology 149 (1987), S. 106-111 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus ferrooxidans ; Thiobacillus thiooxidans ; Thiobacillus novellus ; Thiobacillus sp. ; Lipid A ; Lipopolysaccharide ; 2,3-Diamino-2,3-dideoxyglucose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides were isolated from two strains of Thiobacillus ferrooxidans and one strain each of Thiobacillus thiooxidans, Thiobacillus novellus and Thiobacillus sp. IFO 14570. Neutral sugars, 2-keto-3-deoxyoctonate, fatty acids and the rare 2,3-diamino-2,3-dideoxyglucose were detected in all lipopolysaccharides. Lipopolysaccharides of both T. ferrooxidans strains contained l-glycero-d-manno-heptose, whereas that of T. thiooxidans contained both l-glycero-d-manno-heptose and d-glycero-d-manno-heptose. On the other hand, heptoses were absent in lipopolysaccharides of T. novellus and Thiobacillus sp. IFO 14570. Lipid A of T. ferrooxidans and T. thiooxidans contained both glucosamine and 2,3-diamino-2,3-dideoxyglucose, in contrast, lipid A of T. novellus and the Thiobacillus sp. IFO 14570 most likely contain only 2,3-diamino-2,3-dideoxyglucose as backbone sugar. Deoxycholate polyacrylamide gel electrophoresis revealed S-type character for all lipopolysaccharides studied. The significance of the lipopolysaccharide composition for taxonomic and phylogenetic questions with regard to thiobacilli is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425074
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical composition of the lipopolysaccharides of Ectothiorhodospira shaposhnikovii, Ectothiorhodospira mobilis, and Ectothiorhodospira halophila (1992)
    Springer
    Archives of microbiology 157 (1992), S. 499-504 
    Details
    ISSN: 1432-072X
    Keywords: Cell wall ; Ecothiorhodospira shaposhnikovii ; Ectothiorhodospira mobilis ; Ectothiorhodospira halophila ; Halophilic bacteria ; Lipopolysaccharide ; Lipid A ; Lipid ADAG ; “Mixed” lipid A ; Phototrophic bacteria ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides were isolated from the moderate halophilic Ectothiorhodospira shaposhnikovii slight to and Ectothiorhodospira mobilis and from the extremely halophilic Ectothiorhodospira halophila by the hot phenol-water and purified by the phenol-chloroform-petroleum ether methods. The isolated lipopolysaccharides of all three species contained 3-deoxy-d-manno-octulosonic acid and d-glycero-d-mannoheptose indicating the existence of a core. They contained additionally glucose and uronic acids (E. shaposhnikovii and E. mobilis) or glucose, uronic acids and threonine (E. halophila). Sodium deoxycholate gel-electrophoresis of the three lipopolysaccharides, each showing only one major band, indicated R-type character of the lipopolysaccharides of the three Ectothiorhodospira species. The lipid A fractions of the lipopolysaccharides from E. shaposhnikovii and E. mobilis represented phosphorylated “mixed” lipid A types with both 2,3-diamino-2,3-dideoxy-d-glucose and d-glucosamine. The lipid A from E. halophila contained also phosphate and 2,3-diamino-2,3-dideoxy-d-glucose but only traces of d-glucosamine, which would indicated lipid ADAG. The fatty acid spectra were characterized by amide-bound 3-OH-10:0 and 3-OH-12:0 (E. shaposhnikovii), 3-OH-10:0 (E. mobilis), or 3-OH-10:0,3-OH-14:0, and 3-oxo-14-0 (E. halophila). The predominant ester-bound fatty acids were 14:0 and 16:0 (E. shaposhnikovii and E. mobilis), or 12:0 and 14:1 (E. halophila).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276769
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  • 8
    Electronic Resource
    Electronic Resource
    Chemical composition of the lipopolysaccharides of Rhodobacter sulfidophilus, Rhodopseudomonas acidophila, and Rhodopseudomonas blastica (1985)
    Springer
    Archives of microbiology 143 (1985), S. 32-36 
    Details
    ISSN: 1432-072X
