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  • 2020-2022  (820)
  • 1990-1994  (772)
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  • 1
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    Oriented microfractures in Cajon Pass drill cores: stress field near the San Andreas Fault (1990)
    In:  J. Geophys. Res., Taipei, AGU, vol. 95, no. 1-4, pp. 11135-11142, pp. B05204, (ISSN: 1340-4202)
    Details
    Publication Date: 1990
    Keywords: cracks and fractures (.NE. fracturing) ; Stress ; Borehole geophys. ; Fault zone ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Tumor resistance to alkylating agents conferred by mechanisms operative only in vivo (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-03-23
    Description: EMT-6 murine mammary tumors were made resistant to cis-diamminedichloroplatinum (II) (CDDP), carboplatin, cyclophosphamide (CTX), or thiotepa in vivo by treatment of tumor-bearing animals with the drug during a 6-month period. In spite of high levels of in vivo resistance, no significant resistance was observed when the cells from these tumors were exposed to the drugs in vitro. The pharmacokinetics of CDDP and CTX were altered in animals bearing the respective resistant tumors. The resistance of all tumor lines except for the EMT-6/thiotepa decreased during 3 to 6 months in vivo passage in the absence of drugs. These results indicate that very high levels of resistance to anticancer drugs can develop through mechanisms that are expressed only in vivo.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teicher, B A -- Herman, T S -- Holden, S A -- Wang, Y Y -- Pfeffer, M R -- Crawford, J W -- Frei, E 3rd -- P01-CA38497/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Mar 23;247(4949 Pt 1):1457-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dana-Farber Cancer Institute, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2108497" target="_blank"〉PubMed〈/a〉
    Keywords: Alkylating Agents/pharmacokinetics/*therapeutic use ; Animals ; Antineoplastic Agents/pharmacokinetics/*therapeutic use ; Carboplatin ; Cisplatin/therapeutic use ; Cyclophosphamide/therapeutic use ; Drug Resistance ; Kidney/metabolism ; Liver/metabolism ; Mammary Neoplasms, Experimental/*drug therapy/metabolism ; Mice ; Mice, Inbred BALB C ; Organoplatinum Compounds/therapeutic use ; Sulfhydryl Compounds/analysis ; Thiotepa/therapeutic use ; Tissue Distribution ; Tumor Cells, Cultured
    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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    Long-term high-titer neutralizing activity induced by octameric synthetic HIV-1 antigen (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-10-11
    Description: A titer for homologous viral neutralization activity (greater than 1:19,683) was observed after a 3.5-year immunization period with an octameric, branching peptide representing the principal neutralizing determinant (PND) of the human immunodeficiency virus-1IIIB envelope protein. Booster immunizations elicited persistent and potent antibodies in guinea pigs, exceeding responses produced by a conventional bovine serum albumin conjugate by 100-fold. Peptide length, central presentation of a conserved sequence, and inclusion of an upstream sequence contributed to immunogenicity. Titers (greater than 1:1,000) of heterotypic neutralizing antibodies also developed. Octameric PND peptides are a promising approach for an acquired immunodeficiency syndrome (AIDS) vaccine.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, C Y -- Looney, D J -- Li, M L -- Walfield, A M -- Ye, J -- Hosein, B -- Tam, J P -- Wong-Staal, F -- IU01-AI-30238/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1991 Oct 11;254(5029):285-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉United Biomedical, Inc., Lake Success, NY 11042.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925584" target="_blank"〉PubMed〈/a〉
    Keywords: AIDS Vaccines/genetics/*immunology ; Amino Acid Sequence ; Animals ; Female ; Guinea Pigs ; HIV Antigens/genetics/*immunology ; HIV-1/*immunology ; Molecular Sequence Data ; Neutralization Tests ; Vaccines, Synthetic/genetics/*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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    Cell cycle-regulated binding of c-Abl tyrosine kinase to DNA (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-04-17
    Description: The proto-oncogene c-abl encodes a protein tyrosine kinase that is localized in the cytoplasm and the nucleus. The large carboxyl-terminal segment of c-Abl was found to contain a DNA-binding domain that was necessary for the association of c-Abl with chromatin. The DNA-binding activity of c-Abl was lost during mitosis when the carboxyl-terminal segment became phosphorylated. In vitro phosphorylation of the DNA-binding domain by cdc2 kinase abolished DNA binding. Homozygous mutant mice expressing a c-Abl tyrosine kinase without the DNA-binding domain have been reported to die of multiple defects at birth. Thus, binding of the c-Abl tyrosine kinase to DNA may be essential to its biological function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kipreos, E T -- Wang, J Y -- CA 43054/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Apr 17;256(5055):382-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, University of California San Diego, La Jolla 92093-0116.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1566087" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Cell Cycle/*physiology ; Chromatography, Affinity ; DNA/*metabolism ; *Genes, abl ; Mice ; Molecular Sequence Data ; Mutagenesis ; Phosphorylation ; Phosphoserine/metabolism ; Phosphothreonine/metabolism ; Protein-Tyrosine Kinases/chemistry/genetics/*metabolism ; Proto-Oncogene Proteins c-abl/chemistry/genetics/*metabolism ; Structure-Activity Relationship
