smegmatis glmM gene knockdown strain. PLoS One 2013,8(4):e61589.PubMedCentralPubMedCrossRef 24. Tafelmeyer P, Laurent C, Lenormand P, Rousselle JC, Marsollier
L, Reysset G, Zhang R, Sickmann A, Stinear TP, Namane A, Cole S: Comprehensive proteome analysis of Mycobacterium ulcerans and quantitative comparison of mycolactone biosynthesis. Alvocidib research buy Proteomics 2008,8(15):3124–3138.PubMedCrossRef 25. Blair DE, van Aalten DM: Structures of Bacillus subtilis PdaA, a family 4 carbohydrate esterase, and a complex with N-acetyl-glucosamine. FEBS Lett 2004,570(1–3):13–19.PubMedCrossRef 26. Bui NK, Turk S, Buckenmaier S, Stevenson-Jones F, Zeuch B, Gobec S, Vollmer W: Development of screening assays and discovery of initial inhibitors of pneumococcal peptidoglycan deacetylase PgdA. Biochem Pharmacol 2011,82(1):43–52.PubMedCrossRef 27. Leal AF, de Lima Neto RG, Macedo DP, Beltrao EI, Neves RP: Carbohydrate profiling of fungal cell wall surface glycoconjugates of Trichophyton
tonsurans and other keratinophilic filamentous fungi using lectins. Mycoses 2011,54(6):e789-e794.PubMedCrossRef Idasanutlin 28. Kaoukab-Raji A, Biskri L, Bernardini ML, Allaoui A: Characterization of SfPgdA, a Shigella flexneri peptidoglycan deacetylase required for bacterial persistence within polymorphonuclear neutrophils. Microbes Infect 2012,14(7–8):619–627.PubMedCrossRef 29. Psylinakis E, Boneca IG, Mavromatis K, Deli A, Hayhurst E, Foster SJ, Varum KM,
Bouriotis V: Peptidoglycan N-acetylglucosamine deacetylases from Bacillus cereus, highly conserved proteins in Bacillus anthracis . J Biol Chem 2005,280(35):30856–30863.PubMedCrossRef 30. Milani CJ, Aziz RK, Locke JB, Dahesh S, Nizet V, Buchanan JT: The novel polysaccharide deacetylase homologue Pdi contributes to virulence of the aquatic pathogen Streptococcus iniae . Microbiology 2010,156(Pt 2):543–554.PubMedCentralPubMedCrossRef Competing interests The www.selleckchem.com/products/azd2014.html Authors declare that they have no competing interests. Authors’ contributions SY constructed expression vectors, prepared Rv1096 protein and conducted lysozyme susceptibility assays, deacetylase activity assays, as well as prepared this manuscript. fantofarone FZ purified Rv1096 protein and determined kinetic parameters of PG deacetylase. JK performed bioinformatic analyses of Rv1096 with known PG deacetylases. WZ performed bioinformatic analysis of Rv1096 and the statistical analyses. GD prepared samples for acid-fast staining and SEM. YX participated in designing experiments of the study. YM proposed this project, designed most of experiments and prepared this manuscript. All authors read and approved the final manuscript.”
“Background Acinetobacter baumannii is a non-fermentative Gram-negative bacterium that has emerged as a troublesome opportunistic human pathogen associated with life-threatening infections in the immunocompromised and critically ill [1].
The filtered single cell suspensions were stained with Trypan Blue. The living cells were counted, and primary culture was completed within 2 h, followed by inoculation in simplified serum-free medium (DMEM/F12, containing 2% B27, 20 μg/L EGF and 20 μg/L bFGF), and then culture at 37°C in 5% CO2 saturated humidity incubator. The medium was changed every 3~4 days. The cells were passaged by 1:2 subculture every 7 days and observed under the inverted phase contrast microscope. The cells were passaged three times.
After the cell spheres became regularly shaped, they were dissociated into single cells with 0.25% trypsin + mechanical selleck method, and inoculated into a 96-well plate at 1 living cell/well, with each well added with 100 μL simplified serum-free medium. The wells containing only one cell were labeled under the inverted microscope, and supplemented with 100 μL simplified serum-free medium for further culture.
