As the better disinfectant chlorine dioxide has been applied to disinfect water widely and it will be used more and more.But up to now,the health effect induced by chlorine dioxide and its disinfection by-products has been suspected.The formation,toxicity and control methods of the chlorine dioxide water disinfection by-products are introduced in this paper.In general,chlorine dioxide is becoming an acceptable water disinfectant with its research progress.

5 cm and portal vein tumor thrombus significantly affect the tumor-free survival of the patients.

Objective To study the early diagnosis and management of the patients with acute respiratory distress syndrome (ARDS) caused by cytomegalovirus (CMV) pneumonia after liver transplantation.Methods The clinical data of 8 patients with ARDS caused by CMV pneumonia after liver transplantation in our hospital from April 2001 to May 2004 was retrospectively analyzed. All cases were treated with intravenous infusion of gancyclovir, reduced dosage of cyclosporine A or tacrolimus to 1/3~1/2 of baseline and withdrawal of MMF and prednisone. The patients were subjected to breathing machine assist ventilation and nutrition supply.Results Five patients recovered and 3 died. No one developed acute rejection. Conclusions The key of early diagnosis lies in combining chest X-ray or CT scan with clinical presentation. Administration with anti-viral drugs, adjustment of immunosuppressive agents, management with breathing machine assist ventilation and effective nutrition supply are important for the treatment of patients with ARDS caused by CMV pneumonia after liver transplantation.

Objective To observe the clinical effects of different fluid therapies in treating severe preeclampsia complicated by ascites. Methods Between Jan. 2010 and Dec. 2012, patients with severe preeclampsia complicated by ascites in Shenzhen Maternity and Child Healthcare Hospital were included in this study. The treatment group ( n=55 ) were given intravenous drip of 6% hydroxyl starch 130/0. 4 plus furosemide, and the control group (n=52) received intravenous drip of 5%human serum albumin plus furosemide. The mean arterial pressure, respiratory rate, heart rate, oxyhemoglobin saturation, colloid osmotic pressure, hematocrit and the incidence of acute pulmonary edema were observed and compared between the two groups. Results Twenty-four hours after cesarean section, the mean arterial pressure of the treatment group was significantly lower than that of the control group, whereas heart rate and oxyhemoglobin saturation were significantly higher (all P<0. 05). The incidence of acute pulmonary edema of the control group was 17. 3%, while no patient in the treatment group developed acute pulmonary edema. On the 5th day after surgery, the hematocrit and 24 h proteinuria were significantly lower in the treatment group, while colloid osmotic pressure was higher (all P<0. 05). There was no difference in serum albumin level between the two groups (P>0. 05). The average duration of edema after treatment was significantly shorter in the treatment group [(2. 43±0. 37) d versus (3. 74±0. 59) d, P<0. 01]. Conclusion 6% hydroxyl starch 130/4. 0 plus furosemide can effectively elevate the colloid osmotic pressure, resolve edema, improve hypovolemia, sustain oxygen supply to the organs and decrease the complication of pulmonary edema in patients with severe preeclampsia complicated by ascites.

Objective To investigate the protective effects and mechanisms of granulocyte-colony-stimulating factor (G-CSF)on a rabbit model of chronic myocardial ischemia.Methods Myocardial ischemia models were created by partial ligation of the left anterior descending coronary artery in Japanese white male rabbits.Rabbits were subcutaneously injected with G-CSF (G-CSF group)or saline (control group)for 6 days after myocardial ischemia.The percentage of CD34-positive cells in the peripheral blood was evaluated by flow cytometry,and CD34-positive cells homing and vWF expression in the ischemic myocardium were determined by immunohistochemistry.Results Rabbits in G-CSF group had a higher survival rate than those in control group (P <0.05).Immunohistochemistry of the ischemic myocardium showed that compared with control group,G-CSF group had increased homing of CD34-positive cells on day 7 post-surgery,and more vessels on day 28 post-surgery by anti-von Willebrand factor staining.In addition,we observed an increase in the percentage of CD34-positive cells in the peripheral blood in G-CSF group.Conclusion G-CSF produces an obvious protective effect against chronic myocardial ischemia in rabbits by increasing stem cell mobilization,homing to ischemic myocardium and accelerating neovascularization.

