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https://www.readbyqxmd.com/read/28330314/bioremediation-of-heavy-metals-using-an-endophytic-bacterium-paenibacillus-sp-rm-isolated-from-the-roots-of-tridax-procumbens
#1
M Govarthanan, R Mythili, T Selvankumar, S Kamala-Kannan, A Rajasekar, Young-Cheol Chang
The aim of the present study was to assess the bioremediation potential of endophytic bacteria isolated from roots of Tridax procumbens plant. Five bacterial endophytes were isolated and subsequently tested for minimal inhibitory concentration (MIC) against different heavy metals. Amongst the five isolates, strain RM exhibited the highest resistance to copper (750 mg/l), followed by zinc (500 mg/l), lead (450 mg/l), and arsenic (400 mg/l). Phylogenetic analysis of the 16S rDNA sequence suggested that strain RM was a member of genus Paneibacillus...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330194/exploited-application-of-sulfate-reducing-bacteria-for-concomitant-treatment-of-metallic-and-non-metallic-wastes-a-mini-review
#2
REVIEW
Ali Hussain, Ali Hasan, Arshad Javid, Javed Iqbal Qazi
A variety of multidimensional anthropogenic activities, especially of industrial level, are contaminating our aquatic and terrestrial environments with a variety of metallic and non-metallic pollutants. The metallic and non-metallic pollutants addressed specifically in this review are heavy metals and various compound forms of sulfates, respectively. Direct and indirect deleterious effects of the both types of pollutants to all forms of life are well-known. The treatment of such pollutants is therefore much necessary before their final discharge into the environment...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330116/novel-pathway-of-cypermethrin-biodegradation-in-a-bacillus-sp-strain-sg2-isolated-from-cypermethrin-contaminated-agriculture-field
#3
Pankaj, Anita Sharma, Saurabh Gangola, Priyanka Khati, Govind Kumar, Anjana Srivastava
Pesticides belonging to pyrethroid group are widely used in agricultural fields to check pest infestation in different crops for enhanced food production. In spite of beneficial effects, non-judicious use of pesticides imposes harmful effect on human health as their residues reach different food materials and ground water via leaching, percolation and bioaccumulation. Looking into the potential of microbial degradation of toxic compounds under natural environment, a cypermethrin-degrading Bacillus sp. was isolated from pesticide-contaminated soil of a rice field of Distt...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329706/exposure-to-bacterial-cpg-dna-protects-from-airway-allergic-inflammation-by-expanding-regulatory-lung-interstitial-macrophages
#4
Catherine Sabatel, Coraline Radermecker, Laurence Fievez, Genevieve Paulissen, Svetoslav Chakarov, Claudia Fernandes, Sabine Olivier, Marie Toussaint, Dimitri Pirottin, Xue Xiao, Pascale Quatresooz, Jean-Claude Sirard, Didier Cataldo, Laurent Gillet, Hicham Bouabe, Christophe J Desmet, Florent Ginhoux, Thomas Marichal, Fabrice Bureau
Living in a microbe-rich environment reduces the risk of developing asthma. Exposure of humans or mice to unmethylated CpG DNA (CpG) from bacteria reproduces these protective effects, suggesting a major contribution of CpG to microbe-induced asthma resistance. However, how CpG confers protection remains elusive. We found that exposure to CpG expanded regulatory lung interstitial macrophages (IMs) from monocytes infiltrating the lung or mobilized from the spleen. Trafficking of IM precursors to the lung was independent of CCR2, a chemokine receptor required for monocyte mobilization from the bone marrow...
March 21, 2017: Immunity
https://www.readbyqxmd.com/read/28328707/the-sterility-of-partially-used-hyaluronic-acid-fillers-after-long-storage
#5
Mohammed Al-Haddab, Amr Abduljabbar, Ali Al-Somaily
BACKGROUND: Hyaluronic acid (HA) gel fillers represent most soft tissue augmentation procedures currently used, because they have lower rates of complications compared with other materials. Many patients do not consume an entire syringe of filler but may require a retouch or intermittent augmentation after some time. The remaining material is commonly stored in a specific environment for reuse by the same patient. OBJECTIVE: There are an insufficient number of recommendations concerning the safety of storing and reusing dermal fillers in the literature because of the paucity of studies...
