Electrochemical deposition of flower-like nanostructured silver particles with a PVA modified carbon cloth cathode.

A novel electrochemical method for preparing flower-like nanostructured silver particles using polyvinyl alcohol (PVA) modified carbon cloth as a cathode is reported. The method does not involve the use of any morphological control agents in aqueous solution. The morphology of the silver nanoparticles obtained was studied using scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The effects of the operating conditions on the deposited silver nanoparticles were investigated. It was found that PVA concentration for carbon cloth modification had a significant effect on the deposited silver morphology. With 1% PVA modification, current density of 10 µA cm-2 and silver nitrate concentration of 1 mM, a flower-like nanostructured silver with petal thickness of 100 nm can be prepared. With the reaction proceeding, silver nanocrystals nucleated on the cathode in a few seconds, then the nuclei grew and the rudimental flower-like silver started to form in 1 min. The perfect flower-like nanostructure of silver was formed in 20 min. However overlong reaction time led to micrometer sized blocks. The specific silver nanostructure growth might be attributed to the silver ion concentration gradient caused by reaction and diffusion rate and the effects of PVA.

In situ synthesis of polypyrrole on graphite felt as bio-anode to enhance the start-up performance of microbial fuel cells.

This study introduces an effective method to deposit polypyrrole (PPy) on graphite felt (GF) as anode to improve the start-up performance of microbial fuel cells (MFCs). The results of scanning electron microscope (SEM) and electrochemical testing reveal that polypyrrole is able to improve the electrical conductivity and surface roughness, which is beneficial to the microorganism attachment and growth. It shows that microorganisms grow faster on polypyrrole-modified anode than on unmodified anode. It takes ca. 5 days for polypyrrole-modified anode to reach a reproducible voltage platform, while it takes 11 days for unmodified anode. Moreover, the maximum power density of microbial fuel cells with polypyrrole-modified anode was 919 mW m-2, which were 2.3 times of that with unmodified anode. This research revealed that polypyrrole modification can improve the start-up performance of microbial fuel cells. It is considered as a feasible, economical and sustainable anode.

Multi-functional photocatalytic fuel cell for simultaneous removal of organic pollutant and chromium (VI) accompanied with electricity production.

It is of significant importance to realize the efficient wastewater treatment and energy recovery. This study presents a multi-functional photocatalytic fuel cell (PFC), which could reductively treat Cr(VI) contaminant and oxidatively degrade organic pollutant simultaneously along with electricity production in an economical strategy. TiO2 nanotube arrays (TNA) and graphite were used as photoanode and cathode in two separated chambers, respectively. The optimized PFC with open circuit voltage of 1.06 V, maximum power density of 1 W m-2 and short circuit current density of 3.7 A m-2 can be obtained by increasing Cr(VI) concentration and decreasing pH values in catholyte. Under optimized PFC conditions, more photogenerated electrons will be transferred to cathode for Cr(VI) reduction, and accelerating electron-hole separation in the photoanode, then facilitating the oxidation of organic pollutants on anode. More than 96.8% removal efficiency for 6.8 mM Cr(VI) with a cathodic efficiency of 95.1% can be achieved within 6 h. Methylene blue (MB), an organic model pollutant, is totally decolorized on photoanode, which is significantly improved compare to photocatalysis (61.5% removal efficiency). The stable cycle operation of this economical PFC has obtained owing to the stable and low cost materials of both photoanode and cathode. This work may provide an efficient and economical method to simultaneously remove two types of pollutants with electricity harvested in one cell.

Experimental porcine model of complex fistula-in-ano.

AIM: To establish and evaluate an experimental porcine model of fistula-in-ano. METHODS: Twelve healthy pigs were randomly divided into two groups. Under general anesthesia, the experimental group underwent rubber band ligation surgery, and the control group underwent an artificial damage technique. Clinical magnetic resonance imaging (MRI) and histopathological evaluation were performed on the 38th d and 48th d after surgery in both groups, respectively. RESULTS: There were no significant differences between the experimental group and the control group in general characteristics such as body weight, gender, and the number of fistula (P > 0.05). In the experimental group, 15 fistulas were confirmed clinically, 13 complex fistulas were confirmed by MRI, and 11 complex fistulas were confirmed by histopathology. The success rate in the porcine complex fistula model establishment was 83.33%. Among the 18 fistulas in the control group, 5 fistulas were confirmed clinically, 4 complex fistulas were confirmed by MRI, and 3 fistulas were confirmed by histopathology. The success rate in the porcine fistula model establishment was 27.78%. Thus, the success rate of the rubber band ligation group was significantly higher than the control group (P < 0.05). CONCLUSION: Rubber band ligation is a stable and reliable method to establish complex fistula-in-ano models. Large animal models of complex anal fistulas can be used for the diagnosis and treatment of anal fistulas.

