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文章
Baris Yildiz*, Derya Karakoc, Erhan Hamaloglu, Arif Ozdemir and Ahmet Ozenc
Abstract: Necrotizing fasciitis (NF) is a deadly soft tissue infection characterized by necrosis of subcutaneous tissues. In this study, our aim was to identify variables affecting patient outcome and mortality in necrotizing fasciitis and their temporal changes. We reviewed records of 45 patients treated at our institution between 1979 and 2004. Data about gender, age, etiology, site of involvement, bacteriology, type of surgery, supportive treatment, accompanying diseases, mortality were collected. Factors contributing to mortality were sepsis, renal failure, liver failure, multi organ failure, disseminated intravascular coagulopathy and long term intubation. Mortalities accumulated in first 23 patients. There was not difference in microbiology, demographics, etiology, site of involvement, debridement technics between first patients and recent patients of the institution. Mortality in necrotizing fasciitis is mostly because of sepsis and associated disorders. Adequate control of the microbiological agent and preventing further contamination of the wound is cardinal part of treatment in NF.[...] Read More.
Keywords: Necrotizing fasciitis, bacteriology, mortality, sepsis, Fournier’s gangrene.
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Okhan Kadir AKIN, Muhittin A. SERDAR*, Zeynep CIZMECI and Ozlem GENC
Abstract: The aim of the present study is to assess leukocyte and bacterial counts, and urine strip leukocyte esterase and as well as nitrite results from IQ200 and UriSed full-automatic urine sediment analyzers, with urine culture results. Six hundred urine cultures were performed in accordance with the routine laboratory procedures of the hospital. A growth 10); however, negative likelihood ratios (NLR) were inadequate for both devices and the manual method (NLR >0.3 for all). However, when the utilization of two tests in combination was analyzed, the diagnostic odds ratio was 48 for the IQ200 (95% confidence interval CI, 12.1-190) and 168 for the UriSed (95% CI, 20.6-1369) in cases in which leukocyte, bacteria, and nitrite measurements were high together. The results of the IQ200, UriSed, and urine strip test do not accurately reflect the urine culture results. Nevertheless, it was concluded that negative nitrite and leukocyte results of both automated and manual tests could be utilized in ruling out a urinary tract infection (UTI) diagnosis.[...] Read More.
Keywords: IQ200, UriSed, KOVA® system, full-automatic urine sediment analysis, bacteriologic urine culture, urine microscopy.
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Shaolan Zou*, Minhua Zhang, Jiefang Hong, Yuanyuan Ma and Weina Zhang
Abstract: Four different plasmids were electro transformed into Zymomonas mobilis ZM4 and CP4, two important ethanol-producing strains. The results showed that the best source strain for preparing plasmids was the transformed host strain itself, and Escherichia coli JM110 as the source strain could yield significantly higher transformation efficiencies than Top10. The optimal recovery time of transformed ZM4 or CP4 cells to obtain maximum number of transformants and highest transformation efficiency was 11 h for pZB21-mini, pZB21 and pZA22, but 24 or 20 h for pBBR1MCS-2. The optimal electric field strength for pZB21-mini was 13.25 kV /cm in ZM4 and 14.0 kV /cm in CP4.But for pZA22 and pBBR1MCS-2, it was 11.75 kV /cm in ZM4 and 12.5 kV /cm in CP4; for pZB21, also 12.5 kV /cm in CP4.These plasmids were shown to be more stable in ZM4 than in CP4 by serial transfer to antibiotic-free medium and the 3 plasmids were more stable than pBBR1MCS-2. The results will help to support the genetic and biotechnological research of Z. mobilis by providing information about some of the most important factors that influence the transformation of ZM4 and CP4, and also providing insights into the similarities and differences in their restriction-modification (R-M) systems.[...] Read More.
Keywords: Zymomonas mobilis, plasmids, electroporation, transformation, plasmid stability.
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Adebayo-Tayo B. C., Jonathan S. G.*, Popoola O. O. and Egbomuche R. C.
Abstract: Optimum culture condition for mycelia and exopolysaccharides production (EPS) by Pleurotus ostreatus in submerged liquid culture was investigated. The optimum temperature for mycelia yield and exopolysaccharide production was 25 and 15°C in day 14 with yields of 1.40 g/ml and 2700 mg/l respectively. Optimum pH was found to be 8 with respective yields of 2.5 g/ml and 2665 mg/l in day 12 for mycelia and EPS mannitol (9.75 g/litre) and raffinose stimulated the highest mycelia growth (3.0 g/ml) and EPS production (3000 mg/l) at day 14 respectively. Mycelia yield (2.10 g/ml) and EPS production (2700 mg/l) was optimally supported by urea. Glycine (1.0 g) and leucine (1.0 g) supported optimum production of mycelia yield (2.5 g/ml) and EPS concentration (2925 mg/l) respectively while folic acid and ascorbic acid induced the moderate mycelia yield and EPS concentration respectively. These results have shown that significant improvement in mycelia yield and EPS production by P. ostreatus could be enhanced through submerged cultivation under appropriate optimized conditions.[...] Read More.
