Most silk gene transcription factors belong to HOX and FOX family,the bHLH transcription factors are uncommon.
通过基因芯片数据的检索,我们发现了在家蚕丝腺特异表达的并且含有bHLH结构域的转录因子——Bmdimm和Bmsage,bHLH(螺旋-环-螺旋)结构域能与DNA特异结合从而调控基因的表达,其中Bmdimm在后部丝腺特异表达,Bmsage在中部和后部丝腺特异表达。
After the spiral rings are set up,the original tube boundary layer is destroyed.
研究结果表明:分叉管路分叉点为一扰动源,会诱导附加湍流;管内设置螺旋环后,原管壁边界层遭到破坏,管壁邻近的气流经过螺旋环时,发生边界层的分离,在分离区形成涡流,使气流湍流度增加;火焰阵面进入螺旋环扰动区后,发生扭曲并产生褶皱,火焰表面积显著增加,燃烧速率增大,并相应增加了释热速率,诱导激波的产生。
A new intuitional diagram,spiral ring,is obtained by this method and its attributes were studied.
提出新的无向双环网络G(N;±r,±s)的直径求解法———分步法;并得到一种新的直观图———螺旋环,研究了螺旋环的性质;给出了无向双环网络的直径d(N;±r,±s)的显式公式;给出了N,s都固定的直径算法;在N固定,且2≤r
A new diagram,spiral ring whose attributes were studied,was obtained by this method.
提出新的无向双环网络G(N;±1,±s)的直径求解法——分步法,并得到一种新的直观图——螺旋环,研究了螺旋环的性质,给出无向双环网络的直径d(N;±1,±s)的显式公式,给出N,s都固定的直径算法。
In this paper, (R)- and (S)-2,2'-diethynyl-1,1'-binaphthyl with highly stable chiral configurations were em- ployed as structural templates, and a new type of helical cyclophane compounds (R,P)-3 and (S,M)-3 were synthesized in enantiopure form by the introduction of benzyl sulfone through Sonogashira coupling reac- tion, followed by the treatment of disulfone with lithium diisopropylamide (LDA).
基于2,2'-二取代的联萘衍生物在手性构型上高度稳定的特点,分别从光学活性的(R)-和(S)-2,2'-二乙炔基-1,1'-联萘结构模板出发,通过Sonogashira偶连反应导入苄基砜,然后用二异丙基氨基锂(LDA)处理制得的联萘二砜成功地合成了一种新的螺旋环芳分子——对映异构体(R,P)-3和(S,M)-3。
Design of rotation ring for rotating abortive apparatus;
旋动式人工流产器旋流环的设计
The working principle, the structure and the constitution of the rotation ring for the artificial abortion apparatus are introduced.
介绍旋动式人工流产器的工作原理、结构及组成,探讨旋流环的制备方法。
Classification and Function of the Basic Helix-loop-helix Protein Class
螺旋-环-螺旋蛋白家族的分类和功能
spiral part of a screw
（螺钉的）螺旋部分.
helical gear with helix angle
带螺旋角的螺旋齿轮
paranemic spiral
平行螺旋，反向双股螺旋
helical curve [ line ]
螺旋曲线螺旋(取向)照相
curled or wound (especially in concentric rings or spirals).
卷曲的（同心环或螺旋线）。
ring with coil-spring expander
螺旋弹簧胀圈活塞环
fixed pitch propeller
定螺距螺旋桨固定螺距螺旋桨
Of or having the shape of a helix;spiral.
螺旋形的，螺旋（线）的（拥有）螺旋形或螺旋线的；螺旋的
A spiral formation, such as one of the whorls of a gastropod shell.
螺旋形一种螺旋形状，如一个涡螺壳上的螺旋
hydrauliccontrol pitch propeller
液压操纵螺距螺旋桨
controllable pitch propeller oil pump
可调螺距螺旋桨油泵
controllable pitch propeller control box
可调螺距螺旋桨控制箱
fixed screw propeller shrouding
定螺距螺旋桨导流管
controllable pitch propeller hub
可调螺距螺旋桨桨毂
mechanical controllable pitch propeller
机械式可调螺矩螺旋桨
A jack operated by a screw.
螺旋起重机，螺旋千斤顶由螺旋杆运作的起重机
propeller,esp of a ship or motor boat
螺旋桨（尤指船的）