谈植物连体嫁接技术链条的拉伸

植物嫁接的目的在于增进植物的抗寒性、抗旱性、抗病虫害的能力和改良果实的品质等。植物连体嫁接技术源于植物离体嫁接技术,且随着这种嫁接技术所显现出的诸多优点,正在被广泛性的推向农业和林业生产,抢眼于技术理论层面的探索,日益拉伸着其技术链条。     

核桃高枝嫁接及栽培管理技术

嫁接技术是果树种植中常用的一种重要的技术措施,但在核桃的栽培过程中,由于核桃树体内含有单宁物质,使得核桃树嫁接的成活率不高,属于嫁接难度比较大的果树。通过核桃高枝嫁接能够有效的提高核桃的产量品质和经济效益,还能增加核桃树嫁接的成活率。做好核桃高枝嫁接和栽培技术管理,能够有效提高核桃产量,增加经济效益。     

红松嫁接技术

红松嫁接技术是通过选择优树上雌花枝条上的接穗与选择适宜的红松幼树做砧木,进行人工嫁接建立红松无性系坚果林和种子林。过去红松嫁接技术没有选择接穗和砧木的标准,嫁接方法某些环节不好掌握,出现了上部“卡脖下垂”、     

无公害嫁接甜瓜的技术

甜瓜是我国重要的农作物,不仅因为其口感香甜,还在于它为人们带来的经济效益。无公害嫁接甜瓜技术在一定程度上避免了传统种植技术的缺陷,提高了甜瓜的产量。无公害是指有毒有害物质控制在安全的范围内,无公害嫁接甜瓜既确保了甜瓜自身的营养价值,还保障了健康安全的环境品质。而且无公害甜瓜的抗旱抗寒性能在原来的基础上得到了显著的提升。本文针对无公害嫁接甜瓜技术的要点和提高无公害嫁接甜瓜技术的技巧展开相关的论述,希望可以更好地促进无公害嫁接甜瓜技术的进一步发展。     

红松嫁接技术

红松嫁接技术(专利申请号:200510085727.5)是通过选择优秀树种上雌花枝条上的接穗与选择适宜的红松幼树做砧木,进行人工嫁接建立红松无性系坚果林和种子林.过去的红松嫁接技术没有选择接穗和砧木的标准,嫁接方法的某些环节不好掌握,出现了上部"卡脖下垂",下部"愈合瘤"的现象,影响接穗正常生长,严重时会导致接穗枯萎死亡,嫁接效果不好,存在嫁接成活率低,结实期晚,产量低等问题.     

红松果林同砧与异砧嫁接容器苗的培育技术

红松(Pinus koraiensis)为东北地区珍贵的常绿大乔木,是重要的坚果树种之一。目前,主要采用嫁接苗进行红松果林的培育,我们采用髓心形成层贴接法进行红松同砧和异砧嫁接容器苗的培育技术研究,以便为生产提供可行的技术支撑。同砧和异砧嫁接苗之间,同砧嫁接成活率高于异砧嫁接,同时接穗的生长也高于异砧嫁接苗,这表明同砧嫁接的亲合力高于异砧的亲合接率,所以同砧嫁接更有利于嫁接苗的培育。     

四季山茶的芽苗砧嫁接研究

主要研究了四季山茶中杜鹃红山茶和海棠红山茶的芽苗砧嫁接技术。实验结果表明,杜鹃红山茶芽苗砧嫁接成活率为86.61%;海棠红山茶芽苗砧嫁接成活率为83.49%;较常规嫁接有较高的提高。影响四季山茶芽苗砧嫁接的因素主要有砧木的健壮程度、接穗的粗度等。     

西藏四倍体刺槐引种栽培试验初探

刺槐是蝶形花科(FABACEAE)刺槐属(RobiniaL．)落叶乔木，而四倍体刺槐是由韩国引入的新品种。通过对四倍体刺槐进行引种栽培试验，结果表明：四倍体刺槐苗在海拔3000m的高寒生态环境条件下，适应能力强，生长旺盛，枝叶繁茂，成活率高，为四倍体刺槐优质苗木的生产及利用在西藏各地区的普遍推广创出一条行之有效的途径。     

嫁接对茄子栽培及田间抗逆性影响的研究

茄子是经常出现在人们餐桌上的蔬菜之一,因此种植茄子有着很大的发展空间。在种植茄子的过程中会出现多种问题,本文从专业的角度出发,从茄子的嫁接技术的应用、嫁接对茄子的影响、以及对嫁接茄子的未来展望出发,浅谈下个人的见解,给同行以借鉴。     

“嫁接”法:加快创新速度

"嫁接"作为一种农业生产技术,在农业生产中被广泛运用,"嫁接"具有许多优点,可以减少人力、财力的投入,可以培育新品种,大大缩短植物开花结果的时间等等.     

中华猕猴桃两变种的比较形态研究

                                                                 摘    要     通过对中华猕猴桃(Actinidia chinensis planch．var．chinensis)和硬毛猕猴 桃(A．chinensis Planch．var．hispida C．F．Liang)的枝、果、叶、花粉等的比较 观察，发现它们在冬芽形状、花粉大小、果型及毛被情况等方面均有明显不同。 中华猕猴桃冬芽外露，呈马蹄状，为具毛的黄褐色鳞片所包裹；果多近圆形，枝及 果上具灰白色茸毛；花粉扁球形—近球形，17．5x 20微米，表面光滑。硬毛猕猴 桃冬芽为丘形，不外露，完全包裹于皮部之下；果多为长柱形，枝及果上具褐色长 硬毛；花粉扁球形—近球形，22．5x 25微米，表面具极模糊的细网状纹饰。     在雌株茎段的组织培养中，它们对培养基的反应也有显著差异，中华猕猴桃 茎段诱导产生愈伤组织的能力弱，再分化产生小苗的频率低(45.4%)，硬毛猕猴 桃的茎段，产生愈伤组织的能力强，再分化产生小苗的频率高(81．3%)。     鉴于它们在形态及组织培养中的这些不同，建议将硬毛猕猴桃由变种提升为种。     

