The decidua of pseudopregnant rats and of those effected by high dosage of luteinizing hormone-releasing hormone analogue (LH-RH-A) were studied histologically.After inducement of pseudopregnancy, 29 Wistar virgin rats were divided into experimental and control groups. The experimental group was injected with 200?g. of LH-RH-A subcutaneously daily for four days, while to the control group, physiological saline was injected instead. Both experimental and control animals were killed on the 9th, 11th and 13th day of pseudopregnancy.The uteri were fixed with appropriate fixatives and paraffin sections were processed with HE, phloxine-tartrazine, Foots and aldehyde fuchsin staihing methods.On the 9th day decidua of the control rats are well developed with many endometrial granulated cells, while in the decidua of the experimental group, the decidual cells become pyknotic, and the granulated cells are barely seen. The results suggest that a high dosage of LH-RH-A advances the necrosis of decidua of the pseudopregnant rats.

29 virgin female Wistar rats were divided into experimental and control groupson the 5th day of pseudopregnancy.The experimental animals were injected with200 ?g.of LH-RH-A subcutaneously daily in 5th-8th day,while in the controlgroup physiological saline was used instead.Both experimental and control animalswere killed on 9th,11th,13th days of pseudopregnancy.Histochemical techniques were applied to cryostat sections to show the activityof the following enzymes:SDH,LDH,NE,~5△A-3?-HSD,G6Pase,TPPase,AlPand AcP;PAS,Oil red O,and gallocyanin-chromalum staining methods were usedto show carbohydrates,fats and RNA respectively.The above enzymatic reactions of the decidual cells of the experimental animalswere negative,while those of the stromal cells were positive on 9th day.Incomparison,the results of the decidua of the control group on 13th day are verysimilar to the decidua of the experimental group on the 9th day.The resultssuggest that a high dosage of LH-RH-A only advances degeneration of thedecidua.

Objective:To discuss the possibility of modifying nonfunctional distractors to improve the quality of multiple-choice questions in medical examination through analyzing the changes in the difficulty and discrimination of items and the selection rate of modified distractors.Methods:Thirty-two multiple-choice questions involving nonfunctional distractors from a medical examination were studied. According to the item-writing guidelines, experts modified nonfunctional distractors based on actual measurements. We analyzed the changes in the difficulty and discrimination of items and the selection rate of modified distractors before and after item modification using the paired Wilcoxon test, and investigated the correlation of item difficulty and discrimination before and after item modification by Spearman's rank correlation analysis.Results:Six questions were modified due to technical factors, and 26 questions were modified due to weak interference in knowledge content. Before and after nonfunctional distractor modification, the difficulty values of the questions were 0.676 (0.558, 0.893) and 0.637 (0.531, 0.839), respectively; the discrimination values (point-biserial correlation) were 0.261 (0.150, 0.316) and 0.262 (0.138, 0.358), respectively; and the discrimination index values were 0.215 (0.113, 0.352) and 0.259 (0.138, 0.346), respectively. There were significant differences in the difficulty and discrimination index of items before and after modification. The difficulty and discrimination of items before and after modification were both significantly correlated. The selection rates of modified distractors were 0.009 (0.003, 0.015) and 0.044 (0.021, 0.092) before and after modification, respectively, which were significantly different.Conclusions:Nonfunctional distractors in this study were mainly caused by reasons in the contents of the test questions, less in technical defects. Through the analysis and modification of nonfunctional distractors, the selection rate of nonfunctional distractors can be effectively increased, and item difficulty and discrimination can be improved.

Objective:To investigate the effect of SCN1A gene polymorphism (SCN1A-rs3812718) on the alterations of spontaneous brain activity using amplitude of low-frequency fluctuations (ALFF) of MR in patients with temporal lobe epilepsy (TLE).Methods:A total of 37 TLE patients (TLE group) admitted to the Epilepsy Center of the 900th Hospital of Joint Logistic Team from March 2018 to August 2019 were retrospectively analyzed, and another 28 healthy volunteers matched for gender, age, and years of education with the TLE group were selected as the healthy control group (HC group). Sixty-five subjects were divided into four groups by genotype and diagnosis: 34 cases in AA/AG-TLE subgroup, 3 cases in GG-TLE subgroup, 20 cases in AA/AG-HC subgroup and 8 cases in GG-HC subgroup. All subjects underwent sagittal 3D-T 1WI and resting-state functional MRI using a Siemens 3.0 T Trio Tim MR scanner. Then ALFF values of the four groups were calculated using DPABI by the MATLAB 2010 platform. The ALFF values between two groups were compared by independent samples t-test. The ALFF values of different genotypes at rs3812718 locus in TLE and HC group were analyzed by multivariate analysis of variance to find out the corresponding brain regions with interaction, and then post hoc simple effect analysis was performed. Results:The ALFF values in TLE group significantly increased in left marginal lobe, left parahippocampal gyrus, left fusiform gyrus, left hippocampus, right insular lobe and right inferior temporal gyrus (Alphasim corrected P<0.001) and decreased in the left superior frontal gyrus, left middle frontal gyrus, left inferior frontal gyrus, right middle frontal gyrus, right precuneus, left precuneus, bilateral cingulate gyrus and right angular gyrus (Alphasim correction P<0.05) compared with HC group. Subjects carrying the non-risk G allele had higher ALFF values in the right inferior temporal gyrus, right fusiform gyrus, and right cerebellum than subjects carrying the risk A allele ( t=3.30, Alphasim corrected P=0.002). There was a significant interaction effect on posterior cerebellar lobe, left anterior cerebellar lobe, left inferior temporal gyrus, left superior parietal lobule and right precuneus of TLE patients with SCN1A-rs3812718 genotype. Post-hoc simple effect analysis showed that ALFF significantly increased in the left posterior cerebellar lobe, left anterior cerebellar lobe, left inferior temporal gyrus and left fusiform gyrus in GG-TLE subgroup ( t=5.97, P<0.001), but significantly decreased in the right superior parietal lobule, right precuneus, right posterior cerebellar lobe in AA/AG-TLE subgroup compared to the HC group. Compared with GG-TLE subgroup, ALFF in left posterior cerebellar lobe, left fusiform gyrus and left inferior temporal gyrus decreased in AA/AG-TLE subgroup. Conclusion:SCN1A gene polymorphism in the rs3812718 locus affects spontaneous neural activity in resting state, which may be one of the pathophysiological mechanisms of TLE.