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  • Books
  • Articles  (27)
  • Springer Nature  (18)
  • American Association for the Advancement of Science (AAAS)  (9)
  • 1985-1989  (27)
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  • Books
  • Articles  (27)
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  • 1
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    Molecular cloning of two types of GAP complementary DNA from human placenta (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-23
    Description: The ras p21 GTPase-activating protein (GAP) was purified from human placental tissue. Internal amino acid sequence was obtained from this 120,000-dalton protein and, by means of this sequence, two types of complementary DNA clones were isolated and characterized. One type encoded GAP with a predicted molecular mass of 116,000 daltons and 96% identity with bovine GAP. The messenger RNA of this GAP was detected in human lung, brain, liver, leukocytes, and placenta. The second type appeared to be generated by a differential splicing mechanism and encoded a novel form of GAP with a predicted molecular mass of 100,400 daltons. This protein lacks the hydrophobic amino terminus characteristic of the larger species, but retains GAP activity. The messenger RNA of this type was abundantly expressed in placenta and in several human cell lines, but not in adult tissues.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Trahey, M -- Wong, G -- Halenbeck, R -- Rubinfeld, B -- Martin, G A -- Ladner, M -- Long, C M -- Crosier, W J -- Watt, K -- Koths, K -- New York, N.Y. -- Science. 1988 Dec 23;242(4886):1697-700.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Cetus Corp., Emeryville, CA 94608.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201259" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Brain Chemistry ; *Cloning, Molecular ; DNA/*genetics/isolation & purification ; Female ; GTPase-Activating Proteins ; Gene Expression Regulation ; Humans ; Leukocytes/analysis ; Liver/analysis ; Lung/analysis ; Molecular Sequence Data ; Molecular Weight ; Nucleic Acid Hybridization ; Oligonucleotide Probes ; Placenta/*analysis ; Pregnancy ; Proteins/*genetics/isolation & purification ; RNA, Messenger/analysis/genetics ; Sequence Homology, Nucleic Acid ; ras GTPase-Activating Proteins
    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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    Sporozoite vaccine induces genetically restricted T cell elimination of malaria from hepatocytes (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-06-02
    Description: The target of the CD8+ T cell-dependent immunity that protects mice immunized with irradiation-attenuated malaria sporozoites has not been established. Immune BALB/c mice were shown to develop malaria-specific, CD8+ T cell-dependent inflammatory infiltrates in their livers after challenge with Plasmodium berghei sporozoites. Spleen cells from immune BALB/c and C57BL/6 mice eliminated hepatocytes infected with the liver stage of P. berghei in vitro. The activity against infected hepatocytes is not inhibited by antibodies to interferon-gamma and is not present in culture supernatants. It is genetically restricted, an indication that malaria antigens on the hepatocyte surface are recognized by immune T effector cells. Subunit vaccine development will require identification of the antigens recognized by these T cells and a method of immunization that induces such immunity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, S L -- Isenbarger, D -- Long, G W -- Sedegah, M -- Szarfman, A -- Waters, L -- Hollingdale, M R -- van der Meide, P H -- Finbloom, D S -- Ballou, W R -- New York, N.Y. -- Science. 1989 Jun 2;244(4908):1078-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20814.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2524877" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/immunology ; Antibodies, Protozoan/analysis ; Antigens, Protozoan/genetics/immunology ; H-2 Antigens/immunology ; *Immunization ; Interferon-gamma/immunology/pharmacology ; Liver/immunology/*parasitology ; Malaria/*immunology/parasitology ; Mice ; Mice, Inbred BALB C ; Mice, Inbred C57BL ; Plasmodium berghei/*immunology ; Recombinant Proteins ; Spleen/immunology ; T-Lymphocytes, Regulatory/*immunology ; 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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  • 3
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    Endogenous anticonvulsant substance in rat cerebrospinal fluid after a generalized seizure (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-05-31
