检索结果-南通市图书馆

Transcription factor GLK1 promotes anthocyanin biosynthesis via an MBW complex-dependent pathway in Arabidopsis thaliana

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2023年第6期65卷 1521-1535页

作者： yan li Wei Lei Zuxu Zhou yanlin li Dawei Zhang Honghui lin Ministry of Education Key Laboratory for Bio-Resource and Eco-Environment State Key Laboratory of Hydraulics and Mountain River EngineeringCollege of Life ScienceSichuan UniversityChengdu 610064China Chongqing Key Laboratory of Plant Resource Conservation and Germplasm Innovation SWU-TAAHC Medicinal Plant Joint R&D CentreSchool of Life SciencesSouthwest UniversityChongqing 400715China

Anthocyanins are important natural plant pigments and play diverse roles in plant growth and *** function as screens to protect photosynthetic tissues from ***,the regulatory mechanisms underlying the biosynthesis and spatial accumulation pattern of anthocyanins remain some unresolved ***,we demonstrate that the GARP-type transcription factor GOLDEN2-liKE 1(GLK1)functions as a positive factor in anthocyanin ***1 enhances the transcriptional activation activities of MYB75,MYB90,and MYB113 via direct proteinprotein interactions to increase the expression of anthocyanin-specific biosynthetic *** accumulate in an acropetal manner in *** also found that the expression pattern of GLK1 overall mimicked the accumulation pattern of anthocyanin from the base of the main stem to the shoot *** on these findings,we established a working model for the role of GLK1 in anthocyanin accumulation and propose that GLK1mediates the spatial distribution pattern of anthocyanins by affecting the transcriptional activation activities of MYB75,MYB90,and MYB113.

关键词： anthocyanin biosynthesis GLK1 MYB75 transcriptional activation activity

The column density structure of Orion A depicted by N-PDF

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2020年第4期20卷 139-155页

作者： Yue-hui Ma Hong-Chi Wang Chong li Ji yang purple mountain observatory and Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210033China University of chinese academy of sciences Beijing 100049China School of Astronomy and Space Science University of Science and Technology of ChinaAnhui 230026China

We have conducted a large-field simultaneous survey of 12 CO,13 CO and C18O J=1-0 emission toward the Orion A giant molecular cloud(GMC)with a sky coverage of4.4 deg2 using the purple mountain observatory(PMO)-13.7 m millimeter-wavelength *** use the probability distribution function of the column density(N-PDF)to investigate the distribution of molecular hydrogen in the Orion A *** H2 column density,derived from the 13CO emission,of the GMC is dominated by a log-normal distribution in the range from4×1021 to1.5×1023 cm-2 with excesses both at the low-density and high-density *** excess of the low-density end is possibly caused by an extended and low-temperature(10 K)component with velocities in the range of 5-8 km *** with the northern sub-regions,the southern sub-regions of the Orion A GMC contain less gas with column density in NH2>1.25×1022 *** dispersions of the N-PDFs of the sub-regions are found to correlate with the evolutionary stages of the clouds across the Orion A *** structure hierarchy of Orion A GMC is explored with the DENDROGRAM algorithm,and it is found that the GMC is composed of two *** structures except one in the tree have virial parameters less than 2,indicating self-gravity is important on the spatial scales from0.3 to4 *** power-laws and departures from lognormal distributions are found at the high-density end of N-PDFs for active star-forming regions,the N-PDFs of structures in the Orion A GMC are predominantly lognormal on scales from R0.4 to 4 pc.

关键词： ISM:clouds ISM:individual objects(Orion A) ISM:structure stars:formation surveys turbulence

植被景观斑块周长与面积比值分布的核密度研究

在线全文

学校读者我要写书评

暂无评论

西北林学院学报 2018年第2期33卷 224-230页

作者：张春英蒋丽明李新燕陈辞洪伟兰思仁福建工程学院建筑与城乡规划学院福建福州350118 建农林大学艺术园林学院福建福州350002 福建农林大学森林生态研究所福建福州350002

利用非参数核密度估计方法对武夷山世界自然遗产地植被景观斑块周长与面积比值分布拟合进行研究。结果表明,非参数核密度估计是模拟植被斑块周长与面积比值分布一种有效的方法;马尾松林景观、杉木林景观、硬阔叶林景观、软阔叶林景观和... 详细信息

