BACKGROUND: Chinese character is the only non-alphabetic system of writing, the patterns of semantic symbol, phonetic symbol and sign in the cognition of Chinese characters, it is the combination of form, sound and meaning, and its cognitive pattern, pathway, analytical judgement of semantic and storage are different from those of western alphabetic system of writing, and the processing of Chinese characters maydifferent from that of alphabetic system of writing.OBJECTIVE: To localize the motor language center of the healthy volunteers whose native language is Chinese by means of the equivalent current dipole (ECD) and synthetic aperture magnetometry (SAM) of magnetoen cephalography (MEG).DESIGN: A single-sample univariate analysis.SETTING: Department of Neurology, Beijing Tiantan Hospital affiliated to Capital University of Medical Sciences.PARTICIPANTS: Ten healthy volunteers whose native language is Chinese were selected from the postgraduates and training participants in the Department of Neurology, Beijing Tiantan Hospital affiliated to Capital University of Medical Sciences between July 2003 and April 2005, they were all right handedness and had no speech disorders and cognitive impairments, and all accepted training of language task.METHODS: All the healthy subjects were given the language task stimulation of reading words and pseudowords silently, the number of the silently read nouns, appearing time for each noun and the interval between two tasks were strictly matched, ① Words were the common high-frequency characters, accorded to the law of Chinese characters components, and had 4-13 strokes. ② Pseudowords, composed by Chinese characters made-up software, accorded to the made-up law of Chinese character, but could not compose the stroke assemble of the character, and had 4-13 strokes. The evoked magnetic field produced after the stimulation was recorded with MEG, the collected data were overlapped with MRI to obtain the localization of language functional areas.RESULTS: All the 10 volunteers finished the test and entered the analysis of results. Both words and pseudowords evoked obvious late magnetic reaction waves in bilateral cerebral hemispheres, the motor language centers both located at posterior inferior frontal gyrus.CONCLUSION: The motor and classic motor language centers are general concordant in the normal people whose native language is Chinese, that was to say, the motor language center localizes at posterior inferior frontal gyrus of normal people whose native language is Chinese.

Cisplatin has good effects in the treatment of a variety of solid cancers.Studies have shown that cisplatin can make great contributions in treatment of nasopharyngeal carcinoma through DNA,telomeres,cell cycle,apoptosis,apoptotic volume decrease,cell senescence,NK cells and other channels.

Objective To explore the effict of Jiegu-Qili tablet combined with intramedullary interlocking nails in the treatment of the fracture of tibia and fibula. Methods A total of 80 patients with fracture of tibia and fibula were selected, and were divided into two groups according to odd and even number of hospitalization. The surgery group (39 patients) was given intramedullary interlocking nails, the surgery and drug group (41 patients) was given Jiegu-Qili tablet combined with intramedullary interlocking nails. The perioperative parameters, the rate of fracture healing, knee scores and complications were evaluated during 12 months. Results The hospitalization (14.43 ± 2.47 d vs. 21.63 ± 3.16 d, t=11.385, P<0.01) and fracture healing time (5.22 ± 1.05 m vs. 9.75 ± 0.97 m, t=20.016, P<0.05) of the surgery and drug group was shorter than that of the surgery group. The fracture healing rate of surgery and drug group (92.7%vs. 76.9%,χ2=3.894, P<0.05) was higher than that of the surgery group. After 6 months surgery, the pain, activity, stability and KSS scores (21.60 ± 1.60 vs. 19.50 ± 1.90, 22.7 ± 2.8 vs.18.70 ± 2.40, 23.50 ± 2.40 vs. 19.40 ± 1.80, 89.20 ± 9.30 vs. 78.00 ± 8.30) of the surgery and drug group were higher than that of the surgery group (P<0.05). There was no statistical significance on walking ability between two groups (21.40 ± 2.50 vs. 20.40 ± 2.20, P>0.05). During 12 months follow-up, there were no statistical significance on complications between two group (7.3%vs.15.4%,χ2=1.303, P>0.05). Conclusions In summary, the Jiegu-Qili tablet combined with intramedullary interlocking nails had a good therapeutic effect on the fracture of tibia and fibula. It could increase the speed of fracture healing, shorten the hospitalization, reduce the postoperative pain and improve the activity of patients.

We describe a modified technique for the in vitro study of human spermatozoal penetration into hamster oocytes which is easier to master and more simple to perform and needs no complicated facilities.It comprises the following aspects:1 The hamster oviduct is stained with 1％ neutral red agar slics, so that the opening of the oviduct is easy to find and easy to be inserted with needle for flushing eggs.2. A special small tube,3 cm long with a diameter of 0.5 cm is used for fertilization instead of plastic dish with paraffin oil covering the media.3. Ordinary incubator is used rather than CO_2 incubator. With these procedures, the sperm penetration rates we got were 75％, 25％, 40％, 80％ and 46％ respectively in 5 experiments. It could meet the needs to evaluate the fertilizing capacity of human spermatozoa.

Objective To explore the posttraumatic stress disorder(PTSD) symptoms, coping styles and security sense of witnessed college students. Methods A cross-sectional survey was carried out among 800 freshmen and sophomores students from a medical university in Guangzhou. The participants were asked to fill posttraumatic stress disorder self-rating scale (PTSD-SS) ,simplified coping style questionnaire(SCSQ) and security questionnaire(SQ). Results 155 college students had witnessed injury and the ratio was 20.5% ( P ＜ 0.05 ).Compared to the students who hadn't witnessed experience, the witnessed college students had less security( 50.78± 5.63 vs 52.01 ± 5.19 ), less active coping styles ( 34.94 ± 5.42 vs 35.88 ± 5.45 ) and less sense of control (25.07 ±4.25 vs 26.11 ±3.71 ) ,and they had got a higher score in PTSD symptoms and negative coping styles.Apart from the interpersonal sense of security,the other differences were significant between the two groups ( P＜0.05 ); the scores of PTSD symptoms had significant correlation with the total and subscales of coping styles and sense of control (P ＜ 0.01 or P ＜ 0.05 ). Conclusion The witnessed college students have severer PTSD symptoms and less security,and tend to take negative coping styles.