Sequential recovery of copper and nickel from wastewater without net energy input.

A novel bioelectrochemical system (BES) was designed to recover copper and nickel from wastewater sequentially. The BES has two chambers separated by a bipolar membrane and two cathodes. Firstly, the copper ions were reduced on a graphite cathode with electricity output, and then with an additional bias-potential applied, the nickel ions were recovered sequentially on a copper sheet with electricity input. In this design, nickel and copper can be recovered and separated sequentially on two cathodes. By adjusting the molar ratio of copper and nickel ions to 2.99:1 in wastewater, 1.40 mmol Cu²âº could be recovered with 143.78 J electricity outputs, while 50.68 J electricity was input for 0.32 mmol nickel reduction. The total energy output of copper recovery was far more than the electricity input of nickel reduction. The present technology provides a potential method for heavy metal ion separation and recovery.

Biofeedback-guided pelvic floor exercise therapy for obstructive defecation: an effective alternative.

AIM: To compare biofeedback-guided pelvic floor exercise therapy (BFT) with the use of oral polyethylene glycol (PEG) for the treatment of obstructive defecation. METHODS: A total of 88 subjects were assigned to treatment with either BFT (n = 44) or oral PEG (n = 44). Constipation symptoms (including difficult evacuation, hard stool, digitation necessity, incomplete emptying sensation, laxative dependence, perianal pain at defecation, and constipation satisfaction), Wexner Scores, and quality of life scores were assessed after 1, 3, and 6 mo. RESULTS: At the 6 mo follow-up, the symptoms of the BFT group patients showed significantly greater improvements compared with the PEG group regarding difficult evacuation, hard stools, digitation necessity, laxative dependence, perianal pain at defecation, constipation satisfaction, Wexner Constipation Score, and quality of life score (P < 0.05). The quality of life score of the BFT group at the final follow-up time (6 mo) was 80 ± 2.2. After a complete course of training, improvements in the clinical symptoms of the BFT group were markedly improved (P < 0.05), and the Wexner Constipation Scores were greatly decreased compared with the oral PEG group (P < 0.05). CONCLUSION: We concluded that manometric biofeedback-guided pelvic floor exercise training is superior to oral polyethylene glycol therapy for obstructive defecation.

A review of dihydroartemisinin as another gift from traditional Chinese medicine not only for malaria control but also for schistosomiasis control.

Artemisinin, also known as qinghaosu, is a sesquiterpene lactone endoperoxide extracted from the plant Artemisia annua L, an herb employed in traditional Chinese medicine. Artemisinin and its two main derivatives artemether and artesunate have been shown to be effective against both malaria and schistosomiasis, and therefore, they were described by Liu et al (Parasitol Res 110:2071-2074, 2012b) as the gifts from traditional Chinese medicine not only for malaria control but also for schistosomiasis control. However, another artemisinin derivative dihydroartemisinin (DHA) cannot be neglected. Dihydroartemisinin, a derivative of artemisinin with the C-10 lactone group replaced by hemiacetal and the active metabolite of all artemisinin compounds, was firstly identified as an antimalarial agent, and the dihydroartemisinin-piperaquine combination has been recommended as a first-line treatment of uncomplicated Plasmodium falciparum malaria by the WHO. It has been recently found that administration of dihydroartemisinin at a single dose of 300 mg/kg 2 h or 3, 5, 7, 10, 14, 18, 21, 28, or 35 days post-infection reduces total worm burdens by 1.1-64.8% and female worm burden reductions by 11.9-90.5%, and the in vivo activity of dihydroartemisinin against S. japonicum is enhanced by the use of multiple doses. However, a combination of praziquantel and dihydroartemisinin appears no more effective against S. japonicum schistosomulum than treatment with dihydroartemisinin alone. In mice experimentally infected with S. mansoni, administration with dihydroartemisinin at a single dose of 300 mg/kg on days 1, 7, 14, 21, 28, 35, 42, 49, or 56 post-infection results in total worm burden reductions of 13.8-82.1% and female worm burden reductions of 13-82.8%, and a clear-cut dose-response relationship of dihydroartemisinin against the schistosomula and adult worms of S. mansoni is observed. In addition, dihydroartemisinin was found to cause damages to the reproductive system of female S. mansoni worms, reduce the oviposition of survival worms, and inhibit the formation of granulomas around tissue-trapped eggs. More interestingly, no reduced sensitivity to dihydroartemisinin is detected in praziquantel non-susceptible S. japonicum, which provides a new option for the treatment of S. japonicum and S. mansoni infections, notably in endemic foci with praziquantel resistance or insensitivity detected. It is therefore considered that dihydroartemisinin is another gift from the traditional Chinese medicine not only for malaria control but also for schistosomiasis control.

