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https://www.readbyqxmd.com/read/29785517/optimization-and-enhancement-of-textile-reactive-remazol-black-b-decolorization-and-detoxification-by-environmentally-isolated-ph-tolerant-pseudomonas-aeruginosa-ky284155
#1
Rasha A Hashem, Reham Samir, Tamer M Essam, Amal E Ali, Magdy A Amin
Azo dyes are complex derivatives of diazene used in food and textile manufacture. They are highly recalcitrant compounds, and account for severe environmental and health problems. Different strains of Pseudomonas species were isolated from textile wastewater effluents. The bioconversion of Remazol black B (a commonly used water soluble dye) by Pseudomonas aeruginosa was observed in static conditions. The bio-decolorization process was optimized by a multi factorial Plackett-Burman experimental design. Decolorization of 200 mg L-1 reached 100% in 32 h...
May 21, 2018: AMB Express
https://www.readbyqxmd.com/read/29785352/diversity-and-community-structure-of-marine-microbes-around-the-benham-rise-underwater-plateau-northeastern-philippines
#2
Andrian P Gajigan, Aletta T Yñiguez, Cesar L Villanoy, Maria Lourdes San Diego-McGlone, Gil S Jacinto, Cecilia Conaco
Microbes are central to the structuring and functioning of marine ecosystems. Given the remarkable diversity of the ocean microbiome, uncovering marine microbial taxa remains a fundamental challenge in microbial ecology. However, there has been little effort, thus far, to describe the diversity of marine microorganisms in the region of high marine biodiversity around the Philippines. Here, we present data on the taxonomic diversity of bacteria and archaea in Benham Rise, Philippines, Western Pacific Ocean, using 16S V4 rRNA gene sequencing...
2018: PeerJ
https://www.readbyqxmd.com/read/29783174/facile-isolation-of-%C3%AE-ribazole-from-vitamin-b-12-hydrolysates-using-boronate-affinity-chromatography
#3
Theodoric A Mattes, Jorge C Escalante-Semerena
Alpha-ribazole (α-R) is a unique riboside found in the nucleotide loop of coenzyme B12 (CoB12 ). α-R is not an intermediate of the de novo biosynthetic pathway of coenzyme B12 , but some bacteria of the phylum Firmicutes have evolved a two-protein system (transporter, kinase) that scavenges α-R from the environment and converts it to the pathway intermediate α-RP. Since α-R is not commercially available, one must either synthesize α-R, or isolate it from hydrolysates of vitamin B12 (cyano-B12 , CNB12 ), so the function of the above-mentioned proteins can be studied...
May 16, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29780374/insight-into-the-variation-of-bacterial-structure-in-atrazine-contaminated-soil-regulating-by-potential-phytoremediator-pennisetum-americanum-l-k-schum
#4
Bo Cao, Ying Zhang, Ziyi Wang, Mengyuan Li, Feng Yang, Duo Jiang, Zhao Jiang
Although plants of the genus Pennisetum can accelerate the removal of atrazine from its rhizosphere, the roles played by this plant in adjusting the soil environment and soil microorganism properties that might contribute to pollutant removal are incompletely understood. We selected Pennisetum americanum (L.) K. Schum ( P. americanum ) as the test plant and investigated the interaction between P. americanum and atrazine-contaminated soil, focusing on the adjustment of the soil biochemical properties as well as bacterial functional and community diversity in the rhizosphere using Biolog EcoPlates and high-throughput sequencing of the 16S rRNA gene...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29778035/formation-of-contact-active-antimicrobial-surfaces-by-covalent-grafting-of-quaternary-ammonium-compounds
#5
REVIEW
Poverenov Elena, Klein Miri
Different synthetic strategies for the formation of contact active antimicrobial materials utilizing covalent linkage of quaternary ammonium compounds (QACs) were reviewed. There is a demand to find methods that will prevent bacterial fouling without the release of antimicrobial agents, because biocides cause environment pollution and promote the development of bacteria resistance mechanisms. The contact active antimicrobial surfaces may provide a useful tool for this purpose. The covalent surface grafting of QACs seems to be a feasible and promising approach for the formation of safe and effective antimicrobial materials that could be utilized for medical devices, food industry, water treatment systems and other applications...
