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Antonie Van Leeuwenhoek

Radhey S Gupta, Jeen Son, Aharon Oren
The "Spiroplasma cluster" is a taxonomically heterogeneous assemblage within the phylum Tenericutes encompassing different Entomoplasmatales species as well as the genus Mycoplasma, type genus of the order Mycoplasmatales. Within this cluster, the family Entomoplasmataceae contains two non-cohesive genera Entomoplasma and Mesoplasma with their members exhibiting extensive polyphyletic branching; additionally, the genus Mycoplasma is also embedded within this family. Genome sequences are now available for all 19 Entomoplasmataceae species with validly published names, as well as 6 of the 7 species from the genus Mycoplasma...
November 3, 2018: Antonie Van Leeuwenhoek
Wei Zhao, Hong-Jing Cui, Kun-Pei Qiu, Tao Zhou, Xiao-Shan Hong, Xin-Guang Liu
The Saccharomyces cerevisiae chaperone gene SSB2 belongs to the Hsp70 family. Unlike other HSP70 genes, SSB2 gene expression is reduced after heat shock. It has been reported that Ssb2p can be cross-linked to ribosome-bound nascent polypeptide chains, suggesting a potential role of SSB2 in the endoplasmic reticulum (ER) stress response. In this study, SSB2-deletion and SSB2-overexpression yeast strains were generated and applied to explore the potential mechanism by which SSB2 is involved in the tunicamycin (TM)-induced ER stress response...
October 31, 2018: Antonie Van Leeuwenhoek
Min-Zhi Jiang, Zhi-Jun Qiu, Guang-Wu Zhang, Shi-Yin Gao, Xiao-Yan You, Ying-Fei Ma
An aerobic, Gram-stain negative, rod-shaped and non-motile strain, BJC16-A31T , was isolated from the wetland soil sample taken from Daxing'anling, Heilongjiang, People's Republic of China. Strain BJC16-A31T was found to be oxidase- and catalase-positive, and produced light orange colonies on modified R2A agar. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain BJC16-A31T is closely related to Mucilaginibacter gotjawali SA3-7T with 96.54% sequence similarity and it formed a separate lineage in the genus Mucilaginibacter...
October 30, 2018: Antonie Van Leeuwenhoek
Genet Birmeta, Albina Bakeeva, Volkmar Passoth
Enset (Ensete ventricosum) is the basis of the staple food consumed by about 20% of the Ethiopian population. Kocho is one of the food products generated from enset by spontaneous fermentation of decorticated and pulverized pseudostem and corm sections. We isolated culturable microbes associated with kocho from different stages of fermentation. Twelve yeast species, six lactic acid bacteria (LABs) species and eleven species of aerobic bacteria were identified by sequencing ITS/D1D2 regions of 26S rDNA of yeasts and 16S rDNA of bacteria, respectively...
October 27, 2018: Antonie Van Leeuwenhoek
Eiji Tanaka, Motoo Koitabashi, Hiroko Kitamoto
The basidiomycetous yeast Moesziomyces antarcticus (often cited as Pseudozyma antarctica), originally isolated from a sediment sample obtained from Lake Vanda in Antarctica, was asexually typified but closely related to the smut fungus Moesziomyces bullatus (Ustilaginales). We found a smut fungus on an ovary of barnyardgrass (Echinochloa crus-galli) in Japan, which had been identified as M. bullatus. The teliospores germinated and formed yeast-like colonies. Physiological and phylogenetic studies revealed that the characteristics of the yeast-like isolates coincided with those of "P...
October 27, 2018: Antonie Van Leeuwenhoek
Longwei Wang, Yamei Li, Yumei Li
A novel actinomycete, designated strain NX62T , was isolated from desert soil obtained from Isolaginsha, Ningxia Hui Autonomous Region, China. Its taxonomic position was determined using a polyphasic approach. The strain shows the typical morphological and chemotaxonomic features of members of the genus Lentzea: slight to dark yellow substrate mycelia and white to greyish white aerial hyphae fragmenting into rod-shaped elements; meso-diaminopimelic acid in the cell wall peptidoglycan; MK-9(H4 ) and MK-9(H2 ) as menaquinones; diphosphatidylglycerol, phosphatidylethanolamine, hydroxy-phosphatidylethanolamine and phosphatidylinositol as main polar lipids; iso-C16:0 and iso-C17:0 as major cellular fatty acids; and DNA G+C content of 70...
October 25, 2018: Antonie Van Leeuwenhoek
Ibrahim S Abujabhah, Richard B Doyle, Sally A Bound, John P Bowman
This study determined the loading impacts of wood-based biochar on the eukaryotic community in three different soils (brown sandy loam-BSL, red loam-RL and a black clay loam-BCL) using a pot trial conducted over 10 months. Soil analysis and 18S rRNA gene sequencing performed using the Illumina MiSeq platform was carried out to evaluate the changes in eukaryotic community composition in relation to different added amounts of biochar. It was found that biochar addition had a negligible effect on diversity parameters in the brown sandy loam Kurosol (BSL) and red loam Dermosol (RL) soils...
