Study subject

Study subject Selleck MCC-950 The subjects of this study included all patients who

were operated for perforated peptic ulcers at Bugando Medical Centre during the period under study. Patients with incomplete data were excluded from the study. Patients treated conservatively and those who failed to consent for HIV infection were also excluded from the study. The details of patients who presented from April 2006 to March 2008 were retrieved retrospectively from patient registers kept in the Medical record departments, the surgical wards, and operating theatre. Patients who presented to the A & E department between April 2008 and March 2011 were prospectively enrolled in the study after signing an informed written consent for the study. A detailed history and thorough physical examination were followed by investigations like full blood count, blood grouping, serum urea, serum creatinine and buy Anlotinib random blood sugar. Patients were also screened for HIV infection using rapid test/ELISA test. A determination of CD 4 count was also performed in all HIV positive patients. Radiological investigations like X-ray abdomen erect and chest X-ray were done in all patients on the suspicion of diagnosis of perforated PUD. Other investigations included hematological profile, serum urea and electrolytes and urinalysis. The diagnosis of perforated

PUD was made from history, plain abdominal and chest radiographs, and confirmed at laparotomy. Patients were put on intra-venous fluids, nasogastric suction, intravenous antibiotics and intravenous

anti-ulcer drugs; adequate hydration was indicated by an hourly urine MLN2238 manufacturer output of 30 ml/hour. After adequate resuscitation, laparotomy was done through midline incision and identified the perforation site. Simple closure of the perforation and reinforcement with pedicled omental patch (Graham’s omentopexy) was done. Thorough peritoneal lavage with 3 to 4 liters of normal saline was followed by placement of intraperitoneal drain. The operations were performed either by a consultant surgeon or a senior resident under the direct supervision Etofibrate of a consultant surgeon. The Boey score [11] as a tool for outcome prediction was calculated based on data recorded at the time of admission to hospital. The Boey risk stratification in perforated peptic ulcer consists of associated medical illness, preoperative shock and long-standing perforation (more than 24 hours). Preoperative shock was defined as a preoperative systolic blood pressure of less than 90 mmHg. All the patients were put on triple regime consisting of Amoxicillin (500 mg TID), Metranidazole(400 mg TID) and Omeprazole (20 mg BID), all given orally for 14 days to eradicate H. Pylori. Patients were followed up on an out patient basis for up to 12 months after surgery.

Plasmids were extracted from overnight samples using QIAprep Spin

Plasmids were extracted from overnight samples using QIAprep Spin Mini Prep kit (Qiagen, Sussex, UK) according to the manufacturer’s instructions and sent for Sanger sequencing (Source BioSciences, Dublin, Ireland). Bioinformatic analysis Following Sanger sequencing, sequence

reads were analysed using the NCBI protein database (BlastX; (http://​blast.​ncbi.​nlm.​nih.​gov/​)). In the event where multiple hits occurred, the BLAST hit which displayed greatest homology is reported. Results and discussion A PCR-based approach highlights the presence of β-lactamase gene homologues in the gut microbiota The results of the β-lactamase-specific PCRs demonstrated the presence and diversity of class 2 β-lactamase genes in the gut microbiota of healthy adults (Table 2[32]). Of the β-lactam primers used, the primers designed find more to amplify bla TEM genes yielded the greatest number of unique sequence hits (42% of selected TOPO sub-clones gave a unique hit). The majority of these AG-881 nmr genes exhibited a high percentage identity with genes from various members of the Proteobacteria including E. coli, Klebsiella, Salmonella, Serratia, Vibrio parahaemolyticus and Escherichia vulneris. The resistance of PRIMA-1MET cell line strains of Salmonella and Serratia to β-lactams via bla TEM genes has been noted [33–35] and such strains have been associated with nosocomial infections [36]. In contrast, there have been relatively

few studies of bla TEM genes in Vibrio parahaemolyticus and Escherichia vulneris[37, 38]. The identification of genes homologous to those from Enterobacteriaceae is not surprising given the prevalence of resistance genes among

