Technically, it begins next week. Actually, itbegan with the epic sigh of relief that could besensed all over the U. S. right after Labor Day.Even before it arrives, Americans always manageto get into autumn. And no w...Technically, it begins next week. Actually, itbegan with the epic sigh of relief that could besensed all over the U. S. right after Labor Day.Even before it arrives, Americans always manageto get into autumn. And no wonder. It is easilythe most habitable season of the year. Indeed, autumn deserves a hymn - and ithas received far less tribute than it deserves. True,some mixed notices have come in over the cen-turies. Horace slandered autumn as a "dread" peri-od - "harvest-season of the Goddess of Death."展开更多
目的:比较采用充填器与HAWE牙体颈部成型片对楔状缺损牙进行光固化复合树脂充填成型治疗后充填体边缘微渗漏情况。方法:取新鲜离体双尖牙40颗,在颊侧颈部釉牙骨质界处制备标准V类(3mm×2mm×2mm)洞型,随机分成2组,A组采用不锈...目的:比较采用充填器与HAWE牙体颈部成型片对楔状缺损牙进行光固化复合树脂充填成型治疗后充填体边缘微渗漏情况。方法:取新鲜离体双尖牙40颗,在颊侧颈部釉牙骨质界处制备标准V类(3mm×2mm×2mm)洞型,随机分成2组,A组采用不锈钢两头扁充填器,B组采用颈部成型片行复合树脂充填治疗。样本经冷热循环后,在2%亚甲基蓝溶液中染色24h,将充填体正中颊舌向纵行剖开,立体显微镜下观察修复体边缘染色情况,采用Image-Pro plus 6.0图像分析软件测量微渗漏深度。结果:两种方法均有微渗漏现象发生,A组边缘微渗漏深度为(0.641±0.370)mm,B组边缘微渗漏深度为(0.395±0.462)mm。两种方法树脂充填后边缘微渗漏程度及深度差异均有统计学意义(P<0.05)。结论:虽然两种方法均不能消除充填体边缘微渗漏,但用颈部成型片的边缘封闭性明显优于传统充填器,而且操作简单,方便,节省时间,适合临床推广。展开更多
对热水提取米邦塔仙人掌(Opuntia milpa alta Haw)粗多糖的提取工艺进行研究。以新鲜米邦塔仙人掌为原料,采用单因素试验考察料液比、提取温度、提取时间和提取次数对米邦塔仙人掌粗多糖得率的影响,并通过响应面法优化工艺参数。结果表...对热水提取米邦塔仙人掌(Opuntia milpa alta Haw)粗多糖的提取工艺进行研究。以新鲜米邦塔仙人掌为原料,采用单因素试验考察料液比、提取温度、提取时间和提取次数对米邦塔仙人掌粗多糖得率的影响,并通过响应面法优化工艺参数。结果表明,影响粗多糖得率的因素主次顺序为提取温度>料液比>提取时间。确定最佳提取工艺参数为提取温度83℃,料液比1∶28(g∶m L),提取时间为3 h,在此条件下,仙人掌粗多糖的得率为2.05%。展开更多
在黑龙江省东南部地区的海林市进行紫斑牡丹[Paeonia rockii(S.G.Haw et L.A.Lauener)T.Hong et J.J.Li]苗木的栽培试验,连续3年对紫斑牡丹的生长发育表现、物候期进行了观测,采用不同防寒措施进行对比试验。结果表明,紫斑牡丹苗木部分...在黑龙江省东南部地区的海林市进行紫斑牡丹[Paeonia rockii(S.G.Haw et L.A.Lauener)T.Hong et J.J.Li]苗木的栽培试验,连续3年对紫斑牡丹的生长发育表现、物候期进行了观测,采用不同防寒措施进行对比试验。结果表明,紫斑牡丹苗木部分植株地下根系不做防寒处理能正常越冬,但地上枝条冻害严重,保存率逐年降低,长势弱,每年生长量不明显;物候期与原产地相比均较晚;采用不同防寒措施对其萌芽期和始花期影响较大,对其成活率也有一定影响。展开更多
A reserved-phase HPLC method was developed for the determination of barbaloin in Aloe vera L. var. chinensis (Haw.) Berger and Aloe barbadensis Miller, and whether there was a close relationship between the contents o...A reserved-phase HPLC method was developed for the determination of barbaloin in Aloe vera L. var. chinensis (Haw.) Berger and Aloe barbadensis Miller, and whether there was a close relationship between the contents of barbaloin and their environments in which they were growing was decided. A Hypersil ODS column (4.6 mm×200 mm, 5 μm)was used with a mobile phase of methanol-water (40:60, containing 0.1% acetic acid), the flow rate being 1.0 mL·min -1, detection wavelength at 359 nm, and the column temperature being 30℃. The linear range of barbaloin was between 0.0726 and 0.726 μg with a correlation coefficient of 0.9998 and the regression equation being Y=1.9202×10 6X-1801.9. Barbaloin was stable in methanol in 48 h and the instrument precision was 1.2% while the method precision was 4.9%. The contents of barbaloin of 12 samples ranged from 6.160 to 319.1 μg·g -1. The method developed was fast and simple with good reproducibility. There was high correlation between the contents of barbaloin and their growing environments.展开更多
