Tobacco polysaccharides were extracted by hot water extraction,and purified and separated using DEAE-52 cellulose chromatography columns,and three purified polysaccharide fractions,YCT-1,YCT-2,and YCT-3,were finally o...Tobacco polysaccharides were extracted by hot water extraction,and purified and separated using DEAE-52 cellulose chromatography columns,and three purified polysaccharide fractions,YCT-1,YCT-2,and YCT-3,were finally obtained.The physicochemical properties of the three fractions were analyzed by ultraviolet spectroscopy,high-performance liquid chromatography and high-performance gel chromatography.The in vitro antioxidant activity of tobacco polysaccharides was compared among different fractions by using DPPH radical,hydroxyl radical scavenging assay and potassium ferricyanide method.The in vitro hypoglycemic activity was compared usingα-amylase andα-glucosidase activity inhibition assay.And the in vitro hypolipidemic activity were investigated by using pancreatic lipase activity inhibition assay and HepG-2 intracellular lipid accumulation assay.All the results showed that the constituent monosaccharides of the three tobacco polysaccharide fractions were similar,but the molar percentages of each monosaccharide were different.The average molecular weights of the three components were 27,727 Da,27,587 Da,and 66,517 Da,respectively,and the scavenging activities on DPPH radicals and hydroxyl radicals were at a high level with good quantitative-effect relationships.The reducing power were much lower than that of the positive control VC,and the three polysaccharide fractions had a weak inhibitory ability onα-amylase activity,but showed excellent inhibitory ability onα-glucosidase and pancreatic lipase activity.In addition,the results of cellular experiments showed that all three fractions were able to inhibit lipid over-accumulation in HepG-2 cells by increasing the mRNA expression levels of PPAR-α,CPT-1A,and CYP7A1 genes,and the tobacco polysaccharide YCT-3 showed the best effect.The mechanism by which YCT-3 ameliorated the over-accumulation of intracellular lipids in HepG-2 cells was found to be related to its influence on the expression of miR-155-3p and miR-17-3p in the exosomes of HepG-2 cells.展开更多
High-alkali species in coal are notorious for causing ash slagging and fouling incidents.In this paper,four high-alkali coals were individually subject to hydrothermal pretreatment(HTP),within a batch-type autoclave a...High-alkali species in coal are notorious for causing ash slagging and fouling incidents.In this paper,four high-alkali coals were individually subject to hydrothermal pretreatment(HTP),within a batch-type autoclave at 300 -C for 1 h,and the treated coals were analyzed,along with the oxygen-containing functional groups determined by Fourier transform infrared spectrometer(FT-IR).Then the alkali species and other components in the coal ash were quantified by X-ray fluorescence(XRF)for evaluating the ash slagging and fouling tendency.Apart from this,FactSage was adopted to simulate the occurrence and transformation of alkali species during coal thermal conversion ending at various temperatures.The findings indicate that the treated coals are superior to the parent ones in terms of certain remarkable changes via HTP.The moisture,oxygen and sulfur of the hydrothermally treated coals decline obviously,while the calorific value rises sharply.HTP could reduce the alkali species to less than 2%(%,by weight,equivalent to Na2O in dry ash),with a maximum removal ratio of 88.9%,lowering the ash slagging and fouling tendency.The proposed mechanism of HTP was that the alkali species in coal matrix became released due to the breakage of the coal functional groups and micropores during HTP.展开更多
There are many advantages of combining incretin therapy[glucagon-like peptide-1(GLP-1)receptor agonists and dipeptidyl peptidase-4(DPP-4)inhibitors]with insulin therapy as a glucose-lowering strategy in type2 diabetes...There are many advantages of combining incretin therapy[glucagon-like peptide-1(GLP-1)receptor agonists and dipeptidyl peptidase-4(DPP-4)inhibitors]with insulin therapy as a glucose-lowering strategy in type2 diabetes.One important advantage is the complementary mode of the mechanistic action of incretin and insulin therapy.Another advantage is the reduction in risk of hypoglycemia and weight gain when adding incretin therapy to insulin.Several clinical trials have studied the addition of GLP-1 receptor agonists[exenatide BID(twice daily),lixisenatide,albiglutide]or DPP-4inhibitors(vildagliptin,sitagliptin,saxagliptin,alogliptin,linagliptin)to ongoing insulin therapy or adding insulin to ongoing therapy with a GLP-1 receptor agonist(liraglutide).These studies show improved glycemia in the presence of limited risk for hypoglycemia and weight gain with the combination of incretin therapy with insulin.This article reviews the background and clinical studies on this combination.展开更多
Whether supplementation of curcuminoids decreases serum adipocyte-fatty acid binding protein（A-FABP） level and whether this decrease benefits glucose control is unclear.One-hundred participants（n=50 administered cu...Whether supplementation of curcuminoids decreases serum adipocyte-fatty acid binding protein（A-FABP） level and whether this decrease benefits glucose control is unclear.One-hundred participants（n=50 administered curcuminoids,n=50 administered placebo） from our previous report on the effect of curcuminoids on type 2 diabetes in a 3-month intervention were assessed for levels of serum A-FABP,oxidative stress,and inflammatory biomarkers.Curcuminoids supplementation led to significant decreases in serum A-FABP,C-reactive protein（CRP）,tumor necrosis factor-α,and interleukin-6 levels.Curcuminoids supplementation also significantly increased serum superoxide dismutase（SOD） activity.The change in serum A-FABP levels showed positive correlations with changes in levels of glucose,free fatty acids（FFAs）,and CRP in subjects supplemented with curcuminoids.Further stepwise regression analysis showed that A-FABP was an independent predictor for levels of FFAs,SOD,and CRP.These results suggest that curcuminoids may exert anti-diabetic effects,at least in part,by reductions in serum A-FABP level.A-FABP reduction is associated with improved metabolic parameters in human type 2 diabetes.展开更多
