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  • Geophysics  (137)
  • Female  (39)
  • Instrumentation and Photography  (38)
  • Molecular Sequence Data  (35)
  • 2000-2004  (245)
  • 2000  (245)
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  • 2000-2004  (245)
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  • 1
    Publication Date: 2000-03-10
    Description: The 2,272,351-base pair genome of Neisseria meningitidis strain MC58 (serogroup B), a causative agent of meningitis and septicemia, contains 2158 predicted coding regions, 1158 (53.7%) of which were assigned a biological role. Three major islands of horizontal DNA transfer were identified; two of these contain genes encoding proteins involved in pathogenicity, and the third island contains coding sequences only for hypothetical proteins. Insights into the commensal and virulence behavior of N. meningitidis can be gleaned from the genome, in which sequences for structural proteins of the pilus are clustered and several coding regions unique to serogroup B capsular polysaccharide synthesis can be identified. Finally, N. meningitidis contains more genes that undergo phase variation than any pathogen studied to date, a mechanism that controls their expression and contributes to the evasion of the host immune system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tettelin, H -- Saunders, N J -- Heidelberg, J -- Jeffries, A C -- Nelson, K E -- Eisen, J A -- Ketchum, K A -- Hood, D W -- Peden, J F -- Dodson, R J -- Nelson, W C -- Gwinn, M L -- DeBoy, R -- Peterson, J D -- Hickey, E K -- Haft, D H -- Salzberg, S L -- White, O -- Fleischmann, R D -- Dougherty, B A -- Mason, T -- Ciecko, A -- Parksey, D S -- Blair, E -- Cittone, H -- Clark, E B -- Cotton, M D -- Utterback, T R -- Khouri, H -- Qin, H -- Vamathevan, J -- Gill, J -- Scarlato, V -- Masignani, V -- Pizza, M -- Grandi, G -- Sun, L -- Smith, H O -- Fraser, C M -- Moxon, E R -- Rappuoli, R -- Venter, J C -- New York, N.Y. -- Science. 2000 Mar 10;287(5459):1809-15.〈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/10710307" target="_blank"〉PubMed〈/a〉
    Keywords: Antigenic Variation ; Antigens, Bacterial/immunology ; Bacteremia/microbiology ; Bacterial Capsules/genetics ; Bacterial Proteins/genetics/physiology ; DNA Transposable Elements ; Evolution, Molecular ; Fimbriae, Bacterial/genetics ; *Genome, Bacterial ; Humans ; Meningitis, Meningococcal/microbiology ; Meningococcal Infections/microbiology ; Molecular Sequence Data ; Mutation ; Neisseria meningitidis/classification/*genetics/*pathogenicity/physiology ; Open Reading Frames ; Operon ; Phylogeny ; Recombination, Genetic ; *Sequence Analysis, DNA ; Serotyping ; Transformation, Bacterial ; Virulence/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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  • 2
    Publication Date: 2000-01-05
    Description: The hCHK2 gene encodes the human homolog of the yeast Cds1 and Rad53 G2 checkpoint kinases, whose activation in response to DNA damage prevents cellular entry into mitosis. Here, it is shown that heterozygous germ line mutations in hCHK2 occur in Li-Fraumeni syndrome, a highly penetrant familial cancer phenotype usually associated with inherited mutations in the TP53 gene. These observations suggest that hCHK2 is a tumor suppressor gene conferring predisposition to sarcoma, breast cancer, and brain tumors, and they also provide a link between the central role of p53 inactivation in human cancer and the well-defined G2 checkpoint in yeast.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bell, D W -- Varley, J M -- Szydlo, T E -- Kang, D H -- Wahrer, D C -- Shannon, K E -- Lubratovich, M -- Verselis, S J -- Isselbacher, K J -- Fraumeni, J F -- Birch, J M -- Li, F P -- Garber, J E -- Haber, D A -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2528-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Center for Cancer Risk Analysis and Harvard Medical School, Building 149, Charlestown, MA 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617473" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Apoptosis ; Brain Neoplasms/genetics ; Breast Neoplasms/genetics ; Checkpoint Kinase 2 ; Female ; G1 Phase ; *G2 Phase ; *Genes, Tumor Suppressor ; Genes, p53 ; Genetic Predisposition to Disease ; *Germ-Line Mutation ; Heterozygote ; Humans ; Li-Fraumeni Syndrome/enzymology/*genetics/pathology ; Male ; Pedigree ; Polymorphism, Genetic ; Protein Kinases/genetics ; Protein-Serine-Threonine Kinases/*genetics/metabolism ; Sarcoma/genetics ; Signal Transduction ; Tumor Cells, Cultured
    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
    Publication Date: 2000-03-24
