青天葵中鼠李秦素在不同溶剂的紫外-可见吸收光谱测定

对青天葵中鼠李秦素不同溶剂的紫外-可见吸收光谱测定研究,考察其紫外-可见吸收光谱的特征。分别以甲醇溶液、甲醇钠甲醇溶液、三氯化铝甲醇溶液、三氯化铝盐酸甲醇溶液、醋酸钠甲醇溶液、醋酸钠硼酸甲醇溶液为溶剂,分别对其进行紫外-可见光谱测定。鼠李秦素在不同溶剂的紫外-可见吸收光谱图有所区别。本法可作为鼠李秦素紫外-可见吸收光谱特征鉴别的依据。     

一种商贸名称为“泰国猫眼”宝石的特征及鉴定

针对近期瑞丽珠宝市场上出现的商贸名称为"泰国猫眼"的饰品,采用常规宝石学测试、红外吸收光谱、拉曼光谱、X-射线荧光光谱、紫外-可见光谱对其材料属性、物质成分及鉴定特征进行研究。红外光谱及拉曼光谱测试均显示非晶态SiO_2的振动模式特征,表明为一种人工玻璃制品,具有平行纤维状结构及黑色长针状包体。化学成分分析表明主要组分为SiO_2,约占70.25%,次要组分有PbO、K_2O、CaO、Al_2O_3、Fe_2O_3、BaO、MnO、ZnO,其金黄体色由微量的Fe、Mn元素所致。依据国标《珠宝玉石名称》GB/T16552-2017应定名为玻璃猫眼。区别于普通玻璃猫眼的特征是具有"乳白-蜜黄"效应,从侧面透光观察可见到大量分布稀疏的多边形的褐-黑色斑点,无"蜂巢状"纤维结构。     

高斯多峰拟合用于混合表面活性剂十二烷基硫酸钠和吐温80临界胶束浓度的测量

报道了可见吸收光谱线型的高斯多峰拟合用于混合表面活性剂十二烷基硫酸钠(SDS)和吐温80临界胶束浓度的测定.具体的做法是以碱性品红(Fuchsin)为探针,测量固定浓度的吐温80对一系列浓度的SDS-碱性品红水溶液体系的可见吸收光谱.其光谱特征是碱性品红二聚体吸收峰和单体吸收峰叠合在一起.用高斯多峰拟合实现了体系可见光...     

5-（4-琥珀酰胺基）苯基-10,15,20-三苯基卟啉及其锌配合物的制备及光谱研究

合成了5-（4-琥珀酰胺基）苯基-10,15,20-三苯基卟啉配体（H2P）及其锌配合物（ZnP）,通过元素分析、质谱、紫外可见吸收光谱、核磁共振氢谱、红外光谱等测试方法对其结构进行确认,并对H2P和ZnP的拉曼光谱进行了研究。结果表明,H2P和ZnP的紫外可见吸收光谱、红外光谱及拉曼光谱都有很大区别。     

制药工程专业实验阿法依伯汀的谱学分析与指认

利用Gaussion 09W软件在DTF/B3LYP 6-311+G水平下优化并计算了新型基因兴奋剂促红细胞生成素阿法依伯汀(EPO)的四大分子光谱:紫外-可见吸收光谱,红外吸收光谱,拉曼吸收光谱以及核磁共振吸收光谱;计算了22种常见单取代衍生物的氢和氧原子信息指数,讨论了其在马拉松运动员体液酸碱性(p Ka)检测中的预报应用。所得结果可协助对阿法依伯汀分子光谱理解及体液检测。     

哌罗匹隆治疗精神分裂症药理作用的理论研究

密度泛函理论是深入理解物质性质的有力工具。选取哌罗匹隆为研究对象,优化得到其稳态构型,计算其Mayer和Wiberg键级、红外吸收光谱、紫外-可见吸收光谱、分子轨道和能级、以及Hirshfeld原子电荷等信息,结果表明哌罗匹隆的活性点位可归属于~(26)N原子,从而为进一步解释其药理学行为奠定化学基础。     