Objective Assessment of the comprehensive relationship among apolipoprotein CIII（apoCⅢ） levels, inflammation, and metabolic disorders is rare. Methods A total of 1455 consecutive patients not treated with lipid-low...Objective Assessment of the comprehensive relationship among apolipoprotein CIII（apoCⅢ） levels, inflammation, and metabolic disorders is rare. Methods A total of 1455 consecutive patients not treated with lipid-lowering drugs and undergoing coronary angiography were enrolled in this cross-sectional study. A mediation analysis was used to detect the underlying role of apoCⅢ in the association of inflammation with metabolic syndrome（MetS）. Results Patients with MetS showed higher levels of apoCⅢ [95.1（73.1-131.4） vs. 81.7（58.6-112.4） μg/mL, P 〈 0.001] and inflammatory markers [high sensitivity C-reactive protein, 1.7（0.8-3.4） vs. 1.1（0.5-2.2） mg/L; white blood cell count,（6.48 ± 1.68） vs.（6.11 ± 1.67） × 10~9/L]. The levels of apoCⅢ and inflammatory markers increased with the number of metabolic risk components（all P 〈 0.001）. Furthermore, apoCⅢ levels were associated with virtually all individual MetS risk factors and inflammatory markers（all P 〈 0.05）. Importantly, the prevalence of MetS in each metabolic disorder rose as apoCⅢ levels increased（all P 〈 0.05）. Mediation analysis showed that apoCⅢ partially mediated the effect of inflammation on MetS independently from triglycerides. Conclusion Plasma apoCⅢ levels were significantly associated with the development and severity of MetS, and a role of apoCⅢ in the effect of inflammation on the development of MetS was identified.展开更多
In this paper,the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and achieved.Combined with cavity-enhanced absorption spectroscopy,the noninvasive detection of H_2 wit...In this paper,the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and achieved.Combined with cavity-enhanced absorption spectroscopy,the noninvasive detection of H_2 with a prepared concentration of 500 ppm in multiple dissolved gases is performed and evaluated.The high frequency selectivity of 0.0051 cm^-1 at an acquisition time of 1 s allows the sensitive detection of the（1-0） S（l） band of H_2 with a high accuracy of（96.53±0.29）%and shows that the detection limit to an absorption line of 4712.9046 cm^-1 is approximately（17.26±0.63） ppm at an atmospheric pressure and a temperature of 20 ℃.展开更多
The fringing-induced barrier lowering（FIBL） effect of sub-100 nm MOSFETs with high-k gate dielectrics is investigated using a two-dimensional device simulator.An equivalent capacitance theory is proposed to explain ...The fringing-induced barrier lowering（FIBL） effect of sub-100 nm MOSFETs with high-k gate dielectrics is investigated using a two-dimensional device simulator.An equivalent capacitance theory is proposed to explain the physics mechanism of the FIBL effect.The FIBL effect is enhanced and the short channel performance is degraded with increasing capacitance.Based on equivalent capacitance theory,the influences of channel length,junction depth,gate/lightly doped drain（LDD） overlap length,spacer material and spacer width on FIBL is thoroughly investigated.A stack gate dielectric is presented to suppress the FIBL effect.展开更多
Preliminary tests in rats have shown that the title complex is an efficient insulin mimic, which may be the first example of polyoxomatalates possessing insulin mimetic activity.
By solving Poisson＇s equation in both semiconductor and gate insulator regions in the cylindrical coordinates, an analytical model for a dual-material surrounding-gate （DMSG） metal-oxide semiconductor field-effect ...By solving Poisson＇s equation in both semiconductor and gate insulator regions in the cylindrical coordinates, an analytical model for a dual-material surrounding-gate （DMSG） metal-oxide semiconductor field-effect transistor （MOSFET） with a high-k gate dielectric has been developed. Using the derived model, the influences of fringing-induced barrier lowering （FIBL） on surface potential, subthreshold current, DIBL, and subthreshold swing are investigated. It is found that for the same equivalent oxide thickness, the gate insulator with high-k dielectric degrades the short-channel performance of the DMSG MOSFET. The accuracy of the analytical model is verified by the good agreement of its results with that obtained from the ISE three-dimensional numerical device simulator.展开更多
A new analytical model to describe the drain-induced barrier lowering （DIBL） effect has been obtained by solving the two-dimensional （2D） Poisson＇s equation for the dual-channel 4H-SiC MESFET （DCFET）. Using thi...A new analytical model to describe the drain-induced barrier lowering （DIBL） effect has been obtained by solving the two-dimensional （2D） Poisson＇s equation for the dual-channel 4H-SiC MESFET （DCFET）. Using this analytical model, we calculate the threshold voltage shift and the sub-threshold slope factor of the DCFET, which characterize the DIBL effect. The results show that they are significantly dependent on the drain bias, gate length as well as the thickness and doping concentration of the two channel layers. Based on this analytical model, the structure parameters of the DCFET have been optimized in order to suppress the DIBL effect and improve the performance.展开更多
The body current lowering effect of 130 nm partially depleted silicon-on-insulator (PDSOI) input/output (I/O) n-type metal-oxide-semiconductor field-effect transistors (NMOSFETs) induced by total-ionizing dose is obse...The body current lowering effect of 130 nm partially depleted silicon-on-insulator (PDSOI) input/output (I/O) n-type metal-oxide-semiconductor field-effect transistors (NMOSFETs) induced by total-ionizing dose is observed and analyzed. The decay tendency of current ratio of body current and drain current I-b/I-d is also investigated. Theoretical analysis and TCAD simulation results indicate that the physical mechanism of body current lowering effect is the reduction of maximum lateral electric field of the pinch-off region induced by the trapped charges in the buried oxide layer (BOX). The positive charges in the BOX layer can counteract the maximum lateral electric field to some extent.展开更多