    Keywords: Lipopolysaccharide ; Lipid A ; Rhodobacter sulfidophilus ; Rhodopseudomonas acidophila ; Rhodopseudomonas blastica ; Phototrophic bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The lipopolysaccharides of Rhodobacter sulfidophilus and the two budding species Rhodopseudomonas acidophila and Rhodopseudomonas blastica were isolated and chemically analyzed. The all have a lipid A backbone structure with glucosamine as the only amino sugar. The lipid A's of Rb. sulfidophilus and Rps. blastica contain phosphate, their fatty acids are characterized by ester-linked, unsubstituted 3-OH-10:0 and amide-linked 3-OH-14:0 (Rb. sulfidophilus) or 3-oxo-14:0 (Rps. blastica). Lipid A of Rps. acidophila is free of phosphate and contains the rare 3-OH-16:0 fatty acid in amide linkage. The lipopolysaccharides of all three species contain 2-keto-3-deoxy-octonate (KDO) but are devoid of heptoses. Neutral sugars with the exception of glucose are lacking in the lipopolysaccharide of Rb. sulfidophilus. This shows a high galacturonic acid content. The lipopolysaccharides of Rps. acidophila and Rps. blastica have neutral sugar spectra indicative for typical O-chains (rhamnose, mannose, galactose, glucose in both species, and in Rps. blastica additionally 2-O-methyl-6-deoxy-hexose). The taxonomic value of the data is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414764
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  • 9
    Electronic Resource
    Electronic Resource
    Lipid A with 2,3-diamino-2,3-dideoxy-glucose in lipopolysaccharides from slow-growing members of Rhizobiaceae and from “Pseudomonas carboxydovorans” (1989)
    Springer
    Archives of microbiology 151 (1989), S. 111-116 
    Details
    ISSN: 1432-072X
    Keywords: Lipid A ; 2,3-Diamino-2,3-dideoxy-glucose ; Slow-growing rhizobia ; Fast growing rhizobia ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipid A's from two Bradyrhizobium species and from the phylogenetically closely related species “Pseudomonas carboxydovorans” were found to contain 2,3-diamino-2,3-dideoxy-glucose as lipid A backbone sugar. In contrast, three representatives of the genus Rhizobium, as well as the phylogenetically related species Agrobacterium tumefaciens, contain solely glucosamine as lipid A backbone sugar. These findings suppor independent studies on the phylogenetical relatedness based on 16S rRNA-data of the genus Bradyrhizobium with “Pseudomonas carboxydovorans“ and Rhodopseudomonas palustris, which form a tight phylogenetical cluster and which all contain the 2,3-diamino-2,3-dideoxy-glucose-containing lipid A. The relatedness of these species to the glucosamine-containing species of the genus Rhizobium and to Agrobacterium tumefaciens is rather distant as documented by 16S rRNA studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414423
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  • 10
    Electronic Resource
    Electronic Resource
    Lipopolysaccharides in four strains of the unicellular cyanobacterium Synechocystis (1980)
    Springer
    Archives of microbiology 127 (1980), S. 217-222 
    Details
    ISSN: 1432-072X
    Keywords: Synechocystis ; Lipopolysaccharide ; Lipid A ; O-Methyl sugars ; Chemotypes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides were found in four strains of Synechocystis. Depending on the strain, they were extracted into either the water or into the phenol phase of phenol-water extracts. The lipopolysaccharides of all four strains contain fucose, mannose, galactose, glucose and glucosamine. l-Glycero-d-mannoheptose and 2-keto-3-deoxyoctonate are lacking. The strain-specific sugars are dominated by O-methyl sugars in three of the four strains: Synechocystis PCC 6803 contains 2,3-di-O-methyl-fucose, 2-O-methyl-fucose and 2-O-methylxylose. In Synechocystis PCC 6807 a 6-O-methylheptose and 2-O-methyl-mannose, in Synechocystis PCC 6308 2-O-methyl-mannose was identified. Lipid A, although difficult to be split off from the polysaccharide moiety, is indicated in all four strains by the presence of β-hydroxypalmitic and β-hydroxymyristic acids and of glucosamine. In addition, a branched β-hydroxypentadecanoic acid (anteiso) was found. The phosphorus content of the four lipopolysaccharides amounts to less than 0.3% of dry weight. The lipopolysaccharides from Synechocystis show O-specific activity. Their reactivity in homologous O-antisera, however, is low when tested by passive hemagglutination. In immunoelectrophoresis, no migration of lipopolysaccharide was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427196
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