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  • AIRCRAFT COMMUNICATIONS AND NAVIGATION  (12)
  • Glutamine synthetase  (3)
  • AIRCRAFT STABILITY AND CONTROL  (2)
  • Metallocenes  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Higher-valent derivatives of the d-metal acids - XII. α-Phosphonio(methylidene) complexes of niobium and tantalum containing the metallocene-like [(η^5-C"5R"5)M(N^tBu)] core
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 475 (1994), S. 157-166 
    Details
    ISSN: 0022-328X
    Keywords: Imide ; Metallocenes ; Niobium ; Phosphorus ; Tantalum ; Ylide
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-328X(94)84018-0
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hohervalente derivate der d-metall-sauren X. Imidokomplexe des funf- und vierwertigen niobs und tantals mit halbsandwich- und metallocen- struktur
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 472 (1994), S. 127-138 
    Details
    ISSN: 0022-328X
    Keywords: Halfsandwich complexes ; Imido ; Metallocenes ; Niobium: Tantalum
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-328X(94)80200-9
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Factors involved in the coordinate appearance of nitrite reductase and glutamine synthetase in the mustard (Sinapis alba L.) seedling (1990)
    Springer
    Planta 180 (1990), S. 429-434 
    Details
    ISSN: 1432-2048
    Keywords: Glutamine synthetase ; Nitrate (as inductor) ; Nitrite reductase ; Phytochrome (as inductor) ; Sinapis (nitrate assimilation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extent to which the appearances of nitrite reductase (NIR; EC 1.7.7.1) and glutamine synthetase (GS; EC 6.3.1.2) are coordinated was studied in mustard (Sinapis alba L.) seedlings. It was established by immunotitration that the increased activities of NIR and GS in the presence of light and nitrate can be attributed to the de-novo synthesis of enzyme protein. The bulk of the NIR and GS was found in the developing cotyledons. In the absence of nitrate in the growth medium there was no coordinate appearance of NIR and GS. While light strongly stimulated the appearance of GS, the level of NIR was hardly affected and remained low. On the other hand, in the presence of nitrate in the medium the appearances of NIR and GS were strictly coordinated, the GS level being considerably above that of NIR. It is argued that phytochrome-controlled synthesis of GS in the absence of nitrate is part of the mechanism to reassimilate ammonium liberated during proteolysis of storage protein and metabolism of the resulting amino acids, whereas the strictly coordinated synthesis in the presence of light and nitrate indicates the dominance of nitrate assimilation under these circumstances. The fact that the level of GS was always considerably above that of NIR appears to be a safety measure to prevent ammonium accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198796
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regulation of the appearance of glutamine synthetase in mustard (Sinapis alba L.) cotyledons by light, nitrate and ammonium (1989)
    Springer
    Planta 177 (1989), S. 526-534 
    Details
    ISSN: 1432-2048
    Keywords: Ammonium assimilation ; Glutamine synthetase ; Nitrate ; Phytochrome ; Sinapis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During transformation of mustard seedlings cotyledons from storage organs to photosynthetically competent leaves, a process which occurs during the first 4 d after sowing, total glutamine-synthetase (GS, EC 6.3.1.2) activity increases from zero to the high level usually observed in green leaves. In the present study we have used ion-exchange chromatography to separate possible isoforms of GS during the development of the cotyledons. The approach failed since we could only detect a single form of GS, presumably plastidic GS, under all circumstances tested. The technique of selective photooxidative destruction of plastids in situ was applied to solve the problem of GS localization. It was inferred from the data that the GS as detected by ion-exchange chromatography is plastidic GS. The regulatory role, if any, of light, nitrate and ammonium in the process of the appearance of GS in the developing cotyledons was investigated. The results show that nitrate and ammonium play only minor roles. Light, operating via phytochrome, is the major regulatory factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392621
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Factors involved in the coordinate appearance of nitrite reductase and glutamine synthetase in the mustard (Sinapis alba L.) seedling (1990)
    Springer
    Planta 180 (1990), S. 429-434 
    Details
    ISSN: 1432-2048
    Keywords: Glutamine synthetase ; Nitrate (as inductor) ; Nitrite reductase ; Phytochrome (as inductor) ; Sinapis (nitrate assimilation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extent to which the appearances of nitrite reductase (NIR; EC 1.7.7.1) and glutamine synthetase (GS; EC 6.3.1.2) are coordinated was studied in mustard (Sinapis alba L.) seedlings. It was established by immunotitration that the increased activities of NIR and GS in the presence of light and nitrate can be attributed to the de-novo synthesis of enzyme protein. The bulk of the NIR and GS was found in the developing cotyledons. In the absence of nitrate in the growth medium there was no coordinate appearance of NIR and GS. While light strongly stimulated the appearance of GS, the level of NIR was hardly affected and remained low. On the other hand, in the presence of nitrate in the medium the appearances of NIR and GS were strictly coordinated, the GS level being considerably above that of NIR. It is argued that phytochrome-controlled synthesis of GS in the absence of nitrate is part of the mechanism to reassimilate ammonium liberated during proteolysis of storage protein and metabolism of the resulting amino acids, whereas the strictly coordinated synthesis in the presence of light and nitrate indicates the dominance of nitrate assimilation under these circumstances. The fact that the level of GS was always considerably above that of NIR appears to be a safety measure to prevent ammonium accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160400