Dear Editor： Therapeutically active metabolite contents in a med- icinal plant vary in nature, which may impact on its therapeutic efficacy. Bergenia （Saxifragaceae） is an evergreen perennial herb widely distribut...Dear Editor： Therapeutically active metabolite contents in a med- icinal plant vary in nature, which may impact on its therapeutic efficacy. Bergenia （Saxifragaceae） is an evergreen perennial herb widely distributed in Central and East Asia with about 30 species reported worldwide. It grows at a range of altitudes from the Khasia hills at 400 feet to the temperate Himalayas from Kashmir to Bhutan at 7,000-10,000 feet. Its distribution over a wide range of altitudinal zones makes it a good candidate for studying variations in its metabolic profiles under different climatic conditions. Bergenin （C-glycoside of 4-O-methyl gallic acid） has been identified as a potent active secondary metabolite in Bergenia and other therapeutically active constituents including, among others, gallic acid （3,4,5 trihydroxybenzoic acid）, （＋） catechin, and gallicin （Fig. 1）.展开更多
Three novel acidic polysaccharide fractions(OFPP-1,OFPP-2,OFPP-3)with different m olecular weights(803.7,555.1 and 414.5 k Da)were isolated from the peeled Opuntia dillenii Haw.fruits by alkali-extraction,graded alcoh...Three novel acidic polysaccharide fractions(OFPP-1,OFPP-2,OFPP-3)with different m olecular weights(803.7,555.1 and 414.5 k Da)were isolated from the peeled Opuntia dillenii Haw.fruits by alkali-extraction,graded alcohol precipitation and column chromatography.Structural analysis indicated that OFPPs were pectic polysaccharides consisting of rhamnose,arabinose and galactose residues.The backbone of OFPP-1 consisted of a repeating unit→6-α-D-Galp A-(1→2)-α-L-Rhap-(1→with T-α-D-Galp A-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→,T-β-D-Xylp-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→or T-α-D-Galp A-(1→3)-α-L-Araf-(1→as the side chains.The backbone of OFPP-2 consisted of a disaccharide repeating unit→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→with T-β-L-Araf-(1→as the branches substituted at the O-4 position of→2,4)-α-LRhap-(1→.Whereas the backbone of OFPP-3 was→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→3)-β-L-Araf-(1→or→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→,which was branched at the O-4 position of→2,4)-α-L-Rhap-(1→.Moreover,these three polysaccharide fractions could protect Huh-7 cells against H2O2-induced oxidative stress to different extents by decreasing the MDA content and increasing the SOD,CAT,GSH-Px activities and the GSH level in the Huh-7 cells.These results suggest that OFPPs have the potential to be used as natural antioxidants.展开更多
Objective： To investigate the effect of total flavone of haw leaves（TFHL） on the expression of nuclear factor erythroid-2 related factor（Nrf2） and other related factors in nonalcoholic steatohepatitis（NASH） rat...Objective： To investigate the effect of total flavone of haw leaves（TFHL） on the expression of nuclear factor erythroid-2 related factor（Nrf2） and other related factors in nonalcoholic steatohepatitis（NASH） rats induced by high-fat diet and then to further discuss the mechanism of TFHL＇s prevention against NASH. Methods： High-fat diet was fed to 40 rats to establish the NASH model. Then model rats were intragastrically administrated with 40, 80, 160 mg/（kg·day） TFHL, respectively. The pathological changes of liver tissues in NASH rats were detected by oil red O and hematoxylin-eosin（HE） stainings. The expression of Nrf2 in rat liver was examined through immunohistochemistry. The level of 8-iso-prostaglandin F2α in serum was detected through enzyme linked immunosorbent assay（ELISA）. The mR NA and protein levels of Nrf2 and other related factors in liver tissue were measured by real-time reverse transcriptionpolymerase chain reaction and western blot. Results： Lipid deposition, hepatic steatosis, focal necrosis in lobular inflammation and ballooning