AIM:To compare the consistency of two autorefractors(Tianle RM-9000 and Topcon KR-800)for school-age myopia children,and to provide a basis for largescale data analysis and comparison.METHODS:The refractive error in 9...AIM:To compare the consistency of two autorefractors(Tianle RM-9000 and Topcon KR-800)for school-age myopia children,and to provide a basis for largescale data analysis and comparison.METHODS:The refractive error in 909 subjects(age 4–18y)were measured using both autorefractors without cycloplegia.The data were analyzed using Fourier decomposition and the correlation coefficients,intraclass correlation coefficients(ICC),and Bland-Altman limits of agreement(LoA)for each parameter were calculated.RESULTS:There was a strong correlation between the spherical equivalent(SE),sphere diopter(DS),and cylinder diopter(DC)readings of the Tianle RM-9000 and those of the Topcon KR-800,with correlation coefficient values of 0.98,0.98 and 0.83 and ICC values of 0.99,0.99 and 0.93,respectively.However,the correlation coefficients and ICC values of J0 and J45 were unreliable(R=-0.004,-0.034;both ICC<0.10).Bland-Altman analysis revealed that SE,DS,and DC measured by the Tianle RM-9000 were significantly biased toward myopia compared with the Topcon KR-800,and the mean differences were-0.072,-0.026,-0.091 D,respectively(all P<0.01).The minimum absolute value of the difference within the 95%LoA for SE,DS,and DC was 0.63 D,0.50 D,0.62 D,respectively;all these values were in the clinically acceptable range.For J0 and J45,the mean differences were close to zero(P=0.43,0.84);however,the 95%LoA were relatively wide(J0 SD:0.53;95%CI:-1.00,1.10;J45 SD:0.52;95%CI:-1.00,1.00).CONCLUSION:The two autorefractors are consistent with each other,as the differences in SE,DS,and DC were within the clinically acceptable range.Readers can compare the data measured by either device in different studies and use the two devices in the same study to generate a dataset that can be analyzed together.However,the J0 and J45 vectors are unreliable and should not be used to assess astigmatism.展开更多
In this study, the enclosure system exhibited perfect nitrogen removal performance with in situ oxygen-enhanced indigenous aerobic denitrifying bacteria in an enclosure experiment. We explored changes in the microbial...In this study, the enclosure system exhibited perfect nitrogen removal performance with in situ oxygen-enhanced indigenous aerobic denitrifying bacteria in an enclosure experiment. We explored changes in the microbial community during the nitrogen removal process using the MiSeq high-throughput sequencing technology. The results revealed a total of 7974 and 33653 operational taxonomic units(OTUs) for water and sediment systems, respectively, with 97% similarity. The OTUs were found to be affiliated with eight main phyla(Proteobacteria, Actinobacteria, Cyanobacteria, Bacteroidetes, Planctomycetes, Chloroflexi, Firmicutes, and Actinobacteria). The diversity of the enhanced system was found to be higher than that of the control system. Principal component analysis(PCA) revealed that significant spatial and temporal differences were exhibited in the microbial community during nitrogen removal in the enclosure experiment. Redundancy analysis(RDA)indicated that physical parameters(temperature, dissolved oxygen, and pH), nitrogen(total nitrogen and nitrate), functional genes(nirK and nirS), and dissolved organic carbon(DOC) were the most important factors affecting bacterial community function and composition. Lastly, the results suggested that the variation in the microbial community could be analyzed through the MiSeq high-throughput sequencing technology,which may provide technical support for future field tests.展开更多
Gastric cancer is the result of multiple risk factors,including environmental factors,genetic factors and the interaction between them.The environmental factors mainly include dietary,Helicobacter pylori infection and...Gastric cancer is the result of multiple risk factors,including environmental factors,genetic factors and the interaction between them.The environmental factors mainly include dietary,Helicobacter pylori infection and family history of gastric cancer.Genetic factors mainly refer to the susceptible genes that cause epigenetic alterations in oncogenes,tumor suppress genes,cell cycle regulators,DNA repair genes and signaling molecules.This paper summarizes the susceptible genes of gastric cancer and explores the genetic basis of it.展开更多
