Figure 2 Extracellular DNA accumulates in the matrix of S Typhim

Figure 2 Extracellular DNA accumulates in the matrix of S. Typhimurium JQEZ5 price biofilms. Biofilms of strain 14028 were cultivated in flow chambers at 37°C for 2 days in LB medium and stained for extracellular DNA. Cells in the biofilm were stained with the membrane staining dye FM 4–64 (A). The middle panel depicts the accumulation of extracellular

DNA with TOTO-1 staining (B). The images are merged on the right (C). The large image shows the xy plane and the bottom panel shows the xz plane. The scale bar equals 15 μM. The wild-type 14028 strain carrying the pmrH-gfp construct forms aggregates on the surface of glass (D). The merged image of green fluorescence from pmr expression and red from propidium iodide staining, which stains both dead cells and extracellular DNA (E). DNA-enriched planktonic cultures show increased GDC-0973 cost antibiotic resistance The presence of extracellular selleck compound DNA may lead to

increased S. Typhimurium pmr expression, increased AP resistance and thus help to explain the antibiotic resistance phenotype that is characteristic of biofilms. To determine the influence of DNA on antibiotic resistance, we tested the antibiotic susceptibility of S. Typhimurium 14028 planktonic cultures in the presence and absence of exogenous DNA (pH 7.4). The addition of 0.5% DNA (5 mg/ml) led to a 16-fold increased resistance to polymyxin B and colistin, a 4-fold increased resistance to gentamicin and a >4 fold increase in resistance to ciprofloxacin (Table  1). Both phoPQ and pmrAB mutants did not demonstrate DNA-induced resistance to polymyxin B and colistin. However, both mutants had parental levels of DNA-induced resistance to gentamicin and ciprofloxacin, indicating that resistance to these antibiotics was independent

of the phoPQ and pmrAB systems (Table  1). Extracellular DNA is known to bind to aminoglycosides through electrostatic interactions [25], and it was recently shown that exogenous DNA shields P. aeruginosa from aminoglycoside killing, independent selleck chemicals llc of the pmr resistance mechanism [26]. Table 1 Extracellular DNA induces antibiotic resistance in S. Typhimurium Strain Minimal inhibitory concentration (MIC) Polymyxin B Colistin Gentamicin Ciprofloxacin   – + DNAa – + DNAa – + DNAa – + DNAa 14028 1 16 1 16 0.125 0.5 0.125 >0.5 phoPQ 1 0.5 1 1 0.125 0.25 0.125 >0.5 ΔpmrAB 0.5 0.5 0.5 0.5 0.125 0.5 0.125 >0.5 a The minimal inhibitory concentration (MIC) values were determined in NM2 medium containing 1 mM Mg2+ (pH 7.4) with or without the addition of 0.5% fish sperm DNA-sodium salt (5 mg/ml).

Figure 6 UV–vis spectroscopy of the green multilayer films for di

Figure 6 UV–vis spectroscopy of the green multilayer films for different number of bilayers (10, 20, 30 and 40) and photographs of the coatings. In order Nutlin-3a purchase to understand the incorporation of the multicolorAgNPs inside the LbL assembly, the position of the absorption bands with their corresponding intensities and the aspect in coloration of the final films have been analyzed. However, to create a template of well-defined coloration, the thickness of the resulting films to incorporate the AgNPs plays a key role, which

is perfectly controlled by two factors, the pH value of the polyelectrolyte solutions (PAH and PAA-AgNPs) and the number of bilayers deposited onto glass slides [47, 48]. When the pH of the dipping solutions is 7.5, both PAH and PAA-AgNPs

are adsorbed as fully charged polyelectrolytes and very thin films are obtained. For a total of 40 bilayers, the average thickness is varied from 185 nm (PAH/PAA-AgNPs violet coating), 223 nm (PAH/PAA-AgNPs orange coating) to 293 nm (PAH/PAA-AgNPs green coating). In Figure  7, the evolution of the thickness for different number of bilayers (10, 20, 30 and 40, respectively) with their error bars in this pH regime (7.5) is shown. According to these thickness results, it is possible to appreciate that PAH/PAA-AgNPs with a light orange coloration instead of clearly green coloration is due to the higher incorporation of AgNPs with nanometric spherical size instead of metal clusters selleck compound into the film for a coating of 40 bilayers. Figure 7 Evolution of thickness of the PAH/PAA-AgNPs