[Objectives]This study was conducted to discuss the mechanism of the blood sugar-lowering effect of Cyclocarya paliurus extract.[Methods]With C.paliurus leaves as the raw material,the ethyl acetate-butyl acetate micro...[Objectives]This study was conducted to discuss the mechanism of the blood sugar-lowering effect of Cyclocarya paliurus extract.[Methods]With C.paliurus leaves as the raw material,the ethyl acetate-butyl acetate microwave extraction process of C.paliurus was studied.With the yield of C.paliurus extract as an evaluation index,single-factor experiments were carried out on such 6 factors as the dry C.paliurus leaf powder size,solid-to-liquid ratio,extraction time,microwave frequency,microwave power,and microwave extraction time,and the extraction and purification process was further optimized by response surface analysis.The normal mice and the hyperglycemic mice modeled by alloxan were injected with C.paliurus extract to study the blood sugar-lowering effects of different groups of C.paliurus extract.[Results]The optimal process combination for the extraction of C.paliurus leaves was obtained:dry C.paliurus powder size 90-100 mesh,solid-to-liquid ratio 1∶20(g/ml),extraction time 192 min,microwave frequency 2500 MHz,microwave power 490 W,and extraction time 248 s.Under these conditions,the yield of C.paliurus extract reached the maximum,95.10%,reaching 99.83%of the predicted value.The blood sugar-lowering test on mice showed that the C.paliurus extract had a good effect on lowering blood sugar,indicating that C.paliurus extract can improve the free radical scavenging capacity to a certain extent.[Conclusions]This study provides certain reference for the in-depth study of the physiological effects of C.paliurus extract and the comprehensive development and utilization of C.paliurus extract.展开更多
Landscape distribution, macroscopic, microscopic, mineral and geochemical characterizations were conducted on the Doumbouo-Fokoué bauxite ore deposit in order to estimate bauxites potential and its implication to...Landscape distribution, macroscopic, microscopic, mineral and geochemical characterizations were conducted on the Doumbouo-Fokoué bauxite ore deposit in order to estimate bauxites potential and its implication to general lowering of the relief. Fourteen bauxitic plateaus covering a surface area of 5.7 km2 were identified. Bauxitic pedons show deep weathered profiles (10.0 - 12.0 m) with thick bauxitic mantle (4.0 - 8.0 m). Saprolite and pisolith bauxitic facies own high aluminium (47.5% - 49.5% Al2O3), relatively low iron (20.0% - 22.0% Fe2O3) and low silica contents (1.8% - 7.6% SiO2). Gibbsite is the dominant mineral (49% - 68% of minerals detected by X-ray);meanwhile hematite, goethite and kaolinite occur in small amounts. Bauxitization corresponds to intense allitization with abundant accumulation of gibbsite and development of lateritic iron bearing ortho-bauxites. Bauxite ores yielded bauxite reserves of 9.2 million tons. They occur as old and residual bauxitic mantles representing remnants of the Miocene residual lateritic deposits in West Cameroon referring to the African surface of Valeton [1]. Its mean altitude (1532 - 1590 m als) below the African surface reveals general lowering of the relief.展开更多
Objective:To investigate the effect of lipid lowering mixture on blood lipid metabolism, LDL oxidative susceptibility and blood viscosity and coagulation in experimental hyperlipidemia rats.Method: Select 60 male Wist...Objective:To investigate the effect of lipid lowering mixture on blood lipid metabolism, LDL oxidative susceptibility and blood viscosity and coagulation in experimental hyperlipidemia rats.Method: Select 60 male Wistar rats were randomly divided into six groups, ten rats in each group were recorded as low as lipid-lowering mixture, high dose group and simvastatin group, model group and control group. Patients in control group were treated with basic feed for feeding, other groups of rats are used high fat diet were fed to establish hyperlipidemia rat model, in the process of modeling and prophylactically, determination of rats after 10 weeks of lipid metabolism and susceptibility of LDL to oxidation and blood viscosity concentration coagulation state.Result: Antioxidant capacity of the model group rat's serum LDL-C decreased significantly, and simvastatin group and three groups of lipid-lowering mixture group rats serum LDL antioxidant capacity were significantly enhanced;and high lipid mixture, LDL antioxidant ability in middle dose group rats were significantly higher than those of the Jiangzhi Decoction low dose group rats (P<0.05). Lipid mixture of high, middle dose group rats of EET and ETA P, ETA B (high, medium and low shear), IED, HCT, the role of the IEA was significantly higher in Jiangzhi Decoction low dose group rats (P<0.05 or P<0.05).Conclusion:Lipid-lowering mixture on experimental hyperlipidemia rats blood lipid metabolism and blood viscosity concentration coagulation state has a good regulatory role, and lipid-lowering mixture on blood lipid and blood flow abnormalities lipid-lowering mixture can also play a good regulation and therapeutic effect.展开更多
In view of the situation of excavation of should carry out simulation studies for the numerical open coal mine for the underground water disaster, we value of the water lowering project and improve the accuracy and th...In view of the situation of excavation of should carry out simulation studies for the numerical open coal mine for the underground water disaster, we value of the water lowering project and improve the accuracy and the level of the water lowering project. On the basis of the hydrological geological conditions of certain open mine digging, a more reasonable seepage numerical model was built according to MODFLOW. It was simulated in advance that the process of the confined water level descending with the time, and combining with the actual observations to test the correctness of the model. The calculation showed that the results coincided well with the results of actual measurement. Based on this, different water lowering numerical simulations were built for the open coal mine digging. It could be simulated and forecast that the changes of the groundwater level in drainage process within and outside the mine pit, and it was quantitatively assessed that the possible water lowering result of the opencast water drainage process, which provide an important basis for the actual water lowering project and the possible project disposal.展开更多