With the development of modern bio-psycho-social medical model and traditional Chinese medicine(TCM)constitution theory,we gradually realize that the exploration of the constitution characteristics of insomnia is of g...With the development of modern bio-psycho-social medical model and traditional Chinese medicine(TCM)constitution theory,we gradually realize that the exploration of the constitution characteristics of insomnia is of great significance for the reveal of the origin of insomnia and the innovation of its treatment and nursing methods.This paper focused on the analysis of the investigation of TCM constitution classification of insomnia and the application of TCM constitution theory in the treatmentand nursing of insomnia.Moreover,the research prospect of insomnia in TCM constitution was discussed.The purpose is to provide theoretical basis for the treatment and nursing of patients with insomnia based on analysis of constitution differentiationin the future,and to better serve the clinic.展开更多
Objective:To generate recombinant adenovirus that could simultaneously express ornithine decarboxylase(ODC) and S-adenosylmethionine decarboxylase(AdoMetDC) antisenses specifically in prostate cancer cells,and ev...Objective:To generate recombinant adenovirus that could simultaneously express ornithine decarboxylase(ODC) and S-adenosylmethionine decarboxylase(AdoMetDC) antisenses specifically in prostate cancer cells,and evaluate its inhibitory effect on prostate cancer in vivo.Methods:Fragments of ODC and AdoMetDC genes were generated by PCR,cloned into the pPGL-PSES,and then recombined with pAdEasy-1 vectors in AdEasy-1 cells.Ad-PSES-ODC-AdoMetDCas virus was produced in HEK293 cells.Following transfection with Ad-PSES-ODC-AdoMetDCas,the levels of ODC or AdoMetDC were determined by RT-PCR and western blot assays.The effect of Ad-PSES-ODC-AdoMetDCas treatment on tumor formation and growth was evaluated in xenograft models of prostate cancers in vivo.Results:The plasmid pAdEasy-PSES-ODC-AdoMetDCas was successfully constructed and the recombinant Ad-PSES-ODC-AdoMetDCas adenovirus was produced.Transfection with Ad-PSES-ODC-AdoMetDCas adenovirus significantly inhibited the expression of ODC and AdoMetDC genes specifically in prostate DU145 cells,but not H1299,HT29 and HepG2 cancer cells,and disrupted the ability of DU145 cells to form solid prostate cancer in vivo.Intratumoral treatment with Ad-PSES-ODC-AdoMetDCas adenovirus significantly inhibited the growth of engrafted prostate tumors in vivo.Conclusion:The recombinant Ad-PSES-ODC-AdoMetDCas adenovirus specifically reduces the expression of both ODC and AdoMetDC genes in prostate cells and may be used for treatment of prostate cancers at the clinic.展开更多
In recent years, the prevalence of obesity has been increasing year by year, leading to a rise in serious complications. The pathogenesis of obesity is complicated in which the intestinal flora plays an important role...In recent years, the prevalence of obesity has been increasing year by year, leading to a rise in serious complications. The pathogenesis of obesity is complicated in which the intestinal flora plays an important role. Intestinal micro ecology is composed of large and complex intestinal flora that participate in important physiological functions such as metabolism, energy conversion, maintaining intestinal mucosal defense function, and promoting immune system development and maturation and other important physiological functions;furthermore, they are influenced by the host’s genetic background, diet, and other factors. Therefore, intestinal microflora has potential as a new field of drug therapy. At present, it is found that traditional Chinese medicine therapy may prevent and treat obesity by interfering with the intestinal flora, which is expected to become one of the main treatment methods for obese patients. However, its mechanism of action remains unclear. The balance of intestinal flora can be adjusted by acupuncture, massage, and acupoint application. By analyzing the mechanism of obesity caused by intestinal micro ecology and the impact of obesity on the host’s intestinal micro ecological environment, this paper discusses the influence of oral Chinese medicine, acupuncture, massage, acupoint sticking, and other traditional Chinese medicine therapies on the intestinal microflora in obese patients and provides a scientific basis for its clinical application.展开更多
Pelvic inflammatory disease refers to a group of female genital tr act on infec tious disease, mainly including endometritis, tubal phlogistic, oviduct ovarian abscess, if not 廿mely tr eatment of the disease is easy ...Pelvic inflammatory disease refers to a group of female genital tr act on infec tious disease, mainly including endometritis, tubal phlogistic, oviduct ovarian abscess, if not 廿mely tr eatment of the disease is easy to become chr onic, now called pelvic inflammatory disease sequelae, clinical manifestations in chronic pelvic pain, recurrent pelvic inflammatory disease, affect women's physical and mental health. TCM nursing based on the basic theory of TCM, apply the overall view, the nursing method of syndrome differentiation, the traditional Chinese medicine nursing technique is widely used in the disease, such as traditional Chinese medicine enema, Chinese medicine external treatment, moxibustion, ear acupuncture point buries a seed, methods of modern nursing, has the characteristics of simple and cheap effect, can reduce the swelling fights, promoting blood circulation to remove blood stasis, relieve the pelvic congestion, promote drainage in abdominal and pelvic cavity and the absorption of bag piece, adjust the viscera function, obvious effect and has unique advantages, further prove the uniqueness of TCM nursing and safety, provide the basis for clinical treatment.展开更多
