Nitrogen-doped carbon nanoparticles (N-CNPs) with a fluorescence quantum yield of 15.1％ were prepared from sucrose and urea in oleic acid medium by a one-pot solvothermal method.A new approach for quick,sensitive,and selective determination of free chlorine in water was developed based on fluorescence quenching of N-CNPs.There existed a good linear correlation between the fluorescence quenching and the concentration of ClO-in the range of 0.05-25.00 μmol/L.The limit of detection (LOD,S/N =3) was estimated to be 23 nmol/L.This method can be applied to the determination of free chlorine in real water samples.

Objective To investigate the clinical features and incidence of depression in patients with different lo-cations and pathological types of brain tumors. Methods Hamilton Depression Scale (HRSD) was used to assess the de-pression in 140 patients with brain tumor before and after operation. Results The preoperative mean depression rating score was 15.36 ± 6.52 and the prevalence rate of depression was 50 cases (35.7%) in 140 patients with brain tumor. The postoperative mean score of depression was 9.71 ± 5.55 and the prevalence rate of depression was 9 cases (6.4%) in 140 patients with brain tumor. The postoperative depression score and the prevalence rate was significantly decreased after op-eration (P<0.05)(χ2=36.10,P<0.05). The postoperative depression score in either benign or malignant brain tumors was significantly lower after than before operation(all P<0.05)The postoperative depression score in either the left or right or bilateral brain lesions were significantly decreased after than before operation(all P<0.05).Conclusion Pa-tients with brain tumors have different degrees of depression in perioperative. Depression may be associated with brain tu-mour pathological types and lesion sites in patients with brain tumors.

Objective To discuss the timing and procedures of reoperations on the residual aortic dissection after initial ascending aortic operations on Stanford type A aortic dissection.Methods From March 2009 to November 2011,16 consecutive patients(13 males,3 females) underwent reoperations on the residual aortic dissection.The mean age was 44 years(23-61 years),8 cases was associated with Marfan syndrome.The right axillary artery or femoral artery cannulation was used for cardiopulmonary bypass,cerebral protection was achieved by unilateral antegrade brain perfusion and nasopharyngeal temperature was dropped to 20℃-25℃.The Sun's procedure (total arch replacement with stented elephant trunk implantation) was performed in all patients,concomitant procedure include aortic root replacement (Bentall procedune) in 3 patients,aortic root replacement and coronary artery bypass grafting (Bentall + CABG) in 1 patient,the coronary artery anastomotic leakage repair in 1 patient,mitral valve replacement (MVR) in 1 patient.Results The interval between two operations averaged(66 ±40)months.The means of cardiopulmonary bypass,cross clamp and selective cerebral perfusion times were(193 ± 49)minutes,(90 ±28) minutes and(22 ± 10) minutes,respectively.The mean time to tracheal extubation was(17 ± 10) hours.All patients survived from the operation.One patient suffered from temporary left lower limb paralysis and recovered after treatment during follow-up.Computed tomography angiography (CTA)of aorta was performed on each patient before discharged from the hospital:descending aortic true lumen was significantly expanded,thrombosis of false lumen was found near stent graft.The average follow-up time was 17 (3-42) months,one patient died of aortic rupture 3 months later,one patient underwent total thoracoabdominal aorta replacement 6 months later,one patient with descending thoracic aortic dilatation combined with endometrial tear underwent thoracic endovascular aortic repair.Conclusion Reoperation should be performed as the following condition:the annual growth rate of residual aortic diameter exceeds 0.5 cm/year,the maximal aortic diameter exceeds 5 cm.The Sun's procedure (total arch replacement with the elephant trunk implantation) is safe and effective in the treatment of residual aortic dissection,low mortality and complications was achieved by it,the mid-and long-term results need the further follow-up.

Objective:To observe the motor capacity of patients early after cardiac surgery using a cardiopulmonary exercise test.Methods:Patients who had performed a cardiopulmonary exercise test within 3 months after cardiac surgery were included in this retrospective study. Patients who took the test within 30 days of the operation formed a discharge group ( n=20), those within 30 to 60 days and 60 to 90 days formed the one month and two month groups ( n=10 for both). The discharge group was further divided into an aortic surgery group ( n=9), a bypass surgery group ( n=6) and a valve surgery group ( n=5) according to their procedure. The exercise capacity of each person was measured in terms of the changes in heart rate and systolic pressure from the resting to the anaerobic threshold stage. Anaerobic threshold, peak oxygen uptake and carbon dioxide ventilation equivalent were also recorded. Results:All of the patients completed the cardiopulmonary exercise test above the anaerobic threshold, and no adverse events such as exercise accidents occurred. At the anaerobic threshold the average heart rate of the discharge group was (8.8±7.1)bpm, significantly lower than the averages of the one month and two months groups: (17.0±5.9) and (18.3±10.5)bpm respectively. The average anaerobic thresholds and peak oxygen uptakes of the 1 month and 2 months groups were not significantly different, but they were all significantly higher than the discharge group′s averages. There were, however, no significant differences among the groups in the average changes in their systolic pressure and carbon dioxide ventilation equivalent. Moreover, the average anaerobic threshold and peak oxygen uptake of the aortic surgery group and the bypass surgery group were significantly lower than the valve surgery group′s averages.Conclusions:Postoperative motor ability after cardiac surgery improves significantly for at least 30 days. Patients who have received aortic or bypass surgery have significantly lower exercise capacity than those after valve surgery.