March 21, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28326437/steady-state-oxygen-isotope-effects-of-n2o-production-in-paracoccus-denitrificans
#6
Carol Barford, Joseph Montoya, Mark Altabet, Ralph Mitchell
Knowledge of isotopic discrimination, or fractionation, by denitrifying bacteria can benefit agricultural fertilizer management, wastewater treatment, and other applications. However, the complexity of N transformation pathways in the environment and the sensitivity of denitrification to environmental conditions warrant better isotopic distinction between denitrification and other processes, especially for oxygen isotopes. Here, we present a dataset of δ(18)O measurements in continuous culture of Paracoccus denitrificans...
March 21, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28326079/differences-in-ureolytic-bacterial-composition-between-the-rumen-digesta-and-rumen-wall-based-on-urec-gene-classification
#7
Di Jin, Shengguo Zhao, Nan Zheng, Dengpan Bu, Yves Beckers, Stuart E Denman, Christopher S McSweeney, Jiaqi Wang
Ureolytic bacteria are key organisms in the rumen producing urease enzymes to catalyze the breakdown of urea to ammonia for the synthesis of microbial protein. However, little is known about the diversity and distribution of rumen ureolytic microorganisms. The urease gene (ureC) has been the target gene of choice for analysis of the urea-degrading microorganisms in various environments. In this study, we investigated the predominant ureC genes of the ureolytic bacteria in the rumen of dairy cows using high-throughput sequencing...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28326078/inside-out-archaeal-ectosymbionts-suggest-a-second-model-of-reduced-genome-evolution
#8
REVIEW
Trevor Nicks, Lilah Rahn-Lee
Reduced-genome symbionts and their organelle counterparts, which have even smaller genomes, are essential to the lives of many organisms. But how and why have these genomes become so small? Endosymbiotic genome reduction is a product of isolation within the host, followed by massive pseudogenization and gene loss often including DNA repair mechanisms. This phenomenon can be observed in insect endosymbionts such as the bacteria Carsonella ruddii and Buchnera aphidicola. Yet endosymbionts are not the only organisms with reduced genomes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28326069/different-bacterial-communities-involved-in-peptide-decomposition-between-normoxic-and-hypoxic-coastal-waters
#9
Shuting Liu, Boris Wawrik, Zhanfei Liu
Proteins and peptides are key components of the labile dissolved organic matter pool in marine environments. Knowing which types of bacteria metabolize peptides can inform the factors that govern peptide decomposition and further carbon and nitrogen remineralization in marine environments. A (13)C-labeled tetrapeptide, alanine-valine-phenylalanine-alanine (AVFA), was added to both surface (normoxic) and bottom (hypoxic) seawater from a coastal station in the northern Gulf of Mexico for a 2-day incubation experiment, and bacteria that incorporated the peptide were identified using DNA stable isotope probing (SIP)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28325762/a-genetic-screen-reveals-that-synthesis-of-1-4-dihydroxy-2-naphthoate-dhna-but-not-full-length-menaquinone-is-required-for-listeria-monocytogenes-cytosolic-survival
#10
Grischa Y Chen, Courtney E McDougal, Marc A D'Antonio, Jonathan L Portman, John-Demian Sauer
Through unknown mechanisms, the host cytosol restricts bacterial colonization; therefore, only professional cytosolic pathogens are adapted to colonize this host environment. Listeria monocytogenes is a Gram-positive intracellular pathogen that is highly adapted to colonize the cytosol of both phagocytic and nonphagocytic cells. To identify L. monocytogenes determinants of cytosolic survival, we designed and executed a novel screen to isolate L. monocytogenes mutants with cytosolic survival defects. Multiple mutants identified in the screen were defective for synthesis of menaquinone (MK), an essential molecule in the electron transport chain...