    Description: We report on the quality of a whole-genome assembly of Drosophila melanogaster and the nature of the computer algorithms that accomplished it. Three independent external data sources essentially agree with and support the assembly's sequence and ordering of contigs across the euchromatic portion of the genome. In addition, there are isolated contigs that we believe represent nonrepetitive pockets within the heterochromatin of the centromeres. Comparison with a previously sequenced 2.9- megabase region indicates that sequencing accuracy within nonrepetitive segments is greater than 99. 99% without manual curation. As such, this initial reconstruction of the Drosophila sequence should be of substantial value to the scientific community.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Myers, E W -- Sutton, G G -- Delcher, A L -- Dew, I M -- Fasulo, D P -- Flanigan, M J -- Kravitz, S A -- Mobarry, C M -- Reinert, K H -- Remington, K A -- Anson, E L -- Bolanos, R A -- Chou, H H -- Jordan, C M -- Halpern, A L -- Lonardi, S -- Beasley, E M -- Brandon, R C -- Chen, L -- Dunn, P J -- Lai, Z -- Liang, Y -- Nusskern, D R -- Zhan, M -- Zhang, Q -- Zheng, X -- Rubin, G M -- Adams, M D -- Venter, J C -- New York, N.Y. -- Science. 2000 Mar 24;287(5461):2196-204.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Celera Genomics, Inc., 45 West Gude Drive, Rockville, MD 20850, USA. Gene.Myers@celera.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10731133" target="_blank"〉PubMed〈/a〉
    Keywords: Algorithms ; Animals ; Chromatin/genetics ; *Computational Biology ; Contig Mapping ; Drosophila melanogaster/*genetics ; Euchromatin ; Genes, Insect ; *Genome ; Heterochromatin/genetics ; Molecular Sequence Data ; Physical Chromosome Mapping ; Repetitive Sequences, Nucleic Acid ; *Sequence Analysis, DNA ; Sequence Tagged Sites
    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
    Publication Date: 2000-10-29
    Description: Lentiviral delivery of glial cell line-derived neurotrophic factor (lenti-GDNF) was tested for its trophic effects upon degenerating nigrostriatal neurons in nonhuman primate models of Parkinson's disease (PD). We injected lenti-GDNF into the striatum and substantia nigra of nonlesioned aged rhesus monkeys or young adult rhesus monkeys treated 1 week prior with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Extensive GDNF expression with anterograde and retrograde transport was seen in all animals. In aged monkeys, lenti-GDNF augmented dopaminergic function. In MPTP-treated monkeys, lenti-GDNF reversed functional deficits and completely prevented nigrostriatal degeneration. Additionally, lenti-GDNF injections to intact rhesus monkeys revealed long-term gene expression (8 months). In MPTP-treated monkeys, lenti-GDNF treatment reversed motor deficits in a hand-reach task. These data indicate that GDNF delivery using a lentiviral vector system can prevent nigrostriatal degeneration and induce regeneration in primate models of PD and might be a viable therapeutic strategy for PD patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kordower, J H -- Emborg, M E -- Bloch, J -- Ma, S Y -- Chu, Y -- Leventhal, L -- McBride, J -- Chen, E Y -- Palfi, S -- Roitberg, B Z -- Brown, W D -- Holden, J E -- Pyzalski, R -- Taylor, M D -- Carvey, P -- Ling, Z -- Trono, D -- Hantraye, P -- Deglon, N -- Aebischer, P -- NS40578/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):767-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurological Sciences, Rush Presbyterian-St. Luke's Medical Center, Chicago, IL 60612, USA. jkordowe@rush.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052933" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine ; Aging ; Animals ; Antigens, CD/analysis ; Dihydroxyphenylalanine/*analogs & derivatives/metabolism ; Disease Models, Animal ; Dopamine/*metabolism ; Female ; Gene Expression ; *Genetic Therapy ; Genetic Vectors ; Glial Cell Line-Derived Neurotrophic Factor ; Lentivirus/genetics ; Macaca mulatta ; Neostriatum/metabolism/pathology ; Nerve Degeneration/*prevention & control ; *Nerve Growth Factors ; Nerve Tissue Proteins/*genetics/metabolism/therapeutic use ; Neurons/enzymology ; Parkinson Disease/metabolism/pathology/physiopathology/*therapy ; Parkinsonian Disorders/metabolism/pathology/physiopathology/therapy ; Psychomotor Performance ; Substantia Nigra/metabolism/pathology ; Tyrosine 3-Monooxygenase/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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  • 5
    Publication Date: 2000-09-23
