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  • 1
    Publication Date: 2001
    Keywords: paleo ; Seismology ; Geol. aspects ; 7221 ; Seismology ; Paleoseismology ; 1829 ; Hydrology ; Groundwater ; hydrology ; 7294 ; Instruments ; and ; techniques
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  • 2
    Publication Date: 2010-05-21
    Description: Commensal bacteria are known to inhibit pathogen colonization; however, complex host-microbe and microbe-microbe interactions have made it difficult to gain a detailed understanding of the mechanisms involved in the inhibition of colonization. Here we show that the serine protease Esp secreted by a subset of Staphylococcus epidermidis, a commensal bacterium, inhibits biofilm formation and nasal colonization by Staphylococcus aureus, a human pathogen. Epidemiological studies have demonstrated that the presence of Esp-secreting S. epidermidis in the nasal cavities of human volunteers correlates with the absence of S. aureus. Purified Esp inhibits biofilm formation and destroys pre-existing S. aureus biofilms. Furthermore, Esp enhances the susceptibility of S. aureus in biofilms to immune system components. In vivo studies have shown that Esp-secreting S. epidermidis eliminates S. aureus nasal colonization. These findings indicate that Esp hinders S. aureus colonization in vivo through a novel mechanism of bacterial interference, which could lead to the development of novel therapeutics to prevent S. aureus colonization and infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Iwase, Tadayuki -- Uehara, Yoshio -- Shinji, Hitomi -- Tajima, Akiko -- Seo, Hiromi -- Takada, Koji -- Agata, Toshihiko -- Mizunoe, Yoshimitsu -- England -- Nature. 2010 May 20;465(7296):346-9. doi: 10.1038/nature09074.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, The Jikei University School of Medicine, Tokyo, 105-8461 Japan. iwase.tadayuki@jikei.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20485435" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/chemistry/isolation & purification/*metabolism/pharmacology ; Biofilms/*growth & development ; Female ; Humans ; Male ; Nose/*microbiology ; Odds Ratio ; Serine Proteases/chemistry/deficiency/isolation & purification/*metabolism ; Staphylococcal Infections/microbiology/prevention & control/therapy ; Staphylococcus aureus/*growth & development/immunology ; Staphylococcus epidermidis/*enzymology/genetics/*physiology ; Superinfection/immunology/microbiology/prevention & control/therapy ; Young Adult ; beta-Defensins/immunology/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2014-01-31
    Description: Cultivated bacteria such as actinomycetes are a highly useful source of biomedically important natural products. However, such 'talented' producers represent only a minute fraction of the entire, mostly uncultivated, prokaryotic diversity. The uncultured majority is generally perceived as a large, untapped resource of new drug candidates, but so far it is unknown whether taxa containing talented bacteria indeed exist. Here we report the single-cell- and metagenomics-based discovery of such producers. Two phylotypes of the candidate genus 'Entotheonella' with genomes of greater than 9 megabases and multiple, distinct biosynthetic gene clusters co-inhabit the chemically and microbially rich marine sponge Theonella swinhoei. Almost all bioactive polyketides and peptides known from this animal were attributed to a single phylotype. 'Entotheonella' spp. are widely distributed in sponges and belong to an environmental taxon proposed here as candidate phylum 'Tectomicrobia'. The pronounced bioactivities and chemical uniqueness of 'Entotheonella' compounds provide significant opportunities for ecological studies and drug discovery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, Micheal C -- Mori, Tetsushi -- Ruckert, Christian -- Uria, Agustinus R -- Helf, Maximilian J -- Takada, Kentaro -- Gernert, Christine -- Steffens, Ursula A E -- Heycke, Nina -- Schmitt, Susanne -- Rinke, Christian -- Helfrich, Eric J N -- Brachmann, Alexander O -- Gurgui, Cristian -- Wakimoto, Toshiyuki -- Kracht, Matthias -- Crusemann, Max -- Hentschel, Ute -- Abe, Ikuro -- Matsunaga, Shigeki -- Kalinowski, Jorn -- Takeyama, Haruko -- Piel, Jorn -- England -- Nature. 2014 Feb 6;506(7486):58-62. doi: 10.1038/nature12959. Epub 2014 Jan 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Institute of Microbiology, Eidgenossische Technische Hochschule Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland [2] Kekule Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany [3]. ; 1] Faculty of Science and Engineering, Waseda University Center for Advanced Biomedical Sciences, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan [2]. ; Institute for Genome Research and Systems Biology, Center for Biotechnology, Universitat Bielefeld, Universitatstrasse 25, 33594 Bielefeld, Germany. ; 1] Institute of Microbiology, Eidgenossische Technische Hochschule Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland [2] Kekule Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany. ; Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan. ; Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Wurzburg, Julius-von-Sachs-Platz 3, 97082 Wurzburg, Germany. ; Kekule Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany. ; Department of Earth and Environmental Sciences, Palaeontology and Geobiology, Ludwig Maximilians University Munich, Richard-Wagner-Strasse 10, 80333 Munich, Germany. ; Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, California 94598, USA. ; Institute of Microbiology, Eidgenossische Technische Hochschule Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, Switzerland. ; Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. ; Faculty of Science and Engineering, Waseda University Center for Advanced Biomedical Sciences, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24476823" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biosynthetic Pathways/genetics ; Deltaproteobacteria/*classification/genetics/*metabolism/physiology ; *Drug Discovery ; Environmental Microbiology ; Genes, Bacterial/genetics ; Genome, Bacterial/genetics ; Metagenomics ; Molecular Sequence Data ; Multigene Family/genetics ; Peptides/metabolism ; Polyketides/metabolism ; Porifera/metabolism/microbiology ; Single-Cell Analysis ; Symbiosis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2013-03-30
