Objective To evaluate the mutagenicity of hydrolysate of Meretrix meretrix Linnaeus soft tissue, so as to provide experimental basis for its exploitation.Methods Three mutagenicity tests were used to evaluate the mutagenic effects, including Ames test, CHL chromosome aberration assay and bone marrow micronucleus assay in mice.Results In Ames test, the revertant colonies numbers in each group were twice less than the numbers of spontaneous revertant colo-nies, five bacterial strains showed negative results with or without S9 activation, and the result of Ames test was negative. The CHL chromosome aberration assay and bone marrow micronucleus assay showed that the chromosome aberration rate and micronucleus rate of each dose group showed no significant difference compared with the negative control group, respec-tively ( P>0.05) .Conclusions Under this condition, the results show that all of the Ames test, chromosome aberration assay and bone marrow micronucleus assay are negative, and no mutagenicity is observed in the hydrolysate of Meretrix mer-etrix Linnaeus soft tissue.

AIM: To investigate the biocolonization of poly 2-hydroxyethy methacrylate (PHEMA) sponge with cornea tissue and evaluate the therapeutic effects of modified porous poly 2-hydroxyethy methacrylate-Polymethyl met-hacrylate (PHEMA-PMMA) Keratoprostheses (KPro) on rabbit and monkey corneas. METHODS:The KPro were made using two-stage polymerization combined with mechanical cutting. The experiment was divided into two groups. In the control group, ten normal rabbit eyes received lamellar implanta-tion of PHEMA sponges. The sponges were obtained 2 weeks, 1,2,3 and 4 months after operation. The cell proliferation and neovascularization inside the sponges were observed using light and transmission electron microscopy (TEM) and immunohistochemistry. In the experimental group, the porous PHEMA-PMMA KPros were inserted into the lamellar pockets of eight rabbit corneas and two monkey corneas (stage I operation). The healing process was investigated by slit-lamp microscopy. The anterior lamellar cornea tissues were removed 3 months after surgery, exposing the under-neath transparent core (stage II operation). The operated eyes were then followed up for 3-6 months.light microscope, fibroblasts started to grow into the cornea 2 weeks after operation; lots of cells, accompanied with new blood vessels, invaded into the cornea 2-3 months after surgery. Invading cells of sponge, as well as keratocytes, were positive for vimentin. Under the electron microscope, the invading cells looked healthy and were surrounded by extracellular matrix and collagen. In 8 rabbit eyes which received KPro implantation, anterior lamellar cornea melting happened in two eyes after the stage II operation. The remaining 6 corneas retained their central cores during observation after the stage II operation.Two monkey operated eyes were found no complication thoughout the whole follow-up.cornea. The modified PHEMA-PMMA KPros have obtained a relatively stable results after implantation into animal corneas.

Objective To observe the expressions of matrix metalloproteinase-9 mRNA and the change of cerebral edema after diffuse brain injury in rats and discuss their correlation.Methods Marmaruu's diffuse brain injury model of rat was made.Real-time quantitative RT-PCR,dry-wet meth- od,histological techniques and electron microscope were used to determine the expressions of MMP-9 containing water in brain tissue and inflammatory reaction and uhrastructural changes of blood capillary at different time phases after truama.Results The expressions of MMP-9 mRNA started to increase at 1 hour,peaked at 12 hours(P

BACKGROUND:Theex-vivo expanded autologous adipose-derived stem cels have the capability of multipotential differentiation and have a broad application prospect in the field of tissue engineering and regenerative medicine. OBJECTIVE:To observe the nasal mucosal structural repair and functional reconstruction usingex-vivo expanded autologous adipose-derived stem cels. METHODS:Ten patients with mucosal damage due to the physical or chemical factors were enroled, including six cases of mucosal scar and four cases of mucosal ulceration. Autologous adipose tissue was extracted forin vitro isolation, culture and expansion of adipose-derived stem cels. Before transplantation, quality safety testing was done. Al the patients were injected adipose-derived stem cels (1×107/cm2 0.1 cm mucosal tissue sample at 30 days before and after transplantation for hematoxylin-eosin staining, Masson ) at an interval of 15 days, totaly for three times. Nasal volume, minimum cross-sectional area, and mucociliary clearance function were determined at 30, 90, 150 days after the final injection. Three of 10 patients were selected to take a 0.1 cm× trichrome staining, and AB-PAS staining. RESULTS AND CONCLUSION:Clinical symptoms were aleviated in al patients undergoing transplantation of adipose-derived stem cels. Compared with the baseline data, the nasal volume and minimum cross-sectional area were both decreased at 30, 90, 150 days after transplantation (P < 0.05), and the mucociliary clearance function was improved but not significantly (P > 0.05). Compared with the baseline data, the inflammation of the nasal mucosa was significantly reduced, colagen fibers arranged neatly, the deposition was decreased, and mucin secreted from goblet cels was increased in the selected three patients at 30 days after cel transplantation. These findings indicate thatex-vivo expanded autologous adipose-derived stem cels can be used to reconstruct the nasal mucosal structure and its function.

This article describes the progress of developing the training base and training methods for bronchoscopists at Changhai hospital in recent years,and then discusses the potential issues and solutions that might occure in the course of training,and finally explores the model and methodology to optimize the training program for Chinese bronchosocpists.

