Objective:To investigate the effects of a loading dose of clopidogrel hydrogen sulfate on hemorheology and neurological function in patients with acute progressive cerebral infarction.Methods:A total of 110 patients with acute progressive cerebral infarction who received treatment between January 2018 and January 2019 in the Affiliated Hospital of Shaoxing University, China were included in this study. They were randomly assigned to receive either conventional treatment (control group, n = 55) or treatment with a loading dose of clopidogrel hydrogen sulfate based on conventional treatment (study group, n = 55) for 2 weeks. Hemorheological parameters, National Institute Health of Stroke Scale (NIHSS) scores and adverse reactions were compared between the study and control groups. Results:After treatment, the levels of hemorheological parameters in both groups were obviously decreased. Plasma viscosity, high-shear whole blood viscosity, low-shear whole blood viscosity, fibrinogen level and hematocrit in the study group were (1.01± 0.37) mPa/s, (4.23 ± 0.35) mPa/s, (8.36 ± 1.64) mPa/s, (1.23 ± 0.28) g/L, (40.08 ± 5.04) %, respectively, which were significantly lower than those in the control group [(1.84 ± 0.52) mPa/s, (5.44 ± 0.39) mPa/s, (10.54 ± 1.79) mPa/s, (2.30 ± 0.37) g/L, (44.36 ± 5.12) %, t = 5.485, 8.594, 9.523, 7.789, 11.236, P = 0.019, 0.006, 0.004, 0.007, 0.001]. After treatment, NIHSS scores in the study group were significantly lower than those in the control group [(3.11 ± 1.17) points vs. (6.43 ± 2.25) points, t = 10.416, P = 0.003). There was no significant difference in the incidence of adverse reactions between study and control groups [5.45% (3/55) vs. 9.09% (5/55), χ2 = 0.539, P = 0.463). Conclusion:The loading dose of clopidogrel hydrogen sulfate is highly effective in the treatment of acute progressive cerebral infarction and it can greatly improve hemorheological parameters and neurological function.

Objective To explore the effectiveness of mental rehabilitation group management on the survival skills of community patients with schizophrenia.Methods Totally 106 community patients with mental disorder registered at a sub-district health service center in Hangzhou between January 2014 and August 2016 were equally divided into an intervention group and a control group according to the random number table. The patients in both groups received original drug treatment and regular rehabilitation training, while the patients in the intervention group, on this basis, received mental rehabilitation group management activities for 4 weeks. The effectiveness of this intervention was measured and compared with survival skills training scale (SST) and Social Disability Screening Schedule (SDSS) before and after the intervention.Results Four weeks later, the SST score of the patients in the intervention group increased from (33.11±1.88) to (70.03±2.15), and their SDSS score decreased from (16.68±0.38) to (8.92±0.32), showing that they had better rehabilitation effects than the patients in the control group (t=-12.952, -14.760;P<0.01).Conclusions The model of mental rehabilitation group management can effectively improve the survival skills and interpersonal skills of community patients with schizophrenia, thereby helping them to return to the society successfully.

OBJECTIVE:To compare the efficacy and safety of levonorgestrel intrauterine system and mifepristone in the treat-ment of perimenopausal dysfunctional uterine bleeding. METHODS:200 patients with perimenopausal dysfunctional uterine bleed-ing were randomly divided into observation group (100 cases) and control group (100 cases). Patients in the observation group placed levonorgestrel intrauterine system (containing levonorgestrel 52 mg),patients in control group received Mifepristone cap-sule 10 mg/d,oral,the treatment course for 2 groups were 3 months. Clinical efficacy,endometrial thickness,menstruation(PBAC score),hemoglobin level before and after treatment and incidence of adverse reaction in 2 groups were observed. RESULTS:After treatment,the total effective rate in observation group was significantly higher than control group,incidence of adverse reactions was significantly lower than control group,the differences were statistically significant(P<0.01). Before treatment,there were no significant differences in the endometrial thickness,PBAC score and hemoglobin level between 2 groups;after treatment,endome-trial thickness and PBAC score were significantly lower than before,and observation group was lower than control group;hemoglo-bin level was significantly higher than before,and observation group was higher than control group,the differences were statistical-ly significant(P<0.01 or P<0.05). CONCLUSIONS:The efficacy and safety of levonorgestrel intrauterine system are significant-ly superior to mifepristone in the treatment of perimenopausal dysfunctional uterine bleeding.

