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The interaction of chemical molecules and biological ones, especially sequence specific recognition and site-specific cleavage of DNA have many applications such as in DNA sequence determinations, chromosome analyses, gene therapeutics, and recombinant DNA manipulation. So it is significant to develop artificial enzymes for the scission of nucleic acid with high activity and selectivity at normal condition.

化学小分子与生物大分子的相互作用,尤其是人工核酸定位切断试剂对DNA的切断在DNA序列测定、染色体分析、基因治疗以及DNA重组方面有着广泛的用途,因此进行人工合成核酸定位切断试剂及其与DNA的相互作用的研究具有重要的理论意义和应用价值。

Forestry management methods on alleviation of autotoxicity in Chinese fir plantation were also studied. Root-stumps from last Chinese fir pure plantation have a negative effect on the replanted Chinese fir saplings because of phenolics from decomposing root-stumps.

本文还针对减轻杉木人工林化感自毒作用的林业经营措施进行了研究,发现杉木人工纯林中的采伐剩余物根桩对下茬杉木幼树的更新有不利的影响,这种不利的影响来自于根桩分解过程中释放的酚类化感物质。

Under the different sowing seeds way the soil ulmin, the alkaline hydrolysis nitrogen, the fast-acting phosphorus content present the tendency which in 0-40cm various soil layers increases along with the soil layer depth reduces, take 0-10cm soil layer soil content as biggest; The change tendency which the colleague mixes broadcasts mixes with the interlacing broadcasts the change tendency which the lawn fast-acting potassium presents reduces, after the unicast awnless brome lawn presents falls first, increases again falls, take 0-10cm and 20-30cm soil layer soil content as biggest, is 80, and achieves the extremely remarkable difference with other soil layers between; pH presents increases the tendency.

混播草地上牧草根系死亡后,能在土壤中遗留大量的有机质,在土壤微生物的作用下形成土壤腐殖质,其中有丰富的氮、磷、钾等元素。无芒雀麦,又名禾萱草,无芒草,是世界上分布较广,应用较多的优良牧草;是草地补播和建立人工草地的理想草种。无芒雀麦生长快,竞争力强,在杂草较多的草荒地上种植,也能获得成功,为我国温带和寒温带建造人工草地的当家草种。

For a 1116Kg chromitite and a 384Kg mantle peridotite sample, by heavy mineral separation and picking up under a binocular microscope following productions are obtained: the UHP minerals including moissanite and over 1000 diamond grains are discovered firstly from the Kangjinla chromitite orebody Cr-11, which is far more abundant than the Luobusa district; a series of unusual mantle minerals like moissanite and a great deal of diamond grains are discovered firstly from the host rocks of chromitite orebody Cr-11, providing the foundation of discussing the chromitite origin and its relation with the host rocks; besides the UHP minerals like moissanite and diamond, various special mantle minerals are revealed from the chromitite orebody Cr-11 and its host rocks including some native elements, alloys, oxides, sulphides, silicates, carbonates, and tungstates.

2人工重砂发现铬铁矿和地幔橄榄岩中的金刚石等特殊地幔矿物。1116 Kg铬铁矿和384Kg地幔橄榄岩大样经人工重砂分选和双目显微镜下挑选矿物,取得如下成果:首次在康金拉11号铬铁矿体中发现了上千粒金刚石,以及碳硅石等强还原环境的超高压矿物,数量远远超过在罗布莎铬铁矿矿区中发现的金刚石;首次在康金拉11号铬铁矿矿体的近矿围岩中发现了大量金刚石和碳硅石等一批异常地幔矿物,为探讨铬铁矿的成因及与近矿围岩地幔橄榄岩的关系奠定了基础;除挑选出金刚石和碳硅石等超高压矿物,在康金拉11号铬铁矿矿体与围岩地幔橄榄岩中还发现了自然铁球、金属互化物、氧化物、硫化物、硅酸盐等一批异常地幔矿物。

The relationship between weed invasion and intensity was analysed on sown pasture mixed by whiteclover and perennial ryegrass,and the preliminary results were that 1the number of invasive weeds ismainly dependent on grazing intensity;2the trend of species diversity was successively increase-decrease-increase when the grazing intensity is increase;3 principal invasion weed species are Lysimachiahemsleyana, Eragrostis nigra, etc,8 species;4the sown pasture in question is pioneer stage of the recoverysucce...

