Kooperativer Bibliotheksverbund

Berlin Brandenburg


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  • 1
    In: The ISME Journal, 2017
    Description: Acquisition of additional photosynthetic pigments enables photosynthetic organisms to survive in particular niches. To reveal the ecological significance of chlorophyll (Chl) f, we investigated the distribution of Chl and cyanobacteria within two microbial mats. In a 7-mm-thick microbial mat beneath the running water of the Nakabusa hot spring, Japan, Chl f was only distributed 4.0-6.5 mm below the surface, where the intensity of far-red light (FR) was higher than that of photosynthetically active radiation (PAR). In the same mat, two ecotypes of Synechococcus and two ecotypes of Chl f-producing Leptolyngbya were detected in the upper and deeper layers, respectively. Only the Leptolyngbya strains could grow when FR was the sole light source. These results suggest that the deeper layer of the microbial mat was a habitat for Chl f-producing cyanobacteria, and Chl f enabled them to survive in a habitat with little PAR.
    Keywords: Chlorophyll -- Analogs & Derivatives ; Cyanobacteria -- Isolation & Purification ; Hot Springs -- Microbiology;
    ISSN: 1751-7362
    E-ISSN: 1751-7370
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  • 2
    Language: English
    In: Water Research, 01 May 2016, Vol.94, pp.120-127
    Description: Global warming and urbanization together with development of subsurface infrastructures (e.g. subways, shopping complexes, sewage systems, and Ground Source Heat Pump (GSHP) systems) will likely cause a rapid increase in the temperature of relatively shallow groundwater reservoirs (subsurface thermal pollution). However, potential effects of a subsurface temperature change on groundwater quality due to changed physical, chemical, and microbial processes have received little attention. We therefore investigated changes in 34 groundwater quality parameters during a 13-month enhanced-heating period, followed by 14 months of natural or enhanced cooling in a confined marine aquifer at around 17 m depth on the Saitama University campus, Japan. A full-scale GSHP test facility consisting of a 50 m deep U-tube for circulating the heat-carrying fluid and four monitoring wells at 1, 2, 5, and 10 m from the U-tube were installed, and groundwater quality was monitored every 1–2 weeks. Rapid changes in the groundwater level in the area, especially during the summer, prevented accurate analyses of temperature effects using a single-well time series. Instead, Dual-Well Analysis (DWA) was applied, comparing variations in subsurface temperature and groundwater chemical concentrations between the thermally-disturbed well and a non-affected reference well. Using the 1 m distant well (temperature increase up to 7 °C) and the 10 m distant well (non-temperature-affected), the DWA showed an approximately linear relationships for eight components (B, Si, Li, dissolved organic carbon (DOC), Mg , NH , Na , and K ) during the combined 27 months of heating and cooling, suggesting changes in concentration between 4% and 31% for a temperature change of 7 °C.
    Keywords: Subsurface Thermal Pollution ; Ground Source Heat Pump (Gshp) Systems ; Long-Term Heating and Cooling ; Confined Marine Aquifer ; Dual-Well Analysis (Dwa) ; Groundwater Quality ; Engineering
    ISSN: 0043-1354
    E-ISSN: 1879-2448
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  • 3
    Language: English
    In: Microbes and environments, 2012, Vol.27(3), pp.217-25
    Description: Acaryochloris spp. are unique cyanobacteria which contain chlorophyll d as the predominant pigment. The phylogenetic diversity of Acaryochloris spp. associated with 7 Prochloron- or Synechocystis-containing didemnid ascidians and 1 Synechococcus-containing sponge obtained from the coast of the Republic of Palau was analyzed; we established a PCR primer set designed to selectively amplify the partial 16S rRNA gene of Acaryochloris spp. even in DNA samples containing a large amount of other cyanobacterial and algal DNAs. Polymerase chain reaction-denaturing gradient gel electrophoresis with this primer set enabled detection of the phyogenetic diversity of Acaryochloris spp. All the ascidian and sponge samples contained Acaryochloris spp. Fourteen phylotypes that were highly homologous (98-100%) with A. marina MBIC11017 were detected, while only 2 phylotypes were detected with our previously developed method for detecting cyanobacteria. The results also revealed that many uncultured phylotypes of Acaryochloris spp. were associated with those didemnid ascidians, since a clonal culture of only 1 phylotype has been established thus far. No specific relationship was found among the Acaryochloris phylotypes and the genera of the ascidians even when sample localities were identical; therefore, these invertebrates may provide a favorable habitat for Acaryochloris spp. rather than hosts showing any specific symbiotic relationships.
