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Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]

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https://www.readbyqxmd.com/read/28162954/production-of-docosahexaenoic-acid-by-aurantiochytrium-sp-atcc-pra-276
#1
Valcenir Júnior Mendes Furlan, Victor Maus, Irineu Batista, Narcisa Maria Bandarra
The high costs and environmental concerns associated with using marine resources as sources of oils rich in polyunsaturated fatty acids have prompted searches for alternative sources of such oils. Some microorganisms, among them members of the genus Aurantiochytrium, can synthesize large amounts of these biocompounds. However, various parameters that affect the polyunsaturated fatty acids production of these organisms, such as the carbon and nitrogen sources supplied during their cultivation, require further elucidation...
January 20, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28110805/predictive-modeling-of-pseudomonas-fluorescens-growth-under-different-temperature-and-ph-values
#2
Letícia Dias Dos Anjos Gonçalves, Roberta Hilsdorf Piccoli, Alexandre de Paula Peres, André Vital Saúde
Meat is one of the most perishable foods owing to its nutrient availability, high water activity, and pH around 5.6. These properties are highly conducive for microbial growth. Fresh meat, when exposed to oxygen, is subjected to the action of aerobic psychrotrophic, proteolytic, and lipolytic spoilage microorganisms, such as Pseudomonas spp. The spoilage results in the appearance of slime and off-flavor in food. In order to predict the growth of Pseudomonas fluorescens in fresh meat at different pH values, stored under refrigeration, and temperature abuse, microbial mathematical modeling was applied...
January 4, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28094115/oxidative-stress-and-antioxidant-response-in-a-thermotolerant-yeast
#3
Jorge A Mejía-Barajas, Rocío Montoya-Pérez, Rafael Salgado-Garciglia, Leopoldo Aguilera-Aguirre, Christian Cortés-Rojo, Ricardo Mejía-Zepeda, Melchor Arellano-Plaza, Alfredo Saavedra-Molina
Stress tolerance is a key attribute that must be considered when using yeast cells for industrial applications. High temperature is one factor that can cause stress in yeast. High environmental temperature in particular may exert a natural selection pressure to evolve yeasts into thermotolerant strains. In the present study, three yeasts (Saccharomyces cerevisiae, MC4, and Kluyveromyces marxianus, OFF1 and SLP1) isolated from hot environments were exposed to increased temperatures and were then compared with a laboratory yeast strain...
January 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28089613/high-frequency-of-hepatitis-e-virus-infection-in-swine-from-south-brazil-and-close-similarity-to-human-hev-isolates
#4
Ana Maria Passos-Castilho, Celso Francisco Hernandes Granato
Hepatitis E virus is responsible for acute and chronic liver infections worldwide. Swine hepatitis E virus has been isolated in Brazil, and a probable zoonotic transmission has been described, although data are still scarce. The aim of this study was to investigate the frequency of hepatitis E virus infection in pigs from a small-scale farm in the rural area of Paraná State, South Brazil. Fecal samples were collected from 170 pigs and screened for hepatitis E virus RNA using a duplex real-time RT-PCR targeting a highly conserved 70nt long sequence within overlapping parts of ORF2 and ORF3 as well as a 113nt sequence of ORF2...
January 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28089612/growth-kinetic-models-of-five-species-of-lactobacilli-and-lactose-consumption-in-batch-submerged-culture
#5
Fazlollah Rezvani, Fatemeh Ardestani, Ghasem Najafpour
Kinetic behaviors of five Lactobacillus strains were investigated with Contois and Exponential models. Awareness of kinetic behavior of microorganisms is essential for their industrial process design and scale up. The consistency of experimental data was evaluated using Excel software. L. bulgaricus was introduced as the most efficient strain with the highest biomass and lactic acid yield of 0.119 and 0.602gg(-1) consumed lactose, respectively. The biomass and carbohydrate yield of L. fermentum and L. lactis were slightly less and close to L...