A new analytical model to describe the drain-induced barrier lowering(DIBL) effect has been obtained by solving the two-dimensional(2D) Poisson’s equation for the dual-channel 4H-SiC MESFET(DCFET).Using this analytic...A new analytical model to describe the drain-induced barrier lowering(DIBL) effect has been obtained by solving the two-dimensional(2D) Poisson’s equation for the dual-channel 4H-SiC MESFET(DCFET).Using this analytical model,we calculate the threshold voltage shift and the sub-threshold slope factor of the DCFET,which characterize the DIBL effect.The results show that they are significantly dependent on the drain bias,gate length as well as the thickness and doping concentration of the two channel layers.Based on this analytical model,the structure parameters of the DCFET have been optimized in order to suppress the DIBL effect and improve the performance.展开更多
Background The incidence of leg edema caused by calcium channel blockers（CCB） is so high, some studies tried combination with angiotension converting enzyme inhibitors（ACEI） or diuretics to overcome this problem.H...Background The incidence of leg edema caused by calcium channel blockers（CCB） is so high, some studies tried combination with angiotension converting enzyme inhibitors（ACEI） or diuretics to overcome this problem.However, there is no comparison about which is better to improve edema at present. Methods This study was designed as a single-center, prospective, randomized, double-blind, parallel-group, clinical trial. 224 hypertensive patients with leg edema after 4 weeks since taking levamlodipine were enrolled, and they were randomly divided into levamlodipine ＋ furosemide（CD） group and levamlodipine ＋ enalapril（CA） group for another 4 weeks. Ankle circumference（AC）, edema score（ES）, blood pressure（BP） and cure rate of leg edema were evaluated. Results Altogether 179 patients（89 in CD group and 90 in CA group） completed the 4-week treatment. After the 4-week therapy with furosemide or enalapril, most subjects were free of edema in either group（96.51% vs.96.67%, P 〉 0.05）. Only 4 in CD group and 3 in CA group had mild edema. Enalapril was more effective than furosemide to reduce AC（10.92 ± 1.84 mm vs. 12.97 ± 2.46 mm, P 〈 0.05）. But for ES, there was no significant difference. And there were no significant differences in antihypertensive effect between them. Uric acid（UA）was increased significantly in CD group（10.70 ± 18.48 μmol/L vs. 0.22 ± 28.13 μmol/L, P 〈 0.05）. Conclusion Enalapril is more effective than furosemide in attenuating lower extremity edema caused by levamlodipine in essential hypertensive population, with equal antihypertensive efficacy and less uric acid increasing.展开更多
Background:Hypertension is a major risk factor for cardiovascular diseases,including AF,which is one of the most common cardiac arrhythmias globally.AF is strongly associated with an increased risk of stroke,heart fai...Background:Hypertension is a major risk factor for cardiovascular diseases,including AF,which is one of the most common cardiac arrhythmias globally.AF is strongly associated with an increased risk of stroke,heart failure(HF),and cardiovascular mortality.Although intensive blood pressure lowering has been shown to reduce adverse cardiovascular events,its effect on the risk of AF remains debated.Some studies suggest a beneficial effect,whereas others are inconclusive.Therefore,a comprehensive review and meta-analysis are needed to clarify these effects.Objective:This study aims to evaluate the impact of intensive blood pressure lowering on the incidence of atrial fibrillation(AF)in hyper-tensive patients.Methods:We performed a systematic review and meta-analysis by searching PubMed,EMBASE,Scopus,Web of Science,and the Cochrane Library up to September 2,2024,for randomized controlled trials comparing intensive blood pressure lowering with standard treatment in hypertensive patients.Studies were included if participants were 40 year or older with systolic blood pressure between 130 and 180 mm Hg(1 mm Hg≈0.133 kPa).Data extraction was conducted by 2 independent researchers,and statistical analysis was performed using Review Manager(RevMan)5.4.Risk ratios(RRs)and 95%confidence intervals(CIs)were calculated.A random-effects model was applied if heterogeneity was detected(I^(2)>50%).Results:A total of 6 randomized controlled trials involving 34,824 participants were included in the analysis.Intensive blood pressure lowering significantly reduced the risk of new-onset AF compared with standard treatment(RR=0.76,95%CI=0.62–0.93,p<0.01,I^(2)=0%).Reductions were also observed in stroke(RR=0.71,95%CI=0.58–0.87,p<0.005,I^(2)=7%),HF(RR=0.67,95%CI=0.45–0.99,p=0.05,I^(2)=53%),and nonfatal coronary events(RR=0.80,95%CI=0.70–0.92,p<0.005,I^(2)=39%).However,intensive blood pressure lowering had no significant effect on cardiovascular mortality or all-cause mortality compared with standard treatment.Discussion:Intensive blood pressure lowering significantly reduces the risk of AF and other cardiovascular events,such as stroke,HF,and nonfatal coronary events,particularly among high-risk hypertensive patients.These findings support the potential benefits of inten-sive blood pressure management in reducing AF incidence and improving overall cardiovascular outcomes,but the evidence is limited.展开更多
基金supported financially by the National Natural Science Foundation of China(31100499 and 31672394)the Major Science and Technology Projects in Zhejiang Province(2020C02045)Zhejiang Science and Technology Commissioner Team Project.
