Methionine has an almost unique stimulatory effect on biosynthesis of cephalosporins (by Cephalosporium acremonium). No other sulfur-containing compound tested, except dl-methionine-dl-sulfoxide, replaced methionine. dl-Methionine stimulated the synthesis of cephalosporins when added after the growth phase. The utilization of inorganic sulfate was repressed by methionine. Experiments with l-met...

In immature rib segments prepared from morning-glory (Ipomoea tricolor) flower buds, the major soluble metabolite formed from tracer amounts of l-methionine-U-(14)C was S-methylmethionine (SMM). In segments of senescing ribs, (14)C was progressively lost from SMM and appeared in free methionine. Immature segments contained about 4 nmoles of free methionine and about 16 nmoles of SMM per 30 segm...

OBJECTIVE Paraoxonase (PON) exhibits esterase activity (PON-AREase) and lactonase activity (PON-HCTLase), which prevent LDL oxidation and detoxify homocysteine thiolactone (HCTL). The role of HCTL and PON-HCTLase as a risk factor for the microvascular complication in diabetic retinopathy at the level of vitreous has not been investigated. RESEARCH DESIGN AND METHODS Undiluted vitreous from pa...

Cigarette smoking is associated with adverse effects on lipid profile and homocysteine thus increasing risk for atherosclerosis and coronary heart disease. Smoking is a prominent risk factor for coronary artery disease, atherosclerosis and peripheral vascular disorders. This study was undertaken to evaluate serum lipid profile in chronic smokers and to compare it with healthy non-smokers, consi...

Cigarette Smoking is associated with adverse effects on lipid profile and Homocysteine thus increasing risk for atherosclerosis and coronary heart disease. Smoking is a prominent risk factor for coronary artery disease, atherosclerosis and peripheral vascular disorders. This study was undertaken to evaluate serum lipid profile in chronic smokers and to compare it with healthy non-smokers, consi...

Acromegaly is associated with a two to three-fold increase in mortality related predominantly to cardiovascular disease. The excess mortality is associated most closely with higher levels of growth hormone (GH). Survival in acromegaly may be normalized to a control age-matched rate by controlling GH levels; in particular, GH levels less than 2.5 ng/mL are associated with survival rates equal to...

The ability of S-adenosyl-L-homocysteine (AdoHcy) to inhibit biologic transmethylation reactions in vitro has led us to explore the possibility of pharmacologically manipulating AdoHcy levels in vivo and examining the consequences of these alterations on the transmethylation of some biogenic amines. Swiss-Webster mice were injected intraperitoneally with different doses of adenosine (Ado) and D...

There are two, at least, methyl transfer reactions promoted by liver slices in vitro (2). The fundamental distinction between them is that one is dependent on oxygen and the other is not. Transmethylation reactions found to be independent of oxygen are methionine formation by the methylation of homocysteine, homocystine, or homocysteine thiolactone by either choline or betaine. They are not inh...

Bacterial adhesion is a crucial step in colonization of the skin. In this study, we investigated the differential adherence to human and pig corneocytes of six Staphylococcus aureus strains belonging to three human-associated [ST8 (CC8), ST22 (CC22) and ST36(CC30)] and two pig-associated [ST398 (CC398) and ST433(CC30)] clonal lineages, and their colonization potential in the pig host was assess...

Methicillin-resistant Staphylococcus aureus (MRSA) emerged in 1961 and became dramatically more prevalent as agents of bacteraemia in the UK in the mid-1990s in England, Wales and Northern Ireland. By the end of the 1990s, .40% of all S. aureus bacteraemias were due to MRSA, though this proportion (and the total number) of MRSA bacteraemias has since declined and stood at 20% in 2008. The rise ...