BACKGROUND:Studies have confirmed that the nano-hydroxyapatite/chitosan/alginate composite materials have a certain flexibility and strength and possess a bioactivity similar to human bone.
OBJECTIVE:To explore the effect of the nano-hydroxyapatite/chitosan/alginate composite materials on the repair of rabbit mandible defects.
METHODS:Bilateral mandibular defect models of 10 mm × 5 mm × 5 mm were made in 18 healthy New Zealand white rabbits. Then, the rabbits were divided into two groups:experimental group was implanted with nano-hydroxyapatite/chitosan/alginate composite material, and control group was implanted with hydroxyapatite/chitosan composite. At 4, 8 and 12 weeks after implantation, cone-beam CT was applied to observe implant degradation, cal us growth and bone connection in the defect area;new bone formation was observed by hematoxylin-eosin staining.
RESULTS AND CONCLUSION:The gray values of the bone density in the experimental group and control group gradual y increased with time, and there were remarkably significant differences between the two groups at different time points (P<0.01). At the same time point, the experimental group was superior to the control group in gross observation, cone-beam CT observation, gray value of CT and histological observation (P<0.05). At 4-8 weeks after implantation, the implant materials in the two groups were gradual y degraded with a blurred junction between the defect and bone tissue, and a smal amount of new bone formed tightly integrated to the recipient bone tissue, in which the experimental group was more significant. And during 8 to 12 weeks, the degradation of implanted materials in the two groups was basical y complete, and the implant began to merge with the recipient bone tissue, with further generation of new bone tissue and gradual repair of bone defect area, in which, the experimental group was more obvious. Results show that the nano-hydroxyapatite/chitosan/alginate can repair bone defects effectively, and promote the new bone formation.

B7-H1, a recently described member of the B7 family of costimulatory molecules, is thought to be involved in tumor immune escape by inducing T-cell apoptosis. In order to investigate the relationship between B7-H1 and immune escape of bladder cancer, B7-H1 expression in 50 cases of bladder cancer was detected by using immunohistochemical method. Survival curves were constructed using the Kaplan-Meier method and independent prognostic factors were evaluated using the Cox regression model. Our results showed that the positive rate of B7-H1 immunostaining in normal bladder tissue and bladder cancer was 0 and 72% respectively. The expression of B7-H1 was strongly associated with the pathological grade, clinical stage and recurrence (P<0.05). The survival rate was significantly lower in patients with B7-H1 positive group than in those with B7-H1 negative group and multi-variable analysis revealed that B7-H1 could be regarded as an independent factor in evaluating the prognosis of bladder cancer. It is concluded that the expression of B7-H1 is strongly associated with neoplastic progression and prognosis of bladder cancer. The manipulation of B7-H1 may become a beneficial target for immunotherapy in human bladder cancer.
Antigens, CD/genetics ; Antigens, CD/*metabolism ; Antigens, CD80/genetics ; Antigens, CD80/*metabolism ; Prognosis ; Tumor Escape/*genetics ; Urinary Bladder Neoplasms/*immunology ; Urinary Bladder Neoplasms/metabolism

Objective To study the effect of minielctrocholecystectomy(MEC) for gallbladder stone. Methods The clinical data of 4,200 cases(1991-2000) undergoing MEC were analysed restrospectively; the results of different operotors for the MEC were compared. Results All 4,200 cases were cured. Of them, 41 cases(0.98%) had serious complications, including intraoperative bleeding in 4 cases(0.09%), biliary tract injury in 18(0.43%); stress ulcer in 8(0.19%), and residual stones of biliary tract in 11(0.26%). Conclusions MEC has the following advantages: less trauma, short operation time, fast postoperative recovery and lower expense. The different operotors on MEC have distinguish difference in the results. It is important to preven the complications of MEC.

AIM: To observe the effect of diammonii glycyrrhizinatis (DG) on collagen synthesis induced by angioplasty in rabbits. METHODS: The right common carotid artery of male rabbits were injured with 3.5F balloon catheter. Four weeks after operation, arterial tissure collagen content, serum procollagen type I(PCI), procollagen type Ⅲ(PCⅢ) concentration, neointimal thickness and the rate of stenosis were measured.RESULTS: Arterial tissue collagen content, serum PCI, PCⅢ concentration, neointimal thickness and the rate of stenosis of low and high dose DG group is lower than those of injured group.CONCLUSION: DG could inhibit collagen synthesis and neointimal proliferation of rabbits carotid artery induced by angioplasty. It suggests that DG might have clinical potential prespective in prevention and therapy of restenosis.

AIM: To observe the effect of diammonii glycyrrhizinatis (DG) on collagen synthesis induced by angioplasty in rabbits. METHODS: The right common carotid artery of male rabbits were injured with 3.5F balloon catheter. Four weeks after operation, arterial tissure collagen content, serum procollagen type I(PCI)， procollagen type Ⅲ(PCⅢ) concentration, neointimal thickness and the rate of stenosis were measured.RESULTS: Arterial tissue collagen content, serum PCI, PCⅢ concentration, neointimal thickness and the rate of stenosis of low and high dose DG group is lower than those of injured group.CONCLUSION: DG could inhibit collagen synthesis and neointimal proliferation of rabbits carotid artery induced by angioplasty. It suggests that DG might have clinical potential prespective in prevention and therapy of restenosis.