January 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28089161/genome-wide-gene-expression-patterns-in-dikaryon-of-the-basidiomycete-fungus-pleurotus-ostreatus
#6
Tianxiang Liu, Huiru Li, Yatong Ding, Yuancheng Qi, Yuqian Gao, Andong Song, Jinwen Shen, Liyou Qiu
Dikarya is a subkingdom of fungi that includes Ascomycota and Basidiomycota. The gene expression patterns of dikaryon are poorly understood. In this study, we bred a dikaryon DK13×3 by mating monokaryons MK13 and MK3, which were from the basidiospores of Pleurotus ostreatus TD300. Using RNA-Seq, we obtained the transcriptomes of the three strains. We found that the total transcript numbers in the transcriptomes of the three strains were all more than ten thousand, and the expression profile in DK13×3 was more similar to MK13 than MK3...
January 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28081979/malignant-catarrhal-fever-in-brazilian-cattle-presenting-with-neurological-syndrome
#7
Maira de S N Martins, Alessandra M M G de Castro, Michele Dos S Lima, Vivian da S C Pinto, Thaís G da Silva, Claudia Del Fava, Claudio Regis Depes, Liria H Okuda, Edviges M Pituco
Malignant Catarrhal Fever (MCF) was investigated in the central nervous system of cattle with neurological syndrome. Two-hundred-ninety samples were analyzed by histology, and molecular methods to detect ovine herpesvirus type 2 (OvHV-2) were optimized and validated. The qualitative polymerase chain reaction (qualitative PCR) analytical sensitivity was 10(1)DNA copies/μL and found 4.8% (14/290) positive for OvHV-2. The quantitative polymerase chain reaction (qPCR) analytical sensitivity was 10(0)DNA copy/μL and 5...
January 2, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28089614/dark-septate-endophyte-decreases-stress-on-rice-plants
#8
Silvana Gomes Dos Santos, Paula Renata Alves da Silva, Andres Calderin Garcia, Jerri Édson Zilli, Ricardo Luis Louro Berbara
Abiotic stress is one of the major limiting factors for plant development and productivity, which makes it important to identify microorganisms capable of increasing plant tolerance to stress. Dark septate endophytes can be symbionts of plants. In the present study, we evaluated the ability of dark septate endophytes isolates to reduce the effects of water stress in the rice varieties Nipponbare and Piauí. The experiments were performed under gnotobiotic conditions, and the water stress was induced with PEG...
December 27, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28063921/tricalcium-phosphate-solubilization-and-nitrogen-fixation-by-newly-isolated-aneurinibacillus-aneurinilyticus-ckmv1-from-rhizosphere-of-valeriana-jatamansi-and-its-growth-promotional-effect
#9
Anjali Chauhan, Shiwani Guleria, Praveen P Balgir, Abhishek Walia, Rishi Mahajan, Preeti Mehta, Chand Karan Shirkot
Aneurinibacillus aneurinilyticus strain CKMV1 was isolated from rhizosphere of Valeriana jatamansi and possessed multiple plant growth promoting traits like production of phosphate solubilization (260mg/L), nitrogen fixation (202.91nmolethylenemL(-1)h(-1)), indole-3-acetic acid (IAA) (8.1μg/mL), siderophores (61.60%), HCN (hydrogen cyanide) production and antifungal activity. We investigated the ability of isolate CKMV1 to solubilize insoluble P via mechanism of organic acid production. High-performance liquid chromatography (HPLC) study showed that isolate CKMV1 produced mainly gluconic (1...
December 24, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28063922/efficacy-and-safety-of-a-four-drug-fixed-dose-combination-regimen-versus-separate-drugs-for-treatment-of-pulmonary-tuberculosis-a-systematic-review-and-meta-analysis
#10
REVIEW
Glaura C Lima, Emilia V Silva, Pérola de O Magalhães, Janeth S Naves
INTRODUCTION: Tuberculosis, particularly multi-drug-resistant tuberculosis, is a major cause of morbidity and mortality worldwide. To the best of our knowledge, however, no study to date has assessed the combined use of the four available drugs for tuberculosis treatment, which is an issue of great clinical relevance. OBJECTIVE: To determine whether the four-drug fixed-dose combination is safer or more effective than separate drugs for treatment of pulmonary tuberculosis...
