The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Paras N Prasad - One of the best experts on this subject based on the ideXlab platform.
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Photopatterning hybrid sol–gel glass materials prepared from ethylene tellurate and alkoxysilane
Journal of Non-crystalline Solids, 2005Co-Authors: James M. O’reilly, Thomas W. Smith, Paras N PrasadAbstract:Abstract Photopatterning of sol–gels is a versatile technique that has been used to prepare optical components and devices of silica and titania. Telluria (TeO2) has a higher third-order non-linearity than silica and titania and offers advantages in optical devices. Ethylene tellurate was used as a high purity precursor in the preparation of nanoparticulate tellurium dioxide powders and glassy films by sol–gel processes. Powder and film samples were characterized by XRD, SEM and FTIR. The refractive index of the sol–gel derived Telluria film was 1.67. [3-(Methacryloloxypropyl)]trimethoxysilane (MPTMS) was incorporated into ethylene tellurate sol–gels in order to allow photopatterning by polymerization and cross-linking of methacrylate functionality. UV exposure of films with a photomask was used to produce line patterns. FTIR measurements showed the disappearance of acrylate double bonds in MPTMS, indicating the polymerization and condensation of the films.
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Photopatterning hybrid sol-gel glass materials prepared from ethylene tellurate and alkoxysilane
Journal of Non-Crystalline Solids, 2005Co-Authors: Jia Liu, James M. O'reilly, Thomas W. Smith, Paras N PrasadAbstract:Photopatterning of sol-gels is a versatile technique that has been used to prepare optical components and devices of silica and titania. Telluria (TeO2) has a higher third-order non-linearity than silica and titania and offers advantages in optical devices. Ethylene tellurate was used as a high purity precursor in the preparation of nanoparticulate tellurium dioxide powders and glassy films by sol-gel processes. Powder and film samples were characterized by XRD, SEM and FTIR. The refractive index of the sol-gel derived Telluria film was 1.67. [3-(Methacryloloxypropyl)]trimethoxysilane (MPTMS) was incorporated into ethylene tellurate sol-gels in order to allow photopatterning by polymerization and cross-linking of methacrylate functionality. UV exposure of films with a photomask was used to produce line patterns. FTIR measurements showed the disappearance of acrylate double bonds in MPTMS, indicating the polymerization and condensation of the films. © 2005 Elsevier B.V. All rights reserved.
Erko Stackebrandt - One of the best experts on this subject based on the ideXlab platform.
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Telluria mixta pseudomonas mixta bowman sly and hayward 1988 gen nov comb nov and Telluria chitinolytica sp nov soil dwelling organisms which actively degrade polysaccharides
International Journal of Systematic and Evolutionary Microbiology, 1993Co-Authors: J P Bowman, A C Hayward, Y Spiegel, Erko StackebrandtAbstract:Pseudomonas mixta (type strain, ACM 1762 [=ATCC 49108], an actively dextranolytic species that possesses both lateral and polar flagella, was compared with the strictly aerobic, rod-shaped, chitinolytic bacterium “Pseudomonas chitinolytica” ACM 3522T (= CNCM I-804) (T = type strain), which has a similar flagellation pattern, by performing phenotypic characterization and DNA-DNA hybridization studies and by analyzing DNA base compositions and 16S rRNA sequences. Our results indicated that “P. chitinolytica” ACM 3522T was phenotypically and genotypically distinct from P. mixta and other phenotypically analogous Pseudomonas spp., Xanthomonas maltophilia, and other aerobic chitin degraders. The 16S rRNA sequences of strains ACM 1762T and ACM 3522T were found to be very similar (97%) to each other and indicated that these organisms are proteobacteria that belong to the s subclass. The strains were deeply branched in the s subclass and were distinct from other pseudomonads, including Pseudomonas cepacia, and from Comamonas testosteroni. On the basis of phenotypic, genotypic, and phylogenetic evidence, it is proposed that P. mixta and “P. chitinolytica” ACM 3522T represent two distinct species in a new genus called Telluria. Thus, the genus Telluria gen. nov. contains Telluria mixta comb. nov. and Telluria chitinolytica sp. nov., which are strictly aerobic, rod-shaped, soil-dwelling bacteria that are active polysaccharide degraders.
