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Objective:To explore the teaching resources innovation and the teaching quality improvement for international students in clinical medicine based on the bilingual test question database of digitalized systematic anatomy.Methods:The test question database was set up and applied to Batch 2018 international students of clinical medicine (experiment group). The results of the usual test, final theory, and experimental examination of Batch 2017 international students (control group) were compared to verify the application value of the test question database. Questionnaires were used to get feedback from international students, and the feasibility of developing the test question database and the driving effect of teaching reform were further evaluated. SPSS 20.0 was used for data analysis, and the examination achievements of the two groups were compared with independent-samples t test and the measurement data were expressed by (mean ± standard deviation). Results:There was no significant difference between the two groups in the usual test results ( P>0.05), and in the experimental group, the results of final theory and experimental examination were significantly higher than those in the control group ( P<0.05). According to the questionnaire, more than 89.55%(155) of the international students highly appraised the test question database in terms of learning resources, quality of questions, examination mode and experience evaluation, while only 52.02%(90) of them recognized the bilingual form of the test questions. Conclusion:The bilingual test question database of digital systematic anatomy has effectively expanded the teaching resources and promoted the teaching reform of international students.
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Objective:To compare the diagnostic efficacy and ability of Thyroid Imaging Reporting Data System version (TI-RADS) of American College of Radiology (ACR) and artificial intelligence(AI) TI-RADS in diagnosis of thyroid nodules.Methods:A retrospective analysis was done on 266 patients(276 nodules) proved by ultrasound-guided fine-needle aspiration cytology (US-FNAC) in General Hospital of Eastern Theater Command from January to December 2019. The ROC curve of the two TI-RADS versions was drawn and the area under the curve (AUC) was calculated and compared.Results:AUCs of ACR TI-RADS and AI TI-RADS were 0.747 and 0.853. The sensitivity, specificity, positive predictive value and negative predictive value (96.62%, 62.50%, 74.87%, 94.12%) of AI TI-RADS were higher than ACR TI-RADS (95.27%, 44.53%, 66.51%, 89.06%). AI TI-RADS was able to avoid more unnecessary FNAC (71.74%) than ACR TI-RADS (67.03%).Conclusions:Both ACR TI-RADS and AI TI-RADS have good performances for differential diagnosis of thyroid nodules. AI TI-RADS is a more simple scoring system with better overall diagnostic performance and ability to exclude unnecessary FNAC with high negative predictive value than ACR TI-RADS.
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Objective To explore the effects of co‐cultured heat‐treated candida glabrata with rat tracheal epithelial (RTE) cells on the expression of Dectin‐1 and the production of IL‐6 and TNF‐α.Methods RTE cells in vitro were co‐cultured with heat‐treated candida glabrata bacteria liquid for 2 ,4 ,6 h ,while without co‐cultured RTE cells were used as control group .We observed the morphological changes of RTE cells ,detected the protein expressions of Dectin‐1 by Western blot ,used real‐time PCR to detecte the mRNA expressions of IL‐6 and TNF‐αand measured protein expression of IL‐6 and TNF‐αby ELISA .Results With the pass‐ing of time ,the RTE cells were damaged extensively and the expression of Dectin‐1 ,IL‐6 and TNF‐αbecame more and more signifi‐cant .Obviously ,there had significant difference in the expression of Dectin‐1 ,IL‐6 and TNF‐α between the co‐cultured 2 h group and the control group ,the co‐cultured 4 h group and the co‐cultured 2 h group ,the co‐cultured 6 h group and the co‐cultured 4 h group (P<0 .05) .Conclusion RTE cells have natural immune function .The Dectin‐1 involves in the recognition of heat‐treated Candida glabrata ,activating secretion of IL‐6 and TNF‐αand mediating inflammatory reaction .IL‐6 plays a negative regulation role .
