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Archives of Microbiology

Simone Marcelletti, Marco Scortichini
A complementary taxonomic and population genetic study was performed to delineate genetically and ecologically distinct species within the Pseudomonas syringae complex by assessing 16 strains including pathovar strains that have converged to infect Prunus spp. trees, and two outgroups. Both average nucleotide identity and genome-to-genome distance comparison methods revealed the occurrence of distinct genomospecies, namely 1, 2, 3 and 8 (sensu Gardan et al.), with the latter two being closely related. Strains classified as P...
September 18, 2018: Archives of Microbiology
Yaqian Wu, Junying An, Ying Liu, Yaling Wang, Wenbin Ren, Zhijia Fang, Lijun Sun, Ravi Gooneratne
Bacteriocin CAMT2, produced by Bacillus amyloliquefaciens ZJHD3-06, has been shown to exhibit protective activity against important food spoilage and food-borne bacterial pathogens. This study was conducted to investigate the mode of action of bacteriocin CAMT2 against highly pathogenic Listeria monocytogenes ATCC 19111. The addition of bacteriocin CAMT2 at 64 AU/ml inhibited L. monocytogenes ATCC 19111. An efflux of K+ ions, lactic acid dehydrogenase and an increase in extracellular electrical conductivity was observed in CAMT2-treated L...
September 10, 2018: Archives of Microbiology
Christos T Chasapis
Tetrahymena is a unicellular microbial eukaryotic organism that has been used extensively in toxicology and environmental research. This work attempts to model for the first time the wiring of proteins involved in cellular mechanisms of Cd toxicity in Tetrahymena thermophila. 1975 high-confidence PPIs between 68 Cd-binding proteins and 422 partners were inferred through a novel structural systems biology approach that utilizes comparative analysis between Tetrahymena and other eukaryotes for which experimentally supported protein interactomes exist...
September 7, 2018: Archives of Microbiology
Lyudmila A Romanenko, Valeriya V Kurilenko, Konstantin V Guzev, Vassilii I Svetashev, Valery V Mikhailov
An aerobic, Gram-negative, yellow-pigmented non-motile rod-shaped bacterium, designated Ch38T , was isolated from a sediment sample collected from the Chukchi Sea in the Arctic Ocean. Comparative 16S rRNA gene sequence analysis positioned strain Ch38T into the genus Winogradskyella as a distinct line adjacent to Winogradskyella multivorans KCTC 23891T , sharing the highest similarities of 97.5%, 97.2%, and 97.1% with Winogradskyella eximia KCTC 12219T , Winogradskyella damuponensis KCTC 23552T , and Winogradskyella multivorans KCTC 23891T , respectively...
September 5, 2018: Archives of Microbiology
Aline da Silva Câmara, Lohengrin Dias de Almeida Fernandes
To evaluate the impacts of the interaction between bacteria and microalgae has been the object of study by many research groups around the world. However, little is known about the interference that pigments produced by bacteria, such as the pyoverdine siderophore, can cause to microalgae like Isochrysis galbana. Pyoverdine is a fluorochrome produced by certain Pseudomonas strains, such as P. fluorescens, which plays a role in capturing and transporting iron ions from the environment to the cell. Unlike the oceans where Fe concentrations are extremely low (< 10-15 µM), in a ballast tank it is expected that there is a great supply of iron to the cells and that the absence of light is the main limiting factor until the water is discarded...
September 5, 2018: Archives of Microbiology
Olga Szaluś-Jordanow, Katarzyna Krysztopa-Grzybowska, Michał Czopowicz, Agata Moroz, Marcin Mickiewicz, Anna Lutyńska, Jarosław Kaba, Tomasz Nalbert, Tadeusz Frymus
Staphylococcus aureus subsp. anaerobius is an etiological agent of Morel's disease in small ruminants. The infection results in superficial abscesses located near lymph nodes. In the study, molecular analysis based on multilocus sequence typing (MLST) of seven housekeeping genes (arcC, aroE, glp, gmk, pta, tpi, yqiL) and random amplified polymorphic DNA (RAPD) was carried out on 19 S. aureus subsp. anaerobius strains isolated from two different goat herds from Poland. All of the 19 S. aureus subsp. anaerobius strains were found to belong to single MLST and RAPD types which support the high clonality level of this agent...
September 4, 2018: Archives of Microbiology
Chin-Feng Chang, Ching-Fu Lee, Shiu-Mei Liu
Cystobasidium keelungensis SN2T (CBS 6949 = BCRC 920080), a new anamorphic basidiomycetous yeast species, is described in this paper. The strains belonging to this species were isolated from the sea surface microlayer and underlying water in Taiwan. These strains were identified by examining nucleotide sequences in the species-specific D1/D2 domains of the large subunit (LSU) ribosomal RNA (rRNA) and by evaluating their physiological characteristics. Phylogenetic analyses of D1/D2 sequences revealed that C...
