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  • 2000-2004  (439)
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  • 1970-1974  (70)
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  • 1
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    Reversible molecular adsorption based on multiple-point interaction by shrinkable gels (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-24
    Description: A general approach is presented for creating polymer gels that can recognize and capture a target molecule by multiple-point interaction and that can reversibly change their affinity to the target by more than one order of magnitude. The polymers consist of majority monomers that make the gel reversibly swell and shrink and minority monomers that constitute multiple-point adsorption centers for the target molecule. Multiple-point interaction is experimentally proven by power laws found between the affinity and the concentration of the adsorbing monomers within the gels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oya, T -- Enoki, T -- Grosberg, A Y -- Masamune, S -- Sakiyama, T -- Takeoka, Y -- Tanaka, K -- Wang, G -- Yilmaz, Y -- Feld, M S -- Dasari, R -- Tanaka, T -- New York, N.Y. -- Science. 1999 Nov 19;286(5444):1543-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Center for Materials Science and Engineering, Department of Chemistry, George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. toyo@mit.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10567256" target="_blank"〉PubMed〈/a〉
    Keywords: Adsorption ; Ammonium Chloride/*chemistry ; Arylsulfonates/*chemistry ; Chlorides/chemistry ; Gels/*chemistry ; Methacrylates/*chemistry ; Polymers/*chemistry ; Spectrometry, Fluorescence ; Spectrophotometry, Ultraviolet ; Temperature
    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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    Spontaneous bubble domain formation in a layered ferromagnetic crystal (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-18
    Description: Magnetic domain structure on the surface of the layer-structured ferromagnet La1.4Sr1.6Mn2O7 was observed in the temperature range from 37 to 97 kelvin with a scanning Hall probe microscope. The sensitivity to temperature of the domain structure changes was large relative to that in conventional ferromagnets. The stable and spontaneous appearance of magnetic bubble domains without an external magnetic field was observed in the neighborhood of 70 kelvin. The phenomenon observed could provide a potential route toward magnetic bubble memory.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fukumura -- Sugawara -- Hasegawa -- Tanaka -- Sakaki -- Kimura -- Tokura -- New York, N.Y. -- Science. 1999 Jun 18;284(5422):1969-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Chemistry, University of Tokyo, Tokyo 113-8656, Japan. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan. Research Center for Advanced Science and Technology, University of Tokyo, T.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10373110" 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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  • 3
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    Epilepsy and exacerbation of brain injury in mice lacking the glutamate transporter GLT-1 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-13
    Description: Extracellular levels of the excitatory neurotransmitter glutamate in the nervous system are maintained by transporters that actively remove glutamate from the extracellular space. Homozygous mice deficient in GLT-1, a widely distributed astrocytic glutamate transporter, show lethal spontaneous seizures and increased susceptibility to acute cortical injury. These effects can be attributed to elevated levels of residual glutamate in the brains of these mice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tanaka, K -- Watase, K -- Manabe, T -- Yamada, K -- Watanabe, M -- Takahashi, K -- Iwama, H -- Nishikawa, T -- Ichihara, N -- Kikuchi, T -- Okuyama, S -- Kawashima, N -- Hori, S -- Takimoto, M -- Wada, K -- New York, N.Y. -- Science. 1997 Jun 13;276(5319):1699-702.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Degenerative Neurological Diseases, National Institute of Neuroscience, Kodaira, Tokyo 187, Japan. tanaka@ncnaxp.ncap.go.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9180080" target="_blank"〉PubMed〈/a〉
    Keywords: ATP-Binding Cassette Transporters/genetics/*metabolism ; Amino Acid Transport System X-AG ; Animals ; Biological Transport ; Brain/*metabolism/pathology ; Brain Injuries/*metabolism/pathology ; Electroencephalography ; Epilepsy/*metabolism/pathology ; Gene Targeting ; Glutamic Acid/*metabolism ; Hippocampus/metabolism/pathology ; Mice ; Mice, Inbred C57BL ; Nerve Degeneration ; Pyramidal Cells/pathology/physiology ; Synapses/metabolism ; Synaptic Transmission
