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71.
A kinetic reinvestigation of the title redox system in aqueous alkaline media at 35°C and an ionic strength of 0.5 mol dm?3 shows that the reaction follows a pseudosecond-order Fe(CN) disappearance. While varying [phenol]0 and [OH?] exhibit a linear influence on the pseudo-second-order rate constant, varying[Fe(CN)]0 and [Fe(CN)]0, initially taken, have a complicated inhibitory effect on the same. The major phenoloxidation products isolated under a chosen condition are 2,2′- and 4,4′- dihydroxydiphenyl. Results are interpreted in terms of a probable mechanism which envisages a reversible formation, by the first one-electron transfer, of a reactive phenoxy radical (PhO˙) which on the second one-electron transfer forms a less reactive ion-pair intermediate (stabilized by the Fe(CN) produced) to decompose rate-determiningly to phenoxonium cation (PhO+) and Fe(CN), the product-formation steps being very rapid and kinetically indistinguishable. 相似文献
72.
73.
Implementing strict glycemic control can reduce the risk of serious complications in both diabetic and critically ill patients.
For this reason, many different analytical, mainly electrochemical and optical sensor approaches for glucose measurements
have been developed. Self-monitoring of blood glucose (SMBG) has been recognised as being an indispensable tool for intensive
diabetes therapy. Recent progress in analytical instrumentation, allowing submicroliter samples of blood, alternative site
testing, reduced test time, autocalibration, and improved precision, is comprehensively described in this review. Continuous
blood glucose monitoring techniques and insulin infusion strategies, developmental steps towards the realization of the dream
of an artificial pancreas under closed loop control, are presented. Progress in glucose sensing and glycemic control for both
patient groups is discussed by assessing recent published literature (up to 2006). The state-of-the-art and trends in analytical
techniques (either episodic, intermittent or continuous, minimal-invasive, or noninvasive) detailed in this review will provide
researchers, health professionals and the diabetic community with a comprehensive overview of the potential of next-generation
instrumentation suited to either short- and long-term implantation or ex vivo measurement in combination with appropriate
body interfaces such as microdialysis catheters. 相似文献
74.
C. Radhakrishna Rao 《International Journal of Mathematical Education in Science & Technology》2013,44(3):295-312
It is interesting to apply methods devised for solving one class of problems to a second class to which the methods might at first appear alien. Two examples which illustrate this approach are given below. 相似文献
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It is becoming increasingly clear that mitochondria play an important role in neural function. Recent studies show mitochondrial morphology to be crucial to cellular physiology and synaptic function and a link between mitochondrial defects and neuro-degenerative diseases is strongly suspected. Electron microscopy (EM), with its very high resolution in all three directions, is one of the key tools to look more closely into these issues but the huge amounts of data it produces make automated analysis necessary. State-of-the-art computer vision algorithms designed to operate on natural 2-D images tend to perform poorly when applied to EM data for a number of reasons. First, the sheer size of a typical EM volume renders most modern segmentation schemes intractable. Furthermore, most approaches ignore important shape cues, relying only on local statistics that easily become confused when confronted with noise and textures inherent in the data. Finally, the conventional assumption that strong image gradients always correspond to object boundaries is violated by the clutter of distracting membranes. In this work, we propose an automated graph partitioning scheme that addresses these issues. It reduces the computational complexity by operating on supervoxels instead of voxels, incorporates shape features capable of describing the 3-D shape of the target objects, and learns to recognize the distinctive appearance of true boundaries. Our experiments demonstrate that our approach is able to segment mitochondria at a performance level close to that of a human annotator, and outperforms a state-of-the-art 3-D segmentation technique. 相似文献
77.
Spin wave dispersion relations in an antiferromagnetic ordered alloy of FePt3 were determined along three crystallographical axes by neutron scattering. Well defined magnon groups could be observed up to the magnetic zone boundary. The dispersion relation could be interpreted in terms of the Heisenberg model using more than four exchange parameters. 相似文献
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79.
Generalized inverses of a partitioned matrix are characterized under some rank conditions on the block matrices in the partitions. 相似文献
80.