Dihydroartemisinin: a new story of an old drug against Schistosoma mansoni infection.

Currently, praziquantel is the drug of choice for the treatment of human Schistosoma mansoni infections. It has not been proved until now that there is real praziquantel resistance, but there is decreased praziquantel sensitivity. A search for novel antischistosomal agents against the parasite has been given a high priority. Dihydroartemisinin, formerly identified as an antimalarial drug, has been shown to be active against both Schistosoma japonicum and S. mansoni in mice. Interestingly, dihydroartemisinin is found to be highly effective against the 14-28-day schistosomula of S. mansoni, and treatment with multiple low doses of the drug achieves a high efficacy with reduced toxicity to the host. The long time development from juveniles to adults allows adequate timing for treatment of this neglected tropical disease. It is supposed that dihydroartemisinin, a safe orally administered agent, may be used for the prevention and control of human S. mansoni infections, notably in areas with reduced praziquantel sensitivity or praziquantel resistance detected.

Increasing efficiencies of microbial fuel cells for collaborative treatment of copper and organic wastewater by designing reactor and selecting operating parameters.

Organic matters and copper ions can be collaboratively removed from wastewater using a microbial fuel cell (MFC). High collaborative efficiencies for both organic matter and copper ions removal have not been achieved yet in previous studies. We demonstrate here that high collaborative efficiencies can be achieved by designing reactor construction and selecting operational parameters based on the results of linear sweep voltammetry (LSV). When the MFC was constructed as 1:2 volume ratio of anode to cathode chamber and operated at optimal conditions, 83% COD removal and 87% copper ion removal were obtained at the same time. In addition, the Cu-MFC also performed a high coulombic efficiency (CE) of 89% for organic treatment, a cathodic efficiency of 80% for copper ion removal, and a maximum power density of 2.0 W/m(2).

[Prevalence of human and ovine hepatic hydatid disease diagnosed by ultrasound in Hobukesar Mongolian Autonomous County of Xinjiang].

OBJECTIVE: To investigate the prevalence of human and ovine hepatic hydatid disease in Hobukesar Mongolian Autonomous County of Xinjiang (HMACX)and to evaluate the related strategies for prevention and control of the disease. METHODS: A prevalence screening method was used to screen local residents and sheep for hydatid disease in HMACX. Based on B ultrasound images, the screening programs on people and sheep in different sites were carried and the findings were comparatively analyzed. RESULTS: Findings of B ultrasound images through screening program among human beings showed that the positive rates of hydatid diseases 4.4% (23/521), of cystic echinococcosis and alveolar echinococcosis as 4.0% (21/521) and 0.8% (4/521)respectively. The infection rate on sheep was 3.8% (7/180). The positive rates of human and ovine hepatic hydatid disease in Township Chagangule were higher than in other areas. There was no significant statistical difference noticed on human positive rates between Township Chagangule and other areas. Statistically, significant difference for positive rate in ovine was seen between Township Chagangule and Township Bayinaowa(χ(2) = 4.8259, P = 0.0280). As intermediate host of hydatid disease, the infection rate in sheep was higher than that in human beings at Township Chagangule. CONCLUSION: HMACX remained a highly endemic area for human and ovine hydatid disease.