March 21, 2017: MBio
https://www.readbyqxmd.com/read/28324231/occurrence-and-virulence-properties-of-vibrio-and-salinivibrio-isolates-from-tropical-lagoons-of-the-southern-caribbean-sea
#11
Milagro Fernández-Delgado, Paula Suárez, Sandra Giner, Virginia Sanz, Jessy Peña, Damarys Sánchez, M Alexandra García-Amado
The Vibrionaceae are Gram-negative bacteria present in marine and estuarine environments worldwide, including several species known as important pathogens to humans and aquatic organisms. The aim of this research was to investigate the occurrence and virulence properties of Vibrio and Salinivibrio isolated from lagoons at Cuare Wildlife Refuge and Margarita Island in the southern Caribbean Sea. Water, plankton and oyster samples were collected during October 2011 and March 2012 and examined by specific PCR and culture methods...
March 21, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28323618/contact-dependent-killing-by-caulobacter-crescentus-via-cell-surface-associated-glycine-zipper-proteins
#12
Leonor Garcia-Bayona, Monica S Guo, Michael T Laub
Most bacteria are in fierce competition with other species for limited nutrients. Some bacteria can kill nearby cells by secreting bacteriocins, a diverse group of proteinaceous antimicrobials. However, bacteriocins are typically freely diffusible, and so of little value to planktonic cells in aqueous environments. Here, we identify an atypical two-protein bacteriocin in the α-proteobacterium Caulobacter crescentus that is retained on the surface of producer cells where it mediates cell contact-dependent killing...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28323456/stratosphere-conditions-inactivate-bacterial-endospores-from-a-mars-spacecraft-assembly-facility
#13
Christina L Khodadad, Gregory M Wong, Leandro M James, Prital J Thakrar, Michael A Lane, John A Catechis, David J Smith
Every spacecraft sent to Mars is allowed to land viable microbial bioburden, including hardy endospore-forming bacteria resistant to environmental extremes. Earth's stratosphere is severely cold, dry, irradiated, and oligotrophic; it can be used as a stand-in location for predicting how stowaway microbes might respond to the martian surface. We launched E-MIST, a high-altitude NASA balloon payload on 10 October 2015 carrying known quantities of viable Bacillus pumilus SAFR-032 (4.07 × 10(7) spores per sample), a radiation-tolerant strain collected from a spacecraft assembly facility...
March 21, 2017: Astrobiology
https://www.readbyqxmd.com/read/28321827/effects-of-dietary-administration-of-shewanella-xiamenensis-a-1-aeromonas-veronii-a-7-and-bacillus-subtilis-single-or-combined-on-the-grass-carp-ctenopharyngodon-idella-intestinal-microbiota
#14
Kai Hao, Zhuo-Qi Wu, Dong-Liang Li, Xiao-Bo Yu, Gao-Xue Wang, Fei Ling
Gut microbiota of grass carp plays an important role in host. However, detailed information regarding the changes of microbiota after probiotics administration in relation to the gastrointestinal microbiota is absent. In the present study, dietary administration of putative probiotics Shewanella xiamenensis A-1, Aeromonas veronii A-7, and Bacillus subtilisstrains was conducted in grass carp to investigate if there is a discernible alteration in intestinal microbiota and whether the alteration is associated with previous study about the immunity regulation in grass carp...
March 21, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28321487/benzene-degradation-in-a-denitrifying-biofilm-reactor-activity-and-microbial-community-composition
#15
Marcelle J van der Waals, Siavash Atashgahi, Ulisses Nunes da Rocha, Bas M van der Zaan, Hauke Smidt, Jan Gerritse
Benzene is an aromatic compound and harmful for the environment. Biodegradation of benzene can reduce the toxicological risk after accidental or controlled release of this chemical in the environment. In this study, we further characterized an anaerobic continuous biofilm culture grown for more than 14 years on benzene with nitrate as electron acceptor. We determined steady state degradation rates, microbial community composition dynamics in the biofilm, and the initial anaerobic benzene degradation reactions...
