Slow aggregation and disaggregation of TiO2 nanocrystals in aqueous HCl solutions

2012 ◽  
Vol 63 (1) ◽  
pp. 162-167 ◽  
Author(s):  
O. B. Pavlova-Verevkina ◽  
L. A. Ozerina ◽  
A. Chemseddine ◽  
A. N. Ozerin
Keyword(s):  
Tio2 Nanocrystals ◽  
Slow Aggregation ◽  
Aggregation And Disaggregation

Effect of electrolytes on the slow aggregation of TiO2 nanocrystals

2009 ◽  
Vol 71 (4) ◽  
pp. 529-533 ◽  
Author(s):  
O. B. Pavlova-Verevkina ◽  
L. A. Ozerina ◽  
E. D. Politova ◽  
N. M. Surin ◽  
A. N. Ozerin
Keyword(s):  
Tio2 Nanocrystals ◽  
Slow Aggregation

A Monoclonal Antibody to the Human Platelet Glycoprotein II b/III a Complex Induces Platelet Activation

1988 ◽  
Vol 60 (01) ◽  
pp. 068-074 ◽  
Author(s):  
Piet W Modderman ◽  
Han G Huisman ◽  
Jan A van Mourik ◽  
Albert E G Kr von dem Borne
Keyword(s):  
Human Platelet ◽  
Adenosine Diphosphate ◽  
Dense Granule ◽  
Platelet Glycoprotein ◽  
Activated Platelets ◽  
Complex Functions ◽  
Slow Aggregation ◽  
Irreversible Aggregation ◽  
Platelet Release ◽  
Aggregation Of Platelets

SummaryThe platelet glycoprotein (GP) IIb/IIIa complex functions as the receptor for fibrinogen on activated platelets. The effects of two anti-GPIIb/IIIa monoclonal antibodies on platelet function were studied. These antibodies, 6C9 and C17, recognized different epitopes, which were exclusively present on the undissociated GPIIb/IIIa complex. Whereas C17 inhibited the binding of fibrinogen to platelets and platelet aggregation induced by adenosine diphosphate (ADP) or collagen, 6C9 caused irreversible aggregation of platelets, both in the presence and absence of extracellular fibrinogen. When incubated with unstirred (nonaggregating) platelets, 6C9 induced release of alpha and dense granule-constituents as well as binding of 125I-fibrinogen to platelets. The latter was evidently mediated in part by platelet-derived ADP, since it was inhibited to a large extent by apyrase, the ADP-hydrolyzing enzyme. F(ab’)2 fragments of 6C9 did not induce platelet-release reactions but caused (slow) aggregation of platelets in the presence of extracellular fibrinogen.These results indicate that binding of an antibody to a specific site on the platelet GPIIb/IIIa complex may cause fibrinogen-mediated aggregation. The Fc part of the platelet-bound antibody appears to be involved in the induction of platelet release.

Accumulation of Macromolecular Particles in the Reticuloendothelial System (RES) Mediated by Platelet Aggregation and Disaggregation

1969 ◽  
Vol 22 (03) ◽  
pp. 496-507 ◽  
Author(s):  
W.G van Aken ◽  
J Vreeken
Keyword(s):  
Platelet Aggregation ◽  
Degradation Products ◽  
Reticuloendothelial System ◽  
Caproic Acid ◽  
Carbon Particles ◽  
Carbon Clearance ◽  
Aggregation And Disaggregation ◽  
Platelet Aggregates

SummaryCarbon particles cause platelet aggregation in vitro and in vivo. Prior studies established that substances which modify thrombocyte aggregation also influence the rate at which carbon is cleared from the blood.This study was performed in order to elucidate the mechanism by which the carbon-platelet aggregates specifically accumulate in the RES.Activation of fibrinolysis by urokinase or streptokinase reduced the carbon clearance rate, probably due to generated fibrinogen degradation products (FDP). Isolated FDP decreased the carbon clearance and caused disaggregation of platelets and particles in vitro. Inhibition of fibrinolysis by epsilon-amino-caproic acid (EACA), initially accelerated the disappearance of carbon and caused particle accumulation outside the RES, predominantly in the lungs. It is supposed that platelet aggregation and locally activated fibrinolysis act together in the clearance of particles. In the normal situation the RES with its well known low fibrinolytic activity, becomes the receptor of the particles.

Platelet Aggregation in Diabetes Mellitus and the Effect of Insulin in Vivo on Aggregation

1972 ◽  
Vol 27 (01) ◽  
pp. 114-120 ◽  
Author(s):  
A. A Hassanein ◽  
Th. A El-Garf ◽  
Z El-Baz
Keyword(s):  
Platelet Aggregation ◽  
Rapid Onset ◽  
Control Group ◽  
Diabetic Patients ◽  
Fasting State ◽  
Clotting Time ◽  
Cholesterol Levels ◽  
Platelet Disaggregation ◽  
Aggregation And Disaggregation

SummaryADP-induced platelet aggregation and calcium-induced platelet aggregation tests were studied in 14 diabetic patients in the fasting state and half an hour after an intravenous injection of 0.1 unit insulin/kg body weight. Platelet disaggregation was significantly diminished as compared to a normal control group, and their results were negatively correlated with the corresponding serum cholesterol levels. Insulin caused significant diminution in the ADP-induced platelet aggregation as a result of rapid onset of aggregation and disaggregation. There was also a significant increase in platelet disaggregation. In the calcium-induced platelet aggregation test, there was a significant shortening of the aggregation time, its duration, and the clotting time. The optical density fall due to platelet aggregation showed a significant increase. Insulin may have a role in correcting platelet disaggregation possibly through improvement in the intracellular enzymatic activity.

Rhodium as efficient additive for boosting acetone sensing by TiO2 nanocrystals. Beyond the classical view of noble metal additives

2020 ◽  
Vol 319 ◽  
pp. 128338 ◽  
Author(s):  
Mauro Epifani ◽  
Saulius Kaciulis ◽  
Alessio Mezzi ◽  
Ting Zhang ◽  
Jordi Arbiol ◽  
...  
Keyword(s):  
Noble Metal ◽  
Tio2 Nanocrystals ◽  
Classical View ◽  
Metal Additives

Smart molecular butterfly: an ultra-sensitive and range-tunable ratiometric thermometer based on dihydrophenazines

2020 ◽  
Vol 7 (2) ◽  
pp. 615-623 ◽  
Author(s):  
Wenxuan Song ◽  
Wenqiang Ye ◽  
Lijiang Shi ◽  
Jinhai Huang ◽  
Zhiyun Zhang ◽  
...  
Keyword(s):  
Excited State ◽  
Aggregation And Disaggregation ◽  
State Configuration

Ultra-sensitive and range-tunable ratiometric thermometers were developed by controlling the excited-state configuration transformation of a dihydrophenazine derivative via aggregation and disaggregation.

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