Objective To discuss the outcome of repair of limbs bone defect by using mineralized collagen graft.Methods The clinical data of 35 cases who diagnosed the existence of bone defect from January 2013 to December 2013 in our department were retrospectively analyzed.After operation,Lane Sandhu X-ray score standard was evaluated.Results All patients were followed up for 12 months.Postoperative 1 month,Lane Sandhu X-ray score was 3 points in 20 cases and 15 cases with 2 pointss;postoperative 6 months,Lane Sandhu X-ray score was 9 points in 21 cases,10 cases with 8 points and 4 cases with 7 points.Postoperative 12 months,Lane Sandhu X-ray score was 12 points in 28 cases,7 cases with 11 points.The scores of postoperative 6 months were better than the scores of postoperative 1 month [(2.60±0.49)points vs.(8.49±0.12)points,t=107.860,P=0.000].There was significant difference between the scores of postoperative 12 months and scores of postoperative 6 months [(8.49±0.12)points vs.(11.8±0.06)points,t=41.630,P=0.000].Conclusion MC is used as an effective bone substitute material,and its clinical effect is good.

Abstract: Objective　This article summarizes the clinical characteristics and diagnosis and treatment experience of an elderly patient infected with Omicron variant BA.5.1.3 of COVID-19 in Hainan Province. Methods　The clinical data and treatment of an elderly patient infected with Omicron variant BA.5.1.3 of COVID-19 admitted to Haikou designated hospital on August 15, 2022 were retrospectively analyzed. Results　A 107-year-old female patient was admitted to the hospital with "fever and cough for 1 day". Two of her family members have infected with COVID-19. The patient initially developed fever, accompanied by cough, expectoration, a little white sticky sputum, accompanied by sore throat, muscle pain, fatigue. Nucleic acid test was positive in throat swab, indicating Omicron variant BA.5.1.3 infection. The patient was diagnosed as mild COVID-19 and treated with antiviral therapy, Chinese medicine conditioning, anticoagulation, electrolyte disorder regulation and symptomatic treatment for 9 days. The patient's clinical symptoms were relieved, and she was cured and discharged after two negative nucleic acid tests. One week later, the patient recovered well. Conclusions　Omicron variant BA.5.1.3 is highly infectious, and comprehensive treatment such as antiviral treatment and traditional Chinese medicine treatment has achieved good efficacy. For elderly patients, attention should be paid to maintaining the stability of organ function and internal environment, which is helpful to improve the prognosis of patients.

Humans ; Liver Function Tests ; methods ; Technetium Tc 99m Aggregated Albumin ; Technetium Tc 99m Pentetate

Objective To investigate the neuroimaging features in mitochondrial encephalomyopatbies with lactic acidosis and stroke-like episodes(MELAS).Methods Twenty-two clinically diagnosed patients who came from department of neurology,Huashan hospital in October 2003 to July 2006 were analyzed for CT,MRI,MRI contrast,MRA and MRS.Results In all 22 patients,the neuroimaging results of 21 were positive.There were 9 patients lying in hemisphere,12 in both cerebral hemispheres,including occipital,parietal,temporal and frontal lobe.The abnormal areas showed low signal intensity on T_1-weighted MRI,high signal intensity on T_2-weighted MRI and fluid attenuated inversion recovery(FLAIR)images.The lesions of 12/16 patients on MR contrasted images were enhanced.The lesions of one patient showed malacoma-like changes,one showed Fahr syndrome' s change and another showed high signal intensity on MR contrasted images.Conclusion Although the neuroimaging features of MELAS are complicated,the specific ones could help to make the diagnosis.

OBJECTIVETo study the effect of hyperbaric oxygen (HBO) administered at different pressures and different exposure time on the differentiation of neural stem cells (NSCs) in vitro.

METHODSThe cerebral cortices from newborn rats (0-3 days old) were sterilely collected, digested, and centrifuged. After removal of the supernatant, the cells were re-suspended with DMEM/F12 medium containing B27, bFGF and EGF. The NSCs of 2-3 passages were randomly divided into seven groups: a control (untreated) and 6 HBO treatment groups that NSCs were subjected to HBO treatment of different pressures (1, 2 or 3 ATA) and different exposure time (30 or 60 minutes). The differentiated NSCs were examined by neuron-specific enolase (NSE) immunocytochemistry 24 hrs later. Percentage of NSE positive cells differentiated from NSCs was assessed by fluorescent microscopy.

RESULTSThe percentage of NSE positive cells differentiated from NSCs was the highest in the HBO 2ATA-60 min group (9.17+/-0.50%) (P<0.01), followed by the HBO 3ATA-60 min (7.89+/-0.62%), HBO 2ATA-30 min (6.72+/-0.76%), HBO 3ATA-30 min (6.08+/-0.57%), HBO 1ATA-60 min (5.45+/-0.52%), HBO 1ATA 30 min (3.85+/-0.44%) and control groups (3.72+/-0.88%). In addition to the HBO 1ATA-30 min group, the other HBO treatment groups had increased significantly percentage of NSE positive cells compared with the control group (P<0.01). Under the same pressure, the 60 min treatment groups had increased significantly percentage of NSE positive cells compared with the 30 min treatment groups (P<0.01).

CONCLUSIONSHBO treatment (2 ATA, 60 minutes) produces a best effect in the differentiation of NSCs into neurons.

Animals ; Animals, Newborn ; Cell Differentiation ; Hyperbaric Oxygenation ; Neurons ; cytology ; Pressure ; Rats ; Stem Cells ; cytology ; Time Factors