Objective To observe the comprehensive clinical effect of biofeedback combined with psychological nursing on the treatment of functional constipation ( FC) .Methods A total of 76 cases of FC were collected and randomly divided into control group ( 38 cases ) and observation group ( 38 cases ) by random number method .Patients in control group were treated with biofeedback treatment; and patients in the observation group were treated with biofeedback combined with individualized psychological nursing . Health state survey questionnaire ( SF-36 ) , self-rating anxiety scale ( SAS) and self-rating depression scale ( SDS ) were applied to evaluate two group′s quality of life and psychological status before and after intervention.Improvement of clinical situation of two groups was compared .Results After treatment, the symptom scores of two groups were significantly lower than those before treatment .Improvement of difficult defecation(0.84 ±0.50), endless defecate feeling (0.84 ±0.38) and anal or rectal obstruction (0.53 ± 0.51)of observation group was superior to that of the control group (t=2.458,2.598,2.167;P<0.05). After treatment , the scores of SF-36 of two groups were higher than those before intervention . Four dimensions of vitality(90.22 ±11.54), emotional function(89.57 ±13.51), mental health(86.28 ±9.47) and general health ( 89.09 ±9.81 ) of observation group were better than those of control group ( t =-2.184,-2.196,-3.831,-2.238;P<0.05).After treatment, the scores of SAS (43.41 ±6.96)and SDS (40.57 ±6.69)of the observation group were lower than those of the control group (t=2.195,2.356;P<0.05).Conclusions Biofeedback combined with psychological nursing not only can obviously improve the patients′clinical symptoms , but also improve the patients quality of life and abnormal mental state .

Objective To verify the reliability of our previously established reverse-transcription loop-mediated isother-mal amplification ( RT-LAMP) method for the detection of sentinel lymph nodes metastasis in breast cancer patients .Meth-ods Sentinel lymph nodes of breast cancer patients were analyzed by RT-LAMP and FDA-approved GeneSearch methods respectively, and the consistency of the two methods was assessed with a kappa concordance test.Results One hundred and thirty-four cases of sentinel lymph node samples were collected from seven hospitals in Beijing .Using the GeneSearch assay as the gold standard, the sensitivity, specificity and consistentcy of RT-LAMP were 96.2%(25/26),96.3%(104/108) and 96.3%(129/134), respectively.Statistical analysis showed that the two methods were consistent (Kappa=0.8857, P<0.001).Conclusion RT-LAMP is highly consistent with GeneSearch ,efficient,simple and inexpensive, promising a good prospect of application to intra-operative detection of sentinel lymph nodes metastasis for breast cancer patients.