degeneration were emerged in livers of NASH rats. The 8-iso-prostaglandin F2α in the serum of NASH rats increased significantly compared with the control group（P〈0.05）. The mR NA of Nrf2, hemeoxyenase1（HO-1） and the mR NA and protein levels of quinine oxidoreductase（NQO1） in NASH rats liver tissue showed a striking increase, while the mR NA levels of Keap1, r-glutamylcysteine synthethase（rG CS） and glutathione S-transferase（GST） were significantly decreased compared with the control group（P〈0.05）. After TFHL treatment, 8-iso-prostaglandin F2α level in serum significantly decreased, and Nrf2 mR NA and protein levels in hepatocytes nucleus enhanced compared with the model group（P〈0.05 or 0.01）. Meanwhile the Keap1 mR NA, the mR NA and protein levels of HO-1, NQO1 antibody, rG CS antibody, GST increased after TFHL treatment（P〈0.05 or 0.01）. Conclusions： Nrf2 and other related factors were involved in development of NASH, and they also served as an important part in its occurrence. By regulating expression of Nrf2 and other related factors, TFHL may play a role in antioxidative stress and prevention of NASH.展开更多
This study investigates the in vitro degradation of calcium-deficient hydroxyapatite powder after heat treatment at different temperatures and analyzes the calculated phase composition,particle size distribution,degra...This study investigates the in vitro degradation of calcium-deficient hydroxyapatite powder after heat treatment at different temperatures and analyzes the calculated phase composition,particle size distribution,degradation rate,and bioactivity of the powder after heat treatment.A mixture of hydroxyapatite and𝛽-tricalcium phosphate(BCP)coatings was prepared on the surface of a 3D-printed hydroxyapatite-whisker-strengthened hydroxyapatite scaf-fold(HAw/HA)by vacuum impregnation and ultraviolet light curing combined with an optimized heat treatment process.The performance of the coatings under different methods was characterized.The composite scaffolds with highly interconnected pores and excellent mechanical properties were prepared,and their biodegradation performance,bioactivity,osteoconductivity,and osteoinductivity of the scaffolds were improved.The results showed that calcium-deficient hydroxyapatite began to transform into BCP between 600℃and 800℃,and the powder treated at 800℃has better bioactivity.The BCP coating prepared by light curing was more uniform,resulting in a higher interfacial bonding strength,and has better osteoconductivity and osteoinductivity than that prepared by vacuum impregnation.展开更多
A study group from People’s University of Chinaconducted a sample survey to find out how people livingin cities spend their time. They visited 4,876 people agedfrom 15 to 75 in 40 cities at their homes and asked them...A study group from People’s University of Chinaconducted a sample survey to find out how people livingin cities spend their time. They visited 4,876 people agedfrom 15 to 75 in 40 cities at their homes and asked themto fill in questionnaires. The following is what they foundout about how much sleep urban people get.展开更多
文摘Technically, it begins next week. Actually, itbegan with the epic sigh of relief that could besensed all over the U. S. right after Labor Day.Even before it arrives, Americans always manageto get into autumn. And no wonder. It is easilythe most habitable season of the year. Indeed, autumn deserves a hymn - and ithas received far less tribute than it deserves. True,some mixed notices have come in over the cen-turies. Horace slandered autumn as a "dread" peri-od - "harvest-season of the Goddess of Death."
