Search for Articles:
Journal:
Subject:

Search Filter

Years
Between: -
Article Types
Search Results (2768)
Order
page
文章
Kumarss Amini, Taghi Zahraei Salehi*, Gholamreza Nikbakht, Reza Ranjbar, Javid Amini and Shahrnaz Banou Ashrafganjooei
Abstract: It is important to study the genotypic diversity of Salmonella plasmid genes which are responsible for its virulence. In the present study multiplex polymerase chain reaction (multiplex PCR) assay was carried out for detection of Salmonella enteritidis and presence of invA and spv genes. In the first stage of the study, 1001 poultry samples were collected from a slaughterhouse in Kerman province (southern Iran). Biochemical and serological tests were then performed for identification of Salmonella serovars and 6.79% (68/1001) were positive for Salmonella. Multiplex PCR with three set primers was then applied to confirm serovar enteritidis 51.4% (35/68). Simple-PCR was then applied to detect spvA (Salmonella plasmid virulence), and spvB genes. Finally, multiplex PCR assay was carried out to simultaneously detect and identify invA and spvC genes. The presence of spvA, spvB and spvC in S. enteritidis was 88.6% for each gene. In the second stage of the study, thirty-three bovine (n = 13) and human (n = 20) S. enteritidis strains were isolated from the culture collection in the Department of Microbiology, Faculty of Veterinary Medicine, University of Tehran, Iran. The analyses of the samples revealed that spvA, spvB, and spvC genes were present in 90% of S. enteritidis from human sources as compared to 100% in bovine sources. The study represents the first report in Iran about the genotypic diversity of spvA, spvB and spvC genes of S. enteritidis.[...] Read More.
Keywords: Salmonella enteritidis, multiplex PCR, virulence genes.
Full text
Views:731
Download:857
文章
A.  A. Sobowale*, O. A. Odeyingbo, H. O. Egberongbe, R. T. Feyisola, O. A. Ayinde and A. Adesemowo
Abstract: The growth inhibition of Colletotrichum gloeosporioides isolated from cassava was studied in-vitro using Trichoderma longibrachiatum. Both fungi were cultured together on the same Petri plate using three different pairing methods. Inoculation of each fungus on separate Petri plates served as controls. For each pairing method, experiments were conducted in five replicates. Radial growth (cm) of both C. gloeosporioides and T. longibrachiatum in all Petri plates were measured daily for 7 days. In all the three pairing methods, T. longibrachiatum significantly inhibited the growth of C. gloeosporioides (P > 0.0001). Growth inhibition of C. gloeosporioides by T. longibrachiatum was better in ‘inoculating antagonist before pathogen’ than in the other two pairing methods (P = 0.05). C. gloeosporioides had significant addition of radial mycelia only between days 1 and 2, as well as days 2 and 3 after pairing (DAP) before contact was made with T. longibrachiatum. Addition of mycelia mass of C. gloeosporioides slowed down significantly by the day upon contact with T. longibrachiatum (P = 0.05, R2 = 0.86). F value for day after pairing (DAP) was also highly significant (P > 0.0001). T. longibrachiatum could thus be said to possess probable antagonistic tendency against C. gloeosporioides.[...] Read More.
Keywords: Colletotrichum gloeosporioides, Trichoderma longibrachiatum, Manihot esculenta, day after pairing, growth inhibition.
Full text
Views:686
Download:771
文章
P.  Suvarnalatha Devi, M. N. Reddy, M. Nagalakshmi Devamma, P. Jayalakshmi, G. Revathi and G. Narasimha*
Abstract: Alternaria alternata (Fr.) Keissler, the causal agent of Alternariosis of groundnut seeds ( Arachis hypogaea L.) was toxigenic when cultured on various laboratory media. The cell free extract or culture filtrate induced severe chlorosis and necrosis on leaves, inhibition of root and shoot growth of germinating seeds and wilting of seedlings. A phytotoxin was isolated both from cell free extract/culture filtrate and infected tissues, purified and identified as tenuazonic acid, by using thin layer chromatography, ultra violet and infra red spectral analysis. Toxicity was monitored with standard bioassay techniques. The results show patho-physiological significance of tenuazonic acid in disease syndrome.[...] Read More.
Keywords: Alternaria alternata, groundnut, alternariosis, tenuazonic acid.