    Description: Cerebrospinal fluid taken from rats subjected to electroshock-induced seizures and injected into the cerebral ventricles of rats that had not been shocked increased the seizure threshold of the recipients. The anticonvulsant activity of the donor cerebrospinal fluid was antagonized by opioid antagonists and enhanced by peptidase inhibitors. These results suggest the existence of an endogenous anticonvulsant substance in rat cerebrospinal fluid, possibly opioid in nature, which is activated as a consequence of a seizure and which may play a critical role in postseizure inhibition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tortella, F C -- Long, J B -- New York, N.Y. -- Science. 1985 May 31;228(4703):1106-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2986292" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anticonvulsants/*cerebrospinal fluid ; Electroshock ; Enkephalin, Leucine/analogs & derivatives/pharmacology ; Male ; Naloxone/pharmacology ; Narcotic Antagonists/pharmacology ; Peptide Hydrolases ; Rats ; Rats, Inbred Strains ; Receptors, Opioid/drug effects ; Receptors, Opioid, delta ; Seizures/*cerebrospinal fluid
    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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    A plant flavone, luteolin, induces expression of Rhizobium meliloti nodulation genes (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-08-29
    Description: The symbiotic interaction of Rhizobium meliloti and alfalfa results in the formation of nitrogen-fixing root nodules. Rhizobium meliloti nodABC genes are required for the early host responses of cortical cell divisions and root hair curling. The induction of nodABC expression by alfalfa exudates demonstrates host-symbiont signaling at an early stage in nodule development. The inducer molecule for nodABC expression was isolated from plant exudate by constructing a nodABC-lacZ fusion to monitor the inducing activity. From ultraviolet-visible absorption spectra, proton nuclear magnetic resonance, and mass spectrometry, the inducer was determined to be 3',4', 5,7-tetrahydroxyflavone (luteolin). Luteolin is a normal secondary plant metabolite found throughout the plant kingdom that may serve to control nodABC expression during nodule development. This regulatory role for a flavone contrasts with the function of some flavonoids as defense compounds.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peters, N K -- Frost, J W -- Long, S R -- R01-GM30962/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1986 Aug 29;233(4767):977-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3738520" target="_blank"〉PubMed〈/a〉
    Keywords: Flavonoids/*pharmacology ; Gene Expression Regulation/drug effects ; Luteolin ; Medicago sativa/physiology ; Nitrogen Fixation/*drug effects ; Rhizobium/*drug effects/genetics ; Symbiosis/drug effects
    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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    Dynamic atomic-level rearrangements in small gold particles (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-08-22
    Description: Small metal particles (〈5 nanometers), which are widely used in catalysis, have physical and chemical properties that are markedly different from those of the bulk metal. The differences are related to crystal structure, and it is therefore significant that structral rearrangements in small particles have been observed in real time by using high-resolution electron microscopy. A detailed investigation at the atomic level has been made of the factors affecting the dynamic activity of small gold crystals that are supported on thin films of amorphous carbon, silicon, and germanium. The rate of activity depends mainly on the current density of the incident electron beam and the degree of contact of the particle with the substrate, but this rate decreases rapidly as the particle size is increased. The activity of the particles is very similar on either carbon or silicon, but it is generally less marked on germanium because of increased contact between the particle and the substrate. The electron beam effectively heats the particles, and it appears that their dynamic behavior depends on their thermal contact with the substrate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, D J -- Petford-Long, A K -- Wallenberg, L R -- Bovin, J O -- New York, N.Y. -- Science. 1986 Aug 22;233(4766):872-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17752214" target="_blank"〉PubMed〈/a〉
    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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    Time-resolved three-dimensional concentration measurements in a gas jet (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-03-06
    Description: Turbulence can greatly influence reaction and heat transfer rates in fluids. The topology of the three-dimensional interface between mixing fluids directly determines the location and degree of reaction. The time-resolved measurement of the three-dimensional concentration field in a transitional gas jet is reported. A thin sheet of laser light was swept through the flow volume by a rotating mirror in a time brief enough that motion of the gas was minimal. The light sheet illuminated different parallel planes within the flow, and light scattered from particles seeding the jet was imaged onto a detector. The series of two-dimensional measurements made during one scan of the flow volume constituted a full three-dimensional mapping of structures within the flow. Computer graphics software was used to reconstruct and visualize three-dimensional surfaces of constant concentration and the magnitude of the concentration gradient vector over such surfaces.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yip, B -- Lam, J K -- Winter, M -- Long, M B -- New York, N.Y. -- Science. 1987 Mar 6;235(4793):1209-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17818981" target="_blank"〉PubMed〈/a〉