September 4, 2018: Archives of Microbiology
Yeyan Qiu, Shengni Tian, Liping Gu, Michael Hildreth, Ruanbao Zhou
In response to environmental changes, Anabaena cylindrica differentiate three cell types: vegetative cells for photosynthesis, heterocysts for nitrogen fixation, and akinetes for stress survival. Cell-surface polysaccharides play important roles in cyanobacterial ecophysiology. In this study, specific cell-surface sugars were discovered in heterocysts, akinetes and vegetative cells of A. cylindrica using 20 fluorescein-labeled lectins. Both N-acetylglucosamine-binding lectins WGA and succinylated WGA bound specifically to the vegetative cells...
September 1, 2018: Archives of Microbiology
Saqib Bilal, Liaqat Ali, Abdul Latif Khan, Raheem Shahzad, Sajjad Asaf, Muhammad Imran, Sang-Mo Kang, Sang-Kuk Kim, In-Jung Lee
Endophytic fungi have been used to obtain novel bioactive secondary metabolites with potential applications in medical and agricultural sectors, which can also act as lead targets for pharmaceutical and medicinal potential. In the present study, the endophytic fungus Paecilomyces formosus LHL10 isolated from the root of cucumber plant was tested for its enzyme inhibitory potential. The ethyl acetate (EtOAc) extract of LHL10 was screened for its inhibitory effect on acetylcholinesterase (AChE), α-glucosidase, urease, and anti-lipid peroxidation...
August 30, 2018: Archives of Microbiology
Ve Van Le, Shalem Raj Padakandla, Hyangmi Kim, Jong-Chan Chae
A novel Gram-reaction-negative, rod-shaped, non-motile bacterium, designated as strain G2-10T was isolated from effluent of a dairy manure treatment plant. Growth occurred at 20-40 °C (optimum at 25-30 °C), pH 7.0-8.0 (optimum at pH 7.0). The range of NaCl concentration for growth was between 0% and 3% (w/v) (optimum 0-1%, w/v). Comparison of 16S rRNA gene sequence indicated that strain G2-10T was moderately related to the type strains of Sphingobacterium nematocida M-SX103T and Sphingobacterium suaedae T47T with a pair-wise sequence similarity of 94...
August 29, 2018: Archives of Microbiology
Irina V Yegorenkova, Alla A Fomina, Kristina V Tregubova, Svetlana A Konnova, Vladimir V Ignatov
Bacterial polysaccharides are promising stimulants of protective functions in humans and animals. We investigated the ability of exopolysaccharide from the rhizobacterium Paenibacillus polymyxa CCM 1465 to induce nonspecific resistance factors in the macroorganism. We examined in vitro the effect of the exopolysaccharide, produced with different carbon sources, on the phagocytic activity of murine macrophages, on the generation of reactive oxygen species and of enzymes (acid phosphatase and myeloperoxidase), on the proliferation of murine splenocytes, and on the synthesis of proinflammatory cytokines [interleukin-1 (IL-1) and tumor necrosis factor α (TNF-α)] by human mononuclear cells...
August 28, 2018: Archives of Microbiology
Feng-Hua Tian, Dong-Yu Fan, Chen Zhang, Chuan-Wen Jia, Wei Gao, Yu Li, Chang-Tian Li
A Gram-staining-positive, aerobic, rod-shaped (201802YP6T ) bacteria was isolated from soil, Northeast of China. Growth occurred at 10-40 °C (optimum 25-30 °C), at pH 6.0-8.0 (optimum 7.0) and at 0-2% NaCl. Based on 16S rRNA gene sequence analysis, the nearest phylogenetic neighbors of strain 201802YP6T were identified as Bhargavaea cecembensis DSE10T (99.52%), Bhargavaea beijingensis ge10T (99.45%), Bhargavaea indica KJW98T (99.45%), Bhargavaea ullalensis ZMA19T (98.81%), and Bhargavaea ginsengi ge14T (98...
August 27, 2018: Archives of Microbiology
Suresh Gandham, Tushar Lodha, Sasikala Chintalapati, Venkata Ramana Chintalapati
An alkali-tolerant, Gram-stain-negative, motile, rod-to-oval-shaped, yellowish brown-colored, phototrophic bacterium, designated as strain JA916T , was isolated from an alkaline brown pond in Gujarat, India. The DNA G + C content of the strain JA916T was 65.1 mol%. Strain JA916T grew well at pH 10. Respiratory quinone was Q-10 and major fatty acid was C18:1 ω7c/C18:1 ω6c, with significant quantities of C15:0 2OH observed. Strain JA916T shared the highest 16S rRNA gene sequence similarity with the type strains of Rhodobacter johrii (98...