This paper expounds the theory of traditional Chinese medicine(TCM)constitution applied to patients with cervical spondylosis,in order to clarify the distribution characteristics of TCM constitution of patients with c...This paper expounds the theory of traditional Chinese medicine(TCM)constitution applied to patients with cervical spondylosis,in order to clarify the distribution characteristics of TCM constitution of patients with cervical spondylosis.And to analyze the correlation between TCM constitution theory and cervical spondylosis is helpful to provide ideas for integrated nursing care of TCM and western medicine in patients with cervical spondylosis,and provide the basis for the construction of health management program and the evaluation of health promotion effect.展开更多
Tumor pain is common in patients with advanced cancer;70-80% have varying degrees of pain. Treatment of cancer pain has become a difficult issue in oncology, poor pain control often seriously affects the patients'...Tumor pain is common in patients with advanced cancer;70-80% have varying degrees of pain. Treatment of cancer pain has become a difficult issue in oncology, poor pain control often seriously affects the patients' life quality. Traditional Chinese medicine (TCM) nursing intervention can improve symptoms and quality of life (QOL) through massage, external treatment of traditional Chinese medicine, and auricular therapy, which have unique curative effects such as regulating qi and blood, stabilizing the mind, and enhancing immunity. Not only does TCM nursing intervention prevent disease but also cultivates the mind, helps achieve systemic relaxation, and reduces the pain of cancer patients and the toxic side effects of painkillers, so as to improve QOL and satisfaction, making it worthy of clinical popularization and application. At present, there is an urgent need to carry out high-quality, multi-center, large-sample randomized controlled trials and develop a standardized TCM nursing intervention implementation scheme and efficacy standards to promote its application.展开更多
Ischemic heart diseases are one of the major causes of death worldwide. Effective restoration of blood flow can significantly improve patients’ quality of life and reduce mortality. However, reperfusion injury cannot...Ischemic heart diseases are one of the major causes of death worldwide. Effective restoration of blood flow can significantly improve patients’ quality of life and reduce mortality. However, reperfusion injury cannot be ignored. Flavonoids possess well-established antioxidant properties;They also have other benefits that may be relevant for ameliorating myocardial ischemia-reperfusion injury(MIRI). In this review,we focus on flavonoids with cardiovascular-protection function and emphasize their pharmacological effects. The main mechanisms of flavonoid pharmacological activities against MIRI involve the following aspects: a) antioxidant, b) anti-inflammatory, c) anti-platelet aggregation, d) anti-apoptosis, and e)myocardial-function regulation activities. We also summarized the effectiveness of flavonoids for MIRI.展开更多
NiCrSiB modified layer was synthesized on Monel 400 by laser cladding,aiming at improving cavitation erosion and corrosion resistance.The microstructure,chemical composition,phase constituents and microhardness were i...NiCrSiB modified layer was synthesized on Monel 400 by laser cladding,aiming at improving cavitation erosion and corrosion resistance.The microstructure,chemical composition,phase constituents and microhardness were investigated using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),X-ray diffractometry(XRD) and microhardness tester.The cavitation erosion and corrosion behaviors of the modified layer were also evaluated using an ultrasonic vibrator and potentiodynamic polarization measurement,respectively.Experimental results show that by varying the laser fluence,a hard NiCrSiB modified layer with little airholes,cracks or other defects could be obtained.NiCrSiB modified layer is ~1.1 mm in thickness.The microstructure of the modified layer exhibits cellular dendrite,flake-like dendrite and multiple eutectic phase.The modified layer is mainly composed of γ-Ni solid solution,chromium carbide(Cr_(7)C_(3)and Cr_(23)C_(6)) and Ni_(3)B.The microhardness of the modified layer is ~6.8 times that of Monel 400 substrate.Both the cavitation erosion and corrosion resistance of the modified layer are improved.In the cavitation erosion test,the cumulative erosion loss and erosion loss rate of the modified layer are one order of magnitude lower than that of the substrate.In the electrochemical corrosion test,the corrosion potentials of the substrate and the modified layer are similar.The corrosion current densities of the substrate and the modified layer are 11.12 and 1.95 μA·cm^(-2),respectively.By comparing their corrosion current densities,the corrosion resistance of the modified layer is about 5.7 times that of the substrate.展开更多
