Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0432222 (SEM)
 47,337 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The maintenance of the mechanical properties of the vessels results from the correct arrangement of smooth muscle cells and extracellular fibrous proteins (elastin and collagen) in their wall. The morphology of extracellular matrix modifications, particularly of elastin, was investigated in inflammatory (IA) and non specific (NSA) abdominal aortic aneurysms by scanning (SEM), transmission (TEM) and immunoelectron microscopy. Both NSAs and IAs were significantly characterized by extensive extracellular matrix remodelling, including different patterns of elastin degradation. Elastic and collagen fibres distribution appeared to be extensively altered in IAs, while it conformed more to a normal pattern in NSAs. With respect to NSAs, the morphology of elastic fibres in IAs was modified to such an extent that their identification by TEM had a rely on immunocytochemical methods and by SEM on back-scattered electron analysis. The observed ultrastructural changes are indicative of the central role of extracellular matrix modifications in the pathogenesis of IAs and NSAs.
 ...
PMID:The morphology of elastin in non-specific and inflammatory abdominal aortic aneurysms. A comparative transmission, scanning and immunoelectronmicroscopy study. 769 23

The present research was aimed at the study of adsorption properties of lead ion on natural sand particle (NSP) by FAAS and at the development of NSP as an adsorbent used in the removal and preconcentration of lead(II) ion in aqueous solution by adsorption. Particle structure and size distribution, surface morphology, specific surface area, functional radical of NSP and adsorption properties of lead ion onto NSP and factors which affect the adsorption capacity were analyzed using FTIR, SEM, NSA and FAAS. The adsorption condition such as acidity of solution, flow rate and time etc were optimized. The 5.0 cm x 5 mm i. d. separation column was prepared by filling with the NSP as adsorbent. The experimental results showed that under the optimal adsorption conditions, such as the procedure was carried out at room temperature, pH of solution was 6, the flow rate was 2. 55 mL x min(-1), the maximum adsorption of Pb(II) onto NSP as adsorbent was 24. 9 mg x g(-1). Adsorption rate was 91.5%. Specific surface area and pore size were 7.60 m2 x g(-1) and 3.91 nm respectively. Using 0.10 mol x L(-1) chloride acid for desorption of Pb(II), the desorption rate reached 99%. At the same time the adsorption mechanism of Pb(II) was studied.
 ...
PMID:[Analysis of the adsorption properties of lead ion onto natural sand particles by flame atomic absorption spectrometry]. 2224 32