Immune responses on allograft heart transplantation in inbred rats infected with Echinococcosis multilocularis.

BACKGROUND: Alveolar echinococcosis (AE) is caused by the metacestode stage of Echinococcus multilocularis (E. multilocularis) and is a rare but life-threatening disease. This disease commonly is characterized by an infiltrative, tumor-like growth of the E. multilocularis metacestode in the liver of human. Liver transplantation is an effective therapy for end-stage of hepatic AE, but the characteristics of host immunity associated with E. multilocularis infection with organ transplantation are poorly defined. We hereby aimed to study the immunological status and allograft heart survival in inbred rats with E. multilocularis infection. METHODS: Rat models of AE were established by injecting the E. multilocularis suspension made from E. multilocularis infected tissues into the abdomen of Lewis (LEW) rats. Three months later, in the experimental group, allograft heart transplantation was performed from Brown-Norway (BN) rats to the E. multilocularis infected LEW rats. In the control group, we transplanted hearts from BN rats to healthy LEW rats. The influence of the disturbed immune system in E. multilocularis infected rats on the heart transplantation was assessed, including observation of allograft heart survival time, histopathological examination of grafts and immunohistochemical examination of infiltrating cells (CD4(+) T cells, CD8(+) T cells and eosinophile granulocytes), measurement of interleukin (IL)-4 and interferon (IFN)-γ in the serum by enzyme-linked immunosorbent assay (ELISA) and analysis of CD4(+)CD25(+) regulatory T cells in peripheral blood by fluorescence activated cell sorting (FACS) flow cytometric analysis. RESULTS: The survival time of recipients in the experimental group was prolonged compared with those in the control group. The numbers of graft infiltrating CD8(+) T cells were decreased whereas the graft infiltrating eosinophil granulocytes (CD15(+)) were increased in grafts in the experimental group (P < 0.05). Furthermore, the proportion of CD4(+)CD25(+) regulatory T cells in the peripheral blood was 10.8% on average in the experimental group, which was significantly higher than that in the control group (6.1%). In addition, the level of serum IL-4 in E. multilocularis infected rats was higher than that in the control group rats, whereas the level of serum IFN-γ in experimental group was lower than that in the control group when graft rejection occurred (P < 0.05). CONCLUSIONS: This study suggests that E. multilocularis infection could prolong the allograft survival time through the polarization of Th1/Th2-type cells and induction of CD4(+)CD25(+) regulatory T cells. This strategy may provide a new idea for establishing transplantation tolerance.

[Systemic review of fast-track surgery in patients undergoing laparoscopic colorectal resection].

OBJECTIVE: To evaluate the efficacy and safety of fast track surgery(FTS) in patients undergoing laparoscopic colorectal resection. METHOD: Randomized controlled trials(RCT) or clinical controlled trials(CCT) on fast-track surgery in patients undergoing laparoscopic colorectal resection were obtained from databases including CNKI, Wanfang, PubMed, EMBACE, and Cochrane Library between January 2000 and March 2012. Meta-analysis was performed with RevMan 5.1. RESULT: There were 6 RCTs and 7 CCTs including 1795 patients. There were 955 patients in the FTS group and 840 in the control group. The time to passage of flatus was shorter(WMD=-1.37, 95%CI:-1.55~-1.19, P<0.05), time to resumption of diet/drink was shorter(WMD=-2.62, 95%CI:-2.69~-2.55, P<0.05), length of postoperative hospital stay was decreased(WMD=-1.63, 95%CI:-1.92~-1.34, P<0.05) and the incidence of postoperative complications were less(OR=0.52, 95%CI:0.41~0.67, P<0.05) in the FTS group. However, there were no differences in readmission(P>0.05). CONCLUSION: Fast-track surgery in patients undergoing laparoscopic colorectal resection can promote bowel function recovery, decrease the incidence of postoperative complications and length of hospital stay.

Community survey, treatment and long-term follow-up for human cystic echinococcosis in northwest China.