multilayer assemblies (violet, green, orange) for different number of bilayers. Obviously, in all the cases of study, the thickness and the resultant color formation depends basically on surface charge of both ionized PAH/PAA polymeric chains, the number of bilayers deposited, the number of the AgNPs incorporated and the distribution of them with a specific shape during the fabrication process. In order to show the aspect of the thin films after LbL fabrication process, AFM click here images of 40 bilayers [PAH/PAA-AgNPs] at pH 7.5 reveal that the morphologies of the thin films were homogeneous, very slight porous surfaces with an average roughness Selleckchem 5FU (rms) of 12.9 nm (violet coloration), 16.7 nm (green coloration) and 18.6 nm (orange coloration). In all the cases, the polymeric chains of the weak polyelectrolytes (PAH and PAA) are predominant in the outer surface and the AgNPs are embedded inside the polymeric films. In order to show the presence of these AgNPs in the LbL assembly, a thermal treatment of the films was necessary with the idea of evaporating the polymeric chains (PAH and PAA, respectively) and so, the contribution of the AgNPs can be appreciated when the fabrication process is performed. In Figure  8, AFM images corresponding to 10, 20, 30 and 40 bilayers of PAH/PAA-AgNPs (violet coloration) after a thermal treatment of 450°C are shown.

These questions include the study of Wolbachia population genetic

These questions include the study of Wolbachia population genetics within infected species [30, 38, 39], and will further extend studies of horizontal transmission between host species for which MLST was originally developed [22]. Highly polymorphic markers will also be useful for experimental evolution of Wolbachia in order to track small genomic changes in short time frames. This

higher resolution comes with the cost though, that markers are not universally applicable to the entire diversity of Wolbachia. (2) The majority of Wolbachia genomes are dotted with many different repeat regions which are highly appropriate to be targeted for the isolation of possible polymorphic markers. Tandem repeat markers such as the ones developed here can be tailored to individual studies. (3) MLVA markers are ideal for rapid Epigenetics Compound Library manufacturer and high-throughput DNA fingerprinting, as no sequencing is required. The markers are ideal to detect multiple infections in single PCR reactions if strains contain alleles with variable amplicon sizes. Our analysis of the evolution of the tandem repeat regions shows that they evolve by gain or loss of repeats. The variability in the number

of ANK repeats, generally constituted by 33 amino acids each, creates size differences that are multiples of 99bp and, like VNTRs consisting of >100bp periods, can be clearly identified following simple PCR screenings without the need of initial sequencing or RFLP analyses as in the case of point mutations. The use of 2-3 highly variable markers per strain can generate Poziotinib molecular weight easily readable fingerprints. Authors’ contribution MR, IIO, WJM and SLO had the initial idea for this manuscript. MR, IIO, WJM and SLO designed the study. MR, IIO and WJM performed laboratory work. MR, IIO, WJM, MW performed data analysis. MR, IIO, WJM, MW and SLO wrote the manuscript. All authors approved the final manuscript.

Acknowledgements We thank Sylvain Charlat, Kostas Bourtzis and the School of Veterinary Science, UQ, for supplying biological material, i.e. H. bolina, C. capitata and D. immitis, respectively. We thank the special edition editor Greg Hurst and two anonymous MLN4924 supplier reviewers for their valuable comments. Fenbendazole The research was supported by grants of the Australian Research Council ARC to MR, IIO, MW and SLO, and from COST Action FA-0701 and the research grant P22634-B17 of the Austrian Science Fund FWF to WJM. This article has been published as part of BMC Microbiology Volume 11 Supplement 1, 2012: Arthropod symbioses: from fundamental studies to pest and disease mangement. The full contents of the supplement are available online at http://​www.​biomedcentral.​com/​1471-2180/​12?​issue=​S1. References 1. Werren JH, Windsor D, Guo LR: Distribution of Wolbachia among neotropical arthropods.

