The beta-secretase is one of prospective targets against Alzheimer's disease (AD). A three-dimensional quan titative structure-activity relationship (3D-QSAR) model of Hydroethylamines (HEAs) as beta-secretase inhibitors was established using Topomer CoMFA. The multiple correlation coefficient of fitting, cross validation and external validation were r2 = 0.928, q(loo)2 = 0.605 and r(pred)2 = 0.626, respectively. The 3D-QSAR model was used to search R groups from ZINC database as the source of structural fragments. As a result, a series of R groups with relatively high activity contribution was obtained to design a total of 15 new compounds, with higher activity than that of the template molecule. The molecular docking was employed to study the interaction mode between the new compounds as ligands and beta-secretase as receptors, displaying that hydrogen bond and hydrophobicity played important roles in the binding affinity between the new compounds and beta-secretase. The results showed that Topomer CoMFA and To pomer Search could be effectively used to screen and design new molecules of HEAs as beta-secretase inhibitors, and the designed compounds could provide new candidates for drug design targeting AD.
Amyloid Precursor Protein Secretases ; antagonists & inhibitors ; Drug Design ; Hydrophobic and Hydrophilic Interactions ; Ligands ; Molecular Docking Simulation ; Quantitative Structure-Activity Relationship

Objective To find out a PPM-based transcutaneous wireless bidirectional communication system for implantable medical device.Methods The wireless communication system included device implanted in the body,controller and PDA outside the body.Pulse position modulation(PPM) was used for the wireless bidirectional communication between device implanted in the body and controller outside the body.Results A PPM-based transcutaneous wireless communication system was realized.Its wireless bidirectional communication distance between device implanted in the body with titanium container and controller outside the body was over two inches.This system was with good position availability.Conclusion Pulse position modulation is successfully used for transcutaneous wireless communication system,and average power consumption for communication device implanted in the body is lowered greatly compared with ASK modulation method.At the same time,the volume of communication device implanted in the body is decreased for antenna common-using idea.

Objective To explore the efficacy of surgery in the treatment of hepatolithiasis .Methods The clinical data of 98 patients with hepatolithiasis treated with different surgical procedures were retrospectively anan -lyzed,there were 91 cases transhepatic cholangiolithotomy treatment and 7 cases hepatolobectomy .Results 25 cases were found residual stone after operation .Recurrence calculus(10 cases),liver abscess(2 cases),and complicated by bile duct carcinoma(4cases) were found in following -up.2 cases were dead.The total effective rate was 97.96%. Conclusion Correct operation methods of calculus of intrahepatic duct was the key of reduction residual stone after operation.Resection extra-lateral lobe and choledchoscope are main means of reduction residual stone after opera -tion.

Objective To explore the effect of surgical management of left colon cancer with acute obstruction.Methods A retrospective analysis was made on the clinical data of 85 cases with acute obstructive colorectal carcinoma treated by one-stage resection.Among the 85 cases,there were 48 cases of left colon obstruction (treatment group),and the control group included 37 cases of right colon cancer.To compare the occurrence of postoperative complications.Results 20 cases had postoperative complication in the treatment group,among which,2 cases had anastomosis fistula,4 cases of pulmonary infection,5 cases of abdominal abscess,6 cases of incision infection and 3 cases of intestinal adhesion.In control group,there were 15 cases had complication,among which,1 case had anastomosis fistula,3 cases of pulmonary infection,3 cases of abdominal abscess,5 cases of incision infection and 3 cases of intestinal adhesion.There was no significant difference in incidence rate of complication between two groups (P ＞ 0.05).Conclusion One stage resection in the treatment of left colon cancer with acute obstruction is safe and feasible.

