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  • 1
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    A gene-coexpression network for global discovery of conserved genetic modules (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-08-23
    Description: To elucidate gene function on a global scale, we identified pairs of genes that are coexpressed over 3182 DNA microarrays from humans, flies, worms, and yeast. We found 22,163 such coexpression relationships, each of which has been conserved across evolution. This conservation implies that the coexpression of these gene pairs confers a selective advantage and therefore that these genes are functionally related. Many of these relationships provide strong evidence for the involvement of new genes in core biological functions such as the cell cycle, secretion, and protein expression. We experimentally confirmed the predictions implied by some of these links and identified cell proliferation functions for several genes. By assembling these links into a gene-coexpression network, we found several components that were animal-specific as well as interrelationships between newly evolved and ancient modules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stuart, Joshua M -- Segal, Eran -- Koller, Daphne -- Kim, Stuart K -- New York, N.Y. -- Science. 2003 Oct 10;302(5643):249-55. Epub 2003 Aug 21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stanford Medical Informatics, 251 Campus Drive, Medical School Office Building X-215, Stanford, CA 94305-5329, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12934013" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Caenorhabditis elegans/genetics ; Cell Cycle/genetics ; Cell Division/genetics ; Computational Biology ; Conserved Sequence ; Databases, Genetic ; Drosophila melanogaster/genetics ; *Gene Expression ; Gene Expression Profiling ; Gene Expression Regulation ; Genes, Fungal ; Genes, Helminth ; Genes, Insect ; Humans ; Models, Statistical ; Mutation ; *Oligonucleotide Array Sequence Analysis ; Proteins/metabolism ; Saccharomyces cerevisiae/genetics ; Signal Transduction/genetics ; Species Specificity ; Tumor Cells, Cultured
    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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    Reading the worm genome (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, S K -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):52-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology and Genetics, Stanford University Medical Center, Stanford, CA 94305-5329, USA. kim@cmgm.stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10644223" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Caenorhabditis elegans/*genetics/growth & development/*metabolism ; *Caenorhabditis elegans Proteins ; Female ; Genes, Helminth ; *Genome ; Helminth Proteins/genetics/*metabolism ; Protein Binding ; Repressor Proteins/genetics/metabolism ; Retinoblastoma Protein/metabolism ; Signal Transduction ; *Two-Hybrid System Techniques ; Vulva/growth & development ; Yeasts/genetics
    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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    A gene expression map for Caenorhabditis elegans (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-09-15
    Description: We have assembled data from Caenorhabditis elegans DNA microarray experiments involving many growth conditions, developmental stages, and varieties of mutants. Co-regulated genes were grouped together and visualized in a three-dimensional expression map that displays correlations of gene expression profiles as distances in two dimensions and gene density in the third dimension. The gene expression map can be used as a gene discovery tool to identify genes that are co-regulated with known sets of genes (such as heat shock, growth control genes, germ line genes, and so forth) or to uncover previously unknown genetic functions (such as genomic instability in males and sperm caused by specific transposons).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, S K -- Lund, J -- Kiraly, M -- Duke, K -- Jiang, M -- Stuart, J M -- Eizinger, A -- Wylie, B N -- Davidson, G S -- New York, N.Y. -- Science. 2001 Sep 14;293(5537):2087-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology and Genetics, Stanford University Medical School, Stanford, CA 94305, USA. kim@cmgm.stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11557892" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Animals ; Caenorhabditis elegans/*genetics/physiology ; *Computational Biology ; DNA Transposable Elements ; DNA, Complementary ; Databases, Factual ; Female ; *Gene Expression ; *Gene Expression Profiling ; Gene Expression Regulation ; *Genes, Helminth ; Genome ; *Genomics ; Helminth Proteins/biosynthesis/genetics ; Intestines/physiology ; Male ; Muscles/physiology ; Neurons/physiology ; Nucleic Acid Hybridization ; Oligonucleotide Array Sequence Analysis ; Oocytes/physiology ; RNA, Helminth/genetics ; Software ; Spermatozoa/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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  • 4
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    Observation of transition-state vibrational thresholds in the rate of dissociation of ketene (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-06-12
