Jun Li

Harbin Medical University, Charbin, Heilongjiang Sheng, China

Are you Jun Li?

Claim your profile

Publications (23)30.97 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Objectives: We retrospectively analyzed the long-term outcomes of simultaneous or staged urinary diversion and kidney transplantation. Patients and Methods: Between June 2001 and December 2012, 4 patients with dysfunctional bladder resulting from spina bifida (n = 3) or bladder contraction following urologic tuberculosis (n = 1) underwent cadaveric kidney transplantation and urinary diversion simultaneously (n = 3) or 6 months post-transplantation (n = 1). Urinary diversion consisted of cutaneous ureterostomy in 1 patient and ileal conduits in 3 patients. All patients were followed prospectively. Results: All 4 patients received deceased donor transplants. Median follow-up was 110.5 months (range 50-120). At the last follow-up, serum creatinine levels ranged from 1.1 to 1.8 mg/dl. One patient with a functioning graft died of severe cirrhosis 105 months following transplantation. Graft function remained stable without any severe complications in 3 patients. Hematoma (Clavien-Dindo grade IIIa) and urinary leakage (grade II) occurred in 1 patient in the early postoperative period, but no surgical revision was required. Two patients developed cytomegalovirus pneumonia. Urinary tract infection was a common problem in all patients. Conclusions: For patients with lower urinary tract dysfunction, simultaneous kidney transplantation and urinary diversion with an ileal conduit may be a safe, feasible approach, with a satisfactory long-term outcome. © 2013 S. Karger AG, Basel.
    Urologia Internationalis 09/2013; · 1.07 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Abstract Objectives: To evaluate whether the outcomes of renal grafts from living related donors more than 60 years old are acceptable, in terms of renal function and patient/graft survival. Material and Methods: Twenty-one patients who received kidneys from donors older than 60 years constituted the study group (Group 1). The control group (Group 2) consisted of 110 patients who received renal transplants from ideal donors, aged 18 to 45 years. The recipients were analyzed for posttransplantation serum creatinine, the number of acute rejection episodes and delayed graft function, and patient/graft survival. Results: The mean age of donors was 62.6 ± 2.2 years in Group 1 and 32.8 ± 7.0 years in Group 2. Recipient serum creatinine was higher on postoperative day 1, year 1, year 5 in Group 1 than that in Group 2 (536.8 ± 203.3 vs. 409.8 ± 213.8, 142.4 ± 38.2 vs. 100.3 ± 22.9, 152.6 ± 42.7 vs. 107.1 ± 22.1, respectively; all p < 0.05). Acute rejection was seen in 4 cases in Group 1 (19.0%) and in 15 cases in Group 2 (13.6%; p = 0.759). Delayed graft function was seen in two cases in Group 1 (9.5%) and in four cases in Group 2 (3.6%; p = 0.540). One-, 3- and 5-year patient survival was 100%, 100% and 100% for Group 1, and 97%, 97% and 97% for Group 2. Corresponding death-censored graft survival was 100%, 100% and 100% for Group 1, and 98%, 98% and 96% for Group 2. No significant difference was observed in terms of patient/graft survival. Conclusions: Although compromising renal function, donor age did not affect patient and graft survival in the 5-year follow-up in our study. Age alone seems not to be an exclusion criterion to living kidney donation.