The formation of single cell colonies was recorded by dynamic observation. The cells were observed under the inverted microscope Quisinostat after culture for about one week, and the proliferated cells were collected and transferred into a culture flask for further culture and proliferation. The purified BTSCs after colony screening were used in the following experiments. (2) Immunofluorescent identification of BTSCs: On the 5th day of passage, BTSs that grew well were re-suspended in culture medium containing a small amount
of serum (DMEM/F12 containing 10%FBS), and dropped onto a poly-L-lysine-coated coverslip. After standing still for about 4 h until the solution adhered to the coverslip, the coverslip was fixed in 4% paraformaldehyde for 30 min, blocked with normal goat serum for 20 min, incubated with rabbit anti-human CD133 antibody overnight at 4°C, and then incubated with Cy3-labeled sheep anti-rabbit IgG at 37°C for 60 min, followed by DAPI counterstaining of the nuclei and A-1155463 order coverslipping with buffered glycerol. Following each step, the coverslip was rinsed with 0.01 mol/L PBS three times, each for 5 minutes. The coverslip was observed after mounting and pictures were taken. (3) Assessment of the effect of ATRA on proliferation of BTSCs: The BTSCs were collected and divided into groups as described below, put into the corresponding Vasopressin Receptor culture medium, disaggregated into single cell suspensions by mechanical dissociation, and inoculated into a 96-well plate at the density of 1000 living cells/well, with 100 Ml in each well. According to the different treatments, the BTSCs were divided into: (1) control group: basic medium (DMEM/F12 with 2% B27) containing the same amount of anhydrous ethanol as in the ATRA group (the final concentration < 0.1%); (2) ATRA group: containing 1 μmol/L ATRA; (3) ATRA/growth factor group: containing 1 μmol/L ATRA, and 20 μg/L EGF and 20 μg/L bFGF; (4) growth factor group: containing 20 μg/L EGF and 20 μg/L bFGF.
The reason for this may be the small number of subjects and, on the other hand, physical performance parameters improved slightly in the PLACEBO group, too. DOMS The DOMS symptoms are particularly associated with the eccentric exercise [16, 17]. In soccer there are a lot of unaccustomed movements (jumps in various situations) and motions (acceleration runs and braking after sprint etc.) and therefore eccentric muscle functions
occur. In the present study the players marked on an average points from 1 to 3 out of 5 showing that they had all consistently some DOMS symptoms. During the last 4th study week the subjects of the HICA group felt milder symptoms compared to the subjects in the PLACEBO check details group. Delayed presentation of the subjective effect could be explained by enzyme inhibition.
We don’t presently know the exact mechanism of action, but it can be speculated that decreased DOMS symptoms could be due to HICA’s direct inhibitory effect on various metalloproteinase enzymes [14]. Training alertness was also increased with concomitant decrease of DOMS symptoms. That effect was significantly noted after the 2nd week in the HICA group and thereafter it seemed to continue up to the last weeks. Mixture of BCAAs has recently shown to decrease symptoms of DOMS but the most effective ratio of the three BCAAs is unclear [43]. In our pilot study with wrestlers [15; unpublished] the findings with HICA suggested that it alone Sapanisertib ic50 is highly effective on DOMS symptoms. According to literature such effect has been described previously with the combination of α-keto isocaproic acid and β-hydroxy-β-methyl butyrate [21]. The mechanism by which HICA alleviates DOMS symptoms is unclear. Future studies are needed to compare the effects of different leucine metabolites, leucine itself and leucine-rich food in humans. Conclusion HICA supplementation of 1.5 g a day leads to small increases in muscle mass during a four week intensive training period in soccer athletes. Acknowledgements The authors thank the subjects participating in this study, Saana Saltevo
who assisted in data acquisition and Mrs Pirjo Luoma for Tacrolimus (FK506) assistance in DXA measurements and analysis. References 1. Hoffer LJ, Taveroff A, Robitaille L, Mamer OA, Reimer ML: Alpha-keto and alpha-hydroxy branched-chain acid interrelationships in normal humans. Journal of Nutrition 1993, 123:1513–1521.PubMed 2. Holecek M: Relation 3Methyladenine between glutamine, branched-chain amino acids, and protein metabolism. Nutrition 2002,18(2):130–133.CrossRefPubMed 3. Yamamoto A: Flavors of sake. II. Separation and identification of a hydroxyl carboxylic acid. Nippon Nogeikagaku Kaishi 1961, 35:619. 4. Van Wyk CJ, Kepner RE, Webb AD: Some volatile components of vitis vinifera variety white riesling. 2. Organic acids extracted from wine. Journal of Food Science 1967,32(6):664–668.CrossRef 5. Begemann WJ, Harkes PD: Enhancing a fresh cheese flavor in foods. U. Lever Brothers Co. U.S; 1974. 6.