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Objective To study status and risk factors of nosocomial infection of Pseudomonas aeruginosa in hospital ,provided a basis to clinical control infected of PDRPA .Methods Monitoring of nosocomial infection of Pseudomonas aeruginosa from Februar‐y 2014 to March 2012 in our hospital ,retrospective analysis of the clinical data of the corresponding cases ,analysis of the risk fac‐tors for PDRPA infection .Results PDRPA was mainly distributed in the severe medicine department and department of Neurosur‐gery ,given priority to with sputum ,59 .5% and 31 .0% were the source of the pan resistant strains ,respectively ;Age ,duration of hospitalization ,use of antimicrobial drugs ,the use of carbapenems ,the use of cephalosporins ,quinolones ,diabetes ,coronary heart disease ,deep vein intubation ,endotracheal intubation ,ventilator ,nasogastric tube and PDRPA infection significantly correlated(P0 .05) .Conclusion Age ,duration of hospitalization ,use of antibacterial drugs ,the use of carbapenems ,the use of cephalosporins ,quinolones ,diabetes , coronary heart disease ,deep vein intubation ,endotracheal intubation ,ventilator ,nasogastric tube is a risk factor for PDRPA infec‐tion ,Control of diabetes ,coronary heart disease ,rational use of antimicrobial agents ,reduce the invasive operation is the key to pre‐vent and control nosocomial infection in PDRPA .
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Objective To access the effectiveness of withdrawing iodized salt on correcting the iodine excess in the population living in high iodine areas.Methods Before withdrawing iodized salt,2 twons were selected from each of 5 cities with water-borne iodine excess areas in Hebei province.All the selected towns were divided into 7 groups according to their iodine content in drinking water.Two villages wereselected from each group where urine samples of children aged 8 to 10 years old were collected to investigate the change of urinary iodine content of these children before and after withdrawing iodized salt.The urinary iodine content was determined using the method for determination of ammonium persulfate digestion arsenic cerium catalytic spectrophotometry (WS/T 107-2006).Correlation between children's urinary iodine and drinking water iodine was analyzed.Results Before and after withdrawing iodized salt,744 and 771 urine samples were collected from the examined children aged 8-10 years respectively.The overall median urinary iodine content (MUIC) of the examined children after withdrawing iodized salt (350.1 μg/L) decreased significantly than that of before withdrawing iodized salt (460.8 μg/L,U =3 127.8,P ＜ 0.05).After withdrawing iodized salt,the MUIC of the children decreased significantly in 8 of 12 villages (P ＜ 0.05).Before and after withdrawing iodized salt,the percentage of urine samples with iodine content above 300 μg/L was 76.7％ (571/744),58.5％ (451/771) respectively,with significant statistical difference (x2 =57.7,P ＜ 0.05).After withdrawing iodized salt,Children's MUIC also decreased significantly across gender and age (boys:558.5,351.6 μg/L,U =960,P ＜ 0.05; girls:522.9,355.5 μg/L,U =698,P ＜ 0.05; 8 years old:536.0,295.5 μg/L,U =529.5,P ＜ 0.01; 9 years old:386.2,323.2 μg/L,U =753.5,P ＜ 0.01; 10 years old:525.5,368.8 μg/L,U =521.5,P ＜ 0.05).The children's MUIC correlated positively with the median water iodine contert (MWIC) in the villages where they lived (r =0.951,P ＜ 0.01).Analyzed by linear regression,approximately 89％ of the variability in MUIC was associated with variability in MWIC.Conclusions Withdrawing iodized salt could only correct the iodine excess caused by consuming iodized salt in the population living in the areas with MWIC below 100 μg/L.In the areas with water iodine above 100 μg/L,intervention should be focused on seeking water with proper iodine content.