    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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    Regulation of kainate receptors by cAMP-dependent protein kinase and phosphatases (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-09-06
    Description: In the mammalian central nervous system, receptors for excitatory amino acid neurotransmitters such as the alpha-amino-3-hydroxy-5-methyl-4- isoxazolepropionic acid (AMPA)-kainate receptor mediate a large fraction of excitatory transmission. Currents induced by activation of the AMPA-kainate receptor were potentiated by agents that specifically stimulate adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase A (PKA) activity or were supported by intracellular application of the catalytic subunit of PKA by itself or in combination with cAMP. Furthermore, depression of these currents by a competitive inhibitor of PKA indicates that AMPA-kainate receptors are regulated by endogenous PKA. Endogenous protein phosphatases also regulate these receptors because an inhibitor of cellular phosphates enhanced kainate currents. Modulation of PKA and phosphatases may regulate the function of these receptors and thus contribute to synaptic plasticity in hippocampal neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, L Y -- Salter, M W -- MacDonald, J F -- New York, N.Y. -- Science. 1991 Sep 6;253(5024):1132-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Toronto, Ontario, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1653455" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells, Cultured ; Cyclic AMP/pharmacology/physiology ; Ethers, Cyclic/*pharmacology ; Fetus ; Hippocampus/*physiology ; Homeostasis ; Kainic Acid/*metabolism ; Kinetics ; Macromolecular Substances ; Membrane Potentials/drug effects ; Mice ; N-Methylaspartate/pharmacology ; Neurons/drug effects/*physiology ; Okadaic Acid ; Phosphoprotein Phosphatases/*metabolism ; Protein Kinase Inhibitors ; Protein Kinases/*metabolism ; Receptors, Kainic Acid ; Receptors, Neurotransmitter/drug effects/*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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  • 6
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    Phase Transition and Thermal Expansion of MgSiO3 Perovskite (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-01-25
    Description: Results from in situ x-ray diffraction experiments with a DIA-type cubic anvil apparatus (SAM 85) reveal that MgSiO(3) perovskite transforms from the orthorhombic Pbnm symmetry to another perovskite-type structure above 600 kelvin (K) at pressures of 7.3 gigapascals; the apparent volume increase across the transition is 0.7%. Unit-cell volume increased linearly with temperature, both below (1.44 x 10(-5) K(-1)) and above (1.55 x 10(-5) K(-1)) the transition. These results indicate that the physical properties measured on the Pbnm phase should be used with great caution because they may not be applicable to the earth's lower mantle. A density analysis based on the new data yields an iron content of 10.4 weight percent for a pyrolite composition under conditions corresponding to the lower mantle. All current equation-of-state data are compatible with constant chemical composition in the upper and lower mantle; thus, these data imply that a chemically layered mantle is unnecessary, and whole-mantle convection is possible.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Y -- Weidner, D J -- Liebermann, R C -- Liu, X -- Ko, J -- Vaughan, M T -- Zhao, Y -- Yeganeh-Haeri, A -- Pacalo, R E -- New York, N.Y. -- Science. 1991 Jan 25;251(4992):410-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17775105" 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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    Deficient hippocampal long-term potentiation in alpha-calcium-calmodulin kinase II mutant mice (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-07-10
    Description: As a first step in a program to use genetically altered mice in the study of memory mechanisms, mutant mice were produced that do not express the alpha-calcium-calmodulin-dependent kinase II (alpha-CaMKII). The alpha-CaMKII is highly enriched in postsynaptic densities of hippocampus and neocortex and may be involved in the regulation of long-term potentiation (LTP). Such mutant mice exhibited mostly normal behaviors and presented no obvious neuroanatomical defects. Whole cell recordings reveal that postsynaptic mechanisms, including N-methyl-D-aspartate (NMDA) receptor function, are intact. Despite normal postsynaptic mechanisms, these mice are deficient in their ability to produce LTP and are therefore a suitable model for studying the relation between LTP and learning processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silva, A J -- Stevens, C F -- Tonegawa, S -- Wang, Y -- 5 R01 NS 12961-17/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1992 Jul 10;257(5067):201-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Center for Cancer Research, Cambridge, MA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1378648" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal/physiology ; Blotting, Northern ; Blotting, Southern ; Calcium-Calmodulin-Dependent Protein Kinases ; Chromosome Mapping ; DNA/analysis ; Electrophysiology ; Female ; Hippocampus/*physiology ; Learning/physiology ; Male ; Mice ; Mice, Inbred BALB C ; Mice, Mutant Strains/*genetics ; Mutagenesis, Site-Directed ; Plasmids ; Protein Kinases/*deficiency/*physiology ; RNA/analysis ; Receptors, N-Methyl-D-Aspartate ; Synapses/physiology ; Transfection