August 23, 2018: Archives of Microbiology
Yue Huo, Jong-Pyo Kang, Jin-Kyu Park, Jinfeng Li, Ling Chen, Deok-Chun Yang
A novel bacterium, designated DCY112T , was isolated from the rhizospheric soil of a ginseng-cultivated field in Gochang-gun, Republic of Korea. Based on 16S rRNA gene sequence analysis, this isolate was assigned to the genus Rhodanobacter and is closely related to Rhodanobacter soli DCY45T (98.0%) and R. umsongensis GR24-2T (98.0%). Strain DCY112T is Gram-negative, catalase- and oxidase-positive, aerobic, non-motile, rod-shaped, and produces yellow-pigmented colonies on R2A medium. Q-8 was the predominant respiratory quinone...
August 16, 2018: Archives of Microbiology
Vanessa Moura, Iris Ribeiro, Priscilla Moriggi, Artur Capão, Carolina Salles, Suleima Bitati, Luciano Procópio
To explore how a succession of bacteria grown on steel coupons in a marine environment can influence their corrosion process, we designed a microcosm in laboratory to evaluate corrosion kinetics and microbial diversity over 30 days. The results described a clear influence of corrosion by a succession of different bacterial groups. During the initial period, 2-7 days, a sharp increase in the rate of corrosion was detected accompanied by the presence of Alteromonadaceae, Vibrionaceae, Oceanospirillaceae, Rhodobacteraceae, Rhodospirillaceae and Flavobacteriaceae bacteria families...
August 14, 2018: Archives of Microbiology
Md Amdadul Huq
A Gram-stain negative, aerobic, non-motile, and rod-shaped novel bacterial strain, designated MAH-2T , was isolated from a soil sample of rose garden and was characterized using a polyphasic approach. The colonies were light pink color, smooth, circular and 0.2-0.6 mm in diameter when grown on nutrient agar for 3 days. Strain MAH-2T grows at 15-40 °C (optimum growth temperature 30 °C), at pH 5.0-7.0 (optimum growth pH 6.5) and at 0-2% NaCl (optimum 0-0.5%). Cell growth occurs on nutrient agar and R2A agar but not on tryptone soya agar, luria-bertani agar and MacConkey agar...
July 30, 2018: Archives of Microbiology
C Mekadim, J Killer, J Mrázek, V Bunešová, R Pechar, Z Hroncová, E Vlková
Detailed differentiation, classification, and phylogenetic analysis of the order Lactobacillales are performed using molecular techniques that involve the comparison of whole genomes, multilocus sequence analysis, DNA-DNA hybridisation, and 16S rRNA sequencing. Despite the wide application of the latter two techniques, issues associated with them are extensively discussed. Although complete genomic analyses are the most appropriate for phylogenetic studies, they are time-consuming and require high levels of expertise...
July 23, 2018: Archives of Microbiology
Poulomi Chakraborty, Akshay Vishnu Daware, Monika Kumari, Ahana Chatterjee, Disha Bhattacharyya, Garbita Mitra, Yusuf Akhter, Surajit Bhattacharjee, Prosun Tribedi
Microbial biofilm reveals a cluster of microbial population aggregated on a surface. Pseudomonas aeruginosa, a strong biofilm forming organism, often causes several human diseases. Microorganism-based diseases become more difficult to manage when the causative organism develops biofilm during the course of disease progression as the organism attains alarming drug resistance in biofilm form. Agents inhibiting microbial biofilm formation could be considered as a potential tool to weaken the extent of microbial pathogenesis...
July 23, 2018: Archives of Microbiology
Chris Maltman, Vladimir Yurkov
Environmental contamination by Te and Se oxyanions has become a serious concern, with the search for green, ecologically friendly methods for removal gaining ground. Bacteria capable of reducing these highly toxic compounds to a virtually non-toxic elemental form could provide a solution. In this study, four strains of bacteria with potential for bioremediation of Te and Se oxyanions were investigated. Under aerobic conditions over 48 h, Erythromicrobium ramosum, strain E5 removed 244 µg/ml tellurite and 98 µg/ml selenite, Erythromonas ursincola, KR99 203 µg/ml tellurite and 100 µg/ml selenite, AV-Te-18 98 µg/ml tellurite and 103 µg/ml selenite and ER-V-8 93 µg/ml tellurite and 103 µg/ml selenite...
July 23, 2018: Archives of Microbiology
Asma Benslim, Samia Mezaache-Aichour, Nora Haichour, Kamel Aissat, Mohamed Mihoub Zerroug
45 bacterial isolates from potatoes and wheat rhizospheres near Sétif (Algeria) pre-selected for their antagonistic activity against three fungal plant pathogens, two necrotrophic Fusarium solani var. coeruleum and Phytophtora infestans, and a systemic F. oxysporum f. sp. albedinis. Molecular typing of the isolates showed abundance of Bacillus compared to Pseudomonas. Some of the tested strains have shown very high biofilm formation. Among the 24 Gram-positive bacilli screened for four cyclic lipopeptides genes, some isolates harbor two or more genes, while others have a single gene or have none...
July 21, 2018: Archives of Microbiology
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