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https://www.readbyqxmd.com/read/28440801/dispersal-timing-and-drought-history-influence-the-response-of-bacterioplankton-to-drying-rewetting-stress
#1
Anna J Székely, Silke Langenheder
The extent and frequency of drought episodes is expected to increase in the following decades making it a crucial stress factor for smaller water bodies. However, very little is known about how bacterioplankton is affected by increased evaporation and how these communities reassemble after rewetting. Here, we present results from a microcosm experiment that assessed the effect of drying-rewetting stress on bacterioplankton in the light of the stress history and the rate and timing of dispersal after the rewetting...
April 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28438356/rainfall-increases-the-abundance-of-antibiotic-resistance-genes-within-a-riverine-microbial-community
#2
Andrea Di Cesare, Ester M Eckert, Michela Rogora, Gianluca Corno
Infections with antibiotic resistant bacteria are among the major threats for human health. Studies elucidating the role of the environment in their spread are still in their infancy, it, however, seems that different environments might function as a long-term reservoir of antibiotic resistance genes (ARGs) that reside within their microbial communities. An increasing number of studies target the presence and the persistence of ARGs in waters and soils that are exposed to human activities; they, however, rarely consider the spatial/temporal variability that predominate in these environments...
April 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28438267/the-arsenic-detoxification-system-in-corynebacteria-basis-and-application-for-bioremediation-and-redox-control
#3
Luis M Mateos, Almudena F Villadangos, Alfonso G de la Rubia, Alvaro Mourenza, Laura Marcos-Pascual, Michal Letek, Brandán Pedre, Joris Messens, Jose A Gil
Arsenic (As) is widespread in the environment and highly toxic. It has been released by volcanic and anthropogenic activities and causes serious health problems worldwide. To survive arsenic-rich environments, soil and saprophytic microorganisms have developed molecular detoxification mechanisms to survive arsenic-rich environments, mainly by the enzymatic conversion of inorganic arsenate (As(V)) to arsenite (As(III)) by arsenate reductases, which is then extruded by arsenite permeases. One of these Gram-positive bacteria, Corynebacterium glutamicum, the workhorse of biotechnological research, is also resistant to arsenic...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/28437725/evaluation-of-ecotoxicological-effects-of-benzophenone-uv-filters-luminescent-bacteria-toxicity-genotoxicity-and-hormonal-activity
#4
Qiuya Zhang, Xiaoyan Ma, Mawuli Dzakpasu, Xiaochang C Wang
The widespread use of organic ultraviolet (UV) filters in personal care products raises concerns about their potentially hazardous effects on human and ecosystem health. In this study, the toxicities of four commonly used benzophenones (BPs) UV filters including benzophenone (BP), 2-Hydroxybenzophenone (2HB), 2-Hydroxy-4-methoxybenzophenone (BP3), and 2-Hydroxy-4-methoxybenzophenone-5-sulfonicacid (BP4) in water were assayed in vitro using Vibrio fischeri, SOS/umu assay, and yeast estrogen screen (YES) assay, as well as in vivo using zebrafish larvae...
April 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28437452/enhanced-antibacterial-metabolite-production-through-the-application-of-statistical-methodologies-by-a-streptomyces-nogalater-niist-a30-isolated-from-western-ghats-forest-soil
#5
Jubi Jacob, Reshma Uma Rajendran, Syama Hari Priya, Jayamurthy Purushothaman, Dileep Kumar Bhaskaran Nair Saraswathy Amma
Streptomyces strains isolated from Nelliyampathy forest soil of Western Ghats, Kerala, India were evaluated for their antibacterial efficacy against two indicator pathogenic bacteria (Escherichia coli and Staphylococcus aureus). Among 140 strains tested, sixteen recorded potent antibacterial properties and were further screened against eleven bacterial pathogens. A strain identified as Streptomyces nogalater and designated as NIIST A30 exhibited maximum inhibition against all the test pathogens. Among the eight fermentation media tested, inorganic salts starch broth recorded the best for antibacterial production...
