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World Journal of Microbiology & Biotechnology

Zhen Kang, Wenwen Ding, Xu Gong, Qingtao Liu, Guocheng Du, Jian Chen
5-Aminolevulinic acid (5-ALA) is the precursor for the biosynthesis of tetrapyrrole compounds and has broad applications in the medical and agricultural fields. Because of the disadvantages of chemical synthesis methods, microbial production of 5-ALA has drawn intensive attention and has been regarded as an alternative in the last years, especially with the rapid development of metabolic engineering and synthetic biology. In this mini-review, recent advances on the application and microbial production of 5-ALA using novel biological approaches (such as whole-cell enzymatic-transformation, metabolic pathway engineering and cell-free process) are described and discussed in detail...
October 16, 2017: World Journal of Microbiology & Biotechnology
Maike Lenz, Niels Borlinghaus, Leonie Weinmann, Bettina M Nestl
Imine reductases are nicotinamide-dependent enzymes that catalyze the asymmetric reduction of various imines to the corresponding amine products. Owing to the increasing roles of chiral amines and heterocyclic compounds as intermediates for pharmaceuticals, the demand for novel selective synthesis strategies is vitally important. Recent studies have demonstrated the discovery and structural characterization of a number of stereoselective imine reductase enzymes. Here, we highlight recent progress in applying imine reductases for the formation of chiral amines and heterocycles...
October 11, 2017: World Journal of Microbiology & Biotechnology
Viviana Urtuvia, Nataly Maturana, Fernando Acevedo, Carlos Peña, Alvaro Díaz-Barrera
Alginate is a linear polysaccharide that can be used for different applications in the food and pharmaceutical industries. These polysaccharides have a chemical structure composed of subunits of (1-4)-β-D-mannuronic acid (M) and its C-5 epimer α-L-guluronic acid (G). The monomer composition and molecular weight of alginates are known to have effects on their properties. Currently, these polysaccharides are commercially extracted from seaweed but can also be produced by Azotobacter vinelandii and Pseudomonas spp...
October 7, 2017: World Journal of Microbiology & Biotechnology
Oluwaseyi Samuel Olanrewaju, Bernard R Glick, Olubukola Oluranti Babalola
The idea of eliminating the use of fertilizers which are sometimes environmentally unsafe is slowly becoming a reality because of the emergence of microorganisms that can serve the same purpose or even do better. Depletion of soil nutrients through leaching into the waterways and causing contamination are some of the negative effects of these chemical fertilizers that prompted the need for suitable alternatives. This brings us to the idea of using microbes that can be developed for use as biological fertilizers (biofertilizers)...
October 6, 2017: World Journal of Microbiology & Biotechnology
Nicole Werner, Susanne Zibek
Long-chain α,ω-dicarboxylic acids (DCAs) are versatile chemical intermediates of industrial importance used as building blocks for the production of polymers, lubricants, or adhesives. The majority of industrial long-chain DCAs is produced from petro-chemical resources. An alternative is their biotechnological production from renewable materials like plant oil fatty acids by microbial fermentation using oleogenious yeasts. Oleogenious yeasts are natural long-chain DCA producers, which have to be genetically engineered for high-yield DCA production...
October 5, 2017: World Journal of Microbiology & Biotechnology
Diego Cunha Zied, Fernanda Aparecida Dourado, Eustáquio Souza Dias, Arturo Pardo-Giménez
The use of fungicides is common in mushroom cultivation, but no study was carried out applying reduced doses of fungicides in order to increase yield, taking account the hormesis effect. The aim of this manuscript was to verify the effects of different concentrations of fungicides to stimulate the productivity of different strains of Agaricus bisporus. Two stages were developed, an in vitro study to define the best concentration to be applied in the second experiment an agronomic study, which consisted of the application of the selected fungicides, in their respective concentrations, in an experiment carried out in the mushroom chamber...
October 5, 2017: World Journal of Microbiology & Biotechnology
Olayide Obidi, Foluke Okekunjo
Microbial induced discolorations are an unsightly feature occurring on painted walls in Lagos, the commercial hub of Nigeria. Very few studies have been carried out conventionally about the microbial community structure of discolored painted walls in Nigeria therefore, knowledge of the true microbial diversity is elusive. To further our understanding of the phylogenetic diversity of representative microbial community on 40 discolored and three clean-looking buildings, a comparative DNA sequence analysis of 16S rDNA genes was undertaken...