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Objective To understand the iodine nutritional status of urban and rural pregnant women in Shijiazhuang.Methods Urban pregnant women were selected from 8 neighborhood committees of Chang' an District,Shijiazhuang,while the rural pregnant women were selected from 72 villages of 18 counties in Shijiazhuang.These research subjects were grouped into women with early pregnancy at 1-12 weeks,mid pregnancy at 13-28 weeks and third trimester at 32-40 weeks.Urine samples of the subjects were collected.Arsenic-cerium catalytic spectrophotometry (WS/T 107-2006) was used to determine urinary iodine concentrations (UIC).Results Seven hundred thirty-seven urban pregnant women and 898 cases from the rural areas,totally 1 635 subjects were included into the survey.The median UIC of urban subjects,rural cases,and all pregnant women in Shijiazhuang was 169.0,145.9 and 156.7 μg/L,respectively.The median UIC of the rural pregnant women was significantly lower than that of their urban peers (x2 =54.569,P ＜ 0.05).Urban pregnant women with UIC less than 150 μg/L accounted for 40.30％ (297/737) of the total cases,and rural pregnant women 51.89％ (466/898).The difference was statistically significant between these subjects (x2 =21.864,P ＜ 0.05).The median UIC of pregnant women at third trimester of the urban and the rural areas was 113.5 and 145.6 μg/L,respectively.Though their UICs were not up to the national criteria (150 μg/L),the difference was statistically significant between the urban and the rural subjects (x2 =8.365,P ＜ 0.05).UIC less than 150 μg/L of the urban and the rural pregnant women [60.19％ (65/108) vs 51.96％ (93/179)]at third trimester was not significantly different (x2 =1.844,P ＞ 0.05).Conclusions Iodine deficiency is present in pregnant women in Shijiazhuang City.Iodine deficiency among rural pregnant is more severe than that of peers of urban.The iodine deficiency is more severe in the pregnant population at late pregnancy.Besides iodized salt,food with rich iodine should be supplemented for the pregnant,especially those at the third trimester.It is important to monitor iodine nutritional status dynamically during the pregnancy to keep a proper UIC for the pregnant.
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The research aimed to investigate the therapeutic effects and mechanisms of Opuntia dillenii Haw polysaccharide (OPS) on atherosclerosis of rats. First atherosclerotic rat models were established by high-fat and high-calcium diet. Thirty days later, the rats were treated with low dosage of OPS (0.2 g x kg(-1) x d(-1)) or high dosage of OPS (0.4 g x kg(-1) x d(-1)) by intraperitoneal injection for 60 days continuously. At the end of treatment, thoracic aorta rings were prepared and vasorelaxation of rat thoracic aorta in different experiment groups were determined by using 620M multi wire myograph system in vitro. Blood and livers of rats were collected. Then plasma levels of total cholesterol (TC), triglyceride (TG) and low density lipoprotein (LDL) of rats were separately determined using whole automatic biochemical analyzer; protein level of hepatic apolipoprotein B (ApoB) and that of hepatic diglyceride acyltransferase (Dgat1) were measured by Western Blot technique. Results showed that the ability of rat thoracic aorta to relax decreased markedly in the model group compared with that in the normal group, and significant differences existed in vasorelaxation ratios induced by different concentrations of carbamylcholine chloride (Carb) between these two groups (P < 0.01). After OPS treatment, the ability of rat thoracic aorta to relax improved markedly, the vasorelaxation ratios induced by Carb at 5 and 10 μmol x L(-1) were respectively 0.34 ± 0.08 and 0.62 ± 0.15 in the group treated with low dosage of OPS, while the ratios induced by Carb at 1 and 5 μmol x L(-1) were respectively 0.54 ± 0.08 and 0.98 ± 0.02 in the group treated with high dosage of OPS, which were all significantly different with those in the model group (P < 0.01). Plasma contents of TC, TG and LDL reduced significantly by the treatments both with low and high dosages of OPS compared with those in the model group (P < 0.01). Protein level of hepatic ApoB and that of hepatic Dgat1 decreased significantly after the treatment with high dosage of OPS compared with those in the model group (P < 0.01). These results indicate that OPS can markedly improve the vasorelaxation of thoracic aorta of atherosclerotic rats and has significant anti-atherosclerotic effect; inhibiting the expression of ApoB and Dgat1 and thus decreasing the amounts of TC, LDL and TG serving as one of the molecular mechanisms of its antiatherosclerosis effect.