文摘Tobacco polysaccharides were extracted by hot water extraction,and purified and separated using DEAE-52 cellulose chromatography columns,and three purified polysaccharide fractions,YCT-1,YCT-2,and YCT-3,were finally obtained.The physicochemical properties of the three fractions were analyzed by ultraviolet spectroscopy,high-performance liquid chromatography and high-performance gel chromatography.The in vitro antioxidant activity of tobacco polysaccharides was compared among different fractions by using DPPH radical,hydroxyl radical scavenging assay and potassium ferricyanide method.The in vitro hypoglycemic activity was compared usingα-amylase andα-glucosidase activity inhibition assay.And the in vitro hypolipidemic activity were investigated by using pancreatic lipase activity inhibition assay and HepG-2 intracellular lipid accumulation assay.All the results showed that the constituent monosaccharides of the three tobacco polysaccharide fractions were similar,but the molar percentages of each monosaccharide were different.The average molecular weights of the three components were 27,727 Da,27,587 Da,and 66,517 Da,respectively,and the scavenging activities on DPPH radicals and hydroxyl radicals were at a high level with good quantitative-effect relationships.The reducing power were much lower than that of the positive control VC,and the three polysaccharide fractions had a weak inhibitory ability onα-amylase activity,but showed excellent inhibitory ability onα-glucosidase and pancreatic lipase activity.In addition,the results of cellular experiments showed that all three fractions were able to inhibit lipid over-accumulation in HepG-2 cells by increasing the mRNA expression levels of PPAR-α,CPT-1A,and CYP7A1 genes,and the tobacco polysaccharide YCT-3 showed the best effect.The mechanism by which YCT-3 ameliorated the over-accumulation of intracellular lipids in HepG-2 cells was found to be related to its influence on the expression of miR-155-3p and miR-17-3p in the exosomes of HepG-2 cells.
基金the National Key Basic Research Program of China (No. 2014CB238905)
文摘High-alkali species in coal are notorious for causing ash slagging and fouling incidents.In this paper,four high-alkali coals were individually subject to hydrothermal pretreatment(HTP),within a batch-type autoclave at 300 -C for 1 h,and the treated coals were analyzed,along with the oxygen-containing functional groups determined by Fourier transform infrared spectrometer(FT-IR).Then the alkali species and other components in the coal ash were quantified by X-ray fluorescence(XRF)for evaluating the ash slagging and fouling tendency.Apart from this,FactSage was adopted to simulate the occurrence and transformation of alkali species during coal thermal conversion ending at various temperatures.The findings indicate that the treated coals are superior to the parent ones in terms of certain remarkable changes via HTP.The moisture,oxygen and sulfur of the hydrothermally treated coals decline obviously,while the calorific value rises sharply.HTP could reduce the alkali species to less than 2%(%,by weight,equivalent to Na2O in dry ash),with a maximum removal ratio of 88.9%,lowering the ash slagging and fouling tendency.The proposed mechanism of HTP was that the alkali species in coal matrix became released due to the breakage of the coal functional groups and micropores during HTP.
文摘There are many advantages of combining incretin therapy[glucagon-like peptide-1(GLP-1)receptor agonists and dipeptidyl peptidase-4(DPP-4)inhibitors]with insulin therapy as a glucose-lowering strategy in type2 diabetes.One important advantage is the complementary mode of the mechanistic action of incretin and insulin therapy.Another advantage is the reduction in risk of hypoglycemia and weight gain when adding incretin therapy to insulin.Several clinical trials have studied the addition of GLP-1 receptor agonists[exenatide BID(twice daily),lixisenatide,albiglutide]or DPP-4inhibitors(vildagliptin,sitagliptin,saxagliptin,alogliptin,linagliptin)to ongoing insulin therapy or adding insulin to ongoing therapy with a GLP-1 receptor agonist(liraglutide).These studies show improved glycemia in the presence of limited risk for hypoglycemia and weight gain with the combination of incretin therapy with insulin.This article reviews the background and clinical studies on this combination.
基金supported by the China Postdoctoral Science Foundation(No.2012M520774,No.2013T60393)Heilongjiang Postdoctoral Science Foundation(LBH-Z12156)
文摘Whether supplementation of curcuminoids decreases serum adipocyte-fatty acid binding protein（A-FABP） level and whether this decrease benefits glucose control is unclear.One-hundred participants（n=50 administered curcuminoids,n=50 administered placebo） from our previous report on the effect of curcuminoids on type 2 diabetes in a 3-month intervention were assessed for levels of serum A-FABP,oxidative stress,and inflammatory biomarkers.Curcuminoids supplementation led to significant decreases in serum A-FABP,C-reactive protein（CRP）,tumor necrosis factor-α,and interleukin-6 levels.Curcuminoids supplementation also significantly increased serum superoxide dismutase（SOD） activity.The change in serum A-FABP levels showed positive correlations with changes in levels of glucose,free fatty acids（FFAs）,and CRP in subjects supplemented with curcuminoids.Further stepwise regression analysis showed that A-FABP was an independent predictor for levels of FFAs,SOD,and CRP.These results suggest that curcuminoids may exert anti-diabetic effects,at least in part,by reductions in serum A-FABP level.A-FABP reduction is associated with improved metabolic parameters in human type 2 diabetes.
