“移动互联网+”农技推广模式研究文献综述

农业技术的有效推广是提高农业生产率的关键所在,随着"互联网+"时代的到来,信息技术与农业技术推广的结合成为了新的趋势。采用文献计量分析法,对我国"互联网+"农业技术推广研究现状进行了分析。从关于"互联网+"农业技术推广必要性的探索、关于"互联网+"农业技术推广意义和作用的探索、在技术层面对"移动互联网+"农业技术推广的探索和实践以及对"移动互联网+"农业技术推广的成效评价四个方面回顾分析了国内有关"互联网+"农业技术推广的研究和进展情况。结果表明:我国对此方面的研究还不够,文献资料存量偏少,已有研究对基本情况的掌握不充分,研究力量还有待加强,应增加对于成效的定量分析。     

Human neuroblasts migrate to the olfactory bulb via a lateral ventricular extension

The rostral migratory stream (RMS) is the main pathway by which newly born subventricular zone cells reach the olfactory bulb (OB) in rodents. However, the RMS in the adult human brain has been elusive. We demonstrate the presence of a human RMS, which is unexpectedly organized around a lateral ventricular extension reaching the OB, and illustrate the neuroblasts in it. The RMS ensheathing the lateral olfactory ventricular extension, as seen by magnetic resonance imaging, cell-specific markers, and electron microscopy, contains progenitor cells with migratory characteristics and cells that incorporate 5-bromo-2'-deoxyuridine and become mature neurons in the OB.     

高校要当好新时代农业科技推广体系中的"特种兵"

中国特色社会主义进入新时代以来,农业科技创新和应用推广愈发重要,农业科技推广体系中高校的作用日益凸显.文章阐述了我国农业科技推广体系的构成及特点,并分析了高校在该体系中的地位和作用,剖析了高校技术供给的局限性及主要原因,从加强学科建设、将自主创新与产学研相结合、探索和实践高校农技推广模式等方面提出了高校当好农业科技推广体系中的"特种兵"的对策建议.     

Clusters of coupled neuroblasts in embryonic neocortex.

The neocortex of the brain develops from a simple germinal layer into a complex multilayer structure. To investigate cellular interactions during early neocortical development, whole-cell patch clamp recordings were made from neuroblasts in the ventricular zone of fetal rats. During early corticogenesis, neuroblasts are physiologically coupled by gap junctions into clusters of 15 to 90 cells. The coupled cells form columns within the ventricular zone and, by virtue of their membership in clusters, have low apparent membrane resistances and generate large responses to the inhibitory neurotransmitter gamma-aminobutyric acid. As neuronal migration out of the ventricular zone progresses, the number of cells within the clusters decreases. These clusters allow direct cell to cell interaction at the earliest stages of corticogenesis.     

“城市意象”的概念逻辑关系

本文深入解析了"城市意象"中四组概念的逻辑关系,管窥蠡测的探视了该书的基本概念的内涵与外延,探讨了城市元素或系统本身和相互之间的矛盾和消融的关系。     

Comment on "The human K-complex represents an isolated cortical down-state"

Cash et al. (Reports, 22 May 2009, p. 1084) argue that the human K-complex, a defining characteristic of slow-wave sleep, is a unipolar electroencephalogram (EEG) wave reflecting a simple neuronal hyperpolarizing event. We disagree with this conclusion and point to several confounding aspects of the study.     

“互联网+大学农技推广”服务体系新途径探索——以华南农业大学为例

文章概述了国内外农业院校农技推广典型模式,分析了我国农业高校农技推广模式存在的问题,并以华南农业大学为例,对其农技推广服务体系与服务平台进行概述,从解决生态问题、提供农业产后技术服务、提高农产品质量安全水平、建立农业综合服务App等方面探索了"互联网+大学农技推广"服务新途径,以期为其他农业院校开展农技推广工作提供借鉴。     

Comment on "HST2 mediates SIR2-independent life-span extension by calorie restriction"

Calorie restriction (CR) increases life span in yeast independently of Sir2. Lamming et al. (Reports, 16 September 2005, p. 1861) recently proposed that Sir2-independent life-span extension by CR is mediated by the Sir2 paralogs Hst1 and Hst2. Contradictory to this, we find that CR greatly increases life span in cells lacking Sir2, Hst1, and Hst2, which suggests that CR is not mediated by Sir2, Hst2, or Hst1.     

关于农技推广中应用"互联网+"的作用分析及发展前景探讨

“互联网+”作为新一轮的科技革命和产业变革正在孕育兴起,在社会各行各业都已取得了 不错的应用成效,也为这些行业的工作提升创造了便利条件。农业是我国经济的重要组成部分,而农 技推广对促进农业科学生产和提升农业生产水平具有重要的战略意义,所以更应重视“互联网+”、大 数据、人工智能、区块链等在农技推广中的应用,期望借此契机实现先进农业技术的快速普及和有效 转化,进而引导我国的农业生产向着更加科学和规范的方向发展。     

Proteoglycan-specific molecular switch for RPTPσ clustering and neuronal extension

Heparan and chondroitin sulfate proteoglycans (HSPGs and CSPGs, respectively) regulate numerous cell surface signaling events, with typically opposite effects on cell function. CSPGs inhibit nerve regeneration through receptor protein tyrosine phosphatase sigma (RPTPσ). Here we report that RPTPσ acts bimodally in sensory neuron extension, mediating CSPG inhibition and HSPG growth promotion. Crystallographic analyses of a shared HSPG-CSPG binding site reveal a conformational plasticity that can accommodate diverse glycosaminoglycans with comparable affinities. Heparan sulfate and analogs induced RPTPσ ectodomain oligomerization in solution, which was inhibited by chondroitin sulfate. RPTPσ and HSPGs colocalize in puncta on sensory neurons in culture, whereas CSPGs occupy the extracellular matrix. These results lead to a model where proteoglycans can exert opposing effects on neuronal extension by competing to control the oligomerization of a common receptor.     