December 23, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28130020/helicobacter-pylori-with-east-asian-type-cagpai-genes-is-more-virulent-than-strains-with-western-type-in-some-cagpai-genes
#11
Xiao-Yan Yuan, Jin-Jun Yan, Ya-Chao Yang, Chun-Mei Wu, Yan Hu, Jian-Li Geng
The severity of Helicobacter pylori-related disease is correlated with the presence and integrity of a cag pathogenicity island (cagPAI). cagPAI genotype may have a modifying effect on the pathogenic potential of the infecting strain. After analyzing the sequences of cagPAI genes, some strains with the East Asian-type cagPAI genes were selected for further analysis to examine the association between the diversity of the cagPAI genes and the virulence of H. pylori. The results showed that gastric mucosal inflammatory cell infiltration was significantly higher in patients with East Asian-type cagPAI genes H...
December 22, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28065387/phenol-degradation-and-genotypic-analysis-of-dioxygenase-genes-in-bacteria-isolated-from-sediments
#12
Mengyang Tian, Dongyun Du, Wei Zhou, Xiaobo Zeng, Guojun Cheng
The aerobic degradation of aromatic compounds by bacteria is performed by dioxygenases. To show some characteristic patterns of the dioxygenase genotype and its degradation specificities, twenty-nine gram-negative bacterial cultures were obtained from sediment contaminated with phenolic compounds in Wuhan, China. The isolates were phylogenetically diverse and belonged to 10 genera. All 29 gram-negative bacteria were able to utilize phenol, m-dihydroxybenzene and 2-hydroxybenzoic acid as the sole carbon sources, and members of the three primary genera Pseudomonas, Acinetobacter and Alcaligenes were able to grow in the presence of multiple monoaromatic compounds...
December 22, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28057426/bioethanol-strains-of-saccharomyces-cerevisiae-characterised-by-microsatellite-and-stress-resistance
#13
Vanda Renata Reis, Ana Teresa Burlamaqui Faraco Antonangelo, Ana Paula Guarnieri Bassi, Débora Colombi, Sandra Regina Ceccato-Antonini
Strains of Saccharomyces cerevisiae may display characteristics that are typical of rough-type colonies, made up of cells clustered in pseudohyphal structures and comprised of daughter buds that do not separate from the mother cell post-mitosis. These strains are known to occur frequently in fermentation tanks with significant lower ethanol yield when compared to fermentations carried out by smooth strains of S. cerevisiae that are composed of dispersed cells. In an attempt to delineate genetic and phenotypic differences underlying the two phenotypes, this study analysed 10 microsatellite loci of 22 S...
December 22, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28057425/oral-phaeohyphomycosis-in-a-patient-with-squamocellular-carcinoma-of-the-lip-second-case-report
#14
Suanni Lemos de Andrade, André Ferraz Goiana Leal, Armando Marsden Lacerda Filho, Danielle Patrícia Cerqueira Macêdo, Maria do Carmo Carvalho de Abreu E Lima, Rejane Pereira Neves
This communication reports the second known case of oral phaeohyphomycosis in a patient with squamocellular carcinoma of the lip. The patient, an 82-year-old black woman, a former smoker (for more than 30 years), suffering from an ulcerous vegetative lesion in the middle third of the lower lip for approximately 12 months. The result of the histopathological analysis indicated carcinoma, with well-differentiated keratinized squamous cells and the presence of septate mycelial filaments. In the direct mycological examination, thick and dematiaceous septate mycelial filaments were observed...
December 22, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28108350/molecular-characterization-of-methicillin-resistant-staphylococcus-aureus-isolated-from-blood-in-rio-de-janeiro-displaying-susceptibility-profiles-to-non-%C3%AE-lactam-antibiotics
#15
Alexandra Vidal Pedinotti Zuma, Danielle Ferreira Lima, Ana Paula D'Alincourt Carvalho Assef, Elizabeth Andrade Marques, Robson Souza Leão
The distinction between healthcare-associated MRSA (HA-MRSA) and community-associated MRSA (CA-MRSA) infections has become increasingly blurred. We assessed the molecular characterization and antimicrobial resistance profile for MRSA isolates from blood. Most of all (81.9%) isolates are related to known HA-MRSA and CA-MRSA epidemic lineages, such as, USA300, USA400, USA600, USA800 and USA1100. This is the first multicenter study in Rio de Janeiro.
