1.Optimization of Extraction Technology for Total Saponins of Ardisia Crenata by Singlefactor Experiment Combined with Response Surface Methodology
Herald of Medicine 2014;(8):1080-1082
Objective To optimize the extraction process of Ardisia crenata based on the content of total saponins and to provide a basis for the Ardisia crenata study. Methods Based on the results of the single-factor tests and the Box-Behnken central composite experimental design principles, a response surface methodology which has three factors and three levels was designed to optimize the extraction process of Ardisia crenata based on the content of saponins. Results A maximal extraction yield of total saponins reached 2. 29% under the optimal conditions as follows:70% alcohol was used as extraction solvent with the material to liquid ratio of 116, the extraction time was 3 h at 70 ℃. Conclusion The optimized extraction process is accurate, reliable and practically valuable.
2.Verification of Flow Field Performance of Air Dynamic Wind Tunnel
Journal of Environment and Health 1993;0(03):-
Objective To verify the flow field performance of the air dynamic wind tunnel. Methods The performance of the flow field was evaluated by testing the flow speed of sample-point on the sample-transect of the tunnel. Results Among the flow range of the tunnel, the relative deviations of the speeds of each sample-point on the sample-transect were less than 10%. When the flow rate was set, the relative deviations of the sample-transect average speed in different test period were less than 10%. The ratio of average wind velocity of upper reach to down reach of the tunnel was between 0.92 and 1.03. Conclusion The flow field of the air dynamic wind tunnel is even, stable and coincident.
3.Animal models of dry age-related macular degeneration
Chinese Journal of Experimental Ophthalmology 2013;31(10):983-987
Age-related macular degeneration (AMD) is the leading cause of low vision and blindness in the elder people.Various animal models based on the technology of the genetics are established recently in researches on this disease to investigate its pathogenesis or mechanisms.This article reviews different experimental genetic murine models of AMD used in recent studies.
4.Analysis of Bacterial Culture of Aqueous Vitreous in Eorly Stage of Intraocular Foreign Bodies
Chinese Journal of Nosocomiology 2006;0(07):-
OBJECTIVE To analyse the bacterial culture of aqueous vitreous as well as their sensitivity to antibiotics in intraocular foreign bodies(IOFB).METHODS Bacterial culture of aqueous vitreous as well as their sensitivity to antibiotics were taken at 32 cases(32 eyes) of IOFBs with in 24 hours.And the results were analyzed.RESULTS 21 cases with bacterial culture of aqueous vitreous were found to be positive with bacterial infection.Staphylococcus epidermidis was the most frequently bacteria and identified in 15 cases,which accounted for 71.4% of these 21 cases.All the identified bacteria were sensitive to Ofloxacin,Ciprofloxacin and Cefoperazone,and partly sensitive to Gentamycin and Tobramycin.All of them were resistant to Chlororamphenicol and Rifapine.The occurrence of positive bacterial identification of unmetal foreign bodies were significantly higher than that of metal foreign bodies(?2=4.631,P=0.029).There was no significomt difference between.The location of penetrating eye trauma or lens rupture in the bacterial positive rate identification(?2=2.398,P=0.122;?2=0.327,P=0.568).CONCLUSIONS In patients with IOFB,the major bacteria entering into the eye was Staphylococcus epidermidis.As for prophylactic antibiotics,Quinolones and Cefoperazone can be used as the first line antibiotics.
5.The causes and countermeasures of non-response to anti-vascular endothelial growth factor therapy
Chinese Journal of Ocular Fundus Diseases 2016;32(4):444-448
The therapeutic response of anti-vascular endothelial growth factor (VEGF) differs among individuals.According to the changes of central retinal thickness,intraretinal fluid,subretinal fluid,best corrected visual acuity and other morphological or functional manifestations after treatment,the performance of the treated eyes can be classified as optimal response,poor response and non-response.A variety of factors could account for poor or non-response to anti-VEGF,such as genomic polymorphism and specific genomic risk alleles,lesion characteristics,vitreous and macular structural abnormalities,resistance to anti-VEGF drug,and the role of pericytes and others.The common counter measures include increasing the dosage,shortening the injection interval and replacing with another alternative drug,inhibition of pericytes,relieving vitreomacular anatomical abnormalities.It is still worthy of further exploration that how to assess individual reasons for non-response,so that we can give proper treatment to reduce the excessive use of anti-VEGF drugs and improve the clinical management of ocular neovascularization diseases.