A metal-flee purple H2Pc single crystal was synthesized by a facile solvothermal method, and its solubility and near-infrared (NIR) optical properties were also investigated due to its potential applications as a li...A metal-flee purple H2Pc single crystal was synthesized by a facile solvothermal method, and its solubility and near-infrared (NIR) optical properties were also investigated due to its potential applications as a light-emitting layer for OLEDs. The H2Pc single crystal is insoluble in 1-chlorine naphthalene and other organic solvents. It gives a wide absorption in the range from 620 nm to 679 nm and a wide emission in near 922 nm. As an active light-emitting layer, H2Pc was employed to fabricate electroluminescent (EL) devices with a structure of ITO/NPB (30 nm)/Alq3:H2Pc (30 nm)/BCP (20 nm)/ Alq3 (20 nm)/Al. The emission center is at 936 nm when the H2Pc doping concentration is 20 wt%. The doping concentration strongly governs the emission intensity. When doping concentration decreases from 10 wt% to 1 wt%, the emission intensity remarkably fades, and simultaneously the emission center undergoes a blue shift.展开更多
Direct laser metal deposition is a kind of advanced rapid manufacturing technology, which can produce near net shape parts by depositing metal powders layer by layer. This study demonstrates fabrication, the anisotrop...Direct laser metal deposition is a kind of advanced rapid manufacturing technology, which can produce near net shape parts by depositing metal powders layer by layer. This study demonstrates fabrication, the anisotropy of mechanical properties and hardness of a graded steel. The characteristics of constituent phases, microstructure, mechanical anisotropy, and microhardness were investigated using electron backscatter diffraction, optical microscopy, tensile test machine, and microhardness tester. It was found that the graded steel is dense and free of cracks. The crystal structures of the as-built samples evolved in three grades from fcc structures to fcc + bcc structures and then to bcc + fcc structures. Samples in x and z directions showed obvious mechanical anisotropy. The samples machined in x direction showed higher strength and lower elongation than those machined in z direction due to the presence of lack-of-fusion pores and the higher metallurgical bonding between layers in the x direction. The microhardness of the as-built samples increased along the cross section from the substrate (159.7 HV) to the top surface (545.4 HV).展开更多
基金Supported by the National Natural Science Foundation of China(No.81873683).
文摘AIM:To compare the consistency of two autorefractors(Tianle RM-9000 and Topcon KR-800)for school-age myopia children,and to provide a basis for largescale data analysis and comparison.METHODS:The refractive error in 909 subjects(age 4–18y)were measured using both autorefractors without cycloplegia.The data were analyzed using Fourier decomposition and the correlation coefficients,intraclass correlation coefficients(ICC),and Bland-Altman limits of agreement(LoA)for each parameter were calculated.RESULTS:There was a strong correlation between the spherical equivalent(SE),sphere diopter(DS),and cylinder diopter(DC)readings of the Tianle RM-9000 and those of the Topcon KR-800,with correlation coefficient values of 0.98,0.98 and 0.83 and ICC values of 0.99,0.99 and 0.93,respectively.However,the correlation coefficients and ICC values of J0 and J45 were unreliable(R=-0.004,-0.034;both ICC<0.10).Bland-Altman analysis revealed that SE,DS,and DC measured by the Tianle RM-9000 were significantly biased toward myopia compared with the Topcon KR-800,and the mean differences were-0.072,-0.026,-0.091 D,respectively(all P<0.01).The minimum absolute value of the difference within the 95%LoA for SE,DS,and DC was 0.63 D,0.50 D,0.62 D,respectively;all these values were in the clinically acceptable range.For J0 and J45,the mean differences were close to zero(P=0.43,0.84);however,the 95%LoA were relatively wide(J0 SD:0.53;95%CI:-1.00,1.10;J45 SD:0.52;95%CI:-1.00,1.00).CONCLUSION:The two autorefractors are consistent with each other,as the differences in SE,DS,and DC were within the clinically acceptable range.Readers can compare the data measured by either device in different studies and use the two devices in the same study to generate a dataset that can be analyzed together.However,the J0 and J45 vectors are unreliable and should not be used to assess astigmatism.
