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https://www.readbyqxmd.com/read/28812570/independent-evolution-of-shape-and-motility-allows-evolutionary-flexibility-in-firmicutes-bacteria
#1
Fouad El Baidouri, Chris Venditti, Stuart Humphries
Functional morphological adaptation is an implicit assumption across many ecological studies. However, despite a few pioneering attempts to link bacterial form and function, functional morphology is largely unstudied in prokaryotes. One intriguing candidate for analysis is bacterial shape, as multiple lines of theory indicate that cell shape and motility should be strongly correlated. Here we present a large-scale use of modern phylogenetic comparative methods to explore this relationship across 325 species of the phylum Firmicutes...
November 21, 2016: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812152/native-arbuscular-mycorrhizal-symbiosis-alters-foliar-bacterial-community-composition
#2
Anbu Poosakkannu, Riitta Nissinen, Minna-Maarit Kytöviita
The effects of arbuscular mycorrhizal (AM) fungi on plant-associated microbes are poorly known. We tested the hypothesis that colonization by an AM fungus affects microbial species richness and microbial community composition of host plant tissues. We grew the grass, Deschampsia flexuosa in a greenhouse with or without the native AM fungus, Claroideoglomus etunicatum. We divided clonally produced tillers into two parts: one inoculated with AM fungus spores and one without AM fungus inoculation (non-mycorrhizal, NM)...
August 15, 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28808878/role-of-intestinal-microbiome-in-american-ginseng-mediated-colon-cancer-protection-in-high-fat-diet-fed-aom-dss-mice
#3
C-Z Wang, W-H Huang, C-F Zhang, J-Y Wan, Y Wang, C Yu, S Williams, T-C He, W Du, M W Musch, E B Chang, C-S Yuan
OBJECTIVE: Chronic intestinal inflammation is a risk factor for colorectal cancer (CRC) initiation and development. Diets that are rich in Western style fats have been shown to promote CRC. This study was conducted to investigate the role of intestinal microbiome in American ginseng-mediated CRC chemoprevention in a mouse model. The population and diversity of enteric microbiome were evaluated after the ginseng treatment. METHODS: Using an azoxymethane (AOM)/dextran sulfate sodium (DSS)-induced gut inflammation and tumorigenesis mouse model, the effects of oral American ginseng on high fat diet-associated enteric pathology were determined...
August 14, 2017: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/28808547/patterns-of-seasonality-and-group-membership-characterize-the-gut-microbiota-in-a-longitudinal-study-of-wild-verreaux-s-sifakas-propithecus-verreauxi
#4
Andrea Springer, Claudia Fichtel, Gabriel A Al-Ghalith, Flávia Koch, Katherine R Amato, Jonathan B Clayton, Dan Knights, Peter M Kappeler
The intestinal microbiota plays a major role in host development, metabolism, and health. To date, few longitudinal studies have investigated the causes and consequences of microbiota variation in wildlife, although such studies provide a comparative context for interpreting the adaptive significance of findings from studies on humans or captive animals. Here, we investigate the impact of seasonality, diet, group membership, sex, age, and reproductive state on gut microbiota composition in a wild population of group-living, frugi-folivorous primates, Verreaux's sifakas (Propithecus verreauxi)...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28808353/milk-microbiome-and-bacterial-load-following-dry-cow-therapy-without-antibiotics-in-dairy-cows-with-healthy-mammary-gland
#5
Erika C R Bonsaglia, Marilia S Gomes, Igor F Canisso, Ziyao Zhou, Svetlana F Lima, Vera L M Rall, Georgios Oikonomou, Rodrigo C Bicalho, Fabio S Lima
Preventive infusion of antibiotics in the mammary gland of cows consumes 11 tons/year of medically relevant antimicrobials, yet, this practice might not be critical to prevent new infections in the healthy mammary gland of cows. Here, we used next-generation sequencing and quantitative real-time PCR to determine the impact of dry cow therapy without antibiotics on milk microbiome and bacterial load, respectively. Cows diagnosed as negative for mastitis at dry off were randomly allocated to receive antibiotic (intramammary ceftiofur hydrochloride) and teat sealant or just teat sealant...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808126/growth-and-stress-induced-pasta-kinase-phosphorylation-in-enterococcus-faecalis
#6
Benjamin D Labbe, Christopher J Kristich
Transmembrane Ser/Thr kinases containing extracellular PASTA domains are ubiquitous among Actinobacteria and Firmicutes. Such PASTA kinases regulate critical processes including antibiotic resistance, cell division, toxin production, virulence, and are essential for viability in certain organisms. Based on in vitro studies with purified extra- and intracellular fragments of PASTA kinases, a model for signaling has been proposed, in which the extracellular PASTA domains bind as-yet-undefined ligands - typically thought to be peptidoglycan, or fragments thereof - to drive kinase dimerization, which leads to enhanced kinase autophosphorylation and enhanced phosphorylation of substrates...
