DETERMINATION OF MOLECULAR WEIGHTS BY DISTRIBUTION EXPERIMENTS1.

Determination of molecular weights by fluctuation spectroscopy: application to DNA.

A method for determining molecular weights of macromolecules by measuring spontaneous concentration fluctuations is described. The method is absolute, rapid, and requires no shearing forces on the molecules. We have applied this technique to the determination of molecular weight of DNA molecules. The molecular weight values obtained for T2 phage DNA (1.14 X 10(8)) and replicating Escherichia co...

Acoustic Determination of Polymer Molecular Weights and Rotation Times

An acoustic waveguide device was shown to be sensitive to the molecular weight of poly(ethylene glycol) in solution over a molecular weight range determined by the operating frequency of the device. The acoustic device used generates a shear wave with displacement in the plane of the device surface and normal to the direction of propagation. Liquid over the device exhibits viscous coupling to t...

modeling loss data by phase-type distribution

بیمه گران همیشه بابت خسارات بیمه نامه های تحت پوشش خود نگران بوده و روش هایی را جستجو می کنند که بتوانند داده های خسارات گذشته را با هدف اتخاذ یک تصمیم بهینه مدل بندی نمایند. در این پژوهش توزیع های فیزتایپ در مدل بندی داده های خسارات معرفی شده که شامل استنباط آماری مربوطه و استفاده از الگوریتم em در برآورد پارامترهای توزیع است. در پایان امکان استفاده از این توزیع در مدل بندی داده های گروه بندی ...

Determination of Molecular Weights of Dextrans by Means of Alkaline Copper Reagents

Reducing values were determined for samples of clinical dextrans, gentiobiose, and isomaltose with several alkaline copper reagents. The results for t he dextrans were converted to number-average molecular weights on the assumption th a t eq uimolecular quantities of dextran , isomaltose, and gentiobiose have approximately the same reducing power . The molecular weights, t hus obtained , are in...

Modeling Spatial Distribution of Intracellular Organelles by Molecular Motors