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161.
合成了二十员大环双氮杂冠醚:2,3,l6,l7—二苯—l,8,ll,18—四氧—5,14—二氮杂环二十烷及其7个与稀土硝酸盐(RE^3 =La^3 ,Sm^3 ,Eu^3 ,Gd^3 ,Tb^3 ,Dy^3 。Yb^3 )所形成的1:2(M:L)型固体配合物,并经过红外光谱、元素分析、摩尔电导及热分析等方法对配合物进行了表征.结果表明,配位是通过配体中的C—O-C进行的,而Ar—O-C未参与配位,同时含2分子配位水.对Sm(Ⅲ),Eu(Ⅲ),Tb(Ⅲ),Dy(Ⅲ)的配合物进行了荧光光谱测定,所有配合物均有较强的荧光强度,其中Tb(Ⅲ)的配合物荧光强度最高,表明该新双氮杂冠醚配体三重态的能量与Tb(Ⅲ)的振动能级最为匹配. 相似文献
162.
BP网络应用于黄河水质的预测研究 总被引:8,自引:1,他引:8
利用黄河兰州段水质指标浓度时间序列作为学习样本,选取了DO、COD、氨氮、重金属离子等l0项指标作为输出参数,运用人工神经网络BP模型中的Levenberg—Marguardt优化算法对学习样本优化建模,将优化好的网络的预测结果与实测结果进行了比较,表明BP网络可以很好地用于黄河水质指标值及水质类别的预测。 相似文献
163.
语义抽象概念aggregation和generalization不仅对不包含时间概念的复杂情况的数据模型的建立很有用,而且还可以成功地用于连续事件的建模。建立了两种情况并存的语义数据模型:or—dering(次序)和sequencing(先后顺序),并且可以在任何程序环境下实现。 相似文献
164.
基于河南登封早二叠世肾掌蕨Chiropteris reniformis Kawasaki和髻籽羊齿Nystroemia pectiniformis Halle有机连接的标本, 确立了肾髻籽羊齿(新组合)Nystroemia reniformis (Kawasaki) comb.nov.营养叶具长柄, 肾形, 基部心形, 全缘或具细齿; 叶脉细, 多次二歧分叉并结为多边形或菱形细网.生殖枝在苞片腋部着生.苞片与营养叶同形.胚珠器官在叶性器官腋部着生或两者分别不规则地着生于生殖枝的轴上.极多的具翼双角籽倒圆锥形, 呈两列状排列, 珠孔朝上.该植物代表了一种新的已灭绝的裸子植物. 相似文献
165.
In modernindustry thin film on the substratc has much important role to decide the properties ofproduct especially for electrical optical wear-resistant etc production. There aresome technical methods to prepare thin film including plasma spray physical vapordeposition 《广西师范大学学报(自然科学版)》2003,21(Z4):284-285
In modern industry,thin film on the substratc has much important role to decide the properties of product, especially for electrical, optical and wear-resistant etc, production. There are some technical methods to prepare thin film,including plasma spray,physical vapor deposition (PVD),chemical vapor deposition (CVD) and sol-gel,etc. Among of them,sol-gel method has been developed a popular tech nique for preparing thin films. 相似文献
166.
H. Yamagishi 《Cellular and molecular life sciences : CMLS》1996,52(6):583-586
The heart beat of early juveniles of the littoral isopodLigia exotica occurred at a frequency of 250 to 350/min, associated with rhythmic activity of the heart muscle. Each burst was composed of a slow depolarizing potential with superimposed spike potentials. The spike potential was eliminated by perfusion with TTX-containing or Na+-free saline. In TTX-saline, the slow potential was unchanged in frequency and amplitude. By current injection into the heart muscle, the rhythm of the slow potential was phase-shifted and its frequency was changed in a membrane potential-dependent manner. These results show that the heart ofLigia early juveniles acts as an endogenous muscle oscillator generating oscillatory slow potentials and Na+-dependent spikes. 相似文献
167.