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<p><b>OBJECTIVE</b>Using the thyroid volume criteria for body surface area (BSA) to assess more precisely the effectiveness of removing iodized salt on the goiter status of children living in areas with excessive iodine in drinking water.</p><p><b>METHODS</b>Three towns with median water iodine (MWI) of 150-300 µg/L were selected by simple random method in Hengshui city of Hebei province of China in May of 2010. A total of 452 and 459 children in the 3 towns were randomly selected to measure thyroid volume by ultrasound. Iodized salt was removed in July of 2010. In October of 2013, 459 children in these 3 towns were selected by simple random method to measure their thyroid volume by ultrasound again. Their goiter status was judged using the criteria of thyroid volume for BSA recommended by the WHO.</p><p><b>RESULTS</b>After removing iodized salt, the overall BSA specific goiter prevalence in the three towns significantly decreased from 33% (149/452) to 6% (30/459) (χ² = 100.64, P < 0.001). The BSA specific goiter prevalence in 8, 9 and 10 year-old children decreased respectively from 38% (35/92), 31% (59/193) and 33% (55/167) to 6% (10/164), 7% (11/163) and 7% (9/132) (χ² values were 41.35, 31.66, 29.79, P < 0.001). The BSA specific goiter prevalence in boys and girls decreased from 34% (83/244) and 32% (66/208) to 6% (14/225) and 7% (16/234) (χ² values were 55.01, 45.06, P < 0.001) respectively.</p><p><b>CONCLUSION</b>The BSA specific children's goiter prevalence decreased significantly after removing iodized salt from their diet in the HIA in Hebei province.</p>
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Child , Female , Humans , Male , Body Surface Area , China , Diet , Drinking Water , Goiter , Iodine , Prevalence , Sodium Chloride, Dietary , WaterABSTRACT
Aim To investigate the NIH3T3/STAT3CA cell proliferation ability and the STAT3 transcriptional activity affected by PTPMeg2 . Methods MTT assay and xenograft nude mice model were used to investigate the NIH3 T3/STAT3 CA cell proliferation inhibited by PTPMeg2 in vitro and in vivo. Co-immunoprecipitation assay was used to measure the interaction between PT-PMeg2 and STAT3CA. STAT3 transcriptional activity was measured by dual-luciferase assay. Results The NIH3 T3/STAT3 CA cell proliferation ability was signifi-cantly inhibited by PTPMeg2 in vitro and in vivo com-pared with the control group ( P <0.05 ) . The tran-scriptional activity was increased by PTPMeg2 , but not the PTPMeg2 mutant (PTPMeg2C515S) and the ShPT-PMeg2 . Conclusion PTPMeg2 plays a role in inhibi-ting the proliferation ability of NIH3 T3/STAT3 CA cells through inhibiting the STAT3 transcriptional activity.
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Objective To evaluate the application value of non-invasive hemodynamic monitoring by thoracic electrical bioimpedance (TEB) in elderly non-cardiac surgery patients after general anaesthesia.Methods Fifty-six elderly non-cardiac surgery patients after general anaesthesia were divided into control group and TEB group with 28 patients in each group by random digits table. All patients received standardized care including central venous pressure (VAP). Besides these monitoring, hemodynamic monitoring by TEB was used to evaluate the hemodynamic state of patients in TEB group. Diuretics, inotropic agents, vasoactive drugs or intravenous fluid therapy were used according to monitoring guidance. The heart rate (HR), mean arterial pressure (MAP), VAP, urine output (UO) were recorded in different time. The length of mechanical ventilation and ICU stay were also recorded. The difference in HR, MAP, VAP, UO, the length of mechanical ventilation and ICU stay between two groups were analyzed. Results The differences between two groups had no significance in HR, MAP, VAP, UO at the same time (P ＞ 0.05 ). The length of mechanical ventilation of TEB group [ (19.5±15.9)h] was shorter as compared to that of control group [ (25.5 ± 16.5) h ], but the difference was not significant (P =0.173). The ICU stay of TEB group [(2.8 ± 1.0) d ] was shorter as compared to that of control group[(3.6±1.6)d] and the difference was significant (P=0.032). Conclusion Non-invasive hemodynamic monitoring by TEB can monitor the changes of hemodynamics and direct treatment in elderly non-cardiac surgery patients after general anaesthesia.
