Objective:To investigate the influences of different centrifugal conditions on the ultrastructure of cultured cells in the digestion centrifugation to find out the best speed and time of centrifugation.Methods:The cultured cells after digested,were divided into groups according to different digestion centrifuge speed and time,and the changes of cell morphology in each group at different centrifugation time and speed were compared under transmission electron microscope.Results:Enough cells could mot be collected with the centrifuge speed less than 800 r/min,8 min.The cells were deformed due to extrusion or the cytoplasm was torn with the speed of 2 000 r/min,15 min.With the speed of 800～1 500 r/min,8～15 min,it was more proper to prepare samples and preserve cell ultrastructure.Conclusion:It is ideal to prepare TEM samples of cultured cells by using the cells being digested and centrifuged with speed at 800 ~1 500 r/min and time of 8~15 minutes.

Objective To investigate the teaching effect of applying idea of ‘ integrating world with specialty' in teaching ward - round.Methods Totally 112 undergraduates from department of anesthesiology in Chongqing medical university were randomly divided into 2 groups:group C and group T.The students in group C and group T were received traditional method and teaching ward-round applying idea of ‘integrating world with specialty' respectively.The teching effects were compared.Results Constituent ratio of performance of written test and defence of case analysis in group C and group T were respectively as follow,excellent ( 12％,19％) vs.(31％,37％),good (25％,19％ ) vs.(50％,44％ ),middle (54％,50％ ) vs.( 19％,13％ ),bad (9％,12％ ) vs.(0,6％ ),and there were statistically differences between the two groups.Conclusion Teaching ward-round applying idea of ‘ integrating world with specialty' integrates medical knowledge with social skills and common sense of life,making it easier for medical students to understand and master professional knowledge,as a result of improving the students' ability of problem analysing and solving.

Objective To investigate the toxic effect of cadmium (Cd) on the ultrastructure ,expression of related protein and the signal molecule phosphrylated P38 mitogen-actived protein kinase(P-P38MAPK) of primary cultured rat sertoli cell(Sc) ,and the protective effect of astragaloside (A ) on it .Methods The primary cultured rat Sc were divided into the control group ,Cd (50 mol/L)group and Cd(50 mol/L) plus A(10 mg/L) group ,they were used for the electron microscope observation and the im-munohistochemistry detection of vimentin ,E-cadherin ,-catenin and P-P38MAPK .Results The Sc ultrastructural changes included that the swelled mitochondria ,abundant lipid droplets and dilated endoplasmic reticulum were found in the Cd group .Further ,apop-tosis occurred in some Sc .However these ultrastructure changes above mentioned were slighter in the Cd plus A group ;the immu-nohistochemistry showed that the positive products of vimentin ,E-cadherin and-catenin were obviously decreased in the Cd group (P<0 .05) ,and those in the Cd plus A group were higher compared with the Cd group(P<0 .05);the expression of P-P38MAPK in cytoplasm was increased in the Cd group ,and showed the trend to move from cytoplasm to nucleus ,meanwhile ,the positive prod-ucts expression in the Cd plus A group was lower than that in the Cd group (P<0 .05) .Conclusion Cadmium can cause the injury of the Sc ultrastructure ,damage of cytoskeletal protein and fibronectin ,and increase of P-P38MAPK level ;astragaloside can antago-nize the toxicity of cadmium on Sc ,the protective effect maybe related with the decrease of P-P38MAPK in Sc .

