The critical node(CN) is an important stage during seed aging, which is related to effective genebank conservation. Previous studies have demonstrated that proteins undergo carbonylated modification at the CN in rice,...The critical node(CN) is an important stage during seed aging, which is related to effective genebank conservation. Previous studies have demonstrated that proteins undergo carbonylated modification at the CN in rice, indicating oxidative damage. However, the levels of reactive carbonyl species(RCS) and the associated scavenging system at the CN are largely unknown. In this study, we optimized methods for the extraction and analysis of RCS from dry rice embryos. In order to acquire seeds at the CN, rice seeds were subjected to natural conditions for 7, 9, 11 and 13 months, and the seed germination rates were reduced to 90%, 82%, 71% and 57%, respectively. We chose the stage with seed germination rate of 82% as the CN according to the rice seed vigor loss curve. The levels of crotonaldehyde and 4-hydroxy-(E)-2-nonenal(HNE) were significantly increased at the CN. In addition, genes encoding carbonyl-scavenging enzyme, including Os ALDHs and Os AKRs, were significantly down-regulated at the CN, and reductions in the expression of Os ALDH2-2, Os ALDH2-5, Os ALDH3-4, Os ALDH7, Os AKR1 and Os AKR2 in particular could be responsible for RCS accumulation. Thus, the accumulations of crotonaldehyde and HNE and down-regulation of genes encoding carbonyl-scavenging enzyme might be related to an accelerating loss of seed viability at the CN.展开更多
Detection of community structures in the complex networks is significant to understand the network structures and analyze the network properties. However, it is still a problem on how to select initial seeds as well a...Detection of community structures in the complex networks is significant to understand the network structures and analyze the network properties. However, it is still a problem on how to select initial seeds as well as to determine the number of communities. In this paper, we proposed the detecting overlapping communities based on vital nodes algorithm（DOCBVA）, an algorithm based on vital nodes and initial seeds to detect overlapping communities. First, through some screening method, we find the vital nodes and then the seed communities through the pretreatment of vital nodes. This process differs from most existing methods, and the speed is faster. Then the seeds will be extended. We also adopt a new parameter of attribution degree to extend the seeds and find the overlapping communities. Finally, the remaining nodes that have not been processed in the first two steps will be reprocessed. The number of communities is likely to change until the end of algorithm. The experimental results using some real-world network data and artificial network data are satisfactory and can prove the superiority of the DOCBVA algorithm.展开更多
多标签分类在基因分类,药物发现和文本分类等实际问题中有着广泛的应用.已存在的多标签分类算法,通常都是从网络中随机的选取节点作为训练集.然而,在分类算法执行的过程中,网络中不同节点所起的作用不同.在给定训练集数目的情况下,选择...多标签分类在基因分类,药物发现和文本分类等实际问题中有着广泛的应用.已存在的多标签分类算法,通常都是从网络中随机的选取节点作为训练集.然而,在分类算法执行的过程中,网络中不同节点所起的作用不同.在给定训练集数目的情况下,选择的训练集不同,分类精度也会不同.所以我们引入了种子节点的概念,标签分类从种子节点开始,经过不断推理,得到网络中其他所有节点的标签.本文提出了SHDA(Nodes Selection of High Degree from Each Affiliation)算法,即从网络的每个社团中,按比例的选取度数较大的节点,然后将其合并,处理后得到种子节点.真实数据集上的实验表明,将种子节点用作训练集进行多标签分类,能够提升网络环境下多标签分类的准确率.展开更多
背景与目的:淋巴结转移是影响恶性肿瘤分期、治疗和预后的重要因素,恶性肿瘤经过综合治疗后残留淋巴结或新出现的转移淋巴结,往往治疗比较困难。本研究旨在评价CT导向下125I粒子植入治疗晚期肿瘤转移淋巴结的临床价值。方法:回顾性分析2...背景与目的:淋巴结转移是影响恶性肿瘤分期、治疗和预后的重要因素,恶性肿瘤经过综合治疗后残留淋巴结或新出现的转移淋巴结,往往治疗比较困难。本研究旨在评价CT导向下125I粒子植入治疗晚期肿瘤转移淋巴结的临床价值。方法:回顾性分析2003年11月至2007年4月中山大学肿瘤防治中心收治的47例经病理确诊为恶性肿瘤并接受经CT导向下125I粒子植入治疗的患者临床资料。转移淋巴结共计57枚,直径1.0～5.5cm;其中直径<2cm20枚(35.1%),≥2cm、<3cm21枚(36.8%),≥3cm、<4cm10枚(17.5%),≥4cm6枚(10.5%)。采用计算机立体定位计划系统(treatment plan system,TPS)计算布源,在CT导向下将(2.2～3.3)×107Mq活度的125I粒子相隔1.0～1.5cm平面播植。手术结束后1～3个月复查CT或PET-CT。结果:治疗前17例有疼痛症状的患者中13例于术后5～14d内疼痛缓解,有效率76.5%。47例患者中淋巴结完全缓解38例(80.9%),部分缓解4例(8.5%),无变化3例(6.4%),进展2例(4.3%),总有效率89.4%。主要的并发症为少量出血7例(14.9%)。结论:CT导向下125I粒子植入治疗恶性肿瘤转移淋巴结近期效果好,安全性高,创伤小,并发症发生率低。展开更多
