Fine Structure of Viscose Rayon Related to Cellulose Concentration and Degree of Polymerization in Viscose Solution

Impacts of temperature, shear rate, cellulose concentration and DP proportion on rheological behavior of cellulose/NMMO•H2O solution were investigated in this paper; especially put forward a method of mixing different DP cellulose at different proportion to discuss more accurately effect of DP. The results shown that the flow activation energy of 4% cellulose/NMMO•H2O was 24.45kJ/mol, and the temperature 85～115°Cwas suited for its processing. All kinds of cellulose solution with different DP were the pseudoplastic fluid, and had shear thinning characteristic, especially high DP. The cellulose concentration was higher, apparent viscosity of its solution was bigger, but their relationship was not linear. Under the same cellulose concentration, the solution viscosity increased generally in proportion to DP rising, but the solution with proportion 1:1 was one exception, and its viscosity is relatively high.

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Method for determining the amylose content, molecular weights, and weight- and molar-based distributions of degree of polymerization of amylose and fine-structure of amylopectin

Carbohydrate Polymers ◽

10.1016/j.carbpol.2007.01.018 ◽

2007 ◽

Vol 69 (3) ◽

pp. 562-578 ◽

Cited By ~ 55

Author(s):

Ming-Hsuan Chen ◽

Christine J. Bergman

Keyword(s):

Fine Structure ◽

Amylose Content ◽

Degree Of Polymerization ◽

Molecular Weights

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Fine Structure of Platelet Interaction with a New Microcrystalline Collagen Preparation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100050305 ◽

1974 ◽

Vol 32 ◽

pp. 58-59

Author(s):

W. H. Zucker ◽

R. G. Mason

Keyword(s):

Fine Structure ◽

Platelet Aggregation ◽

Hydrochloric Acid ◽

Whole Blood ◽

Platelet Adhesion ◽

Hemostatic Agent ◽

Native Collagen ◽

Fibrillar Morphology ◽

Clinical Interest ◽

New Form

Platelet adhesion initiates platelet aggregation and is an important component of the hemostatic process. Since the development of a new form of collagen as a topical hemostatic agent is of both basic and clinical interest, an ultrastructural and hematologic study of the interaction of platelets with the microcrystalline collagen preparation was undertaken.In this study, whole blood anticoagulated with EDTA was used in order to inhibit aggregation and permit study of platelet adhesion to collagen as an isolated event. The microcrystalline collagen was prepared from bovine dermal corium; milling was with sharp blades. The preparation consists of partial hydrochloric acid amine collagen salts and retains much of the fibrillar morphology of native collagen.

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Pituitary Follicular Cells: Their Origin, Possible Function and Fate

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100050184 ◽

1974 ◽

Vol 32 ◽

pp. 34-35

Author(s):

E. Horvath ◽

K. Kovacs ◽

G. Penz ◽

C. Ezrin

Keyword(s):

Fine Structure ◽

Secretory Granules ◽

Follicular Cells ◽

Human Pituitary ◽

Rat Pituitary ◽

Pituitary Glands ◽

Junctional Complexes

Follicular structures, in the rat pituitary, composed of cells joined by junctional complexes and possessing few organelles and few, if any, secretory granules, were first described by Farquhar in 1957. Cells of the same description have since been observed in several species including man. The importance of these cells, however, remains obscure. While studying human pituitary glands, we have observed wide variations in the fine structure of follicular cells which may lead to a better understanding of their morphogenesis and significance.

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