烤烟“井窖式”移栽技术推广总结

"井窖式"移栽技术在地膜覆盖或露地栽培的基础上,融合了小苗移栽技术、深栽技术,能较好地营造适宜烟苗生长的微环境,实现了减工降本、提质增效。综述了该移栽技术的主要优势及推广过程中出现的问题,并提出了相关对策。     

“近自然林”──一种有发展前景的“人工天然林”

本文简要的论述了“近自然林”的由来、内涵以及在中欧国家的实施情况。认为发展“近自然林”是21世纪我国林业特续发展的重要途径之一，并针对我国的具体情况，提出了相应的对策和建议。     

The neuronal growth-associated protein GAP-43 induces filopodia in non-neuronal cells

The neuron-specific protein GAP-43 is associated with the membrane of the nerve growth cone and thus may be important to the activity of this distinctive neuronal structure. Transient transfection of COS and NIH 3T3 cells with appropriate vectors resulted in expression of GAP-43 in these non-neuronal cells; as in neurons, transfected GAP-43 associated with the membrane. In addition, many long fine filopodial processes extended from the periphery of such transfected cells. Stable CHO cell lines expressing GAP-43 also exhibited processes that were more numerous, far longer, and more complex than those of CHO cell lines not transfected or transfected with control plasmids. Thus GAP-43 may directly contribute to growth cone activity by regulating cell membrane structure and enhancing extension of filopodial processes.     

Comment on "Brain IRS2 signaling coordinates life span and nutrient homeostasis"

Taguchi et al. (Reports, 20 July 2007, p. 369) reported that mice heterozygous for a null mutation in insulin receptor substrate-2 (Irs2) display a 17% increase in median life span. However, using the same mouse model, we find no evidence for life-span extension and suggest that the findings of Taguchi et al. were due to atypical life-span profiles in their study animals.     

襄阳市油菜生产“五化”研究初探

为了应对油菜(Brassica campestris L.)生产形势的严峻挑战,提高油菜产业的国际竞争力以及与国内同季作物的竞争力,国家油菜产业技术体系提出了油菜产业发展"机械化、轻简化、集成化、规模化、标准化"(简称"五化")的新举措。总结了湖北省襄阳市开展油菜产业"五化"研究及示范推广的进展情况,并探讨了存在的问题及今后的发展方向。     

阅读新形式——浅谈“文惠讲坛”的创新与发展

阐述了在拓展延伸服务新领域中,柳州市图书馆开展阅读新形式——文化讲座。为读者提供丰富多彩的阅读平台,充分发挥其社会教育职能作用。介绍了"文惠讲坛"内容、形式和宣传组织途径的实践经验和创新,对今后的发展方向进行分析探索。     

甘薯新品种“福宁薯12号”种植表现及高产栽培技术

总结甘薯新品种“福宁薯12号”3年来在连城县试种、示范、推广种植的产量表现,品种特征特性及其高产栽培技术.     

早晚兼用型高大韧稻品种八红优256生产示范与推广小结

八红优256是2004年审定通过的第一代高大韧水稻品种。为了充分发挥该品种的优良种性,于2012年对该品种进行了大面积的栽培技术示范,重点开展该品种在桂中地区的辐射推广工作。在桂中和桂南地区,各设立两个品种栽培技术示范点,早晚稻各示范面积23.33 km2。在桂中的9个县区强化开展新品种的辐射推广工作。比较和分析八红优256桂中和桂南在早稻和晚稻的示范与推广中稻谷产量的差异。试验结果揭示,八红优256在桂中南地区一般产量7800—8400kg/hm2,作早稻和作晚稻栽培产量差异不显著,在桂中和在桂南地区栽培产量差异也不显著。说明八红优256是桂中和桂南地区典型的早晚兼用型品种,具有较广环境适应性,采取科学的栽培技术方法可以获得高产或超高产。研究结果重新验证了八红优是广适性、早晚稻兼用型、易栽培的高产优质高大韧稻品种。     

“桂淮5号”淮山机沟栽培技术试验初报

为改变贵港市淮山品种单一的局面,探索提高旱地资源利用效率的途径,首次引进淮山桂淮5号机沟栽培技术,进行熟地、荒地的桂淮5号机沟栽培及机沟与人工对比试验。结果表明,桂淮5号适宜在贵港市旱地推广种植,667m2产可达3 174 kg;桂淮5号如配合机沟栽培技术,取得节省人工增产增收的显著效果。     

Comment on "A persistent oxygen anomaly reveals the fate of spilled methane in the deep Gulf of Mexico"

Kessler et al. (Reports, 21 January 2011, p. 312) reported that methane released from the 2010 Deepwater Horizon blowout, approximately 40% of the total hydrocarbon discharge, was consumed quantitatively by methanotrophic bacteria in Gulf of Mexico deep waters over a 4-month period. We find the evidence explicitly linking observed oxygen anomalies to methane consumption ambiguous and extension of these observations to hydrate-derived methane climate forcing premature.