抗艾滋病药地达诺辛光学活性的模拟与标注

基于量子化学理论的基组和方法,对抗艾滋病药物地达诺辛分子的紫外-可见吸收光谱,红外吸收光谱,核磁共振吸收氢和碳光谱等进行了计算与标注。自然原子轨道电荷和前线分子轨道图模拟表明,杂环胺基官能团上的氮和氢原子可能是其生理活性的反应位。     

紫外可见吸收光谱法测定蔬菜中亚硝酸盐含量

采用中性红紫外可见吸收光谱法对蔬菜中的亚硝酸盐含量进行测定，并与经典法萘乙二胺法进行比较。实验结果表明：中性红紫外可见吸收光谱法的线性范围是0-1.2μg／mL，摩尔吸光系数是7732.6L·cm^-1·mol^-1，测定结果令人满意。     

一种新型萘并吡喃的合成及光致变色性能的研究

以4,4’-二甲基二苯甲酮为原料,经过Stobbe缩合,酸化,Claisen缩合等反应合成了新型的萘并吡喃衍生物—13-丁基-6,11-二甲基-3,3’-二苯基-3,13-二氢萘并并吡喃[2,1-f]-13-醇(NP),其结构经1H NMR、13C NMR、FT-IR以及元素分析进行表征。并对其紫外-可见吸收光谱进行了研究。结果表明:化合物NP在紫外可见吸收光谱中具有较长的吸收波长、较强的耐疲劳性和较快的消色速度。     

光/电信号响应的阴离子受体设计与合成

设计合成了光/电信号响应的阴离子受体——二茂铁乙酮-2,4-二硝基苯腙(FcNH)。利用紫外-可见吸收光谱和电化学循环伏安法探讨了其对阴离子识别作用。光谱实验表明,二氯甲烷溶液中引入F-,受体分子吸收光谱发生显著红移,溶液的颜色由黄色变为紫红色,其他阴离子(Cl-、Br-、I-、HSO-4、H2PO-4、CH3COO-等)加入,吸收光谱几乎没有变化,表明受体分子对F-有高选择性识别作用,能够"裸眼"识别F-。电化学实验证明,当F-加入,CV曲线发生明显的变化,设计合成的分子是F-电化学响应受体。摩尔连续法(Job-Plot)测定了主客体配合比为1∶1,非线性拟合计算得到配合物结合常数K a>105,初步探讨了主客体结合机理。     

Phase Constitution During Sintering of Red Mud and Red Mud–Fly Ash Mixtures

The phase constitution during the sintering of pure red mud and red mud–fly ash mixtures was studied in the temperature range of 900°–1250°C. The phases formed at different sintering temperatures were analyzed by X-ray powder diffraction. The phases that are likely to form at equilibrium at any isotherm were predicted using the Gibbs free energy minimization technique and the databases provided in the FactSage software. Although the thermodynamic prediction is in reasonable agreement with the experimental results for the major phases, there is some disagreement regarding the minor phases, especially the more complex phases. The major limitation of the thermodynamic approach presently is the non-availability of thermodynamic data for several complex and multi-component solution phases.     

红

<正>评委感言:本月"红"这个主题很迎合春节和情人节的喜庆浪漫气氛。本次投稿作品,都抓住了"红"的色彩含义,表现丰富,通过色彩对比,很多中国元素都得到了表现。但在"红"的意境表现上,作品略显单调,尤其是中国传统文化中     

Physicochemical Properties of Red Salmon Oil (<Emphasis Type="Italic">Oncorhynchus nerka</Emphasis>) and Microencapsulated Red Salmon Oil Added to Baby Food