基金supported by the National Science and Technology Pillar Program(Grant No.2012BAC04B02)the National Natural Science Foundation of China(Grant No.51478378)
文摘In this study, the enclosure system exhibited perfect nitrogen removal performance with in situ oxygen-enhanced indigenous aerobic denitrifying bacteria in an enclosure experiment. We explored changes in the microbial community during the nitrogen removal process using the MiSeq high-throughput sequencing technology. The results revealed a total of 7974 and 33653 operational taxonomic units(OTUs) for water and sediment systems, respectively, with 97% similarity. The OTUs were found to be affiliated with eight main phyla(Proteobacteria, Actinobacteria, Cyanobacteria, Bacteroidetes, Planctomycetes, Chloroflexi, Firmicutes, and Actinobacteria). The diversity of the enhanced system was found to be higher than that of the control system. Principal component analysis(PCA) revealed that significant spatial and temporal differences were exhibited in the microbial community during nitrogen removal in the enclosure experiment. Redundancy analysis(RDA)indicated that physical parameters(temperature, dissolved oxygen, and pH), nitrogen(total nitrogen and nitrate), functional genes(nirK and nirS), and dissolved organic carbon(DOC) were the most important factors affecting bacterial community function and composition. Lastly, the results suggested that the variation in the microbial community could be analyzed through the MiSeq high-throughput sequencing technology,which may provide technical support for future field tests.
文摘Gastric cancer is the result of multiple risk factors,including environmental factors,genetic factors and the interaction between them.The environmental factors mainly include dietary,Helicobacter pylori infection and family history of gastric cancer.Genetic factors mainly refer to the susceptible genes that cause epigenetic alterations in oncogenes,tumor suppress genes,cell cycle regulators,DNA repair genes and signaling molecules.This paper summarizes the susceptible genes of gastric cancer and explores the genetic basis of it.
文摘With the development of modern bio-psycho-social medical model and traditional Chinese medicine(TCM)constitution theory,we gradually realize that the exploration of the constitution characteristics of insomnia is of great significance for the reveal of the origin of insomnia and the innovation of its treatment and nursing methods.This paper focused on the analysis of the investigation of TCM constitution classification of insomnia and the application of TCM constitution theory in the treatmentand nursing of insomnia.Moreover,the research prospect of insomnia in TCM constitution was discussed.The purpose is to provide theoretical basis for the treatment and nursing of patients with insomnia based on analysis of constitution differentiationin the future,and to better serve the clinic.
基金supported by the National Natural Science Foundation of China(No.30900730)the grants from the Natural Science Foundation of Shangdong Province(No.Q2007D01)
文摘Objective:To generate recombinant adenovirus that could simultaneously express ornithine decarboxylase(ODC) and S-adenosylmethionine decarboxylase(AdoMetDC) antisenses specifically in prostate cancer cells,and evaluate its inhibitory effect on prostate cancer in vivo.Methods:Fragments of ODC and AdoMetDC genes were generated by PCR,cloned into the pPGL-PSES,and then recombined with pAdEasy-1 vectors in AdEasy-1 cells.Ad-PSES-ODC-AdoMetDCas virus was produced in HEK293 cells.Following transfection with Ad-PSES-ODC-AdoMetDCas,the levels of ODC or AdoMetDC were determined by RT-PCR and western blot assays.The effect of Ad-PSES-ODC-AdoMetDCas treatment on tumor formation and growth was evaluated in xenograft models of prostate cancers in vivo.Results:The plasmid pAdEasy-PSES-ODC-AdoMetDCas was successfully constructed and the recombinant Ad-PSES-ODC-AdoMetDCas adenovirus was produced.Transfection with Ad-PSES-ODC-AdoMetDCas adenovirus significantly inhibited the expression of ODC and AdoMetDC genes specifically in prostate DU145 cells,but not H1299,HT29 and HepG2 cancer cells,and disrupted the ability of DU145 cells to form solid prostate cancer in vivo.Intratumoral treatment with Ad-PSES-ODC-AdoMetDCas adenovirus significantly inhibited the growth of engrafted prostate tumors in vivo.Conclusion:The recombinant Ad-PSES-ODC-AdoMetDCas adenovirus specifically reduces the expression of both ODC and AdoMetDC genes in prostate cells and may be used for treatment of prostate cancers at the clinic.
