In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic...In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic(HRP-U),acid(HRP-C)and alkali(HRP-A)assisted extraction methods were investigated.The results demonstrated that extraction methods had significant effects on extraction yield,monosaccharide composition,molecular weight,particle size,triple-helical structure,and surface morphology of HRPs except for the major linkage bands.Thermogravimetric analysis showed that HRP-U with filamentous reticular microstructure exhibited better thermal stability.The HRP-A with the lowest molecular weight and highest arabinose content possessed the best antioxidant activities.Moreover,the rheological analysis indicated that HRPs with higher galacturonic acid content and molecular weight showed higher viscosity and stronger crosslinking network(HRP-C,HRP-W and HRP-U),which exhibited stronger bile acid binding capacity.The present findings provide scientific evidence in the preparation technology of sea buckthorn polysaccharides with good antioxidant and bile acid binding capacity which are related to the structure affected by the extraction methods.展开更多
目的探究miR-146通过调控Toll样受体4(TLR4)/核因子-κB(NF-κB)减少卵泡颗粒细胞凋亡和干预卵巢早衰(premature ovarian failure,,POF)的机制。方法野生小鼠实验:60只SPF级C57BL/6小鼠随机分为对照组(n=30)和POF组(n=30)。POF组建立卵...目的探究miR-146通过调控Toll样受体4(TLR4)/核因子-κB(NF-κB)减少卵泡颗粒细胞凋亡和干预卵巢早衰(premature ovarian failure,,POF)的机制。方法野生小鼠实验:60只SPF级C57BL/6小鼠随机分为对照组(n=30)和POF组(n=30)。POF组建立卵巢早衰模型,造模后15天qPCR检测2组小鼠卵巢组织中miRNA-146表达水平;基因敲除鼠实验:40只C57BL/6小鼠和20只miR-146敲除小鼠分为三组:对照组(n=20)、野生型POF组(n=20)和miR-146敲除POF组(n=20),野生型POF组和miR-146敲除POF组建立POF模型,建模后15天HE染色分析各组小鼠卵巢组织病理情况及原始卵泡、初级卵泡、次级卵泡和闭锁卵泡数,ELISA检测各组小鼠卵巢组织炎症信号通路分子TLR,NF-κB,肿瘤坏死因子α(TNF-α)和白介素6(IL-6)的表达水平;Western blot检测卵巢组织凋亡蛋白BCL2-Associated X蛋白(Bax),B淋巴细胞瘤-2基因(Bcl2)和TLR4信号通路蛋白TLR4,NF-κB表达水平。结果野生鼠实验表明与对照组相比,POF组小鼠卵泡中miR-146表达水平下调(0.51±0.14 vs 1.52±0.21),差异具有统计学意义(t=7.338,P<0.01);基因敲除鼠实验表明:与对照组相比,野生型POF组和miR-146敲除POF组原始卵泡(9.43±2.03,6.43±1.60 vs 16.82±2.11)、初级卵泡(6.15±1.11,5.01±1.10 vs 8.88±1.12)、次级卵泡(5.11±1.71,4.01±1.26 vs 7.11±1.34)均降低,闭锁卵泡(10.17±1.41,11.46±1.96 vs 7.18±1.64)升高,差异具有统计学意义(F=7.787,8.214,9.726,7.811,均P<0.01)。与对照组相比,野生鼠POF组和miR-146敲除POF组小鼠卵巢组织TLR4(68.18±5.92pg/ml,91.11±16.34 pg/ml vs 24.81±2.81 pg/ml),NF-κB(74.19±8.11 pg/ml,88.11±16.71pg/ml vs 68.18±5.92 pg/ml),TNF-α(72.81±2.10 pg/ml,94.31±2.26 pg/ml vs 28.07±3.67 pg/ml)和IL-6(69.19±7.11,81.11±16.34 vs 19.43±10.81 pg/ml)分泌显著升高,差异均有统计学意义(F=6.281,7.264,8.724,6.817,均P<0.01);与对照组相比,野生鼠POF组和miR-146敲除POF组小鼠卵巢组织Bax蛋白表达水平降低(1.18±0.19.0.61±0.14 vs1.81±0.21),Bcl2蛋白表达升高(0.59±0.05,0.91±0.05 vs 0.58±0.02),TLR4(1.10±0.12,0.41±0.04 vs 1.13±0.11)和NF-κB(0.81±0.02,0.31±0.06 vs 0.87±0.27)降低,差异均有显著性统计学意义(F=7.235,6.714,7.612,7.737,均P<0.01)。结论miR-146具有减少卵泡颗粒细胞凋亡的作用,其机制可能与TLR4/NF-κB信号通路的调控和抑制炎症因子的释放相关。展开更多
Natural foods,such as whole pulses,are recommended in the dietary guidelines of the US and China.The plant cell wall structure in whole pulses has important implications for the nutritional functionalities of starch.I...Natural foods,such as whole pulses,are recommended in the dietary guidelines of the US and China.The plant cell wall structure in whole pulses has important implications for the nutritional functionalities of starch.In this study,garbanzo bean cells with varying degrees of cell wall integrity were subjected to dry heat treatment(DHT)and used to elucidate the food structure-starch digestion properties of pulse food.The morphological features suggested that all cell samples do not exhibit remarkable changes after being subjected to DHT.Molecular rearrangement and the crystallite disruption of starch granules entrapped in cells occurred during DHT as assessed by the crystal structure and thermal properties.DHT decreased the inhibitory effects of enzymes of both the soluble and insoluble components,but the digestion rate and extent of slightly and highly damaged cell samples did not exhibit significant differences compared with their native counterparts.We concluded that the starch digestion of pulse cotyledon cells is primarily determined by the intactness of the cellular structure.This study reveals the role of food structure on the ability to retain the desirable nutritional properties of starch after subjection to physical modification.展开更多