    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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    Differential phosphorylation of c-Abl in cell cycle determined by cdc2 kinase and phosphatase activity (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-13
    Description: The product of the c-abl proto-oncogene (c-Abl) is phosphorylated on three sites during interphase and seven additional sites during mitosis. Two interphase and all mitotic c-Abl sites are phosphorylated by cdc2 kinase isolated from either interphase or mitotic cells, with the mitotic cdc2 having an 11-fold higher activity. Inhibition of phosphatases with okadaic acid in interphase cells leads to the phosphorylation of c-Abl mitotic sites, indicating that those sites are preferentially dephosphorylated during interphase. The differential phosphorylation of c-Abl in the cell cycle is therefore determined by an equilibrium between cdc2 kinase and protein phosphatase activities. Treatment of interphase cells with okadaic acid leads to a rounded morphology similar to that observed during mitosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kipreos, E T -- Wang, J Y -- CA43054/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Apr 13;248(4952):217-20.〈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/2183353" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; CDC2 Protein Kinase ; *Cell Cycle ; Cells, Cultured ; Ethers, Cyclic/pharmacology ; Interphase/drug effects ; Mice ; Mice, Inbred Strains ; Molecular Sequence Data ; Molecular Weight ; Okadaic Acid ; Peptide Fragments/isolation & purification ; Peptide Mapping ; Phosphoproteins/*metabolism ; Phosphorylation ; Protein-Tyrosine Kinases/*metabolism ; Proto-Oncogene Proteins/isolation & purification/*metabolism ; Proto-Oncogene Proteins c-abl
    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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    Twinning in MgSiO3 Perovskite (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-27
    Description: Crystals of MgSiO(3) perovskite synthesized at high pressures and temperatures have orthorhombic symmetry under ambient conditions. Examination by transmission electron microscopy shows that the microstructure of crystals synthesized at 26 gigapascals and 1600 degrees C is dominated by a large number of twin domains that are related by reflection operations with respect to {112} and {110} planes. These twins may be associated with the transformations of MgSiO(3) perovskite from the cubic to tetragonal and tetragonal to orthorhombic phases, respectively, upon decreasing pressure and temperature. These observations suggest that under the experimental synthesis conditions, and perhaps in the earth's lower mantle, the stable phase of MgSiO(3) might have the cubic perovskite structure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Y -- Guyot, F -- Yeganeh-Haeri, A -- Liebermann, R C -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):468-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17815597" 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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    Regulation of the Ets-related transcription factor Elf-1 by binding to the retinoblastoma protein (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-05-28
    Description: The retinoblastoma gene product (Rb) is a nuclear phosphoprotein that regulates cell cycle progression. Elf-1 is a lymphoid-specific Ets transcription factor that regulates inducible gene expression during T cell activation. In this report, it is demonstrated that Elf-1 contains a sequence motif that is highly related to the Rb binding sites of several viral oncoproteins and binds to the pocket region of Rb both in vitro and in vivo. Elf-1 binds exclusively to the underphosphorylated form of Rb and fails to bind to Rb mutants derived from patients with retinoblastoma. Co-immunoprecipitation experiments demonstrated an association between Elf-1 and Rb in resting normal human T cells. After T cell activation, the phosphorylation of Rb results in the release of Elf-1, which is correlated temporally with the activation of Elf-1-mediated transcription. Overexpression of a phosphorylation-defective form of Rb inhibited Elf-1-dependent transcription during T cell activation. These results demonstrate that Rb interacts specifically with a lineage-restricted Ets transcription factor. This regulated interaction may be important for the coordination of lineage-specific effector functions such as lymphokine production with cell cycle progression in activated T cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, C Y -- Petryniak, B -- Thompson, C B -- Kaelin, W G -- Leiden, J M -- R01 AI29673-01/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1993 May 28;260(5112):1330-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8493578" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Binding Sites ; Cell Cycle ; Cell Line ; DNA-Binding Proteins/chemistry/*metabolism ; Eye Neoplasms/genetics ; Humans ; Lymphocyte Activation ; Molecular Sequence Data ; Mutation ; Oligodeoxyribonucleotides ; Phosphorylation ; Recombinant Fusion Proteins/metabolism ; Retinoblastoma/genetics ; Retinoblastoma Protein/*metabolism ; T-Lymphocytes/immunology/*metabolism ; Transcription Factors/chemistry/*metabolism ; 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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