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find Author "龙海燕" 5 results
  • 感染性疾病实验室诊断技术及其研究进展

    目前全球感染性疾病现状严峻,应用于感染性疾病诊断的实验室技术种类繁多,为了解感染性疾病实验室诊断技术及其最新进展,帮助临床工作者早期、快速、准确地诊断感染性疾病,降低感染性疾病暴发的危险性,及时启动感染性疾病的正确治疗等,现从病原学检测、免疫学技术、分子生物学技术、生物传感器、流式细胞术这几个方面对感染性疾病诊断技术进行综述。

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  • The investigation of toxin-producing Clostridium difficile and Candida albicans in the patients with antibiotic-associated diarrhea

    Objective To investigate the infection rates of toxin-producing Clostridium difficile and Candida albicans in patients with antibiotic-associated diarrhea (AAD) in West China Hospital of Sichuan University, analyze their clinical characteristics and make a survey of the therapy. Methods Fecal specimens of AAD patients were collected in West China Hospital of Sichuan University from September 2014 to January 2015. Toxin-producing Clostridium difficile and Candida albicans were identified by polymerase chain reaction and then clinical data of cases was collected and analyzed. Results Twenty-eight patients with Clostridium difficile infection were detected from the 126 AAD patients, 20 patients (15.9%) in whom were infected with toxin-producing Clostridium difficile. Type A+B+, type A-B+, and type A+B- accounted for 35.7% (10/28), 35.7% (10/28) and 28.6% (8/28), respectively. Fifty-four patients (42.9%) with yeast infection were detected. The predominant isolate was Candida albicans, accounting for 20.6% (26/126), and the others were Candida glabrata (n=11), Candida tropical (n=10), Candida parapsilosis (n=3), Saccharomyces cerevisiae (n=2), Pichia pastoris (n=1), and Kodamaea ohmeri (n=1). Toxin-producing Clostridium difficile strains and Candida albicans strains were both isolated from 3 patients (2.4%). The main antibiotics used in AAD ppatients were penicillins, carbapenems, third generation cephalosporins, and fluoroquinolones. AAD patients were all with underlying diseases at different degrees. The main treatments were probiotics and montmorillonite powder. Conclusion The relatively high infection rates and complicated factors of AAD indicate that much more attention needs to be paid to the diagnosis and therapy of AAD by the clinical doctors.

    Release date:2018-05-24 02:12 Export PDF Favorites Scan
  • Clinical Analysis on 121 Cases of Hepatic Hydatidosis

    ObjectiveTo describe the current situation of the prevalence of hepatic hydatidosis, analyze the clinical characteristics and treatment method of the disease, in order to provide scientific basis for personal treatment plans of hepatic hydatidosis. MethodThe clinical data of 121 patients with recurrent hepatic hydatidosis treated between July 2006 and December 2013 were analyzed retrospectively. The general information of hydatid disease of liver, mass of liver, clinical manifestations, laboratory test results, treatment method, effectiveness of the treatment during hospitalization, and follow-up results were collected and analyzed. ResultsMost of the patients were adults from Sichuan and Tibet, and the majority of them had no clear occupation or clear animal contact history and had not taken raw or fresh meat. Lesions in the right lobe occurred in 87 cases, accounting for 71.90%. Abdominal pain and distension were the main clinical manifestations. Twenty-five (20.66%) of these patients were associated with hepatic dysfunction, among whom 23 patients had mild hepatic dysfunction. Alpha-fetoprotein level was increased in one (0.83%) of these cases. A total of 119 of the 121 patients received surgical treatment (98.35%) and all the surgeries were successful. Follow-up results revealed that three of the patients had recurrence. ConclusionsHepatic hydatidosis is an epidemic mainly in the Tibetan district of the West of China. The disease mainly occurs in the right lobe of the liver, which mainly causes mile liver damage. Hepatocellular carcinoma has not been found in these cases. Surgery treatment is the main therapy for liver hydatidosis and may result in good effectiveness.