Objective To investigate the different influencing on the healing of anastomotic stoma between two kinds of alimentary canal reconstruction after laparoscopic radical resection of low rectal cance.Methods The clinical data of July 2013 -January 2016 suffering from stage Ⅱ -Ⅲ low rectal cancer and in our hospital underwent laparoscopic colorectal cancer radical surgery patients was retrospectively analyzed.Through accessing to medical records,the patients of diabetes,hypoproteinemia,malnutrition,preoperative uncorrectable cases and received neoadjuvant therapy were excluded.More than a total of 59 cases were enrolled,34 cases of them received traditional alimentary canal reconstruction(traditional group,including 26 cases of low rectal cancer,8 cases of super low rectal cancer,also 21 cases of them in stageⅡand 13 cases in stage Ⅲ),25 cases of them received anal anastomosis resection (including 18 cases of low rectal cancer,7 cases of super low rectal cancer,also 20 cases of them in stage Ⅱ and 5 cases in stageⅢ).Results In the traditional group,1case of 34 patients with anastomotic leakage,3 cases of anastomotic bleeding, while in the improved group,2cases of 25 patients with anastomotic leakage,2 cases of anastomotic bleeding.There was no significant difference in the incidence of anastomotic leakage and anastomotic bleeding between the two groups (3cases vs.2cases,1case vs.2cases,χ2 =0.13,0.75,all P >0.05).All cases did not occur in patients with anastomotic stenosis,and all patients were cured and discharged.Conclusion Each of the two methods have their advantages and disadvantages.Through preoperative,intraoperative evaluation of tumor status,reasonable choice of tumor treatment and anastomosis,is more conducive to postoperative recovery.

Objective To explore the levels of leptin(LEP) and soluble leptin receptor (sOB‐R) in breast cancer patients′ser‐um ,and to discuss the relationship between LEP ,sOB‐R ,free leptin index(FLI) and the patients′clinical pathologic features .Meth‐ods 70 serum specimens of breast cancer patients who confirmed by pathological diagnosis were collected before the surgery ,the serum of benign breast disease group(n=50) and normal group(n=50) were also collected as control .The levels of LEP and sOB‐Rinserumweredetected,andtheresultafterbodymassindex(BMI)correctionwereanalyzed.Finally,therelationshipbetweenthe expression of LEP ,sOB‐R and clinical pathologic features were analyzed .Results The serum level of LEP in breast cancer group was highly increased than the other two groups (P<0 .05) ,and sOB‐R was reduced(P<0 .05) .After BMI correction ,LEP was still highly increased(P<0 .05) ,but sOB‐R was no significant difference (P>0 .05) .The level of LEP in the postmenopausal breast cancer patients were highly increased than menopause patients (P>0 .05) ,and the expression of LEP in cancer group were signifi‐cant higher than two control groups by both postmenopausal and menopause (P>0 .05) .The result suggested the serum level of LEP and FLI are associated with pTNM stages and lymph node metastases (P<0 .05) ,and elevated level of LEP in postmenopausal patients had differences in pTNM stages and lymph node metastases (P< 0 .05) .Conclusion The serum LEP level and the FLI may be potential indicators to evaluate the prognosis of the patient with breast cancer .The serum LEP may promoted the process of the postmenopausal patients of breast cancer .

Objective To compare the influence of laparoscopic inguinal hernia repair ( TAPP) and open inguinal hernia repair(Lichtenstein) on clinical serum swelling and the prevention and treatment strategy.Methods From September 2015 to September 2016,117 patients with inguinal hernia in the Second People's Hospital of Shantou were selected.The patients were divided into TAPP group and Lichtenstein group according to the operation mode .The incidence of seroma,occurrence,characteristics and diagnosis and treatment of the two groups were compared.Results There were 64 cases in the TAPP group,aged 25-73 years old,the median age was 57 years,58 cases of indirect inguinal hernia,4 cases of direct hernia ,2 cases of femoral hernia ,3 cases of refractory hernia.There were 53 cases in the Lichtenstein group,aged 24-84 years old,the median age was 63 years,41 cases of indirect inguinal hernia , 10 cases of direct hernia,2 cases of femoral hernia ,7 cases of refractory hernia.There was no statistically significant difference in the incidence rate of seroma between the two groups (P＝0.875).There were no statistically significant differences in the incidence rate of different types of seroma (all P＞0.05).There was no need for treatment of 0-II type seroma.The type III -IVa clinical seroma could be given local puncture parallel compression treatment , improved after treatment.After drainage and anti -inflammatory treatment, type IVb seroma was improved. Conclusion There is no difference in the incidence of seroma and the treatment between the two surgical procedures after inguinal hernia repair.