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The effect of reaction parameters on lipase-mediated chemo-enzymatic epoxidation of linoleic acid was investigated. Hydrogen peroxide was found to have the most significant effect on the reaction rate and degree of epoxidation. Excess of hydrogen peroxide with respect to the amount of double bonds was necessary in order to yield total conversion within a short time period, as well as at temperatur
An economic process for the enzymatic hydrolysis of cellulose would allow utilization of cellulosic biomass for the production of easily fermentable low-cost sugars. New and more efficient fermentation processes are emerging to convert this biologic currency to a variety of commodity products with a special emphasis on fuel ethanol production. Since the cost of cellulase production currently accou
The structural stability of guanine quadruplexes depends critically on an unusual configuration of dehydrated Na+ or K+ ions, closely spaced along the central axis of the quadruplex. Crystallography and NMR spectroscopy indicate that these internal ions can be located between the G-quartet planes as well as in the thymine loops, but the precise ion coordination has been firmly established in only
The aim of the present study was to investigate the effect of a mandibular advancement device (MAD) for the treatment of sleep apnea (SA) on plasma brain natriuretic peptide (BNP), left ventricular ejection fraction (LVEF), and health-related qualify of life (HRQL) in patients with mild to moderate stable congestive heart failure (CHF). Seventeen male patients aged 68.4 +/- 5.5 with an apnea-hypop
The copolymer of 3-(acrylamido)phenyl boronic acid and N-isopropylacrylamide (82:18. M-n = 47000 g/mol) was prepared by free radical polymerization. The copolymer showed typical thermoprecipitation behavior in aqueous solutions; its phase transition temperature (T-p) was 26.5 +/- 0.2 degrees C in 0.1 M glycine-NaOH buffer containing 0.1 M NaCl, pH 9.2. Due to specific complex formation of the pend
Geographical information systems (GIS) aim to help decision-makers to relate different types of data in a spatial context and to reach conclusions about these relationships. This research examines the potential areas that a GIS could be applied within multinational finance corporations. The results highlight the importance of combining the financial aspects of the multinational with its operationa
Macroporous materials are prepared from microgels or microbes by one-step chemical cross-linking under semifrozen conditions. This avoids the use of freeze drying of the sample because a chemically stable structure is prepared under semifrozen conditions. Cryostructuration results in a material with pore walls composed of closely packed particles.
BACKGROUND: S100beta has been suggested as a marker of brain damage after cardiac operation. The aim of this study was to characterize the early S100beta release in detail and relate it to neuropsychological outcome. METHODS: Three groups of patients were investigated. All patients underwent coronary artery bypass surgery (CABG) with extracorporeal circulation. In group A, 110 patients had samplin
The lipid and fatty acid compositions of Glomus intraradices and G. claroideum mycelia, extracted from quartz sand in a compartmentalized growth system, were analysed. The fungi were grown in association with Cucumis sativus and Trifolium subterraneum, respectively. For both fungi, the fatty acids 16:1 omega 5 and 16:0 dominated in the neutral lipid fraction, and 18:1 omega 7 made up a significant
Reverse transcription of hepatitis B virus (HBV) pregenomic RNA is essential for virus replication. In the first step of this process, HBV reverse transcriptase binds to the highly conserved encapsidation signal, epsilon (epsilon), situated near the 5' end of the pregenome. epsilon has been predicted to form a bulged stem-loop with the apical stem capped by a hexa- loop. After the initial binding
Calculations of the significance of results from linkage analysis can be performed by simulation or by theoretical approximation, with or without the assumption of perfect marker information. Here we concentrate on theoretical approximation. Our starting point is the asymptotic approximation formula presented by Lander and Kruglyak (1995, Nature Genetics, 11, 241-247), incorporating the effect of
Death of transplanted dopaminergic neurons is induced both during preparation of donor tissue and after intrastriatal grafting. Oxidative stress is thought to be partly responsible for this cell death. In the present study we compared the effects of three lipid peroxidation inhibitors, the lazaroids Tirilazad mesylate, U-83836E and U-101033, on survival of embryonic mesencephalic neurons in differ
Background: Inotropic and myocardial anti-ischemic effects have been demonstrated with levosimendan. The comparison of levosimendan started before an ischemia-reperfusion event as compared with levosimendan started during ischemia has not been studied. Methods: In anesthetized pigs, a major branch of the circumflex artery was completely occluded for 30 min and then reperfused. The metabolism in th
Eosinophils participate in allergic inflammation and may have roles in the bodys defense against helminthic infestation. Even under noninflammatory conditions, eosinophils are present in the mucosa of the large intestine, where large numbers of gram-negative bacteria reside. Therefore, roles for eosinophils in host defenses against bacterial invasion are possible. In a system for bacterial viable
Residual dipolar couplings (RDCs) have proven to be a valuable NMR tool that can provide long-range constraints for molecular structure determination. The constraints are orientational in nature and are, thus, highly complementary to conventional distance constraints from NOE data. This complementarity would seem to extend to the study of the geometry of ligands bound to proteins. However, unlike
Rabbit, horse, rat, and chicken immunoglobulin G (IgG); rabbit, horse, and goat IgG Fc fragments; rabbit and chicken F(ab')2 fragments, and rat and chicken gamma globulins, in concentrations of 5 and 10 mg/ml, were able to reduce virus production 10- to 10,000-fold when incubated with herpes simplex virus type 1 (HSV-1)-infected GMK AH1 cells. When the ability of the purified IgGs and gamma globul
Photoreceptor cells of vertebrate eyes are fundamentally different from those of invertebrate eyes. New work on the brain of a ragworm now suggests that ancestral bilaterians possessed both types of photoreceptor cell.
