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  • 1
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    A functional [NiFe]hydrogenase mimic that catalyzes electron and hydride transfer from H2 (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-02-09
    Description: Chemists have long sought to mimic enzymatic hydrogen activation with structurally simpler compounds. Here, we report a functional [NiFe]-based model of [NiFe]hydrogenase enzymes. This complex heterolytically activates hydrogen to form a hydride complex that is capable of reducing substrates by either hydride ion or electron transfer. Structural investigations were performed by a range of techniques, including x-ray diffraction and neutron scattering, resulting in crystal structures and the finding that the hydrido ligand is predominantly associated with the Fe center. The ligand's hydridic character is manifested in its reactivity with strong acid to liberate H(2).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ogo, Seiji -- Ichikawa, Koji -- Kishima, Takahiro -- Matsumoto, Takahiro -- Nakai, Hidetaka -- Kusaka, Katsuhiro -- Ohhara, Takashi -- New York, N.Y. -- Science. 2013 Feb 8;339(6120):682-4. doi: 10.1126/science.1231345.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉World Premier International Research Center Initiative-International Institute for Carbon-Neutral Energy Research, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan. ogotcm@mail.cstm.kyushu-u.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23393260" target="_blank"〉PubMed〈/a〉
    Keywords: Catalysis ; *Electrons ; Hydrogen/*chemistry ; Hydrogenase/*chemistry/metabolism ; Iron/*chemistry ; Ligands ; Models, Chemical ; Molecular Mimicry ; Molecular Structure ; Nickel/*chemistry ; Organometallic Compounds/*chemistry ; Oxidation-Reduction
    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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    Failure of parturition in mice lacking the prostaglandin F receptor (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-08-01
    Description: Mice lacking the gene encoding the receptor for prostaglandin F2alpha (FP) developed normally but were unable to deliver normal fetuses at term. Although these FP-deficient mice showed no abnormality in the estrous cycle, ovulation, fertilization, or implantation, they did not respond to exogenous oxytocin because of the lack of induction of oxytocin receptor (a proposed triggering event in parturition), and they did not show the normal decline of serum progesterone concentrations that precedes parturition. Ovariectomy at day 19 of pregnancy restored induction of the oxytocin receptor and permitted successful delivery in the FP-deficient mice. These results indicate that parturition is initiated when prostaglandin F2alpha interacts with FP in ovarian luteal cells of the pregnant mice to induce luteolysis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sugimoto, Y -- Yamasaki, A -- Segi, E -- Tsuboi, K -- Aze, Y -- Nishimura, T -- Oida, H -- Yoshida, N -- Tanaka, T -- Katsuyama, M -- Hasumoto, K -- Murata, T -- Hirata, M -- Ushikubi, F -- Negishi, M -- Ichikawa, A -- Narumiya, S -- New York, N.Y. -- Science. 1997 Aug 1;277(5326):681-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Kyoto University, Kyoto 606, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9235889" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Corpus Luteum/*metabolism ; Dinoprost/*metabolism ; Female ; Gene Targeting ; Heterozygote ; Homozygote ; *Labor, Obstetric ; Male ; Mice ; Mice, Inbred C57BL ; Ovariectomy ; Oxytocin/biosynthesis/pharmacology ; Pregnancy ; Progesterone/blood ; Receptors, Oxytocin/biosynthesis ; Receptors, Prostaglandin/genetics/*metabolism ; Uterine Contraction/drug effects ; Uterus/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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  • 3
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    Overview and initial results of the very long baseline interferometry space observatory programme (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-22