    Description: Insulin receptors (IRs) and insulin signaling proteins are widely distributed throughout the central nervous system (CNS). To study the physiological role of insulin signaling in the brain, we created mice with a neuron-specific disruption of the IR gene (NIRKO mice). Inactivation of the IR had no impact on brain development or neuronal survival. However, female NIRKO mice showed increased food intake, and both male and female mice developed diet-sensitive obesity with increases in body fat and plasma leptin levels, mild insulin resistance, elevated plasma insulin levels, and hypertriglyceridemia. NIRKO mice also exhibited impaired spermatogenesis and ovarian follicle maturation because of hypothalamic dysregulation of luteinizing hormone. Thus, IR signaling in the CNS plays an important role in regulation of energy disposal, fuel metabolism, and reproduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bruning, J C -- Gautam, D -- Burks, D J -- Gillette, J -- Schubert, M -- Orban, P C -- Klein, R -- Krone, W -- Muller-Wieland, D -- Kahn, C R -- DK31036/DK/NIDDK NIH HHS/ -- DK55326-01A2/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2000 Sep 22;289(5487):2122-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Klinik II und Poliklinik fur Innere Medizin and Center of Molecular Medicine (ZMMK) der Universitat zu Koln, Joseph Stelzmann Strasse 9, 50931 Cologne, Germany. jens.bruening@uni-koeln.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11000114" target="_blank"〉PubMed〈/a〉
    Keywords: Adipose Tissue ; Animals ; Blood Glucose/analysis ; *Body Weight ; Brain/*metabolism ; Eating ; Female ; Hypertriglyceridemia/etiology ; Insulin/blood/*physiology ; Insulin Resistance ; Leptin/blood ; Leuprolide/pharmacology ; Luteinizing Hormone/blood ; Male ; Mice ; Mice, Knockout ; Neurons/metabolism ; Obesity/etiology ; Ovarian Follicle/physiology ; Receptor, Insulin/genetics/*physiology ; *Reproduction ; Sex Characteristics ; Signal Transduction ; Spermatogenesis
    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
    Publication Date: 2004-12-03
    Description: Health effects from Martian dusts will be a concern for any manned Mars missions. Nuisance dusts plagued the Apollo astronauts, but dusts of more hazardous mineralogy, in habitats occupied by Mars astronauts weakened by a long-duration mission, may be more than a nuisance. Chemical hazards in Martian regolith attributable to S, Cl, Br, Cd, and Pb are known or strongly suspected to be present, but terrestrial studies of the health effects of dusts indicate that accurate determination of mineralogy is a critical factor in evaluating inhalation hazards. Mineral inhalation hazards such as the Group-I carcinogenic zeolite erionite, which is demonstrated to cause mesothelioma, cannot be identified by chemical analysis alone. Studies of palagonite analogs raise the possibility that erionite may occur on Mars. In addition to health effects concerns, environmental mineralogy has significant importance in resource extraction, groundwater use, and sustained agriculture. The high sulfur and chlorine content of Martian regolith will affect all of these uses, but the nature of mineralogic reservoirs for S and Cl will determine their uptake and concentration in extracted groundwater and in agricultural applications of regolith. Wet chemistry experiments planned for the Mars Environmental Compatibility Assessment (MECA) will define some of the consequences of water/soil interaction, but an understanding of the mineralogic basis for water-rock reactions is needed to understand the mechanisms of reaction and to apply the results of a few experiments to larger scales and different conditions.
    Keywords: Geophysics
    Type: Concepts and Approaches for Mars Exploration; Part 2; 300-301; LPI-Contrib-1062-Pt-2
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  • 7
    Publication Date: 2019-07-17
    Description: The NASA/GSFC Scanning Raman Lidar (SRL) was stationed on Andros Island in the Bahamas during August - September, 1998 as a part of the third Convection and Moisture Experiment (CAMEX-3) which focussed on hurricane development and tracking. During the period August 21 - 24, hurricane Bonnie passed near Andros Island and influenced the water vapor and cirrus cloud measurements acquired by the SRL. Two drying signatures related to the hurricane were recorded by the SRL and other sensors. Cirrus cloud optical depths (at 351 nm) were also measured during this period. Optical depth values ranged from approximately 0.01 to 1.4. The influence of multiple scattering on these optical depth measurements was studied with the conclusion that the measured values of optical depth are less than the actual value by up to 20%. The UV/lR cirrus cloud optical depth ratio was estimated based on a comparison of lidar and GOES measurements. Simple radiative transfer model calculations compared with GOES satellite brightness temperatures indicate that satellite radiances are significantly affected by the presence of cirrus clouds if IR optical depths are approximately 0.02 or greater. This has implications for satellite cirrus detection requirements.