August 14, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28806408/microbiota-of-little-penguins-and-short-tailed-shearwaters-during-development
#7
Meagan L Dewar, John P Y Arnould, Theo R Allnutt, Tamsyn Crowley, Lutz Krause, John Reynolds, Peter Dann, Stuart C Smith
The establishment and early colonisation of the gastrointestinal (GI) tract has been recognised as a crucial stage in chick development, with pioneering microbial species responsible for influencing the development of the GI tract and influencing host health, fitness and disease status throughout life. Development of the microbiota in long lived seabirds is poorly understood. This study characterised the microbial composition of little penguin and short-tailed shearwater chicks throughout development, using Quantitative Real Time PCR (qPCR) and 16S rRNA sequencing...
2017: PloS One
https://www.readbyqxmd.com/read/28805891/increasing-corn-distillers-solubles-alters-the-liquid-fraction-of-the-ruminal-microbiome
#8
J C McCann, J R Segers, H Derakhshani, T L Felix, E Khafipour, D W Shike
Five ruminally fistulated steers were used in a 5 × 5 Latin square design to determine the effects of increasing dietary fat and sulfur from condensed distiller's solubles (CDS) on the ruminal microbiome. Treatments included a corn-based control (CON) and 4 levels of CDS (0, 10, 19, and 27%) in a coproduct-based (corn gluten feed and soybean hulls) diet. Fat concentrations were 1.79, 4.43, 6.80, and 8.91% for diets containing 0, 10, 19, and 27% CDS, respectively. Steers were fed for ad libitum intake once daily...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28804689/the-role-of-the-skin-and-gut-microbiome-in-psoriatic-disease
#9
Di Yan, Naiem Issa, Ladan Afifi, Caleb Jeon, Hsin Wen Chang, Wilson Liao
PURPOSE: To understand the changes in the microbiome in psoriatic disease, we conducted a systematic review of studies comparing the skin and gut microbiota in psoriatic individuals and healthy controls. FINDINGS: Our review of studies pertaining to the cutaneous microbiome showed a trend towards an increased relative abundance of Streptococcus and a decreased level of Propionibacterium in psoriasis patients compared to controls. In the gut microbiome, the ratio of Firmicutes and Bacteroidetes was perturbed in psoriatic individuals compared to healthy controls...
