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Stephanie A Carr, Florence Schubotz, Robert B Dunbar, Christopher T Mills, Robert Dias, Roger E Summons, Kevin W Mandernack
Despite accounting for the majority of sedimentary methane, the physiology and relative abundance of subsurface methanogens remain poorly understood. We combined intact polar lipid and metagenome techniques to better constrain the presence and functions of methanogens within the highly reducing, organic-rich sediments of Antarctica's Adélie Basin. The assembly of metagenomic sequence data identified phylogenic and functional marker genes of methanogens and generated the first Methanosaeta sp. genome from a deep subsurface sedimentary environment...
October 17, 2017: ISME Journal
Qi Liang Lu, Qi Quan Luo, Yi De Li, Shou Guo Huang
An optimization strategy combining a global semi-empirical quantum mechanical search and all-electron density functional theory was adopted to determine the lowest energy structures of B19Si and B19C clusters. The planarization of a B20 cluster by Si and C atom substitution was observed. The structural transition was from the double-ring tubular B20 to an almost perfect planar B19Si and a quasi-planar bowl B19C. B19Si possessed a geometry with a central B atom surrounded by a six-membered ring and a 13-atom outer ring...
October 17, 2017: Physical Chemistry Chemical Physics: PCCP
Agnès B Jousset, Laura Dabos, Rémy A Bonnin, Delphine Girlich, Anaïs Potron, Nicolas Cabanel, Laurent Dortet, Philippe Glaser, Thierry Naas
Shewanella spp. constitute a reservoir of antibiotic resistance determinants. In a bile sample, we have identified three Extended Spectrum β-lactamase (ESBL)-producing bacteria (Escherichia coli, Klebsiella pneumoniae and Shewanella sp. JAB-1) isolated from a child suffering from cholangitis. Our objectives were to characterize the genome and the resistome of the first ESBL-producing isolate of the genus Shewanella and determine whether plasmidic exchange occurred between the three-bacterial species. Bacterial isolates were characterized using MALDI-TOF, standard biochemical tools and antimicrobial susceptibility testing...
October 16, 2017: Antimicrobial Agents and Chemotherapy
Ziqing Gao, Chenglin Su, Xueying Yang, Di Sun, Chao Zeng, Ming Chen, Wenzhong Hu, Chunzhi Zhang
A novel bacterium, designated strain DL503(T), was isolated from a Daqu sample and its taxonomic position determined using a polyphasic taxonomy. Strain DL503(T) was a Gram-stain-negative, facultatively anaerobic, non-sporulating, motile and coccoid-rod-shaped bacterium. Optimum growth occurred at 20-45 °C, pH 5.0-10.0 and 1.5 % (w/v) NaCl. Comparative analysis of the 16S rRNA gene sequence showed that the isolate belongs to the genus Franconibacter, showing highest levels of similarity with respect to Franconibacter pulveris JCM 16471(T) (98...
October 16, 2017: International Journal of Systematic and Evolutionary Microbiology
Wei Qin, Katherine R Heal, Rasika Ramdasi, Julia N Kobelt, Willm Martens-Habbena, Anthony D Bertagnolli, Shady A Amin, Christopher B Walker, Hidetoshi Urakawa, Martin Könneke, Allan H Devol, James W Moffett, E Virginia Armbrust, Grant J Jensen, Anitra E Ingalls, David A Stahl
Four mesophilic, neutrophilic, and aerobic marine ammonia-oxidizing archaea, designated strains SCM1(T), HCA1(T), HCE1(T) and PS0(T), were isolated from a tropical marine fish tank, dimly lit deep coastal waters, the lower euphotic zone of coastal waters, and near-surface sediment in the Puget Sound estuary, respectively. Cells are straight or slightly curved small rods, 0.15-0.26 µm in diameter and 0.50-1.59 µm in length. Motility was not observed, although strain PS0(T) possesses genes associated with archaeal flagella and chemotaxis, suggesting it may be motile under some conditions...
October 16, 2017: International Journal of Systematic and Evolutionary Microbiology
Ling Li, Chen Yang, Xiuliang Feng, Yongping Du, Zhihong Zhang, Yueping Zhang
AIM: This study aimed to study the effects of intratracheal instillation of budesonide on lung maturity of premature fetal rabbits. The developmental pattern of pulmonary alveoli in rabbits is similar to that in humans. METHOD: Fetal rabbits were taken out from female rabbits on the 28th day of pregnancy (full term = 31 days) by cesarean section (c-section). The fetal rabbits were divided into four groups: control (normal saline, NS), budesonide (budesonide, BUD), calf pulmonary surfactant for injection (pulmonary surfactant, PS), and calf pulmonary surfactant + budesonide for injection (pulmonary surfactant + budesonide, PS + BUD)...
October 13, 2017: Pediatric Pulmonology
Laura M Cox, Jiho Sohn, Kerin L Tyrrell, Diane M Citron, Paul A Lawson, Nisha B Patel, Tadasu Iizumi, Guillermo I Perez-Perez, Ellie J C Goldstein, Martin J Blaser
No abstract text is available yet for this article.