BACKGROUND:Studies have demonstrated that Fe-Cr-Mo soft magnetic aloy has desired magnetic properties and machining properties. Surface Cr6+ plating treatment can significantly enhance the corrosion resistance in oral environment, but its biosecurity needs further testing. OBJECTIVE: To evaluate the biocompatibility of Fe-Cr-Mo soft magnetic aloy with chromium plating. METHODS:Logarithmic growth phase L929 cel suspension was obtained and seeded in 96-wel plates at a cel concentration of 6×107/L. Pure titanium extract, Fe-Cr-Mo soft magnetic aloy original extract, Cr6+-plated Fe-Cr-Mo soft magnetic aloy and PVC extract were added respectively. After 5 days of culture, cel morphology and adherent circumstances were observed. The absorbance value was detected using cel counting kit-8 assay. The relative growth rate of cels in each group was calculated. The cytotoxicity grades of materials were evaluated. RESULTS AND CONCLUSION:In the pure titanium extracts group, the cels with normal morphology showed good adherent growth and no cytotoxicity. In the Fe-Cr-Mo soft magnetic aloy original extract group, the cel morphology and growth status were both good, with occasionaly individual cel lysis. Scattered reddish brown particles were visible in the culture solution, showing no or very mild cytotoxicity. In Cr6+-plated Fe-Cr-Mo soft magnetic aloy extract group, the cels grew wel and showed no or very mild cytotoxicity. In PVC extract group, more than 70% of cels were vacuole-shaped and presented with pyknosis or dissolution, there was a large number of cel debris, and cel growth was inhibited in over 50% cels, showing moderate cytotoxicity or above. The cytotoxicity of Cr6+-plated Fe-Cr-Mo soft magnetic aloy extract was grade 0-1. These results demonstrate that Fe-Cr-Mo soft magnetic aloywith chromium plating has good biocompatibility.

BACKGROUNDThis multicenter prospective study aimed to assess the utility of dynamic enhanced magnetic resonance imaging (MRI) prior to breast-conserving surgery for breast cancer.

METHODSThe research subjects were drawn from patients with primary early resectable breast cancer treated in the breast disease centers of six three-level hospitals in Beijing from 1 January 2010 to 31 December 2012. The participants were allocated to a breast-conserving surgery group (breast-conserving group) or a total mastectomy group (total mastectomy group). Enhanced MRI was used to measure breast volume, longest diameter of tumor and tumor volume. The correlations between these measurements and those derived from histopathologic findings were assessed. The relationships between the success rate of breast-conserving surgery and MRI- and pathology-based measurement results were statistically analyzed in the breast-conserving group.

RESULTSThe study included 461 cases in the total mastectomy group and 195 in the breast-conserving group. Allocation to these groups was based on clinical indications and patient preferences. The cut-off for concurrence between MRI- and pathology-based measurements of the longest diameter of tumor was set at 0.3 cm. In the total mastectomy group, the confidence interval for 95% concurrence of these measurements was 35.41%-44.63%. Correlation coefficients for MRI and histopathology-based measurements of breast volume, tumor volume and tumor volume/breast volume ratio were r = 0.861, 0.569, and 0.600, respectively (all P < 0.001). In the breast-conserving group, with 0.30 cm taken as the cut-off for concurrence, the 95% confidence interval for MRI and pathology-based measurements of the longest diameter of tumor was 29.98%-44.01%. The subjective and objective success rates for breast-conserving surgery were 100% and 88.54%, respectively.

CONCLUSIONSThere were significant correlations between dynamic enhanced MRI- and histopathology-based measurements of the longest diameter of breast lesions, breast and tumor volumes, and breast volume/tumor volume ratios. Preoperative MRI examination improves the success rate of breast-conserving surgery.

In 2010, the artificial synthesis of Mycoplasma mycoides triggers the new era of synthetic biology. This great breakthrough is achieved mainly thanks to the powerful DNA recombinant ability of yeast. In recent years, except for the methods used for large DNA assembly on the basis of in vivo homologous recombination, various different DNA assembly methods in vitro, based on the concept of DNA ligation or polymerization, have also been developed, such as Biobrick\BglBrick, SLIC and Gibson one-step assembly. Application of these new technologies has greatly accelerated the construction of synthetic part libraries, biosynthetic pathway and even microbial chromosomes. In fact, all DNA assembly methods are derived from the combinations of DNA joining and organizational schemes. This review describes the brief introduction of the main in vivo and in vitro DNA assembly protocols developed so for, which will benefit the construction of different types of synthetic functional devices and also biosynthetic pathways in the research of synthetic biology in China.
DNA ; biosynthesis ; chemistry ; genetics ; DNA, Recombinant ; biosynthesis ; genetics ; Genetic Engineering ; methods ; Metabolic Networks and Pathways ; Synthetic Biology ; methods