    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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    Blood-brain barrier: endogenous modulation by adrenal-cortical function (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-03-29
    Description: The blood-brain barrier restricts the passage of molecules from the blood to the brain. The permeability of the barrier to iodine-125-labeled bovine serum albumin was examined in rats that had undergone adrenalectomy, adrenal demedullation, and corticosterone replacement. Adrenalectomy, but not adrenal demedullation, increased the permeability of brain tissue to the isotopically labeled macromolecule; corticosterone replacement reversed this effect. These results indicate that the blood-brain barrier may be hormonally regulated; that is, the pituitary-adrenal axis may physiologically modulate the permeability of the brain microvasculature to macromolecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Long, J B -- Holaday, J W -- New York, N.Y. -- Science. 1985 Mar 29;227(4694):1580-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3975627" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenal Cortex/*physiology ; Adrenal Medulla/physiology ; Adrenalectomy ; Animals ; Blood Pressure ; *Blood-Brain Barrier ; Central Nervous System/physiology ; Corticosterone/blood/physiology ; Male ; Pituitary-Adrenal System/physiology ; Rats ; Rats, Inbred Strains ; Serum Albumin, Bovine/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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  • 8
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    Computer-assisted analysis in organic synthesis (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-04-26
    Description: The planning of alternative routes for the synthesis of complex organic molecules has been facilitated by the formulation of guiding strategies that can be applied to a broad range of problems. Analysis of organic synthesis can be carried out in the retrosynthetic direction, opposite to the actual process of chemical synthesis, or bidirectionally, that is, as a combined retrosynthetic and synthetic search. An interactive computer program is described which utilizes the general strategies of retrosynthetic analysis and an appropriate database to generate pathways of chemical intermediates for chemical synthesis of a particular target structure. Computer graphics and standard chemical structures are used for man-machine communication.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Corey, E J -- Long, A K -- Rubenstein, S D -- New York, N.Y. -- Science. 1985 Apr 26;228(4698):408-18.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3838594" target="_blank"〉PubMed〈/a〉
    Keywords: Chemical Phenomena ; Chemistry ; Chemistry, Organic/*methods ; *Computers ; Forecasting ; Software
    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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    Cation-ratio and accelerator radiocarbon dating of rock varnish on mojave artifacts and landforms (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-02-21
    Description: The first accelerator radiocarbon dates of rock varnishes are reported along with potassium/argon ages of lava flows and conventional radiocarbon dates of pluvial lake shorelines, in an empirical calibration of rock varnish K(+) + Ca(2+)/Ti(4+) ratios with age in the Mojave Desert, eastern California. This calibration was used to determine the cation-ratio dates of 167 artifacts. Although cation-ratio dating is an experimental method, some dates suggest human occupation of the Mojave Desert in the late Pleistocene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dorn, R I -- Bamforth, D B -- Cahill, T A -- Dohrenwend, J C -- Turrin, B D -- Donahue, D J -- Jull, A J -- Long, A -- Macko, M E -- Weil, E B -- Whitley, D S -- Zabel, T H -- New York, N.Y. -- Science. 1986 Feb 21;231(4740):830-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17774077" target="_blank"〉PubMed〈/a〉
    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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    Production and biological activity of rebeccamycin, a novel antitumor agent. (1987)
    Springer Nature
    Details
    Publication Date: 1987-01-01
    Print ISSN: 0021-8820
    Electronic ISSN: 1881-1469
    Topics: Chemistry and Pharmacology , Medicine
    Published by Springer Nature
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