    Description: X-ray single-crystal diffraction (SCD) analysis has the intrinsic limitation that the target molecules must be obtained as single crystals. Here we report a protocol for SCD analysis that does not require the crystallization of the sample. In our method, tiny crystals of porous complexes are soaked in a solution of the target, such that the complexes can absorb the target molecules. Crystallographic analysis clearly determines the absorbed guest structures along with the host frameworks. Because the SCD analysis is carried out on only one tiny crystal of the complex, the required sample mass is of the nanogram-microgram order. We demonstrate that as little as about 80 nanograms of a sample is enough for the SCD analysis. In combination with high-performance liquid chromatography, our protocol allows the direct characterization of multiple fractions, establishing a prototypical means of liquid chromatography SCD analysis. Furthermore, we unambiguously determined the structure of a scarce marine natural product using only 5 micrograms of the compound.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Inokuma, Yasuhide -- Yoshioka, Shota -- Ariyoshi, Junko -- Arai, Tatsuhiko -- Hitora, Yuki -- Takada, Kentaro -- Matsunaga, Shigeki -- Rissanen, Kari -- Fujita, Makoto -- England -- Nature. 2013 Mar 28;495(7442):461-6. doi: 10.1038/nature11990.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23538828" target="_blank"〉PubMed〈/a〉
    Keywords: Absorption ; Alkynes/chemistry ; Analytic Sample Preparation Methods/*methods ; Animals ; Biological Products/chemistry ; Crystallization/*methods ; Crystallography, X-Ray/*methods ; Fatty Alcohols/chemistry ; Microchemistry/*methods ; Nanotechnology/*methods ; Porifera/chemistry ; Porosity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2012-12-06
    Description: Glycolipid and transporter protein gene expression in ovarian serous carcinoma-derived 2008 cells, and their paclitaxel-resistant Px2 and cisplatin-resistant C13 forms was examined to confirm the previous finding, i.e., that it was characteristically altered in anticancer drug-resistant cells established on continuous cultivation of ovarian carcinoma-derived KF28 cells in the different anticancer drug-containing media. Although the concentrations of lipid constituents in 2008 cells were higher than those in KF28 cells, and the glycolipid compositions were different, the following glycolipids and genes were commonly altered in KF28- and 2008-derived resistant cells. Gb 3 Cer was increased in all resistant cells, irrespective of whether the resistance was to paclitaxel or cisplatin, and expression of the MDR1 gene and gangliosides was enhanced in paclitaxel-resistant cells, but gangliosides were absent in cisplatin-resistant cells. In accord with the decreased amounts of gangliosides in cisplatin-resistant cells, the gene expression and specific activity of GM3 synthase were greatly decreased in cisplatin-resistant cells. Furthermore, paclitaxel- and cisplatin-resistant cells were converted to forms more sensitive to the respective anticancer drugs on cultivation with D-PDMP, an inhibitor of GlcCer synthase, and GM3, respectively, prior to the addition of anticancer drugs, indicating the possible involvement of glycolipids in anticancer drug resistance.
    Print ISSN: 0021-924X
    Electronic ISSN: 1756-2651
    Topics: Biology , Chemistry and Pharmacology
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2224-2229 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: UV light irradiation effects on prebaking and silicon epitaxial growth is studied. An ArF excimer laser, a KrF excimer laser, and a Hg-Xe lamp are used as light sources. The epitaxial growth is carried out using a SiH2Cl2/H2 system under reduced pressure. ArF radiation and Hg-Xe radiation are found to be effective for volatilizing native SiO2 on silicon-substrate surfaces even at low temperatures. When a substrate surface is irradiated with these UV radiations during prebaking and epitaxial growth, epilayer surface morphology and crystalline quality are much improved. Furthermore, the epitaxial growth rate seems to be enhanced photothermally by excimer laser radiations, and photochemically by Hg-Xe radiation.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2483-2485 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter shows theoretically and experimentally that Fresnel end reflection of the waveguide under test degrades the sensitivity of low coherence optical time domain reflectometry (OTDR). Optical mixing of end reflection and reference light in the OTDR produces the phase noise in proportion to end reflectivity. With the balanced detection technique, the excess photon noise is subdued and the phase noise becomes the dominant source of sensitivity degradation. At 3.2% end reflection and 300 μA mean photocurrent, the noise floor due to the phase noise is −138 dB/Hz. By reducing the fiber end reflection with matching oil, a shot-noise limited sensitivity of −140 dB at a 3 Hz bandwidth has been demonstrated at submillimeter resolution.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Fukuyama type congenital muscular dystrophy (FCMD) is an autosomal recessive severe muscular dystrophy associated with an anomaly of the brain. Twenty–one FCMD families, 13 of them with consanguineous marriages, were analysed by genetic linkage analyses with polymorphic microsatellite markers ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 666 (1981), S. 307-312 
    ISSN: 0005-2760
    Keywords: (Rat skin) ; 7-Dehydrocholesterol ; Fatty acid ester ; HPLC ; Ultraviolet irradiation ; Vitamin D"3
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 666 (1981), S. 356-360 
    ISSN: 0005-2760
    Keywords: (Rat skin) ; 7-Dehydrocholesterol ; Tachysterol"3 ; Ultraviolet radiation ; Vitamin D"3
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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