BACKGROUND: Human cystic echinococcosis (CE) is a parasitic zoonosis of major public health importance throughout the world. CE is endemic throughout central Asia including northwestern China. In China, CE has been reported in 21 provinces, autonomous regions and municipalities, covering approximately 87% of China's territories. It is most common in the pastoral and semi-pastoral western provinces and regions. This study aimed to reveal the natural history, curative effect and possible re-infection risk factors of human CE through long termed follow-up of treated and untreated CE cases in Hobukesar, Xingjiang, China. METHODS: Follow-up studies on CE were performed twice in Hobukesar from August 2005 to October 2008, after an initial mass screening performed in 1995 and 1996. Ultrasound scan was the primary diagnostic method. RESULTS: Among 24 patients with confirmed CE, 22 were treated (surgery in 19 and chemotherapy in three). Two recurrent cases and one re-infection case were subsequently found during follow-up. The CE type of one of the recurrent cases reverted from CE4 to CE3, as classified using World Health Organization (WHO) guidelines. CONCLUSIONS: Ultrasound was required to differentiate primary, recurrent and re-infection cases during epidemiological investigation and follow-up of CE. Most patients did not change their habits, which may be one possible cause of reinfection. One recurrent case suggested that, despite initial suggestion from the WHO Informal Working Group on Echinococcosis, CE4-type cysts are not inactive.

Therapeutic effect of osteogenically induced adipose derived stem cells on vascular deprivation-induced osteonecrosis of the femoral head in rabbits.

OBJECTIVE: To explore the therapeutic effect of osteogenically induced adipose-derived stem cells (ADSCs) on vascular deprivation-induced osteonecrosis of the femoral head (ONFH) in rabbit model. METHODS: Vascular deprivation-induced ONFH was established by intramuscular injection of methylpre- dnisolone, and vascular occlusion of the capital femoral epiphysis by electrocoagulation in adult New Zealand white rabbits. Eight weeks after the establishment of vascular deprivation-induced ONFH, animals were randomly divided into three equal groups. In Group A (control), no therapy was given. In Group B, core decompression was performed by drilling a hole (1.2 mm in diameter) from the outer cortex 2.5 cm distal to the proximal end of the greater trochanter. In Group C, 1 multiply 10(7) osteogenically induced ADSCs were resuspended in 0.5 ml PBS, and then injected directly into the femoral head. Femoral head specimens were obtained at postoperative 8 weeks. The bone formation and three-dimensional microstructure of the femoral head was evaluated by micro-computed tomography scans. Immunohistochemical analysis was performed to detect the expression of osteocalcin. Angiogenesis and repair of the femoral head were observed histologically. RESULTS: In trabecular bone at the proximal femur region, the trabecular volume was higher in Group C (130.70 mm(3)+/-4.33 mm(3)) than that in Groups A (101.07 mm(3)+/-7.76 mm(3)) and B (107.89 mm(3)+/-8.68 mm(3), P less than 0.01). Bone volume was significantly increased in Group C (40.09 mm(3)+/-6.35 mm(3)) than in Groups A (29.65 mm(3)+/-4.61 mm(3)) and B (31.80 mm(3)+/-4.01 mm(3), P less than 0.01). The trabecular number was higher in Groups C (1.58+/-0.25) than other two groups (1.15+/-0.18, 1.16+/-0.21, P less than 0.01). Bone mineral density showed statistically significant difference between Groups C and A or B (375.38+/-23.06) mg HA/ccm, vs (313.73+/-19.30) mg HA/ccm and (316.09+/-16.45) mg HA/ccm, P less than 0.01). Histological examination indicated that there was more new bone formation in Group C than in other groups. CONCLUSION: Treatment with autologous osteogeni-cally induced ADSCs transplantation results in an enhanced osteogenesis and microstructure of the vascular deprivation-induced osteonecrosis in rabbits.

Can bisphenol A diglycidyl ether (BADGE) administration prevent steroid-induced femoral head osteonecrosis in the early stage?

Steroid-induced osteonecrosis of the femoral head (ONFH) is associated with increase of intraosseous pressure caused by elevating of adipogenesis and fat cell hypertrophy in the bone marrow, which subsequently decreases the blood flow in the femoral head and finally resulting in bone ischemia. The early femoral head-preserving method has mainly focused on the conventional core decompression procedure. However, it only achieves a slight decrease in intra-medullary pressure with limited clinical outcome. The crucial point in prevention is to achieve a thorough decompression of intra-medullary pressure and improvement of microcirculation of the femoral head. Bisphenol-A-diglycidyl ether (BADGE), an antagonism of PPAR-γ(Peroxisome proliferator-activated receptor gamma), has been shown to successfully reverse bone marrow adipogenesis and fat cell hypertrophy, enhances proliferation of osteoblasts, inhibit osteoclastogenesis. Therefore, we hypothesized that BADGE administration may be an appropriate novel method for the prevention of early stage steroid-induced ONFH.