Chronic stress can induce hippocampus injury such as neuron loss, dendrite atrophy, but its mechanism and molecular basis remain unclear up to now. To understand the molecular mechanism on protein level and find the crucial proteins which correlated with chronic stress-induced injury, two-dimensional electrophoresis was applied to separate the hippocampal total proteins of control group and restraint stressed rats, then the differential expressed proteins were detected by image analysis and identified by matrix assisted laser desorption /ionization time of flight mass spectrometry (MALDI-TOF-MS) as well as database searching. Moreover, the 2-DE results were verified on the mRNA level by semi-quantitative RT-PCR. The hippocampal 2-DE map with high resolution and good reproducibility of control and stress group rats were obtained. Fourteen differentially expressed protein spots were detected and eleven proteins were successfully identified, most of these proteins were involved in the process of energy metabolism and signal transduction. These results provide a clue for elucidating the mechanism of chronic stress-induced hippocampal injury and are useful for elevating the adaptability to stress.

Objective To assess the accuracy of SIEMENS Osteo software.Methods The mineral content of 20 cadaver lumber bodies(L 1～L 5) was measured by quantitative CT,and compared with bone ash analysis.Results Mineral content and bone ash weight had a linear correlation,which could be expressed by followed regress equation:ash weight=0.92432?BMD+39.0633.The results with quantitative CT method were all lower than that with bone ash analysis (average lower 29.196 mg/cm 3).Conclusion There are some deviations for measuring bone mineral content with this software.The deviation is within the limit of the theory error of single energy quantitative CT.The result of the measurement shoud be accurate after proofread.

Objective To evaluate the calculation and report of detection index and the statistics analysis of group comparison in high risk group,a problem of medical science study.Methods Relevant literature was consulted so that the methods could be listed of the detection index and the current statistic analysis of group comparison in high risk group.Results The current report about detection ratio and the statistics analysis of group comparison in high risk group proved to be mistaken,and the statistics analysis of group comparison was not the comparison of detection ratios in high risk group.Conclusions It is necessary to calculate and report the detection ratio when expressing the detection index.The statistics difference should be tested about constituent ratio in the group comparison,after excluding patient group.At the same time,some explanation should be given by the author in the composition.

Objective: To compere OQL of recruits of armed police in south area fore-and-aft the basic military training.Methods: The WHOQOL-BREF Scale was used to investigate 539 recruits before the training and at the end of the 3rd month of the basic military training.Results: The score of physiological,psychological,social,and environmental domain of the OQL of recruits before the basic military training were68.90?13.36,65.65?14.28,67.16?16.71,61.06?14.23,The score of physiological,psychological,social,and environmental domain of the OQL of recruits before the basic military training were 71.52?12.16,70.34?14.78,74.10?22.00,66.07?14.36,the differences were salient.Conclution:The Basic Military Training can improve the OQL of recruits of armed police in south area.The improvement are bear on the education of adapting and improved training.

BACKGROUND: Bone mineral content(BMC) can be determined by many methods, which are different in detecting position, clinical significance and differentiation between normal group and people with osteoporosis.OBJECTIVE: To establish a normal BMC standard by observing lumbar BMC with quantitative computerized tomography(QCT) measurement in Shenzhen women, so as to provide basis for clinical prevention and treatment of osteoporosis in the region.DESIGN: Randomized controlled, observational and comparative study taking normal women as subjects.SETTING: Medical imaging department of a hospital at district level.PARTICIPANTS: A total of 120 women aged 30 to 69 years, who received physical examination in the Central Hospital of Longgang district in Shenzhen from September 2000 to March 2002, were enrolled in this study. They were divided into four groups: 30 - 39 age group, 40 - 49 age group, 50 - 59 age group and 60 - 69 age group with 30 in each.METHODS: Trabecular and cortical BMC of lumber bodies(L1-3) were measured with QCT software so as to establish a standard of normal BMC in Shenzhen women and compare it with that of other regions.MAIN OUTCOME MEASURES: The mean BMC in Shenzhen women, and comparison with that of other regions at home and abroad.RESULTS: The results of QCT showed linear correlation between BMC and bone ash weight, which could be expressed by the following linear regression equation: ash weight =0. 92432 × BMC + 39. 0633. Lumbar BMC loss increased with age in Shenzhen perimenopausal women. The annual loss of spongy bone and compact bones was 1.38% and 0. 84%, respectively. BMC of women aged 50 to 59 years was[ (135.31 ± 18.36) mg/cm3], obviously higher than that of women in Changchun city, Beijing city and the United States [(120.21 ±37.40), (116.7 ±26.6), and(119.5 ±27.1) mg/cm3]( t = 2. 002, 3. 383, 3. 636, P ＜ 0.05 - 0. 01 ) . Moreover, BMC of women aged 30 to 39 years was also obviously higher than that of corresponding American women( t = 3.119, P ＜ 0.01 ). No significant difference was found in BMC among women of the other age groups in these regions( P ＞ 0. 05).CONCLUSION: This is the first time in our country to establish a standard of normal BMC in perimenopausal women with QCT measurement, which provides basis for early prevention and treatment of osteoporosis as well as evaluation of prognosis and fracture risk.