文摘目的:比较采用充填器与HAWE牙体颈部成型片对楔状缺损牙进行光固化复合树脂充填成型治疗后充填体边缘微渗漏情况。方法:取新鲜离体双尖牙40颗,在颊侧颈部釉牙骨质界处制备标准V类(3mm×2mm×2mm)洞型,随机分成2组,A组采用不锈钢两头扁充填器,B组采用颈部成型片行复合树脂充填治疗。样本经冷热循环后,在2%亚甲基蓝溶液中染色24h,将充填体正中颊舌向纵行剖开,立体显微镜下观察修复体边缘染色情况,采用Image-Pro plus 6.0图像分析软件测量微渗漏深度。结果:两种方法均有微渗漏现象发生,A组边缘微渗漏深度为(0.641±0.370)mm,B组边缘微渗漏深度为(0.395±0.462)mm。两种方法树脂充填后边缘微渗漏程度及深度差异均有统计学意义(P<0.05)。结论:虽然两种方法均不能消除充填体边缘微渗漏,但用颈部成型片的边缘封闭性明显优于传统充填器,而且操作简单,方便,节省时间,适合临床推广。
文摘在黑龙江省东南部地区的海林市进行紫斑牡丹[Paeonia rockii(S.G.Haw et L.A.Lauener)T.Hong et J.J.Li]苗木的栽培试验,连续3年对紫斑牡丹的生长发育表现、物候期进行了观测,采用不同防寒措施进行对比试验。结果表明,紫斑牡丹苗木部分植株地下根系不做防寒处理能正常越冬,但地上枝条冻害严重,保存率逐年降低,长势弱,每年生长量不明显;物候期与原产地相比均较晚;采用不同防寒措施对其萌芽期和始花期影响较大,对其成活率也有一定影响。
文摘A reserved-phase HPLC method was developed for the determination of barbaloin in Aloe vera L. var. chinensis (Haw.) Berger and Aloe barbadensis Miller, and whether there was a close relationship between the contents of barbaloin and their environments in which they were growing was decided. A Hypersil ODS column (4.6 mm×200 mm, 5 μm)was used with a mobile phase of methanol-water (40:60, containing 0.1% acetic acid), the flow rate being 1.0 mL·min -1, detection wavelength at 359 nm, and the column temperature being 30℃. The linear range of barbaloin was between 0.0726 and 0.726 μg with a correlation coefficient of 0.9998 and the regression equation being Y=1.9202×10 6X-1801.9. Barbaloin was stable in methanol in 48 h and the instrument precision was 1.2% while the method precision was 4.9%. The contents of barbaloin of 12 samples ranged from 6.160 to 319.1 μg·g -1. The method developed was fast and simple with good reproducibility. There was high correlation between the contents of barbaloin and their growing environments.
文摘Dear Editor： Therapeutically active metabolite contents in a med- icinal plant vary in nature, which may impact on its therapeutic efficacy. Bergenia （Saxifragaceae） is an evergreen perennial herb widely distributed in Central and East Asia with about 30 species reported worldwide. It grows at a range of altitudes from the Khasia hills at 400 feet to the temperate Himalayas from Kashmir to Bhutan at 7,000-10,000 feet. Its distribution over a wide range of altitudinal zones makes it a good candidate for studying variations in its metabolic profiles under different climatic conditions. Bergenin （C-glycoside of 4-O-methyl gallic acid） has been identified as a potent active secondary metabolite in Bergenia and other therapeutically active constituents including, among others, gallic acid （3,4,5 trihydroxybenzoic acid）, （＋） catechin, and gallicin （Fig. 1）.
基金supported by the National Natural Science Foundation of China(No.31972977)。
文摘Three novel acidic polysaccharide fractions(OFPP-1,OFPP-2,OFPP-3)with different m olecular weights(803.7,555.1 and 414.5 k Da)were isolated from the peeled Opuntia dillenii Haw.fruits by alkali-extraction,graded alcohol precipitation and column chromatography.Structural analysis indicated that OFPPs were pectic polysaccharides consisting of rhamnose,arabinose and galactose residues.The backbone of OFPP-1 consisted of a repeating unit→6-α-D-Galp A-(1→2)-α-L-Rhap-(1→with T-α-D-Galp A-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→,T-β-D-Xylp-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→or T-α-D-Galp A-(1→3)-α-L-Araf-(1→as the side chains.The backbone of OFPP-2 consisted of a disaccharide repeating unit→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→with T-β-L-Araf-(1→as the branches substituted at the O-4 position of→2,4)-α-LRhap-(1→.Whereas the backbone of OFPP-3 was→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→3)-β-L-Araf-(1→or→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→,which was branched at the O-4 position of→2,4)-α-L-Rhap-(1→.Moreover,these three polysaccharide fractions could protect Huh-7 cells against H2O2-induced oxidative stress to different extents by decreasing the MDA content and increasing the SOD,CAT,GSH-Px activities and the GSH level in the Huh-7 cells.These results suggest that OFPPs have the potential to be used as natural antioxidants.
