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helical     
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  螺旋
     The Flow of Power-Law Fluid in a Helical Pipe
     幂律流体在螺旋管道内的流动
短句来源
     Research for Milling with Non-instantaneous-pole Envelope Theory Applying Technology of Complex and Abnormal Helical Surface
     复杂异形螺旋曲面无瞬心包络铣削理论及应用技术研究
短句来源
     Study of Multisection Helical CT Perfusion Imaging for Pancreatic Diseases and Angiogenesis in Pancreatic Neoplasm
     多层螺旋CT胰腺病变灌注成像与肿瘤血管生成的研究
短句来源
     Dynamical Analysis of Helical Spring
     圆柱形螺旋弹簧的动力分析
短句来源
     Residual Stress in Helical Spring and Calculation of Fatigue Strength
     圆柱螺旋弹簧中的残余应力及疲劳强度计算
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  螺旋形的
     1. The purification of SMR1The proteins SDS-PAGE analyses of the wild-type Arthrospira platensis strains Sp-S, Sp-B and Sp-T with regular helical morphology, and their corresponding linear varieties and the revertant varieties were performed. The results indicated that there were 5 significantly different bands in common between the helical and linear filaments, which were located at 53.1, 52.0, 31.8, 21.9 and 20.3 kDa, respectively.
     一、SMR1的分离与纯化通过对3株节旋藻原螺旋形藻丝、由螺旋形变直的藻丝,以及直线形回变成螺旋形的藻丝所作的蛋白质SDS-PAGE分析表明,螺旋形与直线形藻丝间至少存有5个差异蛋白,分别位于53.1、52.0、31.8、21.9和20.3 kDa处。
短句来源
  螺旋状的
     The helical Sn- (n = 14~20) structures are also calculated.
     另外也计算了螺旋状的Sn- (n = 14~20)的结构。
短句来源
     Objective SARS coronavirusSARS-CoV Nucleocapsid N proein is a structural protein of SARS-CoV which binds viral RNA to form the helical nucleocapsid.
     目的:SARS冠状病毒(SARS-CoV)的核衣壳蛋白(N蛋白)能够结合病毒RNA形成螺旋状的核衣壳。
短句来源
     In addition, there are some intrinsic special properties like rotary polarization, bragg reflection, polarized light dichroism of CLC because of its helical molecular structure.
     而且其螺旋状的分子排列结构,使其还具有它本身特有的光学特性,如旋光性、选择性反射特性(布拉格反射)和偏光二色性。
短句来源
     There are commonly the helical structures in the celestial body from many gigantic whirl nebulae to small meteoric stone and dust falling to the Earth.
     天体中, 从众多的硕大的旋涡状星云, 到坠落于地球上的微小的陨砂、陨尘, 普遍存在着螺旋状的结构形态。
短句来源
     According to the special molecular structure of cholesteric liquid crystals,the optical properties of cholesteric liquid crystals, including rotary polarization,selective light scattering,polarized light dichroism,and so on were expounded synthetically, their optical properties based on their helical molecular structure and their optical anisotropy were revealed.
     基于胆甾相液晶的特殊分子结构 ,综合阐述了胆甾相液晶的旋光性、选择性光散射和偏振光二色性等光学特性 ,揭示了它的光学特性主要源于它螺旋状的分子结构及其光学各相异性。
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  螺旋的
     CONCLUSION The results indicate that [(L 1) 2SnEt 2] can selectively bind to the N 1 atom of the base and the phosphate oxygen atom of AMP and may further destroy the helical structure of DNA, while the dimethyltin(IV) compound of 1,3 dimethyl 4 acetyl 5 pyrazolone [(L 1) 2SnMe 2] merely binds to the the phosphate oxygen atom of AMP and causes the contraction of DNA helical structure.
     结论3 二甲基 4 乙酰基 5 吡唑酮的二乙基锡配合物 (L1 ) 2 SnEt2 可与AMP的碱基N1 和磷酸根氧原子螯合并可能会破坏DNA的双股螺旋结构 ; 而二甲基锡配合物 (L1 ) 2 SnMe2 易与单核苷酸的磷酸氧结合 ,难以与单核苷酸的碱基氮原子稳定结合且只引起DNA双股螺旋的收缩
短句来源
     The self-assembly and structural ch aracterization of the new iron(Ⅲ) molecular helix Fe 2 L 3 was achieved from an inexpensive and easy-to-prepare bis-bidentate Schiff base ligand,H 2 L,[(HO)(C 10 H 6 )CH =N-N =CH(C 10 H 6 )(OH)]. The triple helical Fe 2 L 3 molecule contains two iron*#atoms and three ligands.
     本文选择了2-羟基-1-萘醛与水合肼形成的席夫碱,犤(HO)(C10H6)CH=N-N=CH(C10H6)(OH)犦,作为配体,设计组装了双核三螺旋的三价铁配合物。
短句来源
     Through the stressed analysis to slippage transition interface,it shows that when the sum of pile angle θ and rolling angle α approaches 180°,material is likely to roll from one side of helical to the other side.
     通过对滑移过渡界面的受力分析,表明当物料堆积角θ与翻滚角α的和接近180°时,物料就可能从螺旋的一边翻滚到另一边。
短句来源
     2. The study of bacterial flagellar bundlingConstruct the model of left-handed helical filament built on multi triangular prisms which are connected by springs.
     2.细菌鞭毛绑定成束机理仿真研究以多节弹簧三菱柱构造左旋螺旋的鞭毛模型;
短句来源
     The backfire characteristics of a monofilar helix and the radiation characteristic of the paraboloidal reflector antenna with a backfire helical feed operating at C band are studied.
     研究了C波段单线背射螺旋的背射特性及其作为抛物面馈源的辐射特性。
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      helical
    Stability Estimates for Helical Computer Tomography
          
