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  • LUNAR AND PLANETARY EXPLORATION  (132)
  • Humans  (92)
  • 2010-2014
  • 1990-1994  (224)
  • 1980-1984
  • 1990  (224)
  • 1
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    (Ar-39)-(Ar-40) dating of mesosiderites - Evidence for major parent body disruption less than 4 Ga ago (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The (Ar-39) (Ar-40) chronologies were determined for 14 different mesosiderites representing the full range of classification according to recrystallization, and these chronologies were compared with analogous data for other meteorite types and for lunar highland rocks. Results of Ar-Ar chronologies indicate the history of a degassing of Ar due to a major thermal event that occurred less than 3.9 Ga ago; this event is not the metal-silicate mixing event, which is known to have occurred earlier than 4.4 Ga ago. It is suggested that a major collisional disruption-reassembly event less than 3.9 Ga ago took place, leaving the metal-silicate breccias buried under tens of kilometers of rubble, where they cooled slowly through the Ar closure temperatures.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 54; 2549-256
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Smaller solar system bodies and orbits; Proceedings of Symposium 3, Workshops II, III, and XXVI, and Topical Meetings of the 27th COSPAR Plenary Meeting, Espoo, Finland, July 18-29, 1988 (1990)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: Topics discussed in this volume include the reappraisal of the moon and Mars/Phobos/Deimos; the origin and evolution of planetary and satellite systems; asteroids, comets, and dust (a post-IRAS perspective); satellite dynamics; future planetary missions; and orbital debris. Papers are presented on a comparison of the chemistry of moon and Mars, the use of a mobile surface radar to study the atmosphere and ionosphere, and laser-ionization studies with the technical models of the LIMA-D/Phobos. Attention is given to planetogonic scenarios and the evolution of relatively mass-rich preplanetary disks, the kinetic behavior of planetesimals revolving around the sun, the planetary evolution of Mars, and pre- and post-IRAS asteroid taxonomies. Consideration is also given to ocean tides and tectonic plate motions in high-precision orbit determination, the satellite altimeter calibration techniques, a theory of the motion of an artificial satellite in the earth atmosphere, ESA plans for planetary exploration, and the detection of earth orbiting objects by IRAS.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: (ISSN 0273-1177)
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Low-frequency radio emissions at Neptune (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Voyager 2 plasma wave receiver detected weak radio emissions from Neptune's magnetosphere in the frequency range of 3 - 60 kHz. The emissions occurred in bursts lasting for typically 1.5 hours, often occurring twice per planetary rotation. Most of these radio bursts were detected within several degrees of the magnetic equatorial plane. During the passage through the magnetosphere, electrostatic upper hybrid resonance bands were observed close to the magnetic equator in conjunction with intensifications of the radio emissions at frequencies close to and above the upper hybrid bands. Further, near closest approach, the radio emissions were observed to cross the right-hand cutoff frequency with no apparent attenuation. It is concluded that the Neptunian radio emissions below about 60 kHz are produced by mode conversion from the upper hybrid waves and propagate in the ordinary mode into beams within about 12 deg of the magnetic equator. There is also evidence of an extraordinary mode emission at about 60 kHz which is apparently generated by an entirely different source from the escaping continuum radiation.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 17; 1649-165
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Electrostatic electron and ion cyclotron harmonic waves in Neptune's magnetosphere (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Voyager 2 observations of electrostatic electron and ion cyclotron waves detected in Neptune's magnetosphere are presented. Both types of emission appear in a frequency band above the electron and ion (proton) cyclotron frequencies, respectively, and are tightly confined to the magnetic equator occurring within a few degrees of it. The electron cyclotron modes including an intense upper hybrid resonance emission excited by an unstable loss cone distribution of low-density superthermal electrons. The ion cyclotron waves are interpreted as hydrogen Bernstein modes including an intense lower hybrid resonance emission excited by an unstable ring distribution of low-density pickup N(+) ions deriving from the satellite Triton.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 17; 1657-166
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Isotope-edited NMR of cyclosporin A bound to cyclophilin: evidence for a trans 9,10 amide bond (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-07
