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Archives of Microbiology

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https://www.readbyqxmd.com/read/28887685/isolation-of-a-fungus-pencicillium-sp-with-zinc-tolerance-and-its-mechanism-of-resistance
#1
Yue Teng, Xianzheng Du, Tao Wang, Chenyu Mi, Hongyan Yu, Luyi Zou
A zinc (Zn)-tolerant fungus, designated BC109-2, was isolated from rhizosphere soil and was identified as Penicillium janthinellum BC109-2 based on ITS sequence analysis. To understand its Zn tolerance mechanisms, a series of studies was carried out addressing the subcellular distribution of Zn, its chemical forms, and the antioxidant system (superoxide dismutase, catalase, peroxidase, glutathione reductase, glutathione S-transferase, reduced glutathione, oxidized glutathione and malondialdehyde) of the fungus...
September 8, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28887679/microbiological-studies-of-hot-springs-in-india-a-review
#2
REVIEW
Abhijit Poddar, Subrata K Das
The earliest microbiological studies on hot springs in India date from 2003, a much later date compared to global attention in this striking field of study. As of today, 28 out of 400 geothermal springs have been explored following both culturable and non-culturable approaches. The temperatures and pH of the springs are 37-99 °C and 6.8-10, respectively. Several studies have been performed on the description of novel genera and species, characterization of different bio-resources, metagenomics of hot spring microbiome and whole genome analysis of few isolates...
September 8, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28879417/potential-for-aerobic-no2-reduction-and-corresponding-key-enzyme-genes-involved-in-alcaligenes-faecalis-strain-nr
#3
Yuan Sheng Huang, Qiang An, Bin Zhao, Qing Hao Lv, Jing Song Guo
The potential for aerobic NO2(-) removal by Alcaligenes faecalis strain NR was investigated. 35 mg/L of NO2(-)-N was removed by strain NR under aerobic conditions in the presence of NH4(+). (15)N-labeling experiment demonstrated that N2O and N2 were possible products during the aerobic nitrite removal process by strain NR. The key enzyme genes of nirK, norB and nosZ, which regulate the aerobic nitrite denitrification process, were successfully amplified from strain NR. The gene sequence analysis indicates that copper-containing nitrite reductase (NIRK) and periplasmic nitrous oxide reductase (NOSZ) were both hydrophilic protein and the transmembrane structures were absent, while nitric oxide reductase large subunit (NORB) was a hydrophobic and transmembrane protein...
September 6, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28864945/fecal-microbiota-of-lambs-fed-purple-prairie-clover-dalea-purpurea-vent-and-alfalfa-medicago-sativa
#4
Qianqian Huang, Devin B Holman, Trevor Alexander, Tianming Hu, Long Jin, Zhongjun Xu, Tim A McAllister, Surya Acharya, Guoqi Zhao, Yuxi Wang
The present study assessed the effect of purple prairie clover (PPC) and PPC condensed tannins (CT) on the fecal microbiota of lambs using high-throughput 16S rRNA gene pyrosequencing. A total of 18 individual lambs were randomly divided into three groups and fed either green chop alfalfa (Alf), a 40:60 (DM basis; Mix) mixture of Alf and PPC, or Mix supplemented with polyethylene glycol (Mix-P) for 18 days. Fecal samples were collected on days 13 through 18 using digital rectal retrieval. The DNA of fecal samples was extracted and the microbial 16S rRNA gene amplicons were sequenced using 454 pyrosequencing...
September 1, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28831526/global-invasive-cochliobolus-species-cohort-of-destroyers-with-implications-in-food-losses-and-insecurity-in-the-twenty-first-century
#5
Louis Bengyella, Elsie Laban Yekwa, Kiran Nawaz, Sehrish Iftikhar, Ernest Tambo, Arghavan Alisoltani, Naser Aliye Feto, Pranab Roy
Matching the global food demand by 2050 and to ensure the stability of food security in over than 99 countries, it is necessary to scale up the production of food such as sorghum, wheat, rice, maize and sugarcane which are however natural hosts of Cochliobolus species. Cochliobolus species major epidemics such as the Great Bengal famine, Southern corn leaf blight, and Northern leaf spot blight were associated with substantial economic losses in the past decades. Thus, there is an urgent need to establish a specific coordinated global surveillance program for the migration of invasive Cochliobolus species, planning contextual control programs engaging all agricultural stakeholders and information sharing in real time for prevention of disastrous Cochliobolus disease outbreak effects...