    Keywords: Genetic Variation ; Phylogeny ; Cyanobacteria -- Classification ; Porifera -- Microbiology ; Urochordata -- Microbiology
    ISSN: 13426311
    E-ISSN: 1347-4405
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  • 4
    Language: Japanese
    In: 八戸工業高等専門学校紀要, 2013, Vol.48(0), pp.1-4
    ISSN: 0385-4124
    Source: Japan Science and Technology Agency
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  • 5
    In: FEMS Microbiology Ecology, 2012, Vol. 81(3), pp.696-706
    Description: The diversity of cyanobacterial species within the coralloid roots of an individual and populations of Cycas revoluta was investigated based on 16S rRNA gene sequences. Sixty-six coralloid roots were collected from nine natural populations of cycads on Kyushu and the Ryukyu Islands, covering the entire distribution range of the species. Approximately 400 bp of the 5′-end of 16S rRNA genes was amplified, and each was identified by denaturing gradient gel electrophoresis. Most coralloid roots harbored only one cyanobiont, Nostoc , whereas some contained two or three, representing cyanobiont diversity within a single coralloid root isolated from a natural habitat. Genotypes of Nostoc within a natural population were occasionally highly diverged and lacked DNA sequence similarity, implying genetic divergence of Nostoc . On the other hand, Nostoc genotypes showed no phylogeographic structure across the distribution range, while host cycads exhibited distinct north–south differentiation. Cycads may exist in symbiosis with either single or multiple Nostoc strains in natural soil habitats.
    Keywords: Coralloid Root ; Cycad ; 〈Kwd〉〈Italic〉Cycas Revoluta〈/Italic〉〈/Kwd〉 ; Dgge ; Genetic Diversity ; 〈Kwd〉〈Italic〉Nostoc〈/Italic〉〈/Kwd〉
    ISSN: 01686496
    E-ISSN: 1574-6941
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  • 6
    Language: English
    In: Algal Research, July 2013, Vol.2(3), pp.237-243
    Description: Four aerial microalgae were isolated from the surface of rocks in mountainous districts of Japan and identified as sp. KGU-Y002, sp. KGU-D002, and sp. KGU-H001 of the class Chlorophyceae and KGU-Y001 of the class Eustigmatophyceae based on 18S rDNA analysis. Algal carotenogenesis was enhanced by increasing the light intensity from 40 to 214 μmol photons m s , with more or less decrease in the total chlorophyll content. Culture of these microalgae under high-light conditions resulted in production of astaxanthin (free and esters), adonixanthin (free and esters), lutein, canthaxanthin, and β-carotene as the major carotenoids. Under high-light culture conditions, strains KGU-Y002, KGU-D002, KGU-H001, and KGU-Y001 accumulated 5.75, 10.45, 2.60, and 11.50 mg g dry weight cells (dwc) of total carotenoids when the total chlorophyll contents were 3.51, 5.88, 2.91, and 7.17 mg g dwc, respectively. The astaxanthin produced might primarily be synthesized from β-carotene via accumulation of zeaxanthin and adonixanthin in strains KGU-Y002, KGU-D002, and KGU-H001. Strain KGU-Y001 was found to accumulate astaxanthin and violaxanthin with large amounts of β-carotene. These results revealed that the biosynthesis pathways for astaxanthin in these isolates were significantly different from those of astaxanthin in green microalgae.
    Keywords: Aerial Microalgae ; Carotenoids ; High-Light Irradiance ; Chlorophyceae ; Eustigmatophyceae ; Botany
    ISSN: 2211-9264
    E-ISSN: 2211-9264
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  • 7
    Language: English
    In: Journal of the American Chemical Society, 09 February 2011, Vol.133(5), pp.1180-3
    Description: Autocatalytic formation of His-Cys cross-linkage in the enzyme active site of tyrosinase from Aspergillus oryzae has been demonstrated to proceed by the treatment of apoenzyme with Cu(II) under aerobic conditions, where a (μ-η(2):η(2)-peroxo)dicopper(II) species has been suggested to be involved as a key reactive intermediate.