    Description: The binding of a 13C-labeled cyclosporin A (CsA) analog to cyclophilin (peptidyl prolyl isomerase) was examined by means of isotope-edited nuclear magnetic resonance (NMR) techniques. A trans 9,10 peptide bond was adopted when CsA was bound to cyclophilin, in contrast to the cis 9,10 peptide bond found in the crystalline and solution conformations of CsA. Furthermore, nuclear Overhauser effects (NOEs) were observed between the zeta 3 and epsilon 3 protons of the methylleucine (MeLeu) residue at position 9 of CsA and tryptophan121 (Trp121) and phenylalanine (Phe) protons of cyclophilin, suggesting that the MeLeu9 residue of CsA interacts with cyclophilin. These results illustrate the power of isotope-edited NMR techniques for rapidly providing useful information about the conformations and active site environment of inhibitors bound to their target enzymes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fesik, S W -- Gampe, R T Jr -- Holzman, T F -- Egan, D A -- Edalji, R -- Luly, J R -- Simmer, R -- Helfrich, R -- Kishore, V -- Rich, D H -- New York, N.Y. -- Science. 1990 Dec 7;250(4986):1406-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Pharmaceutical Discovery Division, Abbott Laboratories, Abbott Park, IL 60064.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2255910" target="_blank"〉PubMed〈/a〉
    Keywords: Amides ; Amino Acid Isomerases/chemistry/*metabolism ; Carbon Isotopes ; Carrier Proteins/chemistry/*metabolism ; Cyclosporins/chemistry/*metabolism ; Escherichia coli/genetics ; Humans ; Leucine/analogs & derivatives/chemistry ; Magnetic Resonance Spectroscopy/methods ; Peptidylprolyl Isomerase ; Phenylalanine/chemistry ; Protein Binding ; Protein Conformation ; Recombinant Proteins/chemistry/metabolism ; Tryptophan/chemistry
    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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  • 6
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    RAG-1 and RAG-2, adjacent genes that synergistically activate V(D)J recombination (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-22
    Description: The vast repertoire of immunoglobulins and T cell receptors is generated, in part, by V(D)J recombination, a series of genomic rearrangements that occur specifically in developing lymphocytes. The recombination activating gene, RAG-1, which is a gene expressed exclusively in maturing lymphoid cells, was previously isolated. RAG-1 inefficiently induced V(D)J recombinase activity when transfected into fibroblasts, but cotransfection with an adjacent gene, RAG-2, has resulted in at least a 1000-fold increase in the frequency of recombination. The 2.1-kilobase RAG-2 complementary DNA encodes a putative protein of 527 amino acids whose sequence is unrelated to that of RAG-1. Like RAG-1, RAG-2 is conserved between species that carry out V(D)J recombination, and its expression pattern correlates precisely with that of V(D)J recombinase activity. In addition to being located just 8 kilobases apart, these convergently transcribed genes are unusual in that most, if not all, of their coding and 3' untranslated sequences are contained in single exons. RAG-1 and RAG-2 might activate the expression of the V(D)J recombinase but, more likely, they directly participate in the recombination reaction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oettinger, M A -- Schatz, D G -- Gorka, C -- Baltimore, D -- GM39458/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 22;248(4962):1517-23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Cambridge, MA 02142.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2360047" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Biological Evolution ; Cattle ; Cell Line ; Chickens ; Cricetinae ; DNA/*genetics ; DNA Nucleotidyltransferases/*genetics ; *DNA-Binding Proteins ; Dogs ; Female ; *Gene Rearrangement, B-Lymphocyte ; *Gene Rearrangement, T-Lymphocyte ; *Homeodomain Proteins ; Humans ; Male ; Mice ; Molecular Sequence Data ; *Multigene Family ; Nuclear Proteins ; Nucleic Acid Hybridization ; Opossums ; Proteins/*genetics ; Rabbits ; Recombination, Genetic/*genetics ; Restriction Mapping ; Transfection ; Turtles ; VDJ Recombinases
    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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    Protease nexin-II (amyloid beta-protein precursor): a platelet alpha-granule protein (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-11
    Description: Protease nexin-II (PN-II) [amyloid beta-protein precursor (APP)] and the amyloid beta-protein are major constituents of neuritic plaques and cerebrovascular deposits in individuals with Alzheimer's disease and Down syndrome. Both the brain and the circulation have been implicated as sources of these molecules, although they have not been detected in blood. Human platelets have now been found to contain relatively large amounts of PN-II/APP. Platelet PN-II/APP was localized in platelet alpha-granules and was secreted upon platelet activation. Because PN-II/APP is a potent protease inhibitor and possesses growth factor activity, these results implicate PN-II/APP in wound repair. In certain disease states, alterations in platelet release and processing and clearance of PN-II/APP and its derived fragments could lead to pathological accumulation of these proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Van Nostrand, W E -- Schmaier, A H -- Farrow, J S -- Cunningham, D D -- GM-31609/GM/NIGMS NIH HHS/ -- HL01615/HL/NHLBI NIH HHS/ -- HL35553/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 May 11;248(4956):745-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Molecular Genetics, University of California, Irvine 92717.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2110384" target="_blank"〉PubMed〈/a〉
