检索结果-南通市图书馆

Rapid Propagation of Rhynchostylis retusa in Vitro

Phyton-International Journal of Experimental Botany 2021年第3期90卷 987-1001页

作者： Yinkai Xi biao zeng Hengyu Huang Yunnan Breeding and Cultivation Research and Development Center of Endangered and Daodi Chinese Medicinal Materials Yunnan University of Chinese MedicineKunming650000China Chemistry Department Guizhou University of Traditional Chinese MedicineGuiyang550000China Yunnan Academy of Agricultural Science Kunming650000China Qiucheng Breeding Company Ltd. Lijiang674100China

An efficient regeneration system of Rhynchostylis retusa was established to provide technical reference for the application of tissue culture tube seedlings in *** mixtures of callus and protocorm from aseptic germination were used as *** optimal media of each stage was selected for callus proliferation,protocorm occurrence and growth,rejuvenation and rooting via a single,complete combination and orthogonal *** results showed that the optimal medium for callus proliferation,protocorms occurrence and growth was 1/2 Murashige and Skoog(MS)medium adding 50 g·L^(−1) banana puree,0.1 mg·L^(−1)α-naphthaleneacetic acid(NAA),1.5 mg·L^(−1)6-benzylaminopurine(6-BA)and 1.0 mg·L^(−1) kinetin(KT)with 17.33 proliferation coefficient of callus and 19.63 occurrence coefficient of buds after 90 *** the buds occurred from protocorm were cultured on 1/2 MS medium including 100 g·L^(−1) banana puree,1.0 mg·L^(−1) NAA,2.0 mg·L^(−1)6-BA and 0.05 mg·L^(−1) KT,in which the proliferation coefficient of callus was 10.32 and occurrence coefficient of buds reached *** the further subculture,the same medium was simultaneously used for callus proliferation,protocorm occurrence and bud *** plantlets developed roots in 1/2 MS medium containing 70 mL·L^(−1) coconut water and 1.5 mg·L^(−1) NAA with 100%rooting rates after 90 *** survival rate was more than 90%after domestication and *** regeneration protocol will provide technique foundation for protecting wild resource and developing artificial cultivation.

关键词： Rhynchostylis retusa callus protocorm proliferation coefficient rapid propagation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genome-wide Transcription Factor Gene Prediction and their Expressional Tissue-Specificities in Maize

引用

Journal of Integrative Plant Biology 2012年第9期54卷 616-630页

作者： Yi Jiang biao zeng Hainan Zhao Mei Zhang Shaojun Xie Jinsheng Lai State Key Laboratory of Agrobiotechnology and National Maize Improvement Center Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China

Transcription factors （TFs） are important regulators of gene expression. To better understand TFencoding genes in maize （Zea mays L.）, a genome-wide TF prediction was performed using the updated B73 reference genome. A total of 2 298 TF genes were identified, which can be classified into 56 families. The largest family, known as the MYB superfamily, comprises 322 MYB and MYB-related TF genes. The expression patterns of 2014 （87.64%） TF genes were examined using RNA-seq data, which resulted in the identification of a subset of TFs that are specifically expressed in particular tissues （including root, shoot, leaf, ear, tassel and kernel）. Similarly, 98 kernel-specific TF genes were further analyzed, and it was observed that 29 of the kernel-specific genes were preferentially expressed in the early kernel developmental stage, while 69 of the genes were expressed in the late kernel developmental stage. Identification of these TFs, particularly the tissue-specific ones, provides important information for the understanding of development and transcriptional regulation of maize.

关键词： Genome-wide maize tissue-specific transcription factor.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Facile synthesis of zinc-based organic framework for aqueous Hg (Ⅱ) removal: Adsorption performance and mechanism

引用

Nano Materials Science 2021年第4期3卷 429-439页

作者： biao zeng Wei Wang Sijin He Guo Lin Wenjia Du Jun Chang Zhao Ding The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081PR China Key Laboratory for Ferrous Mtallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081PR China China E-port Data Center Division of Chengdu Chengdu610041PR China Electrochemical Innovation Lab Department of Chemical EngineeringUniversity College London(UCL)LondonWC1E 68TUK College of Material and Chemical Engineering Tongren University Tongren554300GuizhouPR China Department of Mechanical Materials and Aerospace Engineering Illinois Institute of TechnologyChicagoIL60616 USA