Biodivers Conserv. doi:10.1007/s10531-014-0653-2 #Selleckchem ISRIB randurls[1|1|,|CHEM1|]# Ladrón de Guevara M, Lázaro R, Quero JL, Ochoa V, Gozalo B, Berdugo M, Uclés O, Escolar E, Maestre FT (2014) Simulated climate change reduced the capacity of lichen-dominated biocrusts to act as carbon sinks in two semi-arid Mediterranean ecosystems. Biodivers Conserv. doi:10.1007/s10531-014-0681-y Lindo Z, Gonzalez A (2010) The Bryosphere: an integral and influential component of the Earth’s biosphere. Ecosystems 13:612–627CrossRef Liu Y, Li X, Xing Z, Zhao X, Pan Y (2013) Responses of soil microbial
biomass and community composition to biological soil crusts in the revegetated areas of the Tengger Desert. Appl Soil Ecol 65:52–59CrossRef Maestre FT, Bowker MA, Puche MD, Escolar C, Soliveres S, Mouro S, García-Palacios P, Castillo-Monroy AP, Martínez I, Escudero A (2010) Do biotic interactions modulate ecosystem functioning along abiotic stress gradients? Insights from semi-arid plant and biological soil crust communities. Philos Trans R Soc B 365:2057–2070CrossRef Maestre FT, Bowker MA, Cantón Y et al (2011) Ecology and functional
roles of biological soil crusts in semi-arid ecosystems of Spain. J Arid Environ 75:1282–1291CrossRef TPX-0005 mouse Maestre FT, Castillo-Monroy AP, Bowker MA, Ochoa-Hueso R (2012) Species richness effects on ecosystem multifunctionality depend on evenness, composition, and spatial pattern. J Ecol 100:317–330CrossRef Maestre FT, Escolar C, Ladrón de Guevara M et al (2013) Changes in biocrust cover drive carbon cycle responses to climate change in drylands. Glob Change Biol 19:3835–3847CrossRef Mager DM, Thomas AD (2011) Extracellular polysaccharides from cyanobacterial soil crusts: old a review of their role in dryland soil processes. J Arid Environ 75:91–97CrossRef Maier S, Schmidt TSB, Zheng L, Peer T, Wagner V, Grube M (2014) Analyses of dryland biological soil crusts highlight lichens as an
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This overall composition of phyla is comparable to prior 16S rDNA sequencing studies of the human urogenital tract (vaginal microbiota [79] and male urogenital tract [27, 28, 85]). However, we also found sequences from Fibrobacteres, a phylum not previously associated with human microbiota as described by the Human Microbiome Project Selleckchem eFT508 catalog (HMP) [69, 86], the Human
Oral Microbiome Database (HOMD) [70, 87] and in studies on the gastrointestinal tract, vaginal and male urine bacterial flora [27, 28, 79, 88, 89]. Our analysis revealed that the bacterial composition in human female urine specimens is polymicrobial and that there is considerable variation between urine samples
(Figure 2B). Lactobacillus, Prevotella and Gardnerella were the dominant genera (Figure 2A), however, not every urine sample ATM Kinase Inhibitor research buy exhibited 16S rDNA from these genera (Figure 2B), indicating that a single characteristic microbial community for female urine cannot be established. Similar results were also seen in Nelson et al. (2010) [27] and Dong et al. (2011) [28] in their studies on male urine composition. While Lactobacillus and Prevotella were not among the dominant genera in the first study [27], rDNA sequences belonging to these genera Capmatinib concentration were dominant in the latter study [28], as it is in our data. Lactobacillus was, however, considerably more abundant in female than in male urine. The two studies on male urine did not display the genus Gardnerella (typically associated with the female vagina), as a major bacterium, while this genus is one of three dominating genera in our study. In contrast, Sneathia, another vaginal bacterium
– only present at low abundance in female urine, was reported as a dominant genus in male urine. Comparison of V1V2 and V6 primer sets Two different primer sets previously used for investigating human microbial communities [32, 33] covering different parts of the hypervariable regions were used in this study. The V1V2 region is noted for its robustness for taxonomic classification, these while the V6 region is more appropriate for measuring microbial diversity due to high variability [32, 90, 91]. These differences were also reflected in our study where V1V2 uncovered a wider taxonomical range (Figure 2 and Table 2). Both rDNA regions detected approximately the same groups at phylum and order level, however, a larger difference was evident at the genus level. The V1V2 method detected 35 different genera in total, 16 of which were not found in the V6 dataset. The V6 method detected 28 genera in total, where 10 genera were unique to this dataset. Thus, using a combination of these two primer sets clearly maximized the bacterial diversity that could be detected.
