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  • ASTROPHYSICS  (185)
  • Animals  (92)
  • STRUCTURAL MECHANICS  (59)
  • CHEMISTRY
  • Physics
  • 1990-1994  (336)
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  • 1991  (336)
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  • 1990-1994  (336)
  • 1980-1984
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  • 1
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    An unusually strong Einstein ring in the radio source PKS1830 - 211 (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: High-resolution radio images of PKS1830 - 211 are obtained to study the possibility that the double structure is a gravitationally lensed object. The VLBI observations, taken from interferometric radiotelescope networks, reveal an elliptical ring that connects two bright spots of similar composition. Because the lens and the lensed object are closely aligned, and because of the structure of the two spots, the source is concluded to be a radio Einstein ring. The source is found to be close to the galactic plane, and the lens and the lensed object are extragalactic. The source is also found to be unusually bright, suggesting that it is aligned with a bright background source or amplified by some mechanism related to a source that is not so bright.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 352; 132-134
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Inability of malaria vaccine to induce antibodies to a protective epitope within its sequence (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-08
    Description: Saimiri monkeys immunized with a recombinant protein containing 20 copies of the nine amino acid repeat of the Plasmodium vivax circumsporozoite (CS) protein developed high concentrations of antibodies to the repeat sequence and to sporozoites, but were not protected against challenge. After intravenous injection of an immunoglobulin G3 monoclonal antibody (NVS3) against irradiated P. vivax sporozoites, four of six monkeys were protected against sporozoite-induced malaria, and the remaining two animals took significantly longer to become parasitemic. Epitope mapping demonstrated that NVS3 recognizes only four (AGDR) of the nine amino acids within the repeat region of the P. vivax CS protein. The monkeys immunized with (DRAADGQPAG)20 did not produce antibodies to the protective epitope AGDR. Thus, determination of the fine specificity of protective immune responses may be critical to the construction of successful subunit vaccines.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Charoenvit, Y -- Collins, W E -- Jones, T R -- Millet, P -- Yuan, L -- Campbell, G H -- Beaudoin, R L -- Broderson, J R -- Hoffman, S L -- New York, N.Y. -- Science. 1991 Feb 8;251(4994):668-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20889.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1704150" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/immunology ; Antibodies, Protozoan/*immunology ; Antigens, Protozoan/*immunology ; Epitopes ; Immunization, Passive ; Malaria/immunology/*prevention & control ; Molecular Sequence Data ; Peptide Fragments/immunology ; Plasmodium vivax/*immunology ; *Protozoan Proteins ; Saimiri ; Vaccines, Synthetic/immunology
    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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    Recombinant virus vaccine-induced SIV-specific CD8+ cytotoxic T lymphocytes (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-04-19
    Description: Evidence indicates that cytotoxic T lymphocytes (CTLs) may be important in containing the spread of the human immunodeficiency virus (HIV) in the infected host. Although the use of recombinant viruses has been proposed as an approach to elicit protective immunity against HIV, the ability of recombinant viral constructs to elicit CD8+ CTL responses in higher primates has never been demonstrated. A live recombinant virus, vaccinia-simian immunodeficiency virus of macaques (SIVmac), was used to determine whether such a genetically restricted, T lymphocyte-mediated antiviral response could be generated in a primate. Vaccinia-SIVmac vaccination elicited an SIVmac Gag-specific, CD8+ CTL response in rhesus monkeys. These CTLs recognized a peptide fragment that spans residues 171 to 195 of the Gag protein. The rhesus monkey major histocompatibility complex (MHC) class I gene product restricting this CTL response was defined. Both the vaccinated and SIVmac-infected monkeys that shared this MHC class I gene product developed CTLs with the same Gag epitope specificity. These findings support the use of recombinant virus vaccines for the prevention of HIV infections in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shen, L -- Chen, Z W -- Miller, M D -- Stallard, V -- Mazzara, G P -- Panicali, D L -- Letvin, N L -- AI20729/AI/NIAID NIH HHS/ -- AI26507/AI/NIAID NIH HHS/ -- CA50139/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1991 Apr 19;252(5004):440-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard Medical School, New England Regional Primate Research Center, Southborough, MA 01772.