Keywords: Culture, Pleurotus ostreatus, mycelia yield, exopolysaccharride-production.
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Xiaozhi Zheng, Ping Ji and Jianqun Hu*
Abstract: Ultrasound-targeted microbubble destruction (UTMD) has been considered as a new approach to the gene therapy of proliferative vitreoretinopathy (PVR), but whether it affect the in vivo PVR model induction remains unknown. In this study, 90 Wistar rats were averagely divided into three groups according to the content of intravitreal injection: normal saline (Group 1), retinal pigmented epithelial -J cells and PRP (Groups 2 and 3). In Group 3, a condition of UTMD was used additionally on days 3 and 7 after injection. On days 14 and 28, the pathological changes of eye grounds were assessed, and the expression levels of transforming growth factor (TGF)- 2 and platelet -derived growth factor (PDGF)-BB were tested. In Group 3, proliferation in the eyes was significantly stronger and faster than that of Group 2 and the ratio of PVR was significantly higher than that of Group 2. The expression levels of TGF- 2 and PDGF-BB were significantly higher in Group 3 than in Group 2. These data suggested that UTMD promotes PVR induced by RPE- J cells and PRP which provide a new method for the development of rat PVR model. This also reminds us that the effects of UTMD should be taken into consideration when using UTMD as an approach to attenuate PVR.[...] Read More.
Keywords: Proliferative vitreoretinopathy, rat model, ultrasound-targeted microbubble destruction, retinal pigmented epithelial -J cells, platelet-rich plasma.
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Lida Lotfollahi,*, Jamileh Nowrouzi, Gholamreza Irajian, Faramarz Masjedian, Bahram Kazemi, Laleh Eslamian, Arash Falahat and Maryam Ramez
Abstract: Listeria monocytogenes is a causative agent of listeriosis. Clinical manifestation of invasive listeriosis is usually sever and include sepsis and meningoencephalitis. Uterian infection in listeriosis depend on gestational age varies from preterm labour, delivery of infected neonate to abortion. The present study investigated the incidence and antibiograms of the organism in clinical samples were collected from women with spontaneous abortions in Iran. Clinical samples were collected from patients with spontaneous abortions hospitalized in Shariati hospital in Tehran during December 2009 and November 2010. Antibiogram was done by disk-agar method. L. monocytogenes was isolated from 9 of 100 samples. Out of 9 isolates of L. monocytogenes 3 (16.66%), 0 (0%), 1 (4%), 3 (12%) and 2 (8%) were isolated from placental tissue, blood, urine, vaginal and rectal swabs respectively. Resistance to Penicillin G had the highest rate. Because of high incidence of L. monocytogenes in this study, in women with history of abortions or bad obstetric history, diagnosis procedures for detection of L. monocytogenes and on time treatment is recommended additionally because of high resistance rate of bacteria to Penicillin G in this study, antibacterial susceptibility before initiation of treatment is recommended.[...] Read More.
Keywords: Listeria monocytogenes, spontaneous abortion, antibiotic resistance.
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Manigeh Mehdinejad*, Azar Dokht Khosravi, Hamideh Yazdizadeh and Porandokht Afshari
Abstract: Bacterial vaginosis is caused by an imbalance of the organisms that naturally exist in the vagina. The importance of bacterial vaginosis with respect to pregnant women’s health is emphasized by the association between bacterial vaginosis and adverse outcome of pregnancy. The aim of present study was to evaluate the direct smear microscopy and culture for determination of bacteria from vaginal discharge of pregnant women. In total, 240 vaginal swabs were collected from 120 pregnant women and were screened for bacterial population. For each patient one swab was used for smear preparation and Gram staining and the second swab was used for cultivation. The prepared Gram-stained smears were observed for various morphotypes. Each morphotype was quantified on a scale from 0 to 4 and weighed to yield a score of 0 to 10, as per Nugent’s system. The bacteria grown in preliminary culture media were identified using standard identification tests. The majority of isolated bacteria in culture were Diphtheroid, Lactobacillus spp., Coagulase-negative Staphylococci and yeast. In Gram-stained smears, 78 (65%) Gram positive rods and 54 (45%) Gram positive cocci were detected. According to Nugent’s criteria, 64 cases (53.33%) were classified as having normal vaginal flora, 45 (37.5%) intermediate flora and 11 cases (9.2%) having bacterial vaginosis. The prevalence of bacterial vaginosis is not very high. However we recommend the regular screening of women with Gram stain method using Nugent’s criteria which is reliable, easy to perform and well suited for the routine clinical laboratory.[...] Read More.