    Keywords: Amyloid/*blood/isolation & purification ; Amyloid beta-Peptides/*blood/isolation & purification ; Amyloid beta-Protein Precursor ; Antibodies, Monoclonal ; Blood Platelets/*chemistry ; Cell Fractionation ; Cytoplasmic Granules/*chemistry ; Epidermal Growth Factor/blood ; Humans ; Immunoblotting ; Plasminogen Inactivators/blood ; Platelet Activation ; Protein Precursors/*blood/isolation & purification
    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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    A new arbovirus from Aedes albopictus, an Asian mosquito established in the United States (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-21
    Description: Ten strains of a new arbovirus belonging to the Bunyamwera group (Bunyaviridae) were recovered from field-collected Aedes albopictus mosquitoes in Potosi, Missouri. This evidence indicates that this species may serve as an arbovirus vector in the United States. The urban-suburban distribution, aggressive biting behavior, and broad viral susceptibility of Ae. albopictus may lead to the transmission of viruses of known public health importance and perhaps of viruses hitherto not transmitted to humans because of the feeding pattern of their usual vectors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Francy, D B -- Karabatsos, N -- Wesson, D M -- Moore, C G Jr -- Lazuick, J S -- Niebylski, M L -- Tsai, T F -- Craig, G B Jr -- New York, N.Y. -- Science. 1990 Dec 21;250(4988):1738-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Vector-Borne Infectious Diseases, Centers for Disease Control, U.S. Public Health Service, Fort Collins, CO 80522.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2270489" target="_blank"〉PubMed〈/a〉
    Keywords: Aedes/*microbiology ; Animals ; Arboviruses/*isolation & purification ; Asia ; Humans ; Insect Vectors ; United States
    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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    High-resolution mapping of human chromosome 11 by in situ hybridization with cosmid clones (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-05
    Description: Cosmid clones containing human DNA inserts have been mapped on chromosome 11 by fluorescence in situ hybridization under conditions that suppress signal from repetitive DNA sequences. Thirteen known genes, one chromosome 11-specific DNA repeat, and 36 random clones were analyzed. High-resolution mapping was facilitated by using digital imaging microscopy and by analyzing extended (prometaphase) chromosomes. The map coordinates established by in situ hybridization showed a one to one correspondence with those determined by Southern (DNA) blot analysis of hybrid cell lines containing fragments of chromosome 11. Furthermore, by hybridizing three or more cosmids simultaneously, gene order on the chromosome could be established unequivocally. These results demonstrate the feasibility of rapidly producing high-resolution maps of human chromosomes by in situ hybridization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lichter, P -- Tang, C J -- Call, K -- Hermanson, G -- Evans, G A -- Housman, D -- Ward, D C -- GM-27882/GM/NIGMS NIH HHS/ -- GM-33868/GM/NIGMS NIH HHS/ -- HD-18012/HD/NICHD NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Jan 5;247(4938):64-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Human Genetics, Yale University School of Medicine, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2294592" target="_blank"〉PubMed〈/a〉
    Keywords: Blotting, Southern ; Cell Line ; *Chromosome Mapping ; *Chromosomes, Human, Pair 11 ; Cloning, Molecular ; Cosmids/*genetics ; DNA/*genetics ; DNA Probes ; Fluorescent Dyes ; Humans ; Hybrid Cells ; Microscopy, Fluorescence ; *Nucleic Acid Hybridization ; Repetitive Sequences, Nucleic Acid
    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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    An insertion in the human thyrotropin receptor critical for high affinity hormone binding (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-09-21
    Description: Thyrotropin (TSH), luteinizing hormone (LH), and chorionic gonadotropin (CG) are structurally related glycoprotein hormones, which bind to receptors that share a high degree of sequence similarity. However, comparison of the primary amino acid sequences of the TSH and LH-CG receptors reveals two unique insertions of 8 and 50 amino acids in the extracellular domain of the TSH receptor. The functional significance of these insertions were determined by site-directed mutagenesis. Deletion of the 50-amino acid tract (residues 317 to 366) had no effect on TSH binding or on TSH and thyroid-stimulating immunoglobulin (TSI) biological activities. In contrast, either deletion or substitution of the eight-amino acid region (residues 38 to 45) abolished these activities. This eight-amino acid tract near the amino terminus of the TSH receptor appears to be an important site of interaction for both TSH and TSI.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wadsworth, H L -- Chazenbalk, G D -- Nagayama, Y -- Russo, D -- Rapoport, B -- DK-19289/DK/NIDDK NIH HHS/ -- DK-36182/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Veterans Administration Medical Center, San Francisco, CA 94121.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2169649" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites ; Cell Line ; Chromosome Deletion ; Clone Cells ; Cyclic AMP/metabolism ; Humans ; Molecular Sequence Data ; Mutation ; Oligonucleotide Probes ; Receptors, Thyrotropin/*genetics/metabolism ; Thyrotropin/*metabolism/pharmacology ; Transfection
    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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