October 2017: International Journal of Systematic and Evolutionary Microbiology
Chenjia Guo, Ping Wu, Jinghua Xue, Hanxiang Li, Xiaoyi Wei
Two new γ-pyrones, xylaropyrones B (1) and C (2), together with three known compounds, xylaropyrone (3), annularin A (4) and annularin C (5), were isolated from solid cultures of the endophytic fungus Xylaria sp. SC1440. The structures of these compounds were determined mainly by analysis of their NMR spectroscopic data. The relative configurations of 1 and 2 were assigned on the basis of J-based configurational analysis, and the absolute configurations were established by experimental and TDDFT calculated ECD spectra...
October 12, 2017: Natural Product Research
Joshua W Campbell, Cherice Smithers, Allyn Irvin, Chase B Kimmel, Cory Stanley-Stahr, Jaret C Daniels, James D Ellis
Wildflower strip plantings in intensive agricultural systems have become a widespread tool for promoting pollination services and biological conservation because of their use by wasps and bees. Many of the trap-nesting wasps are important predators of common crop pests, and cavity-nesting bees that utilize trap-nests are important pollinators for native plants and many crops. The impact of wildflower strips on the nesting frequency of trap-nesting wasps or bees within localized areas has not been thoroughly investigated...
October 10, 2017: Insects
Jing Wang, Shuo Chen, Xie Quan, Hongtao Yu
Metal-free carbon materials have been presented to be potential alternatives to metal-based catalysts for heterogeneous catalytic ozonation, yet the catalytic performance still needs to be enhanced. Doping carbon with non-metallic heteroatoms (e.g., N, B, and F) could alter the electronic structure and electrochemical properties of original carbon materials, has been considered to be an effective method for improving the catalytic activity of carbon materials. Herein, fluorine-doped carbon nanotubes (F-CNTs) were synthesized via a facile method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy...
September 27, 2017: Chemosphere
Katharina Frindte, Sarah A Maarastawi, André Lipski, Joachim Hamacher, Claudia Knief
Three gammaproteobacterial methanotrophic strains (73a(T), 175 and 114) were isolated from stems of rice plants. All strains are Gram-negative, motile and grow on methane or methanol as sole carbon sources. They oxidize methane using the particulate methane monooxygenase. Strains 114 and 175 possess additionally a soluble methane monooxygenase. All strains contain significant amounts of the cellular fatty acids C16 : 0, C16 : 1ω6c and C16 : 1ω7c, typical for type Ib methanotrophs. Characteristic for strains 114 and 175 are high amounts of C14 : 0 and C16 : 1ω6c , while strain 73a(T) contains high quantities of C16 : 1ω5c...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Alberto Enrique Paniz-Mondolfi, Alexander L Greninger, Lynn Ladutko, Barbara A Brown-Elliott, Ravikiran Vasireddy, Wesley Jakubiec, Sruthi Vasireddy, Richard J Wallace, Keith E Simmon, Bruce E Dunn, Gary Jackoway, Surabhi B Vora, Kevin K Quinn, Xuan Qin, Sheldon Campbell
A previously undescribed, rapidly growing, scotochromogenic species of the genus Mycobacterium (represented by strains PB739(T) and GK) was isolated from two clinical sources - the sputum of a 76-year-old patient with severe chronic obstructive pulmonary disease, history of tuberculosis exposure and Mycobacterium avium complex isolated years prior; and the blood of a 15-year-old male with B-cell acute lymphoblastic leukaemia status post bone marrow transplant. The isolates grew as dark orange colonies at 25-37 °C after 5 days, sharing features in common with other closely related species...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Yana Ryzhmanova, Victoria Oshurkova, Olga Troshina, Tatyana Abashina, Elena Ariskina, Alexander Avtukh, Viktoria Shcherbakova
An anaerobic alkaliphilic, proteolytic bacterium, strain Su22(T), was isolated from the bottom sediment of the alkaline low mineralization lake Sulphatnoe (Selenginsky district, Buryatia, Russia). A comparative analysis of the 16S rRNA gene sequence revealed that this bacterium was closely related to Anoxynatronum sibiricum Z-7981(T) with a similarity of 98.1 %. Strain Su22(T) differed from A. sibiricum Z-7981(T) in its inability to use carbohydrates, peptone and amino acids as carbon sources. Strain Su22(T) grew over a temperature range of 20-40 °C with an optimum at 30 °C and within the pH range 7...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Xing-Kui Zhou, Qing-Qing Li, Ming-He Mo, Yong-Guang Zhang, Li-Min Dong, Min Xiao, Wen-Jun Li, Yan-Qing Duan
