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  • 1
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    Asbestos and carcinogenicity (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonald, J C -- McDonald, A D -- New York, N.Y. -- Science. 1990 Aug 24;249(4971):844.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2168090" target="_blank"〉PubMed〈/a〉
    Keywords: Asbestos/*adverse effects ; Asbestos, Serpentine ; Cohort Studies ; Humans ; Mesothelioma/*etiology ; Mining ; Occupational Diseases/*etiology
    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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    Chrysotile, tremolite, and mesothelioma (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-02-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McDonald, J C -- McDonald, A D -- New York, N.Y. -- Science. 1995 Feb 10;267(5199):776-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7710525" target="_blank"〉PubMed〈/a〉
    Keywords: Asbestos, Amphibole/*adverse effects ; Asbestos, Serpentine/*adverse effects ; Cohort Studies ; Humans ; Lung Neoplasms/*etiology ; Male ; Mesothelioma/*etiology ; *Mining ; Occupational Diseases/*etiology ; Occupational Exposure ; Quebec ; Time Factors
    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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  • 3
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    A large impact crater beneath Hiawatha Glacier in northwest Greenland (2018)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2018
    Description: 〈p〉We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a kilometer of ice. This depression has an elevated rim that cross-cuts tributary subglacial channels and a subdued central uplift that appears to be actively eroding. From ground investigations of the deglaciated foreland, we identify overprinted structures within Precambrian bedrock along the ice margin that strike tangent to the subglacial rim. Glaciofluvial sediment from the largest river draining the crater contains shocked quartz and other impact-related grains. Geochemical analysis of this sediment indicates that the impactor was a fractionated iron asteroid, which must have been more than a kilometer wide to produce the identified crater. Radiostratigraphy of the ice in the crater shows that the Holocene ice is continuous and conformable, but all deeper and older ice appears to be debris rich or heavily disturbed. The age of this impact crater is presently unknown, but from our geological and geophysical evidence, we conclude that it is unlikely to predate the Pleistocene inception of the Greenland Ice Sheet.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Light-regulated collective contractility in a multicellular choanoflagellate (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    Description: 〈p〉Collective cell contractions that generate global tissue deformations are a signature feature of animal movement and morphogenesis. However, the origin of collective contractility in animals remains unclear. While surveying the Caribbean island of Curacao for choanoflagellates, the closest living relatives of animals, we isolated a previously undescribed species (here named 〈i〉Choanoeca flexa〈/i〉 sp. nov.) that forms multicellular cup-shaped colonies. The colonies rapidly invert their curvature in response to changing light levels, which they detect through a rhodopsin–cyclic guanosine monophosphate pathway. Inversion requires actomyosin-mediated apical contractility and allows alternation between feeding and swimming behavior. 〈i〉C. flexa〈/i〉 thus rapidly converts sensory inputs directly into multicellular contractions. These findings may inform reconstructions of hypothesized animal ancestors that existed before the evolution of specialized sensory and contractile cells.〈/p〉
    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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    A year in the life of a giant ground sloth during the Last Glacial Maximum in Belize (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉Stable isotope analysis of the first fossilized 〈i〉Eremotherium laurillardi〈/i〉 remains from Belize offers valuable insights into the conditions within which this individual lived and its ability to adapt to the increasing aridity of the Last Glacial Maximum (LGM). Cathodoluminescence (CL) microscopy was used to identify chemical alteration of the tooth during fossilization. Results demonstrate that the inner orthodentin resists diagenesis, yielding potentially unaltered values. Using an intensive "vacuum milling" technique, the inner orthodentin produced an accelerator mass spectrometry (AMS) date of 26,975 ± 120 calibrated years before the present. The stable carbon and oxygen isotope analysis of this layer shows that the tooth recorded two wet seasons separated by one longer dry season and that this sloth was able to adapt its diet to the marked seasonality of the LGM. This study offers new insights into obtaining reliable isotope data from fossilized remains and suggests that this individual adapted to climate shifts, contributing to the conversation surrounding megafauna extinction.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Increased vascularization in mice overexpressing angiopoietin-1 (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-17