August 22, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28825122/a-capsule-lipopolysaccharide-mlst-genotype-d-l6-st11-of-pasteurella-multocida-is-likely-to-be-strongly-associated-with-swine-respiratory-disease-in-china
#6
Zhong Peng, Haonan Wang, Wan Liang, Yibao Chen, Xibiao Tang, Huanchun Chen, Bin Wu
Pasteurella multocida is a leading cause of respiratory disease in pigs worldwide. In this study, we determined the genetic characteristics of 115 P. multocida isolates from the lungs of pigs with respiratory disease in China in 2015 using capsular typing, lipopolysaccharide (LPS) genotyping, and virulence genotyping based on the detection of virulence-associated genes. The results showed that the isolates belonged to three capsular types: A (49.6%), D (46.1%), and nontypable (4.3%); and two LPS genotypes: L3 (22...
August 20, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28819786/yeast-caspase-dependent-apoptosis-in-saccharomyces-cerevisiae-by4742-induced-by-antifungal-and-potential-antitumor-agent-clotrimazole
#7
Berna Kavakçıoğlu, Leman Tarhan
Clotrimazole is an antifungal medication commonly used in the treatment of fungal infections. There is also promising research on using clotrimazole against other diseases such as malaria, beriberi, tineapedis and cancer. It was aimed to investigate the apoptotic phenotype in Saccharomyces cerevisiae induced by clotrimazole. The exposure of S. cerevisiae to 10 µM clotrimazole for 3, 6 and 9 h caused to decrease in cell viability by 24.82 ± 0.81, 56.00 ± 1.54 and 77.59 ± 0.53%, respectively. It was shown by Annexin V-PI assay that 110 µM clotrimazole treatment caused to death by 35...
August 17, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28799127/evaluation-of-the-antimicrobial-activity-of-a-blend-of-monoglycerides-against-escherichia-coli-and-enterococci-with-multiple-drug-resistance
#8
Immacolata Anacarso, Andrea Quartieri, Riccardo De Leo, Andrea Pulvirenti
Bacterial antibiotic resistance is a natural phenomenon, seriously affecting the treatment of infections. The biggest danger is that current antibiotics are not able to eradicate the resistant strains. In recent years, alternative antibacterial substances are being sought, which can help in these cases. Fatty acids and monoglycerides are known among the natural substances for their antimicrobial properties and, important detail, bacteria do not develop resistance to them. In this work, we studied the antimicrobial effects of a monoglyceride blend against some multi-resistant Enterococci and Escherichia coli strains...
August 10, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28799031/spirosoma-metallum-sp-nov-isolated-from-an-automobile-air-conditioning-system
#9
Dong-Uk Kim, Hyosun Lee, Suyeon Lee, Sooyeon Park, Jung-Hoon Yoon, So Yoon Park, Jong-Ok Ka
A Gram-stain-negative and yellow-pigmented bacterial strain, designated TX0653(T), was isolated from an automobile evaporator core collected in Korea. The cells were aerobic and rod-shaped. The strain grew at 10-28 °C (optimum, 25 °C), at pH 6.0-7.5 (optimum, 6.5), and in the presence of 0-1% (w/v) NaCl (optimum, 0%). Phylogenetically, the strain was related to members of the genus Spirosoma (95.1-90.8% 16S rRNA sequence similarity) and distantly related to Spirosoma pulveris JSH5-14(T) (95.1%), Spirosoma fluviale MSd3(T) (95...
August 10, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28795230/improved-multiplex-pcr-primers-for-rapid-identification-of-coagulase-negative-staphylococci
#10
Jonguk Kim, Jisoo Hong, Jeong-A Lim, Sunggi Heu, Eunjung Roh
Coagulase-negative staphylococci (CNS) are opportunistic pathogens that are currently emerging as causative agents of human disease. Though CNS are widespread in the clinic and food, their precise identification at species level is important. Here, using 16S rRNA sequencing, 55 staphylococcal isolates were identified as S. capitis, S. caprae, S. epidermidis, S. haemolyticus, S. pasteuri, S. saprophyticus, S. warneri, and S. xylosus. Although 16S rRNA sequencing is universally accepted as a standard for bacterial identification, the method did not effectively discriminate closely related species, and additional DNA sequencing was required...