March 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28321417/technologies-for-proteome-wide-discovery-of-extracellular-host-pathogen-interactions
#16
REVIEW
Nadia Martinez-Martin
Pathogens have evolved unique mechanisms to breach the cell surface barrier and manipulate the host immune response to establish a productive infection. Proteins exposed to the extracellular environment, both cell surface-expressed receptors and secreted proteins, are essential targets for initial invasion and play key roles in pathogen recognition and subsequent immunoregulatory processes. The identification of the host and pathogen extracellular molecules and their interaction networks is fundamental to understanding tissue tropism and pathogenesis and to inform the development of therapeutic strategies...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28321229/phycospheric-native-bacteria-pelagibaca-bermudensis-and-stappia-sp-ameliorate-biomass-productivity-of-tetraselmis-striata-kctc1432bp-in-co-cultivation-system-through-mutualistic-interaction
#17
Jungsoo Park, Bum Soo Park, Pengbin Wang, Shailesh K Patidar, Jin Ho Kim, Sae-Hee Kim, Myung-Soo Han
Effective sustainable algal cultivation techniques are essential for mass production of the marine microalga Tetraselmis for biofuel and array of co-products. The phycospheric communities affect the microalgal growth and metabolism through various allelochemical and nutrient interactions; hence, their potential to affect the quantity and quality of both biomass and bioproducts is significant. In the present study, we have screened the phycospheric communities of biofuel producing Tetraselmis striata (KCTC1432BP)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28321007/diversity-of-ktedonobacteria-with-actinomycetes-like-morphology-in-terrestrial-environments
#18
Shuhei Yabe, Yasuteru Sakai, Keietsu Abe, Akira Yokota
Bacteria with an actinomycetes-like morphology have recently been discovered, and the class Ktedonobacteria was created for these bacteria in the phylum Chloroflexi. They may prove to be a valuable resource with the potential to produce unprecedented secondary metabolites. However, our understanding of their diversity, richness, habitat, and ecological significance is very limited. We herein developed a 16S rRNA gene-targeted, Ktedonobacteria-specific primer and analyzed ktedonobacterial amplicons. We investigated abundance, diversity, and community structure in forest and garden soils, sand, bark, geothermal sediment, and compost...
March 17, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28320893/regional-differences-in-nutrient-induced-secretion-of-gut-serotonin
#19
Alyce M Martin, Amanda L Lumsden, Richard L Young, Claire F Jessup, Nick J Spencer, Damien J Keating
Enterochromaffin (EC) cells located in the gastrointestinal (GI) tract provide the vast majority of serotonin (5-HT) in the body and constitute half of all enteroendocrine cells. EC cells respond to an array of stimuli, including various ingested nutrients. Ensuing 5-HT release from these cells plays a diverse role in regulating gut motility as well as other important responses to nutrient ingestion such as glucose absorption and fluid balance. Recent data also highlight the role of peripheral 5-HT in various pathways related to metabolic control...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28320883/the-pseudomonas-aeruginosa-two-component-regulator-algr-directly-activates-rsma-expression-in-a-phosphorylation-independent-manner
#20
Sean D Stacey, Danielle A Williams, Christopher L Pritchett
Pseudomonas aeruginosa is an important pathogen of the immunocompromised, causing both acute and chronic infections. In cystic fibrosis (CF) patients, P. aeruginosa causes chronic disease. The impressive sensory network of P. aeruginosa allows the bacteria to sense and respond to a variety of stimuli found in diverse environments. Transcriptional regulators, including alternative sigma factors and response regulators, integrate signals changing gene expression allowing P. aeruginosa to cause infection. The two-component transcriptional regulator AlgR is important in P...
March 20, 2017: Journal of Bacteriology
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