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  • 1
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    Siderophore-mediated iron transport: crystal structure of FhuA with bound lipopolysaccharide (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-12-18
    Description: FhuA, the receptor for ferrichrome-iron in Escherichia coli, is a member of a family of integral outer membrane proteins, which, together with the energy-transducing protein TonB, mediate the active transport of ferric siderophores across the outer membrane of Gram-negative bacteria. The three-dimensional structure of FhuA is presented here in two conformations: with and without ferrichrome-iron at resolutions of 2.7 and 2.5 angstroms, respectively. FhuA is a beta barrel composed of 22 antiparallel beta strands. In contrast to the typical trimeric arrangement found in porins, FhuA is monomeric. Located within the beta barrel is a structurally distinct domain, the "cork," which mainly consists of a four-stranded beta sheet and four short alpha helices. A single lipopolysaccharide molecule is noncovalently associated with the membrane-embedded region of the protein. Upon binding of ferrichrome-iron, conformational changes are transduced to the periplasmic pocket of FhuA, signaling the ligand-loaded status of the receptor. Sequence homologies and mutagenesis data are used to propose a structural mechanism for TonB-dependent siderophore-mediated transport across the outer membrane.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ferguson, A D -- Hofmann, E -- Coulton, J W -- Diederichs, K -- Welte, W -- New York, N.Y. -- Science. 1998 Dec 18;282(5397):2215-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, Quebec, Canada H3A 2B4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9856937" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Outer Membrane Proteins/*chemistry/metabolism ; Bacterial Proteins/chemistry/metabolism ; Binding Sites ; Biological Transport, Active ; Cell Membrane/chemistry/metabolism ; Crystallography, X-Ray ; Diffusion ; Escherichia coli/*chemistry/metabolism ; *Escherichia coli Proteins ; Ferric Compounds/*metabolism ; Ferrichrome/*metabolism ; Hydrogen Bonding ; Ligands ; Lipopolysaccharides/*metabolism ; Membrane Proteins/chemistry/metabolism ; Models, Molecular ; *Protein Conformation ; Protein Structure, Secondary ; Receptors, Virus/*chemistry/metabolism ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Structural basis of gating by the outer membrane transporter FecA (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-02
    Description: Siderophore-mediated acquisition systems facilitate iron uptake. We present the crystallographic structure of the integral outer membrane receptor FecA from Escherichia coli with and without ferric citrate at 2.5 and 2.0 angstrom resolution. FecA is composed of three distinct domains: the barrel, plug, and NH2-terminal extension. Binding of ferric citrate triggers a conformational change of the extracellular loops that close the external pocket of FecA. Ligand-induced allosteric transitions are propagated through the outer membrane by the plug domain, signaling the occupancy of the receptor in the periplasm. These data establish the structural basis of gating for receptors dependent on the cytoplasmic membrane protein TonB. By compiling available data for this family of receptors, we propose a mechanism for the energy-dependent transport of siderophores.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ferguson, Andrew D -- Chakraborty, Ranjan -- Smith, Barbara S -- Esser, Lothar -- van der Helm, Dick -- Deisenhofer, Johann -- New York, N.Y. -- Science. 2002 Mar 1;295(5560):1715-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11872840" target="_blank"〉PubMed〈/a〉
    Keywords: Adsorption ; Bacterial Outer Membrane Proteins/chemistry/metabolism ; Bacterial Proteins/metabolism ; Binding Sites ; Biological Transport, Active ; Carrier Proteins/*chemistry/*metabolism ; Cell Membrane/metabolism ; Crystallography, X-Ray ; Escherichia coli Proteins/chemistry/metabolism ; Ferric Compounds/*metabolism ; Hydrogen Bonding ; *Ion Channel Gating ; Ligands ; Membrane Proteins/metabolism ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; *Receptors, Cell Surface ; Siderophores/*metabolism ; Static Electricity
    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
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    Rapid regulation of depression-related behaviours by control of midbrain dopamine neurons (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-12-14
