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Current Microbiology

Jie Liu, Yi Song, Xiaoguang Lu, Tuo Chen, Wenxiu Guo, Zhiwei Fan, Xin Kang, Yu Wang, Yi Wang
Recently, several studies have indicated that the intestinal microbiota can be regulated by the individual attributes, and even the alternation of circadian rhythm. Inspired by this, we speculated that seasonal variation might also have some effect on the intestinal microbiota. A total of 11 Sprague-Dawley male rats, weighing 250-280 g, were divided into summer group (n = 5) and winter group (n = 6). Cages were individually ventilated at 20 ± 2 °C and 45-65% relative humidity with a circadian rhythm of 12/12 h...
March 15, 2018: Current Microbiology
Silvina M Y López, Ma Dolores Molina Sánchez, Graciela N Pastorino, Mario E E Franco, Nicolás Toro García, Pedro A Balatti
The purpose of this work was to study further two Bradyrhizobium japonicum strains with high nitrogen-fixing capacity that were identified within a collection of approximately 200 isolates from the soils of Argentina. Nodulation and nitrogen-fixing capacity and the level of expression of regulatory as well as structural genes of nitrogen fixation and the 1-aminocyclopropane-1-carboxylate (ACC) deaminase gene of the isolates were compared with that of E109-inoculated plants. Both isolates of B. japonicum, 163 and 366, were highly efficient to fix nitrogen compared to commercial strain E109...
March 15, 2018: Current Microbiology
Yingying Li, Wenying Zhang, Yu Zuo, Ting Zhu, Yue Pang, Tiesong Li, Qingwei Li
Lamprey was considered to be one of the most basal jawless vertebrate representatives for studying vertebrate evolution, embryo development, and the origin of adaptive immunity. Here we investigated the effect of the gut-derived Aeromonas on the lamprey leukocytes proteome using the label-free liquid chromatography-tandem mass spectrometry for quantitative proteomics analysis. Significant difference was observed in the regulation of 34 out of 755 proteins in Aeromonas-immunized lamprey. 31 proteins were only identified in saline solution-immunized lamprey and 47 proteins were only identified in Aeromonas-immunized lamprey...
March 14, 2018: Current Microbiology
Kris Niño G Valdehuesa, Kristine Rose M Ramos, Llewelyn S Moron, Imchang Lee, Grace M Nisola, Won-Keun Lee, Wook-Jin Chung
The continued research in the isolation of novel bacterial strains is inspired by the fact that native microorganisms possess certain desired phenotypes necessary for recombinant microorganisms in the biotech industry. Most studies have focused on the isolation and characterization of strains from marine ecosystems as they present a higher microbial diversity than other sources. In this study, a marine bacterium, W5C, was isolated from red seaweed collected from Yeosu, South Korea. The isolate can utilize several natural polysaccharides such as agar, alginate, carrageenan, and chitin...
March 13, 2018: Current Microbiology
Jana Kisková, Zuzana Perháčová, Ladislav Vlčko, Jana Sedláková, Simona Kvasnová, Peter Pristaš
Although neutral mine drainage is the less frequent subject of the interest than acid mine drainage, it can have adverse environmental effects caused mainly by precipitation of dissolved Fe. The aim of the study was to characterize the composition of bacterial population in environment with high concentration of iron and sulfur compounds represented by neutral mine drainage water of Elizabeth's shaft, Slovinky (Slovakia). Direct microscopic observations, cultivation methods, and 454 pyrosequencing of the 16S rRNA gene amplicons were used to examine the bacterial population...
March 12, 2018: Current Microbiology
Giancarlo Ripabelli, Manuela Tamburro, Giuliana Guerrizio, Incoronata Fanelli, Romeo Flocco, Massimiliano Scutellà, Michela L Sammarco
Antimicrobial-resistant Klebsiella pneumoniae represent a global public health concern. K. pneumoniae strains isolated during 2010 and 2014-2016 within a single hospital of Molise Region, Central Italy, were analyzed testing antimicrobial susceptibility, clonality by pulsed-field gel electrophoresis (PFGE) and random amplified polymorphic DNA (RAPD)-PCR, and prevalence of carbapenem resistance genes by PCR. Forty isolates (23 wild-type in 2010 and 17 non-wild-type in 2014-2016) were collected from hospitalized patients (65...
March 9, 2018: Current Microbiology
Qihao Wu, Gaiyun Zhang, Bixia Wang, Xin Li, Shaopeng Yue, Jianwei Chen, Huawei Zhang, Hong Wang
The natural products discovery program in our group utilizes deep-sea sediment-derived microorganisms and employs a bio-active guided isolation procedure and one strain many compounds (OSMAC) approach to screen bio-active natural products for practical applications in the medicinal and agricultural industry. OSMAC strategy is employed to stimulate secondary metabolite production through changing culture conditions. In this paper, we applied cultivation-dependent procedure, changing media type, leading to the discovery of a bio-active compound named inthomycin B (1) from a marine-derived Streptomyces sp...