    Renal Failure 08/2013; · 0.94 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background/Aims: While there are drug exposure equation models based on limited sampling times for mycophenolate mofetil (MMF), there are few for enteric-coated mycophenolate sodium (EC-MPS), and none that studied Chinese individuals. Our objective is to generate the optimal model equations for estimation of the mycophenolic acid (MPA) area under the plasma concentration-time curve from 0 to 12 h (MPA-AUC0-12h) with a limited sampling strategy (LSS) for renal transplant recipients receiving EC-MPS. Methods: The pharmacokinetics in 31 Chinese renal allograft recipients treated with EC-MPS in combination with tacrolimus and steroids were determined. The model equations were generated by multiple stepwise regression analysis for estimation of the MPA-AUC. Results: A total of 31 patients with an average age and weight of 37.58 ± 10.9 years and 60.9 ± 10.7 kg, respectively, were included. Mean serum creatinine and glomerular filtration rate were 112.2 ± 17.7 μmol/l and 65.6 ± 14.6 ml/min, respectively. The mean values of AUC0-12h, pre-dose MPA trough concentration (C0), maximum concentrations (Cmax), and time to reach Cmax (Tmax) were 61.17 ± 26.39 mg·h/l (range 22.9-123.0 mg·h/l), 4.98 ± 4.65 mg/l (range 0.13-20.04 mg/l), 17.54 ± 10.67 mg/l (range 4.08-42.36 mg/l), and 5.0 ± 2.6 h (range 1.0-10.5 h), respectively. The best predictive equation for estimation of MPA-AUC0-12h was -3.63 + 8.35 × C4 + 17.04 × C7 + 13.74 × C12 (r(2) = 0.7491), prediction bias (PE%) was 20.9 ± 20.37, and prediction precision (APE%) was 3.66 ± 29.20. Conclusions: This model provides an effective approach for estimation of full MPA-AUC0-12h in Chinese adult renal allograft recipients treated with EC-MPS and tacrolimus.
    American Journal of Nephrology 05/2013; 37(6):534-540. · 2.62 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We investigated how cytochrome P450 (CYP) 3A5 polymorphism affects pharmacokinetics of tacrolimus and its interaction with diltiazem in Chinese kidney transplant recipients. Sixty-two CYP3A5 expressers and 58 non-expressers were, respectively, randomized to receive diltiazem supplement or not. Their pharmacokinetic profiles were acquired on 14th day, sixth month, and 18th month post-transplant and compared among groups. A dosing equation was fit based on above data with CYP3A5 genotype and diltiazem co-administration as variables. Then, necessary initial doses with or without diltiazem were calculated and used in 11 CYP3A5 expressers, respectively, when another 11 expressers received routine doses as control. Trough concentration was measured on the third-day post-transplant and patients failed to reach target range were presented in percentage. These two parameters were compared among three groups. Patients were followed up until June 2010, kidney function, biopsy-proved acute rejection, and other adverse events were monitored. Results showed that CYP3A5 expressers needed more tacrolimus to reach therapeutic concentration window and were more susceptible to diltiazem-induced concentration increase than CYP3A5 non-expressers. CYP3A5 polymorphism-guided dosing equation helped to determine appropriate initial doses of tacrolimus in individuals. In conclusion, CYP3A5 polymorphism profoundly influences pharmacokinetics of tacrolimus and helps to individualize tacrolimus dose.
    Clinical Transplantation 02/2013; · 1.63 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: OBJECTIVES: To compare the efficacy and safety of thymoglobulin compared with basiliximab in patients who had kidney transplants and are at high risk for acute rejection and delayed graft function. MATERIALS AND METHODS: A retrospective review of patients who had 1 or more risk factors for acute rejection and delayed graft function and who were given either thymoglobulin or basiliximab for induction therapy. Incidences of acute rejection, antibody-treated acute rejection, delayed graft function, chronic rejection, cancer, infection, leucopenia, and thrombocytopenia were compared between thymoglobulin and basiliximab groups. Serum creatinine levels within 1 year and long-term graft and patient survival also were compared. RESULTS: A total of 327 patients were included. Incidences of acute rejection, antibody-treated acute rejection, delayed graft function, and chronic rejection were significantly lower in the thymoglobulin group than in the basiliximab group (P < .05). Serum creatinine levels were lower in the thymoglobulin group on postoperative days 7, 14, and 30 (P < .05). There were no statistically significant differences regarding long-term graft and patient survival, cancer, or total infection rate between the groups. Incidences of Cytomegalovirus infection, leucopenia, and thrombocytopenia were significantly higher in the thymoglobulin group (P < .05). CONCLUSIONS: Thymoglobulin may improve short-term outcomes, compared with basiliximab, in patients who had kidney transplants and are at high risk for acute rejection and delayed graft function. However, long-term outcomes are similar with thymoglobulin and basiliximab.
