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  • Articles  (714)
  • Biochemistry and Biotechnology  (432)
  • Engineering General  (155)
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  • 2020-2023
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  • 1995-1999  (531)
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  • Articles  (714)
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  • 1
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    Fas ligand: a sensor for DNA damage critical in skin cancer etiology (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-07
    Description: DNA-damaged cells can either repair the DNA or be eliminated through a homeostatic control mechanism termed "cellular proofreading." Elimination of DNA-damaged cells after ultraviolet radiation (UVR) through sunburn cell (apoptotic keratinocyte) formation is thought to be pivotal for the removal of precancerous skin cells. Sunburn cell formation was found to be dependent on Fas ligand (FasL), a pro-apoptotic protein induced by DNA damage. Chronic exposure to UVR caused 14 of 20 (70 percent) FasL-deficient mice and 1 of 20 (5 percent) wild-type mice to accumulate p53 mutations in the epidermis. Thus, FasL-mediated apoptosis is important for skin homeostasis, suggesting that the dysregulation of Fas-FasL interactions may be central to the development of skin cancer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hill, L L -- Ouhtit, A -- Loughlin, S M -- Kripke, M L -- Ananthaswamy, H N -- Owen-Schaub, L B -- CA45623/CA/NCI NIH HHS/ -- CA52457/CA/NCI NIH HHS/ -- F32 AI09351/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Aug 6;285(5429):898-900.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, University of Texas, M. D. Anderson Cancer Center, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10436160" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD95/genetics/physiology ; Apoptosis ; *DNA Damage ; Epidermis/*cytology/metabolism/radiation effects ; Fas Ligand Protein ; *Genes, p53 ; Keratinocytes/*cytology/metabolism/radiation effects ; Membrane Glycoproteins/genetics/*physiology ; Mice ; Mice, Inbred C3H ; Mutation ; Skin Neoplasms/*etiology/pathology ; Ultraviolet Rays ; Up-Regulation
    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
    Electronic Resource
    Electronic Resource
    Electronic computer solution for the MPN equation used in the determination of bacterial populations (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 1335-1335 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260180912
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  • 3
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    Positional cloning of the gene for multiple endocrine neoplasia-type 1 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-04-18
    Description: Multiple endocrine neoplasia-type 1 (MEN1) is an autosomal dominant familial cancer syndrome characterized by tumors in parathyroids, enteropancreatic endocrine tissues, and the anterior pituitary. DNA sequencing from a previously identified minimal interval on chromosome 11q13 identified several candidate genes, one of which contained 12 different frameshift, nonsense, missense, and in-frame deletion mutations in 14 probands from 15 families. The MEN1 gene contains 10 exons and encodes a ubiquitously expressed 2.8-kilobase transcript. The predicted 610-amino acid protein product, termed menin, exhibits no apparent similarities to any previously known proteins. The identification of MEN1 will enable improved understanding of the mechanism of endocrine tumorigenesis and should facilitate early diagnosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chandrasekharappa, S C -- Guru, S C -- Manickam, P -- Olufemi, S E -- Collins, F S -- Emmert-Buck, M R -- Debelenko, L V -- Zhuang, Z -- Lubensky, I A -- Liotta, L A -- Crabtree, J S -- Wang, Y -- Roe, B A -- Weisemann, J -- Boguski, M S -- Agarwal, S K -- Kester, M B -- Kim, Y S -- Heppner, C -- Dong, Q -- Spiegel, A M -- Burns, A L -- Marx, S J -- New York, N.Y. -- Science. 1997 Apr 18;276(5311):404-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Gene Transfer, National Human Genome Research Institute (NHGRI), National Institutes of Health (NIH), Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9103196" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Chromosome Mapping ; Chromosomes, Human, Pair 11 ; *Cloning, Molecular ; DNA, Complementary/genetics ; Exons ; Frameshift Mutation ; *Genes, Tumor Suppressor ; Humans ; Molecular Sequence Data ; Multiple Endocrine Neoplasia Type 1/*genetics ; Mutation ; Neoplasm Proteins/chemistry/*genetics ; *Proto-Oncogene Proteins
    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
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    Budding yeast Cdc20: a target of the spindle checkpoint (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-03-07