利用非参数核密度估计方法对武夷山世界自然遗产地植被景观斑块周长与面积比值分布拟合进行研究。结果表明,非参数核密度估计是模拟植被斑块周长与面积比值分布一种有效的方法;马尾松林景观、杉木林景观、硬阔叶林景观、软阔叶林景观和灌木景观的斑块周长与面积比值分布拟合效果均在组间距为0.005时最佳;毛竹林景观和茶园景观斑块周长与面积比值分布拟合效果在组间距为0.03时最佳;黄山松景观和草地景观斑块周长与面积比值分布在组间距为0.01时达到最好的拟合效果;经济林景观的斑块周长与面积比值分布在0.002 5时达到最优拟合效果;斑块周长与面积比值分布通过影响景观结构,对景观系统内的生态过程、生物系统、生境性质产生重要作用。

关键词：植被景观核密度估计组间距

在线全文

学校读者我要写书评

暂无评论

茄子新品种“驻茄14号”的选育

北方园艺 2024年第14期 157-160,F0002页

作者：王勇姜俊赵红星翟新然李艳赵鑫驻马店市农业科学院河南省茄科蔬菜作物新种质创制与利用工程技术研究中心河南驻马店463000 周口市川汇区蔬菜科学研究所河南周口466001

“驻茄14号”是利用自交系“驻ZQ-07-09”作母本,自交系“驻ZQ-06-16”作父本,采用优势杂交育种方法选育出杂交一代茄子新品种。其植株生长势强,坐果能力强,果实圆卵形,果皮紫色,光泽度较强,果肉颜色为绿白色,口感绵软细腻,茄汁浓郁,爽... 详细信息

“驻茄14号”是利用自交系“驻ZQ-07-09”作母本,自交系“驻ZQ-06-16”作父本,采用优势杂交育种方法选育出杂交一代茄子新品种。其植株生长势强,坐果能力强,果实圆卵形,果皮紫色,光泽度较强,果肉颜色为绿白色,口感绵软细腻,茄汁浓郁,爽口润滑。果实纵径13.5 cm,横径11.5 cm,平均单果质量0.62 kg,667 m^(2)平均产量为5580.29 kg,“驻茄14号”对青枯病、黄萎病、绵疫病的抗性较强,目前已经在河南省及周边地区辐射推广种植,综合农艺性状表现良好。

关键词：茄子 “驻茄14号” 一代杂种

Current re-vegetation patterns and restoration issues in degraded geological phosphorus-rich mountain areas:A synthetic analysis of Central Yunnan, SW china

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2017年第3期39卷 140-148页

作者： Kai yan Sailesh Ranjitkar Deli Zhai Yunju li Jianchu Xu Bo li yang Lu Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences World Agroforestry Center ICRAF East and Central Asia The State Phosphorus Resource Development and Utilization Engineering Technology Research Centre Yunnan Phosphate Chemical Group Co. Ltd College of Resource and Environment Yunnan Agricultural University

china has the largest area of inland geological phosphorus-rich(GPR) mountains in the world, where vegetation restoration is key to safeguarding the environment. We reviewed the published literature and collected new data in order to analyze re-vegetation patterns and the status of plant communities in central Yunnan. The aim of our analysis was to suggest future improvements to restoration strategies in GPR mountain regions. Our results showed that spontaneous recovery was the most widespread type of restoration. N-fixing species such as Coriaria nepalensis and Alnus nepalensis play a vital role in succession. In the past, monoculture tree plantation was the primary method used in afforestation activities in central Yunnan; in recent years however, several different methods of restoration have been introduced including the use of agroforestry systems. For practical restoration, we found that spontaneous recovery was capable of delivering the best results, but that during its early stages, restoration results were affected by several factors including erosion risk, the origin of propagates and environmental variation. In contrast, methods employing human-made communities performed better in their early stages, but were constrained by higher costs and vulnerability to degradation and erosion. The use of N-fixing species such as A. nepalensis and Acacia mearnsii in plantations were unsuccessful in restoring full ecosystem functions. The success of restoration activities in GPR mountain regions could be improved through the following measures:(1) developing a better understanding of the respective advantages and disadvantages of current natural and human-engineered restoration approaches;(2) elucidating the feedback mechanism between phosphorus-rich soil and species selected for restoration, especially N-fixing species;(3) introducing market incentives aimed at encouraging specific restoration activities such as agroforestry, and improving the industry value chain.