October 5, 2017: World Journal of Microbiology & Biotechnology
Muhammad Bilal, Shuqi Guo, Hafiz M N Iqbal, Hongbo Hu, Wei Wang, Xuehong Zhang
Pseudomonas strains are increasingly attracting considerable attention as a valuable bacterial host both for basic and applied research. It has been considered as a promising candidate to produce a variety of bioactive secondary metabolites, particularly phenazines. Apart from the biotechnological perspective, these aromatic compounds have the notable potential to inhibit plant-pathogenic fungi and thus are useful in controlling plant diseases. Nevertheless, phenazines production is quite low by the wild-type strains that necessitated its yield improvement for large-scale agricultural applications...
October 3, 2017: World Journal of Microbiology & Biotechnology
Łukasz Wajda, Aleksandra Duda-Chodak, Tomasz Tarko, Paweł Kamiński
Current study was focused on optimising lead(II) biosorption carried out by living cells of Arthrospira platensis using Principal Component Analysis. Various experimental conditions were considered: initial metal concentration (50 and 100 mg/l), solution pH (4.0, 4.5, 5.0, 5.5) and contact time (10, 20, 30, 40, 50 and 60 min) at constant rotary speed 200 rpm. It was found that when the biomass was separated from experimental solutions by the filtration, almost 50% of initial metal dose was removed by the filter paper...
October 3, 2017: World Journal of Microbiology & Biotechnology
Man Zhou, Jingli Wu, Tao Wang, Lina Gao, Huijun Yin, Xin Lü
Pectinase is an important kind of enzyme with many industrial applications, among which pectinases produced by bacteria were scarce compared with fungal sources. In this study, a novel bacterium which produced extracellular pectinase was firstly isolated from flue-cured tobacco leaves and identified as Bacillus subtilis PB1 according to its 16S rRNA gene. The pectinolytic enzyme was purified by ammonium sulfate precipitation, ion-exchange and gel filtration chromatography, after which molecular weight was determined as 43...
October 3, 2017: World Journal of Microbiology & Biotechnology
Kapilesh Jadhav, Indrani Jadhav
Achromobacter xylosoxidans is a versatile bacterium known for its ability to degrade aromatic compounds. However, its ability to oxidize sulfur compounds for electron and energy source is not reported much. In the present work, the Gram-negative bacterium Achromobacter xylosoxidans strain wsp05 isolated from a waste stabilization ponds (WSPs) system was studied for its ability to oxidize reduced sulfur compounds. The strain was able to oxidize thiosulfate and sodium sulfite. To observe the effect of physicochemical parameters on the rate of sulfur oxidation, strain wsp05 was grown in thiosulfate (20 mM) containing minimal salt medium at varied pH, temperature and ammonium and phosphate ions concentration...
October 3, 2017: World Journal of Microbiology & Biotechnology
Tina Nafarieh, Mojgan Bandehpour, Ali Hashemi, Sodabeh Taheri, Vahid Yardel, Hamidreza Jamaati, Seyed Mahdi Moosavi, Nariman Mosaffa
Nosocomial infections with a bacterial origin are considered one of the most dangerous threats to global health. Among the causes of these infections, Acinetobacter baumannii is playing a significant role, and the present study aimed‏ to determine the immunogenic proteins of this bacteria. Clinical isolates of A. baumannii were obtained from positive sputum cultures of intensive care unit (ICU) patients confirmed by Polymerase chain reaction (PCR) of the OXA-51 gene, and sera was obtained from 20 colonized patients...
September 30, 2017: World Journal of Microbiology & Biotechnology
Ines Lačanin, Jérôme Mounier, Audrey Pawtowski, Marta Dušková, Josef Kameník, Renáta Karpíšková
Fungi are commonly involved in dairy product spoilage and the use of bioprotective cultures can be a complementary approach to reduce food waste and economic losses. In this study, the antifungal activity of 89 Lactobacillus and 23 Pediococcus spp. isolates against three spoilage species, e.g., Yarrowia lipolytica, Rhodotorula mucilaginosa and Penicillium brevicompactum, was first evaluated in milk agar. None of the tested pediococci showed antifungal activity while 3, 23 and 43 lactobacilli isolates showed strong antifungal activity or total inhibition against Y...
September 30, 2017: World Journal of Microbiology & Biotechnology
Gabriel Quintana, Maria V Niederle, Carlos J Minahk, Gianluca Picariello, María E F Nader-Macías, Sergio E Pasteris
Lactococcus lactis subsp. lactis CRL 1584 isolated from a bullfrog hatchery produces a bacteriocin that inhibits both indigenous Citrobacter freundii (a Red-Leg Syndrome related pathogen) and Lactobacillus plantarum, and Listeria monocytogenes as well. Considering that probiotics requires high cell densities and/or bacteriocin concentrations, the effect of the temperature on L. lactis growth and bacteriocin production was evaluated to find the optimal conditions. Thus, the growth rate was maximal at 36 °C, whereas the highest biomass and bacteriocin activity was achieved between 20 and 30 °C and 20-25 °C, respectively...