    Description: Ventral tegmental area (VTA) dopamine neurons in the brain's reward circuit have a crucial role in mediating stress responses, including determining susceptibility versus resilience to social-stress-induced behavioural abnormalities. VTA dopamine neurons show two in vivo patterns of firing: low frequency tonic firing and high frequency phasic firing. Phasic firing of the neurons, which is well known to encode reward signals, is upregulated by repeated social-defeat stress, a highly validated mouse model of depression. Surprisingly, this pathophysiological effect is seen in susceptible mice only, with no apparent change in firing rate in resilient individuals. However, direct evidence--in real time--linking dopamine neuron phasic firing in promoting the susceptible (depression-like) phenotype is lacking. Here we took advantage of the temporal precision and cell-type and projection-pathway specificity of optogenetics to show that enhanced phasic firing of these neurons mediates susceptibility to social-defeat stress in freely behaving mice. We show that optogenetic induction of phasic, but not tonic, firing in VTA dopamine neurons of mice undergoing a subthreshold social-defeat paradigm rapidly induced a susceptible phenotype as measured by social avoidance and decreased sucrose preference. Optogenetic phasic stimulation of these neurons also quickly induced a susceptible phenotype in previously resilient mice that had been subjected to repeated social-defeat stress. Furthermore, we show differences in projection-pathway specificity in promoting stress susceptibility: phasic activation of VTA neurons projecting to the nucleus accumbens (NAc), but not to the medial prefrontal cortex (mPFC), induced susceptibility to social-defeat stress. Conversely, optogenetic inhibition of the VTA-NAc projection induced resilience, whereas inhibition of the VTA-mPFC projection promoted susceptibility. Overall, these studies reveal novel firing-pattern- and neural-circuit-specific mechanisms of depression.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3554860/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3554860/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chaudhury, Dipesh -- Walsh, Jessica J -- Friedman, Allyson K -- Juarez, Barbara -- Ku, Stacy M -- Koo, Ja Wook -- Ferguson, Deveroux -- Tsai, Hsing-Chen -- Pomeranz, Lisa -- Christoffel, Daniel J -- Nectow, Alexander R -- Ekstrand, Mats -- Domingos, Ana -- Mazei-Robison, Michelle S -- Mouzon, Ezekiell -- Lobo, Mary Kay -- Neve, Rachael L -- Friedman, Jeffrey M -- Russo, Scott J -- Deisseroth, Karl -- Nestler, Eric J -- Han, Ming-Hu -- F31 MH095425/MH/NIMH NIH HHS/ -- F32 MH096464/MH/NIMH NIH HHS/ -- K99 MH094405/MH/NIMH NIH HHS/ -- R01 MH092306/MH/NIMH NIH HHS/ -- R25 GM064118/GM/NIGMS NIH HHS/ -- T32 MH020016/MH/NIMH NIH HHS/ -- T32 MH087004/MH/NIMH NIH HHS/ -- T32 MH096678/MH/NIMH NIH HHS/ -- England -- Nature. 2013 Jan 24;493(7433):532-6. doi: 10.1038/nature11713. Epub 2012 Dec 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology and Systems Therapeutics, Friedman Brain Institute, Mount Sinai School of Medicine, New York, New York 10029, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23235832" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Depression/etiology/*physiopathology ; Dopaminergic Neurons/*metabolism ; Food Preferences ; Male ; Mesencephalon/*cytology ; Mice ; Neural Pathways ; Nucleus Accumbens/physiology ; Optogenetics ; Phenotype ; Prefrontal Cortex/physiology ; *Social Behavior ; Stress, Psychological/complications/*physiopathology ; Sucrose/administration & dosage ; Time Factors ; Ventral Tegmental Area/physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    beta-catenin mediates stress resilience through Dicer1/microRNA regulation (2014)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2014-11-11
    Description: beta-catenin is a multi-functional protein that has an important role in the mature central nervous system; its dysfunction has been implicated in several neuropsychiatric disorders, including depression. Here we show that in mice beta-catenin mediates pro-resilient and anxiolytic effects in the nucleus accumbens, a key brain reward region, an effect mediated by D2-type medium spiny neurons. Using genome-wide beta-catenin enrichment mapping, we identify Dicer1-important in small RNA (for example, microRNA) biogenesis--as a beta-catenin target gene that mediates resilience. Small RNA profiling after excising beta-catenin from nucleus accumbens in the context of chronic stress reveals beta-catenin-dependent microRNA regulation associated with resilience. Together, these findings establish beta-catenin as a critical regulator in the development of behavioural resilience, activating a network that includes Dicer1 and downstream microRNAs. We thus present a foundation for the development of novel therapeutic targets to promote stress resilience.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4257892/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4257892/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dias, Caroline -- Feng, Jian -- Sun, Haosheng -- Shao, Ning Yi -- Mazei-Robison, Michelle S -- Damez-Werno, Diane -- Scobie, Kimberly -- Bagot, Rosemary -- LaBonte, Benoit -- Ribeiro, Efrain -- Liu, XiaoChuan -- Kennedy, Pamela -- Vialou, Vincent -- Ferguson, Deveroux -- Pena, Catherine -- Calipari, Erin S -- Koo, Ja Wook -- Mouzon, Ezekiell -- Ghose, Subroto -- Tamminga, Carol -- Neve, Rachael -- Shen, Li -- Nestler, Eric J -- P50 MH096890/MH/NIMH NIH HHS/ -- R00 MH094405/MH/NIMH NIH HHS/ -- England -- Nature. 