Phenol degradation on novel nickel-antimony doped tin dioxide electrode.

Nickel and antimony doped tin dioxide is a novel anodic material for its good performance of electrochemical ozone generation and direct electro-catalytic oxidation. Electro-catalytic oxidation of phenol on this novel nickel-antimony doped tin dioxide electrode is presented here. The morphology and composition of the electrode are characterized. The effects of applied current densities on phenol degradation rate, energy consumption and coulomb efficiency are discussed. In 0.1 M sulfuric acid, after 4 h electrolysis with current density of 25 mA cm(-1), 90% phenol is removed. And with current density of 20 mA cm(-1), the highest energy efficiency of 6.85 g kWh(-1) and the highest coulomb efficiency of 6.87 µg C(-1) are obtained. The effect of current densities on TOC removal is also discussed.

[Meta-analysis on the correlation of cholecystectomy or cholecystolithiasis to risk of colorectal cancer in Chinese population].

BACKGROUND AND OBJECTIVE: It is reported that the incidence of colorectal cancer is higher in patients receiving cholecystectomy (CHE) than in those who did not. However, the correlation of CHE and cholecystolithiasis (CHO) to colorectal cancer is unclear. This study was to investigate the correlation of CHE or CHO to risk of colorectal cancer in Chinese population. METHODS: A meta-analysis was conducted according to the guidelines set forth by the meta-analysis of observational studies in epidemiology (MOOSE statement). A manual and computer search of literature was performed. Included literatures were evaluated using the Newcastle-Ottawa Scale. Original data were extracted, pooled odd ratio (OR) and 95% confidence intervals (Cl) were calculated using revman 5.0. RESULTS: In total 26 studies were included. The pooled OR between CHO or CHE, CHE alone, CHO alone and colorectal cancer were 3.00 (95%IC 2.30-3.91), 2.85 (95%IC 2.13-3.81) and 2.68 (95%IC 1.93-3.72), respectively. Sub-group analysis in sex and position of tumors revealed obvious correlation of CHE or CHO to colorectal cancer except for the men's subgroup. CONCLUSION: CHE or CHO may be associated with colorectal cancer in Chinese population.

Simultaneous alveolar and cystic echinococcosis of the liver.

Alveolar echinococcosis (AE) and cystic echinococcosis (CE), caused by infection with the larval stages of Echinococcus multilocularis and E. granulosus, respectively, are of major clinical importance. Reports of infection with AE or CE are very common, but instances of simultaneous or dual infection are rare. We report on four cases with mixed AE/CE infections in the liver, diagnosed using retrospective surgical records and active community surveys in southern Ningxia Hui Autonomous Region (NHAR), PR China, a recognized hyperendemic area for echinococcosis.

Combined ultrasound and serologic screening for hepatic alveolar echinococcosis in central China.

Alveolar echinococcosis (AE), caused by Echinococcus multilocularis, is a zoonotic helminthic disease that can mimic malignancy. In the 1970s, foci of the disease were found in central China. The aim of the present study was to estimate the prevalence of AE in humans in 2 districts of south Gansu Province, China, by use of ultrasound and Echinococcus serology. After answering an epidemiological questionnaire, 2,482 volunteers from 28 villages underwent ultrasound. Serology via enzyme-linked immunosorbent assay for antibody activity was performed on whole blood collected on filter paper in all subjects; on serum from subjects with an abnormal ultrasound image; and on randomly chosen subjects that either had no lesions or had atypical lesions. At least one (25.3%) abnormal ultrasound image was observed in 630 of the subjects screened. A typical lesion of progressive AE was found in 84 subjects (3.4%). Serologies were positive in 77 (96%) of 80 of patients who had lesions typical of progressive AE. Ultrasound is useful for screening for AE in endemic regions.