March 8, 2018: Current Microbiology
Carmen Ventura, Carlos I Briones-Roblero, Emilio Hernández, Flor N Rivera-Orduña, Gerardo Zúñiga
Fruit flies are the most economically important group of phytophagous flies worldwide. Whereas the ecological role of bacteria associated with tephritid fruit fly species of the genera Bactrocera and Ceratitis has been demonstrated, the diversity of the bacterial community in Anastrepha has been poorly characterized. This study represents the first comprehensive analysis of the bacterial community in the gut of larvae and adults of Anastrepha ludens, A. obliqua, A. serpentina, and A. striata using 454 pyrosequencing...
March 8, 2018: Current Microbiology
Francisco X Nascimento, Maria J Tavares, Bernard R Glick, Márcio J Rossi
Several rhizobial strains possess the ability to modulate leguminous plants ethylene levels by producing the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase. While the effect of ACC deaminase has been studied in several rhizobia belonging to the Alphaproteobacteria class, not much is understood about its impact in the nodulation abilities of rhizobia belonging to the Betaproteobacteria class, which are common symbionts of Mimosa species. In this work, we report the impact of ACC deaminase production by the Betaproteobacterium, Cupriavidus taiwanensis STM894, and its role in the nodulation of Mimosa pudica...
March 7, 2018: Current Microbiology
Anita Risa, Csilla Krifaton, József Kukolya, Balázs Kriszt, Mátyás Cserháti, András Táncsics
Aflatoxin B1 (AFB1) and zearalenone (ZON) are dangerous mycotoxins due to their carcinogenicity or oestrogenicity. To alleviate negative effects on humans and animals, successful detoxification tools are needed. The application of microorganisms to biodegrade mycotoxins can be an effective way in food and feed industry enhancing food safety. Several Rhodococcus strains are effective in the degradation of aromatic mycotoxins and their application in mycotoxin biodetoxification processes is a promising field of biotechnology...
March 6, 2018: Current Microbiology
Zahoor A Wani, Tanveer Ahmad, Yedukondalu Nalli, Asif Ali, Avneet Pal Singh, Ram A Vishwakarma, Nasheeman Ashraf, Syed Riyaz-Ul-Hassan
Saffron (Crocus sativus L.) is one of the most expensive spices in the world due to its medicinal and aromatic value. However, saffron production is severely affected by the corm rot disease throughout the saffron producing countries. In this study, we report a basidiomycetous latent pathogen of saffron, designated as CSE26, capable of producing phytotoxic compounds. CSE26 is a highly odorous basidiomycete with monomitic hyphal system. Molecular phylogeny of ITS and 28S ribosomal gene sequence of CSE26 assigned it as Porostereum spadiceum...
February 28, 2018: Current Microbiology
Qi Tang, Lipeng Qiu, Guohui Li
MicroRNAs (miRNAs) are a class of non-coding RNAs with ∼22 nucleotides, which are able to regulate various biological processes, including the viral life cycle and host-pathogen interactions. Long primary transcripts (pri-miRNAs) are initially transcribed in nucleus, and subsequently processed by Dicer in cytoplasm to generate mature miRNAs. Baculoviruses consist of large, enveloped, insect-pathogenic viruses with a double-stranded circular DNA genome. Recent studies suggest that baculoviruses encode some miRNAs to manipulate expression regulation of host genes, whereas host modulate viral gene expression via miRNAs to limit viral infection...
February 27, 2018: Current Microbiology
Lorenzo Bevilacqua, Annalisa Milan, Veronica Del Lupo, Michele Maglione, Lucilla Dolzani
Microbial biofilms developed on dental implants play a major role in perimplantitis' pathogenesis. Many studies have indicated that surface roughness is the main feature favoring biofilm development in vitro, but its actual influence in vivo has still to be confirmed. In this study, the amount of biofilm formed on differently treated titanium surfaces, showing distinct roughness, has been examined both in vivo and in vitro by Confocal Laser Scanning Microscopy. In vitro studies availed of biofilm developed by Pseudomonas aeruginosa or by salivary bacteria from volunteer donors...
