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  • 1
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    Positioning of longitudinal nerves in C. elegans by nidogen (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-02-07
    Description: Basement membranes can help determine pathways of migrating axons. Although members of the nidogen (entactin) protein family are structural components of basement membranes, we find that nidogen is not required for basement membrane assembly in the nematode Caenorhabditis elegans. Nidogen is localized to body wall basement membranes and is required to direct longitudinal nerves dorsoventrally and to direct axons at the midlines. By examining migration of a single axon in vivo, we show that nidogen is required for the axon to switch from circumferential to longitudinal migration. Specialized basement membranes may thus regulate nerve position.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, S -- Wadsworth, W G -- New York, N.Y. -- Science. 2000 Apr 7;288(5463):150-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Robert Wood Johnson Medical School, Piscataway, NJ 08854-5635, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10753123" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; Animals, Genetically Modified ; Axons/*physiology ; Basement Membrane/*physiology ; Body Patterning ; Caenorhabditis elegans/anatomy & histology/embryology/genetics/*growth & ; development ; *Caenorhabditis elegans Proteins ; Cell Adhesion Molecules/genetics/physiology ; Cell Movement ; Cloning, Molecular ; Gene Expression ; Genes, Helminth ; In Situ Hybridization ; Intestines/cytology/metabolism ; Membrane Glycoproteins/analysis/chemistry/genetics/*physiology ; Motor Neurons/physiology/ultrastructure ; Muscles/metabolism ; Nervous System/anatomy & histology/embryology/growth & development/ultrastructure ; Neurons/metabolism ; Phenotype ; Protein Structure, Tertiary ; Receptors, Cell Surface/genetics/physiology ; 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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    HIFalpha targeted for VHL-mediated destruction by proline hydroxylation: implications for O2 sensing (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-09
    Description: HIF (hypoxia-inducible factor) is a transcription factor that plays a pivotal role in cellular adaptation to changes in oxygen availability. In the presence of oxygen, HIF is targeted for destruction by an E3 ubiquitin ligase containing the von Hippel-Lindau tumor suppressor protein (pVHL). We found that human pVHL binds to a short HIF-derived peptide when a conserved proline residue at the core of this peptide is hydroxylated. Because proline hydroxylation requires molecular oxygen and Fe(2+), this protein modification may play a key role in mammalian oxygen sensing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ivan, M -- Kondo, K -- Yang, H -- Kim, W -- Valiando, J -- Ohh, M -- Salic, A -- Asara, J M -- Lane, W S -- Kaelin , W G Jr -- New York, N.Y. -- Science. 2001 Apr 20;292(5516):464-8. Epub 2001 Apr 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dana-Farber Cancer Institute and Brigham and Women's Hospital, Howard Hughes Medical Institute, Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11292862" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Basic Helix-Loop-Helix Transcription Factors ; Cell Hypoxia ; Cell Line ; Cobalt/pharmacology ; Deferoxamine/pharmacology ; Humans ; Hydroxylation ; Hydroxyproline/*metabolism ; *Ligases ; Mass Spectrometry ; Mice ; Molecular Sequence Data ; Oxygen/*physiology ; Protein Structure, Tertiary ; Proteins/*metabolism ; Recombinant Fusion Proteins/metabolism ; Trans-Activators/chemistry/genetics/*metabolism ; Transcription Factors/*metabolism ; Tumor Cells, Cultured ; *Tumor Suppressor Proteins ; *Ubiquitin-Protein Ligases ; Ubiquitins/metabolism ; Von Hippel-Lindau Tumor Suppressor Protein
    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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    The rise of the rhizosolenid diatoms (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-04-24
    Description: The 18S ribosomal DNA molecular phylogeny and lipid composition of over 120 marine diatoms showed that the capability to biosynthesize highly branched isoprenoid (HBI) alkenes is restricted to two specific phylogenetic clusters, which independently evolved in centric and pennate diatoms. The molecular record of C25 HBI chemical fossils in a large suite of well-dated marine sediments and petroleum revealed that the older cluster, composed of rhizosolenid diatoms, evolved 91.5 +/- 1.5 million years ago (Upper Turonian), enabling an accurate dating of the pace of diatom evolution that is unprecedented. The rapid rise of the rhizosolenid diatoms probably resulted from a major reorganization of the nutrient budget in the mid-Cretaceous oceans, triggered by plate tectonics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Damste, Jaap S Sinninghe -- Muyzer, Gerard -- Abbas, Ben -- Rampen, Sebastiaan W -- Masse, Guillaume -- Allard, W Guy -- Belt, Simon T -- Robert, Jean-Michel -- Rowland, Steven J -- Moldowan, J Michael -- Barbanti, Silvana M -- Fago, Frederick J -- Denisevich, Peter -- Dahl, Jeremy -- Trindade, Luiz A F -- Schouten, Stefan -- New York, N.Y. -- Science. 2004 Apr 23;304(5670):584-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Marine Biogeochemistry and Toxicology, Royal Netherlands Institute for Sea Research, Post Office Box 59, 1790 AB Den Burg, Texel, Netherlands. damste@nioz.nl〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15105500" target="_blank"〉PubMed〈/a〉
