References: Lecithin
Cornea. 1989;8(2):135-40.
Corneal changes in the dislipoproteinaemias.
Bron AJ.
Nuffield Laboratory of Ophthalmology, University of Oxford, England.
The corneal changes in the hyper- and hypoproteinaemias may affect vision and/or provide a diagnostic clue to a systemic disorder. This article describes the structure and function of the major lipoprotein classes and the means by which dietary lipid is absorbed and by which exogenous and endogenous lipid is distributed to and cleared from the tissues. In hyper-beta-lipoproteinaemia, lipid arcus formation may be related to the duration and height of the raised cholesterol levels. The peripheral location of the lipid deposit is presumed to be related to peripheral trapping of low-density lipoprotein (LDL) by glycosaminoglycan binding and tight stromal packing with maintained central clearing by high-density lipoprotein (HDL), whose smaller molecular diameter should allow freer stromal diffusion. In the hypolipoproteinaemias, e.g., Tangier disease, generalised (alpha and beta) lecithin cholesterol acyltransferase (LCAT) deficiency, and alpha-LCAT deficiency (fish-eye disease), the absence or abnormality of HDL may impair clearance of endogenous and possibly exogenous stromal lipid. The hyperlipoproteinaemia that sometimes accompanies Schnyder's crystalline corneal dystrophy is thought to modify the effects of a primary failure of corneal stromal lipid metabolism.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2714095&dopt=Abstract lecithin
nihs.go.jp
It is important to evaluate the prevention of nosocomial infections caused by airborne micro-organisms in healthcare facilities. For that purpose, the use of an air sampler is required. A comparison of the collecting efficiency of air samplers has not been studied so far using a single culture medium. Use of the same culture medium is necessary because of the variation of the cultivation efficiency with different culture media. In this study a statistically significant difference in collecting efficiency among air samplers was observed in case of SCDA (soybean casein digest agar) culture medium, but not SCDALP (soybean casein digest agar lecithin polysorbate) culture medium. In addition, a statistically significant difference of the cultivation efficiency was observed between SCDA and SCDALP culture media (P<0.05). These results suggest that any air sampler can be used with SCDALP culture medium.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14706270&dopt=Abstract lecithin
Biokhimiia. 1989 Jan;54(1):118-23.
[Protective effect of high density lipoproteins, their subfractions and lecithin-cholesterol-acyltransferases on the peroxidation modification of low density lipoproteins]
[Article in Russian]
Klimov AN, Nikiforova AA, Pleskov VM, Kuz'min AA, Kalashnikova NN.
The role of high density lipoproteins (HDL), their subfractions (HDL2 and HDL3) and lecithin: cholesterol acyltransferase (LCAT) on peroxidative modification of low density lipoproteins (LDL) in vitro was studied. Peroxidative modification was estimated by the formation of malonic dialdehyde (MDA) and LDL aggregates during LDL incubation at 37 degrees C for several days without Fe2+ or for 2 hours in the presence of Fe2+ in EDTA-free media. It was shown that the addition of HDL3 (but not HDL2) markedly decreases the formation of both MDA and LDL aggregates. Since LCAT is bound to HDL3, its effect was examined. An addition of LCAT isolated from human plasma (650-fold purification) at a concentration of 450 micrograms/ml resulted in a complete inhibition of LDL peroxidation and LDL aggregate formation. Heat-inactivated LCAT had no effect. Possible mechanisms of the protective effect of LCAT on LDL peroxidative modification are discussed.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2719985&dopt=Abstract lecithin
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