Microbiology 1999, 145:2903–2912 PubMed 22 Rossmann

R, S

Microbiology 1999, 145:2903–2912.PubMed 22. Rossmann

R, Sawers G, Böck A: Mechanism of regulation of the formate-hydrogenlyase pathway by oxygen, nitrate, and pH: definition of the formate regulon. Mol Microbiol 1991, 5:2807–2814.PubMedCrossRef 23. A-1155463 chemical structure Pinske C, Sawers RG: The role of the ferric-uptake regulator Fur and iron homeostasis in controlling levels of the [NiFe]-hydrogenases in Escherichia coli . International Journal of Hydrogen Energy 2010, 35:8938–8944.CrossRef 24. Hantke K: Regulation of ferric iron transport in Escherichia coli K12: isolation of a constitutive mutant. Mol Gen Genet 1981, 182:288–292.PubMedCrossRef 25. Massé E, Vanderpool CK, Gottesman S: Effect of RyhB small RNA on global iron use in Escherichia coli . J Bacteriol 2005, 187:6962–6971.PubMedCrossRef Sepantronium research buy 26. Sambrook J, Russell D: Molecular Cloning: A Laboratory Manual. Third edition. 2001. 27. Hormann K, Andreesen J: Reductive cleavage of sarcosine and betaine by Eubacterium acidaminophilum via enzyme systems different from glycine reductase. Arch Microbiol 1989, 153:50–59.CrossRef 28. Lutz S: Der H 2 -Stoffwechsel

von Escherichia coli : Analyse der Regulation des Formiat-Hydrogen-Lyase-Systems. PhD thesis. Ludwig-Maximilian-Universität München, Faculty of Biology; 1990. 29. Goryshin I, Jendrisak J, Hoffman L, Meis R, Reznikoff W: Insertional transposon mutagenesis by electroporation of released Tn 5 transposition complexes. Nat Biotechnol 2000, 18:97–100.PubMedCrossRef 30. Miller J: Experiments in Molecular Genetics. 1972, 466. 31. Lowry O, Rosebrough N, Farr A, Randall Farnesyltransferase R: Protein measurement with the Tipifarnib Folin phenol reagent. J Biol Chem 1951, 193:265–275.PubMed 32. Griffith KL, Wolf RE: Measuring beta-galactosidase activity in bacteria: cell growth, permeabilization, and enzyme assays in 96-well

arrays. Biochem Biophys Res Commun 2002, 290:397–402.PubMedCrossRef 33. Laemmli U: Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 1970, 227:680–685.PubMedCrossRef 34. Towbin H, Staehelin T, Gordon J: Electrophoretic transfer of proteins from polyacrylamide gels to nitrocellulose sheets: procedure and some applications. Proc Natl Acad Sci USA 1979, 76:4350–4354.PubMedCrossRef 35. Gallagher SR: One-dimensional SDS gel electrophoresis of proteins. Current protocols in protein science/editorial board, John E Coligan [et al] 2001, Chapter 10:Unit 10.1. 36. Abràmoff M, Magalhaes P, Ram S: Image processing with ImageJ. Biophotonics International 2004, 11:36–42. 37. Casadaban MJ: Transposition and fusion of the lac genes to selected promoters in Escherichia coli using bacteriophage lambda and Mu. J Mol Biol 1976, 104:541–555.PubMedCrossRef 38. Pinske C, Bönn M, Krüger S, Lindenstrauß U, Sawers RG: Metabolic deficiences revealed in the biotechnologically important model bacterium Escherichia coli BL21(DE3). PLoS ONE 2011, 6:e22830.PubMedCrossRef 39.

PubMedCrossRef 36 Alverdy JC, Chang EB: The re-emerging role of

PubMedCrossRef 36. Alverdy JC, Chang EB: The re-emerging role of the intestinal microflora in critical illness and inflammation: why the gut hypothesis of sepsis syndrome will not go away. J Leukoc Biol 2008,83(3):461–466.PubMedCrossRef 37. O’Hara AM, Shanahan F: The gut flora as a forgotten organ. EMBO Rep 2006,7(7):688–693.PubMedCrossRef 38. Sekirov I, Finlay BB: The role of the intestinal microbiota in enteric infection. J Physiol 2009,587(Pt 17):4159–4167.PubMedCrossRef find more 39. Lupp C, Robertson ML,

