Objactive:To study the color changes of SY-1 silicone elastomer before and after polymerization.Methods:L*a*b*color parameters of 10 samples of SY-1 silicone elastomer were measured with Minolta chroma-ticity instrument(CS-321) before and after polymerization.The color difference(△E) between precure and post-cure was calculated as△E =[(△L)2+(△a)2+(△b)2]1/2.Results:After polymerization L*and a*valueswere increased(P

Objective: To find out the infinity optical thickness of SY-1 silicone elastomers when color difference(△E) is equal to 1.5 . Methods: Silicone elastomer samples with thickness from 0.5 mm to 10 mm of SY-1 silicone elastomer were measured by CIE-1976-L *a *b * relative to CIE source against a white and a black background by using Minolta colorimeter . Color difference was calculated as △E=[(△L *) 2+( △a *) 2+(△b *) 2] 1/2 . The infinity optical thickness of SY-1 silicone elastomer when △E=1.5 was calculated by regression formulation. Result: When △E was equal to 1.5, the infinity optical thickness of SY-1 silicone elastomer was 7.60 mm. Conclusion: In order to get ideal effect the supports should be treated with colorant when the thickness of silicone elastomer covering the surface of supports in maxillofacial prostheses is thinner than 7.60 mm.

OBJECTIVE:To effectively control the quality of intravenous infusion product of antitumor drugs in PIVAS,and to guarantee the safety of clinical drug use. METHODS:According to the operation flow of intravenous infusion product,the quality control of anti-tumor drugs was conducted in PIVAS of our hospital from three aspects,i.e. before,during and after admixture. The improvement effect was compared before and after the implementation. RESULTS:Pre-admixture management was carried out through special classification management and medical order check management for antitumor drug;intra-admixture management was carried out through the management of admixture environment,solvent selection,admixture method,order for adding drug, dosage;post-admixture management was carried out through standard examination of infusion product and the management of deliv-ery time and condition. 5 months later,the times of communication between PIVAS and clinical departments was decreased from 30 times to 10 times,and the incidence of infusion product was decreased from 0.68% to 0.18%. CONCLUSIONS:Standard man-agement has been conducted for operation procedure of anti-tumor drugs before,during and after admixture. The quality of intrave-nous infusion product of antitumor drugs can be effectively controlled to ensure the safety of clinical drug use.

Objective To investigate the effects of inhaling isoflurane and enflurane on the spontaneous neural discharge of the neurones in rat hippocampus. Methods Whole cell patchclamp recording te chnique was used to observe the effects of isoflurane and enflurane on the spont aneous discharge rate of the neurons in the hippocampus on the brain slice of ne w-born SD rats. After decapitation, the whole brain of the rat was removed and put into artificial cerebrospinal fluid (ACSF) saturated with 1.36 g?L -1 O 2 and 0.098 g?L -1 CO 2 mixed gas at 4 ℃ . Brain was cut into 300～400 ? m thick slices containing the hippocampus. Whole cell patchc lamp recording technique was used to observe the effects of isoflurane with dif ferent concentrations on the spontaneous discharge rate of neurons in the hippoc ampus on the brain slices. Results Isoflurane and enfluran e could significantly inhibit the spontaneous neural discharge of neurons in the hippocampus in a dose-dependant manner. The effects of spontaneous neural disc harge of hippocampus inhibited by isoflurane (0.12 g?L -1 ～0.36 g?L -1 ) and enflurane (0.2 g?L -1 ～0.6 g?L -1 ) could be recove red following washing off with ACSF for 5 min. Conclusion T he spontaneous discharge rate of neurons in the hippocampus can be reversibly in hibited by isoflurane and enflurane. Hippocampus may be an important action site of anesthetics isoflurane and enflurane in the central nervous system.