members of this family [12]. It was notable that the bla TEM primers also amplified genes that resembled bla TEM genes from some more unusual sources, including two genes from Baf-A1 clinical trial uncultured bacteria and from a Sar 86 cluster (a divergent lineage of γ-Proteobacteria) bacteria. This approach can thus provide an insight into possible novel/unusual sources of resistance genes, including those that culture-based approaches would fail to detect. Such results also highlight that had initial screening for resistant isolates been completed prior to PCR amplification of the resistance genes, such unusual sources of resistance genes may have been overlooked. Additionally, genes encoding ESBLs, including bla TEM-116, bla TEM-195 and bla TEM-96 amongst others, were also identified, with their closest homologues being members of the Proteobacteria (Table 2). Table 2 Homologues of β-lactamase genes detected in the human gut microbiota via PCR techniques Accession # Gene description Closest homologue E value % identity Bla TEM         ADE18890.1 β-lactamase TEM-1 S. enterica subsp. enterica 5e-154 99 AAS46844.1 β-lactamase TEM-1 S. marcescens 2e-156 100 AEN02824.1 β-lactamase TEM-1 K. pneumoniae 3e-111 99 AEN02817.

The AZO films AZO films with overall 1,090 cycles of ZnO plus Al2

The AZO films AZO films with overall 1,090 cycles of ZnO plus Al2O3 layers were alternatively deposited on quartz substrates

at 150°C. The ALD cycles in the ZnO/Al2O3 supercycles are 50/1, 22/1, 20/1, 18/1, 16/1, 14/1, 12/1, and 10/1, where monocycle Al2O3 doping layers were inserted between different cycles of ZnO sublayers. Since the real Smoothened Agonist in vitro Al U0126 solubility dmso concentration matches the ‘rule of mixtures’ formula well at lower Al concentration below 5%, in which the growth rate of the AZO is close to pure ZnO [19]. The Al concentration in the AZO films was calculated using the following formula: (1) where is the percentage of Al2O3 cycles, ρ Al, and ρ Zn are the densities of Al and Zn atoms deposited during each ALD cycle for the pure Al2O3 and ZnO films, respectively. The densities of Al2O3 and ZnO growth by ALD are 2.91 and 5.62 g/cm3[20], So ρ Al and ρ Zn were Selleck Tariquidar calculated to be 5.89 × 10−10 mol/cm2/cycle and 1.27 × 10−9 mol/cm2/cycle, respectively. Figure  3 shows the XRD patterns of the AZO films grown on quartz substrate with different ZnO/Al2O3 cycle ratios that are varied

from 50:1 to 10:1 (corresponding to Al concentration from 0.96% to 4.42%). The diffraction pattern of the pure ZnO film without Al2O3 doping layer is also shown as a reference. The X-ray diffraction pattern from pure ZnO film exhibits multiple crystalline ZnO structure with (100), (002), and (110) peaks [17]. With increasing the Al doping concentration, the (002) and (110) diffraction peaks decrease strongly, thus the AZO films exhibiting (100) dominated the orientation. The intensity of the (100) diffraction peak

reaches a maximum at 2.06% (with the ratio of ZnO/Al2O3 layers is 22/1), and then it decreases at Clostridium perfringens alpha toxin higher Al concentration above 3%. The preferred (100) orientation of the AZO films in our samples is consistent with the results reported by Banerjee et al. [18]. It is worthy to note that the Al2O3 layer by ALD is amorphous at the growth temperature of 150°C, so the decrease of the (100) peak at higher Al concentration can be explained that the amorphous Al2O3 doping layers destroy the crystal quality during the growth of AZO films. Figure  3 also shows that the (100) peak of ZnO shifts to larger diffraction angle with increasing the concentration of Al in AZO films. This can be interpreted as that the increase of the Al concentration will reduce the lattice constant by substitutions of Zn2+ ions (ion radius 0.74 Å) with smaller Al3+ (0.53 Å) ions; therefore, the (100) peak of ZnO shifts to larger diffraction angle in AZO films. Figure 3 XRD patterns of the AZO films with different Al content from 0% to 4.42%. Figure  4 plots the resistivity of AZO films as a function of Al concentration, which was measured by four-point probe technique. As the Al concentration increases from 0% to 2.26%, the resistivity initially decreases from 1.11 × 10−2 to a minimum of 2.38 × 10−3 Ω·cm, and then increases at higher Al doping concentration.