    Keywords: Copper -- Chemistry ; Cysteine -- Chemistry ; Histidine -- Chemistry ; Monophenol Monooxygenase -- Chemistry ; Organometallic Compounds -- Pharmacology ; Protein Processing, Post-Translational -- Drug Effects
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 8
    Language: English
    In: Catalysis Surveys from Asia, Sept, 2010, Vol.14(3-4), p.164(4)
    Description: Byline: Tadahito Nobori (1), Takaomi Hayashi (1), Atsushi Shibahara (1), Takuya Saeki (1), Satoshi Yamasaki (1), Kazuhiko Ohkubo (1) Keywords: Phosphazene; Ring-opening polymerization reaction; Propylene oxide; Polypropylene glycol Abstract: This contribution reports development and an application of high-performance catalysts, phosphazene catalysts (PZN and PZO) with high reactivity and selectivity for ring-opening polymerization reactions of propylene oxides that provide highly advanced polypropylene glycols. The produced polypropylene glycols with high purity and narrow molecular weight distributions have been commercialized as raw materials for environmentally- and people-friendly polyurethane foams (for car sheet cushions). Author Affiliation: (1) R&D Center, Mitsui Chemicals, Inc, 580-32 Nagaura, Sodegaura, Chiba, 299-0265, Japan Article History: Registration Date: 17/05/2010 Online Date: 05/06/2010
    Keywords: Glycols (Class of compounds) ; Polymerization ; Polypropylene ; Catalysts
    ISSN: 1571-1013
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  • 9
    Language: English
    In: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology, Feb, 2013, Vol.15(2), p.1(8)
    Description: Byline: Toshiharu Moriya (1), Junichiro Kugai (1), Satoshi Seino (1), Yuji Ohkubo (1), Takashi Nakagawa (1), Hiroaki Nitani (2), Takao A. Yamamoto (1) Keywords: Pt--Cu; Bimetallic composite; Radiolytic synthesis; Preferential CO oxidation; PROX Abstract: Modification of supported Pt catalyst by transition metal is effective for improving catalytic performance in fuel processing and electrochemical processes. In order to identify the role of CuO in Pt--Cu bimetallic nanoparticle catalyst in CO preferential oxidation in H.sub.2-rich gas, three [I3-Fe.sub.2]O.sub.3-supported Pt--Cu catalyst samples consisting of Pt--Cu alloy with different CuO content were synthesized by a radiolytic process. By managing the concentrations of the copper source and oxygen dissolved in the precursor solution, the CuO content was successfully varied by an order of magnitude without changing the structure and composition of the Pt--Cu alloy. In the catalytic tests, CuO-promoted CO oxidation significantly at around 100 degC. The catalyst with the highest CuO content showed the highest CO and O.sub.2 conversions. It was considered that the CuO phase promotes oxygen supply to CO chemisorbed on the Pt--Cu alloy surface. The alloy-CuO contact was suggested to be critical for the promoting effect. Author Affiliation: (1) Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan (2) Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan Article History: Registration Date: 18/01/2013 Received Date: 06/11/2012 Accepted Date: 18/01/2013 Online Date: 29/01/2013
    Keywords: Copper Oxides ; Alloys ; Nuclear Radiation ; Electrochemistry ; Oxidation-reduction Reactions
    ISSN: 1388-0764
    Source: Cengage Learning, Inc.
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  • 10
    In: Applied and Environmental Microbiology, 2006, Vol. 72(12), p.7912
    Description: A molecular method for detecting the epiphyte community on marine macroalgae was developed by using PCR-denaturing gradient gel electrophoresis. Selective amplification of 16S rRNA gene fragments from either cyanobacteria or algal plastids improved the detection of minor epiphytes. Two phylotypes of Acaryochloris, a chlorophyll d-containing cyanobacterium, were found not only on red macroalgae but also on green and brown macroalgae.
    Keywords: Engineering ; Biology ; Economics;
    ISSN: 0099-2240
    ISSN: 00992240
    E-ISSN: 10985336
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