Ciprofloxacin treated cells showed no luciferase induction after 60 min and although levels were up to 2-fold higher than in untreated cells after two hours, no click here further increases in expression were detected, even after four hours when the OD started to decrease in response to the ciprofloxacin treatment. Therefore marginal increases
were unlikely to be caused by ciprofloxacin-specific induction of the CWSS as even the lowest inducers, lysostaphin and daptomycin, stimulated 18-fold and 14-fold induction, respectively. Shapes of the induction curves were different for all of the antibiotics tested. Most of the antibiotics triggered immediate induction of the CWSS, with lysostaphin producing the strongest and most rapid response within the first 10 min, followed by flavomycin, bacitracin, daptomycin, vancomycin, teicoplanin and oxacillin. Contrarily, fosfomycin and find more D-cycloserine showed a lag phase of induction for all concentrations of approximately 30 min and 10 min, respectively, before any induction could be detected. Tunicamycin also showed a 10 min lag phase for all concentrations except 5x MIC, for which a slight 3-fold induction could be measured at the 10 min sampling point. Fosfomycin, D-cycloserine and tunicamycin
act on early steps of peptidoglycan synthesis (Figure 1), which could be linked to the lags in CWSS induction. Montelukast Sodium Balibar et al. also detected a lag phase of CWSS induction when S. aureus was treated with the UPP synthesis inhibitor hymeglusin [29].
Concentration-dependence was categorized based on the spread of the induction curves, so that antibiotics with large distances between the curves for different concentrations were scored as being highly PD173074 concentration-dependent; while those in which the majority of curves clustered closely together were scored as having low dependence. The concentration-dependency of induction was also evaluated by determining the ratio of the induction measured at 5x MIC over that at 0.2x MIC (Table 2). Accordingly, fosfomycin, D-cycloserine, oxacillin, tunicamycin, vancomycin, daptomycin and lysostaphin showed relatively high concentration-dependency (ratio >2). Some of these antibiotics such as fosfomycin, oxacillin and daptomycin had quite evenly spread curves that generally increased incrementally as concentrations became higher. Whereas for vancomycin, there was a gap between the supra-MIC curves which both showed relatively high induction, and all of the sub-MIC curves that exhibited very little induction.
Histology After the specified fixation times Bindarit chemical structure (range 1 hr to 5 days), formalin was replaced by 70% ethanol until further processing. Other tissues were immersed in RNAlater (8 hrs) and Boonfix (2, 4, 8 hrs). In addition, also a biopsy fixed in RNAlater or Boonfix was kept in a minus
20°C freezer prior to further processing. After the different fixation procedures and replacement of preservatives by ethanol all tissue samples of one individual animal were simultaneously dehydrated and paraffin embedded. Paraffin blocks were stored at 4°C until use. Routine histology performed on 3 μm sections included HE (all animals save two controls), and the reticulin Volasertib mw staining according to Gordon and Sweet (5 dogs). Primary histological evaluation was based on the 24 hrs formalin fixed wedge
biopsies. Two cases with known hepatic copper storage selleck chemicals were also subjected to routine rhodanine and rubeanic acid stains for copper accumulation. Moreover, two enhancement methods of rubeanic acid staining [18] were performed by 1): washing the slides 5 min. in 10% neutral buffered formalin previous to rubeanic acid staining, or 2): after de-waxing, slides were placed face downwards over a beaker of HCl 37% for 15 min., followed by 15 min. wash in ethanol 90% and routine rubeanic acid staining. The copper scoring system was described previously [21]. Single immunohistochemical staining for K-7, Hepar1, and MRP2 was performed as previously described [13, 14]. References 1. Neff MW, Rine J: A fetching model organism. Cell 2006,124(2):229–231.CrossRefPubMed 2. Lindblad-Toh K, Wade CM, Mikkelsen