Wickham ME, Sekirov I, Champion OL, Gaynor EC, Finlay BB: Host-mediated inflammation disrupts the intestinal microbiota and promotes the overgrowth of Enterobacteriaceae. Cell Host Microbe 2007,2(2):119–129.PubMedCrossRef 40. Atarashi K, Tanoue T, Shima T, Imaoka A, Kuwahara T, Momose Y, Cheng G, Yamasaki S, Saito T, Ohba Y, et al.: Induction of colonic regulatory T cells by indigenous Clostridium species. Science 331(6015):337–341. Nutlin-3a cost 41. Piagnerelli M, Vincent JL: Role of iron in anaemic critically ill patients: it’s time to investigate! Crit Care 2004,8(5):306–307.PubMedCrossRef 42. Bor-Kucukatay M, Yalcin O, Meiselman HJ, Baskurt OK: Erythropoietin-induced rheological changes of rat erythrocytes. Br J Haematol 2000,110(1):82–88.PubMedCrossRef 43. Casadevall N, Nataf J, Viron B, Kolta A, Kiladjian JJ, Martin-Dupont P, Michaud P, Papo T, Ugo V, Teyssandier I, et al.: Pure red-cell aplasia and antierythropoietin

antibodies in patients treated with recombinant erythropoietin. N Engl J Med 2002,346(7):469–475.PubMedCrossRef 44. Patruta SI, Horl WH: Iron and infection. Kidney Int Suppl 1999, 69:S125–130.PubMedCrossRef 45. Sunder-Plassmann G, Patruta SI, Horl WH: Pathobiology of the role of iron in infection. Am J Kidney Dis 1999,34(4 Suppl 2):S25–29.PubMedCrossRef 46. Alexander J, Limaye AP, Ko CW, Bronner MP, Kowdley KV: Association of hepatic iron overload with invasive fungal infection in liver

transplant recipients. Liver Transpl 2006,12(12):1799–1804.PubMedCrossRef 47. Khan FA, Thiamet G Fisher MA, Khakoo RA: Association of hemochromatosis with infectious diseases: expanding spectrum. Int J Infect Dis 2007,11(6):482–487.PubMedCrossRef Authors’ contributions KR carried out measurements of intestinal mucosal pH, ran mice experiments, and measured iron concentration; AZ carried out C. elegans experiments, RNA isolation and preparation for microarray Crenolanib concentration analysis, and performed pyoverdin assays; HF conceived of the study, measured intestinal mucus pH, and pyoverdin production; VP performed RT-PCR analysis; VV ran mice experiments; SG participated in the reconstruction of the microarray data to reveal main affected subsystems; DL conceived of the study, and participated in its design; OZ conceived of the study, participated in its design and coordination, performed microarray analysis, and wrote the manuscript; JA coordinated the study, participated in the design, and wrote the manuscript.

The processes underlying the loss of motility of the ΔluxS Hp mut

The processes underlying the loss of motility of the ΔluxS Hp mutant were manifested by fewer and shorter flagella that presumably derived from the altered flagella protein production and the modulated

expression of a number of genes linked with flagella assembly and function. Previous studies have shown that mutations of luxS Hp in H. pylori diminished motility on soft agar. The altered motility phenotype was restored completely by genetic complementation with luxS Hp or significantly restored selleck kinase inhibitor by metabolic complementation with wild-type CFS [18–20]. In contrast to our study, in Osaki et al. and Rader et al.’s studies complementation of luxS Hp was performed by placing luxS Hp at a second site in the chromosome rather than at the original locus [19, 20]. Like these previous reports, our study shows that abolished motility of J99 ΔluxS Hp mutation was restored entirely by complementation with the luxS Hp gene and significantly by in vitro synthesised

AI-2. The previous studies, with complete complementation of motility with luxS Hp through insertion at a new chromosomal locus, argue against polar effects of luxS Hp mutagenesis on other genes which influence motility. Our study, with complementation with luxS Hp through creating a revertant results in similar levels of AZD1480 research buy LuxSHp to wild-type and thus better shows that the phenotypes attributed to the mutant were not due Luminespib purchase to secondary mutations elsewhere in the chromosome. Furthermore, having demonstrated that MccAHp and MccBHp function

consecutively to convert the product of LuxSHp (homocysteine) into cysteine as part of the RTSP [15], we reasoned Meloxicam that inactivation of any of these three enzymes would have a similar influence upon cysteine biosynthesis, whilst only the ΔluxS Hp mutant would be devoid of AI-2. Thus, if the reduced motility of the ΔluxS Hp mutant derived from disrupted cysteine biosynthesis, mutants in mccA Hp and mccB Hp would have a similar motility defect. Therefore, we performed an experiment to exclude the possibility that the effect on motility was due to non-specific secondary metabolic effects of LuxSHp. To do this, wild-type, ΔluxS Hp, ΔmccA Hp and ΔmccB Hp strains were inoculated on the same motility plate, allowing the production of AI-2 and the biosynthesis of cysteine to be isolated from each other. As expected, only the ΔluxS Hp mutant was non-motile. This, for the first time, suggests that motility of H. pylori cannot be affected by disrupting the cysteine provision pathway, but can be blocked by the loss of luxS Hp itself. By using a chemically defined medium, we confirmed the provision of cysteine had no effect on motility of H. pylori. Earlier publications have suggested that AI-2 may not act as a signal in some bacteria but instead may simply be a by-product of the important AMC pathway [9].