May 16, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29776926/occurrence-of-traditional-and-alternative-fecal-indicators-in-tropical-urban-environments-under-different-land-use-patterns
#6
Nazanin Saeidi, Xiaoqiong Gu, Tran Ngoc Han, Shin Giek Goh, Masaaki Kitajima, Ariel Kushmaro, Bradley William Schmitz, Karina Yew-Hoong Gin
This study evaluates the geospatial distribution of fecal indicator bacteria (FIB) (i.e., E. coli , Enterococcus spp.) and the alternative fecal indicator, pepper mild mottle virus (PMMoV), in tropical freshwater environments under different land use patterns. Results show that the occurrence and concentration of microbial fecal indicators was higher for urban-dominated areas than parkland-dominated, consistent with land use weightage. Significant positive correlations with traditional FIB indicate that PMMoV is a suitable indicator of fecal contamination in tropical catchments waters (0...
May 18, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29773926/comparative-analysis-of-airborne-bacteria-and-fungi-in-two-salt-mines-in-poland
#7
Elżbieta Gębarowska, Wojciech Pusz, Jolanta Kucińska, Włodzimierz Kita
The aim of this work was to determine the genera or species composition and the number of colony forming units of airborne bacteria and fungi, respectively, in two salt mines in Poland "Wieliczka" (Lesser Poland) and "Polkowice-Sieroszowice" (Lower Silesia). Both of them are working environments characterized by extreme conditions, and additionally "Wieliczka," officially placed on the UNESCO World Heritage Sites' list, plays a role of tourist attraction. There are also some curative chambers located in this mine...
2018: Aerobiologia
https://www.readbyqxmd.com/read/29768658/detrimental-effects-of-rhizobial-inoculum-early-in-the-life-of-partridge-pea-chamaecrista-fasciculata
#8
Rachel E Pain, Ruth G Shaw, Seema N Sheth
PREMISE OF THE STUDY: Mutualistic relationships with microbes may aid plants in overcoming environmental stressors and increase the range of abiotic environments where plants can persist. Rhizobia, nitrogen-fixing bacteria associated with legumes, often confer fitness benefits to their host plants by increasing access to nitrogen in nitrogen-limited soils, but effects of rhizobia on host fitness under other stresses, such as drought, remain unclear. METHODS: In this greenhouse study, we varied the application of rhizobia (Bradyrhizobium sp...
May 16, 2018: American Journal of Botany
https://www.readbyqxmd.com/read/29766332/ecofriendly-demulsification-of-water-in-oil-emulsions-by-an-efficient-biodemulsifier-producing-bacterium-isolated-from-oil-contaminated-environment
#9
Hoda Sabati, Hossein Motamedi
OBJECTIVE: Water in oil emulsions increase oil processing costs and cause damage to refinery equipment which necessitates demulsification. Since chemical demulsifiers cause environmental pollution, biodemulsifiers have been paid more attention. This study aims to identify biodemulsifier-producing bacteria from petroleum contaminated environments. RESULTS: As a result, several biodemulsifier producing strains were found that Stenotrophomonas sp. strain HS7 (accession number: MF445088) which produced a cell associated biodemulsifier showed the highest demulsifying ratio, 98...