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Objective To explore the relationship between lecithin cholesterol acy ltransferase (LCAT) gene 608C/T and 511C/T polymorphisms and stroke in Chinese Han population in Hunan province. Methods One hundred fifty patients with cerebral infarction, 150patients with cerebral hemorrhage, and 122 age- and sex-matched healthy controls were selected.LCAT gene 608C/T and 511C/T polymorphisms were detected by using polyrnerase chain reaction, single strand conformation polymorphism, and restriction fragment length polymorphisms. Results The CT genotype frequency (14. 0% ) and T allele frequency (7. 0% )of the LCAT gene 608C/T in the cerebral infarction group were significantly higher than those in the control group (all P ＜0. 05), while there were no significant differences in the CT genotype frequency (7. 3% ) and T allele frequency (3.7%) between the cerebral hemorrhage group and the control group (P ＞ 0. 05). The CT genotype frequency (10. 0% ) and T allele frequency (5. 0% ) of the LCAT gene 511C/T in the cerebral infarction group were significantly higher than those in the control group (all P ＜0. 01), while there were no significant differences in the CT genotype frequency (3.3%) and T allele frequency (1.7%) between the cerebral hemorrhage group and the control group (P ＞0. 05). Conclusions The 608C/T and 511C/T polymorphisms may be associated with the occurrence of atherosclerotic cerebral infarction in Chinese Han population in Hunan province. They may be the predisposing factors for atherosclerotic cerebral infarction in this population; however, they are not associated with cerebral hemorrhage.
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Objective To assess the value of CT, PET, PET/CT in diagnosis of peritoneal metastases with Meta analysis. Methods Articles of CT, PET or PET/CT on peritoneal metastases published in English or Chinese from Jan 2000 to May 2008 were collected, and histopathological and (or) surgical findings were taken as golden standards. The sensitivity, specificity, summary receiver operating characteristic (SROC) curves, area under the curve (AUC) and the heterogeneity were calculated with software of SAS 8.0, Meta-DiSc 1.4 and STATA 10.0. Results The results of Meta analysis from 11selected articals showed that PET had the highest pooled specificity [0.96, (0.91-0.98)];PET/CT had highest pooled sensitivity [0.77, (0.67-0.85)]. The AUC and Q~* of PET, PET/CT and CT was (0.92, 0.85), (0.99, 0.96), (0.91, 0.84), respectively. AUC of PET/CT was higher than that of CT (Z=2.33, P<0.05). Conclusion PET/CT is a high accuracy diagnostic tool for detecting peritoneal metastases.
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OBJECTIVE To investigate the pathogen distribution and antimicrobial resistance in ventilator-associated pneumonia(VAP) in intensive care unit(ICU) of our hospital and provide reference for clinical treatment.METHODS Among 135 patients with VAP in ICU of our hospital,pathogens distribution and resistance rate from sputum culture were analyzed retrospectively.RESULTS Among 188 strains of isolated pathogens in 135 patients,the Gram-negative bacteria accounted for 74.5%,the Gram-positive bacteria 14.4% and the fungi were 11.2%.The predominant pathogens were Pseudomonas aeruginosa(19.7%),Stenotrophomonas maltophilia(18.6%),Klebsiella pneumoniae(16.0%),and Acinetobacter baumannii(14.4%),Staphylococcus aureus(10.6%),Candida albicans(9.6%).The percentage of meticillin-resistant S.aureus(MRSA) was 95.0% and no vancomycin-resistant S.aureus isolate was detected out.Sensitive antibiotics were cefoperazone/sulbactam,imipenem/cilastatin,fluconazole etc.CONCLUSIONS The multi-drug resistant Gram-negative bacilli are the main pathogens in VAP in ICU of our hospital.Cefoperazone/sulbactam and imipenem/cilastatin can be used as first empirical antibiotics for patients with VAP in ICU of our hospital.