基金partially supported by the Capital Special Foundation of Clinical Application Research(Z121107001012015)the Capital Health Development Fund(2011400302,201614035)+1 种基金the Beijing Natural Science Foundation(7131014)CAMS Major Collaborative Innovation Project(2016-I2M-1-011)
文摘Objective Assessment of the comprehensive relationship among apolipoprotein CIII（apoCⅢ） levels, inflammation, and metabolic disorders is rare. Methods A total of 1455 consecutive patients not treated with lipid-lowering drugs and undergoing coronary angiography were enrolled in this cross-sectional study. A mediation analysis was used to detect the underlying role of apoCⅢ in the association of inflammation with metabolic syndrome（MetS）. Results Patients with MetS showed higher levels of apoCⅢ [95.1（73.1-131.4） vs. 81.7（58.6-112.4） μg/mL, P 〈 0.001] and inflammatory markers [high sensitivity C-reactive protein, 1.7（0.8-3.4） vs. 1.1（0.5-2.2） mg/L; white blood cell count,（6.48 ± 1.68） vs.（6.11 ± 1.67） × 10~9/L]. The levels of apoCⅢ and inflammatory markers increased with the number of metabolic risk components（all P 〈 0.001）. Furthermore, apoCⅢ levels were associated with virtually all individual MetS risk factors and inflammatory markers（all P 〈 0.05）. Importantly, the prevalence of MetS in each metabolic disorder rose as apoCⅢ levels increased（all P 〈 0.05）. Mediation analysis showed that apoCⅢ partially mediated the effect of inflammation on MetS independently from triglycerides. Conclusion Plasma apoCⅢ levels were significantly associated with the development and severity of MetS, and a role of apoCⅢ in the effect of inflammation on the development of MetS was identified.
基金supported by the Special Funds for the Development of National Major Scientific Instruments and Equipment,China(Grant No.2012YQ160007)the National Natural Science Foundation of China(Grant No.51277185)
文摘In this paper,the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and achieved.Combined with cavity-enhanced absorption spectroscopy,the noninvasive detection of H_2 with a prepared concentration of 500 ppm in multiple dissolved gases is performed and evaluated.The high frequency selectivity of 0.0051 cm^-1 at an acquisition time of 1 s allows the sensitive detection of the（1-0） S（l） band of H_2 with a high accuracy of（96.53±0.29）%and shows that the detection limit to an absorption line of 4712.9046 cm^-1 is approximately（17.26±0.63） ppm at an atmospheric pressure and a temperature of 20 ℃.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.60936005 and 61076097)the Cultivation Fund of the Key Scientific and Technical Innovation Project of Ministry of Education of China(Grant No.708083)the Fundamental Research Funds for the Central Universities,China(Grant No.20110203110012)
文摘The fringing-induced barrier lowering（FIBL） effect of sub-100 nm MOSFETs with high-k gate dielectrics is investigated using a two-dimensional device simulator.An equivalent capacitance theory is proposed to explain the physics mechanism of the FIBL effect.The FIBL effect is enhanced and the short channel performance is degraded with increasing capacitance.Based on equivalent capacitance theory,the influences of channel length,junction depth,gate/lightly doped drain（LDD） overlap length,spacer material and spacer width on FIBL is thoroughly investigated.A stack gate dielectric is presented to suppress the FIBL effect.
基金Supported by the National Natural Science Foundation of China(No. 30 1710 11)
文摘Preliminary tests in rats have shown that the title complex is an efficient insulin mimic, which may be the first example of polyoxomatalates possessing insulin mimetic activity.
基金supported by the Fundamental Research Funds for the Central Universities (Grant No. K50511250001)the National Natural Science Foundation of China (Grant No. 61076101)
文摘By solving Poisson＇s equation in both semiconductor and gate insulator regions in the cylindrical coordinates, an analytical model for a dual-material surrounding-gate （DMSG） metal-oxide semiconductor field-effect transistor （MOSFET） with a high-k gate dielectric has been developed. Using the derived model, the influences of fringing-induced barrier lowering （FIBL） on surface potential, subthreshold current, DIBL, and subthreshold swing are investigated. It is found that for the same equivalent oxide thickness, the gate insulator with high-k dielectric degrades the short-channel performance of the DMSG MOSFET. The accuracy of the analytical model is verified by the good agreement of its results with that obtained from the ISE three-dimensional numerical device simulator.
基金Project supported by the Pre-research Foundation from the National Ministries and Commissions of China （Grant No. 51308030201）.
文摘A new analytical model to describe the drain-induced barrier lowering （DIBL） effect has been obtained by solving the two-dimensional （2D） Poisson＇s equation for the dual-channel 4H-SiC MESFET （DCFET）. Using this analytical model, we calculate the threshold voltage shift and the sub-threshold slope factor of the DCFET, which characterize the DIBL effect. The results show that they are significantly dependent on the drain bias, gate length as well as the thickness and doping concentration of the two channel layers. Based on this analytical model, the structure parameters of the DCFET have been optimized in order to suppress the DIBL effect and improve the performance.