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1708168" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Viral/biosynthesis ; Antigens, CD/analysis ; Antigens, CD8 ; Antigens, Differentiation, T-Lymphocyte/analysis ; Epitopes/chemistry/immunology ; Gene Products, gag/chemistry/*immunology ; Macaca mulatta ; Molecular Sequence Data ; Peptide Fragments/chemistry/immunology ; Simian Acquired Immunodeficiency Syndrome/*immunology ; Simian Immunodeficiency Virus/*immunology ; T-Lymphocytes, Cytotoxic/*immunology ; T-Lymphocytes, Helper-Inducer/immunology ; Vaccines, Synthetic/*immunology ; Viral Vaccines/*immunology
    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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    Function of the homeodomain protein GHF1 in pituitary cell proliferation (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-12
    Description: Mutations that cause pituitary dwarfism in the mouse reside in the gene encoding the transcription factor growth hormone factor 1 (GHF1 or pit1). These dwarf mice (dw and dwJ) are deficient in growth hormone (GH) and prolactin (PRL) synthesis and exhibit pituitary hypoplasia, suggesting a stem cell defect. With antisense oligonucleotide technology, a cell culture model of this genetic defect was developed. Specific inhibition of GHF1 synthesis by complementary oligonucleotides led to a marked decrease in GH and PRL expression and to a marked decrease in proliferation of somatotrophic cell lines. These results provide direct evidence that the homeodomain protein GHF1 is required not only for the establishment and maintenance of the differentiated phenotype but for cell proliferation as well.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castrillo, J L -- Theill, L E -- Karin, M -- DK38527/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 12;253(5016):197-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1677216" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antisense Elements (Genetics) ; Base Sequence ; *Cell Division ; Cells, Cultured ; DNA/biosynthesis ; DNA-Binding Proteins/*physiology ; Dwarfism/genetics ; Gene Expression Regulation ; *Genes, Homeobox ; Growth Hormone/genetics ; In Vitro Techniques ; Mice ; Molecular Sequence Data ; Pituitary Gland/*cytology/physiology ; Prolactin/genetics ; Transcription Factor Pit-1 ; Transcription Factors/*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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  • 5
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    Protection against malaria by vaccination with sporozoite surface protein 2 plus CS protein (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-03
    Description: The circumsporozoite (CS) protein has been the target for development of malaria sporozoite vaccines for a decade. However, immunization with subunit vaccines based on the CS protein has never given the complete protection found after immunization with irradiated sporozoites. BALB/c mice immunized with irradiated Plasmodium yoelii sporozoites produced antibodies and cytotoxic T cells against a 140-kilodalton protein, sporozoite surface protein 2 (SSP2). Mice immunized with P815 cells that had been transfected with either SSP2 or CS genes were partially protected, and those immunized with a mixture of SSP2 and CS transfectants were completely protected against malaria. These studies emphasize the importance of vaccine delivery systems in achieving protection and define a multi-antigen sporozoite vaccine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Khusmith, S -- Charoenvit, Y -- Kumar, S -- Sedegah, M -- Beaudoin, R L -- Hoffman, S L -- New York, N.Y. -- Science. 1991 May 3;252(5006):715-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Malaria Program, Naval Medical Research Institute, Bethesda, MD 20889.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1827210" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal/immunology ; Antibodies, Protozoan/immunology ; Antigens, Protozoan/genetics/*immunology ; Immunization ; Malaria/*prevention & control ; Mice ; Mice, Inbred BALB C ; Molecular Weight ; Plasmodium yoelii/*immunology ; Protozoan Proteins/genetics/*immunology ; *Protozoan Vaccines ; T-Lymphocytes, Cytotoxic/immunology ; T-Lymphocytes, Helper-Inducer/immunology ; T-Lymphocytes, Regulatory/immunology ; Transfection ; *Vaccination
