OBJECTIVETo explore a simple but novel method of strengthening gypsum material by cyanoacrylate infiltration. To evaluate the influence of cyanoacrylate on the mechanical properties of dental gypsum models.

METHODSGypsum specimens were polished to the dimension of 35 mmx4 mmx4 mm. Butyl-cyanoacrylate was diluted with chloroform at different concentrations, namely 20% and 30% cyanoacrylate. Gypsum specimens were infiltrated by diluting one component of cyanoacrylate at different concentrations for 8 h and then dried for analysis. The changes in elastic modulus, fracture toughness, compressive strength, biaxial strength, brinell hardness were measured. The data were analyzed using software OriginPro 8.

RESULTSThe viscosity measurements indicated that diluted cyanoacrylate were Newtonian fluids and the viscosity increased slightly within the 48 hours of preparation but still similar as water at room temperature, which could be used to infiltrating gypsum. The gypsum infiltrated with cyanoacrylate exhibited good physicochemical properties. The biaxial strength, fracture toughness, compressive strength and brinell hardness of the gypsum were improved by 39%, 30%, 63% and 18%, respectively.

CONCLUSIONCyanoacrylate can significantly improve the strength of gypsum model which indicates the potential clinical application.

Objective To explore the protective effect of vitamin E on the rabbit bladder after partial outlet obstruction artificially setup. Methods A total of 28 New Zealand white male rabbits were divided into 4 groups (group A in 6,group B in 6,group C in 8 and group D in 8).Group A,B and C were fed a regular diet,and group D were placed on a diet enriched with 600 mg vitamin E.After 4 weeks partial outlet obstruction was created in groups C and D,while group B underwent sham operation. After 4 weeks of obstruction each rabbit was sedated and cystometry was repeated.After cystometry the bladder was weighed.The gene expression of sarcoplasmic endoplasmic reticulum,calcium,magnesium,adenosine triphosphatase (SERCA2) in bladder was detected by using RT-PCR assay,while the protein level of SERCA2 was measured by Western blot analysis. Results All parameters measured were approximately identical in nomal rabbits(Group A) and shum operation rabbits(group B).Thus,these 2 groups were combined as the control group(Group A and B).Partial outlet obstruction resulted in bladder weight increased significantly in obstructed groups given vehicle group C(13.07?1.71)g and those vitamin E group D(11.80?2.01)g,4-fold higher than in the control group (2.81?0.30)g(P

Objective:To explore the correlation betWeen deceleration capacity of heart rate (DC)and heart rate var-iability (HRV)in patients With essential hypertension (EH)complicated coronary heart disease (CHD).Methods:DC and HRV Were monitored in 81 patients With EH + CHD (EH + CHD group)and 80 healthy volunteers (healthy control group)respectively.Results:Compared With healthy control group,there Were significant decrease in DC [(11.99±4.93)ms vs.(6.62±1.83)ms],standard deviation of normal to normal RR intervals calculated o-ver the 24 h period [SDNN,(129.94±15.22)ms vs.(63.66±12.13)ms],root-mean square of differences be-tWeen successive normal to normal intervals [rMSSD,(55.52±9.03)ms vs.(28.25±8.81)ms]and adjacent nor-mal RR interval difference > 50ms stroke accounted for a percentage of 24h total RR interval [PNN50,(13.99± 5.63)% vs.(7.29±1.11)%]of HRV in EH + CHD group,P <0.05 all;Pearson correlation analysis indicated that DC Was positively correlatedWith SDNN,rMSSD and PNN50 in EH+CHD patients (r =0.571,0.662,0.763, P <0.05 all).Conclusion:There is positive correlation betWeen deceleration capacity of heart rate and heart rate variability in patients With hypertension complicated coronary heart disease,Which can be jointly used as evidence for diagnosis and treatment.

In this study, we use pot experiment to evaluate the effect of plant growth regulator on plant morphology and biomass allocation of Salvia miltiorrhiza. Different concentrations of uniconazole were supplied to S. miltioohiza by means of foliar spray. Height, breadth and stem diameter were measured dynamically, the biomass of leaf, stem, flower and fruit, root biomass and biomass ratio were also examined at the harvest time. Owing to the treatment, plant morphology showed significant changes, the height had been greatly reduced and the breadth decreased largely. Meanwhile, the biomass allocation changed too. The biomass ratio of leaf and stem had been notably reduced while the biomass ratio of root had been increased remarkably. It appears that foliar application of uniconazole during vigorous growth period in S. miltioohiza has dramatic effect on dwarfing plant and improving resistant to lodging. This measure could also be applied to condensed cultivation of S. miltioohiza to increase production.
Biomass ; Plant Growth Regulators ; pharmacology ; Plant Leaves ; drug effects ; growth & development ; Plant Roots ; drug effects ; growth & development ; Plant Stems ; drug effects ; growth & development ; Salvia miltiorrhiza ; drug effects ; growth & development ; Triazoles ; pharmacology

