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文章
Farzad Shahrani, Abbas Doosti,* and Asghar Arshi
Abstract: Feline leukemia virus (FeLV) is a retrovirus that infects cats. This infectious disease is a form of cancer of blood cells called lymphocytes. FeLV occurs in nature not as a single genomic species but as a family of closely related viruses. The aim of present study was to detect FeLV in Iranian domestic cats Reverse transcription polymerase chain reaction (RT-PCR). Fifty six blood samples were tested for FeLV using molecular techniques and out of 56 samples overall frequency of FeLV infection was 2.2%. The results showed that FeLV is a specific infection and the other common feline infectious pathogens and FeLV seem to be endemic in Iranian cats Vaccination and testing programs have proven to be effective in decreasing FeLV infection in Iran and may potentially totally eliminate it at least in other countries.[...] Read More.
Keywords: Feline leukemia virus, PCR, Iranian domestic cats.
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文章
Fariba Heshmati*, Seyeed Amir Yazdanparast , Seyeed Akbar Moosavi , Hussein Dargahi, and Farnaz Tabibzadeh
Abstract: The study of colonization of microbial flora in neonate is very important and finding the causative agent may lead to explore these infections in neonate. In this research the colonization in neonate was measured at the beginning and a few hours after birth. Sampling was performed in operating room, rooming in and nursery section. Some of the neonates deliver by rapture of membrane in normal way and the other deliver by caesarean section. All the samples which are collected were from these sites: 1 Forehead 2) Oral cavity 3) External ear 4) Auxiliary region 5) Umbilical region 6) Perennial region. Also we had some sampling from health care personnel who are worked in operating room or nursery section. At the time of sampling we used sterile gloves, mask and always sterile sets. Sampling was done by use of sterile swabs which were weltering by sterile phosphate buffer or sterile normal saline.Then this sterile swab scrubbed on the special surface of the body of neonate and directly transferred to BA plate, Mac agar plate, EMB agar plate and Sc agar plate and then streaked on these plates. The regions which were sampled ,numbered by 1 to 6 then in other hours once more the sampling were took place from the same site, therefore we began from number 7 to 12 and according to this method for example sampling from neonate A was showed by A1 to A12. The prevalent microorganisms in oral cavity were as follow: 63.5% GPC, 18.5% GPB and 11% GNC. Staphylococcus epidermidis was the major microorganism found in neonate forehead. No bacteria growth was found in 50% of samples through caesarean section. Staphylococcus and Diphtheroied constitute the highest colonization of neonate skin's microorganisms and their growth rates were low at the onset of the birth, but increased after 12 hours. Colonization of gram-negative bacteria in infant hours after birth considered to be an important issue that was studied in this research. Hence hand washing of health-care personnel’s can reduce such bacteria in infant. There was a significant decrease in (GNB) number due to hand washing, hence application of disinfectant solution in hand washing play an important role in controlling microorganisms in care unites.[...] Read More.
Keywords: Colonization, GPC (Gram- positive cocci), GPB (Gram-positive bacilli), GNC (Gram- negative cocci), GNB (Gram- negative bacilli), Microorganism.
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Xiao-pu Yin, Qiu-yan Wang, Shu-juan Zhao, Peng-fei Du, Kai-lin Xie, Lihua Yang, Peng Jin, Jin-hua Liu and Tian Xie*
Abstract: The 2-deoxy-D-ribose-5-phosphate aldolase gene from Thermococcus onnurineus NA1 was sub cloned, over expressed in Escherichia coli and purified to apparent homogeneity. Analysis of the sequence of gene revealed an n of 681 base pairs encoding 227 amino acids predicted to yield a protein having molecular mass 25.3 kDa. The enzyme activity was optimal at 60°C and showed broad temperature adaptability, retaining more than 30% of its maximum activity when assayed at 10 to 75°C. The recombinant protein was heat stable; no activity loss was observed even after incubation at 80°C for 10 min. In addition, the thermophilic enzyme showed a remarkable resistance to acetaldehyde; it retained more than 45% activity after exposure for 20 h to 250 mM acetaldehyde at 25°C.[...] Read More.
Keywords: 2-Deoxy-D-ribose-5-phosphate aldolase, thermostable enzyme, broad temperature adaptability.