文摘The body current lowering effect of 130 nm partially depleted silicon-on-insulator (PDSOI) input/output (I/O) n-type metal-oxide-semiconductor field-effect transistors (NMOSFETs) induced by total-ionizing dose is observed and analyzed. The decay tendency of current ratio of body current and drain current I-b/I-d is also investigated. Theoretical analysis and TCAD simulation results indicate that the physical mechanism of body current lowering effect is the reduction of maximum lateral electric field of the pinch-off region induced by the trapped charges in the buried oxide layer (BOX). The positive charges in the BOX layer can counteract the maximum lateral electric field to some extent.
基金High-level Innovation Team and Outstanding Scholar Project of Guangxi Colleges and Universities(2019-52)"Qihuang Project"High-level Talent Team Cultivation Project of Guangxi University of Chinese Medicine(2018002)2019 Nanning City Level Scientific Research and Technology Development Planning Project(20193115)。
文摘[Objectives]This study was conducted to discuss the mechanism of the blood sugar-lowering effect of Cyclocarya paliurus extract.[Methods]With C.paliurus leaves as the raw material,the ethyl acetate-butyl acetate microwave extraction process of C.paliurus was studied.With the yield of C.paliurus extract as an evaluation index,single-factor experiments were carried out on such 6 factors as the dry C.paliurus leaf powder size,solid-to-liquid ratio,extraction time,microwave frequency,microwave power,and microwave extraction time,and the extraction and purification process was further optimized by response surface analysis.The normal mice and the hyperglycemic mice modeled by alloxan were injected with C.paliurus extract to study the blood sugar-lowering effects of different groups of C.paliurus extract.[Results]The optimal process combination for the extraction of C.paliurus leaves was obtained:dry C.paliurus powder size 90-100 mesh,solid-to-liquid ratio 1∶20(g/ml),extraction time 192 min,microwave frequency 2500 MHz,microwave power 490 W,and extraction time 248 s.Under these conditions,the yield of C.paliurus extract reached the maximum,95.10%,reaching 99.83%of the predicted value.The blood sugar-lowering test on mice showed that the C.paliurus extract had a good effect on lowering blood sugar,indicating that C.paliurus extract can improve the free radical scavenging capacity to a certain extent.[Conclusions]This study provides certain reference for the in-depth study of the physiological effects of C.paliurus extract and the comprehensive development and utilization of C.paliurus extract.
文摘Landscape distribution, macroscopic, microscopic, mineral and geochemical characterizations were conducted on the Doumbouo-Fokoué bauxite ore deposit in order to estimate bauxites potential and its implication to general lowering of the relief. Fourteen bauxitic plateaus covering a surface area of 5.7 km2 were identified. Bauxitic pedons show deep weathered profiles (10.0 - 12.0 m) with thick bauxitic mantle (4.0 - 8.0 m). Saprolite and pisolith bauxitic facies own high aluminium (47.5% - 49.5% Al2O3), relatively low iron (20.0% - 22.0% Fe2O3) and low silica contents (1.8% - 7.6% SiO2). Gibbsite is the dominant mineral (49% - 68% of minerals detected by X-ray);meanwhile hematite, goethite and kaolinite occur in small amounts. Bauxitization corresponds to intense allitization with abundant accumulation of gibbsite and development of lateritic iron bearing ortho-bauxites. Bauxite ores yielded bauxite reserves of 9.2 million tons. They occur as old and residual bauxitic mantles representing remnants of the Miocene residual lateritic deposits in West Cameroon referring to the African surface of Valeton [1]. Its mean altitude (1532 - 1590 m als) below the African surface reveals general lowering of the relief.
文摘Objective:To investigate the effect of lipid lowering mixture on blood lipid metabolism, LDL oxidative susceptibility and blood viscosity and coagulation in experimental hyperlipidemia rats.Method: Select 60 male Wistar rats were randomly divided into six groups, ten rats in each group were recorded as low as lipid-lowering mixture, high dose group and simvastatin group, model group and control group. Patients in control group were treated with basic feed for feeding, other groups of rats are used high fat diet were fed to establish hyperlipidemia rat model, in the process of modeling and prophylactically, determination of rats after 10 weeks of lipid metabolism and susceptibility of LDL to oxidation and blood viscosity concentration coagulation state.Result: Antioxidant capacity of the model group rat's serum LDL-C decreased significantly, and simvastatin group and three groups of lipid-lowering mixture group rats serum LDL antioxidant capacity were significantly enhanced;and high lipid mixture, LDL antioxidant ability in middle dose group rats were significantly higher than those of the Jiangzhi Decoction low dose group rats (P<0.05). Lipid mixture of high, middle dose group rats of EET and ETA P, ETA B (high, medium and low shear), IED, HCT, the role of the IEA was significantly higher in Jiangzhi Decoction low dose group rats (P<0.05 or P<0.05).Conclusion:Lipid-lowering mixture on experimental hyperlipidemia rats blood lipid metabolism and blood viscosity concentration coagulation state has a good regulatory role, and lipid-lowering mixture on blood lipid and blood flow abnormalities lipid-lowering mixture can also play a good regulation and therapeutic effect.