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  • Effect of different electrical stimulation waves on orientation and alignment of adipose derived mesenchymal stem cells

    ObjectiveTo investigate the effect of different electrical stimulation waves on orientation and alignment of adipose derived mesenchymal stem cells (ADSCs).MethodsADSCs were isolated from 5-week-old Sprague Dawley rats (weight, 100-150 g) and cultivated. The cells at passages 3-5 were inoculated to prepare cell climbing slices, subsequently was exposed to direct-current electrical stimulations (ES) at electric field strengths of 1, 2, 3, 4, 5, and 6 V/cm on a homemade electric field bioreactor (groups A1, A2, A3, A4, A5, and A6); at electric field strength of 6 V/cm, at 50% duty cycle, and at frequency of 1 and 2 Hz (groups B1 and B2) of square wave ES; at electric field strength of 6 V/cm, at pulse width of 2 ms, and at frequency of 1 and 2 Hz (groups C1 and C2) of biphasic pulse wave ES; and no ES was given as a control (group D). The changes of cellular morphology affected by applied ES were evaluated by time-lapse micropho-tography via inverted microscope. The cell alignment was evaluated via average orientation factor (OF). The cytoske-leton of electric field treated ADSCs was characterized by rhodamine-phalloidin staining. The cell survival rates were assessed via cell live/dead staining and intracellular calcium activities were detected by calcium ion fluorescent staining.ResultsThe response of ADSCs to ES was related to the direct-current electric field intensity. The higher the direct-current electric field intensity was, the more cells aligned perpendicular to the direction of electric field. At each time point, there was no obvious cell alignment in groups B1, B2 and C1, C2. The average OF of groups A5 and A6 were significantly higher than that of group D (P<0.05), but no significant difference was found between other groups and group D (P>0.05). The cytoskeleton staining showed that the cells of groups A5 and A6 exhibited a compact fascicular structure of cytoskeleton, and tended to be perpendicular to the direction of the electric field vector. The cellular survival rate of groups A4, A5, and A6 were significantly lower than that of group D (P<0.05), but no significant difference was found between other groups and group D (P>0.05). Calcium fluorescence staining showed that the fluorescence intensity of calcium ions in groups A4, A5, and A6 was slightly higher than that in group D, and no significant difference was found between other groups and group D.ConclusionThe direct-current electric field stimulations with physiological electric field strength (5 V/cm and 6 V/cm) can induce the alignment of ADSCs, but no cell alignment is found under conditions of less than 5 V/cm direct-current electric field, square wave, and biphasic pulse wave stimulation. The cellular viability is negatively correlated with the electric field intensity.

    Release date:2017-07-13 11:11 Export PDF Favorites Scan
  • THREE-DIMENSIONAL CULTURED ADIPOSE-DERIVED STEM CELLS BASED ON MICROBIAL TRANSGLUTAMINASE ENZYME CROSSLINKED GELATIN HYDROGEL

    ObjectiveTo study the growth of adipose-derived stem cells (ADSCs) planted in three-dimensional (3D) materials, a 3D cultured ADSCs system based on microbial transglutaminase (mTG) enzyme crosslinked gelatin hydrogel was constructed. MethodsADSCs were isolated from the subcutaneous adipose tissue of a Sprague Dawley rat by collagenase digestion and centrifugation, and were cultured for passage. The mTG enzyme crosslinked gelatin hydrogel was firstly synthesized by mixing gelatin and mTG, and then the ADSCs were encapsulated in situ (2D environment) and cultured in the 3D materials (3D environment). The morphology and adhesion of cells were observed by inverted phase contrast microscope. In addition, HE staining and Masson staining were carried out to observe the distribution of cells in the material. Living and death situation of ADSCs in the materials was observed by fluorescence microscope and laser scanning confocal microscopy. Scanning electron microscopy was used to observe the adhesion of ADSCs on hydrogel surface. Alamar-Blue method was used to detect the proliferation of ADSCs in the hydrogel. Moreover, the results were compared between the cells cultured in 2D environment and those in 3D environment. ResultsThe result of 2D culture showed that ADSCs grew well on the hydrogel surface with normal functioning and had good adhesion. The results of 3D culture showed that ADSCs grew well in 3D cultured mTG enzyme crosslinked gelatin hydrogel, and presented 3D shape. Cells obviously extended in all directions. The number of apoptotic cells was very small. The cells of 3D culture at each time point was significantly less than that of the conventional culture cells, difference was statistically significant (P < 0.05). But after 8 days culture, the proliferation of the cells cultured in the mTG enzyme crosslinked gelatin hydrogel increased more quickly. ConclusionADSCs can grow well with good adhesion and show high viability in 3D culture system constructed by mTG enzyme crosslinked gelatin hydrogel.

    Release date:2016-12-12 09:20 Export PDF Favorites Scan
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