    Experimental and clinical transplantation : official journal of the Middle East Society for Organ Transplantation. 11/2012;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Compared with rare CD4+CD25+ regulatory T cells (Tregs), CD4+CD25- T cells are abundant in peripheral blood. Studies have demonstrated that tumors can convert naive CD4+CD25- T cells into CD4+CD25+Foxp3+ Tregs; however, the potential application of the converted Tregs in transplant medicine has not well demonstrated. CD4+CD25- T cells isolated cultured for 5 d in various combinations of cell culture medium and conditioned medium from RenCa cells. Foxp3 levels were determined by flow cytometry and real-time polymerase chain reaction. BALB/c mouse mononuclear cells (responder) combined with different ratios of the converted CD4+CD25+ Tregs were co-cultured with inactivated C57BL/6 mononuclear cells (stimulator) in one-way mixed lymphocyte reaction (MLR). In addition, the converted Tregs were transferred into a mouse skin transplant model, and graft histology, survival time, and delayed-type hypersensitivity were assessed. CD4+CD25- T cells cultured in media supplemented with increasing concentrations of RenCa conditioned medium were partially converted into CD4+CD25+ Tregs; conversion increased as the percentage of conditioned medium increased. Moreover, the converted CD4+CD25+ Tregs possessed characteristics similar to those of naturally occurring Tregs, including Foxp3 expression and the ability to suppress T cell proliferation in one-way MLR in a concentration-dependent manner. Immunosuppressive effects of the converted CD4+CD25+ Tregs were also similar to those of naturally occurring Tregs in vivo, suppressing allograft rejection and prolonging survival time of allogeneic skin grafts following adoptive transfer in mice (P<0.05). Our findings indicate that CD4+CD25- T cells cultured with conditioned media from tumor cells may be useful for obtaining sufficient numbers of Tregs, which may help suppress acute rejection and prolong graft survival.
    Journal of Surgical Research 12/2011; 171(2):797-806. · 2.02 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To determine the incidence of BK virus associated nephropathy (BKVAN) in renal-transplantation recipients, observe its histological features. A total of 137 renal allograft biopsy specimens collected at our hospital during December 1999 to January 2008 were analyzed by routine histologic examination, immunohistochemistry and transmission electron microscopy (TEM) to screen for BKV. The case records of involved recipients were accessed to know their clinical manifestations, diagnostic characteristic and treatment regimens at that time. And the 1-, 3-year graft survival rate were analyzed by Kaplan-Meier analysis. A total of 16 renal biopsy specimens (11.7%) were positive for BKV. Viral particales on the size of 35 - 40 nm were seen in the tubular epithelial cells of 3 biopsy specimens and 7 urinary sediment samples. The numbers of BKVAN recipients suffering acute rejection, using ALG/ATG/OKT3 and using FK506+MMF immunosuppressive protocol were 7, 7 and 10 respectively. In 14 cases of BKVAN, there was an elevated level of serum creatine concentrations. Four cases lost their grafts after using a large dose of immunosuppressives. And renal functions improved by a reduction of immunosuppression or a replacement of FK506 with CsA in 8 cases. And graft functions deteriorated or had already failed in the remaining 4 cases whose immunosuppressive protocol were not changed. The 1-, 3-year graft survival rates were 81.3% and 54.2% in BKVAN recipients respectively. The diagnosis of BKVAN should be considered in recipients when their graft functions are deteriorating, especially for those with the accompanied risk factors. The morphological hallmarks of BKVAN are similar to those of acute rejection. The differentiation may be made by either immunohistochemistry or TEM. A proper modification of maintenance immunosuppression is effective in slowing down the progression of BKVAN.