关键词： Systematic review Dianchi Lake Fuxian Lake Natural restoration Human engineered restoration Floristic similarity

在线全文

学校读者我要写书评

暂无评论

类星体的光度演化

天文学报 1982年第3期 243-254页

作者：龚树模夏昌立中国科学院紫金山天文台

本文根据四项关于类星体标准烛光的工作,应用光度距离正确公式,求出改进的减速因子q0。从类星体新表求出统计的（z）-z关系,然后计算出类星体的绝对星等（z）和（t）以及它们的变率d（z）/dz和d（z）/dt。文中说明求q0的过程和所得结果,... 详细信息

本文根据四项关于类星体标准烛光的工作,应用光度距离正确公式,求出改进的减速因子q0。从类星体新表求出统计的（z）-z关系,然后计算出类星体的绝对星等（z）和（t）以及它们的变率d（z）/dz和d（z）/dt。文中说明求q0的过程和所得结果,q0=+2.07,并叙述了处理1500多颗类星体的方法和所得（z）的表达式。还求出（z）和它们的变率。最后对所取样品有无Malmquist效应以及q0的大小两种值,进行了讨论;也对同类工作进行了比较讨论。

关键词：类星体视星等变率子集哈勃图活动星系相对平均差标准烛光绝对星等

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

关帝山不同海拔土壤碳矿化和微生物特征

中国环境科学 2018年第5期38卷 1811-1817页

作者：李君剑杜宏宇刘菊严俊霞李洪建山西大学黄土高原研究所山西太原030006 山西省林业科学院山西太原030012

以山西省关帝山不同海拔的8个样地土壤为研究对象,分析不同海拔土壤碳氮含量、土壤碳矿化和细菌、真菌、放线菌、固氮菌、硝化细菌和反硝化细菌6类微生物量的变化.结果表明,海拔为2163m时,土壤有机碳和活性碳1(LC1)最高,分别为74.41和6.... 详细信息

以山西省关帝山不同海拔的8个样地土壤为研究对象,分析不同海拔土壤碳氮含量、土壤碳矿化和细菌、真菌、放线菌、固氮菌、硝化细菌和反硝化细菌6类微生物量的变化.结果表明,海拔为2163m时,土壤有机碳和活性碳1(LC1)最高,分别为74.41和6.72g/kg,在海拔2700m总氮含量最高为6.54g/kg.土壤碳矿化累积量和碳矿化速率因海拔的升高而显著增加(P2(LC2)之间有显著正相关.土壤细菌、放线菌和固氮菌的数量在海拔为1791m时最高,分别为3.41×10~6、1.90×10~6和1.21×10~6个/g,细菌、真菌、放线菌和固氮菌的数量随着海拔的升高而逐渐下降,与海拔之间呈显著负相关;相反,硝化细菌和反硝化细菌数量却逐渐增加,在海拔为2700m时最高,分别为1.37×10~4和6.02×10~3个/g,它们与海拔和总氮之间的关系呈显著正相关(P1).总之,土壤有机碳、总氮、碳矿化累积量、硝化细菌和反硝化细菌随海拔显著增加,而细菌、真菌、放线菌和固氮菌随海拔的变化呈相反的趋势.