90%~99 70% and the deduced amino acid identities among them were

90%~99.70% and the deduced amino acid identities among them were 92.30%~100.00%, indicating that changes in amino acids were fewer than

those in nucleotides. The vp4s from 10 out of these 14 field strains of EV71 were also sequenced and analyzed with vp4s from other 22 strains of EV71 obtained from GenBank (see Additional file 1). The nucleotide identities in these vp4s were similar to those in vp1s but the deduced amino acid sequences for these vp4s were 98.60%~100.00%. In addition, nucleotide sequence comparisons BTK inhibitor cell line between sequences of EV71 isolated from mild cases and those of EV71 isolated from severe cases in the present study showed that there were no consistent divergences of nucleotides in vp1s or vp4s (data not shown). The vp1s from 14 strains of CA16 isolated from clinical specimens in this study were sequenced and analyzed with vp1s from 14 strains of CA16 obtained from GenBank (see Additional file 1). The nucleotide identities among them were 75.40% ~99.90% while the deduced amino acid identities of them were 91.20%~100.00%. The

nucleotide identities among those CA16 VP4s were 80.20%~100.00% and the deduced amino acids of them were identical (Table 1). Table 1 The nucleotide identities and amino acid identities for the corresponding genes Sequence name Number of strains Nucleotide identity (%) Amino acid identity (%) EV71 vp1s 35 80.90~99.70 click here 92.30~100.00 CA16 vp1s 28 75.40~99.90 91.20~100.00 EV71 vp1s/CA16 vp1s 35/28 62.00~66.80 70.00~72.70 EV71 vp4s 32 79.20~100.00 98.60~100.00 CA16 vp4s 15 80.20~100.00 100.00 EV71 vp4s/CA16 vp4s 32/15 64.30~73.90 78.30~79.70 The nucleotide sequences of vp1s between EV71 and CA16 were also compared using MegAlign of DNAStar. Both vp1 encoding gene from EV71 and CA16 was 891 nucleotides in length and the deduced amino acids of them were 297 in length. The identities of nucleotides for them were 62.50%~66.80% and the deduced amino acid identities for them were 70.00%~72.70%. The comparison between vp4s from EV71 and CA16 using MegAlign of DNAStar showed that the number of nucleotides was 207 in length and the

deduced amino acids of them were 69 in length. The identities of nucleotides among them were 64.30%~73.90% and the identities of the deduced amino acids were 78.30%~79.70% (Table 1). Phylogenetic analysis of complete vp1s and vp4s L-gulonolactone oxidase from EV71 and CA16 Phylogenetic analysis of EV71 was based on the alignment of complete vp1 and vp4 gene sequences from EV71. A total of 36 strains were included in the phylogenetic analysis of the EV71 vp1 genes. Among them, vp1s from 14 EV71 field strains were sequenced in this study, 8 strains available in GenBank were reported in other studies in China, 13 strains obtained from GenBank were used as genotype reference and CA16 strain G-10 was used as an outgroup. Phylogenetic analysis of complete EV71 vp1s showed that these 14 EV71 strains isolated in this study from 2007 to 2009 was closest to C4 sub-genotype (Figure 1A).

Iran J Environ Heal Sci Eng 2005,2(4):251–254 59 Rhoades JD: Sa

Iran J Environ Heal Sci Eng 2005,2(4):251–254. 59. Rhoades JD: Salinity: electrical conductivity and total dissolved solids. In Methods of Soil Analysis. Part 3. Chemical Methods.