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    Paper (German National Licenses)
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  • 6
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    A Kalman filter algorithm for terminal-area navigation with sensors of moderate accuracy (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Translational state estimation in terminal area operations, using a set of commonly available position, air data, nd acceleration sensors, is described. Kalman filtering is applied to obtain maximum estimation occuracy from the sensors but feasibility in real-time computations requires a variety of approximations and devices aimed at minimizing the required computation time with only negligible loss of accuracy. Accuracy behavior throughout the terminal area, its relation to sensor accuracy, its effect on trajectory tracking errors and control activity in an automatic flight control system, and its adequacy in terms of existing criteria for various terminal area operations are examined. The principal investigative tool is a simulation of the system. Previously announced in STAR as N83-29193
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 6; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Discovery of the Kalman filter as a practical tool for aerospace and industry (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The sequence of events which led the researchers at Ames Research Center to the early discovery of the Kalman filter shortly after its introduction into the literature is recounted. The scientific breakthroughs and reformulations that were necessary to transform Kalman's work into a useful tool for a specific aerospace application are described. The resulting extended Kalman filter, as it is now known, is often still referred to simply as the Kalman filter. As the filter's use gained in popularity in the scientific community, the problems of implementation on small spaceborne and airborne computers led to a square-root formulation of the filter to overcome numerical difficulties associated with computer word length. The work that led to this new formulation is also discussed, including the first airborne computer implementation and flight test. Since then the applications of the extended and square-root formulations of the Kalman filter have grown rapidly throughout the aerospace industry.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TM-86847 , REPT-85424 , NAS 1.15:86847
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Navigation systems for approach and landing of VTOL aircraft (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The formulation and implementation of navigation systems used for research investigations in the V/STOLAND avionics system are described. The navigation systems prove position and velocity in a cartestian reference frame aligned with the runway. They use filtering techniques to combine the raw position data from navaids (e.g., TACAN, MLS) with data from onboard inertial sensors. The filtering techniques which use both complementary and Kalman filters, are described. The software for the navigation systems is also described.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-152335 , AMA-79-15
    Format: application/pdf
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  • 9
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    Development and evaluation of a Kalman-filter algorithm for terminal area navigation using sensors of moderate accuracy (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Translational state estimation in terminal area operations, using a set of commonly available position, air data, and acceleration sensors, is described. Kalman filtering is applied to obtain maximum estimation accuracy from the sensors but feasibility in real-time computations requires a variety of approximations and devices aimed at minimizing the required computation time with only negligible loss of accuracy. Accuracy behavior throughout the terminal area, its relation to sensor accuracy, its effect on trajectory tracking errors and control activity in an automatic flight control system, and its adequacy in terms of existing criteria for various terminal area operations are examined. The principal investigative tool is a simulation of the system.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TP-2035 , A-8955 , NAS 1.60:2035
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Simulation, guidance and navigation of the B-737 for rollout and turnoff using MLS measurements (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simulation program is described for the B-737 aircraft in landing approach, a touchdown, rollout and turnoff for normal and CAT III weather conditions. Preliminary results indicate that microwave landing systems can be used in place of instrument landing systems landing aids and that a single magnetic cable can be used for automated rollout and turnoff. Recommendations are made for further refinement of the model and additional testing to finalize a set of guidance laws for rollout and turnoff.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-144959 , AMA-75-40
    Format: application/pdf
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