7.Regulatory T lymphocytes and ischemic stroke
Xiang CHEN ; Dan YE ; Yun XUN
International Journal of Cerebrovascular Diseases 2013;21(12):933-937
Stroke is a cerebrovascular disease type with high morbidity and mortality,of which ischemic stroke accounts for about 80%.Now,it is believed that the inflammatory mechanisms play an important role in the progress of pathological physiology of ischemic stroke.Peripheral T lymphocytes infiltrate to the damaged area within 24 hours after cerebral ischemia and are involved in the advance of inflammatory process of brain tissue.As a subtype of T lymphocytes,regulatory T cells are mainly located in the ischemic penumbra; however,at present,its role in ischemic brain injury remains controversial.The research on the mechanisms of regulatory T cells in ischemic stroke may contribute to further understanding of the pathogenesis of ischemic stroke and find new therapeutic targets.
8.The expression level of serum Golgi protein-73 in primary hepatocellular carcinoma and its clinical value in making early diagnosis
Haibo CHEN ; Yuming GU ; Xun WANG
Journal of Interventional Radiology 2014;(6):528-531
Objective To investigate the expression level of serum Golgi protein-73 (GP73) in patients with primary hepatocellular carcinoma (HCC), or accompanied with Budd-Chiari syndrome (BCS), and to discuss its clinical value in making early diagnosis. Methods The peripheral serum samples were collected in 490 individuals, including patients with HCC (n = 65), cholangiocarcinoma (CC, n = 35), Budd-Chiari syndrome accompanied with HCC (n = 40), type B virus hepatitis (n = 60), cirrhosis after B hepatitis (n = 60), Budd-Chiari syndrome complicated by cirrhosis (n = 60), other malignant lesions (n =50), benign hepatic lesions (n = 60) and healthy volunteers (n = 60). The expression levels of serum GP73 and AFP were determined by using Elisa and electrochemiluminescence methods separately. Results The expression level of serum GP73 in the patients with HCC , CC or BCS plus HCC were significantly higher than that in the other individuals (P < 0.05). The area under the receiver operating characteristic curve (ROC), the sensitivity, the specificity and the diagnostic accuracy of GP73 and AFP for HCC were 0.868, 90.8%, 75.5%, 77.6% and 0.739, 60%, 83.2%, 80.2% respectively. The cut-off values of GP73 and AFP were 43.40 ng/ml and 20ng/ml respectively. The area under ROC and the sensitivity of GP73 for the diagnosis of HCC were strikingly higher than those of AFP (P < 0.05), while no significant differences in the specificity and diagnostic accuracy existed between GP73 and AFP (P > 0.05). The area under ROC, sensitivity, specificity and the accuracy of GP73 for the diagnosis of CC were 0.774 , 88.6%, 72.7% and 73.9%respectively, and the optimal cut-off value was 45.40 ng/ml. Conclusion In diagnosing HCC, the expression level of serum GP73 is superior to AFP. It is hopeful that serum GP73 may be proved to be an early serum tumor marker for HCC.
9.Quality of life in adults with epilepsy
Weiwei WANG ; Jing CHEN ; Xun WU
Chinese Journal of Neurology 2001;0(03):-
Objective To evaluate the quality of life (QOL) in adults with epilepsy.Methods The QOLIE-31 and the SDS were administered to 33 adults with epilepsy who met the entry criteria, and 17 healthy volunteers who had the similar personal characters. Results Patients' scores of SDS were adversely associated with seven of the eight QOL domains (except for medication effect) independent of other factors. Duration of the disease was the independent risk factor to overall health and medication effect. The GTC group (17 subjects) and the CPS group (16 subjects) were both obviously compared with the control group in medication effect (GTC group 61.0?23.8,CPS group 56.6?19.4,control 100.0?0.0) and seizure worry domains ( P
10.STUDY OF BEAT TO BEAT SURFACE RECORDING OF HIS BUNDLE ACTIVITY WITHOUT AVERAGING IN MAN
Xun CHEN ; Yuling YE ; Sheng YANG
Medical Journal of Chinese People's Liberation Army 2001;0(09):-
Objective To investigate the application of open beat to beat techniques recording His bundle activity without digital averaging. Methods Recording was performed with very low noise, high gain amplifiers and by analog filtering. 3 brigade amplifiers and 16 bite A/D were connected to a microcomputer by USB. The signal was processed by A pattern recognition plus digital filtering software. The subjects were in a supine position during the recording. Results A prominent waveform was observed between the atrial and ventricular complexes and corresponded to His bundle activity in 46 volunteers. Recordings in 8 patients were compared with records obtained by intracardiac electrode, and a good conformation was seen. Conclusion The noninvasive method of beat to beat surface recording of His bundle activity has broad clinical applicability and high utility for the patients with latent A-V block and eletrophysiologic study.