Edited by: Sparks DL. screening assay Madison: SSSA; 1996:417–435. 60. Blakemore LC, Searle PL, Daily BK: Methods for chemical analysis of soils. New Zealand Soil Bureau Report IDA. D5C; 1981. 61. Walkley AJ, Black CA: Estimation of soil organic carbon by chromic acid titration method. Soil Sci 1934, 37:29–38.CrossRef 62. Kjeldahl J: A new method for the estimation of nitrogen in organic compounds. Z. Anal Chem 1883, 22:366. 63. Steinbergs A: A method for the determination of total sulphur in soils. Analyst (London) 1955, 80:457–461.CrossRef 64. Anonymous: Guide to the interpretation of analytical data for loam less compost. Ministry of Agriculture, Fisheries and Food, No. 25. ADAS. Mocetinostat mw United Kingdome: Agricultural Development and Advisory Service;

1988. 65. Moral R, Navarro-Pedreno J, Gomez PXD101 manufacturer I, Mataix J: Distribution and accumulation of heavy metals (Cd, Ni and Cr) in tomato plant. Environ Bulletin 1994, 3:395–399. 66. Thompson M, Wood SJ: Atomic absorption methods in applied geochemistry. Atomic Absorption Spectrometry. Edited by: Cantle JE. Amsterdam: Elsevier; 1982:261–284.CrossRef 67. Koplı´k R, Curdova E, Suchanek M: Trace element analysis in CRM of plant origin by inductively coupled plasma mass spectrometry. Fresenius’ J Anal Chem 1998, 300:449–451. 68. Fingerová H, Koplı ´k R: Study of minerals and trace elements. Fresenius J Anal Chem 1993,63(5–6):545–549. 69. Sambrook J, Russell DW: Molecular Cloning. 3rd edition. New York: Cold Spring Harbor Laboratory Press; 2001. 70. DeLong EF: Archaea in coastal marine sediments. Proc Natl Acad Sci 1992, 89:5685–5689.PubMedCrossRef 71. Wilmotte A, van-der Auwera G, de Wachter R: Structure of the 16S ribosomal RNA of the thermophilic cyanobacterium Chlorogloeopsis HTF (‘ Mastigocladus laminosus HTF’) strain PCC7518, and phylogenetic analysis. FEBS Lett 1993,317(1–2):96–100.PubMedCrossRef 72. Altschul SF, Madden TL, Schäffer AA, Zhang J, Zhang Z, Miller W, Lipman DJ: Gapped BLAST and PSI-BLAST: a new generation

of protein database search programs. Nuc Acid Res 1997,25(17):3389–3402.CrossRef 73. Thompson JD, Vildagliptin Gibson TJ, Plewniak F, Jeanmougin F, Higgins DG: The CLUSTAL-X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucl Acid Res 1997,25(24):4876–4882.CrossRef 74. Tamura K, Peterson D, Peterson N, Stecher G, Nei M, Kumar S: MEGA 5: molecular evolutionary genetic analysis using maximum likelihood, evolutionary distance and maximum parsimony methods. Mol Biol Evol 2011. doi:10.1093/molbev.msr121. Competing interests The authors declare that they have no competing interests. Authors’ contributions RCK, PC, LN and SS planned the study. PC performed the experiments. PC and RCK analyzed the results. RCK, PC, LN and SS drafted the manuscript.