September 27, 2017: World Journal of Microbiology & Biotechnology
Jeyaraman Thirumalairaj, Karikalacholan Sivasankari, Kalimuthusamy Natarajaseenivasan, Ramasamy Balagurunathan
Leptospirosis is a worldwide reemerging tropical zoonotic disease with symptoms of mild febrile illness to more severe multiple organ failure caused by pathogenic leptospiral strains. There was no effective antibiotic for treating leptospirosis. Here, the anti-leptospiral potential of marine actinobacterial compound from Streptomyces indiaensis MSU5 isolated from Manakudy marine sediment, Tamil Nadu, India was evaluated. The potential actinobacterial strain was identified by phenotypic, cell wall, 16S rRNA gene sequence and phylogenetic analysis...
September 27, 2017: World Journal of Microbiology & Biotechnology
Ralf Lopes, Louise Cerdeira, Grace S Tavares, Jeronimo C Ruiz, Jochen Blom, Elvira C A Horácio, Hilário C Mantovani, Marisa Vieira de Queiroz
Diseases caused by phytopathogenic microorganisms account for enormous losses for agribusiness. Although Bacillus species are recognized as being antimicrobial producers and some may provide benefits to plants, the association between Bacillus toyonensis and plants has not been studied. In this study, the whole-genome sequenced endophytic B. toyonensis BAC3151, which has demonstrated antimicrobial activity and quorum sensing inhibition of phytopathogenic bacteria, was investigated for its potential for the production of compounds for biocontrol of plant pathogens...
September 25, 2017: World Journal of Microbiology & Biotechnology
Jian Zhang, Jie Yuan, Wen-Xue Zhang, Wen-You Zhu, Fang Tu, Ya Jiang, Chuan-Ze Sun
This paper reports an effective process for converting soy sauce residue into feeds by combining moderate acid hydrolysis and ammonization with Rhodospirillum rubrum fermentation. After pretreatment with dilute sulfuric or phosphoric acid (1%, w/w) at 100 °C, materials were subjected to fermentation under several gases (N2, CO2, and air) and different light intensities in a 2-L fermentor. Following sulfuric acid treatment, the true protein increased from 188 to 362 g kg(-1) and the crude fiber decreased from 226 to 66 g kg(-1) after fermentation at 0...
September 25, 2017: World Journal of Microbiology & Biotechnology
Xing Xiao, Jiao Feng, Yu Li, Zhiwen Chen, Minglan Shi, Liyan Xi, Eleftherios Mylonakis, Junmin Zhang
Talaromyces marneffei causes life-threatening infections in immunocompromised hosts. An efficient tool for genetic manipulation of T. marneffei will allow for increased understanding of this thermally dimorphic fungus. Agrobacterium tumefaciens-mediated transformation (ATMT) was optimized for targeted gene disruption in T. marneffei using the plasmid pDHt/acuD::pyrG. Molecular analyses of transformants were performed by PCR, Southern blot and semi-quantitative RT-PCR. A. tumefaciens strain EHA105 was more efficient at transformation than strain AGL-1 in ATMT via solid co-cultivation...
September 25, 2017: World Journal of Microbiology & Biotechnology
Tao Yang, Serge Maurice Mbadinga, Lei Zhou, Shi-Zhong Yang, Jing-Feng Liu, Ji-Dong Gu, Bo-Zhong Mu
Propionate is a common metabolic intermediate occurring in environmental samples including petroleum reservoirs. Available microbial genomes were obtained from the NCBI database and analyzed in silico by hmmscan to check three metabolic pathways of propionate production in petroleum reservoir systems. The succinate pathway was the dominant one while the other two (lactate and 1,2-propanediol pathways) contributed less to the formation of propionate according to the Hidden Markov Model calculation. The mmdA gene encoding methylmalonyl-CoA decarboxylase was used as a biomarker gene to detect the diversity of microbes involved in the propionate formation in Jiangsu oil reservoirs...
September 23, 2017: World Journal of Microbiology & Biotechnology
Paula Andrea Rojas-Pinzón, Jenny Dussán
Given its toxicity against culicid larvae, Lysinibacillus sphaericus is used for the biological control of mosquitoes such as Culex sp. and Anopheles sp. The toxicity factors currently reported for L. sphaericus include the Binary toxin, Mtx toxins, and the S-layer. However, Aedes aegypti is refractory to the Binary toxin, the most toxic larvicidal protein of L. sphaericus. Until now, there are no evidences of the hemolytic and chitinolytic capacity of L. sphaericus. Herein, the expression of the hemolysin D (hlyD) and the chitin-binding protein genes of L...
September 22, 2017: World Journal of Microbiology & Biotechnology
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