Polylactic acid (PLA) is a biocompatible and biodegradable polymer, thus it is widely used in the medical area and is much more attractive. There are two main methods to synthetizing PLA, ring-opening polymerization of lactide and condensation polymerization of lactic acid. In this paper, the process of the new research of the PLA synthesis was reviewed. Beside, the PLA synthesis methods of reactive extrusion and direct melting polycondensation were introduced, which are two high efficiency methods. Finally, the foreground of PLA synthesis was prospected.

This paper started from the relevant concepts of nursing students'professional values , discussed the core value of nursing profession and nursing students occupational choice , which are included in the nursing students'professional values .Based on the current status , the author proposed some suggestions: emphasizing on curriculum and teaching content reform , strengthening the guiding role of the teachers;cultivating professional val-ues in practice; improving evaluation system; implementing sectional training plan , etc.In addition, the values education in nursing students should make efforts at national , hospital and school levels .

ObjectiveTo observe the effcacy of isoflurane supplemented with ropivacaine for sacral block in indirect inguinal hernia.Methods120 cases of children who were going to be operated in inguinal hernia repairs were randomly divided into isoflurane group( A),ropivacaine group( B ),and isoflurane supplemented with ropivacaine group(C).Sacral block was performed after induction with different anesthetics.Haemodynamics( MAP、HR 、SpO2 ) in three groups were compared,and anesthesia effect,waking time,drug dosage and adverse reactions were analyzed.ResultsHaemodynamics in isoflurane supplemented with ropivacaine group were more stable than the other two groups,and anesthesia effect was better than isoflurane group and ropivacaine group( all P ＜0.05).Moreover,waking time,drug dosage and adverse reactions in group C were statistical differently conpared with controls( all P ＜ 0.05 ).ConclusionIsoflurane supplemented with ropivacaine for sacral block was helpful for respiration and circulation management applied in indirect inguinal hernia and could be a perfect anesthetic methods.

Objective To discuss the influence of clean-up frequency of the operative cavity on the curative effect after endoscopic sinus surgery.Methods 368 patients with sinusitis or nasal polyps were randomly divided into observation group and control group,184 patients in each group.Control group was treated with operative cavity cleaning in moderate frequency,while observation group in intensive frequency.Results The obvious effective rate of observation group was 80.98％,which was significantly higher than that of control group(69.02％) (x2 =12.468,P ＜0.05).The ineffective rate of observation group was 2.17％,which was significantly lower than that of control group (9.78％) (x2 =15.717,P ＜ 0.05).The recurrence rate of observation group was 11.96％,which was significantly lower than that of control group (26.09％) (x2 =9.361,P ＜ 0.05).Conclusion The clean-up frequency of the operative cavity after endoscopic sinus surgery can influence curative effect,moderate clean-up frequency can significantly improve the treatment effects and deserved promotion.

Objective To explore the value of ultrasound on the early bone erosion of finger joint in patients with rheumatoid arthritis (RA).Methods Sixty-three cases of RA patients (patients group) with 486 finger joints was examined by high-frequency ultrasound,X-ray films and MRI,and compared with 20 controls (control group).Results The ultrasound results were significant difference between two groups (P＜0.01).The positive rate was 84.2％(409/486) in high-frequency ultrasound,and 56.2％(273/486) in X-ray films,there was significant difference between the two (P ＜ 0.05 ).The positive rate by high-frequency ultrasound was 63.8％ (136/213) in X-ray check-negative patients,and 68.1％ (145/213) by MRI.The results of the MRI contrast sensitivity of 97.6％,specificity of 75％,accuracy of 96.5％ by high-frequency ultrasound.Conclusion The high-frequency ultrasound on the X-ray check-negative patients with rheumatoid hand early joint bone erosion have some diagnostic value.