    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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    Atomic structure of acetylcholinesterase from Torpedo californica: a prototypic acetylcholine-binding protein (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-08-23
    Description: The three-dimensional structure of acetylcholinesterase from Torpedo californica electric organ has been determined by x-ray analysis to 2.8 angstrom resolution. The form crystallized is the glycolipid-anchored homodimer that was purified subsequent to solubilization with a bacterial phosphatidylinositol-specific phospholipase C. The enzyme monomer is an alpha/beta protein that contains 537 amino acids. It consists of a 12-stranded mixed beta sheet surrounded by 14 alpha helices and bears a striking resemblance to several hydrolase structures including dienelactone hydrolase, serine carboxypeptidase-II, three neutral lipases, and haloalkane dehalogenase. The active site is unusual because it contains Glu, not Asp, in the Ser-His-acid catalytic triad and because the relation of the triad to the rest of the protein approximates a mirror image of that seen in the serine proteases. Furthermore, the active site lies near the bottom of a deep and narrow gorge that reaches halfway into the protein. Modeling of acetylcholine binding to the enzyme suggests that the quaternary ammonium ion is bound not to a negatively charged "anionic" site, but rather to some of the 14 aromatic residues that line the gorge.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sussman, J L -- Harel, M -- Frolow, F -- Oefner, C -- Goldman, A -- Toker, L -- Silman, I -- New York, N.Y. -- Science. 1991 Aug 23;253(5022):872-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Structural Chemistry, Weizmann Institute of Science, Rehovot, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1678899" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/*metabolism ; Acetylcholinesterase/*chemistry/metabolism ; Amino Acid Sequence ; Animals ; Binding Sites ; Cell Membrane/enzymology ; Chemistry, Physical ; Crystallization ; Electric Organ/*enzymology ; Glutamates ; Glutamic Acid ; Macromolecular Substances ; Molecular Sequence Data ; Molecular Structure ; Phosphatidylinositols/metabolism ; Physicochemical Phenomena ; Protein Conformation ; Sequence Homology, Nucleic Acid ; *Torpedo ; X-Ray Diffraction
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Translational potentiation of messenger RNA with secondary structure in Xenopus (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-15
    Description: Differential translation of messenger RNA (mRNA) with stable secondary structure in the 5' untranslated leader may contribute to the dramatic changes in protein synthetic patterns that occur during oogenesis and early development. Plasmids that contained the bacterial gene chloramphenicol acetyltransferase and which encoded mRNA with (hpCAT) or without (CAT) a stable hairpin secondary structure in the 5' noncoding region were transcribed in vitro, and the resulting mRNAs were injected into Xenopus oocytes, eggs, and early embryos. During early oogenesis, hpCAT mRNA was translated at less than 3 percent of the efficiency of CAT mRNA. The relative translational potential of hpCAT reached 100 percent in the newly fertilized egg and returned to approximately 3 percent after the midblastula transition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fu, L N -- Ye, R Q -- Browder, L W -- Johnston, R N -- New York, N.Y. -- Science. 1991 Feb 15;251(4995):807-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, University of Calgary, Alberta, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1990443" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Chloramphenicol O-Acetyltransferase/genetics ; Egg Proteins/biosynthesis/genetics ; Molecular Sequence Data ; Nucleic Acid Conformation ; Oogenesis/genetics ; Plasmids ; *Protein Biosynthesis ; RNA, Messenger/*genetics ; Xenopus laevis/embryology/*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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  • 8
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    Direct observation of global protein motion in hemoglobin and myoglobin on picosecond time scales (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-01