Mercury(Hg)ions can lead to a serious impact on the environment;therefore,it was necessary to find an effective method for absorbing these toxic Hg ***,the adsorbent(Zn-AHMT)was synthesized from zinc nitrate and 4-amino 3-hydrazine-5 mercapto-1,2,4-triazole(AHMT)by one-step method and,characterized the microstruc-ture and absorption performance by fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD),Brunauer-Emmett Teller(BET),Thermal Gravimetric Analyzer(TGA)and X-ray photoelectron spectroscopy(XPS).Through a plethora of measurements,we found that the maximum adsorption capacity was 802.8 mg/g when the optimal pH of Zn-AHMT was *** isothermal and kinetic experiments confirm that the reaction process of Zn-AHMT was chemisorption,while the adsorption process conforms to the Hill model and pseudo second order kinetic *** experiments showed that the adsorption process was spontaneous and *** experiments were performed in the simulated wastewater containing Mn,Mg,Cr,Al,Co,Ni,Hg *** results showed that the Zn-AHMT has a stronger affinity for Hg *** removal rate of Zn-AHMT remained above 98%,indicating that the Zn-AHMT had a good stability validated by three adsorption-desorption repeatable *** to the XPS results,the adsorption reaction of Zn-AHMT was mainly attributed to the chelation and ion *** was further explained by both density functional theory(DFT)calculation and frontier molecular orbital *** therefore propose the adsorption mechanism of *** adsorption reaction facilitates via the synergistic action of S and N ***,the bonding between the adsorbent and the N atom has been proved to be more *** study demonstrated that Zn-AHMT had a promising application prospect in mercury removal.

关键词： Metal-organic frameworks(MOFs) Hg(Ⅱ) Selectivity Adsorption mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Vegetation Cover Variation in the Qilian Mountains and its Response to Climate Change in 2000-2011

引用

Journal of Mountain Science 2013年第6期10卷 1050-1062页

作者： DENG Shao-fu YANG Tai-bao zeng biao ZHU Xi-fen XU Hao-jie Key Laboratory of Western China’s Environmental System (Ministry of Education) Research School of Arid Environment & Climate Change Lanzhou University Institute of Glaciology and Ecogeography College of Earth and Environmental Sciences Lanzhou University Geological Team No. 135 Sichuan Bureau of Coal Geology

An understanding 0f variati0ns in vegetati0n c0ver in resp0nse t0 climate change is critical f0r predicting and managing future terrestrial ec0system dynamics. Because scientists anticipate that m0untain ec0systems will be m0re sensitive t0 future climate change c0mpared t0 0thers, 0ur 0bjectives were t0 investigate the impacts 0f climate change 0n variati0n in vegetati0n c0ver in the Qilian M0untains （QLM）, China, between 2000 and 2011. T0 acc0mplish this, we used linear regressi0n techniques 0n 250-m MODIS N0rmalized Difference Vegetati0n Index （NDVI） datasets and mete0r0l0gical rec0rds t0 determine spati0temp0ral variability in vegetati0n c0ver and climatic fact0rs （i.e. temperature and precipitati0n）. Our results sh0wed that temperatures and precipitati0n have increased in this regi0n during 0ur study peri0d. In additi0n, we f0und that gr0wing seas0n mean NDVI was mainly distributed in the vertical z0ne fr0m 2,700 m t0 3,600 m in elevati0n. In the study regi0n, we 0bserved significant p0sitive and negative trends in vegetati0n c0ver in 26.71% and 2.27% 0f the vegetated areas. C0rrelati0n analyses indicated that rising precipitati0n fr0m May t0 August was resp0nsible f0r increased vegetati0n c0ver in areas with p0sitive trends in gr0wing seas0n mean NDVI. H0wever, there was n0 similar significant c0rrelati0n between gr0wing seas0n mean NDVI and precipitati0n in regi0ns where vegetati0n c0ver declined thr0ugh0ut 0ur study peri0d. Using spatial statistics, we f0und that veeetati0n c0ver freauentlvdeclined in areas within the 2,500-3,100 m vertical z0ne, where it has steep sl0pe, and is 0n the sunny side 0f m0untains. Here, the p0sitive influences 0f increasing precipitati0n c0uld n0t 0ffset the drier c0nditi0ns that 0ccurred thr0ugh warming trends. In c0ntrast, in higher elevati0n z0nes （3,900-4,500 m） 0n the shaded side 0f the m0untains, rising temperatures and increasing precipitati0n impr0ved c0nditi0ns f0r vegetati0n gr0wth. Increased precipitati0n als0 faci

关键词： NDVI Temperature Precipitation Topography

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spectral Characterization of the Edge-Deleted Subgraphs of Complete Graph

引用

Journal of Mathematical Research and Exposition 2010年第5期30卷 833-840页

作者： Ting zeng WU Sheng biao HU Department of Mathematics Qinghai Nationalities University Qinghai 810007 P. R. China

In this paper, we show that some edges-deleted subgraphs of complete graph are determined by their spectrum with respect to the adjacency matrix as well as the Laplacian matrix.

