The antiarrhythmic and antiinflammatory activity of a series of tricyclic pyrazoles

A series of tricyclic pyrazoles were prepared from intermediates available from steroid total synthesis and tested for antiarrhythmic and antiinflammatory activity.     

丰中子核113Ru集体转动带的识别

通过对重核²⁵²Cf自发裂变产生的瞬发γ谱的测量,对非常丰中子核¹¹³Ru的能级结构进行了研究,建立了较高自旋态的能级纲图,识别了基于中子h_11/2轨道激发产生的集体转动带,最高自旋态达31/2h.还发现了另一个可能基于9/2^－能级的集体转动带,对新建立的¹¹³Ru的集体带的一些重要特性进行了讨论.     

Kinetics and mechanism of the autoxidation of pentaerythrityl tetraheptanoate at 180–220°C

A kinetic and mechanistic study of the autoxidation of liquid pentaerythrityl tetraheptanoate (PETH) at 180–220°C has been carried out utilizing a stirred-flow reactor. The results are consistent with the occurrence of a chain reaction scheme similar to that proposed for n-hexadecane autoxidation, namely, the formation of monohydroperoxides by the intermolecular abstraction reaction (3), the formation of α,γ- and α,δ-dihydroperoxides and α,γ- and α,δ-hydroperoxyketones by intramolecular peroxy radical abstraction reactions (4) and (4*), the bimolecular termination of peroxy radicals, reaction (6), and the rapid conversion of α,γ-hydroperoxyketones to the corresponding cleavage acids and methyl ketones, reaction (7). Comparisons of various rate parameters for the n-hexadecane and PETH systems reveal that the values of k₇ and (k₃/H atom)/(2 k₆)^1/2 are within experimental uncertainties identical for the two systems at 180°C. The proposed reaction scheme includes the concurrent formation of hydroxy radicals and hydroperoxyketone species. The results of kinetic analysis and the experimentally observed isomer distributions of primary and secondary monohydroperoxide products at high and low oxygen pressures suggest that ≈60% of the hydrogen abstractions from PETH at high oxygen pressures occur by hydroxy radicals.     

Ion-selective electrodes responsive to chlorocobaltate(II) ions

The response characteristics of some electrodes sensitive to chlorocobaltate(II) ions are reported. The most reliable electrode, which showed near-Nernstian response in the range 10^-1–10^-4 M cobalt(II), was obtained by using a membrane consisting of 35% poly(vinyl chloride), 5% Aliquat chloride, and 60% of the blue oil obtained by extraction of cobalt with Aliquat-336, with conventional internal reference system.     

Qualitative and quantitative gas liquid chromatography of triglycerides.

This article reviews the methodology required for triglyceride analysis by gas liquid chromatography. Compositions of the animal and vegetable triglyceride mixtures to which this technique has been applied are summarized.     

Theoretical analysis and experimental investigation of pulsed tunable forsterite laser

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Neutron reflectivity study of adsorbed diblock copolymers

Summary In this paper, we summarize our cumulative work on neutron reflectivity studies of polystyrene-poly(vinyl-2-pyridine) (PS-PVP) and polystyrene-polyethylene oxide (PS-PEO) adsorbed at a quartz-solvent interface. Deuterated toluene was chosen as the solvent since it is a good solvent for PS and a poor one for either of the other two blocks. In this case, the polystyrene dangles into the solvent while the other block acts as an anchor. The neutron reflectivity studies reveal that the form of the polymer density profile normal to the substrate may be varied from an extended ?brush? to a condensed ?mushroom? conformation by manipulating the ratio of the molecular weights of the two blocks. In addition, we present new data on the PS-PEO system in a poor solvent, deuterated cyclohexane, under conditions of shear flow in Poiseuille geometry. We find that when the PS-PEO diblock is absorbed from cyclohexane and is allowed to relax, the PS chain takes on a ?mushroom? conformation. However, when the shear is applied, the layer shear thickens due to the PS chains extending to nearly twice their original lengths. Paper presented at the I International Conference on Scaling Concepts and Complex Fluids, Copanello, Italy, July 4–8, 1994.