Objective To investigate the correlation about the quantitative test result of 13C-urea breath test(13C-UBT) with the quantity of Helicobacter pylori( H.pylori) and the degree of gastric mucosal inflammation.Methods 13 C-UBT was tested in the children with upper gastrointestinal symptoms.Ninety-five cases of the children with positive result (DOBδ‰ ≥4.0) underwent endoscopy and gastroscopic biopsy.The correlation was analyzed between the result of the 13 C-UBT and the severity of gastric H.pylori infection and gastric mucosal inflammation.Results There were significant differences about DOB values between the group with severe gastric H.pylori infection and the group with mild to moderate infection ( P ＜ 0.05 ),the same result was observed between the group with severe gastric mucosal inflammation and the group with mild to moderate inflammation( P ＜ 0.05 ).There was certain correlation between DOB value and the amount of gastric H.pylori colonization and mucosal inflammation.Conclusion The quantitative test result of 13C-UBT could indicate the number of gastric H.pylori colonization,but lack a precise quantitative relationship between them.There was positive correlation between the DOB values and the degree of gastric inflammation.

OBJECTIVE:To optimize the ultrasonic extraction technology of salidroside in Rhodiola rosea. METHODS:With the content of salidroside as the index,L16(45)orthogonal test was designed to observe the effects of 4 factors including the mass fraction of ethanol,solid-liquid ratio,extraction time and ultrasonic power on the content of salidroside in R. rosea extraction solu-tion. By using Matlab 6.5 software,mathematical simulation of ultrasonic extraction process of salidroside was made with the data of orthogonal test. Multiple regression analysis method was adopted to optimize the ultrasonic extraction technology of salidroside, and then the extraction result of optimal technology and that of traditional heating reflux technology were compared. RESULTS:The optimal extraction technology of salidroside was as follows as ethanol mass fraction of 77%,solid-liquid ratio of 1∶34 (g∶ml),extraction time of 34 min,ultrasonic power of 237 W(ultrasonic frequency of 40 kHz). Under the above-mentioned condi-tions,the content of salidroside was up to 0.982 4%,close to the predicted value of 0.989 4%. Compared to heating reflux meth-od,the ultrasonic method has similar content of salidroside but extraction time was shortened by 62.2%. CONCLUSIONS:The ul-trasonic extraction method for extracting the salidroside in R. rosea is simple,requires shorter time,and giving rise to higher extrac-tion rate.

Objective To discuss the values of three screening methods for the detection of early breast cancer,and to analyze the features of the screening cancer.Methods The first screening of breast cancer were performed in 5307 women who aged from 20 to 76 years with median age of 49 years.The three screening methods included physical examination with ultrasound and mammography,physical examination with mammography and mammography only.The rate of recall,biopsy,cancer detection of three methods were analyzed and the mammographic findings were reviewed Chi-square test or Fisher's exact test were used for the statistics.Results The recall rates were 4.90% (49/1001),6.90%(166/2407)and 4.48% (85/1899) in three methods respectively,the biopsy rates were 1.60% (16/1001),1.04% (25/2407) and 0.63%(12/1899),the cancer detection rates were 0.50% (5/1001),0.17% (4/2407) and 0 (0/1899).There were statistical differences among the three groups (X2=12.99,6.264,8.764,P < 0.05).Physical examination with ultrasound and mammnography had the highest cancer detection rate,ten breast cancers were detected and 8 were early stage breast cancer.Of seven cancers detected by mammography,only two were found by ultrasound.A cluster of calcifications were found in 2 cases,linear calcifications in 2 cases.One case presented as a asymmetric density,one as a asymmetric density with calcifications,one as multiple nodules with a duster of calcifications.Two breast cancers presented as asymmetric density were missed on mammography and diagnosed correctly after retrospective review.Conclusion Physical examination with ultrasound and mammography is the best method for breast cancer screening.The breast cancer can be detected by mammography earlier than other methods.