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1.
Molecular mass distribution of sodium alginate by high-performance size-exclusion chromatography 总被引:8,自引:0,他引:8
Ci SX Huynh TH Louie LW Yang A Beals BJ Ron N Tsang WG Soon-Shiong P Desai NP 《Journal of chromatography. A》1999,864(2):199-210
A sensitive high-performance size-exclusion chromatography (HPSEC) method with simple UV detection was developed for the molecular mass analysis of sodium alginate. It was used to evaluate alginates of varying molecular mass and the results were compared with the viscosity measurements. This HPSEC method was sensitive to serve as the stability indicating method for alginate after storage under different conditions. The information of relative molecular mass distribution of alginate was provided with reference to pullulan molecular mass standards. The comparison of the HPSEC chromatograms of alginate, pullulan and dextran revealed the effect of chemical composition of a polysaccharide and its effect on apparent molecular mass distribution. 相似文献
2.
Consider equations of the form where q is in general a complex vector and the function F depends nontrivially both on q and on qy. We show that a family S of such equations can be investigated by the inverse scattering method. If an equation (*) belongs to S, the function F depends linearly on q and algebraically on qy. We show that the family S contains a subfamily in which each equation can be obtained from the two dimensional Toda lattice equations by a Bäcklund transformation. 相似文献
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The generalized wave equations and generalized sine-Gordon equations are known to be associated to linear spectral problems. In this paper we show that the geometric Backlund transformation for the nonlinear equations corresponds to changing the discrete part of the scattering data for the linear problems. 相似文献
5.
Exact propagators are obtained for the degenerate second order hyperbolic operators ∂2
t
-t
2l
Δ
x
, l=1,2,..., by analytic continuation from the degenerate elliptic operators ∂2
t
+t
2l
Δ
x
. The partial Fourier transforms are also obtained in closed form, leading to integral transform formulas for certain combinations
of Bessel functions and modified Bessel functions. 相似文献
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Richard Beals 《纯数学与应用数学通讯》1974,27(2):161-205
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