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This study examined the effects of flow shear stress on the bio-capacity of the endothelial cells' induced from mesenchymal stem cells (MSCs). After cultivating the SD rat mesenchymal stem cells in vitro, we exposed them under different intensity of flow shear stress and induced these cells to endothelial cells. The variations of total anti-oxidation competence (T-AOC) and quantity of nitrogen monoxide (NO) were tested. The results showed that shear stress has an enhanced effect on the T-AOC and NO of endothelial cells induced from MSCs in an intensity-dependent manner. Flow shear stress could provide a protective action on the in vitro induction of endothelial cells, thus formulating a theoretical foundation for the therapeutics of ischemic heart diseases and vascular tissue engineering.
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Animals , Female , Male , Rats , Antioxidants , Metabolism , Bone Marrow Cells , Cell Biology , Physiology , Cell Differentiation , Physiology , Cells, Cultured , Endothelial Cells , Cell Biology , Metabolism , Mesenchymal Stem Cells , Cell Biology , Physiology , Oxidation-Reduction , Rats, Sprague-Dawley , Stress, MechanicalABSTRACT
A system for the Agrobacterium rhizogenes-mediated transformation and plant regeneration of A. venetum has been developed. The highest transformation frequency was 100%, achieved by using strain LBA9402 with root explants. The highest density of hairy roots reached 22 when root explants transformed by R1000 cultured in the dark. Adventitious shoots were obtained from profusely branched, fast-growing (type PBF) hairy roots, and the adventitious shoot induction frequency was 20%. Regenerated shoots rooted easily on hormone-free 1/2 MS solid medium in 2 weeks. Approximately 1/3 regenerated plants derived from hairy roots exhibited prolific roots with shortened internodes. Whereas other regenerated plants showed another phenotype: long intemodes, strong stems, and fleshy blades. However, all regenerated plants displayed a relatively fast development procedure and stronger than the aseptic seedlings. Polymerase chain reaction (PCR) analyses confirmed the hairy root lines and regenerated plants were induced by A. rhizogenes.
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Apocynum , Genetics , Plant Roots , Regeneration , Rhizobium , Genetics , Tissue Culture Techniques , Transformation, GeneticABSTRACT
Objective To Investigate the effect of Interleukin-15 on guinea pigs cholecystitis formation.MethodsCholecystitis models on guinea pigs were established.Then the content of IL-15 in the serum and bile was measured with ELISA method.ResultsThe content of IL-15 in the serum and bile significantly was elevated,and a remarkable difference was existed between the experimental group and blank control group.In addition,in the cholecystitis models group,IL-15 content in the serum and in gallbladder bile showed significantly positive correlation.ConclusionIL-15 participates in the formation of cholecystitis.
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OBJECTIVE To investigate the distribution and resistance characteristic of Escherichia coli in order to provide reference for the clinical application of drugs.METHODS The strains of E.coli were detected and their sensitivity to antibiotics was determined by VITEK automatic bacterium identifying and drug sensitivity analyzing systems,then the specimens in which E.coli was detected and the result of sensitivity to antibiotics were analyzed.RESULTS Among 210 specimens in which E.coli was detected,the urine was the most frequent.There were 46 strains which produced extended-spectrum ?-lactamases(ESBLs),the ESBLs-producing rate of E.coli was 21.9%,the drug resistance of ESBLs producers was more serious than that of nonproducers.The resistant rate of ESBLs producers against penicillins was 100%,but the susceptibility rate was 19.6-84.8% while combined with the ?-lactamases inhibitors.The susceptibility rates of ESBLs producers to the antibiotics from the first generation cephalosporins to the third generation ones were 0.0-45.6%.The susceptibility rates of ESBLs producers to cefepime,cefoxitin,ciprofloxacin and Cotrimoxazole were 60.9%,34.8%,10.9% and 13.0%,respectively,whereas amikacin,imipenem,and meropenem were more effective against the bacteria,the susceptibility rates of ESBLs producers were 89.1%,97.8% and 97.8%,respectively.while all the nonproducers were susceptible to them.The ESBLs producers had high sensitivity to imipenem,meropenem,amikacin and piperacillin/tazobactam,and had high resistance to the other antimicrobial drugs,they showed multi-drug resistance.CONCLUSIONS It is rather serious the resistance of E.coli to usual antibiotics,and that of ESBLs producers is more serious.It should be cautious to use cephalosporins to treat infections caused by E.coli,carbapenem,amikacin and some of complex antibiotics containing ?-lactamases inhibitor are very effective to treat infections caused by ESBLs producers.It is very important to select rational drugs correctly for clinical treatment of the infections according to the results of antibiotics susceptibility tests.
