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  • 2000-2004
  • 1990-1994  (10)
  • 1992  (3)
  • 1991  (7)
  • 1
    ISSN: 1432-2048
    Keywords: Actin ; Calmodulin ; Ernodesmis ; Microfilament ; Microtubule ; Tubulin ; Wound healing (alga)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The involvement of calmodulin (CaM) in wound-induced cytoplasmic contractions in E. verticillata was investigated. Indirect immunofluorescence of CaM in intact cells showed a faint, reticulate pattern of fluorescence in the cortical cytoplasm. Diffuse fluorescence was evident deeper within the cytoplasm. In contracted cells, CaM co-localizes with actin in the cortical cytoplasm in extensive, longitudinal bundles of microfilaments (MFs), and in an actin-containing reticulum. No association of CaM with tubulin was ever observed in the cortical cytoplasm at any stage of wound-healing. When contraction rates in wounded cells are measured, a lag period of 2 min is followed by a rapid, steady rate of movement over the subsequent 10 min. The delay in the initiation of longitudinal contraction corresponds to the time necessary for the assembly of the longitudinal MF bundles. Cytoplasmic motility was inhibited in a dose-dependent manner by CaM antagonists. In these inhibited cells, MF bundles did not assemble, or were poorly formed. In the latter case, CaM was always found associated with MFs. These results indicate a direct spatial and temporal correlation between CaM and actin, and a potential role for CaM in regulating the formation of functional MF bundles during wound-induced cytoplasmic contraction in Ernodesmis.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Actin ; Calmodulin ; Ernodesmis ; Membrane skeleton ; Microfilaments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultrastructural changes in the cortical cytoskeleton during wound-induced cytoplasmic contraction were examined in the coenocytic green alga Ernodesmis verticillata. Both calmodulin (CaM) and actin were localized in intact and contracting cells by immunogold labeling. Within 5 min after wounding, compact microfilament (MF) bundles were observed which increase in diameter as cytoplasmic contraction proceeds. Calmodulin labeling is associated with amorphous material studding the MF bundles, whereas actin labeling occurs along the individual MFs. No MF bundles were ever observed during contraction that were not also labeled with anti-CaM antibodies. In cells treated with the CaM antagonist W-7 (N-[6-aminohexyl]-5-chloro-1-naphtha-lenesulfonamide), MF bundles do not form, and the formation of loosely arranged MFs (similar to nascent bundles in untreated cells) is greatly retarded. We propose that CaM binds indirectly to actin by activating an actin-binding regulatory protein which functions in early stages of the transduction sequence leading to functional MF bundles. Additionally, ultrastructural evidence is presented for a plasma-membrane skeleton or undercoating in this alga.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 606 (1991), S. 141-155 
    ISSN: 0044-2313
    Keywords: Neopentylruthenium(II) complexes ; H—C bond cleavage ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: H—C Bond Cleavage in Aldehydes by Neopentylruthenium(II) ComplexesNeopentylruthenium complexes of the type (η5-Cp)(L1)(L2)RuCH2CMe3 (1: Cp = C5Me5, L1 = L2 = PMe3; 3, 9, 10 and 11: Cp = C5H5, L2 = PPh3, L1 = PMe3, PMePh2, PMe2Ph and P(OMe)3, respectively) react with benzaldehyde with H—C bond cleavage of the aldehyde function to give the (η5-Cp)(L1)(L2)Ru benzoyl compounds 4, 13-16 and as the result of subsequent decarbonylation the (carbonyl) phenylruthenium complexes 2, 5, 12, 17-19 or mixtures thereof. Para phthaldialdehyde reacts with 1 (ratio 1 : 2) via the carbonyl complex 20 to give the 1,4-bis(ruthenium)benzene compound 21. Aliphatic aldehydes behave similarly: isobutyraldehyde reacts with 3 to give a mixture of the acyl-(22) and alkyl(carbonyl)ruthenium compound 23. 1 reacts with ferrocenealdehyde to give the carbonyl(ferrocenyl)ruthenium complex 25. The molecular structures of 22 and 2 as representatives of acyl- and (carbonyl)organylruthenium complexes, have been determined by X-ray diffraction.