Keywords: Vaginal discharge, bacterial vaginosis, Nugent’s criteria, Gram stain, culture.
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文章
Lawal, A. K.*, Oso B. A., Sanni, A. I. and Akinola, S. O.
Abstract: An investigation was carried out to produce mutant isolates from Bacillus subtilis UG1 and Bacillus licheniformis OG4 isolated from vegetable proteins using a chemical mutagen N-methyl-N-nitrosoguanidine (NTG) at dosage concentration of 250 µg/ml. The mutant isolates obtained from wild strain of B. subtilis UG1 produced mutants (M1 to M9) and was screened for hyper producing effect. Mutant M1UG1 was obtained. The mutant isolates obtained from wild strain B. licheniformis OG4, produced 11 mutants (M1 to M11) and when screened for hyper producing effect mutant M6OG 4, was obtained. Hyper-producing mutant strains M1UG1 and M6OG4 produced L-glutamic acid of 23.0 mg/ml respectively. The quantity produced was higher than the glutamate obtained from Corynebacterium glutamicum ATCC 13032 (14 mg/ml). The developed mutant strain was better adapted to a shift in temperature range of 55 to 60°C, pH 9.0 and biotin concentration of 10 µg/ml. As part of the programme to increase glutamate yields and to use materials of agro-industrial wastes, the developed mutants M1UG1 and M 6OG4 were found to utilize the tested agro-industrial wastes maximally for growth and glutamic acid production.[...] Read More.
Keywords: L-glutamic acid, agro-industrial wastes, mutants, N-methyl-N-nitrosoguanidine (NTG), fermented vegetable proteins.
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文章
Khandaghi Jalil*, Razavilar Vadood and Barzegari Abolfazl
Abstract: Although more than 100 serotypes of shigatoxigenic Escherichia coli (STEC) have been implicated in cases of human diseases, E. coli O157 is the most common serogroup connected with sporadic cases and large outbreaks of diseases in many countries. Rapid and sensitive identification of this dangerous pathogen is important for patient management and for prompt epidemiological investigations. PCR has become a very rapid and reliable tool for the molecular diagnosis of E. coli O157. PCR assays are usually aimed at detecting the shiga toxins, the intimin protein and enterohaemolysin. In the present study, a mPCR-based protocol is described as that which uses one primer set to detect the gene responsible for the production of the O- antigen synthesis (rfb O157) and four primer set to detect the major virulence factor genes including the Shigatoxin type 1 and 2 ( stx1 and stx2), intimin (eaeA) and enterohemolysin (EHEC hlyA) directly from 190 samples of animal faeces at the time of slaughter after overnight incubation of stool specimens in BPW. In this research, we use one primer set for detection of the gene responsible for the production of the O- antigen synthesis (rfb O157) and four primer set for detection of the Shigatoxin type 1 and 2 (stx1 and stx2), intimin (eaeA ) and enterohemolysin (EHEC hlyA) producing genes directly from 190 samples of animal faeces at the time of slaughter after overnight incubation of stool specimens in BPW. This study has established the presence of rather high prevalence of E. coli O157-positive animals at abattoirs (These consisted of 4.2% of cattle and 2.1% of sheep), providing an increased risk of transmission of E. coli O157 to the food chain and contamination of human.[...] Read More.
Keywords: Shigatoxigenic Escherichia coli (STEC), E. coli O157, shiga toxins, intimin, enterohaemolysin, mPCR.
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Sayed W. F.*, Salem W. M. and Ali M. S.
Abstract: Aqueous neem (Azadiracta indica) leaf extract was tested for its effect on Casuarina equisetifolia seed germination capacity, growth of Frankia and on some dominant rhizosphere microorganisms under casuarinas grown in soil contaminated with sewage water. Analysis was carried out to determine the main micro- and macroelement content of different extract amounts. The addition of extract amount between 10- 20 µl per 10 ml medium (1 - 2 µl ml-1) selectively stimulated Frankia growth and inhibited other non- beneficial bacteria and fungi in the rhizosphere such as Bacillus subtilis, Drechslera sp and Curvularia lunata. Slight increase was observed in Casuarina seed germination capacity with 1- 2 µ ml-1 of the extract, but with no significant differences, indicating at least no negative effect of the extract on seed germination. According to the results and as the roots and leaves of both Casuarina and neem release their active components in soil, and according to previous recommendations, we suggest a significant synergistic effect between Casuarina, rhizosphere microorganisms and neem trees for the benefits of Casuarina nodulation, growth performance and nitrogen fixation.[...] Read More.
Keywords: Neem, Casuarina, aqueous extract, Frankia, rhizospheric microorganisms.
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