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Objective To investigate the action and the mechanism of Jinyin granule(JYG) on cholecystitis in guinea pigs.Methods Cholecystitis models of Guinea pigs were established and then randomly divided into six groups: normal group,model group,XiaoYanLiDan tablet(XYLDT) group,treatment groups including low,middle and high dosage groups of JYG.The Pigs were given above drugs respectively while in normal and model groups the same volume of normal saline was given.Body weight,gallbladder weight,bile amount,IL-1? in the serum were measured and gallbladder pathological tissue was observed by light microscopy.Results Comparing with the model group,the treatment groups had higher body weight,lower gallbladder weight,less bile amount,obviously slighter inflammation and less amount of IL-1? in the serum.Conclusion JYG possesses the therapeutic action to cholecystitis on guinea pigs and its mechanism is interrelated to the decreasing of IL-1? in the serum.
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OBJECTIVE: To establish a method for the determination of the content of thiomersal in hepatitis B vaccine. METHODS: The content of thiomersal in hepatitis B vaccine was determined by flow injection-hydride generation atomic absorption spectrometry. The samples were treated by reflux digestion method with 4% sulphuric acid as medium,0.5% potassium borohydride as reducing agent,and 0.5% sulphuric acid as supporting liquid. RESULTS: The linear range of thiomersal was 5.0～100 ?g?L-1,with an average recovery rate of 100.6%(RSD=0.89%) and the lowest detection limit of 1.00 ?g?L-1. CONCLUSION: The method is simple,rapid and sensitive,and suitable for the determination of the content of thiomersal in hepatitis B vaccine.
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OBJECTIVE To investigate the characteristic of clinical distribution and drug resistance of pathogenic bacteria in lower respiratory tract infection. METHODS Bacterial culture of the lower respiratory tract samples collected from patients who were admitted from Jan to May 2008 was done.The bacteria identification and drug sensitivity tests were done by VITEK bacterium identifying and drug sensitivity analyzing system. RESULTS A total of 502 pathogens were isolated,in which 340 strains of Gram-negative bacteria(67.7%),32 strains of Gram-positive cocci(6.4%)and 130 strains of fungi(25.9%).Of all the 372 strains of bacteria,the most common pathogens in turn were Acinetobacter baumannii,Pseudomonas aeruginosa,Klebsiella pneumoniae and Escherichia coli,respectively.Non-fermenters were the dominant pathogens in intensive care unit(ICU)and the surgery wards,Enterobacteriaceae and fungi were the dominant pathogens in the non-operation wards.Of A.baumannii strains,the antibiotic resistant rates to imipenem and meropenem were 7.5% and 8.8%,respectively,the resistant rates to the other antibiotics were high(53.8%-100.0%,respectively).Of P.aeruginosa strains,the antibiotic resistant rates to imipenem,meropenem,polymyxicn E,ciprofloxacin,amikacin,tobramycin and gentamicin were 11.1%-27.0%,respectively,The resistant rates to the other antibiotics such as penicillins,cephalosporins and the complex antibiotics containing ?-lactamases inhibitor were 38.1%-100.0%.The ESBLs-producing rate of K.pneumoniae strains(71.7%)was higher than that of E.coli strains(29.1%).K.pneumoniae strains and E.coli strains were all sensitive to imipenem and meropenem,and both of their resistant rates against amikacin were the same(10.9%),but against the other antibiotics the resistance of E.coli strains were more serious than that of K.pneumoniae strains. CONCLUSIONS In our area,non-fermenters are mainly isolated from ICU and the surgery wards.Enterobacteriaceae and fungi are mainly isolated from the non-operation wards.The major pathogens show multi-drug resistance except imipenem,meropenem and amikacin.It′s important to prevent hospital acquired lower respiratory tract infection during the clinical therapy,and it is urgent for rational use of antimicrobial agents according to the results of antibiotics susceptibility tests.