TS, Karlsson EK, Jaffe DB, Kamal M, Clamp M, Chang JL, Kulbokas EJ 3rd, Zody MC, et al.: Genome sequence, comparative analysis and haplotype structure of the domestic dog. Nature 2005,438(7069):803–819.CrossRefPubMed 3. Parker HG, Kim LV, Sutter NB, Carlson S, Lorentzen TD, Malek TB, Johnson GS, DeFrance HB, Ostrander EA, Kruglyak L: Genetic structure of the purebred domestic dog. Science 2004,304(5674):1160–1164.CrossRefPubMed 4. Sargan DR, Aguirre-Hernandez J, Galibert F, Ostrander EA: An extended microsatellite set for linkage mapping in the domestic dog. J Hered 2007,98(3):221–231.CrossRefPubMed 5. Wayne RK, CHIR-99021 datasheet Ostrander EA: Lessons from the dog genome. Trends Genet 2007,23(11):557–567.CrossRefPubMed 6. Parker HG, Ostrander EA: Canine genomics and genetics: running with the pack. PLoS Genet 2005, 1:e58.CrossRefPubMed 7. Sutter NB, Ostrander EA: Dog star rising: the canine genetic system. Nat Rev Genet 2004,5(12):900–910.CrossRefPubMed 8. Brinkhof B, Spee B, Rothuizen J, Penning LC: Development and evaluation of canine reference genes for accurate quantification of gene expression. Anal Biochem 2006,356(1):36–43.CrossRefPubMed 9.
This was achieved by incubating the functionalised gold surfaces in a solution of RC-His12-LH1-PufX in 10 mM HEPES pH 7.4, 250 mM KCl, 0.59 mM β-DDM for 15 min and then very gently washing the samples (4 times) in 10 mM HEPES pH 7.4, 250 mM KCl, 0.59 mM β-DDM buffer and storing them in imaging buffer for further use. Different concentration of RC-His12-LH1-PufX was used to
control the surface density of the molecules. A final concentration of 65 nM was used to achieve surface density of 200–300 molecules per μm2 and a final concentration of 800 nM resulted in much denser coverage of the sample #Tideglusib concentration randurls[1|1|,|CHEM1|]# surface used in SMFS experiments. The AFM probes were incubated with a 30 μM solution of cyt c 2-His6 for 15 min and then extensively washed in 10 mM HEPES pH 7.4, 250 mM NaCl, 1 mM LDAO buffer to remove the physisorbed protein. Next, the AFM probes were washed and stored in imaging buffer. In parallel with the AFM probes, gold substrates were functionalised in exactly the same way (at the same time with the AFM probes). This helped us to assess the final surface density of the protein molecules
attached to the AFM probes. We estimated that there are about ABT-263 100–150 molecules attached to the active area on the apex of the AFM probe (defined as the part of the apex of the tip where the attached protein molecules can be brought into contact with the proteins Dolutegravir on the surface). The surface area of that part of the tip is nominally around 22,000 nm2 in this case. AFM measurements All AFM measurements were performed with a Multimode 8 instrument equipped with a NanoScope V (Bruker) controller. NanoScope (v 8.15) software (Bruker) was used for data collection. PeakForce QNM measurements
were performed in imaging buffer (10 mM HEPES pH 7.4, 45 mM KCl) at room temperature using SNL (cantilever C) probes (Bruker). The spring constant for each cantilever was obtained using the built-in cantilever calibration (thermal method) in the NanoScope software; the obtained spring constants for the cantilevers used were in the range 0.121–0.18 N m−1. The Z-modulation amplitude was adjusted to values in the range 20–25 nm to allow enough tip–sample separation in order to fully separate the cyt c 2-His6 from the RC-His12-LH1-PufX molecules on the surface during each ramp cycle. The Z-modulation frequency (repetition rate) was 1 kHz and the contact tip–sample force was kept in the range 100–150 pN. The imaging rate was adjusted in a way that ensured two force–distance curves recorded per image pixel. The pixel size is about 2 nm for the PF-QNM data so given the size of the RC it can be contacted up to 4–6 times by the cyt c 2 molecules as the AFM probe is scanned over the sample (bearing in mind that the ‘binding efficiency’ of the tethered molecules in our experiment is lower compared to free molecules in solution).
