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  • 1
    Publication Date: 1999-03-19
    Description: In higher plants, organogenesis occurs continuously from self-renewing apical meristems. Arabidopsis thaliana plants with loss-of-function mutations in the CLAVATA (CLV1, 2, and 3) genes have enlarged meristems and generate extra floral organs. Genetic analysis indicates that CLV1, which encodes a receptor kinase, acts with CLV3 to control the balance between meristem cell proliferation and differentiation. CLV3 encodes a small, predicted extracellular protein. CLV3 acts nonautonomously in meristems and is expressed at the meristem surface overlying the CLV1 domain. These proteins may act as a ligand-receptor pair in a signal transduction pathway, coordinating growth between adjacent meristematic regions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fletcher, J C -- Brand, U -- Running, M P -- Simon, R -- Meyerowitz, E M -- New York, N.Y. -- Science. 1999 Mar 19;283(5409):1911-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10082464" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/*cytology/genetics/growth & development/metabolism ; *Arabidopsis Proteins ; Cell Differentiation ; Cell Division ; Cloning, Molecular ; Gene Expression Regulation, Plant ; Genes, Plant ; In Situ Hybridization ; Ligands ; Meristem/*cytology/growth & development/metabolism ; Molecular Sequence Data ; Mutation ; Phenotype ; Plant Proteins/chemistry/genetics/*metabolism ; Plant Shoots/cytology ; RNA, Messenger/genetics/metabolism ; RNA, Plant/genetics/metabolism ; Receptor Protein-Tyrosine Kinases/genetics/metabolism ; Recombinant Fusion Proteins/metabolism ; *Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2000-08-01
    Description: The fate of stem cells in plant meristems is governed by directional signaling systems that are regulated by negative feedback. In Arabidopsis thaliana, the CLAVATA (CLV) genes encode the essential components of a negative, stem cell-restricting pathway. We used transgenic plants overexpressing CLV3 to show that meristem cell accumulation and fate depends directly on the level of CLV3 activity and that CLV3 signaling occurs exclusively through a CLV1/CLV2 receptor kinase complex. We also demonstrate that the CLV pathway acts by repressing the activity of the transcription factor WUSCHEL, an element of the positive, stem cell-promoting pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brand, U -- Fletcher, J C -- Hobe, M -- Meyerowitz, E M -- Simon, R -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):617-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Entwicklungsbiologie, Universitat zu Koln, Gyrhofstrabetae 17, D-50923 Koln, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10915624" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/*cytology/genetics/growth & development/metabolism ; *Arabidopsis Proteins ; Cell Differentiation ; Cell Division ; Down-Regulation ; Feedback ; Gene Expression Regulation, Plant ; Genes, Plant ; Homeodomain Proteins/genetics/metabolism ; In Situ Hybridization ; Membrane Proteins/metabolism ; Meristem/*cytology/metabolism ; Mutation ; Phenotype ; Plant Proteins/genetics/*metabolism ; Plants, Genetically Modified ; RNA, Messenger/genetics/metabolism ; RNA, Plant/genetics/metabolism ; Receptor Protein-Tyrosine Kinases/metabolism ; Signal Transduction ; Stem Cells/*cytology/metabolism ; *Transcription Factors ; Transgenes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 1984-07-13
    Description: During the flight of Spacelab 1 the crew performed a number of experiments to explore changes in vestibular function and visual-vestibular interactions on exposure to microgravity. Measurements were made on the threshold for detection of linear oscillation, vestibulo-ocular reflexes elicited by angular and linear movements, oculomotor and posture responses to optokinetic stimulations, and responses to caloric stimulation. Tests were also conducted on the ground, during the 4 months before and on days 1 to 6 after flight. The most significant result was that caloric mystagmus of the same direction as on the earth could also be evoked in the weightless environment.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉von Baumgarten, R -- Benson, A -- Berthoz, A -- Brandt, T -- Brand, U -- Bruzek, W -- Dichgans, J -- Kass, J -- Probst, T -- Scherer, H -- New York, N.Y. -- Science. 1984 Jul 13;225(4658):208-12.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6610216" target="_blank"〉PubMed〈/a〉
    Keywords: *Acceleration ; *Caloric Tests ; Electrooculography ; Eye Movements ; Head/physiology ; Humans ; Motion Perception/physiology ; Movement ; Nystagmus, Physiologic ; *Space Flight ; *Vestibular Function Tests ; Vestibule, Labyrinth/*physiology ; Visual Perception/*physiology ; Weightlessness
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2913-2914 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The guidance characteristics of three different translation stages for application as the driver in a high precision displacement transducer calibration instrument (measuring laser) were assessed. A high voltage PZT tube, a low voltage three-segment PZT, and a corrugated diaphragm displacement device with a magnetic coil drive were investigated. The maximum yaw and pitch angles of the PZT tube were 8 and 5′′, respectively, for a translation of 3 μm. The maximum guiding deviation of the three-segment PZT for a displacement of 13 μm was 38′′ (yaw) and 17′′ (pitch) when applying the same voltage to all segments. The maximum guiding deviation, however, was able to be reduced to ±0.4′′ by applying different voltages to individual PZT segments. The guiding deviation of a corrugated diaphragm with a magnetic coil drive was ±0.6′′ (yaw) and ±0.4′′ (pitch) for a displacement of ±100 μm. The corrected three-segment PZT as well as the corrugated diaphragm device are suited for application with the measuring laser of this article. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 6305-6316 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Optics Communications 100 (1993), S. 361-373 
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2315
    Keywords: Additional ; Graphics standards ; Graphical Kernel System (GKS) ; Window Systems ; Window Management ; User interface ; Graphical input
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Integrating window management capabilities into general purpose graphics systems like GKS or PHIGS is still an open issue. The main integration strategies depending on the responsibility for resource management, are discussed. The GKS* approach takes the graphics system as client of a window system distributing the resources. Its main idea is to introduce user-initiated dynamic resource distribution into the graphics system's model, which is a fundamental deviation from the philosophy of existing graphics standards. Furthermore the inuut model of GKS* has to be extended for running a graphics system in an environment with shared input devices between different application processes. CR Categories and Subject Descriptors: I.3.2.[Computer Graphics]: Graphics Systems—utilities and standards; I.3.6.[Computer Graphics]: Methodology and Techniques—interaction techniques.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Inorganica Chimica Acta 198-200 (1992), S. 663-669 
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 4 (1991), S. 315-318 
    ISSN: 0925-4005
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
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