关键词： cospectral graphs spectra of graph eigenvalues.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Note on the Nullity of Unicyclic Graphs

引用

Journal of Mathematical Research and Exposition 2010年第5期30卷 817-824页

作者： Wei ZHU Ting zeng WU Sheng biao HU Department of Mathematics Qinghai Nationalities University Qinghai 810007 P. R. China

The number of zero eigenvalues in the spectrum of the graph G is called its nullity and is denoted by η（G）. In this paper, we determine the all extremal unicyclic graphs achieving the fifth upper bound n - 6 and th... 详细信息

关键词： eigenvalues nullity unicyclic graphs.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Triple plasmon-induced transparency and outstanding slow-light in quasi-continuous monolayer graphene structure

引用

Science China(Physics,Mechanics & Astronomy) 2021年第2期64卷 61-71页

作者： CuiXiu Xiong Hui Xu MingZhuo Zhao BaiHui Zhang Chao Liu biao zeng Kuan Wu BanXian Ruan Min Li HongJian Li School of Physics and Electronics Central South UniversityChangsha410083China All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province College of Information and Electronic EngineeringHunan City UniversityYiyang413000China School of Mathematics and Statistics Hunan University of Technology and BusinessChangsha410205China

We propose a simple quasi-continuous monolayer graphene structure and achieve a dynamically tunable triple plasmon-induced transparency(PIT)effect in the proposed *** analyses indicate that the proposed structure contains a selfconstructed bright-dark-dark mode system.A uniform theoretical model is introduced to investigate the spectral response characteristics and slow light-effects in the proposed system,and the theoretical and the simulated results exhibit high *** addition,the influences of the Fermi level and the carrier mobility of graphene on transmission spectra are *** is found that each PIT window exhibits an independent dynamical adjustability owing to the quasi-continuity of the proposed ***,the slow-light effects are investigated based on the calculation of the group refractive index and phase *** is found that the structure displays excellent slow-light effects near the PIT windows with high-group indices,and the maximum group index of each PIT window exceeds 1000 when the carrier mobility of graphene increases to 3.5 m^2 V^-1s^-*** proposed structure has potential to be used in multichannel filters,optical switches,modulators,and slow-light ***,the established theoretical model lays a theoretical basis for research on multimode coupling effects.

关键词： monolayer graphene structure plasmon-induced transparency slow light

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Luminescence chronology and age model application for the upper part of the Chumbur-Kosa loess sequence in the Sea of Azov, Russia

引用

Journal of Mountain Science 2018年第3期15卷 504-518页

作者： CHEN Jie YANG Tai-bao G.G.MATISHOV A.A.VELICHKO zeng biao HE Yi SHI Pei-hong Institute of Glaciology and Ecogeography College of Earth and Environmental Sciences Lanzhou University Lanzhou 730000 China Southern Scientific Center Russian Academy of Sciences Chekhov Av. 41 344006 Rostov-on-Don Russia Institute of C-eography Russian Academy of Sciences Staromonetny 29 Moscow 109027 Russia Faculty of Geomatics Lanzhou Jiaotong University Lanzhou 730000 China College of Tourism and Environment Shananxi Normal University Xi'an 710119 China

A reliable chronology is essentially critical for correlating loess records with other paleoenvironmental time series, as well as for continuing improvements in the reconstruction of paleoenvironment and paleoclimate changes. It is exactly that the scarcity of chronologies across the Sea of Azov has limited the interpretation of climatic and environmental information in the East European Plain. In view of this, this paper conducted an exploratory study to investigate whether the optically stimulated luminescence(OSL) dating of medium-grained quartz could be used to obtain a set of chronologies and the age models could be used to establish an independent time scale since the Late Pleistocene for the Sea of Azov loess. The results showed that an internally consistent set of optical ages for the Azov loess deposited up to ~76 ka. In addition, the ages developed based on magnetic susceptibility and grain size ages models showed good comparability with independent OSL ages at an acceptable range, suggesting that it might be practicable to establish an independent time scale using age models at the Sea of Azov loess, at least for the uppermost part of the Chumbur-Kosa section. Comparison with the ages based on two age models,the grain size ages using fine-grain fractions may provide a more reliable chronological sequence at the Azov loess since the Late Pleistocene. With the help of absolute ages and climate proxies(magnetic susceptibility and grain size), paleoclimatic change in the Sea of Azov have been traced for the Late Pleistocene.

