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The bulky ortho-brominated aryl groups are implanted to create nonplanarity around amino center. Thus, the effective conjugation length to the protonation site is shortened and the energy gap between neutral and protonated forms is narrowed. The protonation can only occur at the nitrogen atom of the benzothiazole and the temperature variation disturbs the equilibrium between the neutral and monocation and the reverible thermochromic effect can thus be achieved.
在邻位的位置引入立体阻碍大的溴原子,进而控制质子化过程的酸碱平衡只发生在 benzothiazole 上的氮原子上,企图达到只有中性分子,与单阳离子两种稳定的形式存在,经由外界的刺激下,例如温度或酸的量的改变,促使逆反应的发生,而达到热致变色的效果。
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In order to expand economic growth,in 2000,the fectory signed a technical cooperation agreement with Wuxi No,1 Textile Nill which is a first class outstanding enterprise in China,introduced its advanced technology and management expetience,built a cotton yarn workshop with 40000 spindles.It manufactures pure cotton yarn of various specifications,mostly supplying Wuxi No.1 Textill to weave gray goods for export.Its inregral output is high,weaving efficiency is high,face reflection is good.It can meet the American 4-grade standard.The product enjoys high reputation in market and is sold well all over the country.It is well received and recognized by customers both at home and abroad
为开拓新的经济增长点,2000年该厂与国内一流优秀企业无锡市第一棉纺织厂签定了技术合作协议,引进无锡国棉一厂在国内较为领先的生产技术与管理经验,建成了4万纱绽的棉纱车间,生产各种规格纯棉棉纱,质量达到乌斯特97公报25%水平,大部分供应无锡国棉一厂织造出口坯布,整体产量高,织造效率高,布面反映好,完全可以达到美国4分制标准要求,产品市场信誉较高,畅销全国各地,得到了国内我客商学院一致好评和认可。
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No positive nitrogen balance was obtained after 7 days treatment of parenteral nutrition in the two groups.
治疗后两组均未达到正氮平衡,但研究组显示出较对照组更快达到正氮平衡的趋势。
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The conclusions were as follows: theνO-H andνC=O IR absorption maxima shifted towards higher wave numbers after imprinting 17β-estradiol on TFMAA-co-TRIM copolymer with the red shift of theνO-H groups being apparent after precipitation polymerization for 16h while that forνC=O groups being observed after polymerization for 24h. A strong interaction between TFMAA and 17β-estradiol was confirmed by the high selectivity for 17β-estradiol, as indicted by the values of the separation factor of isomers of 17β-estradiol/17α-estradiol (2.28) and the imprinted factor (3.01). Particle diameter of TFMAA-co-TRIM polymer was between 300 nm and 1.5μm, which suited well for solid phase sorbent throughout at low column pressure. The recognition of imprinting TFMAA-co-TRIM polymer for sterol molecules was driven by enthalpy eluted with acetronitile, and low temperature was in favor of the separation of sterol structure analogues on imprinting column. TFMAA-co-TRIM polymer possessed of determinate anti-heat stability, with melting point beginning at 255.84℃, Tp=257.40℃, control TFMAA-co-TRIM polymer and imprinting TFMAA-co-TRIM polymer were respectively decompounded at 267.79℃and 343.11℃, and solid micro-extraction noddle prepared by the special polymerization also showed definite recognition for 17β-estradiol by GC/MS detecting at 270℃. By selection of various washing and elution solvents, elution reagents of close polymerization system were of more advantage in template molecules retention and recognition on molecularly imprinted solid phase extraction column. At a certain extent, progesterone, 17α-estradiol, 17β-estradiol and 4-androstene-3, 17-dione could be intercepted on the MISPE column. Especially, MISPE had high selectivity for progesterone, and imprinting TFMAA-co-TRIM polymer could achieve adsorption balance within 50 min by absorption kinetics test for 17β-estradiol. However, MISPE column showed better selectivity and enrichment property for 17β-estradiol than C18 and CSPE columns according to the data from HPLC and GC/MS analyses. Recovery of 17β-estradiol on MISPE column was up to 85.5% while when prime extracting solution of milk powder was sampled, the recovery of CSPE and C18 columns were 43.7% and 30.7%, respectively.
通过研究阐明:紫外聚合产物TFMAA-co-TRIM中的νO-H振动吸收峰在聚合16h后红移,νC=O振动吸收峰在聚合24h后红移;TFMAA-co-TRIM对雌二醇异构体的印迹因子达到了3.01,α为2.28,优于其它功能单体参与得到的聚合物识别特性;TFMAA-co-TRIM聚合物粒径介于300 nm至1.5μm之间,作为色谱固定相具有良好的通量和低的柱压;在乙腈流动相中,TFMAA-co-TRIM分子印迹固定相的分离过程主要被焓驱动,低温有利于分子印迹固定相分离甾醇结构类似物;TFMAA-co-TRIM分子印迹聚合物在255.84℃时开始熔融,Tp=257.40℃,聚合物CP的降解温度在267.79℃,MIP降解温度在343.11℃,制备的固相微萃取头初步经GC/MS 270℃的耐热性测定;不同的洗提溶剂筛选证明了选择接近聚合溶剂的洗脱体系更有利于MISPE发挥识别效应;分子印迹固相萃取柱对孕酮、17α-雌二醇、17β-雌二醇和雄烯二酮都具有不同程度的保留特性,可作为此类化合物的吸附材料,特别对孕酮强保留的富集特性,可作为孕酮的选择性识别吸附剂,其分子印迹聚合物对17β-雌二醇的吸附动力学测定显示在50 min内基本达到吸附平衡,具有作为传感器核心敏感材料的潜力;对比萃取奶粉中17β-雌二醇性能,MISPE柱比非分子印迹固相萃取柱和C18柱具有更高的保留,回收率依次为85.5%,43.7%和30.7%。
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By adding new self or nonself to meet system need dynamically, and standing a clonal selection additionally in the system after adding new self or nonself, some detectors arriving to threshold can be activated, others are to die or wait to be activated.