    Zhonghua yi xue za zhi 09/2011; 91(34):2402-6.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Thymus transplantation enables recipient T cells to develop and mature within the donor thymus and achieve donor-specific transplantation tolerance. The relationship between the volume of the vascularized graft and the extent of tolerance induced to it remains unclear and needs further investigation. Adult male Fischer and Rowett nude rats (8-10 weeks old, 200-250 g) were used as donors and recipients of allogeneic thymus grafts. Rowett nude rats were randomly divided into three groups: Group A, sham-grafted controls (n=5); Group B, recipients of whole thymus (including two thymic lobes) (n=10); Group C, recipients of one thymic lobe (n=8). The animal body weight and survival were monitored postoperatively. Histological examination was used to monitor graft survival. Graft function and tolerance induction were assessed by mixed lymphocyte reaction (MLR), flow cytometry (FCM), and full-thickness skin graft studies. All animals survived. After 16 weeks, the vessels supplying blood to the thymus graft were patent and histologically the grafts had normal corticomedullary architecture. Body weight increased to the greatest extent in Group B (p<0.05). After 5 weeks, FCM showed that the percentage of CD3+ T cells in peripheral blood was higher in Group B than Group C (p<0.05). MLR and skin graft studies showed that the thymus grafts had re-established a peripheral blood T lymphocyte function in Groups B and C and induced low donor-specific immune responses. Skin allografts had survived 2-3 days longer in Group B than in Group C. Additionally, the lymphocyte reaction to the donor was lower in Group B than Group C (15.1% vs 20.5%), but the lymphocyte reaction to third-party cell stimulation was stronger in Group B than Group C (94.4% vs 22.1%). Thus, larger graft volume (whole thymus) is more conducive to immune system reconstitution in the recipient and protecting the donated graft from rejection.
    Transplant Immunology 03/2010; 23(1-2):40-4. · 1.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The application of immobilized-cell technology in photobioreactor for hydrogen production could offer improvements in photo-hydrogen production rate and light utilization efficiency. Indigenous Rhodopseudomonas palustris CQK 01 was attached to the surface of a cover glass slide in a flat-panel photobioreactor, to form biofilm under illumination with a range of intensities and wavelengths. The morphology and structure of mature photosynthetic bacterial (PSB) biofilm were determined to elucidate the relationship between biofilm formation and hydrogen production performance. The effects of operation conditions on hydrogen production performance of the biofilms formed under various illumination conditions were experimentally investigated. The results showed that illumination wavelength and intensity substantially influenced the morphology and structure of the biofilm, and the hydrogen production performance of mature biofilm varied significantly with the illumination conditions that were used for biofilm formation. Biofilm formed under 590 nm and 5000 lx illumination showed the highest hydrogen production performance.
    Bioresource Technology 03/2010; 101(14):5315-24. · 4.75 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The biofilm technique has been proved to be an effective cell immobilization method for wastewater biodegradation but it has had restricted use in the field of photobiological H2 production. In the present study, a groove-type photobioreactor was developed and it was shown that a groove structure with large specific surface area was beneficial to cell immobilization and biofilm formation of the photosynthetic bacteria on photobioreactor surface as well as light penetration. A series of experiments was carried out on continuous hydrogen production in the groove-type photobioreactor illuminated by monochromatic LED lights and the performance was investigated. The effects of light wavelength, light intensity, inlet glucose concentration, flow rate and initial substrate pH were studied and the results were compared with those obtained in a flat panel photobioreactor. The experimental results show that the optimum operational conditions for hydrogen production in the groove-type photobioreactor were: inlet glucose concentration 10 g/L, flow rate 60 mL/h, light intensity 6.75 W/m2, light wavelength 590 nm and initial substrate pH 7.0. The maximum hydrogen production rate, H2 yield and light conversion efficiency in the groove-type photobioreactor were 3.816 mmol/m2/h, 0.75 molH2/molglucose and 3.8%, respectively, which were about 75% higher than those in the flat panel photobioreactor.