    In this article we analyze an inversion formula for helical computer tomography proposed earlier by the author.
          
    Synthesis and structures of new helical, nanoscale ferrocenylphenyl amides
          
    Closed surface modeling with helical line measurement data
          
    It includes three steps: first, the cloud data are preprocessed for smoothing; second, a helical line is segmented to form triangle meshes; and third, Bezier surface patches are created over a triangle mesh and trimmed to shape on an entire surface.
          
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    The effect of irradiation by X-rays, without the exclusion of oxygen, on the molecular structureof calf thymus DNA has been studied. The reduced viscosity (η_(sp)/c) was decreased and themolar extinction coefficient (ε_(260mμ)) increased with increasing X-ray dosage at a definite doserate. Besides these apparent effects, there were, as deduced from studies on heat-lability, alsohidden damages in the DNA macromolecule, even with dosage as low as 1×10~4r. Whileη_(sp)/cand e26anu of the unirradiated DNA remained...

    The effect of irradiation by X-rays, without the exclusion of oxygen, on the molecular structureof calf thymus DNA has been studied. The reduced viscosity (η_(sp)/c) was decreased and themolar extinction coefficient (ε_(260mμ)) increased with increasing X-ray dosage at a definite doserate. Besides these apparent effects, there were, as deduced from studies on heat-lability, alsohidden damages in the DNA macromolecule, even with dosage as low as 1×10~4r. Whileη_(sp)/cand e26anu of the unirradiated DNA remained unchanged after incubahon in 0.2M NaCl at76'C for 60 min., the irradiated DNA uPOn incubation shovvcd further decreases in V,./c and in-crea5es in ε_(260mμ). This decreased stability of the irradiated DNA towards heating revealed that,in addition to the disruption of some of the hydrogen-bonds in DNA immediately upon irradia-tion, a labilization of other hydrogen-bonds has also occurred. A protective agent, probably Ca-citrate, was found to be present in the stock solution of DNA.In the presence of this protective agent, the η_(sp)/c of DNA remained constant after 6×10~4rand decreased slightly after 12×10~4 r irradiation, with no significant changes in ε_(260nμ). However,the hidden damage was not prevented and it developed to greater extents with increasing dosages. Samples which suffered only hidden damages provided comparatively simple systems for theinvestigation of the nature of primary events occurring upon irradiation and their bearing on theapparent degradation of the DNA molecule. In the presence of the protective agent, the dose-effect curves based on η_(sp)/c measurements showed that, preceding the appearance of degradation,there was an apparently stable phase during which the hidden damage was actually developing, asevidenced by the increased heat-lability. This suggested that the hidden damage may involve the disruption of one of the chains ofthe double-helical structure of DNA, causing the breakagc of the hydrogen-bonds near the pointsof main-chain damage, rendering the other hydrogen-bonds unstable toward 76℃ incubation, andeventually resulting in the degradation of the macromolecule as an accumulative effect. Provided that there is no essential difference between the direct and the indirect action of X-rays on DNA, the mechanism suggested above could also account for the process of degradationproduced in the absence of the protective agent, which probably acts only in the neutralization offree-radicals produced from water by irradiation. The mechanism of the action of Ca-citrate as a protective agent for DNA and the significanceof the hidden damage of the DNA macromolecule in the primary and cumulative hiological effectof radiation were also discussed.