通过新增自体或非自体来动态满足检测系统的要求,并在系统中再一次进行克隆选择,达到激活阀值的检测器才能被激活,而没有达到的或死亡,或等待被激活。
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At present, the CAD system for figured weaving recommended by most of computer companies can only save the amount of work for the designer to do in novation, or it is useful for education, but without any perfect results. The designer hopes to get better effects through trial production according to the difference of materials, silk yard twists, stitch structures and the rates of shrinkage.
CAD 设计系统比较适用在教育上,对生产企业开发新产品的设计人员来说只能起到减轻意匠的工作量,而不能达到设计人员根据自己所选择的原料结构不同、丝线粘度不同、组织结构不同、缩率不同等因素,而达到的最佳效果。
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Culture tender leaves in culture medium of MS+2,4-D1.5mg/L+30g/L suger+0.7% agar pH5.8 for 20 days in darkness at 25℃, and then subculture to induced Ⅱ-type calli. Use forceps cutting the tissue to nubble with 2mm2, and put the tissue into Agrodacterium tumefaciens LBA4404 liquid supplemented with AS 100mg/L,then, co-culture 3 days, resume 7 days in MS+2,4-D1.5mg/L+30g/L suger+500mg/L cef, take to MS+2,4-D1.5mg/L+30g/L suger+100mg/L cef+10.0mg/L kanamycin culture 20 days in darkness. After that to make it polarize in MS+30g/L suger+100mg/L cef+10.0mg/L km. The percentage of km resistant callus was reached max after infection for 45 min, the average is 29.66%. Simultaneity, tender leave callus are infected 5 min by A. tumefaciens liquid in different negative pressure, and kept on 15 min in Agrodacterium tumefaciens liquid without negative pressure. Then screen out resistant callus and obtain transgenic plants. When the negative pressure is -0.05MP the percentage of km resistant callus was reached max, the average rate is 37.5%.
将心叶接种于MS+2.4-D1.5mg/L+30g/L 蔗糖,琼脂0.7%,pH5.8 培养基中25℃暗培养20d 后继代一次,诱导产生Ⅱ型胚性愈伤组织,用镊子将其夹碎成2mm2大小的小块,置入添加100mg/L AS 的根癌农杆菌LBA4404 菌液中,侵染时间为45min,共培养3 天后,转入MS+2.4-D1.5mg/L+30g/L 蔗糖+500mg/L Cef 培养基中恢复7天,再转入MS+2.4-D1.5mg/L+30g/L 蔗糖+100mg/L Cef+10.0mg/L Km 中,遮光培养20d后,置入其MS+30g/L 蔗糖+100mg/L Cef+10.0mg/L Km 分化,卡那霉素抗性愈伤组织获得率在侵染45min 时达到最大值平均为29.66%;同时以甘蔗心叶愈伤组织材料,通过循环水式真空泵,产生负压,设定不同的负压值,在农杆菌菌液中感染5min 后,在负压条件下继续侵染15min 后,筛选出抗性愈伤组织并获得转化植株,其中在负压为-0.05 时转化率达到最大值,其卡那霉素抗性愈伤组织获得率平均为37.5%。
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Pass nerve of pair of layer of different hidden from view yuan numerary considers to discover, when concealed layer nerve yuan amount is achieved 100 when, emulation result and degree of experimental data likeness achieved 90% above, and nerve of the layer that follow concealed yuan number increase, training error drops speed is accelerated, but training rate slows, training time is lengthened.
通过对不同隐层神经元数目的探究发现,当隐层神经元数目达到100时,仿真结果和实验数据相似程度达到了90%以上,且随隐层神经元数目增多,练习误差下降速度加快,但练习速度变慢,练习时间延长。
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"What we hope to achieve is zero obesity, but we know this is difficult to do."
"我们希望达到的目标是零肥胖率,但是要达到这个目标很困难。"
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I'm not quite there yet, but I will be ready on Oct.
我现在还不确定达到了没有,不过10月31号我一定可以达到。
- 推荐网络例句
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She gently rebuff ed him, but agreed that they could be friends
她婉言拒绝了,但同意作为朋友相处。
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If in the penal farm, you were sure to be criticized.
要是在劳改农场,你等着挨绳子吧!
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Several theories about reigniting and extinguishing of the arc have been refered.
本文综合考虑了几种电弧重燃和熄灭理论。