ObjectiveTo investigate the feasibility and influence factors of a new silver salt method for determination of arsenic in drinking water. Methods Arsenic was determined at different reaction temperature,acidity, specification and addition of zinc granular, fill weight of lead acetate cotton, and the effect of these factors on assay results was observed. Arsenic in drinking water was determined in accordance with standard test methods (GB/T 5750.6) of the new silver method. Results The recoveries of the arsenic were 75.3％ - 93.6％(F =9.21,P ＜ 0.01 ) with reaction temperature at 10 - 30 ℃, and the best reaction temperature was 25 ℃. The recoveries of the arsenic ranged from 80.3％ - 91.6％(F =4.67, P＜ 0.05) when sulfuric acid was 3.0 - 6.0 ml and the best value was 5.0 ml. The recoveries of the honeycomb structural zinc granular(diameter 0.2 - 0.3, 0.3 - 0.4 mm) and button zinc granular were 87.2％, 90.7％ and 83.0％, respectively; the best specification was 0.3 - 0.4 mm. The recoveries of zinc granular weight(3 - 5 g ) were 74.6％ - 91.7％, respectively; the best was 5 g. The recoveries ranged from 79.6％ - 91.3％ with fill weight of lead acetate cotton at 25 - 100 mg, the best fill weight was 50 mg.The recoveries of the arsenic were 90.7％, 92.5％, 81.5％ and 74.2％ with lead acetate cotton length at 0.5 - 2.0 cm,and the best loose-tight degree was 1.0 cm. The stability time of arsine solution was 5.0, 4.0, 2.5 h with corresponding temperature at 20, 25, 30 ℃, respectively. ConclusionsIn order to ensure precision and accuracy of the measurement, it is necessary to control reaction temperature, acidity, specification and addition of zinc granular free from arsenic, fill weight of lead acetate cotton and loose-tight degree in the reaction system.

Adolescent ; Adult ; Child ; Child, Preschool ; China ; epidemiology ; Disease Outbreaks ; Female ; Herbicides ; poisoning ; toxicity ; Humans ; Infant ; Infant, Newborn ; Male ; Middle Aged ; Paraquat ; poisoning ; toxicity ; Risk Factors ; Time Factors ; Young Adult

Adult ; Aged ; Breast Neoplasms ; pathology ; surgery ; Female ; Follow-Up Studies ; Humans ; Lymph Node Excision ; methods ; Mastectomy, Modified Radical ; Middle Aged ; Ultrasonic Therapy ; methods ; Young Adult

ObjectiveTo study the sirolimus (SRL)-associated interstitial pneumonitis,which is a severe side effect of sirolimus therapy. Methods In 7 renal grafts treated with SRL, interstitial pneumonitis (8 times) was diagnosed. One patient suffered a relapse after sirolimus treatment was given again. Two patients received de novo sirolimus treatment, and rest 5 patients were switched from a calcineurin inhibitor-containing regimen to a SRL-based protocol for various indications: chronic allograft nephropathy (n = 4) and cancer (n = 1 ). The patients presented with fever, dyspnea on exertion and the chest X-ray or computed topographic (CT) scan on admission showed bilateral mostly peripheral interstitial infiltrates. ResultsSRL was discontinued in 4 patients and the dose was reduced in the remaining 3 patients. Symptoms were improved within 3-14 days in all patients, the radiographic findings improved within 2-4 weeks, and the lesions were absorbed completely in 2-6 months.ConclusionThe frequency of interstitial pneumonitis appears to be increased in renal transplant patients receiving SRL. Discontinuation or reduced dose of SRL appears to be the safest treatment option for the patients with interstitial pneumonitis.

Objective To investigate the effect of a step-wise diversified teaching mode on cardiac electrophysiology (EP) education. Methods 64 young doctors (male:36, female:28) who studied in EP sub-specialty were enrolled. The atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT) were selected as teaching content. All the doctors were randomly divided into traditional teaching group (TT) and step-wise diversified teaching group (DT) according to cross-over design protocol. In TT group, only teaching and answering the questions by teachers were given to students, for the DT group, in different stages of teaching, multiple teach-ing strategy were combined to complete teaching. T test and Chi square test were used to compare the effect of two teaching methods. Results There was no difference of basic features and time of self-studying between the two groups. In examinations, the students in DT group got higher score than TT group[DT:(92.3±9.8) and (93.1±7.8),TT:(88.3±8.6) and (87.1±10.0),P<0.05], and had better perfor-mance of learning interest, initiative, ability of finding and resolving problems, teamwork spirit and so on. Conclusion The step-wise diversified teaching mode contributes improving the quality of instruction of cardiac EP, moreover, arousing learning interest and initiative, enhancing ability of find-ing and resolving problems, teamwork spirit and so on, which is worthy of wide-popularizing in cardiac EP training.

Objective To prepare hybrid substrate and apply it to detect thiram with surface-enhanced Raman spectros-copy( SERS) which provides unique molecular vibration information .Methods The Au substrate was prepared by deposi-tion of gold film on the silver substrate that had a rough surface .The Au substrate was treated with amination as a linker with the silver sol before the hybrid substrate was formed .With PATP as a probe molecule ,the Raman intensity of PATP on the Au substrate and the hybrid substrate was compared ,respectively .Results and Conclusion PATP had stronger Raman intensity on hybrid substrate than on the Au , and the detection limit was 10 -9 mol/L.This method can be used for quanti-tative detection on the hybrid substrate by SERS .