    Description: The spindle checkpoint regulates the cell division cycle by keeping cells with defective spindles from leaving mitosis. In the two-hybrid system, three proteins that are components of the checkpoint, Mad1, Mad2, and Mad3, were shown to interact with Cdc20, a protein required for exit from mitosis. Mad2 and Mad3 coprecipitated with Cdc20 at all stages of the cell cycle. The binding of Mad2 depended on Mad1 and that of Mad3 on Mad1 and Mad2. Overexpression of Cdc20 allowed cells with a depolymerized spindle or damaged DNA to leave mitosis but did not overcome the arrest caused by unreplicated DNA. Mutants in Cdc20 that were resistant to the spindle checkpoint no longer bound Mad proteins, suggesting that Cdc20 is the target of the spindle checkpoint.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, L H -- Lau, L F -- Smith, D L -- Mistrot, C A -- Hardwick, K G -- Hwang, E S -- Amon, A -- Murray, A W -- New York, N.Y. -- Science. 1998 Feb 13;279(5353):1041-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of California at San Francisco, San Francisco, CA 94143-0444, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9461437" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Anaphase ; Anaphase-Promoting Complex-Cyclosome ; Cadherins ; Calcium-Binding Proteins/metabolism ; *Carrier Proteins ; Cdc20 Proteins ; Cdh1 Proteins ; Cell Cycle Proteins/chemistry/genetics/*metabolism ; DNA Damage ; DNA Replication ; Fungal Proteins/chemistry/*metabolism ; Ligases/metabolism ; Mad2 Proteins ; *Mitosis ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/metabolism ; Phosphoproteins/metabolism ; *Repressor Proteins ; Saccharomyces cerevisiae/*cytology/*metabolism ; *Saccharomyces cerevisiae Proteins ; Spindle Apparatus/*metabolism ; *Ubiquitin-Protein Ligase Complexes ; Ubiquitin-Protein Ligases
    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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  • 5
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    Zeta phosphorylation without ZAP-70 activation induced by TCR antagonists or partial agonists (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-01-27
    Description: Small changes in the peptide-major histocompatibility complex (MHC) molecule ligands recognized by antigen-specific T cell receptors (TCRs) can convert fully activating complexes into partially activating or even inhibitory ones. This study examined early TCR-dependent signals induced by such partial agonists or antagonists. In contrast to typical agonist ligands, both an antagonist and several partial agonists stimulated a distinct pattern of zeta chain phosphorylation and failed to activate associated ZAP-70 kinase. These results identify a specific step in the early tyrosine phosphorylation cascade that is altered after TCR engagement with modified peptide-MHC molecule complexes. This finding may explain the different biological responses to TCR occupancy by these variant ligands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Madrenas, J -- Wange, R L -- Wang, J L -- Isakov, N -- Samelson, L E -- Germain, R N -- New York, N.Y. -- Science. 1995 Jan 27;267(5197):515-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lymphocyte Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7824949" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Clone Cells ; Cytochrome c Group/pharmacology ; Enzyme Activation ; Histocompatibility Antigens Class II/genetics/immunology/*pharmacology ; Interleukin-2/biosynthesis ; L Cells (Cell Line) ; Ligands ; Lymphocyte Activation ; Membrane Proteins/*metabolism ; Mice ; Molecular Sequence Data ; Mutation ; Peptide Fragments/pharmacology ; Phosphorylation ; Protein-Tyrosine Kinases/*metabolism ; Receptors, Antigen, T-Cell/agonists/antagonists & inhibitors/*metabolism ; Signal Transduction ; T-Lymphocytes, Helper-Inducer/*immunology ; Tyrosine/metabolism ; ZAP-70 Protein-Tyrosine Kinase
    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
    Electronic Resource
    Electronic Resource
    Isolation and partial characterization of conditional cell division cycle mutants inChlamydomonas (1995)
    Springer
    Protoplasma 186 (1995), S. 149-162 
    Details
    ISSN: 1615-6102
    Keywords: Algae ; Cytoskeleton ; Microtubules ; Microtubule organizing centres ; Mutation ; Temperature-sensitive
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have isolated a number of temperature conditional cell division cycle mutants of the unicellular plantChlamydomonas reinhardtii that are defective in single nuclear genes. Cells grow and divide normally at the permissive temperature (21 °C), but arrest in division at the restrictive temperature (33 °C). We have characterized these mutants using DNA probes and immunofluorescence techniques to localize cytoskeletal and microtubule organizing centre proteins. We describe here 3 broad classes of cell cycle mutation which result in cell cycle arrest with: unreplicated DNA (G1 arrest), duplicated DNA (G2 arrest) and multiple nuclei due to defective cytokinesis (cytokinesis arrest). The continuation of nuclear division in mutants blocked in cytokinesis provides support of an earlier hypothesis that stage specific events in theChlamydomonas cell cycle are arranged in separate dependent sequences. The mutants isolated in the present study provide insights into the role of cytoskeletal proteins in the coordination of plant cell division and the means to investigate the molecular mechanisms whereby division by multiple fission is controlled in the unicellular plantChlamydomonas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281325