    International Journal of Hydrogen Energy. 01/2010;
  • [Show abstract] [Hide abstract]
    ABSTRACT: Visual experiments were conducted to study the behaviors of liquid droplet coalescence on the surface with gradient surface energy. The microscopic contour of the gradient energy surface, which was fabricated on the base of a silicon chip by diffusion-controlled silanization of alkyltrichlorosilanes, was characterized by atom force microscopy. The effects of droplets on the three-phase contact line and the contact angle were obtained. It was observed that the process of droplet coalescence accelerates the droplet speed on the gradient surface. On the high-energy surface, the triple-phase contact line of the coalescing droplet is prone to pinning. The interfacial energy released from coalescence is the main source for promoting the motion. Furthermore, the nonequilibrium capillary pressure gradient inside coalescence droplets is considered to aid in accelerating the coalescence. KeywordsCoalescence-Contact line-Contact angle-Gradient surface
    Journal of Superconductivity and Novel Magnetism 01/2010; 23(6):1165-1168. · 0.70 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To study the anatomy characters of renal artery and the treatment of multiple arteries in living donor renal grafts. Records of 142 living donors were analyzed in our center. We analyzed the anatomic structure of renal arteries by DSA and CTA pre-transplantation. Thirty-one kidneys with multiple arteries were transplanted after reconstruction. Then clinical effects were compared between multiple-renal-arteries group (n=31) and single-renal-artery group (n=111). The incidence of multiple renal artery was 30.99%, and there was no difference between both sides (left kidney 22.54%, right kidney 22.13%). If the multiple artery occurred in left or right kidney, the incidence of the multiple artery occurred in the other side was 56.25% and 60.00%, respectively. The diameter of left main renal artery was more magnanimous (P=0.001) and the first branch was more closed to abdominal aorta (P=0.004). Operation time and warm/cool ischemia time were longer in the multiple-renal-arteries group. However, estimated blood loss, delayed graft function, acute rejection and flow rate of arcuate artery were similar in both groups, the same as serum creatinine and serum creatinine clearance rate on day 7, 1 month and 3 month post-operation. It was shown by repeated measures ANOVA that graft with multiple arteries didn't affect the tendency of renal function at early time post-operation. Comprehending the character of renal artery and accurate treatment of multiple artery anastomosis are critical for the effect of the living kidney transplantation.
    Zhonghua wai ke za zhi [Chinese journal of surgery] 12/2009; 47(24):1879-82.
  • [Show abstract] [Hide abstract]
    ABSTRACT: BK virus (BKV)-associated nephropathy (BKVAN) in renal transplant recipients is an important cause of renal transplant dysfunction. Our aim was to determine the kinetics of BKV load within one yr after kidney transplantation under the impact of intensive monitoring and reduction in maintenance immunosuppression, the incidence of BKVAN, and the outcome of BKVAN treatment. Urine and peripheral blood (PB) were taken from 90 renal transplant recipients for BKV cytological testing and real-time PCR for BKV DNA at one, three, six, nine, and 12 months after transplantation and treatment. Graft biopsies and urinary sediments of recipients with BKVAN were taken to monitor viral particles by conventional transmission electron microscopy (TEM). By one post-transplant year, urinary decoy cells (median, 8/10 HPF), BKV viruria (median, 2.60 × 10(5) copies/mL), viremia (median, 9.65 × 10(3) copies/mL), and BKVAN occurred in 42.2%, 45.6%, 22.2%, and 5.6% of patients, respectively. The incidence of BK infection was lower in patients who received cyclosporine A (CsA) (28.9%) compared to tacrolimus (FK506) (57.7%) (p = 0.007). An increased hazard of BK infection was associated with the use of FK506 (HR 2.6, p = 0.009) relative to CsA. After reduction in immunosuppression, viremia resolved in 95%, without increased acute rejection, allograft dysfunction, or graft loss. BKVAN was diagnosed in five patients (5.6%). The treatment of immunosuppression reduction was effective (i.e., decreased the viral load and number of decoy cells, and improved graft function) in our five patients with BKVAN. Quantitative count of decoy cells (e.g., >10 per 10 HPF) as a marker of viremia and BKVAN had increased positive predictive values of 85.7% and 57.1%, respectively. Choice of FK506 as immunosuppressive agent is an independent risk factor affecting BKV infection. Monitoring and pre-emptive of immunosuppression reduction were associated with resolution of viremia and showed effective in BKVAN recipients at the early stage without acute rejection or graft loss. Quantitative count of urine cytology is a very convenient, useful, and sensitive method for evaluating BKV infection in renal transplant recipients.