    Keywords: Geophysics
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-07-15
    Description: Mutation at the mouse progressive ankylosis (ank) locus causes a generalized, progressive form of arthritis accompanied by mineral deposition, formation of bony outgrowths, and joint destruction. Here, we show that the ank locus encodes a multipass transmembrane protein (ANK) that is expressed in joints and other tissues and controls pyrophosphate levels in cultured cells. A highly conserved gene is present in humans and other vertebrates. These results identify ANK-mediated control of pyrophosphate levels as a possible mechanism regulating tissue calcification and susceptibility to arthritis in higher animals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ho, A M -- Johnson, M D -- Kingsley, D M -- 5T32GM07365/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 14;289(5477):265-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology and Howard Hughes Medical Institute, Beckman Center B300, Stanford University School of Medicine, Stanford, CA 94305-5327, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10894769" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arthritis/*genetics/metabolism/pathology ; Base Sequence ; Biological Transport ; COS Cells ; Calcinosis/*genetics ; Chromosome Mapping ; Cloning, Molecular ; Dna ; Diphosphates/*metabolism ; Durapatite/metabolism ; Gene Expression ; Genetic Complementation Test ; Humans ; Membrane Proteins/*genetics/metabolism/*physiology ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; Mutation ; Phenotype ; Phosphate Transport Proteins ; Physical Chromosome Mapping ; Sequence Homology, Nucleic Acid ; Tissue Distribution
    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
    Publication Date: 2000-02-26
    Description: Most types of antibiotic resistance impose a biological cost on bacterial fitness. These costs can be compensated, usually without loss of resistance, by second-site mutations during the evolution of the resistant bacteria in an experimental host or in a laboratory medium. Different fitness-compensating mutations were selected depending on whether the bacteria evolved through serial passage in mice or in a laboratory medium. This difference in mutation spectra was caused by either a growth condition-specific formation or selection of the compensated mutants. These results suggest that bacterial evolution to reduce the costs of antibiotic resistance can take different trajectories within and outside a host.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bjorkman, J -- Nagaev, I -- Berg, O G -- Hughes, D -- Andersson, D I -- New York, N.Y. -- Science. 2000 Feb 25;287(5457):1479-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, Swedish Institute for Infectious Disease Control, S-171 82 Solna, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10688795" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Animals ; Anti-Bacterial Agents/*pharmacology ; *Antiporters ; Carrier Proteins/genetics ; Culture Media ; Drug Resistance, Microbial/*genetics ; Escherichia coli Proteins ; Evolution, Molecular ; Female ; Fusidic Acid/pharmacology ; Membrane Proteins/genetics ; Mice ; Mice, Inbred BALB C ; *Mutation ; Peptide Elongation Factor G/genetics ; Ribosomal Proteins/genetics ; Salmonella typhimurium/*drug effects/*genetics/growth & development/metabolism ; Selection, Genetic ; Serial Passage ; Streptomycin/pharmacology ; Suppression, 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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  • 10
    Publication Date: 2000-03-31
    Description: A major modification to the sterile insect technique is described, in which transgenic insects homozygous for a dominant, repressible, female-specific lethal gene system are used. We demonstrate two methods that give the required genetic characteristics in an otherwise wild-type genetic background. The first system uses a sex-specific promoter or enhancer to drive the expression of a repressible transcription factor, which in turn controls the expression of a toxic gene product. The second system uses non-sex-specific expression of the repressible transcription factor to regulate a selectively lethal gene product. Both methods work efficiently in Drosophila melanogaster, and we expect these principles to be widely applicable to more economically important organisms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thomas, D D -- Donnelly, C A -- Wood, R J -- Alphey, L S -- New York, N.Y. -- Science. 2000 Mar 31;287(5462):2474-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, Wellcome Trust Centre for the Epidemiology of Infectious Disease, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10741964" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Crosses, Genetic ; DNA-Binding Proteins ; *Drosophila Proteins ; Drosophila melanogaster/*genetics ; Egg Proteins/genetics ; Enhancer Elements, Genetic ; Fat Body/metabolism ; Female ; Gene Expression Regulation ; *Genes, Dominant ; *Genes, Insect ; *Genes, Lethal ; Genes, ras ; Homozygote ; Male ; Models, Biological ; Nuclear Proteins/genetics ; *Pest Control, Biological ; Promoter Regions, Genetic ; Tetracycline/pharmacology ; Trans-Activators/genetics ; Transcription Factors/genetics
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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