2017: PloS One
https://www.readbyqxmd.com/read/28436821/hydrological-modeling-of-fecal-indicator-bacteria-in-a-tropical-mountain-catchment
#6
Minjeong Kim, Laurie Boithias, Kyung Hwa Cho, Norbert Silvera, Chanthamousone Thammahacksa, Keooudone Latsachack, Emma Rochelle-Newall, Oloth Sengtaheuanghoung, Alain Pierret, Yakov A Pachepsky, Olivier Ribolzi
The occurrence of pathogen bacteria in surface waters is a threat to public health worldwide. In particular, inadequate sanitation resulting in high contamination of surface water with pathogens of fecal origin is a serious issue in developing countries such as Lao P.D.R. Despite the health implications of the consumption of contaminated surface water, the environmental fate and transport of pathogens of fecal origin and their indicators (Fecal Indicator Bacteria or FIB) are still poorly known in tropical areas...
April 15, 2017: Water Research
https://www.readbyqxmd.com/read/28435262/linseed-hydrogel-mediated-green-synthesis-of-silver-nanoparticles-for-antimicrobial-and-wound-dressing-applications
#7
Muhammad Tahir Haseeb, Muhammad Ajaz Hussain, Khawar Abbas, Bahaa Gm Youssif, Sajid Bashir, Soon Hong Yuk, Syed Nasir Abbas Bukhari
Polysaccharides are being extensively employed for the synthesis of silver nanoparticles (Ag NPs) having diverse morphology and applications. Herein, we present a novel and green synthesis of Ag NPs without using any physical reaction conditions. Linseed hydrogel (LSH) was used as a template to reduce Ag(+) to Ag(0). AgNO3 (10, 20, and 30 mmol) solutions were mixed with LSH suspension in deionized water and exposed to diffused sunlight. Reaction was monitored by noting the change in the color of reaction mixture up to 10 h...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28434669/diurnal-variation-of-co2-ch4-and-n2o-emission-fluxes-continuously-monitored-in-situ-in-three-environmental-habitats-in-a-subtropical-estuarine-wetland
#8
Wen-Bin Yang, Chung-Shin Yuan, Chuan Tong, Pin Yang, Lei Yang, Bang-Qin Huang
Wetlands play a crucial role in modulating atmospheric concentrations of greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). The key factors controlling GHG emission from subtropical estuarine wetlands were investigated in this study, which continuously monitored the uptake/emission of GHGs (CO2, CH4, and N2O) by/from a subtropical estuarine wetland located in the Minjiang estuary in the coastal region of southeastern China. A self-designed floating chamber was used to collect air samples on-site at three environmental habitats (Phragmites australis marsh, mudflats, and river water)...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28432320/formation-of-cuo-nano-flowered-surfaces-via-submerged-photo-synthesis-of-crystallites-and-their-antimicrobial-activity
#9
Fumika Nishino, Melbert Jeem, Lihua Zhang, Kazumasa Okamoto, Satoshi Okabe, Seiichi Watanabe
We report the fabrication of flower-like CuO nanostructured surfaces via submerged photo-synthesis of crystallites (SPSC), which requires only UV illumination in neutral water. In this paper, we discuss the reaction mechanism of the photochemical formation of the SPSC-fabricated CuO nanostructures in detail based on surface microstructural analyses and a radiation-chemical consideration with additional gamma-ray irradiation. Since the SPSC method for surface nanostructural fabrication can work at low temperatures at atmospheric pressure without using harmful substances, it is a potential fabrication method for green nanotechnology applications...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28431310/characterization-of-bacterial-communities-of-donkey-milk-by-high-throughput-sequencing
#10
Maria de Los Dolores Soto Del Rio, Alessandra Dalmasso, Tiziana Civera, Maria Teresa Bottero
The interest in donkey milk (DM) is growing because of its functional properties and nutritional value, especially for children with allergies and food intolerances. However, most of the available reports of DM microbiota are based on culture-dependent methods to investigate food safety issues and the presence of lactic acid bacteria (LAB). The aim of this study was to determine the composition of DM bacterial communities using a high-throughput sequencing (HTS) approach. Bulk milk samples from Italian donkey dairy farms from two consecutive years were analysed using the MiSeq Illumina platform...
