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.

To explore the effect of comprehensive management on psychological influence in children with asthma, 60 cases with asthma was administrated by WHO global comprehensive strategy for the management of asthma including the persistent use of beclomethaone with the intermittent inhalation of salbutanmol, the lung function monitored by peak flow meter, the detection and avoidance of the induced factors, the management of the social education and the psychological intervention. All children on comprehensive management were followed one year for observation. The results showed that the rate of the total effect was 98.3%. There were all decrease significantly in the rate of the hospitalization, the rate of the emergency, and the rate of the absence for school. It was obvious that asthmatic children and their parents's confidence for the treatment of asthma enhanced significantly.Their psychological disturbance, the school grade, and the life quality were also obtained advanced improvement.

Numerous studies showed that Helicobacter pylori (HP) infection and gastric cancer have a correlation, which is a important factor to influence the development of gastric cancer, with scholars' intensive research, it is found that the way of HP acting on gastric cancer is complicated and diverse, this review summarizes the role of HP in mechanism, correlation factor and action way of gastric cancer.

Human promyelocytic leukemia HL - 60 cells labelled with 3H - inositol were treated with vincristine (VCR), it was found that the radioactivity of 3H-phosphatidyl inositol - 4-phosphate (PIP) and 3H - Phosphatidyli-nositol - 4,5 - bisphosphate(PIP2) had no obvious change, but that of 3H-phosphatidyl inositol (PI) decreased rapidly, only accounted for 38. 55%~61.01% of the control during 1~ 120 min of the treatment. It showed that VCRdid not affect the activity of PI kinase and PIP kinase, but enhanced the hydrolysis of PI of HL - 60 cells. The inhibitorty effect of VCR upon cell proliferation and DNA synthesis was observed after above biochemical changes,these results suggest that VCR may inhibit HL-60 cells proliferation by interfering the metabolism of phosphoininositides.

Humans ; Photography ; methods ; Surgery, Oral

Humans ; Photography ; methods ; Surgery, Oral

Hepatocellular carcinoma(HCC)has high incidence rate,recurrence rate after surgecal treat-ment,as well as fatality rate in China .HCC is not sensitive to radiotherapy or chemotherapy and no effective treat-ment is available for HCC patients at advanced stage .Sorafenib is the first effective molecularly targeted drug for the treatment of HCC,which represents a milestone in the treatment of HCC .However,it also shows drug resist-ance during clinical application .Therefore,it is important to investigate the mechanism of drug resistance and its molecular markers for HCC .In this review ,we summarize the current status of the studies in these fields .

ObjectiveTo discuss the influence on diagn osing of femoral vein reflux by using the different ultrasound Doppler probing points. MethodsUsing pulse wave(PW) and color Doppler flow imaging, 134 femoral veins in 67 cases of lower limb varicosity were detected at 3 different probing points to check up the deep venous reflux after Valsava maneuver. The ultrasonographic data were compared with the results of venous DSA and operation to analyze the influence on diagnosis. ResultsThe reflux data obtained from the upper point of superficial femoral vein was most correlative with the results of DSA and operation. ConclusionsThe PW is a satisfactory technique in diagnosing the femoral reflux, and the upper point of superficial femoral vein is a most reasonable probing point.

0.05).The AI of tumor cells was(9.7?0.9)% in mice treated with endostatin compared to that (1.9?0.4)% in the group of control ( P

Parkinson's disease (PD) is a common neurodegenerative disorder associated with aging. Great progresses have been made toward understanding the pathogenesis over the past decades. It seems that both genetic factors and environmental factors contribute to PD, while the precise pathogenesis still remains unknown. Recently, increasing evidence has suggested that autophagy dysregulation is closely related to PD. Dysregulation of the autophagic pathways has been observed in the brains of PD patients or in animal models of PD, and a number of PD-associated proteins, such as a-synuclein, Parkin and PINK1, were found to involve in autophagy, suggesting a link between autophagy and pathogenesis of PD. In this review, we summarized the role of PD-associated proteins in autophagy pathways. In addition, we described the efficacy of autophagy-modulating compounds in PD models and discussed promising strategies for PD therapy.