February 27, 2018: Current Microbiology
Zülal Kesmen, Mine E Büyükkiraz, Esra Özbekar, Mete Çelik, F Özge Özkök, Özge Kılıç, Bülent Çetin, Hasan Yetim
Multi Fragment Melting Analysis System (MFMAS) is a novel approach that was developed for the species-level identification of microorganisms. It is a software-assisted system that performs concurrent melting analysis of 8 different DNA fragments to obtain a fingerprint of each strain analyzed. The identification is performed according to the comparison of these fingerprints with the fingerprints of known yeast species recorded in a database to obtain the best possible match. In this study, applicability of the yeast version of the MFMAS (MFMAS-yeast) was evaluated for the identification of food-associated yeast species...
February 26, 2018: Current Microbiology
Mihee Oh, Jong-Hwa Kim, Jung-Hoon Yoon, Peter Schumann, Wonyong Kim
A Gram-stain-positive, non-spore-forming, yellow pigmented, non-motile, aerobic, short rod-shaped bacterial strain, designated CAU 1455T , was isolated from marine sediment sand. Strain CAU 1455T grew optimally at 30 °C and at pH 7.5 in the presence of 1% (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain CAU 1455T was affiliated to the genus Cellulosimicrobium and was most closely related to Cellulosimicrobium terreum DS-61T (similarity 97.9%). The strain possessed MK-9 (H4 ) as the predominant menaquinone and anteiso-C15:0 as the major cellular fatty acids...
February 26, 2018: Current Microbiology
Shivani Vaidya, Kamal Dev, Anuradha Sourirajan
Two strict halophilic bacterial strains, Halobacillus trueperi SS1, and Halobacillus trueperi SS3, and three halotolerant bacterial strains, Shewanella algae SS2, Halomonas venusta SS5, and Marinomonas sp. SS8 of Lunsu salt water body, Himachal Pradesh, India, were selected to study the mechanism of salt tolerance and the role of osmolytes therein. A combination of flame photometry, chromatographic and colorimetric assays was used to study the mechanism of salt tolerance in the selected strict halophilic and halotolerant bacterial strains...
February 26, 2018: Current Microbiology
Ngoc Tuan Nguyen
Emulsifiers like polysorbate family, carboxymethyl cellulose are widely used in the preparation of drugs, vaccines, food, cosmetics, and skin care products. In this study, strain SP2 is isolated for the high-efficiency utilization of emulsifier as its sole carbon and energy source. Strain grows on the polysorbate family with generation time ranging from 0.8 to 2.2 h. It is sensitive to ampicillin, gentamicin, imipenem, penicillin, and vancomycin, but resistant to amikacin, cefoxitin, erythromycin, kanamycin, nalidixic acid, and tetracycline...
February 24, 2018: Current Microbiology
Momoka Terasaki, Sayaka Miyagawa, Masato Yamada, Hiromi Nishida
There are two types of starter cultures used in Japanese rice wine (sake) fermentation, namely, sokujo-moto and yamahai-moto. Analyses of microbiota changes during sake production using yamahai-moto have already been reported. In this study, we analyzed microbiota changes during sake production using sokujo-moto. In addition, we sequenced bacterial DNA from the water used in sake production. The Lactobacillus DNA sequences, which are frequently detected during sake production using yamahai-moto, were not detected during sake production using sokujo-moto, indicating that the Lactobacillus DNA detected in sakes made from yamahai-moto is from the fermentation starter...
February 22, 2018: Current Microbiology
Manuela Oliveira Ramalho, Alexsandro Santana Vieira, Mayara Cristina Pereira, Corrie Saux Moreau, Odair Correa Bueno
Camponotus is a hyper-diverse ant genus that is associated with the obligate endosymbiont Blochmannia, and often also with Wolbachia, but morphological studies on the location of these bacteria in the queen's ovaries during oogenesis remain limited. In the present study, we used the Neotropical weaver ant Camponotus textor to characterize the ovary using histology (HE) techniques, and to document the location of Blochmannia and Wolbachia during oogenesis through fluorescence in situ hybridization (FISH). This is the first morphological report of these two bacteria in the same host with polytrophic meroistic ovaries and reveals that Blochmannia is found inside late-stage oocytes and Wolbachia is associated with the nuclei of the nurse cells...
February 21, 2018: Current Microbiology
Agni Hadjilouka, Spiros Paramithiotis, Eleftherios H Drosinos
The aim of the present study was to apply descriptive, phylogenetic, recombination, and selection analyses on alignments of the Listeria Pathogenicity Island 1 (LIPI-1) of 1/2a and 4b Listeria monocytogenes isolates of different origin in order to gain insights into the evolution of this virulence gene cluster. For that purpose, a total of 19 L. monocytogenes isolates (9 meat isolates, serotype 1/2a; 5 meat isolates, serotype 4b; 5 strawberry isolates, serotype 4b) that have been previously separated at strain level were subjected to sequencing of their LIPI-1...
February 21, 2018: Current Microbiology
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