    Description: The angiopoietins and members of the vascular endothelial growth factor (VEGF) family are the only growth factors thought to be largely specific for vascular endothelial cells. Targeted gene inactivation studies in mice have shown that VEGF is necessary for the early stages of vascular development and that angiopoietin-1 is required for the later stages of vascular remodeling. Here it is shown that transgenic overexpression of angiopoietin-1 in the skin of mice produces larger, more numerous, and more highly branched vessels. These results raise the possibility that angiopoietins can be used, alone or in combination with VEGF, to promote therapeutic angiogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Suri, C -- McClain, J -- Thurston, G -- McDonald, D M -- Zhou, H -- Oldmixon, E H -- Sato, T N -- Yancopoulos, G D -- HL-24136/HL/NHLBI NIH HHS/ -- HL-59157/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1998 Oct 16;282(5388):468-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Regeneron Pharmaceuticals, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9774272" target="_blank"〉PubMed〈/a〉
    Keywords: Angiopoietin-1 ; Animals ; Capillaries/anatomy & histology/ultrastructure ; Endothelial Growth Factors/genetics/physiology ; Endothelium, Vascular/ultrastructure ; Gene Expression ; Keratinocytes/metabolism ; Lymphokines/genetics/physiology ; Membrane Glycoproteins/genetics/*physiology ; Mice ; Mice, Transgenic ; *Neovascularization, Physiologic ; Skin/*blood supply/metabolism ; Transgenes ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors ; Venules/anatomy & histology/ultrastructure
    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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    Leakage-resistant blood vessels in mice transgenically overexpressing angiopoietin-1 (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-05
    Description: Angiopoietin-1 (Ang1) and vascular endothelial growth factor (VEGF) are endothelial cell-specific growth factors. Direct comparison of transgenic mice overexpressing these factors in the skin revealed that the VEGF-induced blood vessels were leaky, whereas those induced by Ang1 were nonleaky. Moreover, vessels in Ang1-overexpressing mice were resistant to leaks caused by inflammatory agents. Coexpression of Ang1 and VEGF had an additive effect on angiogenesis but resulted in leakage-resistant vessels typical of Ang1. Ang1 therefore may be useful for reducing microvascular leakage in diseases in which the leakage results from chronic inflammation or elevated VEGF and, in combination with VEGF, for promoting growth of nonleaky vessels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thurston, G -- Suri, C -- Smith, K -- McClain, J -- Sato, T N -- Yancopoulos, G D -- McDonald, D M -- HL-24136/HL/NHLBI NIH HHS/ -- HL-59157/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2511-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy and Cardiovascular Research Institute, University of California, San Francisco, CA 94143-0452, USA. gavint@itsa.ucsf.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617467" target="_blank"〉PubMed〈/a〉
    Keywords: Angiopoietin-1 ; Animals ; Arterioles/anatomy & histology/physiology ; Binding Sites ; Capillaries/anatomy & histology/physiology ; *Capillary Permeability ; Ear ; Endothelial Growth Factors/genetics/*physiology ; Endothelium, Vascular/metabolism ; Inflammation/chemically induced ; Inflammation Mediators/pharmacology ; Lymphokines/genetics/*physiology ; Membrane Glycoproteins/genetics/*physiology ; Mice ; Mice, Transgenic ; Microcirculation/anatomy & histology/*physiology ; Mustard Plant ; *Neovascularization, Physiologic ; Plant Extracts/pharmacology ; Plant Lectins ; Plant Oils ; Plants, Medicinal ; Platelet Activating Factor/pharmacology ; Ricin/metabolism ; Serotonin/pharmacology ; Skin/blood supply/metabolism ; Vascular Endothelial Growth Factor A ; Vascular Endothelial Growth Factors ; Venules/anatomy & histology/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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  • 8
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    Complete genome sequence of a virulent isolate of Streptococcus pneumoniae (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-07-21
    Description: The 2,160,837-base pair genome sequence of an isolate of Streptococcus pneumoniae, a Gram-positive pathogen that causes pneumonia, bacteremia, meningitis, and otitis media, contains 2236 predicted coding regions; of these, 1440 (64%) were assigned a biological role. Approximately 5% of the genome is composed of insertion sequences that may contribute to genome rearrangements through uptake of foreign DNA. Extracellular enzyme systems for the metabolism of polysaccharides and hexosamines provide a substantial source of carbon and nitrogen for S. pneumoniae and also damage host tissues and facilitate colonization. A motif identified within the signal peptide of proteins is potentially involved in targeting these proteins to the cell surface of low-guanine/cytosine (GC) Gram-positive species. Several surface-exposed proteins that may serve as potential vaccine candidates were identified. Comparative genome hybridization with DNA arrays revealed strain differences in S. pneumoniae that could contribute to differences in virulence and antigenicity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tettelin, H -- Nelson, K E -- Paulsen, I T -- Eisen, J A -- Read, T D -- Peterson, S -- Heidelberg, J -- DeBoy, R T -- Haft, D H -- Dodson, R J -- Durkin, A S -- Gwinn, M -- Kolonay, J F -- Nelson, W C -- Peterson, J D -- Umayam, L A -- White, O -- Salzberg, S L -- Lewis, M R -- Radune, D -- Holtzapple, E -- Khouri, H -- Wolf, A M -- Utterback, T R -- Hansen, C L -- McDonald, L A -- Feldblyum, T V -- Angiuoli, S -- Dickinson, T -- Hickey, E K -- Holt, I E -- Loftus, B J -- Yang, F -- Smith, H O -- Venter, J C -- Dougherty, B A -- Morrison, D A -- Hollingshead, S K -- Fraser, C M -- R01 AI40645-01A1/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2001 Jul 20;293(5529):498-506.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Institute for Genomic Research (TIGR), 9712 Medical Center Drive, Rockville, MD 20850, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11463916" target="_blank"〉PubMed〈/a〉