文摘In recent years, the prevalence of obesity has been increasing year by year, leading to a rise in serious complications. The pathogenesis of obesity is complicated in which the intestinal flora plays an important role. Intestinal micro ecology is composed of large and complex intestinal flora that participate in important physiological functions such as metabolism, energy conversion, maintaining intestinal mucosal defense function, and promoting immune system development and maturation and other important physiological functions;furthermore, they are influenced by the host’s genetic background, diet, and other factors. Therefore, intestinal microflora has potential as a new field of drug therapy. At present, it is found that traditional Chinese medicine therapy may prevent and treat obesity by interfering with the intestinal flora, which is expected to become one of the main treatment methods for obese patients. However, its mechanism of action remains unclear. The balance of intestinal flora can be adjusted by acupuncture, massage, and acupoint application. By analyzing the mechanism of obesity caused by intestinal micro ecology and the impact of obesity on the host’s intestinal micro ecological environment, this paper discusses the influence of oral Chinese medicine, acupuncture, massage, acupoint sticking, and other traditional Chinese medicine therapies on the intestinal microflora in obese patients and provides a scientific basis for its clinical application.
文摘Pelvic inflammatory disease refers to a group of female genital tr act on infec tious disease, mainly including endometritis, tubal phlogistic, oviduct ovarian abscess, if not 廿mely tr eatment of the disease is easy to become chr onic, now called pelvic inflammatory disease sequelae, clinical manifestations in chronic pelvic pain, recurrent pelvic inflammatory disease, affect women's physical and mental health. TCM nursing based on the basic theory of TCM, apply the overall view, the nursing method of syndrome differentiation, the traditional Chinese medicine nursing technique is widely used in the disease, such as traditional Chinese medicine enema, Chinese medicine external treatment, moxibustion, ear acupuncture point buries a seed, methods of modern nursing, has the characteristics of simple and cheap effect, can reduce the swelling fights, promoting blood circulation to remove blood stasis, relieve the pelvic congestion, promote drainage in abdominal and pelvic cavity and the absorption of bag piece, adjust the viscera function, obvious effect and has unique advantages, further prove the uniqueness of TCM nursing and safety, provide the basis for clinical treatment.
文摘This paper expounds the theory of traditional Chinese medicine(TCM)constitution applied to patients with cervical spondylosis,in order to clarify the distribution characteristics of TCM constitution of patients with cervical spondylosis.And to analyze the correlation between TCM constitution theory and cervical spondylosis is helpful to provide ideas for integrated nursing care of TCM and western medicine in patients with cervical spondylosis,and provide the basis for the construction of health management program and the evaluation of health promotion effect.
文摘Tumor pain is common in patients with advanced cancer;70-80% have varying degrees of pain. Treatment of cancer pain has become a difficult issue in oncology, poor pain control often seriously affects the patients' life quality. Traditional Chinese medicine (TCM) nursing intervention can improve symptoms and quality of life (QOL) through massage, external treatment of traditional Chinese medicine, and auricular therapy, which have unique curative effects such as regulating qi and blood, stabilizing the mind, and enhancing immunity. Not only does TCM nursing intervention prevent disease but also cultivates the mind, helps achieve systemic relaxation, and reduces the pain of cancer patients and the toxic side effects of painkillers, so as to improve QOL and satisfaction, making it worthy of clinical popularization and application. At present, there is an urgent need to carry out high-quality, multi-center, large-sample randomized controlled trials and develop a standardized TCM nursing intervention implementation scheme and efficacy standards to promote its application.
基金financial supports from the National Natural Science Foundation of China (No. 81874336, 81303306)Tianjin Applied Basic and Frontier Technology Research Plan (15JCQNJC13400)The National Natural Science Foundation of Inner Mongolia (2018ZD13)。
文摘Ischemic heart diseases are one of the major causes of death worldwide. Effective restoration of blood flow can significantly improve patients’ quality of life and reduce mortality. However, reperfusion injury cannot be ignored. Flavonoids possess well-established antioxidant properties;They also have other benefits that may be relevant for ameliorating myocardial ischemia-reperfusion injury(MIRI). In this review,we focus on flavonoids with cardiovascular-protection function and emphasize their pharmacological effects. The main mechanisms of flavonoid pharmacological activities against MIRI involve the following aspects: a) antioxidant, b) anti-inflammatory, c) anti-platelet aggregation, d) anti-apoptosis, and e)myocardial-function regulation activities. We also summarized the effectiveness of flavonoids for MIRI.