June 2017: Current Dermatology Reports
https://www.readbyqxmd.com/read/28803405/pcb-dechlorination-hotspots-and-reductive-dehalogenase-genes-in-sediments-from-a-contaminated-wastewater-lagoon
#10
Timothy E Mattes, Jessica M Ewald, Yi Liang, Andres Martinez, Andrew Awad, Patrick Richards, Keri C Hornbuckle, Jerald L Schnoor
Polychlorinated biphenyls (PCBs) are a class of persistent organic pollutants that are distributed worldwide. Although industrial PCB production has stopped, legacy contamination can be traced to several different commercial mixtures (e.g., Aroclors in the USA). Despite their persistence, PCBs are subject to naturally occurring biodegradation processes, although the microbes and enzymes involved are poorly understood. The biodegradation potential of PCB-contaminated sediments in a wastewater lagoon located in Virginia (USA) was studied...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803260/microbial-volatile-compounds-alter-the-soil-microbial-community
#11
Jun Yuan, Mengli Zhao, Rong Li, Qiwei Huang, Waseem Raza, Christopher Rensing, Qirong Shen
Volatile organic compounds (VOCs) from soil bacteria are likely to have an important role in the interactions among soil microorganisms. However, their effects on the soil microbial community have not been extensively studied. In this study, the effect of bacterial VOCs generated by growing Bacillus amyloliquefaciens NJN-6 on modified MS medium on soil microbial community was evaluated. B. amyloliquefaciens NJN-6 was able to produce 48 volatile compounds as determined by solid-phase microextraction-GC/MS. MiSeq sequencing data showed that bacterial VOCs could alter the composition of both soil bacterial and soil fungal communities and could decrease the alpha-diversity of the soil microbial community...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803164/electrochemically-active-microorganisms-from-an-acid-mine-drainage-affected-site-promote-cathode-oxidation-in-microbial-fuel-cells
#12
Claudia Rojas, Ignacio T Vargas, Mary Ann Bruns, John M Regan
The limited database of acidophilic or acidotolerant electrochemically active microorganisms prevents advancements on microbial fuel cells (MFCs) operated under low pH. In this study, three MFCs were used to enrich cathodic biofilms using acid mine drainage (AMD) sediments as inoculum. Linear sweep voltammetry showed cathodic current plateaus of 5.5 (±0.7) mA at about -170mV vs Ag/AgCl and 8.5 (±0.9) mA between -500mV to -450mV vs Ag/AgCl for biofilms developed on small graphite fiber brushes. After gamma irradiation, biocathodes exhibited a decrease in current density approaching that of abiotic controls...
August 3, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28803110/dynamics-of-microbial-activities-and-community-structures-in-activated-sludge-under-aerobic-starvation
#13
Wenlong Liu, Yongzhen Peng, Bin Ma, Linna Ma, Fangxu Jia, Xiyao Li
The knowledge of the effect of aerobic starvation on the functional bacterial activities and community structures is important for the recovery of nutrient removal in activated sludge system. Four aerobic starvation processes (3, 7, 14 and 30days) for nitrifiers and polyphosphate accumulating organisms (PAOs) were studied. The results showed that nitrifiers could utilize the released ammonium for growth during the first 7days of the aerobic starvation, and then gradually decayed. In the recovery period, the slower recovery ability of nitrite-oxidizing bacteria (NOB) than ammonium-oxidizing bacteria (AOB) contributed to the nitrite accumulation...
July 25, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28799297/exploring-the-microbial-diversity-in-jordanian-hot-springs-by-comparative-metagenomic-analysis
#14
Emad I Hussein, Jacob H Jacob, Muhamad Ali K Shakhatreh, Mutaz A Abd Al-Razaq, Abdul-Salam F Juhmani, Christopher T Cornelison
A culture-independent approach was utilized in this study to reveal the microbial diversity in Jordanian hot springs represented by Ma'in and Afra hot springs. Water samples from Ma'in and Afra hot springs were collected in June 2015. The in situ temperature of water samples range was 38-59°C and the pH range was 7.4-8.4. The metagenome was extracted and analyzed using the next generation technology (bTEFAP(®) ). A total of 314,310 sequences were parsed and 288,452 were then clustered. The sequences were predominated by bacteria (>84%) and the relative abundance of archaea in each sample was <1%...