This was significant only for the baseline BMD at the hip (p < 0

This was significant only for the baseline BMD at the hip (p < 0.05). In the group of patients with a new non-vertebral fracture, more patients used ART than

in the group without a new non-vertebral fracture (62% versus 24%, p < 0.05). When comparing patients with and without Selleckchem ZVADFMK incident vertebral fractures, there were significantly more patients using corticosteroids (78% versus 54%) in the patients with a new vertebral fracture during follow-up (p < 0.05). Patients with new vertebral fractures had also suffered significantly more non-vertebral buy MCC950 fractures at baseline (p < 0.05), but seemed to have less vertebral fractures at baseline (p = 0.067). There was also a trend for a higher disease activity (mean CRP during follow-up and DAS-28 at baseline) in the patients with a new vertebral fracture compared to patients without a new vertebral fracture (Table 2). Table 2 Demographics and disease variables for patients with and without new vertebral and non-vertebral fractures baseline or follow-up   Vertebral fracture Non-vertebral fracture Yes (18) No (79) p Yes (16) No (86) p Age, years Mean (SD) 61 (6.5) 60 (5.8) 0.49 62 (5.0) 60 (6.1) 0.20 Disease duration, years Mean (SD) 17 (8.7) 17 (10.5)

0.95 18 (8.7) 17 (10.7) 0.70 IgM-RF positive N (%) 9 (50) 24 (30) 0.278 10 (62) 57 (67) 0.77 BMI, kg/m2 Mean (SD) 25.1 (3.8) 25.1 (4.0) 0.96 24.7 (2.9) 25.6 (5.1) S3I-201 mw 0.27 HAQ Mean (SD) 1.56 (0.35) 1.4 (0.72) 0.30 1.4 (0.75) 1.5 (0.68) 0.79 Use of corticosteroids N (%) 14 (78) 43 (54) 0.04 11 (69) 47 (54) 0.30 Use of ART during follow-up N (%) 7 (39) 24 (30) 0.49 10 (62) 21 (24) 0.002 aminophylline BMD spine, g/cm2 at baseline Mean (SD) 0.981 (0.193) 1.159 (0.516) 0.12 0.969 (0.132) 1.151 (0.585) 0.08 BMD hip, g/cm2 at baseline Mean (SD) 0.843 (0.138) 0.840 (0.165) 0.96 0.751 (0.108) 0.858 (0.159) 0.003 DAS-28 at baseline Mean (SD) 5.2 (0.7) 4.7 (1.2) 0.06 4.8 (1.2) 4.8 (1.2) 0.89 Mean ESR, mm/h Mean (SD) 22.3 (13.3) 20.1 (11.5) 0.49 21.7 (13.6) 20.8 (11.6) 0.80

Mean CRP, mg/L Mean (SD) 15.7 (8.0) 11.3 (8.1) 0.07 12.5 (6.4) 12.7 (11.7) 0.82 Vertebral fracture at baseline N (%) 1 (5) 11 (15) 0.067 5 (31) 19 (22) 0.44 Non-vertebral fracture at baseline N (%) 8 (44) 15 (19) 0.02 4 (25) 10 (11) 0.12 Of the patients who were osteopenic at baseline, seven (19%) sustained a new vertebral fracture and six (17%) a new non-vertebral fracture during follow-up. In the group of osteoporosis patients, there were seven (27%) new vertebral and seven (27%) new non-vertebral fractures during follow-up.

The atomic structure of the Ohtake model is shown in Figure 1b F

The atomic structure of the Ohtake model is shown in Figure 1b. Figure 1 Basics of the GaAs(001)-4 × 6 surface. (a) A LEED pattern using an electron energy of 51 eV, (b) atomic structure proposed by Ohtake et al. (adapted from [17]. copyright 2004 American Physical Society), and (c) As 3d and Ga 3d core-level EVP4593 clinical trial photoemission

spectra with various emission angles (θ e). Figure 1c displays the As 3d and Ga 3d core-level spectra of a clean Ga-rich n-GaAs(001)-4 × 6 surface taken in various angles from the normal emission to 60° off-normal emission. The excitation photon energies were set at 85 and 65 eV for As and Ga states, respectively. The estimated escape depth is approximately 0.3 to 0.5 nm. A visual inspection of the As (Ga) 3d photoemission data identifies a feature bulged out at low (high) binding energy, suggesting that the line shape contains components in addition to the main bulk line. In fact, deconvolution of the As 3d core-level spectrum shows four components. Accordingly,

