BACKGROUND: Streptococcus mutans (S. mutans) is generally considered to be the principal aetiological agent for dental caries, thrS gene may relate to the virulence of S. mutans involved in the adherence, acidogenicity and acidodurance.OBJECTIVE: To investigate the conservation status of the thrS gene of S. mutans and to construct the homologous recombinant plasmid.METHODS: Southern Blot was used to analyze the distdbuUon of thrS gene in S. mutans. The upstream and downstream sequences of thrS gene were cloned respectively into multiple cloning sites of suicide plasmid pFW5 to construct the recombinant plasmid,RESULTS AND CONCLUSION: The thrS gene was conserved in 6 strains of S. mutans in this test. By PCR analysis and enzyme digesting, it was confirmed that S. mutans thrS gene homologous recombinant plasmid was successfully constructed,which can be used in future research of construction of thrS -negative mutans of S. mutans strain UA159.

ObjectiveTo investigate the effect of nursing intervention on quality of life in patients undergoing total hysterectomy. Methods100 patients undergoing total hysterectomy were randomly divided into the intervention group and the control group with 50 patients in each group.The patients in the control group were given routine instruction after admission,before and after operation.The patients in the intervention group were given systematic nursing intervention on the basis of routine nursing.The quality of life three months postoperation was compared between two groups. ResultsThe quality of life in the intervention group three months after operation was better than that of the control group. ConclusionsSystematic nursing intervention for patients undergoing total hysterectomy during hospitalization can improve their postoperative quality of life.

Objective:To knock the phospho-sugar mutase gene (psm) out of the genome of S. mutans strain UA159 and to construct the mutant will lay a foundation for the study of the function of the psm. Methods:Two upstream and downstream DNA sequences of the psm were selected and cloned respectively into multiple cloning sites I and II of suicide plasmid pFW5 to construct the recombinant plasmid which was confirmed by enzyme digesting and sequencing. The recombinant plasmid was transformed into S. mutans UA159 by natural transformation and antibiotic was used to screen the positive transformants. According to the principle of homologous recombination, allelic exchange between the recombinant plasmid and S. mutans UA159 was achieved. Results:By PCR analysis and sequencing, it was confirmed that the psm of S. mutans UA159 was substituted for resistant gene of spectinomycin. Conclusion: The psm-negative mutants of S. mutans UA159 is successfully constructed.

Objective:To construct the prokaryotic expression vector pET28a(+)-comE, to get the highest expression of comE in E. coli BL21(DE3), and to obtain the purified ComE fusion protein. Methods: ComE gene was amplified by PCR with specific primers from genome of Streptococcus mutans UA159. After digested by two restriction endonucleases BamH Ⅰand Xho Ⅰ, the gene segment was inserted into vector pET28a(+). Then the recombinant vector was transformed into E. coli BL21(DE3). The protein expression was induced by IPTG and the result was confirmed by Western blot. The solubility of the fusion protein was examined by 12% SDS-PAGE, and the expression conditions were optimized. Finally the fusion protein was purified by a two-step purification procedure utilizing Ni2+ chelating column and S75 size exclusion column. Results: The recombinant plasmid was confirmed by PCR, restriction endonucleases digestion and sequence analysis, which showed that the inserted segment was identical to comE gene reported by GenBank without nucleotide mutation. The fusion protein which was confirmed by Western blot can be expressed in E. coli BL21(DE3) and existed both in supernatant and precipitation. The maximum expression product amount was obtained when the A600 value of E. coli BL21(DE3) was 0.4, IPTG concentration was 0.10 mmol/L and induction time was 4 h. Conclusion: The recombinant plasmid is constructed and the ComE fusion protein is purified by the optimum conditions.