2014 Dec 4;516(7529):51-5. doi: 10.1038/nature13976. Epub 2014 Nov 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA. ; Department of Psychiatry, University of Texas Southwestern, Dallas, Texas 75390, USA. ; Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25383518" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological/genetics ; Animals ; DEAD-box RNA Helicases/*genetics/metabolism ; Depression/physiopathology ; Gene Expression Profiling ; *Gene Expression Regulation ; Genome-Wide Association Study ; Humans ; Male ; Mice ; Mice, Inbred C57BL ; MicroRNAs/*genetics/metabolism ; Neurons/metabolism ; *Resilience, Psychological ; Ribonuclease III/*genetics/metabolism ; Signal Transduction ; Stress, Physiological/*genetics ; beta Catenin/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Crystal structure of inhibitor-bound human 5-lipoxygenase-activating protein (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-06-30
    Description: Leukotrienes are proinflammatory products of arachidonic acid oxidation by 5-lipoxygenase that have been shown to be involved in respiratory and cardiovascular diseases. The integral membrane protein FLAP is essential for leukotriene biosynthesis. We describe the x-ray crystal structures of human FLAP in complex with two leukotriene biosynthesis inhibitors at 4.0 and 4.2 angstrom resolution, respectively. The structures show that inhibitors bind in membrane-embedded pockets of FLAP, which suggests how these inhibitors prevent arachidonic acid from binding to FLAP and subsequently being transferred to 5-lipoxygenase, thereby preventing leukotriene biosynthesis. This structural information provides a platform for the development of therapeutics for respiratory and cardiovascular diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ferguson, Andrew D -- McKeever, Brian M -- Xu, Shihua -- Wisniewski, Douglas -- Miller, Douglas K -- Yamin, Ting-Ting -- Spencer, Robert H -- Chu, Lin -- Ujjainwalla, Feroze -- Cunningham, Barry R -- Evans, Jilly F -- Becker, Joseph W -- New York, N.Y. -- Science. 2007 Jul 27;317(5837):510-2. Epub 2007 Jun 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicinal Chemistry, Merck Research Laboratories, Rahway, NJ 07065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17600184" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Lipoxygenase-Activating Proteins ; Arachidonate 5-Lipoxygenase/metabolism ; Arachidonic Acid/metabolism ; Binding Sites ; Carrier Proteins/antagonists & inhibitors/*chemistry/genetics/metabolism ; Catalytic Domain ; Crystallography, X-Ray ; Cytosol/chemistry ; Humans ; Hydrophobic and Hydrophilic Interactions ; Indoles/*chemistry/metabolism/pharmacology ; Membrane Proteins/antagonists & inhibitors/*chemistry/genetics/metabolism ; Models, Molecular ; Mutagenesis ; Nuclear Envelope/chemistry ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits/chemistry ; Quinolines/*chemistry/metabolism/pharmacology
    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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  • 6
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    BDNF is a negative modulator of morphine action (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-10-09
    Description: Brain-derived neurotrophic factor (BDNF) is a key positive regulator of neural plasticity, promoting, for example, the actions of stimulant drugs of abuse such as cocaine. We discovered a surprising opposite role for BDNF in countering responses to chronic morphine exposure. The suppression of BDNF in the ventral tegmental area (VTA) enhanced the ability of morphine to increase dopamine (DA) neuron excitability and promote reward. In contrast, optical stimulation of VTA DA terminals in nucleus accumbens (NAc) completely reversed the suppressive effect of BDNF on morphine reward. Furthermore, we identified numerous genes in the NAc, a major target region of VTA DA neurons, whose regulation by BDNF in the context of chronic morphine exposure mediated this counteractive function. These findings provide insight into the molecular basis of morphine-induced neuroadaptations in the brain's reward circuitry.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3547365/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3547365/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koo, Ja Wook -- Mazei-Robison, Michelle S -- Chaudhury, Dipesh -- Juarez, Barbara -- LaPlant, Quincey -- Ferguson, Deveroux -- Feng, Jian -- Sun, Haosheng -- Scobie, Kimberly N -- Damez-Werno, Diane -- Crumiller, Marshall -- Ohnishi, Yoshinori N -- Ohnishi, Yoko H -- Mouzon, Ezekiell -- Dietz, David M -- Lobo, Mary Kay -- Neve, Rachael L -- Russo, Scott J -- Han, Ming-Hu -- Nestler, Eric J -- K99 MH094405/MH/NIMH NIH HHS/ -- P01 DA008227/DA/NIDA NIH HHS/ -- R01 DA014133/DA/NIDA NIH HHS/ -- R01 MH092306/MH/NIMH NIH HHS/ -- T32 MH087004/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2012 Oct 5;338(6103):124-8. doi: 10.1126/science.1222265.