Objective: To evaluate the corrosion resistance of Ni-Cr alloy with different coatings in neutral and acid saliva by electrochemistry method. Methods: Measured the self-corrosion potential (Ecorr) and polarization resistance(Rp) curves of Ni-Cr alloy models with different coatings in neutral and acid artificial salivas. Results: The Ecorr of the Ni-Cr alloys all showed positive values, the electrochemistry corrosion and galvanic corrosion were not detected. Conclusion: Ni-Cr alloy with titanium nitride coating, gold electroplating coating, gold-paste layer and gold-porcelain blended layer have both anti-corrosion and esthetical function without changing its own property.

Objective To evaluate the effects of acitretin combined with clarithromycin on tumor growth in human oral epidermoid carcinoma xenografts in nude mice,and to investigate their antitumor mechanisms.Methods A cell line of human oral epidermoid carcinoma was subcutaneously inoculated into 31 Balb/c nude mice to establish a xenograft model of human skin tumor.Then,the nude mice were randomly classified into 6 groups according to a double blind protocol:control group (n =6) remaining untreated,placebo group (n =5) treated with wheat flour,acitretin group (n =5) treated with acitretin 7.2 mg/kg per day,clarithromycin group (n =5) treated with clarithromycin 100 mg/kg per day,acitretin + placebo group (n =5) treated with both acitretin (7.2 mg/kg per day) and wheat flour,and acitretin + clarithromycin group (n =5) treated with acitretin (7.2 mg/kg per day) and clarithromycin 100 mg/kg per day.All the drugs were intragastrically administrated once daily.After three weeks of treatment,mice were sacrificed and xenografts were removed.Then,the size and weight of xenografts were measured,and pathological analysis was conducted.Real time-PCR was performed to quantify the mRNA expressions of vascular endothelial growth factor (VEGF) and nuclear factor (NF)-κB,and immunohistochemistry was carried out to observe the expression of VEGF as well as to determine microvessel density (MVD) and Ki-67 proliferation index.By using the software SPSS 19.0,analysis of variance was performed for comparison of measurement data,and least significant difference (LSD) test for paired comparisons.Results Both the size and weight of xenografts in the acitretin + clarithromycin group were significantly lower than those in the other groups (all P ＜ 0.05).Real-time fluorescence-based PCR revealed weaker mRNA expressions of VEGF and NF-κB in the acitretin + clarithromycin group compared with the control group,clarithromycin group and acitretin group (all P ＜ 0.05).As immunohistochemistry showed,the acitretin + clarithromycin group displayed a decrease in the expression rate (all P ＜ 0.01) and staining intensity of VEGF,MVD (all P ＜ 0.01) with a sparse distribution of microvessels,Ki-67 proliferation index (all P ＜ 0.05) and proliferative activity of tumor cells compared with the control group,clarithromycin group and acitretin group.Conclusion Acitretin combined with clarithromycin can synergistically inhibit the growth of human oral epidermoid carcinoma xenografts in nude mice,downregulate VEGF expression,and suppress angiogenesis and tumor proliferation.

Bilingual teaching is an novelty in neurosurgical teaching, and this article summarizes the authors' four-year experience on neurosurgical blingual teaching, also involving the problems they met and the ways to resolve them.

AIM: To preliminarily study the molecular mechanism for the cardiac injury in rat by adriamycin and the mechanism for the acute repair in the body. METHODS: The male Sprague Dawley rats were randomly divided into four groups (n=10 in each): The first group was kept without treament and served as the control ;the second, the third and the fourth received ADR in different doses (10, 20, 40 mg?kg -1 , respectively) by injection of adriamycin. The content of malondialdehyde (MDA)in the serum was estimated with thiobarbituric acid. Cu Zn SOD was measured by its reaction with xanthine oxidase. GSH was measured by its reaction with 5, 5 nitrobenzoic acid. Using semi quantitative reverse transcription polymerase chain reaction (RT PCR),we analyzed the expression of the associated gene. RESULTS: MDA contents in the medium and high ADR dose groups were higher than that in the control group (P