October 24, 2018: Antonie Van Leeuwenhoek
Radhey S Gupta, Sahil Sawnani, Mobolaji Adeolu, Seema Alnajar, Aharon Oren
In Tables 9, 10 and 11 of this paper, a few minor errors were noticed in the information for the type strains of the following new name combinations proposed in our paper.
October 16, 2018: Antonie Van Leeuwenhoek
Tingye Feng, Kyung Hyun Kim, Jeill Oh, Che Ok Jeon
A Gram-stain negative, strictly aerobic, mesophilic bacterial strain, designated strain S23T , was isolated from pond-side soil of an artificial pond in South Korea. Cells were observed to be peritrichously flagellated short rods showing positive oxidase and catalase activities. Growth of strain S23T was observed at 15-37 °C (optimum, 30 °C), pH 5.0-9.0 (optimum, pH 7.0-8.0) and 0-2% (w/v) NaCl (optimum, 0-0.5%). The major respiratory quinone was identified as ubiquinone-8 and the major fatty acids were identified as C16:0 , cyclo-C17:0 , summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and summed feature 8 (C18:1 ω7c and/or C18:1 ω6c)...
October 13, 2018: Antonie Van Leeuwenhoek
Qin Xu, Heng-Lin Cui, Fanwei Meng
A novel halophilic archaeon, designated NK23T , was isolated from an inland saline soil sampled from Xinjiang, China. The cells of strain NK23T were observed to be pleomorphic, to stain Gram-negative and form red-pigmented colonies on agar plates. The strain can grow at 25-50 °C (optimum 37 °C), at 0.9-4.8 M NaCl (optimum 2.1 M), at 0-1.0 M MgCl2 (optimum 0.05 M) and at pH 6.5-9.5 (optimum pH 7.0). The polar lipids were found to be phosphatidic acid, phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester, mannosyl glucosyl diether, sulfated mannosyl glucosyl diether, and three minor unidentified glycolipids, which were chromatographically identical to those detected in Haloprofundus (Hpf...
October 13, 2018: Antonie Van Leeuwenhoek
Matthias Sipiczki, Samy A Selim
Non-pathogenic yeasts antagonising microorganisms that cause pre- and postharvest diseases of plants have been found in diverse habitats. Their practical applicability as biocontrol agents (BCAs) depends on the strength of their antagonistic activity and/or spectrum of sensitive target microorganisms. In this study, yeasts were isolated from the phylloplane and fruits of plants growing in the alkaline water lake region Wadi El-Natrun, Egypt, and tested for antifungal and antibacterial activity. All phylloplane yeast isolates belonged to the Basidiomycota and most of them could antagonise at least certain test organisms...
October 13, 2018: Antonie Van Leeuwenhoek
Abdlrhman M Alsonosi, Ondrej Holy, Stephen J Forsythe
Cronobacter malonaticus is a member of the genus Cronobacter which is considered an opportunistic pathogen. The significance of C. malonaticus has recently increased since it was documented to be involved in several serious neonatal infections. However, the virulence factors of C. malonaticus including their ability to adhere, invade and overcome host barriers have not been studied before. Unlike previous Cronobacter research, this study is mainly focused on C. malonaticus and is aimed to investigate its virulence characteristics that enable this species to cause adult and neonatal infections...
October 12, 2018: Antonie Van Leeuwenhoek
Ana I Ribeiro-Barros, Sílvia Catarino, Isabel Moura, José C Ramalho, Maria M Romeiras, Faten Ghodhbane-Gtari
Actinorhizal plants are a group of perennial dicotyledonous angiosperms, comprised of more than 200 species, most of which can establish root-nodule symbiosis with the nitrogen fixing actinobacteria of the genus Frankia. They are key providers of fundamental goods and services and can give a major contribution to mitigate the combined effects of climate changes, human population growth and loss of biodiversity. This aspect is particularly relevant for the developing economies of many African countries, which are highly exposed to climate and anthropogenic disturbances...
October 12, 2018: Antonie Van Leeuwenhoek
Md Amdadul Huq, Shahina Akter, Sun-Young Lee
A Gram-stain negative, aerobic, non-motile and rod-shaped novel bacterial strain, designated as MAH-5T , was isolated from a road-side soil sample and was characterised by using a polyphasic taxonomic approach. The colonies were observed to be yellowish orange in colour, smooth, circular and 0.3-0.7 mm in diameter when grown on nutrient agar for 2 days. Strain MAH-5T was found to be able to grow at 15-35 °C and at pH 4.0-8.0. The strain was observed to be positive for both the catalase and oxidase tests...