SVF, stromal-vascular fraction; PP, periprostatic; VIS, visceral

SVF, stromal-vascular fraction; PP, periprostatic; VIS, visceral. Figure 7 Representative example of cell tracking and cancer cell trajectories after stimulation with periprostatic adipose tissue-derived CM. Sequential Geneticin research buy displacements of cells were captured by manual cell tracking and are represented as color lines.

SVF, stromal-vascular fraction. Discussion Prostate cancers frequently have a indolent course even if left without active treatment [18]. However, clinically relevant disease with significant morbidity and mortality also occurs in a significant number of patients [19]. The mechanisms responsible for this aggressive behavior remain elusive, albeit it is well established that the supporting tumor microenvironment has a decisive role in controlling prostate cancer growth, invasion and metastasis [20]. Cancer-implicated mammary and colonic fat pads [11, 21] are physically close to epithelial cells, whereas in prostate there is initially a capsular-like structure separating

the PP fat from tumor cells. Nevertheless, frequently prostate tumors infiltrate the PP fat pad by transposing or infiltrating the physical barriers, resulting in immediate proximity to adipose tissue. Once extension beyond the capsule occurs, the PP adipose tissue-secreted factors, extracellular matrix components or direct cell-cell contact may influence the phenotypic behavior of malignant cells. Recent studies observed that PP adipose tissue thickness was linked to prostate cancer severity [8], while

its secretory profile associated with advanced disease [7]. In the present PDK4 study, we found that https://www.selleckchem.com/products/ag-881.html PP adipose tissue-derived conditioned media may potentiate prostate cancer aggressiveness through modulation of metalloproteinases activity, and by promoting cancer cell proliferation and migration. In tumors, cancer cells are not the only source of MMPs. In our study, MMP9 activity was significantly elevated in the PP adipose tissue of overweight/obese men (BMI ≥ 25 Kg/m2), implying excess body fat and the PP fat depot in the modulation of extra-capsular cancer cells’ microenvironment. Concordantly, other studies found MMP9 to be positively correlated with BMI [22]. Further research is warranted to uncover the effects of MMPs in association with distinct obesity grades. In our sample only two subjects presented BMI > 30 Kg/m2, limitating such approach. Matrix metalloproteinases are proteolytic enzymes that regulate many cell mechanisms with prominence in cancer EPZ015666 manufacturer biology [23]. Their expression in prostate tumors is related with disease progression and metastasis [24], whereas MMP9 was shown to increase growth factors bioavailability and to elicit epithelial-to-mesenchymal transition in tumor cells [25, 26], therefore promoting an aggressive phenotype. A recent report indicated that oesophageal tumors from obese patients express more MMP9 and that co-culture of VIS adipose tissue explants with tumor cells up-regulated MMP2 and MMP9 [27].

The most

The most selleck chemicals llc interesting strain was B. animalis subsp. lactis, which was the least sensitive strain in our study. This pH-resistant strain has a great potential for use in foods as a probiotic supplement since a higher number of bacterial cells would survive the passage. However, to use this strain as probiotic, more studies have to be performed in order to achieve the probiotic status according to the definition of Klaenhammer [3]. In our study, the ingestion of a food matrix was simulated in an initial Vorinostat research buy environment of acidified milk and growth medium. The added simulated gastric solution and oxygen during the stomach

phase increased the stress. During the simulated passage to the small intestine the oxygen was replaced by nitrogen and the medium was neutralized to pH 6.3. The addition of the pancreatic solution and bile salts completed the passage into the small intestine. This in-vitro system did not take into account that in in vivo digestion, enzymes are activated and inactivated and other substances, e.g. bile salts are reabsorbed. Sumeri et al. [9] found a partial solution to bypass this problem. They diluted the content of the reactor with a specially designed dilution medium. Another possibility would be to precipitate

the bile salts at the end of simulation of the small intestine to imitate the enterohepatic circuit. This could be performed with calcium ions [28–30]. Removing the bile salts would better simulate the environment of the Androgen Receptor Antagonist colon and might even allow bifidobacteria to proliferate.