Objective To explore a highly sensitive and highly specific method to detect the serum MG7 antigen (Ag) level for early gastric cancer diagnosis.Methods The serum MG7-Ag level was detected by enzyme-linked immunosorbent assay (ELISA) method in 116 preoperative gastric cancer patients,63 postoperative gastric cancer patients,41 patients with precancerous lesion,37 patients with precancerous diseases,50 healthy individuals and 281 patients with other cancers.Meanwhile,the expression of MG7-Ag was also examined with immunohistochemistry in patients with gastric cancer or precancerous lesion.Chi-square test was used for comparing positive rates of the two detection methods.Results The positive rate of MG7-Ag determined by ELISA was 83.6％(97/116) of preoperative gastric cancer patients,45.2％(28/62) of lung cancer patients,45.5％(20/44) of rectal cancer patients,17.6％ (12/68) of colonic cancer patients,14.2％ (6/42) of breast cancer patients,47.6％ (30/63) of postoperative gastric cancer patients,19.5 ％ (8/4 1) of patients with precancerous lesions,5.4 ％ (2/37) of patients with precancerous diseases and 0 of healthy individuals.The sensitivity of ELISA (83.6 ％) was similar with that of immunohistochemistry (94.0％)(P＞0.05).However,the false positive rate of ELISA (12.8 ％) was lower than that of immunohistochemistry (51.3 ％) (x2 =26.491,P＜0.01).There was statistically significant difference in MG7 Ag expression in gastric cancer with different clinical stages (x2=15.564,P＜0.01).Conclusion This ELISA method might be a non-invasive screening method for population with high risk of gastric cancer.

Objective To investigate the dynamic changes of serum interleukin(IL)-18,IL-1β and copeptin in acute cerebral infarction(ACI),and analyze the relationship with the serious degree of ACI.Methods The levels of serum IL-18,IL-1β and copeptin were measured by Double-antibody sanduicb enzyme-linked immunosorbent assay(ELISA)in 83 patients with ACI who were admitted to the hospital within 24 h,and neurological impairment were evaluated by European stroke scale(ESS)at the 1st,3rd and 7th day respectively after hospitalization.At the same time,the patients with ACI were compared with 32 normal adults.Results The levels of serum IL-18,IL-1β and copeptin at the 1st,3rd and 7th day after hospitalization were(131.30±31.62),(168.30±28.12),(141.26±24.23)ng/L,(0.35±0.04),(0.82±0.10),(0.52±0.21)μ g/L,and(3.64±0.26),(4.18±0.53),(3.26±2.41)μ g/L respectively.There were significant differences among different times respectively(P＜0.05),furthermore they were higher than those in normal adults[(119.12±27.42)ng/L,(0.21±0.08)μ g/L,(2.63±0.23)μ g/L](P＜0.05).Univariate Logistic regression analysis showed that age,copeptin,IL-18,IL-1β and ESS score was the influencing factor in the serious degree of ACI.There was no significant difference in assessing the serious degree of ACI by receiver operating characteristic(ROC)curve between IL-18 and age,copeptin,IL-1 β,ESS score(P＞0.05).Conclusions The serum levels of IL-18,IL-1β and copeptin are increasing after ACI,indicating that the inflammatory and immune factors may be involved in the development process of ACI.The serum levels of IL-18,IL-1β and copeptin can reflect the serious degree of ACI.

Objective:To explore the central neurobiological mechanisms of pleasure effect on rats with neuralgia treated by tuina manipulations of An-pressing and Rou-kneading Huantiao (GB 30).Methods:A total of 64 male Sprague-Dawley (SD) rats were used in this study.Eighteen rats were randomly selected as a normal group,and the other 46 rats were used to duplicate the chronic constriction injury (CCI) model.Ten rats failed in modeling and 36 rats succeeded.These 36 rats were then randomly divided into a model group and a tuina group,with 18 rats in each group.The rats in the normal group and the model group did not receive any interventions,while those in the tuina group received An-pressing and Rou-kneading Huantiao (GB 30),1 min for each time,once a day,3 weeks in total.Heating tests were evaluated to observe the change of pain-sensitivity score before intervention,1 week after intervention,2 weeks after intervention,and 3 weeks after intervention.After 1 week of intervention,2 weeks of intervention,and 3 weeks of intervention,6 rats were randomly selected from each group respectively for brain extraction.The change of Nissl's body and β-endorphin in the accumbens nucleus as well as amygdaloid nucleus of pleasure circuits,and pro-opiomelanocortin (POMC) in the arcuate nucleus were analyzed by methods of histochemistry and molecular biology.Results:After modeling,the pain-sensitivity scores of the tuina group and the model group were statistically different from the score of the normal group (both P＜0.05).After An-pressing and Rou-kneading Huantiao (GB 30) for one week,the pain-sensitivity score of the tuina group had statistical difference compared with that of the model group (P＜0.05).At each different time point:the amounts of Nissl's body in accumbens nucleus and amygdaloid nucleus of the tuina group were significantly more than those of the model group (all P＜0.01).Besides,the numbers of β-endorphin immunoreactive cells in the accumbens nucleus and amygdaloid nucleus of the rats in the tuina group were significantly higher than those in the model group (all P＜0.01),and so was the expression of POMC in arcuate nucleus (all P＜0.01).Conclusion:An-pressing and Rou-kneading Huantiao (GB 30),where the sciatic nerve is ligated,can reduce pain-sensitivity score and increase pain tolerance value of rats with chronic neuralgia.It can increase the activity of neurons in accumbens nucleus and amygdaloid nucleus of pleasure circuits,which indicates that the analgesia effect of tuina therapy may correlate with pleasure effect,and also reveals a part of neurobiological mechanisms of neuralgia.

