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We found that during the growth process the double steps first grow separately and the connected by short bridge before tangential growth. After eighth or ninth layer the spiral steps would merge into intact elliptic layers. At the merging point right-handed spiral sources might appear but the left ones always overgrow it which made the whole growth topography looked like left-handed apparently. It indicated that the EAFP molecules has strong ability to adjust itself to adapt the environment. 5. Through various analysis of interactions in the EAFP crystals it indicated that there were 218 residue interactions between 12 symmetry-related EAFP molecules around one EAFP molecule, 18 strong ones and 72 weak ones .

EAFP在低过饱和度下的螺旋生长过程中会出现台阶的合并,从而表现出单-双的螺旋台阶,在小范围扫描中捕获到了这种现象,使得对螺旋生长台阶的合并过程有了更加深入的认识;并且台阶的生长受到沿晶体学b轴方向上的21螺旋对称的控制;当台阶生长至第八到第九层时,螺旋台阶会自动地形成完整的生长层,这充分说明了EAFP分子或分子簇具有良好的自身调节能力,这样在晶体生长过程中,晶体的缺陷减少,晶体质量提高,这也可说明EAFP晶体的x射线衍射能力很强的原因。

In Polymer, helix is a quite universal configuration Recent experiments show thatsome polymers such as bacterial flagellar filaments can form bistable helices in ionsolutions, which means that left handed helix and right handed helix can coexist in thesame environment The mechanism of this phenomenon has not been explainedsatisfactorily.

在高分子中,螺旋是一种很普遍的高分子组态。近来实验发现,一些高分子,如细菌鞭毛丝,在离子溶液中能够形成双稳态螺旋,即左螺旋与右螺旋在相同的条件下能够同时存在。

Since Watson and Crick have brought forward the model of DNA helix structure and explain about it's reproduce mechanism in molecule level, research work concerning DNA has been continuously lucubrated. However, whether translating inheritance information and rebuilding DNA molecule via menstruating DNA sequence, or to date the most compelling gene project, chromosome protract et. al, there all need a sort of molecule scissors cleaving DNA, DNA cleavage reagent. At present, tool enzyme of cleaving DNA is mostly DNA restriction enzymes founded in 70 years, which only cleave DNA at specific 4-8 base pair sequences that are usually palindromic, so this restricts the at very fast speed developing of gene technology at certain extent.

自从Watson和Crick提出DNA的双螺旋结构并对其复制机制在分子水平上进行解释后,使得对DNA的研究不断深入,但无论是通过测定DNA的序列来破译遗传信息、改造DNA分子,还是目前最令人关注的基因工程、染色体绘制等,都需要一种断裂DNA分子的&剪刀&——DNA断裂试剂,目前断裂DNA的工具酶主要是上个世纪70年代发现的DNA限制性内切酶,但所知的Ⅱ型限制性内切酶的DNA序列识别长度较短(约为4~8个碱基对),而且一般要求回文结构,这就给飞速发展的基因工程技术带来一定的限制。

Electrically charged specks of interstellar dust organize into DNA-like double helixes and display properties normally attributed to living systems, such as evolving and reproducing, new computer simulations show.

最新的计算机模拟显示:星际尘埃中带有电荷的微粒排列成类似 DNA 的双螺旋状,并展现出只有生命系统才具备的特性,如进化和繁衍。

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公司专业生产选矿设备,提供工艺流程,选矿实验,安装指导13697077005www.lzkysb.cn温良禹0797-5745599溜槽,螺旋溜槽,玻璃钢螺旋溜槽,玻璃钢溜槽,选矿溜槽,选矿螺旋溜槽,萤石浮选设备,旋转螺旋溜槽,玻璃钢旋转螺旋溜槽,旋转溜槽,江西螺旋溜槽,江西溜槽,石城螺旋溜槽,石城溜槽, BLL溜槽, BLL型玻璃钢螺旋溜槽, 5LL螺旋溜槽,公司生产的螺旋溜槽,玻璃钢螺旋溜槽,玻璃钢旋转溜槽,玻璃钢旋转螺旋溜槽有BL,LL,CBX等系列BL的特点是新型复合断面,超短螺距,大直径,宽断面,特别适于原矿的拖泥及非金属,金属矿物细粒级(-0.2毫米)的分选,不需冲水,具有结构简单,无需动力,重量轻,占地面积小,处理量大,分选效率高,LL的用于选别粒度0.3-0.02毫米的铁锡,钨,钽,铌,煤矿,金矿,独居石,金红石,锆英石及具有足够比重差的其它矿物CBX对于选别钽,铌,锡,钨,金,钛,铁和其它比重差大于1的矿物锯齿波跳汰机,隔膜跳汰机,旁动式跳汰机,侧动式跳汰机,下动式跳汰机,双室隔膜跳汰机,选矿跳汰机,动筛跳汰机,锯齿波大颗粒跳汰机,JT跳汰机,选金跳汰机,选金机,选锡跳汰机,重选跳汰机,公司生产的跳汰机,单斗跳汰机,隔膜跳汰机,双斗跳汰机,锯齿波矩形跳汰机,锯齿波梯形跳汰机,左式和右式跳汰机有JT,LTS等各种系列,该机是固定筛子式,适用于选别金属矿石,如钨,含金的砂矿,精选锡矿等,也可用于选细粒物料和粗粒物料,最大给矿粒度为30毫米。