    Description: Rate constants for the dissociation of highly vibrationally excited ketene (CH(2)CO) have been measured at the threshold for the production of CH(2)((3)B(1)) and CO((1)Sigma(+)). The rate constant increases in a stepwise manner with increasing energy, consistent with the long-standing premise that the rate of a unimolecular reaction is controlled by flux through quantized transition-state thresholds. The data give the energies of the torsional and C-C-O bending vibrations of the transition state.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lovejoy, E R -- Kim, S K -- Moore, C B -- New York, N.Y. -- Science. 1992 Jun 12;256(5063):1541-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17836322" target="_blank"〉PubMed〈/a〉
    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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    Cell alignment required in differentiation of Myxococcus xanthus (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-24
    Description: During fruiting body morphogenesis of Myxococcus xanthus, cell movement is required for transmission of C-factor, a short range intercellular signaling protein necessary for sporulation and developmental gene expression. Nonmotile cells fail to sporulate and to express C-factor-dependent genes, but both defects were rescued by a simple manipulation of cell position that oriented the cells in aligned, parallel groups. A similar pattern of aligned cells normally results from coordinated recruitment of wildtype cells into multicellular aggregates, which later form mature fruiting bodies. It is proposed that directed cell movement establishes critical contacts between adjacent cells, which are required for efficient intercellular C-factor transmission.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, S K -- Kaiser, D -- AGO 2908/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1990 Aug 24;249(4971):926-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Stanford University School of Medicine, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2118274" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins ; Cell Differentiation ; Cell Division ; Cell Movement ; Kinetics ; Morphogenesis ; Myxococcales/*growth & development/physiology/ultrastructure ; Spores, Bacterial/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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  • 6
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    Prevention of programmed cell death in Caenorhabditis elegans by human bcl-2 (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-12-18
    Description: Programmed cell death is a physiological process that eliminates unwanted cells. The bcl-2 gene regulates programmed cell death in mammalian cells, but the way it functions is not known. Expression of the human bcl-2 gene in the nematode Caenorhabditis elegans reduced the number of programmed cell deaths, suggesting that the mechanism of programmed cell death controlled by bcl-2 in humans is the same as that in nematodes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vaux, D L -- Weissman, I L -- Kim, S K -- New York, N.Y. -- Science. 1992 Dec 18;258(5090):1955-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology, Stanford University Medical Center, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1470921" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Caenorhabditis elegans/cytology/embryology/*physiology ; Cell Death/*physiology ; Embryo, Nonmammalian/cytology/physiology ; GTP-Binding Proteins/genetics/*physiology ; Gene Expression ; Genotype ; Humans ; Proto-Oncogene Proteins/genetics/*physiology ; Proto-Oncogene Proteins c-bcl-2
    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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    Ablation of insulin-producing neurons in flies: growth and diabetic phenotypes (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-05-11
    Description: In the fruit fly Drosophila, four insulin genes are coexpressed in small clusters of cells [insulin-producing cells (IPCs)] in the brain. Here, we show that ablation of these IPCs causes developmental delay, growth retardation, and elevated carbohydrate levels in larval hemolymph. All of the defects were reversed by ectopic expression of a Drosophila insulin transgene. On the basis of these functional data and the observation that IPCs release insulin into the circulatory system, we conclude that brain IPCs are the main systemic supply of insulin during larval growth. We propose that IPCs and pancreatic islet beta cells are functionally analogous and may have evolved from a common ancestral insulin-producing neuron. Interestingly, the phenotype of flies lacking IPCs includes certain features of diabetes mellitus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rulifson, Eric J -- Kim, Seung K -- Nusse, Roel -- New York, N.Y. -- Science. 2002 May 10;296(5570):1118-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology, Beckman Center B300, Stanford University, Stanford, CA 94305-5329, USA. rulifson@cmgm.stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12004130" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Blood Glucose/*metabolism ; Brain/cytology ; Cell Count ; Cell Size ; Diabetes Mellitus ; Drosophila/anatomy & histology/genetics/growth & development/*physiology ; Drosophila Proteins/genetics/*metabolism ; Gene Expression ; Heart/innervation ; Hemolymph ; Insect Hormones/genetics/metabolism ; Insulin/genetics/*metabolism ; Larva/growth & development ; Myocardium/metabolism ; Neurons/*metabolism ; Neurosecretory Systems/cytology/metabolism ; Oligopeptides/genetics/metabolism ; Phenotype ; Pyrrolidonecarboxylic Acid/analogs & derivatives ; RNA, Messenger/genetics/metabolism ; Transgenes ; Trehalose/*blood ; Wings, Animal/anatomy & histology/cytology/growth & development