May 15, 2018: Biotechnology Letters
https://www.readbyqxmd.com/read/29765365/human-activity-determines-the-presence-of-integron-associated-and-antibiotic-resistance-genes-in-southwestern-british-columbia
#10
Miguel I Uyaguari-Díaz, Matthew A Croxen, Zhiyao Luo, Kirby I Cronin, Michael Chan, Waren N Baticados, Matthew J Nesbitt, Shaorong Li, Kristina M Miller, Damion Dooley, William Hsiao, Judith L Isaac-Renton, Patrick Tang, Natalie Prystajecky
The dissemination of antibiotic resistant bacteria from anthropogenic sources into the environment poses an emerging public health threat. Antibiotic resistance genes (ARGs) and gene-capturing systems such as integron-associated integrase genes ( intI ) play a key role in alterations of microbial communities and the spread of antibiotic resistant bacteria into the environment. In order to assess the effect of anthropogenic activities on watersheds in southwestern British Columbia, the presence of putative antibiotic resistance and integrase genes was analyzed in the microbiome of agricultural, urban influenced, and protected watersheds...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29762699/cultivable-bacteria-from-pectinatella-magnifica-and-the-surrounding-water-in-south-bohemia-indicate-potential-new-gammaproteobacterial-betaproteobacterial-and-firmicutes-taxa
#11
Hana Salmonová, Jirí Killer, Vera Bunešová, Martina Geigerová, Eva Vlková
Pectinatella magnifica is a freshwater bryozoan, which has become a subject of scientific interest because of its invasive expansion worldwide. To obtain a comprehensive overview of its influence on environments, information on associated bacteria is needed. In this study, cultivable bacteria associated with P. magnifica were investigated. In total, 253 isolates were selected for preliminary identification by MALDI-TOF mass spectrometry and clustered based on REP-PCR profiles. Among these, 169 strains were selected and identified using 16S rRNA gene comparative analyses...
May 14, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29758429/microbial-ecology-of-two-hot-springs-of-sikkim-predominate-population-and-geochemistry
#12
Ishfaq Nabi Najar, Mingma Thundu Sherpa, Sayak Das, Saurav Das, Nagendra Thakur
Northeastern regions of India are known for their floral and faunal biodiversity. Especially the state of Sikkim lies in the eastern Himalayan ecological hotspot region. The state harbors many sulfur rich hot springs which have therapeutic and spiritual values. However, these hot springs are yet to be explored for their microbial ecology. The development of neo generation techniques such as metagenomics has provided an opportunity for inclusive study of microbial community of different environment. The present study describes the microbial diversity in two hot springs of Sikkim that is Polok and Borong with the assist of culture dependent and culture independent approaches...
May 11, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29755425/identification-and-characterization-of-c-di-gmp-metabolic-enzymes-of-leptospira-interrogans-and-c-di-gmp-fluctuations-after-thermal-shift-and-infection
#13
Guohui Xiao, Liangliang Kong, Rongbo Che, Yusi Yi, Qinchao Zhang, Jie Yan, Xu'ai Lin
Leptospirosis is a widespread zoonotic disease caused by pathogenic Leptospira species. The most common species, Leptospira interrogans , can transfer from contaminated soil or water to the human body. It is able to survive these changing environments through sensing and responding to the changes of environmental cues. Cyclic di-GMP (c-di-GMP) is a special secondary messenger in bacteria, which can respond to the environment and regulate diverse bacterial behaviors. The c-di-GMP levels in bacterial cells are regulated by diguanylatecyclases (DGC) and phosphodiesterases (PDE), which are responsible for synthesizing or hydrolyzing c-di-GMP, respectively...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29754736/unrevealing-variation-of-microbial-communities-and-correlation-with-environmental-variables-in-a-full-culture-cycle-of-undaria-pinnatifida
#14
Zelong Zhao, Yongjia Pan, Jingwei Jiang, Shan Gao, Hongjuan Sun, Ying Dong, Pihai Sun, Xiaoyan Guan, Zunchun Zhou
Bacteria are the most abundant organisms in natural environment and dominant drivers of multiple geochemical functions. Drawing a global picture of microbial community structure and understanding their ecological status remain a grand challenge. As a typical artificial process, aquaculture provides a large amount of foods and creates great economic benefits for human beings. However, few studies are aimed at the microbial community in the aquaculture environment of aquatic plants. We analyzed microbial communities from 21 water samples in a coastal aquaculture area during the whole cultural process of Undaria pinnatifida by using high-throughout sequencing of 16S rRNA gene...