Investigations on the melting and bending modulus of polymer grafted bilayers using dissipative particle dynamics

Understanding the influence of polymer grafted bilayers on the physicomechanical properties of lipid membranes is important while developing liposomal based drug delivery systems. The melting characteristics and bending moduli of polymer grafted bilayers are investigated using dissipative particle dynamics simulations as a function of the amount of grafted polymer and lipid tail length. Simulations are carried out using a modified Andersen barostat, whereby the membrane is maintained in a tensionless state. For lipids made up of four to six tail beads, the transition from the low temperature L(β) phase to the L(α) phase is lowered only above a grafting fraction of G(f)=0.12 for polymers made up of 20 beads. Below G(f)=0.12 small changes are observed only for the HT(4) bilayer. The bending modulus of the bilayers is obtained as a function of G(f) from a Fourier analysis of the height fluctuations. Using the theory developed by Marsh et al. [Biochim. Biophys. Acta 1615, 33 (2003)] for polymer grafted membranes, the contributions to the bending modulus due to changes arising from the grafted polymer and bilayer thinning are partitioned. The contributions to the changes in κ from bilayer thinning were found to lie within 11% for the lipids with four to six tail beads, increasing to 15% for the lipids containing nine tail beads. The changes in the area stretch modulus were also assessed and were found to have a small influence on the overall contribution from membrane thinning. The increase in the area per head group of the lipids was found to be consistent with the scalings predicted by self-consistent mean field results.     

毛鳞菊属（菊科）一新异名

在比较研究标本室标本，包括模式标本以及野外考察的基础上，确认Chaetoseris hispida Shih 与Ch. cyanea (D. Don) Shih为同种植物，并把前者作为后者的异名处理。     

柽柳属植物的染色体数目

The chromosome number of thirteen species of Tamarix L. in China is re- ported in this paper.  All of them have the same number (2n=24) and most of them are reported for the first time except T. hispida, whose chromosome number is the same as previously reported.     

中华猕猴桃两变种染色体数目的观察

 In the present paper, the somatic chromosome numbers of 2 varieties of Actinidia chinensis Planch. are counted as follows: A. chinensis var. chinensis 2n=58(2x), A. chinensis var. hispida 2n=ca. 174(6x).  Both numbers are reported for the first timefor the species.     

SiO_2接枝聚酰胺胺树枝状大分子在PS超临界CO_2发泡中的作用研究

在纳米SiO2表面引入聚酰胺胺树枝状大分子(PAMAM),再通过原子转移自由基聚合(A-TRP)合成了一种核-壳结构的SiO2-PAMAM-PS,将改性的纳米SiO2添加到PS基体中作为超临界CO2发泡的成核剂。红外光谱(IR)、差示扫描量热仪(DSC)、热重(TG)等结果表明,SiO2表面成功引入了PAMAM,并且接枝上了PS链段。透射电镜(TEM)显示该成核剂具有核-壳结构及其在PS基体中可以较均匀分散。将添加了改性SiO2的PS进行了超临界CO2发泡,利用扫描电镜(SEM)对泡孔结构进行了表征,结果表明:相比于纯发泡PS,成核剂的加入,改善了PS的泡孔结构,使泡孔尺寸显著减小,泡孔密度明显增加。     

Dielectrophoretic properties of engineered protein patterned colloidal particles

This work determines the dielectrophoretic response of surface modified polystyrene and silica colloidal particles by experimentally measuring their Clausius-Mossotti factors. Commercial charged particles, fabricated ones coated with fibronectin, and Janus particles that have been grafted with fibronectin on one side only were investigated. We show that the dielectrophoretic response of such particles can be controlled by the modification of the chemistry or the anisotropy of their surface. Moreover, by modelling the polarizabilities of those particles, the dielectric parameters of the particles and the grafted layer of protein can be measured.     

荔枝种植户采用高接换种技术影响因素实证研究——基于广东、广西186户荔枝种植户的调查

以广东省茂名市与广西省玉林市、钦州市16个县的186户荔枝种植户实地调研数据为依据,运用Binary regression logistic模型实证研究荔枝种植户采用高接换种技术影响因素,研究发现,荔枝生产年限、土地成本、销售价格、技术实施成本对荔枝种植户采用高接换种技术行为产生显著正向影响。     

Translocation of nanoparticles through a polymer brush-modified nanochannel

A basic understanding of the transport mechanisms of nanostructures in a polymer brush-modified nanochannel as well as the brush-nanostructure interactions at molecular level is important to design and fabricate emerging smart nano/microfluidic channels. In this work, we report coarse-grained molecular dynamics simulations of the translocation of nanoparticles through a cylindrical nanochannel coated with the polymer brush. The effects of the interparticle interaction and grafting density on the distribution and electrokinetic transport of nanoparticles are addressed in detail. Analysis of the distribution and velocity profiles of nanoparticles from the simulations indicate that the location of nanoparticles along the radial direction and their migration velocity are very sensitive to the change of interparticle interaction. We find complicated transport dynamics of nanoparticles under the influence of various grafting densities. The nanoparticles show markedly different translocation behavior upon increasing the grafting density, which depends on the counterion distribution, free room within the brush, nanoparticle-polymer friction, and brush configuration. Our results may serve as a useful starting point for the transport of nanostructures in polymer-modified channels and help to guide the design of novel smart nanofluidic channels for controlling the migration behavior of nanostructures.