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随着海洋开采力度进一步扩大,产量丰富的海草海菖蒲走进了科学研究视野,研究价值逐渐提高。经查阅相关文献可知目前海菖蒲研究多集中在其生长分布、河床保护等方面,提取海菖蒲多糖的主要方法有微波辅助提取法、沸水提取法、酶解法、溶剂提取法和超声波辅助提取法等,新技术高压脉冲电场提取技术具有处理时间短、能耗低等优点。酶解法具有不引入杂质、实验条件比较温和等优点。故实验拟采用高压脉冲电场提取技术结合传统酶解法提取海菖蒲粗多糖,综合两种方法优点并用高效液相色谱法测定海菖蒲中粗多糖的含量,为海菖蒲多糖后续研究提供参考。 相似文献
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随着海洋开采力度进一步扩大,产量丰富的海草海菖蒲走进了科学研究视野,研究价值逐渐提高。经查阅相关文献可知目前海菖蒲研究多集中在其生长分布、河床保护等方面,提取海菖蒲多糖的主要方法有微波辅助提取法、沸水提取法、酶解法、溶剂提取法和超声波辅助提取法等。新技术高压脉冲电场提取技术具有处理时间短、能耗低等优点,酶解法具有不引入杂质、实验条件比较温和等优点。故实验拟采用高压脉冲电场提取技术结合传统酶解法提取海菖蒲粗多糖,综合两种方法优点并用高效液相色谱法测定海菖蒲中粗多糖的含量,为海菖蒲多糖后续研究提供参考。 相似文献
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以海带为原料,采取热水浴提取法探讨海带中可溶性粗多糖的提取方法,探究提取时间,提取温度,提取pH以及料液比对于多糖提取率的影响。通过单因素试验以及正交试验得出海带多糖提取工艺在料液比1g:40mL的条件下的最佳工艺组合为:提取温度80℃,提取时间4.5h,提取pH 8.0。在此最佳工艺组合下多糖提取率为5.41%。 相似文献
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BackgroundFor more than a decade, water-soluble, eco-friendly, biocompatible, and low-toxicity fluorescent nanomaterials have received considerable attention for their numerous in vivo and in vitro applications in biomedical imaging, disease diagnostics, and environmental monitoring. Owing to their tunable photoluminescence properties, carbon-based luminescent nanomaterials have shown great potential in bioimaging, photocatalysis, and biosensing among other applications.ResultsMarine environments provide excellent resources for the fabrication of these nanomaterials, because many marine organisms contain interesting trigger organic compounds that can be used as precursors. Herein, we synthesize multi-color emissive carbon dots (CDs) with an intrinsic photoluminescence quantum yield of 20.46%. These nanostructures were achieved through the one-step hydrothermal treatment of marine polysaccharide chondroitin sulfate, obtained from shark cartilage, in aqueous solution.ConclusionsWe successfully demonstrate the low toxicity of our marine resource-derived CDs in zebrafish, and provide an initial assessment of their possible use as a bioimaging agent. Notably, the newly synthesized CDs localize in the intestines of zebrafish larvae, thereby indicating their biocompatibility and potential use as in vivo dyes.How to cite: Kim KW, Choi TY, Kwon YM, et al. Simple synthesis of photoluminescent carbon dots from a marine polysaccharide found in shark cartilage. Electron J Biotechnol 2020;47. https://doi.org/10.1016/j.ejbt.2020.07.003. 相似文献
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Marcelo Bronzo Paulo Tarso Vilela de Resende Marcos Paulo Valadares de Oliveira Kevin P. McCormack Paulo Renato de Sousa Reinaldo Lopes Ferreira 《International Journal of Information Management》2013
How to align business analytics with process orientation initiatives and how management can influence a synergistic accomplishment of these two elements in order to streamline organizational performance is a foremost managerial issue. By means of a quantitative research effort, a study was designed to investigate the relationships among these constructs. Empirical data were collected in 2011 from a survey of 368 large and mid-sized industrial and service companies headquartered in Brazil. A quantitative analysis was performed, and both the reliability and validity of the scales were evaluated prior to using structural equation modeling. The results demonstrate that the direct effects among BPO, analytical indicators and performance can be taken as statistically significant. The findings also demonstrate that BPO and analytical indicators can be taken as predictors of performance. The paper discusses these results and their managerial implications, as well as some research paths for future studies on the topic. 相似文献
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《国家科学评论(英文版)》2014,(1)
he behavior of individual microscopic particles,such as an atom(or a photon),predicted using quantum mechanics,is dramatically diferent from the behavior of classical particles,such as a planet,determined using classical mechanics.How can the counter-intuitive behavior of the microscopic particle be veriied and manipulated experimentally?David Wineland and Serge Haroche,who were awarded the Nobel Priz in physics in 2012,developed a set of methods to isolate the ions and photons from their environment to create a genuine quantum system.Furthermore,they also developed methods to measure and manipulate these quantum systems,which open a path not only to explore the fundamental principles of quantum mechanics,but also to develop a much faster computer:a quantum computer. 相似文献