Full text
Views:888
Download:809
文章
M. D. Makut* and E. M. Godiya
Abstract: An investigation was carried out to determine the species of cellulolytic fungi present in the soil environment of Keffi metropolis. Keffi town is the Headquaters of Keffi Local Government Area of Nasarawa State, Nigeria. Soil samples of 200 g each were collected at random from 10 different locations at dump sites of Keffi town. Malt extract agar and potato dextrose agar were used for the isolation of mesophilic filamentous fungi at incubation temperature of 25°C. All the isolates were again inoculated on chemically defined cellulose agar medium to determine their cellulases producing abilities. The results revealed that the cellulolytic mesophilic fungi were present in the soil environment of Keffi metropolis and they included Aspergillus niger, Aspergillus flavus, Tricoderma viride, Penicillium sp. and Fusarium solani. The fungal isolates could be harnessed as inocula for use in solid waste management involved in the biodegradation of cellulose-containing materials. The results further demonstrate that the isolates could also be harnessed for the industrial production of cellulases.[...] Read More.
Keywords: Cellulases, mesophilic fungi, soil environment, Keffi, Nigeria.
Full text
Views:732
Download:740
文章
Wu Yejin and Wang Yanqun*
Abstract: We have studied the inhibition of polysaccharides of Astragalus membranaceus against liver cancer cell HepG2. The polysaccharides at higher doses (25 mg/ml) have stronger antitumour effects, decreasing more than 40.5% (24 h) and 67.3% (48 h) of liver cancer HepG2 cell viability. A high percentage of apoptotic HepG2 cells was found at 25 mg/ml of A. membranaceus polysaccharides. 23.9 and 38.2% of cells experienced apoptosis when HepG2 cells were treated for 24 and 48 h with 25 mg/ml of A. membranaceus polysaccharides. Consequently, the results of the in vitro assays suggest that the A. membranaceus polysaccharides possesses strong antitumour activities, which is benefical to treatment of liver cancer.[...] Read More.
Keywords: Astragalus membranaceus polysaccharides, Antitumour, HepG2, MTT.
Full text
Views:689
Download:738
文章
Abdulsudi Issa-Zacharia, Yoshinori Kamitani, Happiness Muhimbula and Koichi Iwasaki
Abstract: Antimicrobial effect of slightly acidic electrolyzed water (SAEW: pH 5.6 ± 0.1, 20.5 ± 1.3 mg/L available chlorine concentration; ACC) against indigenous aerobic mesophiles and inoculated Escherichia coli and Salmonella spp. on fresh strawberry was assessed. The antimicrobial effect of SAEW was compared with that of strong acidic electrolyzed water (StAEW) and sodium hypochlorite (NaOCl) solution. SAEW effectively reduced total aerobic mesophilic bacteria from strawberries by 1.68 log10CFU/g and was not significantly different from that of NaOCl solution (p > 0.05). Antimicrobial effect of SAEW against Salmonella spp. and E. coli was indicated by a more than 2 log10CFU/g reduction of their population and the effect was not significantly different from that of NaOCl solution and StAEW at similar treatment conditions (p > 0.05). From these findings, SAEW with a near- neutral pH and low available chlorine concentration exhibits an equivalent bactericidal effectiveness to NaOCl solution and thus SAEW is a potential sanitizer that would be used as an alternative for StAEW and NaOCl solution in the fresh fruit and vegetables industry.[...] Read More.
Keywords: Slightly acidic electrolyzed water, strawberry, total aerobic mesophilic bacteria, Escherichia coli, Salmonella spp
Full text
Views:695
Download:723
文章
Nazila Arbab Soleimani*, Rooha Kasra Kermanshahi, Bagher Yakhchali and Taher Nejad Sattari
Abstract: Staphylococcus aureus is one of the major pathogens which cause Bovine Mastitis (BM). Probiotic lactobacilli have the great potential to produce antimicrobial compounds that inhibit and control pathogenic bacteria. Antagonistic activity of probiotic lactobacilli ( L. acidophilus DSM 20079, L. plantarum ATCC 8014, L. casei ATCC 39392 and L. reuteri ATCC 23272) against S. aureus isolated from bovine mastitis (BM S. aureus) and standard S. aureus ATCC 25923 was the objective of this study. Antagonistic effect of probiotic lactobacilli was investigated by modified double layer method, well diffusion method, co -culturing assay and co-aggregation method. Among four lactobacilli, L. plantarum showed the greatest inhibitory activity. In modified double layer method the zone of inhibition of BM S. aureus and standard S. aureus ATCC 25923 by L. plantarum was 44 and 40 mm, respectively. Cell Free Supernatant (CFS) of probiotic lactobacilli in well diffusion method had inhibitory effect. Inhibition zone of BM S. aureus (13 mm) and standard S. aureus ATCC 25923 (9 mm) by L. plantarum was achieved. Co-culturing of L. plantarum with these two bacteria resulted in 87 and 77% inhibition growth of BM S. aureus and standard S. ureus ATCC 25923, respectively after 12 h. Co-aggregation between L. plantarum with two mentioned S. aureus was obtained 88.4 and 76%, respectively. According to these data, L. plantarum and its antimicrobial compounds can be one of the selective choices to control the BM S. aureus.[...] Read More.
