Electrokinetic study of silica particles flocculated by two cationic polyelectrolytes; sequential and simultaneous addition

Forces between negatively charged micron-sized silica particles were measured in aqueous solutions of cationic polyelectrolytes with the atomic force microscope (AFM).

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Functionalization of silica particles towards cationic polyelectrolytes using vinylformamide and 1,3-divinylimidazolidin-2-one as monomers

Macromolecular Symposia ◽

10.1002/1521-3900(200101)163:1<87::aid-masy87>3.0.co;2-9 ◽

2001 ◽

Vol 163 (1) ◽

pp. 87-96 ◽

Cited By ~ 2

Author(s):

Torsten Meyer ◽

Petra Rehak ◽

Christian Jäger ◽

Ina Voigt ◽

Frank Simon ◽

...

Keyword(s):

Silica Particles ◽

Cationic Polyelectrolytes

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Quantification of Silica Uptake by Alveolar Macrophages - An Emperical Scanning Electron Microprobe Method

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100054297 ◽

1982 ◽

Vol 40 ◽

pp. 332-333

Author(s):

V. V. Damiano ◽

R. P. Daniele ◽

H. T. Tucker ◽

J. H. Dauber

Keyword(s):

Quantitative Analysis ◽

Alveolar Macrophages ◽

Bulk Sample ◽

Silica Particles ◽

Empirical Method ◽

Phagocytic Cells ◽

Calibration Standards ◽

X Ray ◽

Accurate Quantitative Analysis ◽

Scanning Electron

An important example of intracellular particles is encountered in silicosis where alveolar macrophages ingest inspired silica particles. The quantitation of the silica uptake by these cells may be a potentially useful method for monitoring silica exposure. Accurate quantitative analysis of ingested silica by phagocytic cells is difficult because the particles are frequently small, irregularly shaped and cannot be visualized within the cells. Semiquantitative methods which make use of particles of known size, shape and composition as calibration standards may be the most direct and simplest approach to undertake. The present paper describes an empirical method in which glass microspheres were used as a model to show how the ratio of the silicon Kα peak X-ray intensity from the microspheres to that of a bulk sample of the same composition correlated to the mass of the microsphere contained within the cell. Irregular shaped silica particles were also analyzed and a calibration curve was generated from these data.

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Fibrinogen and its Derivatives: Cofactors in the Intrinsic Generation of Thrombin

Thrombosis and Haemostasis ◽

10.1055/s-0038-1647923 ◽

1976 ◽

Vol 35 (02) ◽

pp. 305-313 ◽

Cited By ~ 1

Author(s):

D.C Triantaphyllopoulos ◽

L.T Ryan

Keyword(s):

Factor Viii ◽

Vitamin K ◽

Bovine Serum ◽

Thrombin Generation ◽

Factor V ◽

Simultaneous Addition ◽

Lower Effect

SummaryThe simultaneous addition of suboptimal concentrations of factor VIII and intact or plas-min-lysed fibrinogen into mixtures of the vitamin K dependent factors, phospholipids, adsorbed bovine serum (supplier of factor V) and calcium, increased the amount of thrombin which was generated three to twenty times over the sum of the amounts which were generated when factor VIII, or fibrinogen, or its derivatives were added separately into the thrombin generating mixture. When factor VIII was added together with both fibrinogen and its derivatives, the amount of thrombin generated was even greater, about 130% larger than the amount which was generated in the presence of equal concentrations of only intact fibrinogen plus factor VIII. Addition of albumin instead of fibrinogen or its derivatives has a similar but significantly lower effect on thrombin generation. It appears, therefore, that both intact fibrinogen and its plasminolytic derivatives, singly or in combination, and to a lesser extent albumin, act as cofactors in the reaction which is regulated by factor VIII.

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Resource-saving technology for production high-quality types of paper and cardboard using cationic polyelectrolytes

Polymer materials and technologies ◽

10.32864/polymmattech-2017-3-3-54-63 ◽

2017 ◽

Vol 3 (3) ◽

pp. 54-63

Author(s):

N.V. Chernaya ◽

N.V Zholnerovich ◽

I.V. Nikolaichik

Keyword(s):

Resource Saving ◽

High Quality ◽

Cationic Polyelectrolytes

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Interaction between parathyroid hormone and prostaglandin E1 on cyclic AMP metabolism in rat kidney

Acta Endocrinologica ◽

10.1530/acta.0.0930339 ◽

1980 ◽

Vol 93 (3) ◽

pp. 339-345 ◽

Cited By ~ 2

Author(s):

Naokazu Nagata ◽

Yuriko Ono ◽

Narimichi Kimura

Keyword(s):

Parathyroid Hormone ◽

Cyclic Amp ◽

Adenylate Cyclase ◽

Rat Kidney ◽

Prostaglandin E ◽

Cortical Tissue ◽

Newborn Rat ◽

Simultaneous Addition ◽

Renal Cortical Tissue ◽

Subsequent Addition

Abstract. The interaction between parathyroid hormone (PTH) and prostaglandin E1 (PGE1) in influencing cyclic AMP metabolism in rat renal cortical tissue was examined. PTH and PGE1 stimulated additively the adenylate cyclase activity in the homogenate of the tissue. Both PTH and PGE1 enhanced the level of cyclic AMP in the incubated renal cortical tissue, but the effect of their simultaneous addition did not exceed the effect induced by PTH alone. Cyclic AMP accumulated in the incubation medium by stimulation by PTH was decreased by the simultaneous addition of PGE1. When the tissue was pre-incubated for 30 min with 2 to 10 μg/ml of PGE1, the magnitude of the increase of cyclic AMP caused by PTH subsequently added was lessened. However, the response to PTH of adenylate cyclase preparation obtained from the homogenate of PGE1-pre-treated tissue was not decreased. When first PTH was added to the incubating renal cortical tissue, the subsequent addition of PGE1 accelerated the decrease of cyclic AMP content in the tissue and decreased the amount of cyclic AMP released from the tissue. The interaction of PTH and PGE1 on cyclic AMP metabolism in the renal cortical tissue was in contrast to that seen in newborn rat calvaria where PGE1 and PTH acted additively in enhancing the level of cyclic AMP.

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