Guazia,the earliest ovule without cupule but with unique integumentary lobes

The earliest ovules in the Late Devonian (Famennian) are surrounded by a cupule that is involved in both protection and pollination, and generally have free integumentary lobes. Here we report a new taxon from the Famennian of China, Guazia dongzhiensis gen. et sp. nov. The terminally borne ovule is apparently acupulate (without cupule) and has four radially arranged wing-like integumentary lobes that are extensively fused, and folded lengthwise and inwards. Guazia provides evidence that not all Devonian seeds possess a cupule and it increases their diversity in integumentary lobes. This genus also suggests that the integuments develop new functions, probably including wind dispersal at the expense of the cupules.     

不同施肥处理对稻田系统氮素流失的影响

通过测坑定位试验,研究了3种施肥处理下稻田系统氮素流失特征.试验结果表明,施肥后各个处理的稻田坑面水中NH+4-N浓度逐日递减,无机肥处理,混施肥处理和有机肥处理的NH+4-N浓度在施肥第2天分别降低35.17%、24.78%、14.12%;施用有机肥能有效降低氮素在稻田土层中的淋溶速率,低于无机肥处理和混施肥处理,施...     

网络嵌入、知识惯性与双元创新能力 ——基于动态视角的评述

[目的/意义]网络嵌入和知识惯性对提升企业创新能力具有重要影响。[方法/过程]通过文献分析,针对网络嵌入及其演化特征对知识惯性的影响、知识惯性对双元创新能力的影响以及网络嵌入对双元创新能力的影响进行了系统梳理和评述。[结果/结论]总结提炼了3点结论,并在此基础上就如何充分利用网络嵌入的演化特征来调节知识惯性与双元创新能力间的关系,从动态视角提出了整合性理论框架以及进一步的研究思路与展望,不仅对深化该领域的研究具有理论与方法启示,同时对我国企业在动态网络下有效整合网络嵌入和知识惯性、提升双元创新能力具有重要现实指导意义。     

日本企业竞争情报系统的发展及对中国的启示——以三井物产为例

本文从三井物产管理中竞争情报系统入手,介绍了其发展概况,探究其发展特点并做出相应评价,对我国企业竞争情报系统的建立提出一些有益的启示。     

中国式管理在家族企业治理中的运用

家族企业治理是管理理论实践研究中不可缺失的重要内容,但是针对中国家族企业治理中如何体现中国式管理的研究很少。中国式管理在家族企业治理中确实有所应用,但尚未形成较为系统的研究成果。通过文献分析总结学者们对中国式管理相关研究的成果及家族企业治理中的相关问题;运用定性分析法对典型的家族企业——李锦记集团进行剖析,创新性地得出家族企业治理中体现的中国式管理思想集中反映在家文化、价值观、人际关系和安人策略上,同时指出中国式管理思想必须独到性地运用于家族企业治理以更好地指导管理实践。     

高校思想政治教育的价值旨趣与目标界定

当代高校的思想政治教育必须是以马克思主义的理论情怀为价值旨趣的,而总体看来,马克思主义的理论情怀体现在实践性、人本性和历史性上。这样的价值旨趣也为高校的思想政治教育提出了目标要求,那就是从社会现实需求出发,培养全面发展的人才,并将自身的目标置于整个国家发展的目标体系中。     

中国电力资源结构及空间布局优化研究

电力资源是我国的重要能源,对于维持经济快速发展和改善人民生活水平具有重要的保障作用。从世界其它国家发展看,发电用能源占一次能源比重呈不断上升趋势,在新世纪,我国发电用能源占一次能源比重也将不断上升。我国电力生产始终保持了较高的增长速度,并形成了以火电为主的发电结构,电网互联初规模。但是,与发电资源禀赋结构特点相比,我国电力资源在结构和空间布局上面临一系列问题：如电源结构不合理、水电发展滞后、水能资源空间分布和开发力度不匹配以及电网互连进展缓慢等,特别是水电资源丰富的优势还没有充分发挥出来,电力资源结构和空间布局亟待调整优化。针对上述问题,该文提出了电力资源结构和空间布局调整优化对策：优化电源结构,加大对西南地区水电资源开发力度、积极拓宽水电建设融资渠道和促进电网互联,这对于促进我国电力资源优化配置和生态环境改善都具有十分重要的意义。     

公众参与技术评价的意义和政治影响分析

技术评价起源于从社会的角度上关注技术发展,通过向决策者提供技术未来可能影响的信息。随着人们对科学技术新发展抱有越来越多的批评和质疑,公众参与技术评价方法被认为是针对现代社会中不确定、不平等问题的一种新的互动式解决途径。本文对这种评价范式的意义和影响进行了分析。     

中国风险投资制度演进过程与发展水平评价

1998年以来,在国家宏观政策的引导下,中国风险投资业进入了快速发展的时期,本文通过对33个国家的数据分析,构建了风险投资发展指数,并测度了中国风险投资业的发展水平。但在宏观数据背后,中国风险投资业还面临很大问题,对此通过个全国22个主要省市数据的回归分析,认为政府的过多介入是主要问题之一。     

Ecological principle meets cancer treatment: treating children with acute myeloid leukemia with low-dose chemotherapy

Standard chemotherapy regimens for remission induction of pediatric acute myeloid leukemia (AML) are associated with significant morbidity and mortality. We performed a cohort study to determine the impact of reducing the intensity of remission induction chemotherapy on the outcomes of selected children with AML treated with a low-dose induction regimen plus granulocyte colony stimulating factor (G-CSF) (low-dose chemotherapy (LDC)/G-CSF). Complete response (CR) after two induction courses was attained in 87.0% (40/46) of patients receiving LDC/G-CSF. Post-remission therapy was offered to all patients, and included standard consolidation and/or stem cell transplantation. During the study period, an additional 94 consecutive children with AML treated with standard chemotherapy (SDC) for induction (80/94 (85.1%) of the patients attained CR after induction II, P = 0.953) and post-remission. In this non-randomized study, there were no significant differences in 4-year event-free (67.4 vs. 70.7%; P = 0.99) and overall (70.3 vs. 74.6%, P = 0.69) survival in the LDC/G-CSF and SDC cohorts, respectively. After the first course of induction, recovery of white blood cell (WBC) and platelet counts were significantly faster in patients receiving LDC/G-CSF than in those receiving SDC (11.5 vs. 18.5 d for WBCs (P < 0.001); 15.5 vs. 22.0 d for platelets (P < 0.001)). To examine the quality of molecular response, targeted deep sequencing was performed. Of 137 mutations detected at diagnosis in 20 children who attained hematological CR after two courses of LDC/G-CSF (n = 9) or SDC (n = 11), all of the mutations were below the reference value (variant allelic frequency <2.5%) after two courses, irrespective of the treatment group. In conclusion, children with AML receiving LDC/G-CSF appear to have similar outcomes and mutation clearance levels, but significantly lower toxicity than those receiving SDC. Thus, LDC/G-CSF should be further evaluated as an effective alternative to remission induction in pediatric AML.