关键词：海拔土壤碳矿化微生物量活性碳

A low-profile dual-broadband dual-circularly-polarized reflectarray for K-/Ka-band space applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2024年第8期25卷 1145-1161页

作者： Xuanfeng TONG Zhi Hao JIANG Yuan li Fan WU lin PENG Taiwei YUE Wei HONG State Key Laboratory of Milimeter Waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096China purple mountain Laboratories Nanjing 21lllChina State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE CorporationShenzhen 518057China Apple Inc. One Apple Park WayCupertinoCA 95014USA

A low-profile dual-broadband dual-circularly-polarized(dual-CP)reflectarray(RA)is proposed and demonstrated,supporting independent beamforming for right-/left-handed CP waves at both K-band and *** functionality is achieved by incorporating multi-layered phase shifting elements individually operating in the K-and Ka-band,which are then interleaved in a shared aperture,resulting in a cell thickness of only about *** rotating the designed K-and Ka-band elements around their own geometrical centers,the dual-CP waves in each band can be modulated *** reduce the overall profile,planar K-/Ka-band dual-CP feeds with a broad band are designed based on the magnetoelectric dipoles and multi-branch hybrid *** planar feeds achieve bandwidths of about 32%and 26%at K-and Ka-band respectively with reflection magnitudes below-13 dB,an axial ratio smaller than 2 dB,and a gain variation of less than 1 dB.A proof-of-concept dual-band dual-CP RA integrated with the planar feeds is fabricated and characterized which is capable of generating asymmetrically distributed dual-band dual-CP *** measured peak gain values of the beams are around 24.3 and 27.3 dBic,with joint gain variation1 dB and axial ratio2 dB bandwidths wider than 20.6%and 14.6%at the lower and higher bands,*** demonstrated dual-broadband dual-CP RA with four degrees of freedom of beamforming could be a promising candidate for space and satellite communications.

关键词： Broadband Dual-band Dual-circularly-polarized Reflectarray Shared-aperture

河北省太行山区‘辽宁1号’核桃叶片营养诊断技术研究

在线全文

学校读者我要写书评

暂无评论

中国农业科学 2024年第6期57卷 1153-1166页

作者：安秀红孙妍王芳冯启科王宁李津津张俊佩王红霞河北农业大学/河北省山区研究所/河北省山区农业技术创新中心/国家北方山区农业工程技术研究中心中国林业科学院林业研究所

【目的】测定河北省太行山区核桃主栽品种‘辽宁1号’叶片矿质元素并对叶片营养状况进行诊断，为‘辽宁1号’核桃科学施肥提供依据。【方法】测定‘辽宁1号’不同发育阶段叶片中矿质元素含量，以确定叶片营养诊断的采样时间；采用组分... 详细信息

【目的】测定河北省太行山区核桃主栽品种‘辽宁1号’叶片矿质元素并对叶片营养状况进行诊断，为‘辽宁1号’核桃科学施肥提供依据。【方法】测定‘辽宁1号’不同发育阶段叶片中矿质元素含量，以确定叶片营养诊断的采样时间；采用组分营养诊断法(CND)建立核桃叶片营养诊断的元素含量适宜值；运用诊断施肥综合法(L-DRIS)、CND法和适宜值偏差百分数法(DOP)对核桃低产园进行叶片营养诊断，并提供施肥建议。【结果】河北省太行山区‘辽宁1号’核桃叶片营养诊断采集最适时期为8—9月。元素相关性分析显示太行山区核桃叶片中矿质元素之间主要存在相互协同作用，K和Mg之间存在较强的拮抗作用。基于CND拐点值法将产量3.64 t·hm-2选择为划分核桃高产果园的临界值，由高产果园确定的太行山区核桃叶片矿质元素含量适宜值范围为：N(13.04—17.04)g·kg-1、P(0.67—1.23)g·kg-1、K(5.94—10.64)g·kg-1、Ca(15.64—22.16)g·kg-1、Mg(3.80—6.62)g·kg-1、Cu(5.14—8.48)mg·kg-1、Fe(437.38—794.58)mg·kg-1、Mn(126.94—172.02)mg·kg-1、Zn(14.59—34.25)mg·kg-1。用L-DRIS法、CND法以及DOP法对河北省太行山区核桃低产园进行营养诊断得到的叶片矿质元素含量丰缺状况有所差异，其中L-DRIS法与CND法诊断结果一致性更高。综合3种营养诊断方法得到河北省太行山区核桃低产园的需肥顺序为：K>P>N>Zn>Mn>Ca>Fe>Mg>Cu。【结论】河北省太行山区核桃低产园施肥时建议以K元素为主，配施N、P两种矿质元素，同时避免Mg、Cu元素过量施入。

关键词：核桃营养诊断 CND法含量适宜值