本文分析了白三叶草十多年生黑麦草混播人工草地上杂草入侵与放牧强度之间的关系,得出如下初步结论:1)杂草入侵的种数主要决定于放牧强度;2)α物种多样性随放牧加重而有增-减-增的趋势;3)入侵的主要杂草种为点腺过路黄等8个种;4)所论人工草地都处在恢复演替的先锋阶段,因而草地退化的进程还是能予以遏制的。

A greenhouse experiment was performed for one year to study the behaviour of Zn in artificial wastewater in simulated wetland system with one year old mangrove plant of Kandelia candel. Three different strenghts of the artificial wastewater were charged into the system in fixed quantity.

对温室中建立的含底泥、潮汐海水和1 a生秋茄苗的模拟湿地系统,分别用人工海水和不同Zn浓度的人工污水定时、定量进行持续1 a的污灌,以研究Zn在模拟系统中各部分的分配和系统对Zn的承受能力。

The objectives of the study were to: 1 reveal the responses of vegetation and soil to degradation by investigating community characteristics and soil physic-chemical properties; 2 quantify the contributions of human factors and natural factors and the relationship among the factors by analyzing the variation of each factor in past decades; 3 understand the succession of fenced undegraded meadow, artificial pasture, semi-artificial pasture and degraded meadow, and to 4 provide suggestions for restoration and rehabilitation of the degraded rangeland in the region.

本项研究旨在通过对黄河源区退化高寒草甸的植物群落特征和土壤特征调查,揭示植物和土壤养分对土地退化的响应;对源区人口及牲畜数量和国内生产总值,气候变化特点等因子的分析,量化人为干扰因子和自然因子的贡献率以及各因子之间的数量关系;以及对草地退化驱动力分析以及原生草地植被封育、人工草地、半人工草地的自然演替变化规律的研究,为高寒草甸退化草地恢复与重建提供科学依据。

Ackley is a bear of a guy with a side-of-the-mouth wisecracking delivery. He broke up 250 serious scientists at the 1990 Second Artificial Life Conference with a wickedly funny video of a rather important artificial life world he and colleague Michael Littman had made.

艾克利是壮得像头熊的家伙,一张大嘴巴总是妙语连珠。1990年第二届人工生命会议上,他播放了和同事迈克尔利特曼(2)一起制作的相当重要的人工生命世界的别出心裁的录像,迷倒了在场观看的250位严肃的科学家。

Ackley is a bear of a guy with a side-of-the-mouth wisecracking delivery. He broke up 250 serious scientists at the 1990 Second Artificial Life Conference with a wickedly funny video of a rather important artificial life world he and colleague Michael Littman had made.

艾克利是壮得像头熊的家伙,嘴角边吐出妙语连珠。1990年第二届人工生命会议上,他播放了和同事迈克尔利特曼(2)一起制作的相当重要的人工生命世界的别出心裁的录像,雷倒了在场观看的250位严肃的科学家。

Results TLC can be used for the identification in-vitro cultured Calculus Bovis and artificial Calulus Bovis, the samples containing cultured Calulus Bovis showed the specific spots of bilirubin but no hyodeoxycholic acid spot while the samples containing artifical Calulus Bovis showed the hyodeoxycholic acid spot but no bilirubin spot.

含人工牛黄的样品有猪去氧胆酸斑点,含体外培育牛黄的样品未检出有与猪去氧胆酸对照品相对应的斑点;含人工牛黄的样品不显胆红素斑点,含体外培育牛黄的样品显示与胆红素对照品相对应的斑点。

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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。

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