Objective To evaluate advantages and disadvantages of different pacing modes of cardiac resynchronization therapy (CRT).Methods Twelve dogs with heart failure were performed in every dog at random,and the pacing modes employed in the test included right atrium-different sites of ventricle,and ventricular sites included right ventricular bifocal (RV-Bi),biventricular (Bi-V),left ventricular (LV).The pacing frequency was 180 times per minute,and the results were measured before pacing and after 15 minutes when the pacing became stable in Color Doppler echocardiography,including left ventricular enddiastolic diameter (LVEDd),left ventricular ejection fraction (LVEF),interventricular mechanical delay (IVMD),interventricular septum and left ventricular posterior wall motion delay (SPWMD),left ventricular 12-segment peak time standard deviation (Ts-SD).Results (1)Compared with before pacing,at the RV-Bi,Bi-V,and LV pacing modes,LVEDd,IVMD,SPWMD,and Ts-SD decreased,LVEF increased,the difference was statistically significant [(42.42 ± 3.94) mm vs (34.00 ± 4.07) mm,(34.17 ± 3.95)mm,(33.75 ±4.18)mm; (28.08 ±4.01)mm vs (13.00 ±3.64) mm,(11.95 ±2.54)mm,(12.08 ±3.51) mm; (75.00 ± 10.22)mm vs (51.75 ±9.84) mm,(20.66 ±7.41) mm,(20.75 ±7.56) mm; (25.08±4.16)mm vs (14.91 ± 3.31)mm,(7.50 ±4.24) mm,(7.41 ±3.39)mm;(32.91 ±4.46)mm vs (41.50 ±4.16)mm,(42.00 ±4.63) mm,(42.41 ±4.99)mm,P ＜0.05].(2)Compared with RV-Bi pacing mode,at the Bi-V,LV pacing modes,SPWMD and Ts-SD decreased,the difference was statistically significant(P ＜ 0.05); there was no significant difference among LVEDd,IVMD,and LVEF (P ＞0.05).(3)There was no significant difference in LVEDd,IVMD,SPWMD,Ts-SD and LVEF between LV and Bi-V pacing (P ＞ 0.05).Conclusions The hemodynamic effects of RV-Bi and LV pacing modes were similar to that of Bi-V pacing,and they can be used as CRT biventricular pacing alternative modes; however,the mechanisms of improving ventricular synchronization are not identical in above pacing modes.

Objective To evaluate effects of right ventricular septal pacing modes on treatment of heart failure.Methods Twelve dogs with heart failure were performed in every dog at random,and the pacing modes employed in the test included right atrium-right ventricular apex (RVA),right atrium-right ventricular septal(RVS),and right atrium-biventricular (Bi-V) ; The pacing frequency was 180 times per minute.The results were measured before pacing and after 15 minutes when the pacing became stable in Color Doppler echocardiography,including left ventricular end-diastolic diameter (LVEDd),left ventricular ejection fraction (LVEF),interventricular mechanical delay (IVMD),interventricular septum and left ventricular posterior wall motion delay (SPWMD),and left ventricular 12-segment peak time standard deviation (Ts-SD).Results Right ventricular septal pacing mode:(1)Compared with parameter before pacing and RVA pacing,LVEDd,IVMD,SPWMD,and Ts-SD decreased and LVEF increased,and the difference was significant(P ＜0.05).(2)Compared with Bi-V pacing,LVEDd,IVMD,and SPWMDandTs-SD increased and LVEF decreased,and the difference was significant (P ＜ 0.05).Conclusions Right ventricular septal pacing could improve ventricular synchrony and cardiac function partly,and the effect was better than right ventricular apical pacing but less than biventricular pacing,also could not be a alternative models of cardiac resynchronization therapy for heart failure.