Objective To screen differentially expressed serum proteins by label-free quantitative proteomics in patients with atopic dermatitis,in order to discover serum protein markers for atopic dermatitis.Methods Serum samples were collected from 6 patients with atopic dermatitis and 6 healthy human controls.Then,the samples from the patients were pooled together,so with those from the controls.Proteins were extracted from the two joint serum samples followed by separation with one-dimensional sodium dodecyl sulfate polyacrylamide gel electropheresis (SDS-PAGE).Peptides were obtained by enzymolysis in protein gels,which were subsequently identified by high performance liquid chromatography tandem mass spectrometry.The Mascot software was used for database searching,and the Scaffold software for relatively quantitative analysis of proteins.Results Totally,76 proteins with a difference of greater than 1.5 folds were identified between the serum samples of patients with atopic dermatitis and controls.There were 50 up-regulated and 26 down-regulated serum proteins in the patients compared with the healthy controls.Among these differentially expressed proteins,26 were only detected in the sera of the patients,and 14 proteins in those of the controls.Conlusion Differences exist in the expression of serum proteins between atopic dermatitis patients and healthy people.

AIM To determine the dynamic changes of monoamine neurotransmitters and their metabolites in various brain regions of cerebral ischemia reperfusion mice. METHODS Concentrations of monoamine neurotransmitters such as norepinephrine (NE), dopamine (DA), serotonin (5-HT) and metabolites were determined by HPLC-ECD on d 0,1,3,5 and d 20 after cerebral ischemia reperfusion by common carotid artery occlusion. RESULTS The cerebral ischemia reperfusion mice showed decreased concentrations of NE, MHPG, DA, DOPAC, 5-HT and 5-HIAA in various brain regions, especially in hippocampus. CONCLUSION Several neuron systems play an important role in neurons damage of cerebral ischemia reperfusion, especially the NE and DA in hippocampus which is sensitive to the ischemia damage. The data offer useful guides for clinical treatments of cerebral ischemia diseases.

Objective To observe the different cerebral activations between pre-administration and post-administration of tryptophan-depleted amino acid mixture (TRP-)/balanced amino acid mixture (BAL) in healthy volunteers through functional magnetic resonance imaging (fMRI) when they received electrical stimulation at the same time. Furthermore, the effects of 5-hydroxytryptamine (5-HT) were explored in pain modulation network. Methods Two-phase crossover design was adopted. Six right-handed healthy volunteers participated in the experiment. TRP- and BAL were administered to each participant according to the Young's method. Volunteers were scanned under fMRI with or without administration of TRP- or BAL when receiving electrical stimulation simultaneously. Analysis of functional neuroimages (AFNI) software was used to show the different activations in the human brain between pre- and post-administration of TRP-/BAL. Then all the results were analyzed by SPSS 14.0. Results (1) Bilateral primary somatosensory cortex (SⅠ) and secondary somatosensory cortex (SⅡ) were activated during pre-administration and post-administration of TRP-, but the activated volumes of bilateral SⅠ and SⅡ during post-administration of TRP- were found significantly larger than that during pre-administration of TRP (P＜0.05). (2) All the activated regions showed no difference between pre- and post-admini-stration of BAL. (3) There were significant differences of pain threshold between pre- and post-admini-stration of TRP- (P＜0.01), which meant that pain threshold reduced remarkably after TRP- administration, while it showed no difference between pre- and post-administration of BAL (P＞0.05). Conclusion 5-HT plays an important role in pain modulation in the central nervous system, TRP- causes acute tryptophan depletion (ATD) through reducing the level of 5-HT in the human brain, which can induce the decrease of volunteers' pain threshold. The activated volumes of bilateral SⅠ and SⅡ display signi-ficant difference between pre- and post-administration of TRP-, suggesting these brain areas may not only involve in the 5-HT related activities but in pain modulation network as well.