Construction of a genetic map with SRAP markers and localization of the gene responsible for the first-flower-node trait in cucumber (Cucumis sativus L.)

With an F2 population from the cross of two cucumber inbred lines, S06 and S52, sequence-related amplified polymorphism (SRAP) was used to construct a genetic linkage map in cucumber (Cucumis sativus L.). Sixty-four SRAP primer combinations generated 108 polymorphic bands in the F2 population analysis. The average of polymorphic bands produced by one primer pair was 1.5, and the maximum was 5. Using Mapmaker 3.0, a linkage map was constructed, which consisted of 77 SRAP markers distributed in nine linkage groups (LOD≥3.0) and spanned 1114.2 cM with an average interval of 14.5 cM between markers. The gene for the first-flower-node trait, termed ffn, was mapped to linkage group Ⅸ, flanked by DC1EM5 and ME7EM2A at 10.3 cM and 12.1 cM distance, respectively.     

供热系统的集中运行调节

集中供热系统中，水温的调节至关重要，它是保证用户室内温度在任何室外温度下都能保持设计温度的关键。通过对比分析，着重介绍了分阶段改变流量的质调节方式的计算过程，指出这种调节方式是节约能源、使热用户室温相对稳定的调节方式。     

低温物性多功能测试系统

本文给出一套测量固体常用低温热参量的计算机控制多功能测试系统，可测量样品的电阻随温度的变化曲线Ｒ（Ｔ）、０～１．８×１０３ＭＰａ压力范围内电阻的温度特性Ｒ（Ｔ，Ｐ）、比热曲线Ｃ（Ｔ）及其ＡＣ磁化率，温区从液氮温度至室温．该系统集固体基本低温物性测量为一体，精度高，测量迅速、方便，为低温领域的物性分析（特别是高温氧化物超导体的研究）带来了极大的便利．     

钒酸铋黄色颜料的制备——推荐一个无机化学教学实验

该实验以Bi(NO_3)_3和NH_4VO_3为原料,采用液相沉淀法,制备钒酸铋黄色颜料。学生通过控制反应物初始浓度、溶液pH、温度与时间等条件制备分散性良好、颗粒细小、组成均匀的钒酸铋。实验涉及溶液配制、加热搅拌、简易回流、控温、调pH、检验、抽滤、洗涤、干燥等操作。钒酸铋是一种绿色环保的黄色颜料,且具有降解污染物的光催化性能,因此,该实验不仅对于提高学生无机制备实验能力具有很好的教学效果,还在实验教学中渗透了环保理念。     

低能极限下一些问题的探讨

阐述了相对质量和静止质量的相互关联问题．相对能量与相对质量的相互量度以及在低能极限下如何表达相对质量。     

可忽略损耗液相微萃取法同时测定辛醇-水分配系数和电离常数

以4-氯酚(4-CP)、2,4-二氯酚(2,4-DCP)和2,4,6-三氯酚(2,4,6-TCP)为模型化合物,建立了中空纤维膜支载-可忽略损耗液相微萃取法(HF-nd-LPME)和高效液相色谱(HPLC)联用,同时测定辛醇-水分配系数(Kow)和电离常数(pKa)的方法。在60 mL正辛醇饱和的样品溶液(1mmol/L NaH2PO4,2μg/mL4-CP、2,4-DCP和2,4,6-TCP)中放入2个支载有0.16μL正辛醇的中空纤维膜萃取装置,静置96 h确保达到萃取平衡。然后将萃取装置取出并用甲醇解吸,经HPLC测定得到萃取到正辛醇中的目标物浓度coctanol。coctanol与样品中目标物原始浓度cwater的比值即为Kow。通过测定模型化合物在不同pH3.0~13条件下的Kow值,并依据化合物的Kow、pKa与pH的关系模型进行非线性拟合,即可计算得出模型化合物pKa值。实验表明,本方法测定的三种模型化合物的Kow和pKa值与文献报道值一致。     

低渗透油田油井流入动态研究

现场资料表明,注水开发的油井在井底流压很低时,随着生产压差的增大,油井产液量并没有上升,而是下降,其流入动态曲线凹向压力轴,出现一个拐点。本文在考虑流动能力系数的基础上,修正了经典的Vogel方程,建立了新型油井流入动态模型。计算实例表明,当流压低到一定程度后,IPR曲线出现拐点,与现场生产实际情况符合。     

Continuous capillary electrophoresis with flow injection and its application for determination of Ephedrine and Pseudo-ephedrine in Chinese medicinal preparations

This article presents a new, simple and rapid continuous separation method by combination of flow injection with capillary electrophoresis designed for the analysis of basic traditional Chinese medicines. The device was produced using commercial capillary and components readily available in analytical laboratory. In double-T configuration, the designed horizontal separation channel was 25 microm i.d. x 146 mm length (an effective separation length of 93 mm) quartz capillary, with two vertical elicitation arms produced from 0.5 mm i.d. pump tubing. The capillary was embedded in a 40 x 20 x 3 mm organic glass base. Using the double-T configuration, continuous introduction of a series of samples was achieved. More than 3.00 resolution for ephedrine and pseudo-ephedrine were obtained using 100 mm borate buffer (pH 9.80) within 8 min in 25 microm separation channel with an electrical field strength of 137 V/cm (UV detection at 215 nm). The linear calibration range was 50-1500 microg/mL (ephedrine, r = 0.9982; pseudo-ephedrine, r = 0.9990) for both analytes. The limits of detection were 2.65 micro g/mL for ephedrine and 2.92 microg/mL for pseudo-ephedrine. In this device, the contents of ephedrine and pseudo-ephedrine in five Chinese medicinal preparations were determined with RSDs (n = 5) in range 1.16-4.51% and recoveries in range 90.4-114.6%.     

Polyethylene-polystyrene gradient polymers III. Mechanical and rheo-optical studies of relaxation processes

In this paper the structure correlation of PE-PS gradient polymers, modified by styrene LDPE films with their mechanical and rheo-optical properties, is presented. The specific structural changes of both the investigated materials can be demonstrated by using dynamic mechanical deformation studies. The influence of the penetrant on LDPE crystalline and amorphous phase order is shown. Some interesting mechanical behaviour of the gradient polymers, depending on the polystyrene contents, is discussed.