August 10, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28798730/characterization-of-the-culturable-subpopulations-of-lactobacillus-in-the-chicken-intestinal-tract-as-a-resource-for-probiotic-development
#15
Bishnu Adhikari, Young M Kwon
To gain better understanding of the distributions of the culturable Lactobacillus species in the chicken intestinal tract, we collected ceca, and distal ileum from 10 3-weeks-old broiler chickens. Lactobacillus strains from cecal lumen contents (M-CL), and those associated with mucosa of ceca (M-CM) and ileum (M-IM) were recovered on de Man, Rogosa and Sharpe (MRS) agar plates, and used for microbiota analysis. The total cecal content (T-CL) was also used directly for microbiota analysis. We purposefully focused on MRS-recovered populations to gain understanding of the culturable subpopulations of Lactobacillus, since the culturability is an important phenotype in order to exploit the chicken gut microbiota as a resource for development of probiotics...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28797931/changes-in-the-gut-microbial-communities-following-addition-of-walnuts-to-the-diet
#16
Lauri O Byerley, Derrick Samuelson, Eugene Blanchard, Meng Luo, Brittany N Lorenzen, Shelia Banks, Monica A Ponder, David A Welsh, Christopher M Taylor
Walnuts are rich in omega-3 fatty acids, phytochemicals and antioxidants making them unique compared to other foods. Consuming walnuts has been associated with health benefits including a reduced risk of heart disease and cancer. Dysbiosis of the gut microbiome has been linked to several chronic diseases. One potential mechanism by which walnuts may exert their health benefit is through modifying the gut microbiome. This study identified the changes in the gut microbial communities that occur following the inclusion of walnuts in the diet...
July 9, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28796833/bile-microbiota-in-primary-sclerosing-cholangitis-impact-on-disease-progression-and-development-of-biliary-dysplasia
#17
Pedro Pereira, Velma Aho, Johanna Arola, Sonja Boyd, Kalle Jokelainen, Lars Paulin, Petri Auvinen, Martti Färkkilä
OBJECTIVE: The etiopathogenesis and risk for development of biliary neoplasia in primary sclerosing cholangitis (PSC) are largely unknown. Microbes or their metabolites have been suggested to play a role. To explore this potential microbial involvement, we evaluated the differences in biliary microbiota in PSC patients at an early disease stage without previous endoscopic retrograde cholangiography (ERC) examinations, advanced disease stage, and with biliary dysplasia or cholangiocarcinoma...
2017: PloS One
https://www.readbyqxmd.com/read/28794801/gut-dysbiosis-in-mice-genetically-selected-for-low-antibody-production
#18
Ana Carolina da Silva Santos, José Ricardo Jensen, Silvio Luis de Oliveira, Josias Rodrigues
BACKGROUND: Dysbiosis is linked to the cause of several human diseases, many of which having an immunity related component. This work investigated whether mice genetically selected for low or high antibody production display differences in intestinal bacterial communities, and consisted in the comparison of fecal 16SV6-V8 rDNA PCR amplicons resolved by temperature gradient gel electrophoresis (TGGE) of five each of low (LIII) and high (HIII) antibody producing mice. 16SV6 rDNA amplicons of 2 mice from each line were sequenced...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28793309/the-microbiome-in-urogenital-schistosomiasis-and-induced-bladder-pathologies
#19
Adewale S Adebayo, Mangesh Survayanshi, Shrikanth Bhute, Atinuke M Agunloye, Raphael D Isokpehi, Chiaka I Anumudu, Yogesh S Shouche
BACKGROUND: Human schistosomiasis is a highly prevalent neglected tropical disease (NTD) caused by Schistosoma species. Research on the molecular mechanisms influencing the outcomes of bladder infection by Schistosoma haematobium is urgently needed to develop new diagnostics, therapeutics and infection prevention strategies. The objective of the research study was to determine the microbiome features and changes in urine during urogenital schistosomiasis and induced bladder pathologies...
August 9, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28789710/transplanted-human-fecal-microbiota-enhanced-guillain-barr%C3%A3-syndrome-autoantibody-responses-after-campylobacter-jejuni-infection-in-c57bl-6-mice
#20
Phillip T Brooks, Kelsey A Brakel, Julia A Bell, Christopher E Bejcek, Trey Gilpin, Jean M Brudvig, Linda S Mansfield
BACKGROUND: Campylobacter jejuni is the leading antecedent infection to the autoimmune neuropathy Guillain-Barré syndrome (GBS), which is accompanied by an autoimmune anti-ganglioside antibody attack on peripheral nerves. Previously, we showed that contrasting immune responses mediate C. jejuni induced colitis and autoimmunity in interleukin-10 (IL-10)-deficient mice, dependent upon the infecting strain. Strains from colitis patients elicited T helper 1 (TH1)-dependent inflammatory responses while strains from GBS patients elicited TH2-dependent autoantibody production...
August 8, 2017: Microbiome
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