May 8, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29752271/microbial-mineral-illization-of-montmorillonite-in-low-permeability-oil-reservoirs-for-microbial-enhanced-oil-recovery
#15
Kai Cui, Shanshan Sun, Meng Xiao, Tongjing Liu, Quanshu Xu, Honghong Dong, Di Wang, Yejing Gong, Te Sha, Jirui Hou, Zhongzhi Zhang, Pengcheng Fu
Microbial mineral illization has been investigated for its role in the extraction and recovery of metals from ores. Here we report our application of mineral bioillization for the microbial enhanced oil recovery in low-permeability oil reservoirs. It aimed to reveal the etching mechanism of the four Fe (III)-reducing microbial strains under anaerobic growth conditions on the Ca-montmorillonite. The mineralogical characterization of the Ca-montmorillonite was performed by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy and energy dispersive spectrometer...
May 11, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29738230/superior-bio-inert-capability-of-zwitterionic-poly-4-vinylpyridine-propylsulfobetaine-withstanding-clinical-sterilization-for-extended-medical-applications
#16
Antoine Venault, Min-Wen Lai, Jheng-Fong Jhong, Chih-Chen Yeh, Lu-Chen Yeh, Yung Chang
The field of bio-inert materials is relatively mature as unique molecular designs for antifouling have been regularly presented over the past 30 years. However, the effect of steam sterilization, a common procedure in hospitals for sterilizing biomedical devices in clinical uses, on the stability of antifouling and hemocompatible biomaterials remains unexplored. The only available set of data indicates that poly(sulfobetaine methacrylate) (SBMA) is unstable and loses its antifouling properties when exposed to hot humid air, depriving it of its attractiveness...
May 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29737382/vermamoeba-vermiformis-a-free-living-amoeba-of-interest
#17
REVIEW
Vincent Delafont, Marie-Helene Rodier, Elodie Maisonneuve, Estelle Cateau
Free-living amoebae are protists that are widely distributed in the environment including water, soil, and air. Although the amoebae of the genus Acanthamoeba are still the most studied, other species, such as Vermamoeba vermiformis (formerly Hartmannella vermiformis), are the subject of increased interest. Found in natural or man-made aquatic environments, V. vermiformis can support the multiplication of other microorganisms and is able to harbor and potentially protect pathogenic bacteria or viruses. This feature is to be noted because of the presence of this thermotolerant amoeba in hospital water networks...
May 8, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29736654/in-depth-molecular-characterization-and-biodegradability-of-water-extractable-organic-nitrogen-in-erhai-lake-sediment
#18
Li Zhang, Shengrui Wang, Jiachun Yang, Kechen Xu
Dissolved organic nitrogen (DON) constitutes a significant fraction of the total dissolved nitrogen content of most aquatic systems and is thus a major nitrogen source for bacteria and phytoplankton. The present work applied Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to a compound-level analysis of the depth-dependent molecular composition of water-extractable organic nitrogen (WEON) in lake sediment. The study focused on Erhai Lake, China. It was found that a large portion (from 16...
May 8, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29731740/evidence-for-environmental-dissemination-of-antibiotic-resistance-mediated-by-wild-birds
#19
Jiao Wu, Ye Huang, Dawei Rao, Yongkui Zhang, Kun Yang
The aquatic bird, egret, could carry antibiotic resistance (AR) from a contaminated waterway (Jin River, Chengdu, China) into the surrounding environment (Wangjianglou Park). A systematic study was carried out on the unique environmental dissemination mode of AR mediated by birds. The minimum inhibitory concentrations of various antibiotics against the environmental Escherichia coli isolates were used to evaluate the bacterial AR at the environmental locations where these isolates were recovered, i.e., the Jin River water, the egret feces, the park soil, and the campus soil...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29728393/maximizing-growth-yield-and-dispersal-via-quorum-sensing-promotes-cooperation-in-vibrio-bacteria
#20
Eric L Bruger, Christopher M Waters
Quorum sensing (QS) is a form of bacterial chemical communication that regulates cellular phenotypes, including certain cooperative behaviors, in response to environmental and demographic changes. Despite the existence of proposed mechanisms that stabilize QS against defector exploitation, it is unclear if or how QS-cooperators can proliferate in populations of mostly defectors in some model systems. We predicted that growth in fragmented subpopulations could allow QS-cooperators to invade a QS-defector population...
May 4, 2018: Applied and Environmental Microbiology
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