October 10, 2018: Antonie Van Leeuwenhoek
Valérie Hocher, Mariama Ngom, Alyssa Carré-Mlouka, Pierre Tisseyre, Hassen Gherbi, Sergio Svistoonoff
Plants able to establish a nitrogen-fixing root nodule symbiosis with the actinobacterium Frankia are called actinorhizal. These interactions lead to the formation of new root organs, called actinorhizal nodules, where the bacteria are hosted intracellularly and fix atmospheric nitrogen thus providing the plant with an almost unlimited source of nitrogen for its nutrition. Like other symbiotic interactions, actinorhizal nodulation involves elaborate signalling between both partners of the symbiosis, leading to specific recognition between the plant and its compatible microbial partner, its accommodation inside plant cells and the development of functional root nodules...
October 10, 2018: Antonie Van Leeuwenhoek
Jackeline Rossetti Mateus, Joana Montezano Marques, Isabella Dal'Rio, Renata Estebanez Vollú, Marcia Reed Rodrigues Coelho, Lucy Seldin
Sweet potato is a subsistence crop cultivated worldwide. Although it is generally considered tolerant to different diseases, it is quite susceptible to the fungus Plenodomus destruens that causes foot-rot disease. Plant growth-promoting bacteria associated with sweet potato remain poorly studied, but some Bacillus strains may have potential as biological control agents. Here, we evaluate the persistence of two bacterial strains-Bacillus safensis T052-76 and Bacillus velezensis T149-19-in pot experiments and assess their impact on indigenous bacterial and fungal communities associated with sweet potato...
October 10, 2018: Antonie Van Leeuwenhoek
Junwei Cao, Ping Liu, Renju Liu, Hainan Su, Yuli Wei, Rulong Liu, Jiasong Fang
A piezotolerant, cold-adapted, slightly halophilic bacterium, designated strain PWS21T , was isolated from a deep-sea sediment sample collected from the New Britain Trench. Cells were observed to be Gram-stain negative, rod-shaped, oxidase- and catalase-positive. Growth of the strain was observed at 4-45 °C (optimum 37 °C), at pH 5.0-9.0 (optimum 7.0) and in 0.5-20% (w/v) NaCl (optimum 3-4%). The optimum pressure for growth was 0.1 MPa (megapascal) with tolerance up to 70 MPa. 16S rRNA gene sequence analysis showed that strain PWS21T is closely related to Marinobacter guineae M3BT (98...
October 9, 2018: Antonie Van Leeuwenhoek
Wenjing Wu, Yu Feng, Zhiyong Zong
An Enterobacter strain, WCHECl-C4, was recovered from a human blood sample in China in 2015. Phylogenetic analysis based on multi-locus sequence analysis of the rpoB, gyrB, infB and atpD housekeeping genes revealed that the strain is distinct from any previously described species of the genus Enterobacter. The whole genome sequence of strain WCHECl-C4 has an 80.48-93.34% average nucleotide identity with those of type strains of all known Enterobacter species. In silico DNA-DNA hybridization (isDDH) values between strain WCHECl-C4 and type strains of all known Enterobacter species range from 23...
October 9, 2018: Antonie Van Leeuwenhoek
Dongmei Li, Liyuan Han, Junwei Zhao, Hanxun Ju, Shanwen Jiang, Xiaowei Guo, Xiangjing Wang, Wensheng Xiang
A novel actinobacterium, designated strain NEAU-GS4T , was isolated from soil collected from Mount Song and characterised using a polyphasic approach. 16S rRNA gene sequence similarity studies showed that strain NEAU-GS4T belongs to the genus Streptomyces, being closely related to Streptomyces spectabilis JCM 4308T (98.8%), Streptomyces sclerotialus DSM 43032T (98.3%) and Streptomyces lasiicapitis 3H-HV17(2)T (98.0%). A multilocus sequence analysis based on five house-keeping genes (atpD, gyrB, rpoB, recA and trpB) also indicated that strain NEAU-GS4T should be assigned to the genus Streptomyces...
October 9, 2018: Antonie Van Leeuwenhoek
Tiago R Silva, Ramon Canela-Garayoa, Jordi Eras, Marili V N Rodrigues, Fábio N Dos Santos, Marcos N Eberlin, Iramaia A Neri-Numa, Glaucia M Pastore, Renata S N Tavares, Hosana M Debonsi, Lorena R G Cordeiro, Luiz H Rosa, Valéria M Oliveira
An iridescent yellow pigmented bacterium isolated from the Antarctic continent, named Cellulophaga fucicola strain 416, was found to be able to tolerate UV-B radiation. Its crude pigment extract was tested for antioxidant capacity, UV light stability and phototoxicity profile against murine fibroblast lines. The pigments were further isolated and chemically identified by ultra-high-performance liquid chromatography with photodiode array and mass spectrometry detectors. The results showed that the pigment extract presented weak stability under exposure to UV light, a phototoxic profile in the 3t3 Neutral Red Uptake test and a very high antioxidant activity, suggesting that it could be used as food and feed colourants...
October 9, 2018: Antonie Van Leeuwenhoek
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