Objective: To analyze the level of resilience and its influencing factors in the young and middle-aged patients with type 2 diabetes mellitus ( T2DM ), so as to provide reference for optimizing mental interventions for the patients. Methods: The young and middle-aged patients with T2DM from September 2019 to September 2020 in Hangzhou First People's Hospital, affiliated to the Medical School of Zhejiang University, were selected as the subjects, the general information questionnaire, Perceived Social Support Scale ( PSSS ) , Conner-Davidson Resilience Scale ( CD-RISC ), Diabetes Distress Scale (DDS) and Diabetes Management Self-efficacy Scale ( DMSES ) were used to investigate, the multivariate linear regression model was used to analyze the influencing factors for resilience in young and middle-aged patients with T2DM. Results: A total of 250 questionnaires were distributed and 238 valid questionnaires were recovered. The effective recovery rate was 95.20%. Among 238 patients, 142 cases ( 59.66% ) were males and 96 cases ( 40.34% ) were females; 168 cases ( 70.59% ) were 45-59 years old. The CD-RISC score was 70.49±12.81, PSSS score was 63.70±10.90, DDS score was 2.14±0.87, and DMSES score was 130.22±38.49. The results of multivariate regression analysis indicated that educational level, average monthly family income, fasting blood glucose, self-efficacy, social support and diabetes distress were the influencing factors for resilience of young and middle-aged patients with T2DM ( P<0.05 ). Conclusion The level of mental resilience in young and middle-aged patients with T2DM is mainly related to the level of education, monthly family income, blood glucose control, diabetes distress, self-efficacy and social support.

Objective: To evaluate the quality consistency of four domestic nifedipine sustained release tablets by dissolution test and virtual bioequivalence study by GastroPlus software.Methods: The dissolution curves of the four preparations were determined with the methods described in Japanese orange book and Chinese Pharmacopeia.The f2 factor of dissolution curves was calculated to compare the similarity.The in vitro dissolution data of the original preparation were combined with GastroPlus software to obtain the simulated in vivo absorption curves which were correlated with the actual concentration-time curves.The suitable dissolution medium was selected to evaluate the quality of domestic nifedipine sustained release tablets according to the better in vivo-in vitro correlation (IVIVC).The simulated in vivo absorption parameters obtained from the dissolution data combined with GastroPlus software were used to conduct the virtual bioequivalence study of domestic nifedipine sustained release tablets compared with the original products.Results: The f2 similar factors of the four domestic nifedipine sustained release tablets compared with the original preparation were all less than 50.Compared with that from the method in Japanese orange book, the correlation between the dissolution profiles in vitro and in vivo of original nifedipine sustained release tablets obtained from the method in Chinese Pharmacopoeia was better.The deviation between the simulated Cmax and AUC0-∞ values of the four test tablets and the measured values of the original preparation was within the range of ±20%.Conclusion: The dissolution curves of the four domestic nifedipine sustained release tablets are not similar to that of the original preparation, however, the four preparations are all bioequivalent to the original preparation according to the simulated absorption parameters based on the dissolution method in Chinese Pharmacopeia and GastroPlus software.

To establish guidelines to diagnosis and treatment for distending pain in breasts during menstruation in traditional Chinese medicine (TCM). With delphi method, survey questionnaires were sent to 40 gynecology experts in TCM and integrated traditional and western medicine, and recovery 35 experts were recoveried which, were analyzed by SPSS 11.5. The experts' activity and professional level was high. The expert's are from all over China and express the typical opinions of all experts in this field. The items in the frame of the guidelines to diagnosis and treatment for distending pain in breasts during menstruation in TCM are generally recognized, but different opinions from the card type, governance, in areas such as prescription standard also exist.
Female ; Guidelines as Topic ; Humans ; Medicine, Chinese Traditional ; methods ; Menstruation ; physiology ; Middle Aged ; Pain ; drug therapy ; epidemiology ; etiology ; Surveys and Questionnaires