Type 2 Diabetes is the consequence of the disturbances of both α- and β-cell secretions.Glucagon-like peptide-1 ( GLP-1 ),which regulates the function of alpha and beta cells,has led to the emergence of a new class of oral anti-diabetic drugs.DPP-4 inhibitors,which increase the concentration of GLP-1 and consequently improve HbAlC,have become a choice for patients in different stages of diabetes.

The adenosine triphosphate-binding cassette subfamily member 4 (ABCB4) gene encodes multidrug resistance rotein 3 (MDR3),which is expressed on the cannalicular membranes of hepatocytes and translocates major phospholipids from the inner to the outer leaflet.Phospholipids are the major carrier and solvent of cholesterol,and in combination with bile salts form mixed micelles.Defects in ABCB4 function cause a low phospholipid content in bile,resulting in cholesterol supersaturation and crystal formation.Low phospholipid-associated cholelithiasis (LPAC) is characterized by the association of ABCB4 mutations and a low biliary phospholipid concentration,resulting in symptomatic gallstones starting before age 40 years,a high serum gamma glutamyl transferase (γ-GT) activity,intrahepatic microlithiasis,and recurrent biliary symptoms despite cholecystectomy.LPAC is an autosomal recessive condition caused by a rare single-gene mutation,commonly occurring in ABCB4,and can include homozygous and heterozygous point mutations in introns,coding exons,and 5 UTR regions.

Objective To study the clinical application of 3-dimensional arterial spin labeling technology (3D-ASL) in brain tumors.Methods Twenty patients with the pathological diagnosis of brain tumors were selected in this study,with low grade glioma in 4 cases,the high grade glioma in 2 cases,lymphoma in 1 case,metastatic tumor in 7 cases,meningioma in 6 cases.All patients were appLIed preoperative 3D-ASL and dynamic contrast-enhanced perfusion magnetic sensitive (DSC) MR imaging line two methods,to analyze the value of 3D-ASL in brain tumors.Results 3D-ASL examination lesions in patients with brain tumors might be displayed in high or low perfusion; 3D-ASL and DSC were obtained from tumor tissue blood supply,the local relative cerebral blood flow (rCBF),there was no significant difference (P ＞ 0.05).The high grade glioma in 3D-ASL image showed a high perfusion,rCBF was 3.0 ± 1.3; Low grade gliomas showed low perfusion,rCBF was 0.6 ± 0.2,the rCBF between the high-and low-grade gliomas was significantly different (P ＜ 0.01).Metastatic tumor 3D-ASL showed ring high perfusion,central necrosis and edema area of low perfusion.Lymphoma 3D-ASL showed slightly higher perfusion.Meningioma showed high perfusion,and highest rCBF,3.5 ± 1.9.Conclusions 3D-ASL in the diagnosis of brain tumors,has high repeatability,non-invasive,without contrast agent.3D-ASL can be further developed into the brain blood flow dynamics of conventional evaluation methods,and can be used for brain tumors level assessment,has broad application prospects.

With Chira's proposal of building an innovative country and implementing national intellectual property strategy,the rapid development of intellectual property,reward system of science and technology had a profound effect.This article made preliminary discussion from the level of scientific and technological achievements,the evaluation system and the types of science and technology rewards.

Objective To explore the impact of health education on negative mood,social support and life quality of patients with breast cancer.Methods 90 patients with breast cancer receiving chemotherapy were divided into the observation group and the control group randomly,and each group with 45.The regular health education was given to the control group,and personalized health education was provided to the observation group and their related family member,the measures included mental communication,psychological counseling and life guidance.SAS,SDS,SSRS and QOL were carried out at two time points:the time when admission to hospital and 4 weeks after admission.Results Before health education,there were no statistical significance between the observation group and the control group on anxiety,depression,social support and life quality.After health education,the observation group was better than the control group in scores of anxiety,depression,social support and life quality.Conclusions The health education given simultaneously to the patients and their family members can improve their negative mood,increase their social support,and improve their life quality.