Hans-jürgen Busse - One of the best experts on this subject based on the ideXlab platform.
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Undibacterium pigrum gen. nov., sp. nov., isolated from drinking water.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Peter Kämpfer, Ramon Rosselló-móra, Malte Hermansson, Frank Persson, Birgit Huber, Enevold Falsen, Hans-jürgen BusseAbstract:Two Gram-negative, rod-shaped, oxidase-positive, non-spore-forming, non-motile bacteria (strains CCUG 49009(T) and CCUG 49012), both isolated from drinking water, were characterized. On the basis of chemotaxonomic data [major ubiquinone, Q-8; predominant polyamines, putrescine and 2-hydroxyputrescine; major polar lipids, phosphatidylethanolamine, moderate amounts of diphosphatidylglycerol and phosphatidylglycerol and minor amounts of three aminolipids and phosphatidylserine; major fatty acids, C(16 : 0) and summed feature 3 (C(16 : 1) omega 7c/C(15 : 0) iso 2-OH)] and 16S rRNA gene sequence similarities, both strains clearly belong to the family Oxalobacteraceae of the Betaproteobacteria. 16S rRNA gene sequence similarities with members of the most closely related genera of this group (Herminiimonas, Massilia, Duganella, Telluria, Herbaspirillum, Janthinobacterium, Naxibacter and Paucimonas) were less than 96.5 % for both strains. The two strains also shared a relatively low 16S rRNA gene sequence similarity (96.8 %). Although phylogenetic analysis based on 16S rRNA gene sequence similarities clearly showed that the two organisms formed a separate branch, their phenotypes (including chemotaxonomic features) were hardly distinguishable and showed high similarities to those reported for the most closely related genera. On the basis of DNA-DNA hybridization results, the two strains were shown to represent separate species (sharing only 20 % DNA-DNA relatedness), but they could not be clearly differentiated phenotypically from each other. It is evident that these organisms represent a new genus, Undibacterium gen. nov., with one species, Undibacterium pigrum sp. nov. The type strain of Undibacterium pigrum is strain CCUG 49009(T) (=CIP 109318(T)). Strain CCUG 49012 (=CIP 108976) probably represents a second species of this genus, but is described here as a second genomovar of this species because of the lack of differentiating characters.
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Undibacterium pigrum gen. nov., sp. nov., isolated from drinking water
International Journal of Systematic and Evolutionary Microbiology, 2007Co-Authors: Peter Kämpfer, Ramon Rosselló-móra, Malte Hermansson, Frank Persson, Birgit Huber, Enevold Falsen, Hans-jürgen BusseAbstract:Two Gram-negative, rod-shaped, oxidase-positive, non-spore-forming, non-motile bacteria (strains CCUG 49009T and CCUG 49012), both isolated from drinking water, were characterized. On the basis of chemotaxonomic data [major ubiquinone, Q-8; predominant polyamines, putrescine and 2-hydroxyputrescine; major polar lipids, phosphatidylethanolamine, moderate amounts of diphosphatidylglycerol and phosphatidylglycerol and minor amounts of three aminolipids and phosphatidylserine; major fatty acids, C16 : 0 and summed feature 3 (C16 : 1 ω7c/C15 : 0 iso 2-OH)] and 16S rRNA gene sequence similarities, both strains clearly belong to the family Oxalobacteraceae of the Betaproteobacteria. 16S rRNA gene sequence similarities with members of the most closely related genera of this group (Herminiimonas, Massilia, Duganella, Telluria, Herbaspirillum, Janthinobacterium, Naxibacter and Paucimonas) were less than 96.5 % for both strains. The two strains also shared a relatively low 16S rRNA gene sequence similarity (96.8 %). Although phylogenetic analysis based on 16S rRNA gene sequence similarities clearly showed that the two organisms formed a separate branch, their phenotypes (including chemotaxonomic features) were hardly distinguishable and showed high similarities to those reported for the most closely related genera. On the basis of DNA–DNA hybridization results, the two strains were shown to represent separate species (sharing only 20 % DNA–DNA relatedness), but they could not be clearly differentiated phenotypically from each other. It is evident that these organisms represent a new genus, Undibacterium gen. nov., with one species, Undibacterium pigrum sp. nov. The type strain of Undibacterium pigrum is strain CCUG 49009T (=CIP 109318T). Strain CCUG 49012 (=CIP 108976) probably represents a second species of this genus, but is described here as a second genomovar of this species because of the lack of differentiating characters.