we set up a model PRI-724 concentration function with four spin-orbit pairs as well as a power-law background and a plasmon- or gap-excitation-energy loss tail. The background and loss tail are represented by least squares adjustable parameters that are included in the model function. The background is represented by four parameters: a constant, a slope, and a power-law that is quite successful in representing the degraded electrons from shallower levels. In the energy range of the 3d spectra, the loss tail is almost entirely due to electron-hole pair excitations in the semiconductor. In GaAs, there are none that are smaller than the 1.42-eV bandgap, which implies that almost all of the line structure remains unaffected

by the loss tail. Background subtraction prior to fitting meets with a fundamental objection. It destroys the statistical relationship between the number of counts in the data point and its uncertainty, MycoClean Mycoplasma Removal Kit preventing χ 2 from reaching unity for a perfect fit and interfering with the assessment of the quality of the fit. The fact that the resolved components in the deconvolute exhibit nearly equal widths suggests that the lifetime is the same for all components. The residual differences in width are presumably due mainly to small differences in the phonon or inhomogeneous broadening of bulk and surface components. It is worth noting that a reliable least squares adjustment is readily obtained provided the model function has a multi-parameter global minimum. A multitude of unconstrained width parameters tend to produce local minima defining erroneous, unphysical parameter values. The width parameters were accordingly constrained as needed. The representative fit to the As and Ga 3d states of the clean GaAs(001)-4 × 6 surface are shown in Figure 2.

13 ± 0 06 μM), whereas Cuprizone and BCS had no visible effect

13 ± 0.06 μM), whereas Cuprizone and BCS had no visible effect

on the growth of the parasite, except at the higher concentration of BCS (32 μM) (Figure  4). The IC50 was similar to that of cultures in GFSRPMI (IC50 = 0.10 ± 0.01 μM [7]). Neocuproine selectively chelates reduced copper ions (Cu1+) by bidentate ligation and can Hydroxylase inhibitor diffuse through the cell membrane, while BCS, which chelates Cu1+ and the oxidized copper ion Cu2+, cannot cross the mTOR inhibitor membrane. The cell membrane is permeable to Cuprizone, which chelates Cu2+ [11]. The finding that only Neocuproine inhibited development of the parasite effectively indicates that Cu1+, but not Cu2+, is involved in the mechanisms responsible for the growth arrest of the parasite. Figure 4 Effect Tanespimycin purchase of various copper chelators on growth of asynchronous P. falciparum parasites. Parasites were cultured in

CDRPMI for 95 h in the presence of graded concentrations of the copper chelators Neocuproine, Cuprizone, and BCS; (*) indicates a significant difference versus no BCS. The IC50 of Neocuproine is 0.13 ± 0.06 μM. The effect of Cu1+ on the development of synchronized P. falciparum parasites at the ring stage was tested further by adding graded concentrations of Neocuproine to CDRPMI cultures, followed by culture for 28 h. Neocuproine arrested parasites during the ring–trophozoite–schizont stage progression, in a concentration-dependent manner similar to the results for cultures in GFSRPMI [7]. All stages of the parasite were observed at lower concentrations (0.025, 0.1, and 0.4 μM) at various levels, but only rings were observed at higher concentrations (1.6 μM) (Figure  5). Figure 5 Effect of Neocuproine