文摘In view of the situation of excavation of should carry out simulation studies for the numerical open coal mine for the underground water disaster, we value of the water lowering project and improve the accuracy and the level of the water lowering project. On the basis of the hydrological geological conditions of certain open mine digging, a more reasonable seepage numerical model was built according to MODFLOW. It was simulated in advance that the process of the confined water level descending with the time, and combining with the actual observations to test the correctness of the model. The calculation showed that the results coincided well with the results of actual measurement. Based on this, different water lowering numerical simulations were built for the open coal mine digging. It could be simulated and forecast that the changes of the groundwater level in drainage process within and outside the mine pit, and it was quantitatively assessed that the possible water lowering result of the opencast water drainage process, which provide an important basis for the actual water lowering project and the possible project disposal.
基金Project supported by the Pre-research Foundation from the National Ministries and Commissions of China (Grant No. 51308030201)
文摘A new analytical model to describe the drain-induced barrier lowering(DIBL) effect has been obtained by solving the two-dimensional(2D) Poisson’s equation for the dual-channel 4H-SiC MESFET(DCFET).Using this analytical model,we calculate the threshold voltage shift and the sub-threshold slope factor of the DCFET,which characterize the DIBL effect.The results show that they are significantly dependent on the drain bias,gate length as well as the thickness and doping concentration of the two channel layers.Based on this analytical model,the structure parameters of the DCFET have been optimized in order to suppress the DIBL effect and improve the performance.
基金supported by National Natural Science Foundation of China(No.81641058)
文摘Background The incidence of leg edema caused by calcium channel blockers（CCB） is so high, some studies tried combination with angiotension converting enzyme inhibitors（ACEI） or diuretics to overcome this problem.However, there is no comparison about which is better to improve edema at present. Methods This study was designed as a single-center, prospective, randomized, double-blind, parallel-group, clinical trial. 224 hypertensive patients with leg edema after 4 weeks since taking levamlodipine were enrolled, and they were randomly divided into levamlodipine ＋ furosemide（CD） group and levamlodipine ＋ enalapril（CA） group for another 4 weeks. Ankle circumference（AC）, edema score（ES）, blood pressure（BP） and cure rate of leg edema were evaluated. Results Altogether 179 patients（89 in CD group and 90 in CA group） completed the 4-week treatment. After the 4-week therapy with furosemide or enalapril, most subjects were free of edema in either group（96.51% vs.96.67%, P 〉 0.05）. Only 4 in CD group and 3 in CA group had mild edema. Enalapril was more effective than furosemide to reduce AC（10.92 ± 1.84 mm vs. 12.97 ± 2.46 mm, P 〈 0.05）. But for ES, there was no significant difference. And there were no significant differences in antihypertensive effect between them. Uric acid（UA）was increased significantly in CD group（10.70 ± 18.48 μmol/L vs. 0.22 ± 28.13 μmol/L, P 〈 0.05）. Conclusion Enalapril is more effective than furosemide in attenuating lower extremity edema caused by levamlodipine in essential hypertensive population, with equal antihypertensive efficacy and less uric acid increasing.
基金funded by grants from the Central High-Level Traditional Chinese Medicine Hospital Project of Eye Hospital China Academy of Chinese Medical Sciences(GSP2-02)Science and Technology Innovation Project of China Academy of Chinese Medical Sciences(CI2021A00906)Beijing Natural Science Foundation(7232324).
文摘Background:Hypertension is a major risk factor for cardiovascular diseases,including AF,which is one of the most common cardiac arrhythmias globally.AF is strongly associated with an increased risk of stroke,heart failure(HF),and cardiovascular mortality.Although intensive blood pressure lowering has been shown to reduce adverse cardiovascular events,its effect on the risk of AF remains debated.Some studies suggest a beneficial effect,whereas others are inconclusive.Therefore,a comprehensive review and meta-analysis are needed to clarify these effects.Objective:This study aims to evaluate the impact of intensive blood pressure lowering on the incidence of atrial fibrillation(AF)in hyper-tensive patients.Methods:We performed a systematic review and meta-analysis by searching PubMed,EMBASE,Scopus,Web of Science,and the Cochrane Library up to September 2,2024,for randomized controlled trials comparing intensive blood pressure lowering with standard treatment in hypertensive patients.Studies were included if participants were 40 year or older with systolic blood pressure between 130 and 180 mm Hg(1 mm Hg≈0.133 kPa).Data extraction was conducted by 2 independent researchers,and statistical analysis was performed using Review Manager(RevMan)5.4.Risk ratios(RRs)and 95%confidence intervals(CIs)were calculated.A random-effects model was applied if heterogeneity was detected(I^(2)>50%).Results:A total of 6 randomized controlled trials involving 34,824 participants were included in the analysis.Intensive blood pressure lowering significantly reduced the risk of new-onset AF compared with standard treatment(RR=0.76,95%CI=0.62–0.93,p<0.01,I^(2)=0%).Reductions were also observed in stroke(RR=0.71,95%CI=0.58–0.87,p<0.005,I^(2)=7%),HF(RR=0.67,95%CI=0.45–0.99,p=0.05,I^(2)=53%),and nonfatal coronary events(RR=0.80,95%CI=0.70–0.92,p<0.005,I^(2)=39%).However,intensive blood pressure lowering had no significant effect on cardiovascular mortality or all-cause mortality compared with standard treatment.Discussion:Intensive blood pressure lowering significantly reduces the risk of AF and other cardiovascular events,such as stroke,HF,and nonfatal coronary events,particularly among high-risk hypertensive patients.These findings support the potential benefits of inten-sive blood pressure management in reducing AF incidence and improving overall cardiovascular outcomes,but the evidence is limited.