March 30, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28431143/characterisation-of-the-gill-mucosal-bacterial-communities-of-four-butterflyfish-species-a-reservoir-of-bacterial-diversity-in-coral-reefs-ecosystems
#11
Miriam Reverter, Pierre Sasal, N Tapissier-Bontemps, D Lecchini, Suzuki M
While recent studies have suggested that fish mucus microbiota play an important role in homeostasis and prevention of infections, very few studies have investigated the bacterial communities of gill mucus. We characterised the gill mucus bacterial communities of four butterflyfish species and although the bacterial diversity of gill mucus varied significantly between species, Shannon diversities were high (H = 3.7 - 5.7) in all species. Microbiota composition differed between butterflyfishes, with Chaetodon lunulatus and C...
April 18, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28430024/cacao-phylloplane-the-first-battlefield-against-moniliophthora-perniciosa-the-causal-agent-of-witches-broom-disease
#12
Dayanne Silva Monteiro Almeida, Karina Peres Gramacho, Thyago H Santana Cardoso, Fabienne Micheli, Fátima Cerqueira Alvim, Carlos Priminho Priminho Pirovani
The phylloplane is the first contact surface between Theobroma cacao and the fungus Moniliophthora perniciosa, which causes witches' broom disease (WBD). We evaluated the index of short glandular trichomes (SGTs) in the cacao phylloplane and the effect of irrigation on the disease index of cacao genotypes with/without resistance to WBD, and identified proteins present in the phylloplane. The resistant and susceptible genotype CCN51 and Catongo presented a mean index of 1600 and 700 SGTs•cm-2, respectively...
April 21, 2017: Phytopathology
https://www.readbyqxmd.com/read/28428133/epidemiological-study-of-common-diseases-and-their-risk-factors-in-camels-in-south-punjab-pakistan
#13
Aneela Zameer Durrani, Zubair Bashir, Imran Rasheed, Noor-Ul-Ain Sarwar
Bacteriological study of mastitis along with common blood protozoan diseases were studied in dromedary camels in Cholistan, Dera Ismail Khan and Rahim Yar Khan districts in South Punjab, Pakistan. For this purpose 300 camels were sampled randomly at different common grazing and watering point. For study of blood parasites clinically suspected and apparently healthy camels, 150 each, were sampled. An overall prevalence of 15%and 5% was recorded for trypanosomiasis and Anaplasmosis respectively. Trypanosoma evansi was identified with 280 bp product on polymerase chain reaction test...
April 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28426987/a-review-on-nitrous-oxide-n2o-emissions-during-biological-nutrient-removal-from-municipal-wastewater-and-sludge-reject-water
#14
REVIEW
Theoni Maria Massara, Simos Malamis, Albert Guisasola, Juan Antonio Baeza, Constantinos Noutsopoulos, Evina Katsou
Nitrous oxide (N2O) is an important pollutant which is emitted during the biological nutrient removal (BNR) processes of wastewater treatment. Since it has a greenhouse effect which is 265 times higher than carbon dioxide, even relatively small amounts can result in a significant carbon footprint. Biological nitrogen (N) removal conventionally occurs with nitrification/denitrification, yet also through advanced processes such as nitritation/denitritation and completely autotrophic N-removal. The microbial pathways leading to the N2O emission include hydroxylamine oxidation and nitrifier denitrification, both activated by ammonia oxidizing bacteria, and heterotrophic denitrification...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28425950/diversity-analysis-and-bioresource-characterization-of-halophilic-bacteria-isolated-from-a-south-african-saltpan
#15
Ramganesh Selvarajan, Timothy Sibanda, Memory Tekere, Hlengilizwe Nyoni, Stephen Meddows-Taylor
Though intensive research has been channeled towards the biotechnological applications of halophiles and other extremophilic microbes, these studies have not been, by any means, exhaustive. Saline environments still offer a vast diversity of microbes with potential to produce an array of natural products which can only be unlocked by concerted research efforts. In this study, a combination of culture and molecular approaches were employed to characterize halophilic bacteria from saltpan water samples and profile their potential biotechnological applications...