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Economic complexity and the green economy 总被引：1，自引：0，他引：1
《Research Policy》2022,51(8):103948
Which countries are likely to have the productive capabilities to thrive in the green economy? How might countries reorient their existing industrial structures to be more competitive in an environmentally friendly world? To investigate these questions, this paper develops a novel methodology for measuring productive capabilities to the green economy. By constructing a new comprehensive dataset of traded green products and drawing on economic complexity methods, we rank countries in terms of their ability to export complex green products competitively. We show that higher ranked countries are more likely to have higher environmental patenting rates, lower CO2 emissions, and more stringent environmental policies even after controlling for per capita GDP. We then examine countries' potential to transition into green products in the future and find strong path dependence in the accumulation of green capabilities. Our results shed new light on green industrialisation and have a number of implications for green industrial policy. 相似文献
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以具体工作中方差分析的两个例子,尝试回答方差教学中经常碰到的两个问题,(1)方差分析能解决什么问题;(2)怎样解释方差分析中F统计量的计算。通过教学过程两种讲授方法的比较,得出从样本数据分布的视角进行F统计量计算的教学方法效果更好。 相似文献
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黔东南苗族民间拥有许多优秀的传统手工艺形式,如何巧妙地引用这些优秀的民间手工艺进课堂是笔者这些年一直在努力的方向。本文从苗族传统手工艺银饰结合现代手工制作方法引入民族地区高师学前教育专业的手工课堂,试图开发一系列趣味手工教学资源,希望能通过此课堂让学生了解本苗族工艺文化的同时激发学生学习手工的兴趣,进而培养其动手能力,开拓思维,大胆创新。 相似文献
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短柄五加Eleutherococcus brachypus Harms种子为扁肾形,种皮由一层细胞构成。种子脱落时,胚
为心形胚期,胚周围的胚乳细胞解体形成液样囊腔,并包裹胚,胚细胞中存在较多蛋白质,胚乳细胞贮
存大量蛋白质颗粒和脂类,但两者均未见多糖颗粒。有萌发潜能的种子只占全部种子的9.27％。在试
验地种植条件下饱满种子经18～19个月后萌发,出苗率为1．67％,该过程细胞化学特点是胚细胞中蛋
白质含量逐渐减少,并逐渐积累少量多糖颗粒。种子经变温层积处理6个月即可完成后熟过程,其细胞
化学特点是胚细胞中蛋白质含量逐渐减少,但在心形胚后期即已积累大量多糖颗粒,并一直保持至胚
完全发育成熟。经比较短柄五加与刺五加的种子结构、后熟作用及其细胞化学特点,认为短柄五加种子质量差、自然状态下后熟时间长和出苗率低是短柄五加致濒的重要生殖因素,并提出了相应保护方法。 相似文献
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《Information processing & management》2022,59(1):102787
Since meta-paths have the innate ability to capture rich structure and semantic information, meta-path-based recommendations have gained tremendous attention in recent years. However, how to composite these multi-dimensional meta-paths? How to characterize their dynamic characteristics? How to automatically learn their priority and importance to capture users' diverse and personalized preferences at the user-level granularity? These issues are pivotal yet challenging for improving both the performance and the interpretability of recommendations. To address these challenges, we propose a personalized recommendation method via Multi-Dimensional Meta-Paths Temporal Graph Probabilistic Spreading (MD-MP-TGPS). Specifically, we first construct temporal multi-dimensional graphs with full consideration of the interest drift of users, obsolescence and popularity of items, and dynamic update of interaction behavior data. Then we propose a dimension-free temporal graph probabilistic spreading framework via multi-dimensional meta-paths. Moreover, to automatically learn the priority and importance of these multi-dimensional meta-paths at the user-level granularity, we propose two boosting strategies for personalized recommendation. Finally, we conduct comprehensive experiments on two real-world datasets and the experimental results show that the proposed MD-MP-TGPS method outperforms the compared state-of-the-art methods in such performance indicators as precision, recall, F1-score, hamming distance, intra-list diversity and popularity in terms of accuracy, diversity, and novelty. 相似文献
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怎样有效实施安全管理以防止安全事故频发是学术界和制造业不断探索的话题.本文利用学科形象思维上的共性,将安全管理与质量管理从各个方面进行对照探讨,加以借鉴并引以参证,从而为企业的安全管理提供思路和方法,同时主张企业内各个方面管理的集成化,以综合利用管理资源,节约管理成本,降低管理难度. 相似文献
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机器人是当代高技术发展的产物,它的产生和发展给社会生产带来了深刻的变革,已经成为当今世界各国竟相发展的高技术领域之一.二十一世纪的社会生产和人们生活将在机器人的全面参加下完成新的革命.我国机器人产业的发展状况如何?发展前景怎样?本文对这些问题进行了分析,并就产业化的模式作了初步探讨,预测了我国机器人产业的发展前景. 相似文献