    Description: Picosecond phase-grating spectroscopy is highly sensitive to density changes and provides a new holographic approach to the study of protein dynamics. Photodissociation of carbon monoxide from heme proteins induces a well-defined transition from a ligated to a deoxy structure that is important to hemoglobin and myoglobin functionality. Grating spectroscopy was used to observe protein-driven density waves on a picosecond time scale after carbon monoxide dissociation. This result demonstrates that global tertiary structure changes of proteins occur on an extremely fast time scale and provides new insight into the biomechanics of deterministic protein motion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Genberg, L -- Richard, L -- McLendon, G -- Miller, R J -- 1 R01 GM41909-01A1/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 Mar 1;251(4997):1051-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Rochester, NY 14627.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1998121" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carboxyhemoglobin/chemistry ; Hemoglobins/*chemistry ; In Vitro Techniques ; Ligands ; Motion ; Myoglobin/*chemistry ; Oxyhemoglobins/chemistry ; Spectrum Analysis/methods ; Temperature ; Water/chemistry
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Sequence-specific antirepression of histone H1-mediated inhibition of basal RNA polymerase II transcription (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-08
    Description: To understand the principles of control and selectivity in gene expression, the biochemical mechanisms by which promoter- and enhancer-binding factors regulate transcription by RNA polymerase II were analyzed. A general observed repressor of transcription was purified and identified as histone H1. Since many aspects of H1 binding to naked DNA resemble its interaction with chromatin, purified H1 bound to naked DNA was used as a model for the repressed state of the DNA template. Three sequence-specific transcription factors, Sp1, GAL4-VP16, and GAGA factor, were shown to counteract H1-mediated repression (antirepression). In addition, Sp1 and GAL4-VP16, but not the GAGA factor, activated transcription in the absence of H1. Therefore, true activation and antirepression appear to be distinct activities of sequence-specific factors. Furthermore, transcription antirepression by GAL4-VP16 was sustained for several rounds of transcription. These findings, together with previous studies on H1, suggest that H1 participates in repression of the genome in the ground state and that sequence-specific transcription factors induce selected genes by a combination of true activation and release of basal repression that is mediated at least in part by H1.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Croston, G E -- Kerrigan, L A -- Lira, L M -- Marshak, D R -- Kadonaga, J T -- New York, N.Y. -- Science. 1991 Feb 8;251(4994):643-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of California, San Diego, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1899487" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cattle ; Cell-Free System ; DNA-Binding Proteins/physiology ; Drosophila melanogaster/genetics ; *Gene Expression Regulation ; HeLa Cells ; Histones/genetics/*physiology ; Humans ; In Vitro Techniques ; Molecular Sequence Data ; Nucleosomes/physiology ; RNA Polymerase II/*physiology ; Regulatory Sequences, Nucleic Acid ; Repressor Proteins/physiology ; Templates, Genetic ; Transcription Factors/*physiology ; *Transcription, 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
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    Expression cloning of an adenylate cyclase-coupled calcitonin receptor (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-25
    Description: A calcitonin receptor complementary DNA (cDNA) was cloned by expression of a cDNA library from a porcine kidney epithelial cell line in COS cells. The 482-amino acid receptor has high affinity for salmon calcitonin (dissociation constant Kd approximately 6 nM) and is functionally coupled to increases in intracellular cyclic adenosine monophosphate (cAMP). The receptor shows no sequence similarity to other reported G protein-coupled receptors but is homologous to the parathyroid hormone-parathyroid hormone-related peptide (PTH-PTHrP) receptor, indicating that the receptors for these hormones, which regulate calcium homeostasis, represent a new family of G protein-coupled receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, H Y -- Harris, T L -- Flannery, M S -- Aruffo, A -- Kaji, E H -- Gorn, A -- Kolakowski, L F Jr -- Lodish, H F -- Goldring, S R -- AM 03564/AM/NIADDK NIH HHS/ -- HL-41484/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1991 Nov 15;254(5034):1022-4.〈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/1658940" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/physiology ; Amino Acid Sequence ; Animals ; Blotting, Northern ; Calcitonin/*metabolism ; Cloning, Molecular ; Cyclic AMP/physiology ; DNA/genetics ; Gene Expression ; Kidney/physiology ; Molecular Sequence Data ; RNA, Messenger/genetics ; Receptors, Calcitonin ; Receptors, Cell Surface/*genetics ; Swine
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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