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  • 7
    Electronic Resource
    Electronic Resource
    A finite element model for plasma simulation in multipoles (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 1449-1460 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A numerical model is proposed to simulate the space-time behaviour of a low-density plasma in a linear multipole. Semi-discrete Galerkin techniques are used in conjunction with triangular finite elements. For both space and time discretizations, special techniques are developed to numerically separate the effect of rapid diffusion along the field lines from the slow perpendicular diffusion. Numerical results are exhibited to show how these techniques succeed in eliminating the problems caused by the strong anisotropy of the diffusion coefficient in the strongly curved and very inhomogeneous multipole configuration.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620141003
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  • 8
    Electronic Resource
    Electronic Resource
    Smoothing techniques for certain primitive variable solutions of the Navier-Stokes equations (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 1785-1804 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Several types of smoothing technique are considered which generate continuous approximation (i.e. nodal values) for vorticity and pressure from finite element solutions of the Navier-Stokes equations using quadrilateral elements. The simpler schemes are based on combinations of linear extrapolation and/or averaging algorithms which convert elementwise. Gauss point values to nodal point values. More complicated schemes, based on a global smoothing technique which employ the mass matrix (consistent or lumped), are also presented.An initial assessment of the accuracy of the several schemes is obtained by comparing the approximate vorticities with an analytical function. Next, qualitative vorticity comparisons are made from numerical solutions of the steady-state driven cavity problem. Finally, applications of smoothing techniques to discontinuous pressure fields are demonstrated.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620141204
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  • 9
    Electronic Resource
    Electronic Resource
    A non-conforming element for stress analysis (1976)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 10 (1976), S. 1211-1219 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620100602
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  • 10
    Electronic Resource
    Electronic Resource
    A parametric cubic modelling system for general solids of composite materialThis work was supported by the Naval Air Development Center under Contract No. N62269-73-C-0736 and in part by the McDonnell Douglas Astronautics Company's Independent Research and Development Program. (1977)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 11 (1977), S. 653-670 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new approach to modelling solids that are anisotropic and heterogeneous is presented with applications to structures of composite material. A parametric cubic modelling system is presented for lines, surfaces, volumes, and physical data that uses construction-in-context to generate numerical data. This system automates the construction of discrete element models and can reduce input data requirements by more than an order of magnitude. A tricubic isoparametric discrete element is presented that does not require displacement derivatives to define connectivity. This element is capable of exact displacement and strain continuity over a surface while permitting strain discontinuities at heterogeneous material interfaces. The shape of an element can be any hexahedron, pentahedron, or tetrahedron and the material properties are allowed to vary over the volume. Evaluation of modelling error with respect to closed-form solutions for curved geometries indicate a single element can model up to 90-degree segments with stresses accurate to 1 per cent. Applications of the system to composite structures are presented for interlaminar edge effects and attachment stresses in a sandwich panel.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620110405
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