Unpurified red salmon oil (UPSO) was processed to obtain purified salmon oil (PSO) by chitosan adsorption. Both unpurified and purified oils were evaluated for peroxide value (PV), free fatty acids (FFA), fatty acid methyl esters (FAME), moisture, and color. An emulsion system containing PSO (EPSO) was prepared; the system was analyzed for color, rheological properties and microstructure before spray drying to produce microencapsulated PSO (MPSO). MPSO was analyzed for moisture, water activity, bulk density, color and FAME composition. PSO or MPSO was added to a commercial baby-food product (CB) and all baby-food samples were compared for PV, FFAs, FAME, and color. Experiments were completed in triplicate and data statistically analyzed (α = 0.05). PSO had higher percentages of total omega-3, total monounsaturated DHA, and EPA than MPSO. EPSO exhibited viscoelastic characteristic and the droplet size of EPSO was 1–9 μm. Total omega-3 and total monounsaturated contents of the MPSO were lower than PSO. All baby-food samples with added fish oils had similar color. DHA and EPA contents of baby food were increased over three fold by the addition of PSO and/or MPSO. MPSO can be added to CB resulting in increasing total percent omega-3 fatty acids while maintaining desirable attributes of the CB.     

Far‐Red Fluorogenic Probes for Esterase and Lipase Detection

Fluorogenic enzyme probes go from a dark to a bright state following hydrolysis and can provide a sensitive, real‐time readout of enzyme activity. They are useful for examining enzymatic activity in bacteria, including the human pathogen Mycobacterium tuberculosis. Herein, we describe two fluorogenic esterase probes derived from the far‐red fluorophore 7‐hydroxy‐9H‐(1,3‐dichloro‐9,9‐dimethylacridin‐2‐one) (DDAO). These probes offer enhanced optical properties compared to existing esterase probes because the hydrolysis product, DDAO, excites above 600 nm while retaining a good quantum yield (?=0.40). We validated both probes with a panel of commercially available enzymes alongside known resorufin‐ and fluorescein‐derived esterase substrates. Furthermore, we used these probes to reveal esterase activity in protein gel‐resolved mycobacterial lysates. These probes represent new tools for esterase detection and characterization and should find use in a variety of applications.     

Red phosphorus–controlled decomposition for fire retardant PA 66

The thermal degradation and the combustion behavior of glass fiber–reinforced PA 66 materials containing red phosphorus were investigated. Thermogravimetry (TG), TG coupled with FTIR, and TG coupled with mass spectroscopy were used to investigate the thermal decomposition. The flame retardant red phosphorus was investigated with respect to the decomposition kinetics and the release of volatile products. The combustion behavior was characterized using a cone calorimeter. Fire risks and fire hazards were monitored versus external heat fluxes between 30 and 75 kW/m². Red phosphorus acts in the solid phase and its efficiency depends on the external heat flux. The use of red phosphorus results in an increased amount of residue and in a corresponding decrease in total heat release. The decrease of the mass loss rate peak results in a corresponding decrease of the peak heat release. With increasing external heat flux applied the first effect on the total heat release decreases linearly, whereas the second effect on the peak heat release expands linearly. The investigation provides insight into the mechanisms of how the fire retardant PA 66 is achieved by red phosphorus controlling the degradation kinetics. Taking into account that a decrease of the volatile products also leads to a decrease of heat production in the flame zone and that the char acts as heat transfer barrier, a reduced pyrolysis temperature is suggested as a further feedback effect. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2060–2071, 2002     

巡摄在天

为了拍摄令人肾上腺素激增的航空表演照片,航空摄影师EJ·Van·Koningsveld乘上红箭飞行表演队的飞机,在不断翻腾中按下快门。任务档案任务执行:55岁的EJ·Van·Koningsveld对航空摄影抱有极大的热情并环游世界拍摄飞行表演队的照片。任务内容:EJ拍摄了许多地面上和飞行中的飞机。他最知名的作品是红箭飞行表演队的照片。任务地点:EJ来自荷兰的泽西特。任务装备:佳能EOS 7D、佳能EOS 550D、佳能EOS 50D、佳能EF-S 17-55mmf/2.8 USM IS、佳能EF 15mm f/2.8鱼眼镜头、三阳8mm鱼眼镜头。更多信息请登录:www.sky-flash.com/reds.htm或www.raf.mod.uk/reds/galleries/ej2011.cfm     

Red Glaze

The compositions for red glazes with lustrous and dull surfaces are provided. These glazes can be fritted or unfritted. The fritting temperature is 800°C, and the firing temperature is 750 – 800°C. The red glaze contains the complex silicate material Erevanite-10.