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Fishberg Department of Neuroscience and Friedman Brain Institute, Mount Sinai School of Medicine, New York, NY 10029, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23042896" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain-Derived Neurotrophic Factor/genetics/*physiology ; Dopamine/metabolism ; Dopaminergic Neurons/*drug effects/physiology ; Gene Expression Regulation ; Gene Knockdown Techniques ; Gene Knockout Techniques ; Male ; Mice ; Mice, Inbred C57BL ; Morphine/*pharmacology ; Morphine Dependence/genetics/*physiopathology ; Nucleus Accumbens/drug effects/physiopathology ; Photic Stimulation ; Receptor, trkB/genetics/physiology ; Ventral Tegmental Area/*drug effects/physiology
    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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  • 7
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    STC-SAB program users manual for the turbulent boundary layer and turbulent separation prediction methods employed in the NASA Langley streamtube curvature computer program (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The streamtube curvature program (STC) has been developed to predict the inviscid flow field and the pressure distribution about nacelles at transonic speeds. The effects of boundary layer are to displace the inviscid flow and effectively change the body shape. Thus, the body shape must be corrected by the displacement thickness in order to calculate the correct pressure distribution. This report describes the coupling of the Stratford and Beavers boundary layer solution with the inviscid STC analysis so that all nacelle pressure forces, friction drag, and incipient separation may be predicted. The usage of the coupled STC-SAB computer program is outlined and the program input and output are defined. Included in this manual are descriptions of the principal boundary layer tables and other revisions to the STC program. The use of the viscous option is controlled by the engineer during program input definition.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-112240
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  • 8
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    User manual for Streamtube Curvature Analysis: Analytical method for predicting the pressure distribution about a nacelle at transonic speeds, appendix (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The computer program listing of Streamtube Curvature Analysis is presented. The listing includes explanatory statements and titles so that the program flow is readily discernable. The computer program listing is in CDC FORTRAN 2.3 source language form, except for three subroutines, GETIX, GETRLX, and SAVIX, which are in COMPOSE 1.1 language.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-112239-3
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  • 9
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    Users manual for Streamtube Curvature Analysis: Analytical method for predicting the pressure distribution about a nacelle at transonic speeds, volume 2 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A special version of the Streamtube Curvature Analysis (STC) was been constructed to include a detached bow shock upstream of a plane or axisymmetric inlet. The bow wave is modeled using the method of Moeckel in conjunction with an approximate definition of the shock stand-off distance. A description of the Moeckel method and its implementation in the STC program are given.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-112239-2
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  • 10
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    Users manual for Streamtube Curvature Analysis: Analytical method for predicting the pressure distribution about a nacelle at transonic speeds, volume 1 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The computer program, Streamtube Curvature Analysis, is described for the engineering user and for the programmer. The user oriented documentation includes a description of the mathematical governing equations, their use in the solution, and the method of solution. The general logical flow of the program is outlined and detailed instructions for program usage and operation are explained. General procedures for program use and the program capabilities and limitations are described. From the standpoint of the grammar, the overlay structure of the program is described. The various storage tables are defined and their uses explained. The input and output are discussed in detail. The program listing includes numerous comments so that the logical flow within the program is easily followed. A test case showing input data and output format is included as well as an error printout description.
    Keywords: FLUID MECHANICS
    Type: NASA-CR-112239-1
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