    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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  • 8
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    DNA sequences mediating class switching in alpha-immunoglobulins (1980)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1980-09-19
    Description: Immunoglobulin class switching involves specific DNA rearrangements of the gene segments coding for heavy chain constant regions (CH) during B lymphocyte differentiation. In two different cases of C mu to C alpha switching examined here (T15 and M603) and one taken from the literature (MC101), three different sites on the 5' side of C mu and three different sites on the 5' side of C alpha are joined together in the process of CH switching. The sequences surrounding the three germ-line C alpha sites of recombination are highly conserved blocks of 30 nucleotides that may serve as recognition sequences for CH switching to the C alpha gene. This putative recognition sequence is repeated 17 times in approximately 1400 nucleotides of the germ-line Calpha 5' flanking sequence. The lack of homology between this C alpha sequence and sequences reported for the C gamma 1 and C gamma 2b switch sites suggests that heavy chain switching is mediated by class-specific recognition sequences and, presumably, class-specific regulatory mechanisms. In addition, it appears that in one example (MC101) CH switching progressed from C mu to C alpha to C gamma 1. This switching pathway may present difficulties for the simple deletional model of CH switching.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, M M -- Kim, S K -- Hood, L E -- AI 09072/AI/NIAID NIH HHS/ -- GM 07616/GM/NIGMS NIH HHS/ -- PCM76-81546/PC/NCI NIH HHS/ -- New York, N.Y. -- Science. 1980 Sep 19;209(4463):1360-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6774415" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/*immunology ; Base Sequence ; DNA/genetics ; *Genes ; Immunoglobulin Constant Regions/*genetics ; Immunoglobulin Heavy Chains/*genetics ; Immunoglobulin Variable Region/genetics ; Immunoglobulin alpha-Chains/*genetics ; Immunoglobulin mu-Chains/*genetics ; Immunoglobulins/*genetics ; Mice ; Myeloma Proteins/genetics ; Recombination, Genetic
    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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  • 9
    Electronic Resource
    Electronic Resource
    Particle- and photoinduced conductivity in type-IIa diamonds (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1086-1095 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical characteristics associated with radiation detection were measured on single-crystal natural type-IIa diamond using two techniques: charged particle-induced conductivity and time-resolved transient photoinduced conductivity. The two techniques complement each other: The charged particle-induced conductivity technique measures the product of the carrier mobility μ and lifetime τ throughout the bulk of the material while the transient photoconductivity technique measures the carrier mobility and lifetime independently at the first few micrometers of the material surface. For each technique, the μτ product was determined by integration of the respective signals. The collection distance that a free carrier drifts in an electric field was extracted by each technique. As a result, a direct comparison of bulk and surface electrical properties was performed. The data from these two techniques are in agreement, indicating no difference in the electrical properties between the bulk and the surface of the material. The collection distance continues to increase with field up to 25 kV/cm without saturation. Using the transient photoconductivity technique the carrier mobility was measured separately and compared with a simple electron-phonon scattering model. The general characteristics of carrier mobility, lifetime, and collection distance at low electric field appear to be adequately described by the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354957
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  • 10
    Electronic Resource
    Electronic Resource
    Dependence of the magnetic properties of Co/Pd multilayered films on the structural parameters estimated accurately by x-ray diffraction (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4986-4988 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this study, Co/Pd multilayered films with a few atomic layers of Co were prepared by alternating deposition in an ultrahigh-vacuum physical-vapor-deposition system. The structural parameters were estimated accurately making use of only the angular positions of x-ray diffraction peaks. The magnetic properties were found to vary greatly depending on Pd predeposition and Pd-sublayer thicknesses as well as Co-sublayer thickness. The Pd-predeposited films were found to have a remarkably high coercivity of 4723 Oe and a greatly enhanced interfacial magnetic anisotropy of 0.72 mJ/m2, which indicates an excellent potential as a magneto-optical recording medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352021
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