Objective To investigate the relationship between the total burden of cerebral small vessel disease (CSVD) and the outcomes in patients with large artery atherosclerotic (LAA) stroke.Methods From June 2016 to January 2018,patients with LAA stroke treated at the Department of Neurology,the Affiliated Hospital of Qingdao University were enrolled retrospectively.The overall burden of CSVD was evaluated according to MRI findings.The National Institute of Health Stroke Scale (NIHSS) was used to evaluate theseverity of stroke.The modified Rankin scale (mRS) was used to evaluate the outcomes at day 90 after the onset.The mRS score 0-2 was defined as good outcome,and ＞2 was defined as poor outcome.Results A total of 148 patients with LAA stroke were enrolled,including good outcome in 72 (48.65％) and poor outcome in 76 (51.35％).There were significant differences in the proportions of hypertension (69.44％ vs.85.52％;x2 =5.519,P =0.019),taking antihypertensive drugs before the onset (48.61％ vs.69.74％;x2 =6.845,P =0.009),white matter hyperintensity (18.06％ vs.39.47％;x2 =8.228,P =0.004),enlarged perivascular space (33.33％ vs.60.53％;x2 =10.968,P =0.001),as well as the baseline NIHSS scores (3.00 [2.00-4.00] vs.7.0 [5.0-10.0];Z =-8.159,P =0.001),baseline systolic blood pressure (149.40± 15.80mmHgvs.157.21± 14.05mmHg;t=3.180,P=0.002;1 mmHg=0.133 kPa),fasting glucose (5.91 ±2.06 mmol/L vs.6.92 ±2.65 mmol/L;t =2.595,P =0.010),and the proportions of total CSVD scores 0,1,2,3,and 4 (Z =-4.927,P =0.001) between the 2 groups.After adjustment for the confounding factors,such as hypertension and fasting glucose,multivariate regression analysis showed that the total CSVD score (odds ratio 4.457,95％ confidence interval 1.768-11.236;P =0.002) and baseline NIHSS score (odds ratio 2.070,95％ confidence interval 1.580-2.710;P ＜ 0.001)were the independent risk factors for the poor outcomes in patients with LAA stroke.Conclusions The total CSVD burden was closely associated with the outcomes in patients with LAA stroke.Higher CSVD total score and baseline NIHSS scores were independently associated with the poor outcome at 90 d in patients with LAA stroke.

ObjectiveTo explore the expression of MRP1 and CD34 in colorectal carcinoma tissue and the relationship with clinicopathological factors.MethodsImmunohistochemical streptavidin-perosidase method was used to examine the expression of MRP1 and CD34 in 53 cases with colorectal carcinoma and normal colorectal tissue.The correlation between the levels of MRP1and CD34 expression and clinicopathological factors were analyzed.ResultsThe positive expression rates of MRP1 in the carcinoma group and normal colorectal tissue group were 49.1％ and 15.1％ respectively,and there was a significant difference of the positive expression between the two groups( x2 =14.029,P ＜ 0.01 ).The expression of MRP1 had no correlation with the degree of differentiation,the depth of invasion,the metastasis of lymph node and all the other clinicopathological factors ( P ＞ 0.05 ).CD34 value in the carcinoma group and normal colorectal tissue group were ( 35.63 ± 12.23 ) MVD/HP and ( 6.12 ± 0.97) MVD/HP,respectively,and there was a significant difference between the two groups (t =17.565,P ＜ 0.01 ).CD34 was not correlated with age,sex,tumor size,localization of the primary tumor ( P ＞ 0.05 ),but correlated with Dukes staging,lymph node metastasis,differentiation of the tumor,depth of invasion( all P ＜ 0.05).ConclusionThe overexpression of MRP1 and CD34 protein may involve in colorectal carcinogenesis;MRP1 may involve in the primary multidrug resistance in colorectal carcinoma.; CD34 may involve in the colorectal carcinoma invasion and metastasis.Investigating the expression of MRP1 and CD34 in colorectal carcinoma simultaneously can provide new referential indexes for the treatment and prognosis of colorectal carcinoma.