    Keywords: Antigens, Bacterial ; Bacterial Proteins/chemistry/genetics/immunology/metabolism ; Bacterial Vaccines ; Base Composition ; Carbohydrate Metabolism ; Carrier Proteins/genetics/metabolism ; Chromosomes, Bacterial/genetics ; Computational Biology ; DNA Transposable Elements ; DNA, Bacterial/chemistry/genetics ; Gene Duplication ; Genes, Bacterial ; *Genome, Bacterial ; Hexosamines/metabolism ; Oligonucleotide Array Sequence Analysis ; Recombination, Genetic ; Repetitive Sequences, Nucleic Acid ; *Sequence Analysis, DNA ; Species Specificity ; Streptococcus pneumoniae/*genetics/immunology/metabolism/*pathogenicity ; Virulence ; rRNA Operon
    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
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    Cytoprotective role of Ca2+- activated K+ channels in the cardiac inner mitochondrial membrane (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-11-02
    Description: Ion channels on the mitochondrial inner membrane influence cell function in specific ways that can be detrimental or beneficial to cell survival. At least one type of potassium (K+) channel, the mitochondrial adenosine triphosphate-sensitive K+ channel (mitoKATP), is an important effector of protection against necrotic and apoptotic cell injury after ischemia. Here another channel with properties similar to the surface membrane calcium-activated K+ channel was found on the mitochondrial inner membrane (mitoKCa) of guinea pig ventricular cells. MitoKCa significantly contributed to mitochondrial K+ uptake of the myocyte, and an opener of mitoKCa protected hearts against infarction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Wenhong -- Liu, Yongge -- Wang, Sheng -- McDonald, Todd -- Van Eyk, Jennifer E -- Sidor, Agnieszka -- O'Rourke, Brian -- NIHR01HL54598/HR/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2002 Nov 1;298(5595):1029-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular Cardiobiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12411707" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Animals ; Benzimidazoles/pharmacology ; Calcium/*metabolism ; Charybdotoxin/pharmacology ; *Cytoprotection ; Guinea Pigs ; Heart/physiology/physiopathology ; Hemodynamics ; Intracellular Membranes/*metabolism ; Ion Transport ; Large-Conductance Calcium-Activated Potassium Channels ; Mitochondria, Heart/*metabolism ; Myocardial Infarction/*prevention & control ; Myocardial Ischemia/pathology/physiopathology ; Myocytes, Cardiac/*physiology/ultrastructure ; Patch-Clamp Techniques ; Potassium/*metabolism ; Potassium Channels, Calcium-Activated/*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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  • 10
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    Regulation of receptor fate by ubiquitination of activated beta 2-adrenergic receptor and beta-arrestin (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-10-06
    Description: Although trafficking and degradation of several membrane proteins are regulated by ubiquitination catalyzed by E3 ubiquitin ligases, there has been little evidence connecting ubiquitination with regulation of mammalian G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptor (GPCR) function. Agonist stimulation of endogenous or transfected beta2-adrenergic receptors (beta2ARs) led to rapid ubiquitination of both the receptors and the receptor regulatory protein, beta-arrestin. Moreover, proteasome inhibitors reduced receptor internalization and degradation, thus implicating a role for the ubiquitination machinery in the trafficking of the beta2AR. Receptor ubiquitination required beta-arrestin, which bound to the E3 ubiquitin ligase Mdm2. Abrogation of beta-arrestin ubiquitination, either by expression in Mdm2-null cells or by dominant-negative forms of Mdm2 lacking E3 ligase activity, inhibited receptor internalization with marginal effects on receptor degradation. However, a beta2AR mutant lacking lysine residues, which was not ubiquitinated, was internalized normally but was degraded ineffectively. These findings delineate an adapter role of beta-arrestin in mediating the ubiquitination of the beta2AR and indicate that ubiquitination of the receptor and of beta-arrestin have distinct and obligatory roles in the trafficking and degradation of this prototypic GPCR.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shenoy, S K -- McDonald, P H -- Kohout, T A -- Lefkowitz, R J -- HL16037/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2001 Nov 9;294(5545):1307-13. Epub 2001 Oct 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Medicine, Duke University Medical Center, Box 3821, Durham, NC 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11588219" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arrestins/*metabolism ; COS Cells ; Catalysis ; Cell Line ; Cricetinae ; Cricetulus ; Cysteine Endopeptidases/metabolism ; Humans ; Isoproterenol/pharmacology ; Ligases/metabolism ; Multienzyme Complexes/antagonists & inhibitors/metabolism ; Mutation ; *Nuclear Proteins ; Phosphorylation ; Proteasome Endopeptidase Complex ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-mdm2 ; Receptors, Adrenergic, beta-2/genetics/*metabolism ; Recombinant Proteins/metabolism ; Transfection ; Ubiquitin/*metabolism ; 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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