In our study, the remaining bile salts and pancreatic juice in the simulation led to an additional stress on bacteria which probably altered the true characteristics of the strains in vivo. The starting cfu in the simulation varied within one log cfu even though the adjustment of OD650 of the inoculum Buspirone HCl was previously tested with the Bifidobacterium animalis subsp. lactis and Bifidobacterium longum subsp. infantis strains. The bifidobacteria used in this study showed a tendency to form clusters that may result in reduced cfu (visual observations, data not shown). In another study, the formation of clusters could be related to decreasing pH during growth [31]. These clusters are usually counted as one colony on a plate. Figure 6 shows the results of the stomach-intestine passage simulation over 7 h of seven tested Bifidobacterium strains. The concentration of living cells of bifidobacteria decreased immediately after incubation due to the low pH (pH 3.0). However, B. animalis subsp. lactis remained stable. This confirmed the results of previous experiments discussed above (Figure 4). This resistance could be extended to bile salts and pancreatic juice although the cell counts of B. animalis subsp. lactis decreased by about 85% of the initial value (Figure 6). Compared to the other strains used in this study, however, this decrease was almost negligible. All B. longum and B.

According to the vapor–liquid–solid (VLS) growth mechanism [25–27

According to the vapor–liquid–solid (VLS) growth mechanism [25–27], the possible reaction routes can be assumed as follows: (1) (2) (3) (4) (5) (6) Figure 1 Schematics for the selective area growth of ITO nanowire growth. The reaction of the VLS selleck chemicals method is at a high-temperature environment. As the temperature increases to 600°C, the Au drops could be formed, and the low melting point of the source powder (In and Sn) is evaporated to combine with oxygen gas to GSI-IX solubility dmso form metal oxide gases (In2O3, SnO2) through the chemical reactions

of Equations 1 and 2. Subsequently, the metal oxide gases could be reduced by hydrogen to form the metal atoms and then enter to the liquid gold drops to form eutectic alloy through Equations 3 and 4. Furthermore, hydrogen and oxygen could combine to form H2O. Finally, the eutectic alloy drops would be oxidized to form the Sn-doped In2O3 NWs by SN-38 in vivo H2O, namely, Equations 5 and 6. When the temperature increased to 600°C, the oxygen would be introduced into the alumina tube, resulting in the oxidization of In and Sn vapors, with which the growth time would be conducted at 600°C for 3 and 10 h. To decrease the screening effect on the arbitrarily grown ITO NWs, the Sn-doped ITO NWs were alternatively

grown on the Au film with the selective area of patterned 50-μm square with a distance of 10 μm for each square pattern. Figure 2a reveals a SEM image of Sn-doped ITO nanowires after the selective area growth. Clearly, the center of the patterned area shows the arbitrary growth of ITO NWs (Figure 2b), and the inset shows ITO nanowires with catalytic Au nanoparticles, confirming the VLS method of Sn-doped ITO NWs. In addition, the dispersion of ITO nanowire diameter ranges from 40 to approximately 200 nm with an average diameter of 110 nm. Figure 2 SEM images. (a) A SEM image of the selective area growth of ITO nanowires. (b) Enlarged SEM image

taken from the center of the patterned area. The inset shows an ITO nanowire with catalytic gold nanoparticle. To illuminate the detailed structure and components of 3-oxoacyl-(acyl-carrier-protein) reductase the ITO NWs, the as-prepared nanowires were characterized by XRD, TEM, and XPS. Figure 3a shows the X-ray spectra of ITO NWs. All the peaks are indexed being the In2O3 cubic structure, while a small peak shows Au9In4 phase, which comes from the catalytic gold nanoparticles on the top of ITO nanowires. Furthermore, the high-resolution TEM image and the corresponding selected area electron diffraction (SAED) pattern with zone axis of [001] are shown in Figure 3b and the inset, respectively. The symmetric spots in the SAED pattern exhibit a single crystalline phase with the growth direction of [100]. The lattice spacing of 0.506 nm corresponding to (200) plane was indexed, which is consistent with In2O3 cubic phase. The XPS analysis is used to confirm the chemical compositions of ITO NWs. Figure 3c shows the XPS spectra of O 1s, In 3d, and Sn 3d core levels in the ITO NWs.

Int J Syst Bacteriol 1990,40(2):205–208 PubMedCrossRef 67 Stacke

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