The paper reviews the basic mechanism of photocatalytic oxidation, the kinds of photocatalyst, the characteristics of TiO2 and the commonly used carriers of TiO 2 photocatalytic oxidation in water treatment, the degradation of organic pollutants in water by photocatalytic oxidation and the applications of this new technique in tap water purification. The photocatalytic oxidation as a new technique of environmental protection is being much con-cerned widely.

Objective To explore the expression of Ki 67 in 72 cases of breast cancer and to analyze the correlation of Ki67 expression with clinicopathological factors and efficacy of neo-adjuvant chemotherapy .To as-sess the prediction value of Ki 67 in selecting neo-adjuvant chemotherapy .Methods Ki67 expression in tumor tissues of 72 cases of breast cancer was detected before and after neo-adjuvant chemotherapy .Tumor tissues are a-chieved by core needle biopsy .Results Ki67 overexpression was found in those with axillary lymph node ( ALN) metastasis, in pathological stage III and tumor diameter >2 cm(P＜0.05).Ki67 expression was not significantly associated with age(P>0.05).Objective response(OR)rate of neo-adjuvant chemotherapy was 84.2%(61/72). Patients with Ki67 over-expression were more sensitive than those with lower-expression(P>0.05).Positive ex-pression rate of Ki67 was reduced significantly by neo-adjuvant chemotherapy(P＜0.05).Positive expression rate of Ki67 was reduced significantly in pathological complete response ( PCR ) group, clinical complete remission (CCR)group and partial response(PR)group.Conclusion The expression of Ki67 may be a potential predictive biomarker for neo-adjuvant therapy response in patients of breast cancer and can provide the basis for individual therapy for breast cancer .

Objective To observe the efficacy of ozone in the inactivation of f2 phage in water. Methods The concentration of ozone in water was measured by iodometry. During the experiment,the suspension of f2 phage was added in the ozonized water, at 5,15,30 min, the f2 phage inactivation rate was calculated. Results Under the same condition of ventilation,in the range of pH regulated in the drinking water sanitary standard,the effect of pH on the inactivation of f2 phage was not obvious, while the chromaticity of water could remarkably influence the inactivation of f2 phage. Conclusion The higher chromaticity of water can interfere the inactivation of f2 phage in water by ozone.

Objective To investigate the clinical characteristics of isolated renal mucormycosis in children. Methods The clinical manifestations,CT,IVU and surgical findings of 3 children with isolated renal mucormycosis were analyzed. Results A three-month newborn presented asymptomatically except for renal mass.The other two children had fever,lumbar pain,hematuria,renal enlargement and tenderness.CT scan showed multiple low density foci in the kidneys.All of the three children underwent nephrectomy and systemic amphotericin B treatment,and the diagnoses were confirmed by pathological examination. Conclusions Isolated renal mucormycosis is a rare fungal infection without predisposing factors,and its clinical characteristics are different from the usual systemic mucormycosis.Early diagnosis,nephrectomy and systemic amphotericin B treatment are necessary for improving the prognosis.

AIM:To determine the right ventricular angiotensin converting enzyme2 (ACE2) activity in adult SD rats under normoxia and hypoxia environment,and to detect the relationship between ACE2 and high altitude heart disease initially. METHODS:Adult male Sprague Dawley (SD) rats were raised under hypoxia environment simulated to high altitude (5 000 m,23 h/d),then divided into hypoxia 1 d,15 d and 30 d groups randomly. The control group was set up under normoxia environment. The right ventricular function,ponderal index,pulmonary artery pressure and right ventricular ACE2 activity were determined. The effect of captopril or nitrendpine on cardiac ACE2 activity in hypoxia 30 d group was also observed. RESULTS:The dramatic up-regulation of cardiac ACE2 expression of mRNA and protein and its activity in hypoxia 30 d group was observed,together with obvious increase in right ventricular function,ponderal index and pulmonary artery pressure. Although captopril or nitrendipine depressed pulmonary artery pressure and cardiac function dramatically,no significant alteration of right ventricular ACE2 activity was detected. CONCLUSION:Chronic hypoxic exposure promotes the ACE2 expression and activity in right ventricular,indicating that ACE2 may be correlated to the changes of cardiac architecture and function induced by hypoxia. Up-regulation of ACE2 expression maybe contribute to the increase in right ventricular ACE2 activity,and pulmonary artery hypertension may not be the main reason for the changes of ACE2 activity under hypoxia environment.