    Clinical Transplantation 11/2009; 24(5):599-609. · 1.63 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The application of a cell immobilization technique to a biofilm-based photobioreactor was developed to enhance its photo-hydrogen production rate and light conversion efficiency. Rhodopseudomonas palustris CQK 01 was initially attached to the surface of packed glass beads to form a biofilm in this experiment. Then, the biofilm photobioreactor (BPBR) was illuminated by light-emitting diodes with light wavelengths of 470, 590 and 630 nm and hydrogen was evolved with glucose being the sole carbon source. Under the illumination condition of 5000 lux illumination intensity and 590 nm wavelength, the BPBR showed good hydrogen production performance: the hydrogen production rate was 38.9 ml/l/h and light conversion efficiency was 56%, while the hydrogen yield was 0.2 mol H(2)/ mol glucose. Furthermore, results show that the highest hydrogen production rate and glucose removal rate were obtained when the glucose concentration is 0.12 M, the optimal pH 7 and optimal temperature of influent liquid 25 degrees C.
    Bioresource Technology 10/2009; 101(3):977-83. · 4.75 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To analyze the clinical characteristics of living-related kidney transplantation (LRKT). From January, 2004 to December, 2008, 175 LRKT were performed including 63 cases (36%) of parent-child relations and 49 cases (28%) of sibling relations between the recipients and donors. Out of 175 donors, 52 were 50 years old or above, 4 had microscopic hematuria (including 2 with also hypertension), 2 had kidney stone, and 2 had high body mass index (BMI). Zero-point graft biopsy was performed in 59 donors, and abnormalities were found in 15 of them. The recipients were at the age of 33-/+10.5 years, and the primary diseases are mainly dominant glomerular nephritis (72.6%, 127/175), and with a few cases of diabetes (4%, 7/175) and hypertensive nephropathy (4%, 7/175). Serum creatinine of the donors was 102-/+22.5 micromol/L at 7 days postoperatively, and 92-/+19.1 micromol/L at one month. One recipient died of severe pulmonary infection. Two recipients underwent graft nephrectomy due to anastomotic stenosis with concomitant acute graft rejection and renal arterial embolism. The one-year survival rates of the patients and grafts were 99.3% and 98.2%, respectively. The incident rates of accelerated rejection and acute rejection were 1.1% and 14.9%, respectively. Other complications included impaired liver function (22.3%), infection (9.7%) and leucopenia (4.6%). The renal arterial stenosis occurred in 2.3% (4/175) of the recipients. The recipients of living-related and cadaveric kidney transplant have different primary kidney disease spectrums. Differential diagnosis and treatment of acute rejection and renal artery or anastomotic stenosis can be of vital importance. Marginal donor kidneys with appropriate inclusion criteria can be safely used for transplantation. With good short-term patient and graft survival, LRKT needs further study to evaluate its long-term effect.
    Nan fang yi ke da xue xue bao = Journal of Southern Medical University 09/2009; 29(9):1878-81.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Potassium persulfate aqueous solution without pH adjustment is used as the cathodic electron acceptor in a two-chamber microbial fuel cell (MFC) in the present study. The performance of the MFC with K2S2O8 solution is evaluated and compared with that of K3Fe(CN)6 solution. The results show that the maximum power density of the K3Fe(CN)6 used MFC doubled that with K2S2O8 solution when fresh aqueous solution is used. However, a significant increase in electrical power generation is observed in the case of the MFC with K2S2O8 solution after 2-day operation under an external resistance of 1000 Ω. This improvement can be attributed mainly to the increased cathode performance as a result of the hydrolysis of the persulfate ion in aqueous solution. It is demonstrated that persulfate can be used as an effective cathodic electron acceptor due to its unique capability of self pH adjustment.