December 21, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28034596/changes-in-the-microbial-community-during-bioremediation-of-gasoline-contaminated-soil
#16
Aline Jaime Leal, Edmo Montes Rodrigues, Patrícia Lopes Leal, Aline Daniela Lopes Júlio, Rita de Cássia Rocha Fernandes, Arnaldo Chaer Borges, Marcos Rogério Tótola
We aimed to verify the changes in the microbial community during bioremediation of gasoline-contaminated soil. Microbial inoculants were produced from successive additions of gasoline to municipal solid waste compost (MSWC) previously fertilized with nitrogen-phosphorous. To obtain Inoculant A, fertilized MSWC was amended with gasoline every 3 days during 18 days. Inoculant B received the same application, but at every 6 days. Inoculant C included MSWC fertilized with N-P, but no gasoline. The inoculants were applied to gasoline-contaminated soil at 10, 30, or 50g/kg...
December 19, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/27998673/production-of-recombinant-human-epidermal-growth-factor-in-pichia-pastoris
#17
Samira Eissazadeh, Hassan Moeini, Maryam Ghandizadeh Dezfouli, Somayyeh Heidary, Rubina Nelofer, Mohd Puad Abdullah
This study was carried out to express human epidermal growth factor (hEGF) in Pichia pastoris GS115. For this aim, the hEGF gene was cloned into the pPIC9K expression vector, and then integrated into P. pastoris by electroporation. ELISA-based assay showed that the amount of hEGF secreted into the medium can be affected by the fermentation conditions especially by culture medium, pH and temperature. The best medium for the optimal hEGF production was BMMY buffered at a pH range of 6.0 and 7.0. The highest amount of hEGF with an average yield of 2...
December 17, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28034597/draft-genome-sequence-of-a-multidrug-resistant-beta-lactamase-oxa-357-producing-acinetobacter-pittii-st865-clinical-isolate-from-china
#18
Jianfeng Wang, Yan Chen, Liyan Wu, Yu Chen, Liqun Xu
Worldwide increasing emergence of carbapenem-resistant Acinetobacter spp. has rendered the limited availability of effective antimicrobial agents and has become a major public health concern. In this study, we report the draft genome sequence of A. pittii TCM156, a multidrug-resistant isolate that harbored the blaOXA-357 gene. The genome sequence was further analyzed by various bioinformatics methods. The genome size was estimated to be 3,807,313bp with 3508 predicted coding regions and G+C content is 38.7%...
December 14, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28017289/draft-genome-of-nocardia-farcinica-trh1-a-linear-and-polycyclic-aromatic-hydrocarbon-degrading-bacterium-isolated-from-the-coast-of-trindade-island-brazil
#19
Edmo M Rodrigues, Pedro Marcus P Vidigal, Victor S Pylro, Daniel K Morais, Laura Rabelo Leite, Luiz F W Roesch, Marcos R Tótola
Here, we report the draft genome sequence and annotation of Nocardia farcinica TRH1, a petroleum hydrocarbons degrading Actinobacteria isolated from the coastal water of Trindade Island, Brazil.
December 10, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28041840/genome-sequencing-of-four-strains-of-phylotype-i-ii-and-iv-of-ralstonia-solanacearum-that-cause-potato-bacterial-wilt-in-india
#20
Virupaksh U Patil, Vanishree Girimalla, Vinay Sagar, Rajinder Singh Chauhan, Swarup Kumar Chakrabarti
Ralstonia solanacearum is a heterogeneous species complex causing bacterial wilts in more than 450 plant species distributed in 54 families. The complexity of the genome and the wide diversity existing within the species has led to the concept of R. solanacearum species complex (RsSC). Here we report the genome sequence of the four strains (RS2, RS25, RS48 and RS75) belonging to three of the four phylotypes of R. solanacearum that cause potato bacterial wilt in India. The genome sequence data would be a valuable resource for the evolutionary, epidemiological studies and quarantine of this phytopathogen...
December 8, 2016: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
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