    Description: High angular resolution images of extragalactic radio sources are being made with the Highly Advanced Laboratory for Communications and Astronomy (HALCA) satellite and ground-based radio telescopes as part of the Very Long Baseline Interferometry (VLBI) Space Observatory Programme (VSOP). VSOP observations at 1.6 and 5 gigahertz of the milli-arc-second-scale structure of radio quasars enable the quasar core size and the corresponding brightness temperature to be determined, and they enable the motions of jet components that are close to the core to be studied. Here, VSOP images of the gamma-ray source 1156+295, the quasar 1548+056, the ultraluminous quasar 0014+813, and the superluminal quasar 0212+735 are presented and discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hirabayashi -- Hirosawa -- Kobayashi -- Murata -- Edwards -- Fomalont -- Fujisawa -- Ichikawa -- Kii -- Lovell -- Moellenbrock -- Okayasu -- Inoue -- Kawaguchi -- Kameno -- Shibata -- Asaki -- Bushimata -- Enome -- Horiuchi -- Miyaji -- Umemoto -- Migenes V -- Wajima -- Nakajima -- et -- New York, N.Y. -- Science. 1998 Sep 18;281(5384):1825-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉H. Hirabayashi, H. Hirosawa, H. Kobayashi, Y. Murata, P. G. Edwards, E. B. Fomalont, K. Fujisawa, T. Ichikawa, T. Kii, J. E. J. Lovell, G. A. Moellenbrock, and R. Okayasu are with the Institute of Space and Astronautical Science, Sagamihara, Kanagawa 22.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9743489" 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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  • 4
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    KAI1, a metastasis suppressor gene for prostate cancer on human chromosome 11p11.2 (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-05-12
    Description: A gene from human chromosome 11p11.2 was isolated and was shown to suppress metastasis when introduced into rat AT6.1 prostate cancer cells. Expression of this gene, designated KAI1, was reduced in human cell lines derived from metastatic prostate tumors. KAI1 specifies a protein of 267 amino acids, with four hydrophobic and presumably transmembrane domains and one large extracellular hydrophilic domain with three potential N-glycosylation sites. KAI1 is evolutionarily conserved, is expressed in many human tissues, and encodes a member of a structurally distinct family of leukocyte surface glycoproteins. Decreased expression of this gene may be involved in the malignant progression of prostate and other cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dong, J T -- Lamb, P W -- Rinker-Schaeffer, C W -- Vukanovic, J -- Ichikawa, T -- Isaacs, J T -- Barrett, J C -- CA 58236/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1995 May 12;268(5212):884-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, National Institute of Health, Research Triangle Park, NC 27709, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7754374" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens, CD/chemistry/*genetics/physiology ; Antigens, CD82 ; Base Sequence ; Biological Evolution ; *Chromosomes, Human, Pair 11 ; Gene Expression ; *Genes, Tumor Suppressor ; Humans ; Male ; Membrane Glycoproteins/chemistry/*genetics/physiology ; Mice ; Mice, SCID ; Molecular Sequence Data ; Neoplasm Metastasis/*genetics ; Prostatic Neoplasms/*genetics/pathology ; *Proto-Oncogene Proteins ; Rats ; Transfection ; 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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  • 5
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    Entorhinal-hippocampal interactions revealed by real-time imaging (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-05-24
    Description: The entorhinal cortex provides the major cortical input to the hippocampus, and both structures have been implicated in memory processes. The dynamics of neuronal circuits in the entorhinal-hippocampal system were studied in slices by optical imaging with high spatial and temporal resolution. Reverberation of neural activity was detected in the entorhinal cortex and was more prominent when the inhibition due to gamma-aminobutyric acid was slightly suppressed. Neural activity was transferred in a frequency-dependent way from the entorhinal cortex to the hippocampus. The entorhinal neuronal circuit could contribute to memory processes by holding information and selectively gating the entry of information into the hippocampus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Iijima, T -- Witter, M P -- Ichikawa, M -- Tominaga, T -- Kajiwara, R -- Matsumoto, G -- New York, N.Y. -- Science. 1996 May 24;272(5265):1176-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular and Cellular Neuroscience Section, Electrotechnical Laboratory, Ibaraki, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8638163" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bicuculline/pharmacology ; Electric Stimulation ; Entorhinal Cortex/*physiology ; GABA Antagonists/pharmacology ; Hippocampus/*physiology ; Image Processing, Computer-Assisted ; In Vitro Techniques ; Male ; Memory/*physiology ; Microscopy, Fluorescence ; Neural Pathways ; Rats ; Rats, Wistar ; Synaptic Transmission/drug effects
    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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