基金Supported by the Zhejiang Provincial Natural Science Foundation(No.LY12H29001)Comparative Medicine Innovation Team of Zhejiang Chinese Medical University(No.XTD201301)
文摘Objective： To investigate the effect of total flavone of haw leaves（TFHL） on the expression of nuclear factor erythroid-2 related factor（Nrf2） and other related factors in nonalcoholic steatohepatitis（NASH） rats induced by high-fat diet and then to further discuss the mechanism of TFHL＇s prevention against NASH. Methods： High-fat diet was fed to 40 rats to establish the NASH model. Then model rats were intragastrically administrated with 40, 80, 160 mg/（kg·day） TFHL, respectively. The pathological changes of liver tissues in NASH rats were detected by oil red O and hematoxylin-eosin（HE） stainings. The expression of Nrf2 in rat liver was examined through immunohistochemistry. The level of 8-iso-prostaglandin F2α in serum was detected through enzyme linked immunosorbent assay（ELISA）. The mR NA and protein levels of Nrf2 and other related factors in liver tissue were measured by real-time reverse transcriptionpolymerase chain reaction and western blot. Results： Lipid deposition, hepatic steatosis, focal necrosis in lobular inflammation and ballooning degeneration were emerged in livers of NASH rats. The 8-iso-prostaglandin F2α in the serum of NASH rats increased significantly compared with the control group（P〈0.05）. The mR NA of Nrf2, hemeoxyenase1（HO-1） and the mR NA and protein levels of quinine oxidoreductase（NQO1） in NASH rats liver tissue showed a striking increase, while the mR NA levels of Keap1, r-glutamylcysteine synthethase（rG CS） and glutathione S-transferase（GST） were significantly decreased compared with the control group（P〈0.05）. After TFHL treatment, 8-iso-prostaglandin F2α level in serum significantly decreased, and Nrf2 mR NA and protein levels in hepatocytes nucleus enhanced compared with the model group（P〈0.05 or 0.01）. Meanwhile the Keap1 mR NA, the mR NA and protein levels of HO-1, NQO1 antibody, rG CS antibody, GST increased after TFHL treatment（P〈0.05 or 0.01）. Conclusions： Nrf2 and other related factors were involved in development of NASH, and they also served as an important part in its occurrence. By regulating expression of Nrf2 and other related factors, TFHL may play a role in antioxidative stress and prevention of NASH.
基金supported by Natural Science Foundation of China(Grant Nos.51972268 and 81860384).
文摘This study investigates the in vitro degradation of calcium-deficient hydroxyapatite powder after heat treatment at different temperatures and analyzes the calculated phase composition,particle size distribution,degradation rate,and bioactivity of the powder after heat treatment.A mixture of hydroxyapatite and𝛽-tricalcium phosphate(BCP)coatings was prepared on the surface of a 3D-printed hydroxyapatite-whisker-strengthened hydroxyapatite scaf-fold(HAw/HA)by vacuum impregnation and ultraviolet light curing combined with an optimized heat treatment process.The performance of the coatings under different methods was characterized.The composite scaffolds with highly interconnected pores and excellent mechanical properties were prepared,and their biodegradation performance,bioactivity,osteoconductivity,and osteoinductivity of the scaffolds were improved.The results showed that calcium-deficient hydroxyapatite began to transform into BCP between 600℃and 800℃,and the powder treated at 800℃has better bioactivity.The BCP coating prepared by light curing was more uniform,resulting in a higher interfacial bonding strength,and has better osteoconductivity and osteoinductivity than that prepared by vacuum impregnation.
文摘A study group from People’s University of Chinaconducted a sample survey to find out how people livingin cities spend their time. They visited 4,876 people agedfrom 15 to 75 in 40 cities at their homes and asked themto fill in questionnaires. The following is what they foundout about how much sleep urban people get.