    Journal of Power Sources 01/2009; 194(1):269-274. · 4.68 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The influence of the wettability of the anode microporous layer (MPL) on both cell performance and operation duration of air-breathing direct methanol fuel cells (DMFCs) was investigated. The experimental results demonstrated that a passive DMFC with a hydrophilic MPL (DMFC-L) in the anode gas diffusion layer (GDL) showed performance superior to that with a hydrophobic MPL (DMFC-B), when the performance evaluation was conducted by applying a holding time of 45s at each current density. DMFC-B showed good performance at medium and high current densities when a holding time of 150s was used. The observation of water accumulation on the cathode of DMFC-L indicated that the decreased performance resulted mainly from blockage of the oxygen supply path. The constant-current discharging test showed that DMFC-B exhibited a lower performance at the beginning of discharge. However, it showed a lower rate of water accumulation on the cathode and thereby relatively stable operation. Operating the passive DMFCs at high water evaporation rate confirmed the important role of the wettability of anode GDLs for cathode oxygen transport.
    Journal of Applied Electrochemistry 01/2009; 39(10):1771-1778. · 1.84 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The polyvinyl alcohol (PVA)-boric acid gel granule facilitates the light penetration and mass transport as it has the features of the transparency and adequate porous structure. In this work, a hydrogen production bioreactor with the indigenous photosynthetic bacteria (PSB) Rhodopseudomonas palustris CQK 01 immobilized in a PVA-boric acid gel granule is developed to enhance the rate of photo-hydrogen production. Particular attention is paid to exploring the effects of illumination wavelength and intensity, as well as the effects of concentration, flow rate, pH, and temperature of influent substrate solution on the hydrogen production rate. The immobilized PSB gel granule exhibited the maximum hydrogen production rate of 3.6 mmol/g cell dry weight/h in all tests. The experimental results show that the hydrogen production rate of an immobilized PSB granule illuminated at 590 nm is distinctly higher than that at 470 and 630 nm. Photo-inhibition of the gel granule occurs as the long-wavelength illumination intensity exceeds 7000 lux. In addition, there exists an optimal pH of 7.0 and temperature of 30 °C for PSB immobilized in the granule to produce hydrogen. More importantly, the feasibility of PSB immobilized in the PVA-boric acid gel granule for the enhancement of the photo-hydrogen production is demonstrated.
    International Journal of Hydrogen Energy. 01/2009;
  • [Show abstract] [Hide abstract]
    ABSTRACT: To explore methods of clinical diagnosis and treatment of BK virus (BKV) infection in renal transplant recipients. Urine samples were collected from 227 renal transplant recipients who had undergone renal transplantation at most 48 months to detect the decoy cells. Samples of urine and peripheral blood (BP) were collected to undergo real-time PCR to detect the BKV DNA. Part of the renal-recipients received graft biopsy. The recipients with BKV viruria or viremia were divided into 2 groups: intervention group and control group. The 51 patients of the intervention group had the doses of cyclosporine A (CsA) reduced (n=19), had their doses of FK506 reduced (n=22), or underwent replacement of FK506 with CsA (n=10). And other 29 patients in the control group did not receive any intervention. Acute rejection was intensively monitored. The amount of decoy cells, and BKV load in the urine and PB samples were measured again after 3 months. The positive rates of urine decoy cell, BKV viruria, and viremia in all patients were 33.0%, 33.5%, and 15.4% respectively. In the intervention group, the median levels of decoy cells in urine, and of BKV DNA in urine and PB before intervention were 5.0/10 HP, 1.50 x 10(4) copies/ml and 0 copy/ml respectively ; and the median levels of decoy