In order to develop a more efficient method for the cultivation of human epidermal cells suitable for use in the treatment of burns, a culture model using fibronectin coated substrate was established,and the effects of concentration of FN and density of epidermal cells on growth of the cells were evaluated. These results show thatthe cultured model is an effective, and simple method for cultivation of human keratinocytes and it is worthy of clinical trial. The cultured autologous epidermal cell sheets were grafted onto burn wound in 4 burn patients. In two of them the gafts grew into multi-layered keratinocyte epithelium.

Humans ; Indocyanine Green ; Liver Cirrhosis ; Liver Failure

Numerical simulation is one of the most significant methods to predict the temperature distribution in high-intensity focused ultrasound (HIFU) therapy. In this study, the adopted numerical simulation was used based on a transcranial ultrasound therapy model taking a human skull as a reference. The approximation of the Westervelt formula and the Pennes bio-heat conduction equation were applied to the simulation of the transcranial temperature distribution. According to the temperature distribution and the Time Reversal theory, the position of the treatable focal region was corrected and the hot spot existing in the skull was eliminated. Furthermore, the influence of the exposure time, input power and the distance between transducer and skull on the temperature distribution was analyzed. The results showed that the position of the focal region could be corrected and the hot spot was eliminated using the Time Reversal theory without affecting the focus. The focal region above 60 degrees C could be formed at the superficial tis sue located from the skull of 20 mm using the hot spot elimination method and the volume of the focal region increases with the exposure time and the input power in a nonlinear form. When the same volume of the focal region was obtained, the more power was inputted, the less the exposure time was needed. Moreover, the volume of the focal region was influenced by the distance between the transducer and the skull.
Computer Simulation ; High-Intensity Focused Ultrasound Ablation ; Hot Temperature ; Humans ; Neoplasms ; therapy ; Skull

OBJECTIVE: To investigate the effects of Shenshuning Recipe (SSNR) on gene expression of hepatocyte growth factor (HGF) in renal tissues in rats with glomerulosclerosis. METHODS: Glomerulosclerosis was induced in 42 rats by unilateral nephrectomy and intravenous injection of doxorubicin. Then these 42 rats were randomly divided into three groups: untreated group, SSNR-treated group and benazepril-treated group. Another eight rats were included into sham-operation group. The rats in the SSNR-treated group and the benazepril-treated group were fed SSNR or benazepril respectively for 8 weeks. The levels of 24 h urine protein (Upr), serum creatinine (Cr) and blood urea nitrogen (BUN) of rats in each group were examined. The renal morphological changes were observed under microscope, and the diameter of glomerular capillary, mesangial matrix and glomerulosclerosis index were analyzed by image analysis software. Reverse transcription-polymerase chain reaction (RT-PCR) method was used to detect the gene expression of HGF in the renal tissues. RESULTS: The levels of 24 h Upr, serum Cr and BUN in the untreated group were remarkably increased than those in the sham-operation group (P<0.01). The pathological morphological changes in the untreated group showed that the glomerulosclerosis was diffused around the renal tissue and the capillaries were shrunk. The expression level of mesangial matrix was up-regulated and the glomerulosclerosis index was 3.32+/-0.35. The expression level of HGF mRNA in the untreated group was obviously lower than that in the sham-operation group (P<0.05). The levels of 24 h Upr, serum Cr and BUN in the SSNR-treated group and the benazepril-treated group were remarkably decreased as compared with those in the untreated group, while the expression levels of HGF mRNA were both obviously higher than that in the untreated group (P<0.01). The pathological morphological changes in the SSNR-treated group and the benazepril-treated group were both alleviated. There was no significant difference in therapeutic effect between the SSNR-treated group and the benazepril-treated group. CONCLUSION: Shenshuning Recipe can up-regulate the expression of HGF mRNA, decrease the mesangial matrix, and improve the renal function, so that it may retard the development of glomerulosclerosis.

A low calcium medium developed for epidermal keratinocytes were prepared according to the MCDB 153 modified formula and used in human epidermal keratinocyte culture compared with DMEM culture system. The observation by contrast microscopy and electron microscopy showed that in the low calcium medium keratinocytes grew as a monolayer of high proliferation and had many characteristics of basal cells, with a more rounded shape and large intercellular spaces. Increasing the calcium ion concentration in the medium or changing the other culture conditions the cells in these cultures could be induced stratification and terminal differentiation. The results suggest that the growth, proliferation and differentiation of cultured human epidermal keratinocytes can be controlled and regulated someway.

Abstract A rapid gas chromatographic ( GC ) method was established for the determination of short-chain fatty acids ( SCFAs ) in human feces. Feces samples were directly extracted by 1% HCl-75% ethanol solution, and then centrifuged at high speed for GC analysis. The chromatographic separation was performed on a DB-FFAP capillary column ( 30 m í 0 . 25 mm í 0 . 25 μm ) with a temperature program ( initial temperature at 50℃ held for 1 min, ramped to 190℃ at 10℃/min ) . The injection port temperature was 250℃ with split ratio at 50:1 . The carrier gas was high purity nitrogen with a constant linear velocity at 1. 0 mL/min. A flame ionization detector was employed to quantify SCFAs. The proposed method had been certified by systematic method validation, and used to determine feces samples. Subsequently, the health volunteer and colorectal cancer patient groups could be distinguished successfully by multivariate statistical analysis. Compared with health volunteers, the acetic acid and butyric acid of feces from colorectal cancer patients were reduced obviously, indicating that SCFAs particularly butyric acid could be considered as candidate markers for colorectal cancer diagnosis. In summary, this study provides a rapid method for the determination of SCFAs in feces form health volunteers and colorectal cancer patients. The method had a prospect for screening and diagnosing colorectal cancer rapidly.