English for science and technology (EST) is the language medium for academic communication among scientists and technologists. The expression of EST is characterized by concise-ness, correctness, objectiveness and understandability. The EST course is regarded as a key process for the undergraduate students to reinforce the English foundation and improve the capacity of English application after their College English study. In this paper, the authors introduced an interest-motivated, output-dominated, snowballing and interactive teaching strategy, according to the accumulated experi-ence of EST teaching in the past few years coupled with the unique medicine-engineering combined characteristics for the major of biomedical engineering.

ObjectiveTo explore the surgical techniques and clinical experiences in treating thoracoabdominal aorta dissecting aneurysm following Sun's procedure.MethodsFrom June 2009 to May 2011,thoracoabdominal aorta replacement was performed in thirteen patients with thoracoabdominal aorta dissecting aneurysm following Sun's procedure in Beijing Anzhen Hospital.Among which,eleven were male,and two were female with a mean age 39.3 years (28 -58 years).All cases were Stanford A aortic dissection,and were underwent Sun's Procedure.The pathogeny of the dissection,ten were Marfan's syndrome,and three were hypertension.Thoracoabdominal aorta dissecting aneurysms were all Crawford type Ⅱ,with the diameter( 5.78 ± 1.00 )cm (4.0 -8.0 cm).All the procedures were performed through combined thoracoabdominal incision via the retroperitoneal approach.And thoracoabdominal aorta was replaced by a tetrafurcate graft with short-time interval circulatory arrest.24 - 30 mm tetrafurcate grafts were selected in all patients.The main graft of the tetrafurcate graft was anastomosed to the elephant truck stent graft.Visceral arteries were joined into a patch and were anastomosed to the other end of the main graft.T6 to T12 intercostal arteries were reconstructed by an 8 mm sidearm.Another 8 mm sidearm was anastomosed to the left renal artery.Both 10 mm sidearms were anastomosed to iliac arteries.Among which,seven were underwent by profound hypothermia with circulatory arrest,and six were underwent off pump with normal temperature.ResultsNo early death.Twelve patients were cured and discharged from hospital.Seven patients were underwent profound hypothermia with circulatory arrest.Among which,one patient had paraplegia,sepsis,pseudomembranous colitis,respiratory failure,and died on 102-day after operation.Another one patient had neurological dysfunction and was cured after six-day's dehydrated treatment.The UFCT showed that the tetrafurcate graft was unobstructed,no distortion,no pseudoaneurysms in all patients.The branch to intercostal arteries was obstructed in three cases,but there were no spinal cord ischemia complications.The mean duration of follow-up was (9.6 ±2.1 ) months (range,1 -24 months),with a follow-up rate of 100％.All the tetrafurcate graft were very well,no obstruction,no distortion and no pseudoaneurysms.There were no cerebral,spiral cord and abdominal viscera ischemia complications in all patients.ConclusionThoracoabdominal aorta replacement after Sun's procedure is simple,and it is helpful to reduce complications.Following Sun's procedure,using tetrafurcate graft with short-time interval circulatory arrest and off pump technique in thoracoabdominal aorta replacement is simple,and it is helpful to reduce complications.

Objective To investigate the long-term outcome of radical prostatectomy (RP) in the patients with incidental prostate cancer (IPCa) detected by surgery of benign prostatic hyperplasia (BPH) and to evaluate the risk factors for residual tumour after BPH surgery and biochemical recurrence in patients with IPCa treated with RP.Methods We retrospectively analyzed the clinical and follow-up data of 45 patients with IPCa detected by surgery of BPH and undergoing RP from January 2004 to October 2016.The age,PSA before and after BPH surgery,prostate volume,T stage and Gleason score after the BPH surgery,T stage at RP (pT0,pT2,pT3),Gleason score at RP and status of biochemical recurrence were recorded.Multivariate logistic regression analysis addressed the association between the factors and the presence of residual cancer after the surgery for BPH.Cox regression was used to analyzed the relationship between the factors and the rate of biochemical recurrence after RP.Results Among 45 IPCa patients,21 patients were stage T1a and 24 were stage T1b.After RP,7 (15.6％) patients had no residual tumor (pT0).PSA before BPH surgery (RR =2.58,95％ CI 1.27-5.42,P =0.04),PSA after BPH surgery (RR =4.26,95％ CI 2.57-7.64,P =0.01) and Gleason score after BPH surgery (RR =3.98,95％ CI 1.85-5.77,P =0.02) were significant associated factors with the residual cancer after BPH surgery.With a mean follow-up of 54 months(ranging 5-144 months),the 5-and 10-years.biochemical recurrence-free survival rates were 95.6％ and 86.7％,respectively.PSA after surgery for BPH (RR =4.79,95％ CI 2.57-7.64,P =0.02) and Gleason score after RP(RR =2.01,95％ CI 1.74-5.21,P =0.04) were the only independent risk factors for biochemical recurrence.Stage (T1a-T1b) did not predict residual cancer or the rate of biochemical recurrence (P ＞ 0.05).Conclusions RP in the patients with IPCa detected by BPH surgery had a good outcome of long-term oncological control.PSA before and after BPH surgery and Gleason score at BPH surgery were the significant associated factors of residual cancer after BPH surgery.PSA after BPH surgery and Gleason score at RP were the only independent risk factors for biochemical recurrence.