April 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28425309/laboratory-tests-on-heat-treatment-of-ballast-water-using-engine-waste-heat
#16
Rajoo Balaji, Hing Lee Siang, Omar Yaakob, Kho King Koh, Faizul Amri Bin Adnan, Nasrudin Bin Ismail, Badruzzaman Bin Ahmad, Mohd Arif Bin Ismail, W B Wan Nik
Waste heat recovery from shipboard machineries could be a potential source for heat treatment of ballast water. Similar to a shipboard schematic arrangement, a laboratory-scale engine-heat exchanger set-up harvesting waste heat from jacket water and exhaust gases was erected to test the level of species' mortalities. Mortalities were also assessed under experimental conditions for cultured and natural plankton communities at laboratory level. Effect of pump impellers on species' mortalities were also tested...
April 20, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28424939/characterization-and-complete-genome-sequence-of-a-novel-siphoviridae-bacteriophage-bs5
#17
Xue Meng, Min Wang, Siyuan You, Duobing Wang, Yan Li, Zhaoyang Liu, Yu Gao, Lu Liu, Yaoyuan Zhang, Zhenghao Yan, Chunyan Liu, Yong Jiang, Hongbing Shao
A novel Siphoviridae family Phage BS5, which infects Pseudoalteromonas atlantica, was isolated from the surface waters of the Yellow Sea. Morphological study by transmission electron microscopy revealed that the novel phage belongs to Siphoviridae. The complete genome sequence of PBS5 contained a linear, double-strand 39949-bp DNA molecule with a G + C content of 40.6% and 65 putative open reading frames. Twelve conserved domains were detected by BLASTP in NCBI, and of these the functions of 5 were known...
April 20, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28424678/microbial-and-isotopic-evidence-for-methane-cycling-in-hydrocarbon-containing-groundwater-from-the-pennsylvania-region
#18
Adrien Vigneron, Andrew Bishop, Eric B Alsop, Kellie Hull, Ileana Rhodes, Robert Hendricks, Ian M Head, Nicolas Tsesmetzis
The Pennsylvania region hosts numerous oil and gas reservoirs and the presence of hydrocarbons in groundwater has been locally observed. However, these methane-containing freshwater ecosystems remain poorly explored despite their potential importance in the carbon cycle. Methane isotope analysis and analysis of low molecular weight hydrocarbon gases from 18 water wells indicated that active methane cycling may be occurring in methane-containing groundwater from the Pennsylvania region. Consistent with this observation, multigenic qPCR and gene sequencing (16S rRNA genes, mcrA, and pmoA genes) indicated abundant populations of methanogens, ANME-2d (average of 1...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28424665/ca-similichlamydia-in-epitheliocystis-co-infection-of-gilthead-seabream-gills-unique-morphological-features-of-a-deep-branching-chlamydial-family
#19
Helena M B Seth-Smith, Pantelis Katharios, Nancy Dourala, José M Mateos, Alexander G J Fehr, Lisbeth Nufer, Maja Ruetten, Maricruz Guevara Soto, Lloyd Vaughan
The Planctomycetes-Verrucomicrobia-Chlamydiae (PVC) bacterial superphylum constitutes a broad range of organisms with an intriguing array of ultrastructural morphologies, including intracellular membranes and compartments and their corresponding complex genomes encoding these forms. The phylum Chlamydiae are all obligate intracellular bacteria and, although much is already known of their genomes from various families and how these regulate the various morphological forms, we know remarkably little about what is likely the deepest rooting clade of this phylum, which has only been found to contain pathogens of marine and fresh water vertebrates...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28424662/untangling-genomes-of-novel-planctomycetal-and-verrucomicrobial-species-from-monterey-bay-kelp-forest-metagenomes-by-refined-binning
#20
John Vollmers, Martinique Frentrup, Patrick Rast, Christian Jogler, Anne-Kristin Kaster
The kelp forest of the Pacific temperate rocky marine coastline of Monterey Bay in California is a dominant habitat for large brown macro-algae in the order of Laminariales. It is probably one of the most species-rich, structurally complex and productive ecosystems in temperate waters and well-studied in terms of trophic ecology. However, still little is known about the microorganisms thriving in this habitat. A growing body of evidence suggests that bacteria associated with macro-algae represent a huge and largely untapped resource of natural products with chemical structures that have been optimized by evolution for biological and ecological purposes...
2017: Frontiers in Microbiology
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