Objective To investigate epidemiological characteristics of animal plague in Microtus brandti plague foci in China from 2005-2013,and to found the reason for cross epidemic of Microtus brandti and Mongolian gerbil plague.Methods Totally 135 Yesinia pestis (Y.pestis) were isolated in Microtus brandti plague foci from 2005 to 2013.According to the typing method of Y.pestis and The Criteria of Plague Natural Foci and Animal Plague Epidemic(GB 16883-1997),bacteria type was identified using biochemical tests and sugar alcohols glycolysis test.Monitoring reports of the plague epidemic situation in Abag Banner,Xilinhot,Sonid left Banner,Xi Ujimqin Banner,Dong Ujimqin Banner,Inner Mongolia were collected.The epidemiological distribution of animal plague in Microtus brandti plague foci was analyzed.Results In 135 strains tested which were isolated from 2005-2007 and 2010,128 strains were fermented farinose,unfermented rhamnose; and 7 strains were fermented rhamnose,unfermented arabinose in 2008.According to the types of Microtus brandti Y.pestis (fermented rhamnose,unfermented arainose) and Mongolian gerbil Y.pestis (fermented arainose,unfermented rhamnose),Microtus brandti plague was identified in the epidemic in Xilinhot and Dong Ujimqin Banner in 2008.The Mongolian gerbil plague was epidemic in Abag Banner,Xilinhot and Xi Ujimqin Banner in2005-2007 and 2010.Conclusions In 2005,Mongolian gerbil type of Y.pestis is first isolated in Abag Banner,Xilinhot and Xi Ujimqin Banner.It is confirmed a newly discovered Mongolian gerbil plague foci.Abag Banner,Xilinhot,Sonid left Banner,Xi Ujimqin Banner and Dong Ujimqin Banner are Microtus brandti plague foci,only Dong Ujimqin Banner is Microtus brandti plague foci,others are two types of Microtus brandti and Mongolian gerbil plague foci.Since 2005,new epidemic situation is found,the Microtus brandti plague foci is becoming complex.It is a serious threat to human being.We must further strengthen the research and prevention in future.

Objective To analyze and evaluate the application of indirect hemagglutination test (IHA) method in the epidemic area of Meriones unguiculatus in Inner Mongolia.Methods The plague monitoring summary and epidemic analysis reports of each year in Inner Mongolia from 1996 to 2016 were collected.The serum results of the IHA method were analyzed,including the time,region and the distribution of host animals.Results From 1996 to 2016,a total of 38 096 serum samples were detected from various host animals,and 172 positive samples were detected,with a positive rate of 0.45％.In the 21 years,except 2001 and 2015,the occurrence and prevalence of plague were judged by the IHA method for the remaining 19 years.There were 10 counties detected positive sera by IHA method;the positive results were detected by IHA method in 6 kinds of host animals,including 5 rodents and 1 carnivorous,and the positive rate of Rhombomys opimus was up to 6.17％ (91/1 475),the highest titer of the seropositive host animals was as high as 1:10 240.Conclusions The IHA method is easy to operate and economical.It plays a huge role in the timely detection of the epidemic in systematic monitoring of the Meriones unguiculatus in Inner Mongolia.

Medical specimen photography is an indispensable step in medical education and scientific research.On the basis of a large number of shooting practices,a set of photography skills have been summed up,including the medical specimens shooting principles,sampling methods,camera equipments,backgrounds,light source and parameters.During medical specimen photography,we should make sure true process,accurate samples,clear image quality,layered main backgrounds,beautiful pictures and correct selection and usage of photographic equipments.Accordingly,a set of disposable small photo studios which are suitable for medical specimen shooting have been built to help medical workers improve the quality of photography in medical education and research specimens.

Objective To understand the epidemiological characteristics of recent brucellosis in Hohhot.Methods Clinical data of patients with brucellosis in Hohhot City were retrospectively analyzed,and the patients were diagnosed in the outpatient clinic of Comprehensive Center for Disease Prevention and Control of Inner Mongolia Autonomous Region from 2014 to 2017.To analyze the patient's area,age,gender,occupation and time distribution of the disease.Results A total of 1 940 patients with brucellosis were diagnosed in Hohhot from 2014 to 2017,with an average age of 50.8 years old.There were 1 464 males with an average age of 50.4 years old and 476 females with an average age of 51.9 years old;the male-female ratio was 3:1.The number of cases of brucellosis in 2014-2017 was 612,649,402,and 277,respectively.Brucellosis was mainly distributed in three districts including Horinger County (937 cases),Tumd Left Banner (236 cases) and Tuoketuo County (191 cases),accounting for 70.31％ (1 364/1 940) of the total number of cases in the city.The age of onset was at least 1 year old,the oldest age was 86 years old,and most cases were in the 45-＜ 65 age group,the total number of cases was 1 046,accounting for 53.92％ (1 046/1 940) of the total number of cases in the city;the occupational distribution was mainly farmers (1 795 cases),herders (13 cases) and veterinarians (17 cases),with a total of 1 825 cases,accounting for 94.07％ (1 825/1 940).The time distribution was mainly concentrated in March-July,and the number of cases was 1 157 cases.Conclusions The number of brucellosis cases in Hohhot area of Inner Mongolia is mainly from Horinger County,Tumd Left Banner and Tuoketuo County;the cases occur frequently in Spring and Summer;the age of onset is mainly between 45-＜ 65 years old,they are mainly male farmers.