August 9, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28785779/bioprospecting-marine-actinomycetes-for-multidrug-resistant-pathogen-control-from-rameswaram-coastal-area-tamil-nadu-india
#11
Femina Wahaab, Kalidass Subramaniam
A potent Streptomyces bacillaris strain RAM25C4 was isolated for controlling methicillin-resistant Staphylococcus aureus and multidrug-resistant bacteria such as Staphylococcus aureus, Acinetobacter baumannii, and Pseudomonas aeruginosa. A total of 131 actinomycetes were isolated from the Rameswaram coastal region, Tamil Nadu, India. Among 131 actinomycetes, maximum number of actinomycetes (55%) isolated at the distance of 3-6 m from seashore. Out of 131 actinomycetes, 85% of the actinomycetes exhibited different degree of antagonistic activity against test pathogens...
August 7, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28780591/revealing-strategies-of-quorum-sensing-in-azospirillum-brasilense-strains-ab-v5-and-ab-v6
#12
Josiane Fukami, Julia Laura Fernandes Abrantes, Pablo Del Cerro, Marco Antonio Nogueira, Francisco Javier Ollero, Manuel Megías, Mariangela Hungria
Azospirillum brasilense is an important plant-growth promoting bacterium (PGPB) that requires several critical steps for root colonization, including biofilm and exopolysaccharide (EPS) synthesis and cell motility. In several bacteria these mechanisms are mediated by quorum sensing (QS) systems that regulate the expression of specific genes mediated by the autoinducers N-acyl-homoserine lactones (AHLs). We investigated QS mechanisms in strains Ab-V5 and Ab-V6 of A. brasilense, which are broadly used in commercial inoculants in Brazil...
August 5, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28780590/alpha-ketoglutarate-enhances-freeze-thaw-tolerance-and-prevents-carbohydrate-induced-cell-death-of-the-yeast-saccharomyces-cerevisiae
#13
Maria M Bayliak, Olha V Hrynkiv, Roksolana V Knyhynytska, Volodymyr I Lushchak
Stress resistance and fermentative capability are important quality characteristics of baker's yeast. In the present study, we examined protective effects of exogenous alpha-ketoglutarate (AKG), an intermediate of the tricarboxylic acid cycle and amino acid metabolism, against freeze-thaw and carbohydrate-induced stresses in the yeast Saccharomyces cerevisiae. Growth on AKG-supplemented medium prevented a loss of viability and improved fermentative capacity of yeast cells after freeze-thaw treatment. The cells grown in the presence of AKG had higher levels of amino acids (e...
August 5, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28779470/halomarina-rubra-sp-nov-isolated-from-a-marine-solar-saltern
#14
Yao Zhou, Yang Li, Zhen-Zhen Lü, Heng-Lin Cui
Halophilic archaeal strain ZS-47-S(T) was isolated from Zhoushan marine solar saltern, China. Cells were pleomorphic, stained Gram-negative, and formed red-pigmented colonies on agar plate. Strain ZS-47-S(T) was able to grow at 20-50 °C (optimum 37 °C), at 0.9-4.8 M NaCl (optimum 3.4 M), at 0.005-1.0 M MgCl2 (optimum 0.03 M), and at pH 5.5-9.5 (optimum pH 6.5-7.5). The cells lysed in distilled water and the minimal NaCl concentration to prevent cell-lysis was 5% (w/v). The major polar lipids were C20C20 and C20C25 diether derivatives of phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester, phosphatidylglycerol sulfate, glucosyl mannosyl glucosyl diether, and three unidentified glycolipids...
August 4, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28766036/evaluation-of-the-antimicrobial-activities-of-ultrasonicated-spinach-leaf-extracts-using-rapd-markers-and-electron-microscopy
#15
Ammar Altemimi, Naoufal Lakhssassi, Amer Abu-Ghazaleh, David A Lightfoot
Spinach (Spinacia oleracea L.) leaves represent an important dietary source of nutrients, antioxidants and antimicrobials. As such, spinach leaves play an important role in health and have been used in the treatment of human diseases since ancient times. Here, the aims were to optimize the extraction methods for recovering antimicrobial substances of spinach leaves, determine the minimum inhibitory concentrations (MICs) of the antimicrobial substances against Escherichia coli and Staphylococcus aureus and, finally, evaluate the effects of spinach leaves' antimicrobials on bacterial DNA using central composite face-centered methods...