    (1)用X射线照射小牛胸腺DNA溶液,以还原粘度和紫外吸收光谱的变化为指标,证明射线对DNA大分子除有直接显露的降解之外,还可导致对76度保温不稳定性的出现。这反映了结构上隐藏破坏的存在。隐藏破坏与所接受照射的剂量成比例地增加。(2)按Zamenhof法制备的DNA样品储存液中合有“保护物质”。在“保护物质”的存在下,DNA溶液可耐受6×10~4r的照射而无直接显露的降解发生。但隐藏破坏却不可避免,在一定剂量下可以单独地存在,并随剂量之增加而发展,当剂量增加到一定程度时,显露的降解随之出现。(3)“保护物质”是可透析的,它具有抗射线的作用,而不是保全已遭受降解的DNA的大小外形。实验结果表明“保护物质”可能是钙-柠檬酸盐。讨论了钙-柠檬酸盐保护作用的机制。(4)比较隐藏破坏单独存在和与直接显露的降解同时存在的实验结果表明,隐藏破坏的本质包括了:1)主链的单侧打断,2)部分氢键的破坏,3)残余氢键不稳定性的增加。在三者之间有平行的比例关系。主链的打断可能是后二者出现的原因。分子的直接降解可能又是隐藏破坏积累的结果。(5)在“保护物质”存在下照射DNA,为人工制造隐藏破坏,研究DNA的结构与功能提供了一个简便的方...

    (1)用X射线照射小牛胸腺DNA溶液,以还原粘度和紫外吸收光谱的变化为指标,证明射线对DNA大分子除有直接显露的降解之外,还可导致对76度保温不稳定性的出现。这反映了结构上隐藏破坏的存在。隐藏破坏与所接受照射的剂量成比例地增加。(2)按Zamenhof法制备的DNA样品储存液中合有“保护物质”。在“保护物质”的存在下,DNA溶液可耐受6×10~4r的照射而无直接显露的降解发生。但隐藏破坏却不可避免,在一定剂量下可以单独地存在,并随剂量之增加而发展,当剂量增加到一定程度时,显露的降解随之出现。(3)“保护物质”是可透析的,它具有抗射线的作用,而不是保全已遭受降解的DNA的大小外形。实验结果表明“保护物质”可能是钙-柠檬酸盐。讨论了钙-柠檬酸盐保护作用的机制。(4)比较隐藏破坏单独存在和与直接显露的降解同时存在的实验结果表明,隐藏破坏的本质包括了:1)主链的单侧打断,2)部分氢键的破坏,3)残余氢键不稳定性的增加。在三者之间有平行的比例关系。主链的打断可能是后二者出现的原因。分子的直接降解可能又是隐藏破坏积累的结果。(5)在“保护物质”存在下照射DNA,为人工制造隐藏破坏,研究DNA的结构与功能提供了一个简便的方法。

    (1) Experiments confirm that the treatment of BSA with NBS in urea-acetate buffer of pH 4.1-4.2 results in the splitting of the peptide chain specifically at tryptophenyl bonds, and that the new N-terminal amino acids are serine and glycine.(2) The molecules of BSA are found to form aggregates partly after NBS treatment as shown by increase in both molecular weight (from 65,000 to 110,000) and intrinsic viscosity (from 0.041 to 0.076). Electrophoretic pattern of the NBS treated sample shows the appearance of...

    (1) Experiments confirm that the treatment of BSA with NBS in urea-acetate buffer of pH 4.1-4.2 results in the splitting of the peptide chain specifically at tryptophenyl bonds, and that the new N-terminal amino acids are serine and glycine.(2) The molecules of BSA are found to form aggregates partly after NBS treatment as shown by increase in both molecular weight (from 65,000 to 110,000) and intrinsic viscosity (from 0.041 to 0.076). Electrophoretic pattern of the NBS treated sample shows the appearance of a new peak.(3) No significant change is shown in specific optical rotation, indicating the helical content of the BSA molecule remains unaltered.(4) The agar diffusion and quantitative precipitin reaction show that the antigenicity of BSA decreases considerably after NBS treatment.

    (1)牛血清清蛋白在pH=4.1—4.2的醋酸-脲缓冲液中经15moles/mole BSA的NBS处理后,色氨酸肽键处断裂,出现新N-末端氨基酸,用叔戊醇及1.6M磷酸系统双相层析证实分别为丝氨酸及甘氨酸。(2)NBS处理后之BSA分子量由正常65,000增加到110,000。特性粘度由正常0.041上升至0.076,说明分子有部分聚合现象,在电泳图谱上出现一个新的峰。(3)BSA经NBS处理后此旋光度无变化,说明螺旋程度未发生明显的改变。(4)琼脂扩散及免疫定量实验结果显示NBS处理后BSA的抗原性减弱。

    The expressions of radiation field in terms of a Fourier series for helical antenna, along which a single progressive wave of so-called T1 Mode current propagated, are obtained. It is proved that these series converge rapidly. A method of the approximate calculation of the radiation pattern for axial helical antenna is presented.

    本文对圆柱形螺旋线上存在单个T_1模行波时辐射场解的级数展开问题作了处理,得到了一个广义富氏级数的展开式,证明了它是收敛的。同时也证明了Kraus提出的但未予证明的多匝螺旋天线方向性的计算方法是正确的。最后讨论了方向图的近似计算问题和一个实例。

     
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