Risk assessment is essential for the safe and reliable operation of cyber physical power system. Traditional security risk assessment methods do not take integration of cyber system and physical system of power grid i...Risk assessment is essential for the safe and reliable operation of cyber physical power system. Traditional security risk assessment methods do not take integration of cyber system and physical system of power grid into account. In order to solve this problem, security risk assessment algorithm of cyber physical power system based on rough set and gene expression programming is proposed. Firstly, fast attribution reduction based on binary search algorithm is presented. Secondly, security risk assessment function for cyber physical power system is mined based on gene expression programming. Lastly, security risk levels of cyber physical power system are predicted and analyzed by the above function model. Experimental results show that security risk assessment function model based on the proposed algorithm has high efficiency of function mining, accuracy of security risk level prediction and strong practicality.展开更多
Cloud computing represents a novel computing model in the contemporary technology world. In a cloud system, the com- puting power of virtual machines (VMs) and network status can greatly affect the completion time o...Cloud computing represents a novel computing model in the contemporary technology world. In a cloud system, the com- puting power of virtual machines (VMs) and network status can greatly affect the completion time of data intensive tasks. How- ever, most of the current resource allocation policies focus only on network conditions and physical hosts. And the computing power of VMs is largely ignored. This paper proposes a comprehensive resource allocation policy which consists of a data intensive task scheduling algorithm that takes account of computing power of VMs and a VM allocation policy that considers bandwidth between storage nodes and hosts. The VM allocation policy includes VM placement and VM migration algorithms. Related simulations show that the proposed algorithms can greatly reduce the task comple- tion time and keep good load balance of physical hosts at the same time.展开更多
To address the problem of privacy disclosure during data mining, a new privacy-preserving decision tree classification construction model based on a differential privacy-protection mechanism is presented. An efficient...To address the problem of privacy disclosure during data mining, a new privacy-preserving decision tree classification construction model based on a differential privacy-protection mechanism is presented. An efficient classifier that uses feedback to add two types of noise via Laplace and exponential mechanisms to perturb the calculation results are introduced to the construction algorithm that provides a secure data access interface for users. Different split solutions for attributes of continuous and discrete values are provided and used to optimize the search scheme to reduce the error rate of the classifier. By choosing an available quality function with lower sensitivity for making decisions and improving the privacy budget allocation methods, the algorithm effectively resists malicious attacks that depend on the background knowledge. The potential problem of obtaining personal information by guessing unknown sensitive nodes of tree-type data is solved correspondingly. The better privacy preservation and accuracy of this new algorithm are shown by simulation experiments. ? 1990-2011 Beijing Institute of Aerospace Information.展开更多
基金The Guangdong Basic and Applied Basic Research Foundation(2022A1515010730)National Natural Science Foundation of China(32001647)+2 种基金National Natural Science Foundation of China(31972022)Financial and moral assistance supported by the Guangdong Basic and Applied Basic Research Foundation(2019A1515011996)111 Project(B17018)。
文摘In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic(HRP-U),acid(HRP-C)and alkali(HRP-A)assisted extraction methods were investigated.The results demonstrated that extraction methods had significant effects on extraction yield,monosaccharide composition,molecular weight,particle size,triple-helical structure,and surface morphology of HRPs except for the major linkage bands.Thermogravimetric analysis showed that HRP-U with filamentous reticular microstructure exhibited better thermal stability.The HRP-A with the lowest molecular weight and highest arabinose content possessed the best antioxidant activities.Moreover,the rheological analysis indicated that HRPs with higher galacturonic acid content and molecular weight showed higher viscosity and stronger crosslinking network(HRP-C,HRP-W and HRP-U),which exhibited stronger bile acid binding capacity.The present findings provide scientific evidence in the preparation technology of sea buckthorn polysaccharides with good antioxidant and bile acid binding capacity which are related to the structure affected by the extraction methods.