To establish guidelines to diagnosis and treatment for distending pain in breasts during menstruation in traditional Chinese medicine (TCM). With Delphimethod, sent to the second survey questionnaires to 40 gynecology experts in TCM and integrated traditional and western medicine and recovery 35 experts, and the questionnaires were analyzed with SPSS11. 5. The experts' activity and professional level is high. The experts are from all over China and express the typical opinions of all experts in this field. The items in the frame of the guidelines to diagnosis and treatment for distending pain in breasts during menstruation in traditional Chinese medicine are generally recognized. First draft of the guidelines has basically been formed.
Breast ; physiology ; China ; epidemiology ; Data Collection ; methods ; Female ; Guidelines as Topic ; standards ; Humans ; Medicine, Chinese Traditional ; methods ; Menstruation ; physiology ; Pain ; diagnosis ; Pain Management ; Surveys and Questionnaires

Objective To explore the value of the diagnosis of middle cerebral artery (MCA) stenosis with transcranial Doppler ultrasound (TCD). Methods The clinical data in patients with ischemic cerebrovascular disease examined with digital subtract angiography (DSA)and TCD were analyzed retrospectively. DSA was used as a gold standard to analyze the sensitivity and specificity of the diagnosis of MCA stenosis with TCD. The normal and TCD blood flow velocity with different degrees of stenosis were compared. The best cut-off point of the TCD blood flow velocity of MCA at different degree of stenosis was calculated. Results DSA confirmed that 103 patients had MCA stenosis or occlusion, in which 12 were mild stenosis, 22 were moderate stenosis, 40 were severe stenosis, and 39 were occlusion. Compared to DSA, the sensitivity of TCD in detection of moderate and severe MCA stenosis or occlusion was 78. 8%, the specificity was 96. 0%, and the accuracy was 93. 0%, the missed diagnosis rate was 21. 2%, and the misdiagnosis rate was 4. 0%. As to the blood flow velocity, there was no significant difference between the mild stenosis and normal groups; while there was significant difference between the moderate stenosis and normal groups (P ＜0. 001). In addition, there was no significant difference in blood flow velocity between the moderate stenosis and severe stenosis groups. Determining the cut-off value of the best peak systolic velocity of the moderate stenosis was 163. 5 cm/s, while the best cut-off value of the mean velocity was 108. 5 cm/s. Conclusions TCD has certain advantages in the diagnosis of the MCA stenosis or occlusion, and it can be used as a safe and inexpensive screening means before DSA examination.

BACKGROUND: In post-menopausal women, the reduction of estrogen level is followed by gradual increase of bone absorption, accompanied by increased cytokine synthesis and bone metabolism disorder. Observation of serum interleukin-6(IL-6), osteocalcin(OC), estradiol(E2)and urinary pyridinoline (PYD) in women with osteoporosis may help understand role of these factors in the onset and development of osteoporosis.OBJECTIVE: To investigate the relationship of serum IL-6, OC, E2, and urinary PYD levels with bone metabolism in women with osteoporosis, so as to identify the factors responsible for the occurrence and development of osteoporosis.DESIGN: A case-controlled clinical observation.SETTING: Central Laboratory of Orthopedics, Nanshan People's Hospital of Shenzhen City.PARTICIPANTS: Between January 1999 and December 2001, 25 post-menopausal women with osteoporosis aged 42 -69 years were selected from the Department of Orthopedics, Nanshan People' s Hospital of Shenzhen to constitute the experimental group, with 10 healthy women from the same hospital serving as control group.METHODS: Two milliliters of fasting venous blood and 2 mL urine samples were collected from women in both groups in the morning to determine the contents of IL-6, OC, PYD and E2, respectively.MAIN OUTCOME MEASURES: Serum IL-6, OC, E2 and urinary PYD levels in the subjects.RESULTS: In the experimental group, the IL-6 level was(201.0±79. 9) ng/L, OC(25.5 ± 16.2) μg/L, and PYD(41.3 ±9.7) nmol/mmol (creatinine), all significantly higher than those in control group( t = 2. 159 -2. 953, P < 0.05-0.01) . Serum E2 level in the experimental group (79. 8 ± 73.2) ng/L, however, was significantly lower than that in control group ( t = 2.071, P < 0.05).CONCLUSION: IL-6, OC, PYD and E2 may play important roles in the occurrence and development of osteoporosis, and adjustment of the levels of these factors can be necessary in the treatment of women with osteoporosis.