Double helix model significance, not only means that has verified the DNA member structure, it also has prompted more importantly the DNA duplication mechanism: As a result of the gland fat ling always with the thymine pair, the bird fat ling always with the cytosine pair, this explained that two chain's basic group orders are each other supplementary, so long as had determined a chain's basic group order, another chain's basic group order also determined.

双螺旋模型的意义,不仅意味着探明了DNA分子的结构,更重要的是它还提示了DNA的复制机制:由于腺膘呤总是与胸腺嘧啶配对、鸟膘呤总是与胞嘧啶配对,这说明两条链的碱基顺序是彼此互补的,只要确定了其中一条链的碱基顺序,另一条链的碱基顺序也就确定了。

The main production facilities consist of four seafood production workshops (total building area is about 6950 square meters and storage capacity is about 4000 tons )and three quick freezing room which made up aluminum plate (10 tons /each batch) and one ice-making workshop (its daly output of 35 tons )and one ice storage (total building area is about 350 square meters)and two fresh-freeing installation (the processing capacity is 1500kg/h)and one tunnel quick-freeing installation (the processing capaciyy is 600kg/h)and two production lines for processing shrimp and two production lines for cooking seafood and two production lines for processing fish and one flake ice maker(its daiy output of 35 tons)The plant built a laboratory for testing product quality,which had equipped with all equipments and instruments.

主要生产设施有:生产车间有4间,面积共有6950平方米;冷库5间面积共有3000平方米,储存量约4000吨;10吨/次铝板冷结间3间,原料保鲜库2间约250吨,日产35吨冰的制冰车间10间,储冰库350平方米。主要加工设备有:1500kg/h双螺旋单冻机2套;600kg/k隧道式单冻机1套;虾生产线2条;熟虾生产线2条;鱼生产线2条以及日产10吨片冰机1台。工厂建设有独立的产品质量检验室,配套完善的检验仪器设备,并拥有一批多年从事出口水产品加工和贸易,具有丰富实践经验的技术人员,能够适应现代水产品加工发展的需要。

The central 5, 5'-disubstituted bipyridine units of each ligand coordinate theNi or Fe ion, while all the terminal 6-monosubstituted bipyridine units of the ligands keep free of coordination, as the result trinuclear triple-stranded helicate 〓 can not form. This is considered to be caused by the steric hindrance of the methylene substituents α to the chelating nitrogens of the terminal bipyridine units and the strain caused by linkage mode.

配体L〓与Ag作用得到〓,两个配体链相互缠绕着两个Ag离子周围形成双股螺旋结构并以头尾式排列(见图3),由于配体中位于配位N原子α或β位的末端甲基或次甲基取代基的空间位阻阻碍了头对头式异构体的形成,也正是由于配体头尾式排列而使Ag双股螺旋得以形成,这一结果表明该螺旋体的组装过程中自发地采取了空间阻碍尽可能小的那个构型。

In retrospect, we can conclude that the double helix model had played a Key role in the development of modern biological sciences.

回顾20世纪生物科学发展的主要路线和过程,可以清楚地看到, DNA 双螺旋模型在其中所处的承上启下的关键位置和所起到的核心作用。

The two strands of the double helix are linked by pairs of nucleic acids like the treads in a spiral staircase.

这个双螺旋结构的两股之间是由成对的核酸联结的,它们就像螺旋式楼梯中的踏步板。

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