Oliver Röhl - One of the best experts on this subject based on the ideXlab platform.
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Yeast diversity and species recovery rates from beech forest soils
Mycological Progress, 2016Co-Authors: Andrey M. Yurkov, Thorsten Wehde, Julian Federici, Angela M. Schäfer, Malte Ebinghaus, Sascha Lotze-engelhard, Moritz Mittelbach, René Prior, Christian Richter, Oliver RöhlAbstract:Soil yeasts are globally diverse. They are found in almost all soil types, and the structure of soil yeast communities reflects aboveground vegetation properties. Cultivation techniques have often been successfully employed to study yeasts in forest soils. However, few studies have addressed the variation of soil yeast communities in space and time; especially, structural dynamics at a forest site between different seasons is unknown. Here, we analyse the results from our field experiments performed in 2008 and 2009. We reassess species inventory data and identify potential new species. Using improved species lists, we estimate the rate of species recovery from beech forest soils with a particular focus on repeated sampling. Our analyses showed that the number of observed yeast species was steadily increasing after one, two and three samplings. The observed diversity was likely approaching saturation after four samplings. Additionally, we provide formal descriptions of new yeast species isolated from forest soils in Germany during these studies, as 30 % of the observed species represented undescribed taxa. The following taxonomic novelties are proposed: Colacogloea demeterae Yurkov, Schäfer & Begerow sp. nov. (MB 816166), Slooffia velesii Federici, Röhl & Begerow sp. nov. (MB 816165), Hamamotoa cerberi Yurkov, Schäfer & Begerow sp. nov. (MB 816164), Hamamotoa telluris Yurkov, Schäfer & Begerow sp. nov. (MB 816163), Piskurozyma yama Richter, Mittelbach & Begerow, sp. nov. (MB 816162), Piskurozyma tuonelana Lotze-Engelhard, Richter & Begerow sp. nov. (MB 816161), Dioszegia dumuzii Ebinghaus, Prior & Begerow sp. nov. (MB 816160), and Chernovia houtui Federici, Yurkov & Begerow gen. nov. et sp. nov. (MB 816158, MB 816159).
J P Bowman - One of the best experts on this subject based on the ideXlab platform.
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Telluria mixta pseudomonas mixta bowman sly and hayward 1988 gen nov comb nov and Telluria chitinolytica sp nov soil dwelling organisms which actively degrade polysaccharides
International Journal of Systematic and Evolutionary Microbiology, 1993Co-Authors: J P Bowman, A C Hayward, Y Spiegel, Erko StackebrandtAbstract:Pseudomonas mixta (type strain, ACM 1762 [=ATCC 49108], an actively dextranolytic species that possesses both lateral and polar flagella, was compared with the strictly aerobic, rod-shaped, chitinolytic bacterium “Pseudomonas chitinolytica” ACM 3522T (= CNCM I-804) (T = type strain), which has a similar flagellation pattern, by performing phenotypic characterization and DNA-DNA hybridization studies and by analyzing DNA base compositions and 16S rRNA sequences. Our results indicated that “P. chitinolytica” ACM 3522T was phenotypically and genotypically distinct from P. mixta and other phenotypically analogous Pseudomonas spp., Xanthomonas maltophilia, and other aerobic chitin degraders. The 16S rRNA sequences of strains ACM 1762T and ACM 3522T were found to be very similar (97%) to each other and indicated that these organisms are proteobacteria that belong to the s subclass. The strains were deeply branched in the s subclass and were distinct from other pseudomonads, including Pseudomonas cepacia, and from Comamonas testosteroni. On the basis of phenotypic, genotypic, and phylogenetic evidence, it is proposed that P. mixta and “P. chitinolytica” ACM 3522T represent two distinct species in a new genus called Telluria. Thus, the genus Telluria gen. nov. contains Telluria mixta comb. nov. and Telluria chitinolytica sp. nov., which are strictly aerobic, rod-shaped, soil-dwelling bacteria that are active polysaccharide degraders.