文摘目的探究miR-146通过调控Toll样受体4(TLR4)/核因子-κB(NF-κB)减少卵泡颗粒细胞凋亡和干预卵巢早衰(premature ovarian failure,,POF)的机制。方法野生小鼠实验:60只SPF级C57BL/6小鼠随机分为对照组(n=30)和POF组(n=30)。POF组建立卵巢早衰模型,造模后15天qPCR检测2组小鼠卵巢组织中miRNA-146表达水平;基因敲除鼠实验:40只C57BL/6小鼠和20只miR-146敲除小鼠分为三组:对照组(n=20)、野生型POF组(n=20)和miR-146敲除POF组(n=20),野生型POF组和miR-146敲除POF组建立POF模型,建模后15天HE染色分析各组小鼠卵巢组织病理情况及原始卵泡、初级卵泡、次级卵泡和闭锁卵泡数,ELISA检测各组小鼠卵巢组织炎症信号通路分子TLR,NF-κB,肿瘤坏死因子α(TNF-α)和白介素6(IL-6)的表达水平;Western blot检测卵巢组织凋亡蛋白BCL2-Associated X蛋白(Bax),B淋巴细胞瘤-2基因(Bcl2)和TLR4信号通路蛋白TLR4,NF-κB表达水平。结果野生鼠实验表明与对照组相比,POF组小鼠卵泡中miR-146表达水平下调(0.51±0.14 vs 1.52±0.21),差异具有统计学意义(t=7.338,P<0.01);基因敲除鼠实验表明:与对照组相比,野生型POF组和miR-146敲除POF组原始卵泡(9.43±2.03,6.43±1.60 vs 16.82±2.11)、初级卵泡(6.15±1.11,5.01±1.10 vs 8.88±1.12)、次级卵泡(5.11±1.71,4.01±1.26 vs 7.11±1.34)均降低,闭锁卵泡(10.17±1.41,11.46±1.96 vs 7.18±1.64)升高,差异具有统计学意义(F=7.787,8.214,9.726,7.811,均P<0.01)。与对照组相比,野生鼠POF组和miR-146敲除POF组小鼠卵巢组织TLR4(68.18±5.92pg/ml,91.11±16.34 pg/ml vs 24.81±2.81 pg/ml),NF-κB(74.19±8.11 pg/ml,88.11±16.71pg/ml vs 68.18±5.92 pg/ml),TNF-α(72.81±2.10 pg/ml,94.31±2.26 pg/ml vs 28.07±3.67 pg/ml)和IL-6(69.19±7.11,81.11±16.34 vs 19.43±10.81 pg/ml)分泌显著升高,差异均有统计学意义(F=6.281,7.264,8.724,6.817,均P<0.01);与对照组相比,野生鼠POF组和miR-146敲除POF组小鼠卵巢组织Bax蛋白表达水平降低(1.18±0.19.0.61±0.14 vs1.81±0.21),Bcl2蛋白表达升高(0.59±0.05,0.91±0.05 vs 0.58±0.02),TLR4(1.10±0.12,0.41±0.04 vs 1.13±0.11)和NF-κB(0.81±0.02,0.31±0.06 vs 0.87±0.27)降低,差异均有显著性统计学意义(F=7.235,6.714,7.612,7.737,均P<0.01)。结论miR-146具有减少卵泡颗粒细胞凋亡的作用,其机制可能与TLR4/NF-κB信号通路的调控和抑制炎症因子的释放相关。
基金the National Natural Science Foundation of China(31701546)the Fundamental Research Funds for the Central Universities of China(2019ZD40)+5 种基金the 111 Project(B17018)for financial supportPearl River Talent Recruitment Program of Guangdong Province(2017GC010229)the Pearl River Nova Program of Guangzhou(201906010079)the National Natural Science Foundation of China(32001691)the special fund for scientific innovation strategyconstruction of high-level academy of agriculture science(R2019YJYB1001)the Application-oriented Projects of Guangdong Province(2017B020232002)。
文摘Natural foods,such as whole pulses,are recommended in the dietary guidelines of the US and China.The plant cell wall structure in whole pulses has important implications for the nutritional functionalities of starch.In this study,garbanzo bean cells with varying degrees of cell wall integrity were subjected to dry heat treatment(DHT)and used to elucidate the food structure-starch digestion properties of pulse food.The morphological features suggested that all cell samples do not exhibit remarkable changes after being subjected to DHT.Molecular rearrangement and the crystallite disruption of starch granules entrapped in cells occurred during DHT as assessed by the crystal structure and thermal properties.DHT decreased the inhibitory effects of enzymes of both the soluble and insoluble components,but the digestion rate and extent of slightly and highly damaged cell samples did not exhibit significant differences compared with their native counterparts.We concluded that the starch digestion of pulse cotyledon cells is primarily determined by the intactness of the cellular structure.This study reveals the role of food structure on the ability to retain the desirable nutritional properties of starch after subjection to physical modification.
基金support by National Natural Science Foundation of China(61202354,51507084)Nanjing University of Post and Telecommunications Science Foundation(NUPTSF)(NT214203)