Purpose: The unique chromosomal rearrangements of endometrial stromal sarcoma (ESS) make it possible to distinguish high-grade ESS (HGESS) and low-grade ESS (LGESS) from the molecular perspective. Analysis of ESS at the genomic and transcriptomic levels can help us achieve accurate diagnosis of ESS and provide potential therapy options for ESS patients. Materials and Methods: A total of 36 ESS patients who conducted DNA- and/or RNA-based next-generation sequencing were retrospectively enrolled in this study. The molecular characteristics of ESS at genomic and transcriptomic levels, including mutational spectrum, fusion profiles, gene expression and pathway enrichment analysis and features about immune microenvironment were comprehensively explored. Results: TP53 and DNMT3A mutations were the most frequent mutations. The classical fusions frequently found in HGESS (ZC3H7B-BCOR and NUTM2B-YWHAE) and LGESS (JAZF1-SUZ12) were detected in our cohort. CCND1 was significantly up-regulated in HGESS, while the expression of GPER1 and PGR encoding estrogen receptor (ER) and progesterone receptor (PR) did not differ significantly between HGESS and LGESS. Actionable mutations enriched in homologous recombination repair, cell cycle, and phosphoinositide 3-kinase/AKT/mammalian target of rapamycin pathways were detected in 60% of HGESS patients. Genes with up-regulated expression in HGESS were significantly enriched in five immune-related pathways. Most HGESS patients (85.7%) had positive predictors of immunotherapy efficacy. Moreover, immune microenvironment analysis showed that HGESS had relatively high immune infiltration. The degree of immune infiltration in HGESS patients with ZC3H7B-BCOR fusion was relatively higher than that of those with NUTM2B-YWHAE fusion. Conclusion This study investigated the molecular characteristics of ESS patients at the genomic and transcriptomic levels and revealed the potentially high sensitivity of targeted therapy and immunotherapy in a subset of HGESS with specific molecular features, providing a basis for guiding decision-making of treatment and the design of future clinical trials on precision therapy.

Objective To evaluate the growth and survival of single kidney transplants with donation after citizen death (DCD) donors from infants and children (＜3 years of age) to adults.Methods We retrospectively analyzed the data of single kidney transplants with donors from infants and young children to adults in our center.All the recipients were divided into infant donor group (≤3 years of age) and children donor group (1 year＜ age ≤3 years) in terms of the donor's age.The serum creatinine (SCr) level after surgery was determined and the major diameter of the kidney was measured by Doppler B ultrasonography.DGF,vascular complications,urinary tract complications,proteinuria,acute rejection,and infection were recorded during the follow-up period.Results There were 24 cases in infant donor group and 37 in children donor group.The mean follow-up period was 28 months.The SCr level at 1 st month post-transplantation was significantly higher in infant donor group than in children donor group (350.67 ± 35.57 μmol/L versus 193.70 ± 86.76 μmol/L),and the major diameter ((X-)± s) of the kidney in children donor group was significantly greater than that in infant donor group (78.29 ± 4.68 mm versus 93.62 ± 5.57 mm),but there was no significant difference during the subsequent 3-year follow-up period.The incidence of DGF in infant donor group was significantly higher than in children donor group,but there was significant difference in the rate of vascular complications,urinary tract complications,proteinuria,acute rejection,and infection between two groups.Conclusion The single kidney transplants from infants and young children to adults can grow rapidly,and their survival rate is relatively high.

Objective To investigate job satisfaction and influencing factors of medical staff in China.Methods From December 2017 to January 2018, based on the third round third-party evaluation of the Healthcare Improvement Initiative, data on job satisfaction of medical staff at 136 tertiary public hospitals in 31 provinces of China were collected.Chi-square test and binary multivariate logistic regression were used to analyze the influencing factors of job satisfaction.Results The job satisfaction of medical staff at 136 sample hospitals was relatively low. 34.6% of the doctors were satisfied with their job, while the corresponding rate in the nurses was 48.7%. Multi-factor analysis showed that income level, workload, doctor-patient relationship, hospital′s compensation policy, and promotion policy were all significant factors influencing medical staff′s job satisfaction ( workload OR <1, remaining variables OR >1, P <0.05 ). Conclusions Improvement of the medical staff′s job satisfaction depends on optimizing their income distribution policy, increasing their income, improving the promotion policy of professional titles, reducing their workload rationally and building a harmonious relationship between doctors and patients.