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A nonelutable low-molecular weight heparin stent coating for improved thromboresistance.

Low-molecular weight heparin (LMWH) has been widely used as a systemic anticoagulant during percutaneous coronary intervention. In this study, LMWH was covalently immobilized to the surface of a cobalt chromium reservoir-based sirolimus-eluting stent to create a nonelutable nanoscale coating for enhanced thromboresistance. Toludine-blue stained stents revealed uniform heparin coverage on all surfaces of the stent. Scanning electron microscopy of stent strut cross-sections showed identical coating thickness on all sides; while the thickness was determined to be 320 nm by a focus-ion beam system. Secondary ion mass spectrometry showed constant concentrations of O, N, and S atoms throughout the depth of the surface, confirming the uniformity of the heparin coating. The nonelutable nature of the coating was confirmed in a modified Factor Xa inhibition assay which showed the stent had an equivalent of 3-5 heparin units/cm(2), while no elutable heparin was detected in wash solutions. The antithrombin binding capacity of the immobilized heparin was determined to be 60-80 pmol/cm(2) in an antithrombin uptake assay. The enhanced thromboresistance of the heparin coating was demonstrated in an in-vitro bovine blood flow loop which showed minimal visual thrombus accumulation and 95% reduction in platelet deposition compared to uncoated control stents. Drug-eluting stents with such nonelutable LMWH coating would represent a significant advance in the treatment of patients with complex lesions who are at increased risk of developing stent thrombosis.

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A nonradioactive method for detecting phosphates and polyphosphates separated by PAGE.

Nonradioactive polyphosphate (poly(P); (PO(3) (-))(n)) species resolved by PAGE can be detected by hydrolytic degradation of the polyphosphates into orthophosphates (P(i)) with a 5 M HCl solution saturated with NaCl, followed by staining the P(i) degradation products in a 1 M HCl solution of 0.25% w/v methyl green and 1% w/v ammonium molybdate. This method detects down to 0.5 nmol of phosphate as P(i), linear poly(P) (condensed phosphate), pyrophosphate (P(2)O(7) (4) (-)), or cyclic trimetaphosphate ion (P(3)O(9))(3) (-) species. This method improves the current method of staining linear poly(P) longer than four phosphate units with Toludine blue-O after PAGE. This study also shows that Stains-All can visualize resolved linear poly(P) shorter than those visualized by Toluidine blue-O. It is hoped that this sequential hydrolytic degradation and phosphate visualization method for detecting ortho-, linear, and cyclic poly(P) species will be a useful tool, as poly(P) are being discovered in a wide variety of biological systems, and their biochemical roles are still largely unknown.

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QuantiChrom™ Formaldehy MOUSE ANTI BOVINE ROTAVIR Bone Morphogenetic Protei Growth Differentiation Fa Amplite™ Fluorimetric F Androgen Receptor (Phosph Androgen Receptor (Phosph Rabbit Anti-Human Androge Rabbit Anti-Human Androge MOUSE ANTI BORRELIA BURGD Androgen Receptor (Ab 650 succinate-CoA ligase, GDP

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Mast cells in histoid lepromatous lesions.

Ten patients with histoid lesions among the lepromatous leprosy cases, of both sexes in the age group of 35-65 years, were included in this study. Skin biopsy from the nodule with surrounding healthy skin of histoid lesion was taken. The biopsies were fixed in susa solution and processed for light microscopy. 5-7 mu thick sections were cut and stained with haematoxylin and eosin, Toludine blue and Fite faraco. Observations were made on the dermis to locate the mast cells and bacilli. Proliferation of mast cells and their degranulation was seen in the histoid nodule as compared to surrounding normal healthy skin where the cells were mainly intact. The study further investigates the role of mast cells in the histopathogenesis of the disease.

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