Keywords: Antagonistic effect, probiotic lactobacilli, bovine mastitis, Staphylococcus aureus.
Full text
Views:692
Download:793
文章
Full Length Research Paper
Abstract: Mesenchymal stem cells (MSCs) are undifferentiated multipotent cells which reside in various human tissues and have the potential to differentiate into osteoblasts, chondrocytes, adipocytes, fibroblasts and other tissues of mesenchymal origin. In this study, we investigated the effect of 60Co radiation on the proliferation and differentiation of MSCs. MSCs were treated with increasing radiation doses to assess the effect on MSC. Results showed that 2 Gy of 60Co radiation did not significantly affect MSCs. When compared with the control group and 2Gy of 60Co radiation group, the MSCs viability after 4 Gy of 60Co radiation markedly decreased (p < 0.05). Two weeks of 8 and 12 Gy of 60Co radiation induced all cell death. After the 5-Aza treatment, the expression of myocardial- specific protein, C-TNT and -MHC was not detected in the MSCs which were pretreated by 60Co radiation. In conclusion, middle dose (4 Gy) of irradiation induces MSCs morphological changes, as well as alteration in both proliferation and differentiation potentials of MSCs. 5- Aza treatment did not induce both proliferation and differentiation of MSCs because high dose (8 and 12 Gy) of irradiation killed all cells.[...] Read More.
Keywords: Mesenchymal stem cells, radiation, proliferation, differentiation.
Full text
Views:703
Download:734
文章
Ozer B.*, Kalaci A., Semerci E., Duran N., Davul S. and Yanat A. N.
Abstract: The aim of the study was to investigate the causative pathogens, profile of antimicrobial susceptibility of them and the extent of tissue lesions in diabetic foot infections. This is a prospective study in which infected diabetic foot presenting with Wagner grade 1 to 5 ulcers were investigated. 78 consecutive diabetic patients who were seen in the orthopaedic clinic were cultured during ordinary visits. Bacteriological diagnosis and antimicrobial susceptibility profiles were carried out and analyzed using standard procedures. Diabetic polyneuropathy was found to be a common finding (74.4%). 15 (19.2%) cultures revealed polymicrobial involvement. The most frequent organisms isolated were Enterobacteriaceae (36.5%), Pseudomonas aeruginosa (18.9%), Enterococcus spp. (14.9%), and Staphylococcus aureus (10.8%). While imipenem, meropenem, amikacin, piperacillin/tazobactam were found out to be the most effective agents against Gram -negative organisms, vancomycin, teicoplanin, chloramphenicol were the most effective agents against Gram -positives. The aetiologies of most of the ulcers were neuropathic and 81.6% of them were deep. Our study also revealed that Gram -negative bacteria were the most common pathogens in infected diabetic feet. The diabetic foot ulcer is the most important cause of non-traumatic foot amputations so it is important to know the causative pathogens of these ulcers, profile of antimicrobial susceptibility of them for their treatment.[...] Read More.
Keywords: Diabetes mellitus, foot ulcers, infection, pathogen.
Full text
Views:708
Download:738
文章
Jiansheng Huang, Jinwei Huang*, Fangyou Yu, Xiaoguang Wang and Guoxiong Li
Abstract: AdeABC efflux pump in a total of 50 Acinetobacter baumannii strains were investigated and the role in contributing to hydrolysis carbapenems were further analyzed. All strains were divided into 3 groups according to their susceptibilities to Imipenem, Amikacin, Minocycline and Levofloxacin: Group A (22 imipenem-resistant strains), B (13 isolates which were imipenem-sensitive but resistant to at least one of the other three antibiotics) and C (15 isolates, sensitive to all the antimicrobials). Five gene types were observed according to REP-PCR and 39 isolates were included in the main one. Only one isolate (A2) was positive for efflux pump phenotype. All strains were positive for blaOXA51-like and AdeB gene and negative for blaOXA24, blaOXA58, VIM, IPM, and SIM-1. blaOXA23 were detectable merely in the 22 imipenem-resistant strains. 24 isolates from the same REP type representing for the 3 groups were selected for quantitative analysis of adeB expression. Compared with the mean level of Group B, only A2 expressed apparently higher (2.2 fold). The induction effects of imipenem and meropenem were analyzed as well. Compared with their freely grew isogenic counterparts, up regulated expression was observed only in 2 isolates under the pressure of imipenem and none in all under meropenem. These data indicate that AdeABC efflux pump play a less important role in A. baumannii against carbapenems.[...] Read More.
Keywords: Acinetobacter baumannii, Carbapenem resistance, AdeABC efflux pump, adeB gene.
Full text
Views:724
Download:735
Submit Your Manuscript Now