    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 discrete self-assembled metal array in artificial DNA (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-02-22
    Description: DNA has a structural basis to array functionalized building blocks. Here we report the synthesis of a series of artificial oligonucleotides, d(5'-GH(n)C-3') (n = 1 to 5), with hydroxypyridone nucleobases (H) as flat bidentate ligands. Right-handed double helices of the oligonucleotides, nCu2+.d(5'-GH(n)C-3')2 (n = 1 to 5), were quantitatively formed through copper ion (Cu2+)-mediated alternative base pairing (H-Cu2+-H), where the Cu2+ ions incorporated into each complex were aligned along the helix axes inside the duplexes with the Cu2+-Cu2+ distance of 3.7 +/- 0.1 angstroms. The Cu2+ ions were coupled ferromagnetically with one another through unpaired d electrons to form magnetic chains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tanaka, Kentaro -- Tengeiji, Atsushi -- Kato, Tatsuhisa -- Toyama, Namiki -- Shionoya, Mitsuhiko -- New York, N.Y. -- Science. 2003 Feb 21;299(5610):1212-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12595687" target="_blank"〉PubMed〈/a〉
    Keywords: Base Pairing ; Circular Dichroism ; Copper/*chemistry ; DNA/*chemical synthesis/*chemistry ; Electron Spin Resonance Spectroscopy ; Electrons ; Ligands ; Magnetics ; Nucleic Acid Conformation ; Oligodeoxyribonucleotides/*chemical synthesis/*chemistry ; Pyridones/chemistry ; Spectrophotometry, Ultraviolet ; Thermodynamics
    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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    Neuronal correlates of goal-based motor selection in the prefrontal cortex (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-07-12
    Description: Choosing an action that leads to a desired goal requires an understanding of the linkages between actions and their outcomes. We investigated neural mechanisms of such goal-based action selection. We trained monkeys on a task in which the relation between visual cues, action types, and reward conditions changed regularly, such that the monkeys selected their actions based on anticipated reward conditions. A significant number of neurons in the medial prefrontal cortex were activated, after cue presentation and before motor execution, only by particular action-reward combinations. This prefrontal activity is likely to underlie goal-based action selection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matsumoto, Kenji -- Suzuki, Wataru -- Tanaka, Keiji -- New York, N.Y. -- Science. 2003 Jul 11;301(5630):229-32.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cognitive Brain Mapping Laboratory, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. matsumot@postman.riken.go.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12855813" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Analysis of Variance ; Animals ; Brain Mapping ; Conditioning (Psychology) ; Cues ; Decision Making ; *Goals ; Haplorhini ; *Learning ; Memory/physiology ; Neurons/*physiology ; Prefrontal Cortex/*physiology ; Psychomotor Performance ; *Reward
    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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    Neuroscience. Conflict and cognitive control (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-02-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matsumoto, Kenji -- Tanaka, Keiji -- New York, N.Y. -- Science. 2004 Feb 13;303(5660):969-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cognitive Brain Mapping Laboratory, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan. matsumot@riken.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14963319" target="_blank"〉PubMed〈/a〉
    Keywords: Brain Mapping ; *Cognition ; *Conflict (Psychology) ; Cues ; Frontal Lobe/*physiology ; Gyrus Cinguli/*physiology ; Humans ; Magnetic Resonance Imaging ; Neurons/physiology ; Neuropsychological Tests ; Prefrontal Cortex/*physiology ; Reaction Time
    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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    Nuclear encoding of a chloroplast RNA polymerase sigma subunit in a red alga (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-06-28