A Gram-staining-negative, non-motile and rod-shaped bacterium, designated strain h337(T), was isolated from an arable soil sample of a tobacco field in Kunming, south-west China. The cells showed oxidase-positive and catalase-positive reactions. Growth was observed at 10-35 °C, at pH 6.0-9.0 and in the presence of up to 3 % (w/v) NaCl, with optimal growth at 30 °C, pH 7.0 and with 1-2 % (w/v) NaCl. The predominant isoprenoid quinone was MK-7. The major fatty acids were identified as iso-C15 : 0, iso-C17 : 0 3-OH, summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c) and summed feature 4 (iso-C17 : 1 I and/or anteiso-C17 : 1 B)...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Nadezhda V Agafonova, Elena N Kaparullina, Yuri A Trotsenko, Nina V Doronina
An aerobic facultatively methylotrophic bacterium was isolated from roots of Sonchus arvensis L. and designated strain Osot(T) The cells of this strain were Gram-stain-negative, asporogenous, motile short rods multiplying by binary fisson. They utilized methanol, methylamines and a variety of polycarbon compounds as the carbon and energy sources. Methanol was assimilated after sequential oxidation to formaldehyde and CO2 via the ribulose bisphosphate pathway. The organism grew optimally at 22-29 °C and pH7...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Hai-Zhen Zhu, Lan Yang, Jiang-Baota Muhadesi, Bao-Jun Wang, Shuang-Jiang Liu
A novel Gram-stain-negative, rod-shaped, non-motile and red-pigmented bacterial strain, designated K1E01-27(T), was isolated from an animal excrement sample which was found in a karst cave located in Guizhou province, China. The phylogenetic analysis based on 16S rRNA gene sequences indicated that strain K1E01-27(T) represented a member of the genus Hymenobacter within the family Cytophagaceae of the phylum Bacteroidetes. Strain K1E01-27(T) was most closely related to Hymenobacter algoricola VUG-A23a(T), with 95...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Wen-Ming Chen, Wei-Ting Chen, Chiu-Chung Young, Shih-Yi Sheu
Strain ANT-18(T), isolated from a water sample taken from the Longtoushan Spring in Taiwan, was characterized using a polyphasic taxonomic approach. Cells of strain ANT-18(T) were Gram-stain-negative, aerobic, motile by gliding rods that were surrounded by a thick capsule and it formed pink colonies. Growth occurred at 20-37 °C (optimum, 25 °C), at pH 6-8 (optimum, pH 7) and with 0-1 % NaCl (w/; optimum, 0 %). Phylogenetic analyses, based on 16S rRNA gene sequences, showed that strain ANT-18(T) belongs to the genus Hymenobacter and showed the highest levels of sequence similarity to Hymenobacter ocellatus Myx 2105(T) (97...
October 6, 2017: International Journal of Systematic and Evolutionary Microbiology
Yoshitomo Morinaga, Norihiko Akamatsu, Junichi Matsuda, Hiroko Tateno, Takeshi Tomaru, Ai Tanaka, Sayuri Morita, Makoto Nakamura, Hideaki Kato, Megumi Annaka, Yoshishige Masuda, Yasutomo Itakura, Takashi Inamatsu, Katsunori Yanagihara
Laboratory underdiagnosis of toxigenic Clostridium difficile can lead to inappropriate management of C. difficile infection (CDI). A fully automated molecular test (FAMT), BD MAX, and enzyme immunoassays for C. difficile glutamate dehydrogenase (GDH) and for toxin A/B antigen test were evaluated using clinical specimens. Laboratory analysis of 231 fecal specimens from patients suspected with CDI, indicated that the sensitivity (Sn), specificity (Sp), positive predictive value (PPV), and negative predictive value (NPV) of FAMT was 98...
September 30, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
L C Oliveira, F C R Oliveira, N B Ederli
A new species of cestode of the genus Fuhrmannetta found in the small intestine of Cerradomys goytaca is described herein, named Fuhrmannetta jurubatensis n. sp. Rodents were collected from the sand-plains areas of the northern coast of the State of Rio de Janeiro, Brazil. Morphological analyses were conducted by light and scanning electron microscopy. From the morphological analysis and a comparison with the known species of the genus, F. jurubatensis n. sp. can be identified by a combination of morphological and morphometrical characteristics, including strobila length, number and length of rostellar hooks, position of the genital pore and the number of eggs per uterine capsule...
October 4, 2017: Journal of Helminthology
Bin Wu, Melvina, Xiangyang Wu, Edwin Kok Lee Yeow, Naohiko Yoshikai
We report herein a new approach for the synthesis of tellurium-bridged aromatic compounds based on the sequential electrophilic telluration of C(sp(2))-Zn and C(sp(2))-H bonds with tellurium(iv) chlorides. A combination of transition metal-catalyzed (migratory) arylmetalation of alkynes and sequential telluration allows for the expedient construction of a library of functionalized benzo[b]tellurophenes. Furthermore, a variety of heteroarene-fused benzotellurophenes and other novel tellurium-embedded polycyclic aromatics can be readily synthesized from the corresponding 2-iodoheterobiaryls...
June 1, 2017: Chemical Science
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