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Ong K. S., Chin H. S. and Teo K. C.*
Abstract: Water sample from ex-tin mining lake was collected and cultured on nutrient agar (NA). Morphology characteristics revealed that isolates WL1 and WL4 were Gram-negative cocci and WL3 was Gram-positive cocci. Meanwhile, WL2 and WL5 were Gram-positive bacilli and spore formers. These isolates were screened for their antibiotic sensitivity against 17 types of antibiotics using Kirby-Bauer method. Antibacterial activity against 11 types of indicator bacteria were also tested using agar well diffusion method. The antibiotic susceptibility test demonstrated that all five isolates had high degree of inhibition to five types antibiotics namely amikacin, kanamicin, gentamicin, norfloxacin and tetracycline. Gram-negative cocci WL4 is a multiple resistant isolate that resistant to 10 types of antibiotics. The Gram-positive bacilli WL2 had antibacterial activity against Gram-negative ESCHERICHIA COLI. Enzymatic assay showed that all isolates were proteolytic, lipolytic and phosphatase enzyme producers. Amylolytic activity was absent in all isolates. Protease, leucine arylamidase, alkaline and acid phosphatases, phospholipase esterase and esterase lipase were found in all isolates. The preliminary survey demonstrated that the water environment in the vicinity of Campus Lake is a reservoir of microbial populations. The present work concerns a screening of a few selected isolates with some significance importance in the application of medical and industry fields. In conclusion, the multi resistance isolates were not suitable for industry application due to some facts that it might produce toxic compounds and cause infection. The antimicrobial substance and enzymes produced by the potential isolates could be further screened for clinical application and mass production in industry. However, they must be evaluated for their safety and toxicity to human, animals and the environment.[...] Read More.
Keywords: Nutrient agar (NA), Kirby-Bauer, antibacterial assay, antibiotic susceptibility test, enzymatic assay.
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Han Feng, Qu Wei*, Jiang Huajun, Fu Chongyang, Lu Ming, Zhang Weiguo and Lv Decheng
Abstract: To develop a simple and efficient method for the isolation of highly purified Schwann cells (SCs) from the sciatic nerves of newborn rats, cells were initially cultured in 10% FBS for 6 days, and then cultured in 2% FBS for 6 days. And we used the immunocytochemical characterization, flow cytometry, RT-PCR, to observe the condition of SCs. After the 12-day treatment protocol, we obtained a high yield of SCs with an average purity of 96.9%. Furthermore, the condition of SCs had no change. In our purification protocol, we had shown that our procedures did not alter the cell cycle and neurokines’ secretion. Our simple and efficient method yielded pure and healthy SCs and did not require treatment with anti-mitotic agents or any special equipment.[...] Read More.
Keywords: Schwann cells, cell culture, low fetal bovine serum concentration, tissue engineering, fibroblast.
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文章
Al-Qarawi, A. A., Abd_Allah, E. F.* and Hashem Abeer
Abstract: Investigation has been carried out to evaluate the effect of range plant Ephedra alata as biologically-based strategy inhibit growth characters and aflatoxin production (in vitro and in vivo) of Aspergillus flavus. The aqueous extract of E. alata had significant inhibitory potential against growth as well as aflatoxin production by aflatoxigenic seedborne mold (Aspergillus flavus). Moreover, it has been found that, the addition of 1 and 2% (w/w) of plant powder material of E. alata to corn grains and soybean seeds respectively decreased the aflatoxin contamination and improve their nutritional value (total nitrogen content, fiber content, total lipids content and ash content) under storage conditions. The results observed here suggest employment of E. alata as an alternative non-chemical mean to control aflatoxin contamination of fodder in Saudi Arabia.[...] Read More.
Keywords: Biocontrol, Aflatoxins, Aspergillus flavus, Ephedra alata, nutritional value, Saudi Arabia.
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Adeniran S. Koko, Hans W. Ackermann*, Monisola A. Taiwo and Sunday A. Omilabu
Abstract: Fifteen morphological bacteriophage types were observed in enrichment cultures of sewage, surface water and human feces collected in Lagos, Nigeria. All phages were tailed and belonged to the Myoviridae, Siphoviridae or Podoviridae families. Most phages could be assigned to well-known morphotypes. Ten of them corresponded to phages of enterobacteria or pseudomonads. Four morphotypes (φKZ, T4 and χ, Jersey) prevailed in most samples. Most others occurred in traces only.[...] Read More.
Keywords: Bacteriophages, ecology, identification, morphotypes.
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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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文章
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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