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  • Launch Vehicles and Launch Operations  (2)
  • Filamentous fungus  (1)
  • G418 resistance  (1)
  • Key words Mating type  (1)
Collection
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Gene 103 (1991), S. 125-130 
    ISSN: 0378-1119
    Keywords: Filamentous fungus ; G418 resistance ; extrachromosomal vector ; fungal genes ; recombinant DNA ; wood-rotting fungi
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Keywords: Key words Mating type ; Neurospora ; Variable regions ; Repeats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Complexity in and around the A and a mating type idiomorphs in Neurospora crassa was examined. Six sets of transcripts surrounding the idiomorphs were identified by Northern analysis. Several different patterns of regulation were observed. The two pairs of transcripts closest to the centromere-proximal idiomorph flanks (variable regions) exhibited mating type-specific size differences. DNA sequence was obtained for the region surrounding the four transcripts which showed mating type-specific size and expression. One of these pairs encoded amino acid sequences highly similar to a domain present in the plasma membrane ATPase. A mutant allele of one of these genes was induced by repeat-induced point mutation (RIP), which resulted in altered perithecial development and the elimination of ascospore production. These transcripts comprise a cluster of genes which may be involved in the control of mating and sexual development in N. crassa.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2019-07-13
    Description: Horizontal launch has been investigated for 60 years by over 130 different studies. During this time only one concept, Pegasus, has ever been in operation. The attractiveness of horizontal launch is the capability to provide a "mobile launch pad" that can use existing aircraft runways, cruise above weather, loiter for mission instructions, and provide precise placement for orbital intercept, rendezvous, or reconnaissance. A jointly sponsored study by DARPA and NASA, completed in 2011, explored the trade space of horizontal launch system concepts which included an exhaustive literature review of the past 70 years. The Horizontal Launch Study identified potential near- and mid-term concepts capable of delivering 15,000 lb payloads to a 28.5 due East inclination, 100 nautical-mile low-Earth orbit. Results are presented for a range of near-term system concepts selected for their availability and relatively low design, development, test, and evaluation (DDT&E) costs. This study identified a viable low-cost development path forward to make a robust and resilient horizontal launch capability a reality.
    Keywords: Launch Vehicles and Launch Operations
    Type: E-18513 , AIAA SPACE 2012 Conference and Exposition; Sep 11, 2012 - Sep 13, 2012; Pasadena, CA; United States
    Format: application/pdf
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  • 4
    Publication Date: 2019-08-26
    Description: The vision of horizontal launch is the capability to provide a mobile launch pad that can use existing aircraft runways, cruise above weather, loiter for mission instructions, and achieve precise placement for orbital intercept, rendezvous, or reconnaissance. Another compelling benefit of horizontal launch is that today s ground-based vertical launch pads are a single earthquake, hurricane, or terrorist attack away from disruption of critical U.S. launch capabilities. The study did not attempt to design a new system concept for horizontal launch, but rather focused on the refinement of many previously-studied horizontal launch concepts. Because of the large number of past horizontal launch studies, a process was developed to narrow the number of concepts through prescreening, screening, and evaluation of point designs. The refinement process was not intended to select the "best" concept, but rather to establish the feasibility of horizontal launch from a balanced assessment of figures of merit and to identify potential concepts that warrant further exploration.
    Keywords: Launch Vehicles and Launch Operations
    Type: NASA/SP-2011-215994 , DFRC-E-DAA-TN4418
    Format: application/pdf
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