    Notes: Die Neopentylruthenium-Komplexe vom Typ (η5-Cp)(L1)(L2)RuCH2CMe3 (1: Cp = C5Me5, L1 = L2 = PMe3; 3, 9, 10 und 11: Cp = C5H5, L2 = PPh3, L1 = PMe3, PMePh2, PMe2Ph bzw. P(OMe)3) reagieren mit Benzaldehyd unter H—C-Bindungsspaltung an der Aldehydgruppe und anschließender Decarbonylierung zu den entsprechenden Phenylruthenium-Verbindungen (η5-Cp)(CO)(L1)RuPh 2, 5, 12, 17-19 oder zu Mischungen dieser Komplexe mit den Benzoylruthenium-Verbindungen (η5-Cp)(L1)(L2)RuC(O)Ph 4, 13-16, den Vorstufen der Decarbonylierung. Para-Phthaldialdehyd reagiert mit 1 (Verhältnis 1 : 2) über den Carbonylkomplex 20 zum 1,4-Bis(ruthenium)benzol 21. Aliphatische Aldehyde verhalten sich ähnlich wie aromatische, Isobutyraldehyd bildet mit 3 eine Mischung von Acyl- (22) und Alkyl(carbonyl)ruthenium-Verbindung 23. 1 reagiert mit Ferrocenaldehyd zum Carbonyl(ferrocenyl)ruthenium-Komplex 25. Für 22 und 2 als Vertreter der Acyl- und der (Carbonyl)phenylruthenium-Komplexe wurden die Molekülstrukturen röntgenographisch bestimmt.
    Additional Material: 2 Ill.
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  • 4
    Publication Date: 1991-12-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 5
    Publication Date: 1991-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 6
    Publication Date: 1991-12-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 7
    Publication Date: 2006-06-13
    Description: Laboratory test results of the initialization and tracking performance of an existing inertial-sensor-based instrument are given. The instrument, although not primarily designed for precision antenna pointing applications, demonstrated an on-average 10-hour tracking error of several millidegrees. The system-level instrument performance is shown by analysis to be sensor limited. Simulated instrument improvements show a tracking error of less than 1 mdeg, which would provide acceptable performance, i.e., low pointing loss, for the DSN 70-m antenna sub network, operating at Ka-band (1-cm wavelength).
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: The Telecommunications and Data Acquisition Report; p 94-104
    Format: text
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  • 8
    Publication Date: 2013-08-31
    Description: The alignment and X-ray imaging performance of the Advanced X-ray Astrophysics Facility (AXAF) Verification Engineering Test Article-I (VETA-I) was measured by the VETA-I X-Ray Detection System (VXDS). The VXDS was based on the X-ray detection system utilized in the AXAF Technology Mirror Assembly (TMA) program, upgraded to meet the more stringent requirements of the VETA-I test program. The VXDS includes two types of X-ray detectors: (1) a High Resolution Imager (HRI) which provides X-ray imaging capabilities, and (2) sealed and flow proportional counters which, in conjunction with apertures of various types and precision translation stages, provide the most accurate measurement of VETA-I performance. Herein we give an overview of the VXDS hardware including X-ray detectors, translation stages, apertures, proportional counters and flow counter gas supply system and associated electronics. We also describe the installation of the VXDS into the Marshall Space Flight Center (MSFC) X-Ray Calibration Facility (XRCF). We discuss in detail the design and performance of those elements of the VXDS which have not been discussed elsewhere; translation systems, flow counter gas supply system, apertures and thermal monitoring system.
    Keywords: OPTICS
    Type: VETA-I X Ray Test Analysis; 15 p
    Format: application/pdf
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  • 9
    Publication Date: 2019-06-28
    Description: The X-ray detection system used to calibrate the Advanced X-ray Astrophysics Facility (AXAF) mirrors will include gas flow and sealed proportional counters. To meet the ultimate 1 percent goal of the calibration project, the transmission and uniformity of the windows must be well known for the soft X-ray wavelengths involved. Various window materials for use with proportional counters are examined for transmission at X-ray wavelengths in the range of 0.1 to 5.9 keV. These include the usual window materials (polypropylene and beryllium), as well as materials only recently employed for detector applications (polyimide and diamond). The transmission uniformity of beryllium at 1.49 keV is examined with a microchannel plate detector, producing a 'shadowgraph' of the window material illuminated with soft X-rays. This technique allows us to investigate nonuniformities on a spatial scale of about .2 mm.
    Keywords: OPTICS
    Type: In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93-34376 13-35); p. 395-407.
    Format: text
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  • 10
    Publication Date: 2019-08-13
    Description: Laboratory test results of the initialization and tracking performance of an existing inertial-sensor-based instrument are given. The instrument, although not primarily designed for precision antenna pointing applications, demonstrated an on-average 10-hour tracking error of several millidegrees. The system-level instrument performance is shown by analysis to be sensor limited. Simulated instrument improvements show a tracking error of less than 1 mdeg, which would provide acceptable performance, i.e., low pointing loss, for the Deep Space Network 70-m antenna subnetwork, operating at Ka-band (1-cm wavelength).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Telecommunications and Data Acquisition Report 42-109: January-March 1992; 94-104
    Format: application/pdf
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