on growth of synchronized P. falciparum parasites. Synchronized parasites at the ring stage were cultured in CDRPMI for 28 h in the presence of graded concentrations of Neocuproine. Each developmental stage was counted after Giemsa staining. Levels of parasitemia were 7.60 ± 0.17 (0 μM Neocuproine), 7.44 ± 0.06 (0.025 μM), 7.63 ± 0.08 (0.1 μM), 7.08 ± 0.59 (0.4 μM), and 6.84 ± 0.37 (1.6 μM). The morphology of the rings observed in the presence of higher concentrations of Neocuproine and 3-mercaptopyruvate sulfurtransferase the schizonts in the absence of Neocuproine is shown above graph. To determine the location of the target copper ions that are involved in the growth arrest of the parasite, and of the copper chelators involved in the interaction between the parasite and RBCs, an approach was applied in which PfRBCs and RBCs were treated separately and then mixed, similar to the experiments with TTM. PfRBCs at higher than 5% parasitemia were treated with the copper chelator Neocuproine, for 0.5 h and 2.5 h at room temperature. After washing, PfRBCs and uninfected RBCs were mixed at ratios of more than 1:10, and cultured for 95 h. Growth of P.

Science 2009,324(5931):1190–1192 PubMedCrossRef 5 Turnbaugh PJ,

Science 2009,324(5931):1190–1192.PubMedCrossRef 5. Turnbaugh PJ, Hamady M, Yatsunenko T, Cantarel BL, Duncan A, Ley RE, Sogin ML, Jones WJ, Roe BA,

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Khan et al [27] studied the electrical and optical properties of

[27] studied the electrical and optical properties of a-Se70Te30nanorod thin film. They reported that the absorption mechanism was due to indirect transition. CX-4945 molecular weight The optical band gap was estimated to be 1.18 eV. Khan et al. [28] observed an indirect band gap in the tellurium-rich Ga10Te90-x

Sb x (x = 5, 10, 20, and 30) thin films. The value of band gap decreased with an increase in Sb content. Ilyas et al. [29] also reported an indirect band gap in the tellurium-rich Ga x Te100-x thin films. Abd-Elrahman [30] studied the effect of composition on the optical constants of Se100-x Te x (x = 30, 50, and 70) chalcogenide thin films. They reported that an increase in Se contents (from x = 30 tox = 70) resulted in an increase in indirect gap from 1.33 to 1.85 eV. They also found that the absorption coefficient, refractive index, extinction coefficient, and dispersion buy MM-102 energy of the films were dependent on the film composition. El-Zahed et al. [31] studied the dependence of optical band gap with the composition

of Se(1-x)Te x (x = 0.2, 0.4, 0.5, and 0.8). They found that the optical gap was a function ARS-1620 of composition and the width of optical gap varied from 1.8 to 1.06 eV. The band gap decreased with increasing Te content. Most of the reports presented above predicted indirect band gap and the compositional and photon energy dependence of optical band gap and optical constants in the chalcogenides, whereas in present work, size reduction to the nanoscale level results in a dramatic change in the optical properties. Therefore, it may be concluded that the results presented in this paper show the effect of size on optical properties, i.e., observation of direct band gap and

enhanced value of band gap and optical constants for the a-Se x Te100-x thin films containing aligned nanorods. Figure 5 ( α hν) 2 against photon energy (hν) in a-Se x Te 100- x thin films composed of aligned nanorods. Table 1 Optical parameters ALOX15 of a-Se x Te 100- x thin films at 600 nm Sample E g(eV) α(cm-1) k n ε r ′ ε r ″ Se3Te97 1.66 8.40 × 105 4.01 11.90 125.58 95.53 Se6Te94 1.59 5.16 × 105 2.47 10.69 88.54 108.72 Se9Te91 1.51 10.6 × 105 5.08 9.08 66.31 72.85 Se12Te88 1.45 6.50 × 105 3.11 5.54 20.98 34.40 It is well understood that the optical absorption is dependent on both the short-range order and defect states observed in amorphous systems. We can employ Mott and Davis’s ‘density of state model’ to explain this decrease in optical band gap with the increase in Se concentration. It was suggested by Mott and Davis [32] that the degree of disorder and defects in the amorphous systems are two major factors affecting the width of the localized states near the mobility edges. For the present case of a-Se x Te100-x thin films, it is proposed that the unsaturated bonds together with some saturated bonds are produced during the deposition of atoms in the present as-deposited films [33].