生长调节剂对金边玉簪丛生芽诱导影响的研究

以芽为外植体建立了金边玉簪组织培养的技术体系,重点研究了激素配比对玉簪丛生芽诱导的影响,并有效防止外植体褐变、玻璃化的问题。结果表明,金边玉簪的培养条件为:温度(26±1)℃,光照12 h/d,光照强度2 500 lx左右,pH值5.8～6.0,丛生芽诱导培养基以MS NAA4.0 BA0.1(mg/L)为好,30 d后启动率可达95%。     

超级市场的卖场设计

超级市场的卖场设计已越来越被经营者所重视。传统的设计正逐步被淘汰。现在的设计开始更多地考虑顾客的需求。卖场的出入口、通道、卖点、商品陈列和卖场气氛等方面的设计正趋于人性化、煽动性。本文拟从这几个方面对超级市场的卖场设计进行探讨。     

自适应脉冲耦合神经网络在图像处理中应用

尽管Johnson 提出的PCNN模型具有强大的图像处理功能,以时间序列进行特征提取时具有旋转、尺度、平移、扭曲不变性,可实践中发现依然存在着不足,特别对图像亮度、对比度比较敏感.添加了误差反向传播(Error Back Propagation, EBP)学习准则的自适应脉冲耦合神经网络模型能自适应设定模型参数,是脉冲耦合神经网络模型研究的主要内容.特别地,应用这种自适应模型进行特征提取时,能弥补原来PCNN模型对亮度、对比度敏感的缺陷,而且具有一定的泛化能力,有效克服了亮度、对比度对图像识别精度的影响.     

Synthesis and characterization of monodispersed inorganic/organic core/shell microspheres with fluorescence

In recent years, the semiconductor nanocrystals （NCs） have attracted great interest due to their potentials in photonics, electronics, magnetics and catalysis, and the monodispersed organic or inorganic microspheres doped NCs display predominant characteristics in the fabrication and study for photonic crystals, and considerable effor thas been devoted to the design and synthesis of CdTe NCs doped colloid with well fluorescencet.     

Clinical and genetic analysis of two Chinese families with benign familial neonatal convulsions

Benignfamilialneonatalconvulsions(BFNC)is arareautosomaldominantinheritedepilepsysyn dromecharacterizedbyunprovokedpartialorgeneral izedseizures.Theseizuresusuallyoccurfromthesec onddayofbirthtothesixthmonthandremitsponta neouslyafterseveralweekstomonths.Mostindivid ualsareseizure freebytheageofsixmonths.The serumchemistryandneuroradiologicalexaminations,interictalelectroencephalogram(EEG),andpsy chomotordevelopmentareusuallynormal.However,10%to15%ofpatientshavetheriskofseizurere currencela…     

Synthesis and Crystal Structure of New Supramolecular Adducts of[PtCl_6]~(2-) with Cucurbit [7] uril:[(H_3O)_2 [PtCl_6]_3 [C_(42)H_(42)N_(28)O_ (14)_2·H_2O

0　IntroductionCucurbit [n]urils (Qn ,Fig .1.)arecyclicoligomersofnunitsofglycolurillinkedby 2nmethylenebridgesderivedfromformaldehyde.Theypossessacharacteristicannularshape,withtwoidenticalcarbonyl fringedportals[1 ,2 ] .Themostcom moncucurbituril,Q6 ,wasreportedtoaccommodatedifferentguestssuchaswater[3] ,THF[4 6] ,xenon[7] ,pyridium[8] andp xylyenediammonium[3] ionsandsoon .ThealkyldiaminesthreadthroughtheQ6 ,andformtherotaxanestructures[9 1 3] .Metalions[1 ,3 6 ,1 4 ,1 5] andclusters[8,…     

Prototype test study on mechanical characteristics of segmental lining structure of underwater railway shield tunnel

Based on the first unde rwater railway shield tunnel, the Shiziyang shield tunnel of Guangzhou Zhu- jiang River, the prototype test was carried out against its segmental lining structure by using ＂multi-function shield tunnel structure test system＂. And the mechanical characteristics of segmental lining structure using straight assembling and staggered assembling were studied deeply. The results showed that, the mechanical characteristics of segmental lining structure varied with the water pressures; especially after cracking, the high water pressure played a significant role in slowing down the growing inner force and deformation. It also testi- fied that the failure characteristics varied with straight assembling structure and staggered assembling structure. Shear thilurc often occurred near longitudinal seam when using straight assembling.     

A Rhodamine-Based Sensor-for Chromogenic Detection of Cu^2＋ and Fluorescent Detection of Fe^3＋

A rhodamine-benzimidazole conjugate(RB) as a probe was investigated.UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu~(2+),while other transition metal ions induced a little more absorption.The absorption value of RB solution at 552 nm has a linear correlation with Cu~(2+) concentration between 35-70 μmol/L;the detection limit reached 6.82×10~(-2) μmol/L,which is lower than the settled limitation for copper in the drinking water(~30 μmol/L) standardized by World Health Organization(WHO).Moreover,FL analysis showed that only Fe~(3+) could induce large fluorescence intensity enhancement at 582 nm;other common metal ions including Cu~(2+) cannot induce the enhancement.There was a good linear correlation between relative fluorescence intensity and Fe~(3+) concentration ranging from 2 μmol/L to 20 μmol/L,and the detection limit reached1.70×10~(-2) μmol/L.The results showed that RB could detect Cu~(2+)and Fe~(3+) simultaneously,with the UV-Vis and fluorescence spectroscopy,respectively.