基金supported by the National Key Technology R&D Program, China (Grant No. 2013BAD01B01)the National Natural Science Foundation of China Program (Grant Nos. 31371713 and 31401470)+1 种基金the Agricultural Science and Technology Innovation Program / Crop Germplasm Resources Preservation and Sharing Innovation Teamsupported by Central Laboratory of Biotechnology Research Institute, Chinese Academy of Agricultural Science
文摘The critical node(CN) is an important stage during seed aging, which is related to effective genebank conservation. Previous studies have demonstrated that proteins undergo carbonylated modification at the CN in rice, indicating oxidative damage. However, the levels of reactive carbonyl species(RCS) and the associated scavenging system at the CN are largely unknown. In this study, we optimized methods for the extraction and analysis of RCS from dry rice embryos. In order to acquire seeds at the CN, rice seeds were subjected to natural conditions for 7, 9, 11 and 13 months, and the seed germination rates were reduced to 90%, 82%, 71% and 57%, respectively. We chose the stage with seed germination rate of 82% as the CN according to the rice seed vigor loss curve. The levels of crotonaldehyde and 4-hydroxy-(E)-2-nonenal(HNE) were significantly increased at the CN. In addition, genes encoding carbonyl-scavenging enzyme, including Os ALDHs and Os AKRs, were significantly down-regulated at the CN, and reductions in the expression of Os ALDH2-2, Os ALDH2-5, Os ALDH3-4, Os ALDH7, Os AKR1 and Os AKR2 in particular could be responsible for RCS accumulation. Thus, the accumulations of crotonaldehyde and HNE and down-regulation of genes encoding carbonyl-scavenging enzyme might be related to an accelerating loss of seed viability at the CN.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61672124,61370145,61173183,and 61503375)the Password Theory Project of the 13th Five-Year Plan National Cryptography Development Fund,China(Grant No.MMJJ20170203)
文摘Detection of community structures in the complex networks is significant to understand the network structures and analyze the network properties. However, it is still a problem on how to select initial seeds as well as to determine the number of communities. In this paper, we proposed the detecting overlapping communities based on vital nodes algorithm（DOCBVA）, an algorithm based on vital nodes and initial seeds to detect overlapping communities. First, through some screening method, we find the vital nodes and then the seed communities through the pretreatment of vital nodes. This process differs from most existing methods, and the speed is faster. Then the seeds will be extended. We also adopt a new parameter of attribution degree to extend the seeds and find the overlapping communities. Finally, the remaining nodes that have not been processed in the first two steps will be reprocessed. The number of communities is likely to change until the end of algorithm. The experimental results using some real-world network data and artificial network data are satisfactory and can prove the superiority of the DOCBVA algorithm.
文摘多标签分类在基因分类,药物发现和文本分类等实际问题中有着广泛的应用.已存在的多标签分类算法,通常都是从网络中随机的选取节点作为训练集.然而,在分类算法执行的过程中,网络中不同节点所起的作用不同.在给定训练集数目的情况下,选择的训练集不同,分类精度也会不同.所以我们引入了种子节点的概念,标签分类从种子节点开始,经过不断推理,得到网络中其他所有节点的标签.本文提出了SHDA(Nodes Selection of High Degree from Each Affiliation)算法,即从网络的每个社团中,按比例的选取度数较大的节点,然后将其合并,处理后得到种子节点.真实数据集上的实验表明,将种子节点用作训练集进行多标签分类,能够提升网络环境下多标签分类的准确率.
文摘背景与目的:淋巴结转移是影响恶性肿瘤分期、治疗和预后的重要因素,恶性肿瘤经过综合治疗后残留淋巴结或新出现的转移淋巴结,往往治疗比较困难。本研究旨在评价CT导向下125I粒子植入治疗晚期肿瘤转移淋巴结的临床价值。方法:回顾性分析2003年11月至2007年4月中山大学肿瘤防治中心收治的47例经病理确诊为恶性肿瘤并接受经CT导向下125I粒子植入治疗的患者临床资料。转移淋巴结共计57枚,直径1.0～5.5cm;其中直径<2cm20枚(35.1%),≥2cm、<3cm21枚(36.8%),≥3cm、<4cm10枚(17.5%),≥4cm6枚(10.5%)。采用计算机立体定位计划系统(treatment plan system,TPS)计算布源,在CT导向下将(2.2～3.3)×107Mq活度的125I粒子相隔1.0～1.5cm平面播植。手术结束后1～3个月复查CT或PET-CT。结果:治疗前17例有疼痛症状的患者中13例于术后5～14d内疼痛缓解,有效率76.5%。47例患者中淋巴结完全缓解38例(80.9%),部分缓解4例(8.5%),无变化3例(6.4%),进展2例(4.3%),总有效率89.4%。主要的并发症为少量出血7例(14.9%)。结论:CT导向下125I粒子植入治疗恶性肿瘤转移淋巴结近期效果好,安全性高,创伤小,并发症发生率低。