Objective To investigate the distribution and antibiotic resistance of A.baumannii during the last five years in our hospital,the basis for the reasonable clinical use of antibiotic was provided to doctor.Methods The strains of A.baumannii isolated from clinical specimens during 2009-2013 were analyzed by VITEK-32 system,the antibiotic resistance was analyzed by WHONET5.4 software.Results A.baumannii strains were mainly isolated from sputum,accounting for 77.3％;the majority of the strains were isolated from ICU,accounting for 42.3％;the resistance rates of A.baumannii to antibiotics appeared increasing,and over 70％ except cefoperazone-sulbactam and imipenem.Conclusion A.baumannii is the major pathogen,and detection rate of A.baumannii is very high,antibiotic resistance status of A.baumannii is very serious.The management of antibiotic application should be strengthened,and the occurrence and prevalence of antibiotic resistant bacteria should be strictly controlled to prevent outbreak and epidemic of nosocomial infection.

Objective: To investigate the status of hair loss and analyze the influencing factors among university students in Hangzhou City, so as to provide insights into the management of hair loss among university students. Methods: University students were recruited using a convenient sampling method from 4 universities in Hangzhou City in June 2021. The basic characteristics and life styles were collected using online questionnaire surveys. Self-reported hair loss was evaluated using the grading scales for loss of hair (Hamilton-Norwood scale for males and modified Ludwig scale for females), and factors affecting self-reported hair loss were identified among university students using the multivariable logistic regression model. Results: A total of 1 060 questionnaires were allocated, and 1 038 valid questionnaires were recovered, with an effective recovery rate of 97.92%. The respondents included 391 males ( 37.67% ) and 647 females ( 62.33% ), and 463 respondents ( 44.61% ) reported hair loss, including 431 students with mild hair loss ( 93.09% ). Multivariable logistic regression analysis showed that university students in their fourth or fifth years ( OR=1.721, 95%CI: 1.126-2.630 ), art specialty ( OR=0.411, 95%CI: 0.207-0.816 ), overweight or obesity (OR=1.685, 95%CI: 1.050-2.704), diet taste ( sweet: OR=2.131, 95%CI: 1.370-3.316; spicy: OR=1.510, 95%CI: 1.028-2.218; greasy: OR=3.023, 95%CI: 2.015-4.537 ), feeling nervous/anxious (occasionally: OR=1.891, 95%CI: 1.087-3.289; frequently: OR=2.487, 95%CI: 1.337-4.626 ), smoking ( occasionally: OR=1.906, 95%CI: 1.067-3.405; frequently: OR=1.983, 95%CI: 1.050-3.746), family history of hair loss ( OR=1.506, 95%CI: 1.075-2.110 ), perming/dyeing hair ( occasionally: OR=1.795, 95%CI: 1.280-2.517; frequently: OR=3.282, 95%CI: 1.736-6.204), self-perceived oily hair/scalp in the past three months (slightly increased: OR=1.980, 95%CI: 1.477-2.653; significantly increased: OR=5.347, 95%CI: 2.956-9.670) were factors affecting self-reported hair loss among university students. Conclusion The proportion of self-reported hair loss was 44.61% among university students in Hangzhou City, and hair loss was predominantly mild. A family history of hair loss, nervousness/anxiety, diet habits, smoking and frequency of perm/dyeing hair may affect hair loss among university students.

Objectives To observe the effect of continuous positive airway pressure (CPAP)for the treatment of patients with acute cerebral infarction combined with obstructive sleep apnea syndrome (OSAS)and to investigate the influence of CPAP therapy on the recovery of neurological function in patients. Methods From April 2014 to September 2015,68 consecutive patients with acute cerebral infarction combined with OSAS admitted to the Department of Neurology,General Hospital of Wanbei Coal and Electricity Group were enrolled retrospectively. According to whether received the CPAP therapy,they were divided into an observation group (n = 31)and a control group (n = 37). The control group was treated with conventional therapy,and on the basis of the treatment plan of the control group,the observation group was also treated with CPAP therapy. They were all the patients with cerebral infarction who were treated for 14 d. The oxygen desaturation index (ODI),lowest oxygen saturation (LS a O2 ),oxidized low-density lipoprotein (ox-LDL),and superoxide dismutase (SOD)concentration,National Institute of Health Stroke Scale (NIHSS)scores and Barthel index (BI)scores,and the modified Rankin scale (mRS)scores after 3 months before and after the therapy in the patients of both groups were documented. The total effective rate was assessed. Results (1)The ODI and LS a O2 in the observation group and the control group after treatment were better than those before treatment. There were significant differences between the 2 groups (ODI:16 ± 6% vs. 35 ± 21%,26 ± 15% vs. 36 ± 21 %;LS a O2:88 ± 6% vs. 75 ± 11%,80 ± 8% vs. 75 ± 11%;all P < 0. 05). (2)After treatment,ox-LDL of the observation group was lower than that of the control group. There was significant differences between the 2 groups (ox-LDL:487 ± 90 μg/ L vs. 548 ± 77 μg/ L,SOD:111 ± 10 kU/ L vs. 94 ± 15 kU/ L,all P < 0. 01). (3)After treatment,the NIHSS and BI scores of the observation group and the control group were better than those before treatment. There were significant differences (the NHISS scores:5. 2 ± 2. 2 vs. 12. 9 ± 3. 9;7. 6 ± 3. 1 vs. 12. 5 ± 4. 2;the BI scores:88 ± 10 vs. 52 ± 30;81 ± 4 vs. 58 ± 30;all P < 0. 01). The NIHSS and BI scores of observation group were better than those of the control group. There were significant differences (all P < 0. 01). They were followed up for 3 months,the mRS score (1. 3 ± 0. 4)of the observation group was lower than that of the control group (2. 0 ± 1. 1). There was significant difference between the 2 groups (t = 3. 362,P <0. 01). (4)The total effective rate of the observation group and control group was 74. 2% (23 / 31)and 48. 6% (18 / 37)respectively. There was significant difference between the 2 groups (χ2 = 4. 598,P <0. 05). Conclusion The CPAP therapy can alleviate the oxidative stress levels in patients with acute cerebral infarction combined with OSAS in short term and improve the neurological function of patients.