    Keywords: Alkenes/*analysis/metabolism ; *Biological Evolution ; DNA, Ribosomal/genetics ; *Diatoms/classification/genetics/metabolism ; Fossils ; *Geologic Sediments ; Lipids/biosynthesis ; Molecular Sequence Data ; Petroleum ; Phylogeny ; RNA, Ribosomal, 18S/genetics ; Terpenes/*analysis/metabolism
    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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    Structure of an HIF-1alpha -pVHL complex: hydroxyproline recognition in signaling (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-05-11
    Description: The ubiquitination of the hypoxia-inducible factor (HIF) by the von Hippel-Lindau tumor suppressor (pVHL) plays a central role in the cellular response to changes in oxygen availability. pVHL binds to HIF only when a conserved proline in HIF is hydroxylated, a modification that is oxygen-dependent. The 1.85 angstrom structure of a 20-residue HIF-1alpha peptide-pVHL-ElonginB-ElonginC complex shows that HIF-1alpha binds to pVHL in an extended beta strand-like conformation. The hydroxyproline inserts into a gap in the pVHL hydrophobic core, at a site that is a hotspot for tumorigenic mutations, with its 4-hydroxyl group recognized by buried serine and histidine residues. Although the beta sheet-like interactions contribute to the stability of the complex, the hydroxyproline contacts are central to the strict specificity characteristic of signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Min, Jung-Hyun -- Yang, Haifeng -- Ivan, Mircea -- Gertler, Frank -- Kaelin, William G Jr -- Pavletich, Nikola P -- New York, N.Y. -- Science. 2002 Jun 7;296(5574):1886-9. Epub 2002 May 9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cellular Biochemistry and Biophysics Program and Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12004076" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Crystallography, X-Ray ; Humans ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Hydroxylation ; Hydroxyproline/*metabolism ; Hypoxia-Inducible Factor 1, alpha Subunit ; Ligases/*chemistry/genetics/metabolism ; Macromolecular Substances ; Mice ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Protein Conformation ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Signal Transduction ; Transcription Factors/*chemistry/metabolism ; *Tumor Suppressor Proteins ; *Ubiquitin-Protein Ligases ; Von Hippel-Lindau Tumor Suppressor Protein
    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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    Rapid evolution of a geographic cline in size in an introduced fly (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-15
    Description: The introduction and rapid spread of Drosophila subobscura in the New World two decades ago provide an opportunity to determine the predictability and rate of evolution of a geographic cline. In ancestral Old World populations, wing length increases clinally with latitude. In North American populations, no wing length cline was detected one decade after the introduction. After two decades, however, a cline has evolved and largely converged on the ancestral cline. The rate of morphological evolution on a continental scale is very fast, relative even to rates measured within local populations. Nevertheless, different wing sections dominate the New versus Old World clines. Thus, the evolution of geographic variation in wing length has been predictable, but the means by which the cline is achieved is contingent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huey, R B -- Gilchrist, G W -- Carlson, M L -- Berrigan, D -- Serra, L -- New York, N.Y. -- Science. 2000 Jan 14;287(5451):308-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Washington, Box 351800, Seattle, WA 98195-1800, USA. hueyrb@u.washington.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10634786" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Drosophila/*anatomy & histology/*genetics ; Europe ; Female ; Geography ; Male ; North America ; Sex Characteristics ; Time Factors ; Wings, Animal/*anatomy & histology
    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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    Evolutionary exploitation of design options by the first animals with hard skeletons (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-05-20
    Description: The set of viable design elements available for animals to use in building skeletons has been fully exploited. Analysis of animal skeletons in relation to the multivariate, theoretical "Skeleton Space" has shown that a large proportion of these options are used in each phylum. Here, we show that structural elements deployed in the skeletons of Burgess Shale animals (Middle Cambrian) incorporate 146 of 182 character pairs defined in this morphospace. Within 15 million years of the appearance of crown groups of phyla with substantial hard parts, at least 80 percent of skeletal design elements recognized among living and extinct marine metazoans were exploited.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thomas, R D -- Shearman, R M -- Stewart, G W -- New York, N.Y. -- Science. 2000 May 19;288(5469):1239-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geosciences, Franklin & Marshall College, Lancaster, PA 17604, USA. r_thomas@acad.fandm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10817998" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arthropods/anatomy & histology ; *Biological Evolution ; Cnidaria/anatomy & histology ; *Fossils ; Mollusca/anatomy & histology ; *Morphogenesis ; Oceans and Seas ; Porifera/anatomy & histology ; *Skeleton
    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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