Objective:To establish a preliminary diagnostic criteria of pathological internet use for field test in China.Methods:Through searching common "pathological internet use" diagnostic criteria or screen criteria in literature,a diagnostic criteria items pool and a preliminary diagnostic criteria of "pathological internet use" were established .According to the diagnostic criteria,each 2 senior professional psychiatrists in turn interviewed 79 patients and their parents,and then made diagnosis respectively. In addiction,44 high school students were each evaluated by one psychiatrist.The definite diagnosis was made when 2 evaluators make the same diagnosis for one patient.Result:In 123 patients,54 were pathological internet use.For diagnosis,the value of kappa for inter-rater reliability was 0.812( P<0.001).In the 12 criteria items,2 for poor inter-rater reliability and 4 for little contribution to diagnosis were eliminated.In the reserved 6 items,if 4 items(or more)were positive,the diagnostic sensitivity was 78.9% and specificity was 95.3%.Functional impairment criteria were made strictly.In the patients who were made the definite diagnosis,90.7% had duration of illness above 3 months,and 77.7% above 6 months.Conclusion:The preliminary diagnostic criteria of pathological internet use after revised includes 6 symptom criteria,3 functional impairment criteria,duration of illness and exclusive criteria.The criteria proposed is with high consistency on evaluations made by psychiatric raters,and with operational convenience.The criteria,after further revised,may fit the clinical application.

Objective To study the expressions of Ki67 and mTOR in Thy-1 nephritis model of rat who were given 1,25-dihydroxyvitamin D3[1,25(OH)2D3] and to explore its mechanism. Methods Healthy male SD rats (n=90) were random?ly divided into three groups: control group, model group, 1,25(OH)2D3 treatment group (n=30 in each group). Model group and 1,25(OH)2D3 treatment group were intravenously injected with anti-Thy1 monoclonal antibody once via tail vein while the control group were administrated with same volume of normal saline through the same route. 1,25(OH)2D3 were adminis?trated at 0.5μg per day intra-gastrically for consecutive 21 days in 1,25(OH)2D3 treatment group while equal volume of pea?nut oil were given in control group and model group. Six rats were randomly selected from each group and sacrificed at the 1st , 3rd , 7th , 14th and 21st after drug intervention. Twenty four hour urine sample were collected in each rat just before it was culled to detect 24-hour urinary protein excretion. Renal tissue samples were harvested and stained with hematoxylin&eo?sin (H&E) and PAS to determine the renal pathological variation and the expressions of mTOR and Ki67 were assessed by immunohistochemistry. Results Urine protein begin to be detected at the first day after model was established, peaked at the 3rd days then started dropping until the 14th day when urine sample turned to normal. Urine protein levels were lower in 1, 25(OH)2D3 treatment group at the 1st,3rd,7th day after model establishment than those in model group(P<0.05). Compared with model group, the pathological damage of renal tissue in 1,25(OH)2D3 treatment group were alleviated at the 3rd and 7th day after model establishment (P < 0.05). Expressions of Ki67 and mTOR in 1, 25(OH)2D3 treatment group were reduced compared with those in model group (P<0.05). Twenty four hour urinary protein and expressions of Ki67 and mTOR as well as renal pathological damage were all positively correlated with each other. Conclusion 1,25(OH)2D3 can inhibit the proliferation of glomerular mesangial cells in Thy-1 nephritis model of rat. And its therapeutic mechanism may be associated with down reg? ulating expressions of Ki67 and mTOR.

Objective To evaluate the safety,feasibility and value of treating familial adenomatous polyposis (FAP) with laparoscopic assisted total colorectal resection.Methods Thirty six patients with familial adenomatous polyposis from June 2009 to May 2014 were reviewed retrospectively.16 FAP patients underwent laparoscopic assisted total colorectal resection and 20 FAP underwent traditional laparotomy.The clinical data,including short term follow up outcomes,safety,and recovery were analyzed retrospectively.Results Laparoscopic assisted total colorectal resection was performed successfully on 16 patients without severe complications.The mean operation time of the laparoscopic group was (178 ± 33) min,the mean operative blood loss (72 ± 30)ml in the laparoseopic group were not significantly different when compared with the mean operation time (159 ± 24) min and the mean operative blood loss (110 ± 50) ml in the conventional group.Incision length (5.6 ± 1.1) cm,the intestinal function recovery time (2.7 ± 0.9) d,hospital stay after surgery (8.1 ± 1.6) d in the laparoseopic group were significantly different when compared with incision length (15.8 ± 1.8) cm,the intestinal recovery time (3.8 ±0.9) d,hospital stay after surgery (9.9 ± 1.6) d in the conventional group (P ＜ 0.05).There was no severe complications in neither group nor local recurrence,distant nletastases or death found during the follow-up of 6-56 months.Conclusions Laparoscopic assisted total colorectal resection for FAP can be performed safely and effectively with the advantages of minimal invasion,quick recovery and good short term effect.

Experience-oriented teaching approach was introduced into the bilingual course of medical imaging in order to improve the teaching effect.This approach was performed through English literature translation activities and scene-teaching.Meanwhile it points out that this approach has particular advantages in stimulating students' interest and initiative in study.