Objective To investigate the relationship between Helicobacter pylori (Hp) infection and carotid atherosclerosis (CAS) progression in patients with high risk of stroke,and to provide clinical evidence for the primary prevention of stroke.Methods Three hundred and thirty-two patients with high risk of stroke were screened from 2 800 people who were consecutively selected and had health examination from June to December 2014 in the Department of Medical Center,General Hospital of Wanbei Coal and Electricity Group.Their clinical information was collected.A total of 267 patients whose carotid ultrasound examinations showed plaques and stenosis were selected for the study.Two hundred and three of the 267 patients who met the screening conditions and completed the follow-up were selected as study subjects.The Hp infection status was detected by the 14C urea breath test and the dynamic progression of CAS was observed.The risk factors of CAS progression were also analyzed.Results Hp infection was found in 170 of 332 patients with high risk of stroke.Among the 267 patients who prompted plaques and stenosis in carotid ultrasound in 2014,203 patients were followed up for 1 year,and 133 patients (65.5％,133/203) were found infected by Hp.Forty-six patients had suggestive carotid stenosis and stenosis aggravating in 2015,31 (67.4％,31/46) of which were found infected by Hp.Logistic regression analysis showed that smoking (OR =1.632,95％ CI 1.275-1.940,P =0.011),systolic blood pressure (OR =1.343,95％ CI 1.105-1.632,P =0.019),low density lipoprotein (OR =1.590,95％ CI 1.188-2.005,P =0.005),oxidative low density lipoprotein (OR =1.732,95％ CI 1.325-2.170,P =0.000) and Hp infection (OR =1.672,95％ CI 1.180-2.154,P =0.016) were independent risk factors for carotid atheroslerosis progression.Conclusions Hp infection was found closely related to CAS progression in patients at high risk of stroke.Positive and effective prevention of Hp infection,advocating smoking cessation and controlling blood pressure and blood fat can effectively reduce the incidence of stroke.

Objective To compare the effectiveness and safety of tranexamic acid and fibrin sealant in joint arthroplasty . Methods The literatures on the application of tranexamic acid and fibrin sealant in joint arthroplasty were retrieved from PubMed , Embase ,Cochrane Library ,CNKI and other internet databases .Two reviewers independently screened the literatures according to the inclusion and exclusion standard .The RevMan 5 .2 software was adopted to conduct the statistical analysis on the extracted da‐ta .Results Four randomized controlled trials(RCTs) and 2 retrospective experiments were included ,involving 449 patients .The meta analysis results showed that tranexamic acid and fibrin sealant had no statistically significant difference in total blood loss[MD= -192 .24 ,95% CI(-496 .16 ,111 .69) ,P=0 .22] and hemoglobin loss amount[MD= -0 .49 ,95% CI(-1 .19 ,0 .20) ,P=0 .16] , had statistically significant difference in the blood transfusion rate[OR=0 .30 ,95% CI(0 .18 ,0 .52) ,P<0 .01] ,and had no statisti‐cally significant difference in the postoperative complications[OR=1 .20 ,95% CI(0 .36 ,3 .99) ,P=0 .76] .Conclusion Tranexamic acid is more effective than fibrin sealant of controlling postoperative transfusion rate in joint arthroplasty .