References Angermayr SA, Helligwerf KJ, Lindblad P, Teixeira de Mattos MJ (2009) Energy biotechnology with cyanobacteria. Curr Opin Biotechnol 20:1–7CrossRef Benemann J, Oswald WJ (1994) Systems and economic analysis of
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irradiance variations: the construction of a composite and its comparison with models. International Astronomical Union Symposium 185: new eyes to see inside the sun and stars. Kluwer Academic Publishers, Dortrecht, the Netherlands Furbank RT, Hatch MD (1987) Mechanism of C4 photosynthesis. Plant Physiol 85:958–964PubMedCrossRef Leukotriene-A4 hydrolase Goldman JC (1979) Outdoor algal mass cultures II: photosynthetic yield www.selleckchem.com/products/bms-345541.html limitation. Water Res 13:119–136CrossRef Gordon JM, Polle JEW (2007) Ultrahigh productivity from algae. Appl Microbiol Biotechnol 76:969–975PubMedCrossRef Gueymard C (2005) Simple model
of the atmospheric radiative transfer of sunshine (SMARTS), v. 2.9.5 Solar Consulting Services www.nrel.gov/rredc/smarts. Accessed 4 Feb 2011 Kiang NY, Siefert J, Govingee, Blankenship RE (2007) Spectral signatures of photosynthesis I. Review of earth organisms. Astrobiology 7:222–252PubMedCrossRef Marion W, Wilcox S (1994) Solar radiation data manual for flat-plate and concentrating collectors. National Renewable Energy Laboratory (based on the National Solar Radiation Data Base (NSRDB) Version 1.1), Golden, CO National Algal Biofuels Technology Roadmap (2009) U.S. Department of Energy Biomass Program https://e-center.doe.gov/iips/faopor.nsf/UNID/79E3ABCACC9AC14A852575CA00799D99/$file/AlgalBiofuels_Roadmap_7.pdf.
The forward primer Arch21F was shortened to match Volasertib mouse the new annealing temperature of the reverse primer. The cycle profiles had an initial 5 min at 95°C for Taq polymerase activation followed by denaturation at 94°C for 1 min, annealing at 58°C for 30 s and elongation at 72°C for 1 min. The annealing temperature was decreased 1°C every 3 cycles until reaching 55°C where the number of cycles was 30. The reactions were ended with a final elongation step
at 72°C for 7 min. Cloning The PCR-products of nine PCR replicates, generated from two DNA extraction replicates, were pooled and purified using Qiagen MinElute PCR Purification Kit (Qiagen). 8 ng and 15 ng of purified PCR-product were ligated into the plasmid vector pCR 4 TOPO (Invitrogen) in duplicate reactions. One Shot DH5alpha-T1R competent Escherichia coli cells (Invitrogen) were transformed with the vector constructs according to the manufacturer’s instructions in two separate reactions. The transformed cells were plated on LB-agar plates with 50 μg/ml Kanamycin
and incubated at 37°C over night. 95 cloned sequences were amplified directly from transformed single colonies from the two cloning reactions by PCR using the vector specific primers T3 (ATTAACCCTCACTAAAGGGA) and T7 (TAATACGACTCACTATAGGG). The bacterial cells were lysed by five minutes incubation at 94°C followed by PCR-cycles as described above but with a starting annealing temperature of 57°C. Sequencing and sequence analysis Cloned sequences were sequenced from selleckchem both ends using Big Dye Sequencing Kit (Applied Biosystems) and primers T3 and T7 as sequencing primers. Sequence data was generated by capillary gel electrophoresis (3730 DNA analyzer, Applied Biosystems). Raw data sequences were manually inspected using SeqScape (Applied Biosystems). Sequences sequenced from different ends of the PCR-product were aligned using BioEdit (version 5.0.9) [61]. Consensus sequences were generated for 82 clones with overlaps between the 5’ and 3’ end sequences ranging from 80 to 496 bases. The sequences were aligned using the alignment tool of the SILVA rRNA database [26]
and checked for nearly chimeras using the Bellerophon server [62]. The sequences were also aligned with a reference E. Coli sequence, accession number U00096, and checked for chimeras using Mallard [63]. No chimeric sequences were detected with either of the two methods. The similarity between the 16S rRNA gene sequences was determined by generating a similarity matrix using the PKC412 cost DNADIST program in the PHYLIP package [64]. The sequences were then assigned to OTUs based on different similarity thresholds. For Bacteria, 16S rRNA gene sequence similarities of 80%, 90%, 95% and 98.7% approximately represent the division in phylum, family/class, genus and species levels, respectively [23, 24], and we use the same criteria for Archaea.