    Description: A chloroplast RNA polymerase sigma factor is encoded by a nuclear gene, sigA, in the red alga Cyanidium caldarium RK-1. The encoded protein functions as an RNA polymerase sigma factor in vitro and it is localized to the chloroplast in vivo. SigA shows high sequence similarity to the sigma factors of cyanobacteria, which is indicative of the ancestral endosymbiotic event and subsequent transfer of the sigA gene to the nuclear genome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tanaka, K -- Oikawa, K -- Ohta, N -- Kuroiwa, H -- Kuroiwa, T -- Takahashi, H -- New York, N.Y. -- Science. 1996 Jun 28;272(5270):1932-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular and Cellular Biosciences, University of Tokyo, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8658165" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Blotting, Southern ; Cell Nucleus/genetics ; Chloroplasts/*enzymology/genetics ; DNA-Directed RNA Polymerases/chemistry/*genetics/isolation & ; purification/metabolism ; Molecular Sequence Data ; Recombinant Proteins/isolation & purification/metabolism ; Rhodophyta/enzymology/*genetics/ultrastructure ; Sequence Alignment ; Sigma Factor/chemistry/*genetics/isolation & purification/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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    Rho1p, a yeast protein at the interface between cell polarization and morphogenesis (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-04-12
    Description: The enzyme that catalyzes the synthesis of the major structural component of the yeast cell wall, beta(1--〉3)-D-glucan synthase (also known as 1,3-beta-glucan synthase), requires a guanosine triphosphate (GTP) binding protein for activity. The GTP binding protein was identified as Rho1p. The rho1 mutants were defective in GTP stimulation of glucan synthase, and the defect was corrected by addition of purified or recombinant Rho1p. A protein missing in purified preparations from a rho1 strain was identified as Rho1p. Rho1p also regulates protein kinase C, which controls a mitogen-activated protein kinase cascade. Experiments with a dominant positive PKC1 gene showed that the two effects of Rho1p are independent of each other. The colocalization of Rho1p with actin patches at the site of bud emergence and the role of Rho1p in cell wall synthesis emphasize the importance of Rho1p in polarized growth and morphogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Drgonova, J -- Drgon, T -- Tanaka, K -- Kollar, R -- Chen, G C -- Ford, R A -- Chan, C S -- Takai, Y -- Cabib, E -- New York, N.Y. -- Science. 1996 Apr 12;272(5259):277-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory od Biochemistry and Metabolism, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8602514" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Polarity ; Cell Wall/metabolism ; GTP Phosphohydrolases/*metabolism ; GTP-Binding Proteins/genetics/*metabolism ; Glucans/biosynthesis ; Glucosyltransferases/*metabolism ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Guanosine Triphosphate/metabolism ; *Membrane Proteins ; Morphogenesis ; Mutation ; Protein Kinase C/metabolism ; Recombinant Proteins/pharmacology ; Saccharomyces cerevisiae/cytology/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae Proteins ; *Schizosaccharomyces pombe Proteins ; Temperature ; *beta-Glucans ; *rho GTP-Binding Proteins
    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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    Optical imaging of functional organization in the monkey inferotemporal cortex (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-06-14
    Description: To investigate the functional organization of object recognition, the technique of optical imaging was applied to the primate inferotemporal cortex, which is thought to be essential for object recognition. The features critical for the activation of single cells were first determined in unit recordings with electrodes. In the subsequent optical imaging, presentation of the critical features activated patchy regions around 0.5 millimeters in diameter, covering the site of the electrode penetration at which the critical feature had been determined. Because signals in optical imaging reflect average neuronal activities in the regions, the result directly indicates the regional clustering of cells responding to similar features.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, G -- Tanaka, K -- Tanifuji, M -- New York, N.Y. -- Science. 1996 Jun 14;272(5268):1665-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Neural Information Processing, Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), Kagoshima University, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8658144" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Diagnostic Imaging ; Electrodes ; Face ; Humans ; Macaca ; Neurons/physiology ; Photic Stimulation ; Temporal Lobe/cytology/*physiology ; Visual Perception/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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  • 10
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    Two different pathways for D -xylose metabolism and the effect of xylose concentration on the yield coefficient of L -lactate in mixed-acid fermentation by the lactic acid bacterium Lactococcus lactis IO-1 (2002)
    Springer
    Details
    Publication Date: 2002-10-01
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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