August 1, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28762063/the-first-report-on-listeria-monocytogenes-producing-siderophores-and-responds-positively-to-n-acyl-homoserine-lactone-ahl-molecules-by-enhanced-biofilm-formation
#16
Milind Mohan Naik, Purva Bhangui, Chinmay Bhat
Listeria monocytogenes are Gram-positive well-known emerging food-borne pathogens causing listeriosis in humans. In the present study, we have isolated biofilm-forming Listeria sp. from utensils used by a local milk collection dairy society at Usgao Goa, which collects milk for Goa dairy. Through biochemical tests and 16S rRNA sequence analysis, the bacterium was confirmed to be L. monocytogenes and designated as strain BN3, having GenBank accession number MF095110. We report for the first time Gram-positive L...
July 31, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28748277/kribbella-sindirgiensis-sp-nov-isolated-from-soil
#17
Fadime Ozdemir-Kocak, Kamil Isik, Salih Saricaoglu, Hayrettin Saygin, Kadriye Inan-Bektas, Demet Cetin, Kiymet Guven, Nevzat Sahin
A Kribbella strain FSN23(T) was isolated from soil sample which was collected from Caygoren Dam lakeside located in Sındırgı, Turkey. The isolate was investigated using a polyphasic approach consisting of numeric, chemotaxonomic and molecular analysis. The isolate indicated chemotaxonomic, morphological and phylogenetic properties associated with members of the genus Kribbella. Phylogenetic analysis based on the 16S rRNA sequence of the strain demonstrated that the strain forms a subclade with K. aluminosa HKI 0478(T) and K...
July 26, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28741076/detection-of-verticillium-species-in-swedish-soils-using-real-time-pcr
#18
Georgios Tzelepis, Sarosh Bejai, Muhammad Naeem Sattar, Arne Schwelm, Jonas Ilbäck, Johan Fogelqvist, Christina Dixelius
Verticillium species are soilborne plant pathogens, responsible for big yield losses worldwide. Here, we report improved procedures to generate DNA from Verticillium species imbedded in farm soils. Using new genomic sequence information, primers for V. dahliae, V. albo-atrum, V. tricorpus, and V. longisporum were designed. In a survey of 429 samples from intensively farmed soil of two Swedish regions, only V. dahliae and V. longisporum were identified. A bias towards V. longisporum (40%) was seen in the south, whereas V...
July 24, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28735377/study-of-the-correlation-between-fengycin-promoter-expression-and-its-production-by-bacillus-subtilis-under-different-culture-conditions-and-the-impact-on-surfactin-production
#19
Yazen Yaseen, Frédérique Gancel, Max Béchet, Djamel Drider, Philippe Jacques
This work aimed to rely expression of the fengycin promoter to fengycin production under different culture conditions. To this end, Bacillus subtilis BBG208, derived from BBG21, which is a fengycin overproducing strain carrying the green fluorescent protein (GFP) under the control of fengycin promoter, was used to assess the effects of different carbon and nitrogen sources on surfactin and fengycin production and the fengycin promoter expression. The data showed that some carbon sources oriented synthesis of one family of lipopeptides, while most of the nitrogen sources allowed high co-production of fengycin and surfactin...
July 22, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28733885/a-simple-and-rapid-in-vitro-test-for-large-scale-screening-of-fungal-endophytes-from-drought-adapted-australian-wild-plants-for-conferring-water-deprivation-tolerance-and-growth-promotion-in-nicotiana-benthamiana-seedlings
#20
Khondoker M G Dastogeer, Hua Li, Krishnapillai Sivasithamparam, Michael G K Jones, Stephen J Wylie
Some fungal endophytes confer novel phenotypes and enhance existing ones in plants, including tolerance to water deprivation stress. A range of fungal endophytes was isolated from wild Nicotiana plants growing in arid parts of northern Australia. These were screened for ability to enhance water deprivation stress tolerance by inoculating seedlings of the model plant N. benthamiana in two in vitro tests. Sixty-eight endophyte isolates were co-cultivated with N. benthamiana seedlings on either damp filter paper or on agar medium before being subjected to water deprivation...
July 21, 2017: Archives of Microbiology
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