文摘Risk assessment is essential for the safe and reliable operation of cyber physical power system. Traditional security risk assessment methods do not take integration of cyber system and physical system of power grid into account. In order to solve this problem, security risk assessment algorithm of cyber physical power system based on rough set and gene expression programming is proposed. Firstly, fast attribution reduction based on binary search algorithm is presented. Secondly, security risk assessment function for cyber physical power system is mined based on gene expression programming. Lastly, security risk levels of cyber physical power system are predicted and analyzed by the above function model. Experimental results show that security risk assessment function model based on the proposed algorithm has high efficiency of function mining, accuracy of security risk level prediction and strong practicality.
基金supported by the National Natural Science Foundation of China(6120235461272422)the Scientific and Technological Support Project(Industry)of Jiangsu Province(BE2011189)
文摘Cloud computing represents a novel computing model in the contemporary technology world. In a cloud system, the com- puting power of virtual machines (VMs) and network status can greatly affect the completion time of data intensive tasks. How- ever, most of the current resource allocation policies focus only on network conditions and physical hosts. And the computing power of VMs is largely ignored. This paper proposes a comprehensive resource allocation policy which consists of a data intensive task scheduling algorithm that takes account of computing power of VMs and a VM allocation policy that considers bandwidth between storage nodes and hosts. The VM allocation policy includes VM placement and VM migration algorithms. Related simulations show that the proposed algorithms can greatly reduce the task comple- tion time and keep good load balance of physical hosts at the same time.
基金supported by the National Natural Science Foundation of China(6137301761402241+4 种基金615722606157226161472192)the Scientific&Technological Support Project of Jiangsu Province(BE2014718BE2015702)
文摘To address the problem of privacy disclosure during data mining, a new privacy-preserving decision tree classification construction model based on a differential privacy-protection mechanism is presented. An efficient classifier that uses feedback to add two types of noise via Laplace and exponential mechanisms to perturb the calculation results are introduced to the construction algorithm that provides a secure data access interface for users. Different split solutions for attributes of continuous and discrete values are provided and used to optimize the search scheme to reduce the error rate of the classifier. By choosing an available quality function with lower sensitivity for making decisions and improving the privacy budget allocation methods, the algorithm effectively resists malicious attacks that depend on the background knowledge. The potential problem of obtaining personal information by guessing unknown sensitive nodes of tree-type data is solved correspondingly. The better privacy preservation and accuracy of this new algorithm are shown by simulation experiments. ? 1990-2011 Beijing Institute of Aerospace Information.