Objective:To investigate the awareness of diabetic retinopathy (DR) prevention and treatment knowledge of diabetic patients in the community of Shenzhen, and analyze its influencing factors.Methods:A cluster random sampling method was used to select 904 patients with diabetes diagnosed in 6 community health service centers in 2 administrative districts of Shenzhen and included in this study. Questionnaire survey of patients were performed to understand their knowledge of DR prevention and treatment. The multi-factor logistic regression analysis method was used to analyze the related influencing factors of DR prevention knowledge awareness.Results:Among 904 patients, 144 patients (15.93%, 144/904) knew about DR prevention and treatment knowledge. The highest awareness rate were about "Diabetes can affect vision and even cause blindness" (88.60%, 801/904). The lowest awareness rate (6.20%, 56/904) were about "DR treatment methods". About "diabetes requires regular fundus examinations" and "diabetics", the awareness rate of fundus examination interval were less than 50.00%. The results of multivariate logistic regression analysis showed that gender [odds ratio ( OR)=1.595], education level ( OR=2.963, 3.937), monthly income level ( OR=3.871, 4.675), diabetes course ≥15 years ( OR=1.829), treatment measures ( OR=3.318, 4.512). Whether people had DR ( OR=1.605) were important factors that affected the awareness of DR prevention and treatment knowledge ( P<0.05). Conclusions:The overall awareness of DR prevention and treatment knowledge among diabetic patients in the community of Shenzhen is relatively low. Males, low education and income levels are the main influencing factors.

Objective To describe the MRI features and pathologic findings of biliary cystadenocarcinoma(BCAC)and to assess the diagnostic value of MRI in those tumors.Methods Five cases of BCAC were collected.All cases were proved by pathology.Non-enhanced and multiphase-enhanced MRI were performed in all cases.MRCP were performed in two cases.The MRI features of the five cases were reviewed retrospectively and correlated with pathologic findings.Results Histological evidence demonstrated five cases of BCAC.Four cases were solitary,whereas the other case was multifocal.All cases were solid and cystic lesions.Two cases were unilocular,whereas the other three cases were multilocular. Multiple mural nodules and irregular thickening cystic walls were presented in all cases.The cystic parts of the lesions were homogeneous in signal intensity and showed no enhancement after contrast administration in the five BCAC.Septa were present in three BCAC with multilocular cyst.On MRCP the bile duct dilatation was found in two BCAC.Conclusion MRI can reveal the characteristic findings of BCAC and accurate preoperative diagnosis can be made.

Coptis chinensis is widely used as Chinese medicine herbs and serious soil problems occur after continual cultivation of this medicinal plant. In the preset experiment, fibrous root extract of C. chinensis (REC) was added into soil to study the effect of REC on microbes and enzyme activity in soil. The results showed that both bacteria and actinomycetes decreased by about 2 times in contrast to fungi, which increased by about 3 folds. Phosphorus bacteria, potassium bacteria, azotobacter, ammonia bacteria, and nitrifying bacteria were also reduced significantly by REC, suggesting the inhibition of nitrogen biofixation and supply, mobilization of phosphorus and potassium, ad plant growth promotion as REC added into soil. There were multiple influences of REC on soil enzyme activities. Invertase activity was stimulated, while urease was inhibited and dehydrogenase unchanged by REC, indicating the interference of biochemical reactions in soil. In addition, type and total content of phosphorus lipid fatty acids (PLFAs) , the signature of microbes, decreased while the ratio of bacterium to fungus PLFAs increased as REC increased in soil, which suggested that fungi increased relatively with bacteria decreased thereby leading to easy occurrence of crop fungus diseases following cultivation of C. chinensis. The decrease in diversity and evenness indexes of microbial community in soil by REC indicated soil ecosystem deterioration and reduction of microbial groups and densities in soil. Therefore, allelopathic chemicals released from the roots of C. chinensis could change microbial community structure and resulted in serious soil problems by continual cropping of this medicinal plant.
Coptis ; Ecosystem ; Plant Extracts ; pharmacology ; Plant Roots ; Soil ; chemistry ; Soil Microbiology

To ensure the stability of chemistry components and the convenience of operation, ultrasound method was chosen to study in this investigation. As the total common peaks area in chromatograms was set to be evaluation index, the influence on the technology caused by extraction time, ethanol concentration and liquid-to-solid ratio was studied by using single factor methodology, and the extraction technology of Paeoniae Radix Alba was optimized by using response surface methodology. The results showed that the extracting results were most affected by ethanol concentration; liquid-to-solid ratio came the second and extraction time thirdly. The optimum ultrasonic-assisted extraction conditions were as follow: the ultrasonic extraction time was 20.06 min, the ethanol concentration in solvent was 72.04%, and the liquid-to-solid ratio was 53.38 mL · g(-1), the predicted value of total common peaks area was 2.1608 x 10(8). Under the extraction conditions after optimization, the total common peaks area was 2.1422 x 10(8), and the relative deviation between the measured and predicted value was 0.86%, so the optimized extraction technology for Paeoniae Radix Alba is suitable and feasible. Besides, for the purpose of extracting more sufficiently and completely, the optimized extraction technology had more advantages than the extraction method recorded in the monogragh of Paeoniae Radix Alba in Chinese Pharmacopoeia, which will come true the assessment and utilization comprehensively.
Paeonia ; chemistry ; Technology, Pharmaceutical ; methods