cell in urine, and of BKV DNA in urine and PB were all 0 after intervention, all significantly lower than those before intervention (all P < 0.01). In the control group, the median levels of decoy cells in urine, and of BKV DNA in urine and PB were 6.0 /10 HP, 0.79 x 10(4) copies/ml, and 0 copy/ml respectively before observation, and the median level of BKV load in urine ofter observation was 2.21 x 10(4) copies/m, significantly higher than that before observation (P < 0.01), however, the median levels of decoy cells in urine and of BKV DNA in PB were 5.0 /10 HP and 0 copy/ml respectively, not significantly different from those before observation ( both P > 0.05). The differences between the levels of urine decoy cells, urine BKV DNA level and blood BKV DNA level of the intervention group were all significantly greater than those of the control group (Z = -2.749, -5.089, -1.996; P = 0.006, 0.000, 0.046 respectively). And during the intervention no acute rejection was observed. Four cases of BKVAN were diagnosed. Treatment of immunosuppression reduction showed effectiveness in 4 BKVAN recipients. The levels of decoy cells in urine, and BKV load in urine and in PB samples were all decreased. The graft functions were improved. Urine cytology is very convenient, useful and sensitive for the evaluation and followup of renal transplant patients, and can reflect renal histological presentation indirectly. Also BKV DNA detection in the urine and peripheral blood is important to screen the evidence of BK reaction in order to prevent irreversible graft damage of BKVAN. The treatment of immunosuppressant reduction and replacement of FK506 with CsA are effective in BKV infection recipients at the early stage.
    Zhonghua yi xue za zhi 08/2008; 88(26):1824-8.
  • [Show abstract] [Hide abstract]
    ABSTRACT: To analyze the characteristics of tuberculosis (TB) in Southern Chinese renal transplant recipients, and summarize the corresponding experiences in diagnosis and management. Retrospectively study 41 documented post-transplant TB cases out of the 2333 patients who received kidney transplantation in the First Affiliated Hospital of Sun Yat-sen University between Jan. 1991 and Apr. 2007. TB in the post-renal-transplant population in Southern China displayed the following characteristics: (i) high incidence within a short time after transplantation, the median interval between renal transplantation and diagnosis of TB was 8 months (range: 1-156 months) and 56.1% were diagnosed within the first year post-transplant; (ii) high prevalence (51.2%) of extra-pulmonary tuberculosis; (iii) high co-infection rate (19.5%), pathogens included candida albicans, pseudomonas aeruginosa, staphylococcus aureus, Acinetobacter haemolyticus and cytomegalovirus; (iv) fever (82.9%), cough (56.1%) and sputum (39.0%) are the most common clinical manifestations; (v) purified protein derivative of tuberculin (PPD) skin test had little diagnostic value in this group with a negative result in all 41 cases; (vi) acute rejection (29.3%) and liver function damage (17.1%) were the main adverse effects of anti-tuberculosis chemotherapy; (vii) mortality of patients with post-transplant tuberculosis reached up to 22.0%. Chinese renal transplant recipients face a high risk of TB because of their immuno-compromised state and epidemiological prevalence of the disease. Therefore, attention should be given to this differential diagnosis in clinical practice. Balancing the benefits and disadvantages of anti-tuberculosis chemotherapy is of importance for this specific population.
    Clinical Transplantation 01/2008; 22(6):780-4. · 1.63 Impact Factor

Publication Stats

73 Citations
30.97 Total Impact Points

Institutions

  • 2013
    • Harbin Medical University
      • Department of Urology
      Charbin, Heilongjiang Sheng, China
  • 2011
    • Sun Yat-Sen University
      • Department of Organ Transplantation
      Guangzhou, Guangdong Sheng, China
  • 2009–2010
    • Chongqing University
      • Engineering Thermophysics Research Institute
      Chongqing, Chongqing Shi, China