Antioxidant survey to assess antagonism to redox stress using a prokaryotic and an eukaryotic system
H. Baker B. DeAngelis O. Frank M. Khalil S. H. Hutner E. R. Baker 《Cellular and molecular life sciences : CMLS》1996,52(6):597-599
Using a prokaryote (Escherichia coli) and a metazoa-resembling eukaryote (Ochromonas danica), we surveyed antioxidants which might overcome redox stress imposed by menadione sodium bisulphite (MD) and buthionine sulphoximine (BSO). BSO oxidant stress was evident only inO. danica; MD oxidant stress was evident in both organisms. Glutathione, its precursors, e.g. cysteine, homocysteine, and 2-oxo-4-thiazolidine carboxylic acid, and red blood cells, emerged as prime antioxidants for relieving BSO and MD oxidant stress. BSO and MD oxidant activity and antioxidant-annulling effect inO. danica were judged comparable to those found in animal cells whereas the resultsE. coli were not entirely equivalent. TheO. danica system emerged as a practical, rapid, and useful system for pinpointing oxidant stressors and antioxidants, and shows promise for studies with mammalian systems. 相似文献
168.
E. S. Fiala R. S. Sodum M. Bhattacharya H. Li 《Cellular and molecular life sciences : CMLS》1996,52(9):922-926
Reaction with peroxynitrite at pH 7.4 and 37°C was found to increase the 8-oxodeoxyguanosine levels in calf thymus DNA 35-38-fold. This oxidation of deoxyguanosine, as well as the peroxynitrite-mediated nitration of tyrosine to 3-nitrotyrosine, was significantly inhibited by ascorbic acid, glutathione and (–)-epigallocatechin gallate, a polyphenolic antioxidant present in tea. For 50% inhibition of the oxidation of deoxyguanosine to 8-oxodeoxyguanosine, 1.1, 7.6 of 0.25 mM ascorbate, glutathione or (–)-epigallocatechin gallate, respectively, was required. For 50% inhibition of tyrosine nitration, the respective concentrations were 1.4, 4.6 or 0.11 mM. Thus, (–)-epigallocatechin gallate is a significantly better inhibitor of both reactions than either ascorbate or glutathione. Reaction of (–)-epigallocatechin gallate with peroxynitrite alone resulted in the formation of a number of products. Ultraviolet spectra of two of these suggest that the tea polyphenol and/or its oxidation products are nitrated by peroxynitrite. 相似文献
169.
Associations with ants, termed myrmecophily, are widespread in the butterfly family Lycaenidae and range from mere co-existence to more or less specific mutualistic or even parasitic interactions. Secretions of specialized epidermal glands are crucial for mediating the interactions. Transfer of nutrients (carbohydrates, amino acids) from butterfly larvae to ants plays a major role, but manipulative communication with the help of odour signals is also involved. By means of myrmecophily, lycaenid butterflies largely escape ant predation, and certain species gain protection through attendant ants or achieve developmental benefits from ant-attendance. Benefits to the ants range from minimal to substantial food rewards. While most lycaenid species maintain facultative relationships with a variety of ant genera, highly specific and obligatory associations have convergently evolved in a number of butterfly lineages. As a corollary, communication systems are largely unspecific in the former, but may be highly specialized in the latter. The sophisticated communication between obligate myrmecophiles and their host ants is tightly connected with the evolutionary rise of specialized life-cycles and thus is a source of augmenting diversity within the butterflies. 相似文献
170.
Concept of an extracellular regulation of muscular metabolic rate during heavy exercise in humans by psychophysiological feedback 总被引:12,自引:0,他引:12
H. -V. Ulmer 《Cellular and molecular life sciences : CMLS》1996,52(5):416-420
Efferent motor signals to skeletal muscles concern not only the space/time pattern of motion, but also the setting of muscular performance and through this the control of the current metabolic rate. For an optimal adjustment of metabolic rate during heavy exercise — e.g. in athletic competitions — a feedback control system must exist, including a programmer that takes into consideration a finishing point (teleoanticipation). The presented experiments, using Borg's scale, indicate the existence and functioning of a system for optimal adjustment of performance during heavy exercise and the relevance of teleoanticipatory effects. Thus motor learning includes not only somatosensory control, but also metabolic control. With regard to migratory birds, such metabolic control would have to operate in the individual as well as in the migrating flock as a whole. 相似文献