基金financially supported by the National Key Research and Development Program of China (Nos. 2016YFB1100204,2013ZX06002-002)the National Natural Science Foundation of China (No.51271126)Shenyang Science and Technology Funded Project (No.F16-032-0-00)
文摘NiCrSiB modified layer was synthesized on Monel 400 by laser cladding,aiming at improving cavitation erosion and corrosion resistance.The microstructure,chemical composition,phase constituents and microhardness were investigated using scanning electron microscope(SEM),energy-dispersive spectrometer(EDS),X-ray diffractometry(XRD) and microhardness tester.The cavitation erosion and corrosion behaviors of the modified layer were also evaluated using an ultrasonic vibrator and potentiodynamic polarization measurement,respectively.Experimental results show that by varying the laser fluence,a hard NiCrSiB modified layer with little airholes,cracks or other defects could be obtained.NiCrSiB modified layer is ~1.1 mm in thickness.The microstructure of the modified layer exhibits cellular dendrite,flake-like dendrite and multiple eutectic phase.The modified layer is mainly composed of γ-Ni solid solution,chromium carbide(Cr_(7)C_(3)and Cr_(23)C_(6)) and Ni_(3)B.The microhardness of the modified layer is ~6.8 times that of Monel 400 substrate.Both the cavitation erosion and corrosion resistance of the modified layer are improved.In the cavitation erosion test,the cumulative erosion loss and erosion loss rate of the modified layer are one order of magnitude lower than that of the substrate.In the electrochemical corrosion test,the corrosion potentials of the substrate and the modified layer are similar.The corrosion current densities of the substrate and the modified layer are 11.12 and 1.95 μA·cm^(-2),respectively.By comparing their corrosion current densities,the corrosion resistance of the modified layer is about 5.7 times that of the substrate.
基金financially supported by the Ph.D. Initiative Science Foundation of Inner Mongolia University for the Nationalities(Nos. BS289, BS314)Natural Science Research Project of Inner Mongolia University for the Nationalities (No. NMDYB15076)the Fundamental Research Funds for the Central Universities (No. DUT14LK02)
文摘A metal-flee purple H2Pc single crystal was synthesized by a facile solvothermal method, and its solubility and near-infrared (NIR) optical properties were also investigated due to its potential applications as a light-emitting layer for OLEDs. The H2Pc single crystal is insoluble in 1-chlorine naphthalene and other organic solvents. It gives a wide absorption in the range from 620 nm to 679 nm and a wide emission in near 922 nm. As an active light-emitting layer, H2Pc was employed to fabricate electroluminescent (EL) devices with a structure of ITO/NPB (30 nm)/Alq3:H2Pc (30 nm)/BCP (20 nm)/ Alq3 (20 nm)/Al. The emission center is at 936 nm when the H2Pc doping concentration is 20 wt%. The doping concentration strongly governs the emission intensity. When doping concentration decreases from 10 wt% to 1 wt%, the emission intensity remarkably fades, and simultaneously the emission center undergoes a blue shift.
基金financially supported by the National Key Research and Development Program of China (Grant Nos. 2016YFB1100204 and 2013ZX06002-002)the Shenyang Science and Technology Funded Project (Grant Nos. 17-29-2-00, Y17-1-031 and Z17-2-002)Financial support by the Youth Foundation of School of Stomatology, China Medical University (Grant No. K101593-17-05)
文摘Direct laser metal deposition is a kind of advanced rapid manufacturing technology, which can produce near net shape parts by depositing metal powders layer by layer. This study demonstrates fabrication, the anisotropy of mechanical properties and hardness of a graded steel. The characteristics of constituent phases, microstructure, mechanical anisotropy, and microhardness were investigated using electron backscatter diffraction, optical microscopy, tensile test machine, and microhardness tester. It was found that the graded steel is dense and free of cracks. The crystal structures of the as-built samples evolved in three grades from fcc structures to fcc + bcc structures and then to bcc + fcc structures. Samples in x and z directions showed obvious mechanical anisotropy. The samples machined in x direction showed higher strength and lower elongation than those machined in z direction due to the presence of lack-of-fusion pores and the higher metallurgical bonding between layers in the x direction. The microhardness of the as-built samples increased along the cross section from the substrate (159.7 HV) to the top surface (545.4 HV).