关键词： Optical dating Age models Loess Late Pleistocene Sea of Azov

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Paleoclimatic record from Chumbur-Kosa section in Sea of Azov region since Marine Isotope Stage 11

引用

Journal of Mountain Science 2016年第6期13卷 985-999页

作者： LIANG Ye YANG Tai-bao Andrey Aleksevitch VELICHKO zeng biao SHI Pei-hong WANG Lin-dong HE Yi CHEN Jie CHEN Yu Institute of Glaciology and Ecogeography College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Geography Russian Academy of SciencesMoscow 109027Russia

Abstract： Loess-paleosol sequences preserve records of climatic change during the Quaternary, which is important for paleoclimate study. In this study, a loess-palaeosol sequence from the Chumbur- Kosa （CK） site in the Sea of Azov region was investigated to reconstruct climatic variability during the Marine Isotope Stage （MIS）11- MIS 1, using proxies of grain size （GS）, magnetic susceptibility （xlf and Xfd（%））, carbonate content （CaCO3%） and soil color The results enabled formulation of a detailed description of the climatic characteristics related to each individual layer. The sequence indicates that the paleoclimate shifted progressively towards increasingly cooler, somewhat drier conditions. The CK section may thus be ideal for reconstructing climatie eondifions during the Middle and Late Pleistocene in the Sea of Azov region. However, the ）Of value of paleosol $2 in the CK profile indicates different characteristics from the other paleosol layers, dilution of carbonate resulting from carbonate leaching in L2 may be the main reason for the decrease in magnetic susceptibility. Furthermore, through simple analysis part of the environmental evolution process in the Sea of Azov region and Serbia during Middle and Late Pleistocene cycles. The climate cycle expressed by Xfd（%） and Xlf variations show similar patterns, with rapidly alternating cold and warm intervals. Nevertheless, although the two areas had different climatic regimes, geographical settings, and loess source areas, both exhibited similar climate change trends since the MIS 11.

关键词： Loess Paleosol Magnetic susceptibility Paleoclimate Sea of Azov

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

甲基转移酶抑制剂5-Aza-dC对FANCF基因表达的调控在卵巢癌治疗中的作用

引用

肿瘤 2012年第6期32卷 413-419页

作者：李敏曾飚重庆医科大学附属第二医院妇产科重庆400010

目的:探讨甲基转移酶抑制剂5-氮杂-2'-脱氧胞苷(5-aza-2'-deoxycytidine,5-Aza-dC)对卵巢癌细胞系OVCAR3中FANCF(Fanconi anemia complementation group F)基因表达的影响,及其对化疗药物紫杉醇敏感性的影响,以了解5-Aza-dC的抗肿瘤效应,寻找卵巢癌治疗的新靶点。方法:采用5-Aza-dC处理FANCF基因甲基化的卵巢癌细胞OVCAR3和FANCF基因非甲基化的卵巢癌细胞A2780。应用甲基化特异性PCR(methylation speci-c-PCR,MSP)、RT-PCR和蛋白质印迹法分析这2种细胞经5-Aza-dC处理前后FANCF基因的甲基化状态以及FANCF mRNA和蛋白的表达情况。MTT法检测卵巢癌细胞的增殖情况。FCM检测紫杉醇对卵巢癌细胞凋亡的影响。建立OVCAR3和A2780细胞裸鼠移植瘤模型,观察5-Aza-dC对裸鼠移植瘤生长的影响,并采用免疫组织化学法检测移植瘤中FANCF蛋白的表达情况。结果:体外实验显示,5-Aza-dC处理后,OVCAR3细胞中FANCF基因发生去甲基化,FANCF mRNA和蛋白的表达水平增加,细胞生长缓慢。5-Aza-dC处理组OVCAR3细胞裸鼠移植瘤体积较未处理组明显缩小,质量也明显降低,FANCF蛋白表达增加;而A2780细胞裸鼠移植瘤组中未观察到上述变化。结论:甲基转移酶抑制剂5-Aza-dC可能通过抑制卵巢癌细胞增殖而成为潜在的卵巢癌治疗药物,但同时也会增加紫杉醇的耐药风险。

关键词：卵巢肿瘤 DNA甲基化 FANCF基因 5-氮杂-2’-脱氧胞苷

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：