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Results 401 - 450 of 1201
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Kasai T - - 2003
BACKGROUND: Intravenous amino acid infusion during general anaesthesia prevents decreases in core temperature resulting from increased energy expenditure and heat accumulation. METHODS: We investigated whether such stimulation also occurs during spinal anaesthesia, which blocks sympathetic nervous activity. We examined the effect of i.v. amino acid infusion on changes in core ...
Bartzatt Ronald - - 2003
Barbituric acid is the parent compound of a large family of hypnotic barbiturates. A nitrogen mustard (N-mustard) group (-CH2CH2N[CH2CH2Cl]2) was placed onto the two nitrogen atoms at positions 1 and 3 of the pyrimidine ring. This N-mustard agent is a solid at 25 degrees C, stable at -10 degrees C ...
Luttinger Daniel - - 2003
A study to try to better understand the interactions between various air contaminants and acute asthma exacerbations is described. The study evaluates temporal associations between a panel of air contaminants and acute asthmatic exacerbations as measured by emergency room visits for asthma in communities in the Bronx and Manhattan in ...
Griswold K E - - 2003
The effects of urea and rumen-degradable protein (RDP) on microbial growth, digestibility, and fermentation were examined using dual-flow continuous culture. The experimental design was a 4 x 4 Latin square with a 2 x 2 factorial arrangement of treatments. Factors were urea infusion (0.4 g/L of artificial saliva) and RDP ...
Lee P C - - 2003
Anaerobiospirillum succiniciproducens grew on a minimal salts medium containing wood hydrolysate (equivalent to 27 g glucose l(-1)) and, when supplemented with 10 g corn steep liquor l(-1) as a complex nitrogen source, succinic acid at 24 g l(-1) was obtained (yield = 88% w/w glucose). This may therefore be an ...
Driscoll Charles T - - 2003
Acidic deposition is comprised of sulfuric and nitric acids and ammonium derived from atmospheric emissions of sulfur dioxide, nitrogen oxides, and ammonia, respectively. Acidic deposition has altered soil through depletion of labile pools of nutrient cations (i.e. calcium, magnesium), accumulation of sulfur and nitrogen, and the mobilization of elevated concentrations ...
Pundir C S - - 2003
Uric acid in urine was analyzed using porcine liver uricase and horseradish peroxidase immobilized on alkylamine and arylamine glass beads (pore diameter 55nm) respectively. The minimum detection limit was 5.0mg/0.1 ml urine. The recovery of added uric acid was 92%. Within and between assay CVS were <1.3% and <5.3% respectively. ...
Ishida Shiho - - 2002
The amide nitrogen atom of glutamine is incorporated into pyridoxine in four eukaryotes (i.e., Emericella nidulans, Mucor racemosus, Neurospora crassa and Saccharomyces cerevisiae) and two prokaryotes (i.e., Staphylococcus aureus and Bacillus subtilis). However, in the prokaryotes Pseudomonas putida, Enterobacter aerogenes and Escherichia coli, it is the nitrogen atom of glutamate ...
Hartung W - - 2002
Glycine and serine are potential sources of nitrogen for the aquatic resurrection plant Chamaegigas intrepidus Dinter in the rock pools that provide its natural habitat. The pathways by which these amino acids might be utilized were investigated by incubating C. intrepidus roots and maize (Zea mays) root tips with [(15)N]glycine, ...
Dong Shufu - - 2002
We studied the absorption, assimilation, translocation and distribution of nitrogen (N) from urea applied in autumn to leaves of 1-year-old potted Fuji/M26 apple (Malus domestica Borkh) trees. In early October, all leaves of each tree were painted with either 3% urea (enriched to 10 atom % with 15N) or water ...
Widman Jan - - 2002
The thermic effect of amino acids is augmented under general anesthesia and counteracts hypothermia. Mild hypothermia may increase surgical bleeding. We studied whether amino acids also induce thermogenesis under spinal anesthesia and whether this endogenous heat production reduces bleeding during hip arthroplasty. Rectal temperature, oxygen uptake, and perioperative bleeding were ...
Chen Esther J - - 2002
The delivery to the plasma membrane of the general amino acid permease, Gap1p, of Saccharomyces cerevisiae is regulated by the quality of the nitrogen source in the growth medium. In an effort to define how different nitrogen sources control Gap1p sorting, we find that mutations in GDH1 and GLN1 that ...
Mó Otilia - - 2002
The gas-phase acidities of methylidynephosphine, HCtbond;P, ethylidynephosphine, CH(3)Ctbond;P, and ethylidynearsine, CH(3)Ctbond;As, have been measured by means of Fourier Transform Ion Cyclotron Resonance (FTICR) mass spectrometry and calculated at the CCSD(T)/6-311+G(3df,2p)//QCISD/ 6-311+G(df,p) level of theory. An analysis of these results shows that, in contrast to the well-known fact that HCtbond;N is ...
Werner Roland A - - 2002
The bulk delta 15 N-value of plant (leaf) biomass is determined by that of the inorganic primary nitrogen sources NO(3)(-), NH(4)(+) and N(2), and by isotope discriminations on their uptake or assimilation. NH(4)(+) from these is transferred into "organic N" mainly by the glutamine synthetase reaction. The involved kinetic nitrogen ...
Szajdak Lech - - 2002
The changes of the total nitrogen, average yearly concentration of ammonia, nitrate ions, urease activity, total amount of amino acids in humic acids (HA) and the structure of humic acids were monitored in relation to the effect of shelterbelt as biogeochemical barrier located on a mineral and mineral-organic soil. The ...
Mattila Pirjo - - 2002
The basic composition (moisture, total carbohydrates, dietary fiber, crude fat, ash, nitrogen, and protein) and amino acid contents were determined in the cultivated mushrooms Agaricus bisporus/white, Agaricus bisporus/brown, Lentinula edodes, and Pleurotus ostreatus. In addition, nitrogen-to-protein conversion factors were calculated for each species by dividing the sums of amino acid ...
Wipf Daniel - - 2002
Besides a role in phosphate supply, ectomycorrhizas play a crucial role in nitrogen nutrition of plants. The ectomycorrhizal association between Hebeloma cylindrosporum and Pinus pinaster serves as a model system accessible to molecular manipulation. Hebeloma mycelium is able to take up and use amino acids as the sole nitrogen source. ...
Guo Jiantao - - 2002
The biosynthetic source of the nitrogen atom incorporated into the aminoshikimate pathway has remained a question for some time. 3-Amino-3-deoxy-D-fructose 6-phosphate has previously been demonstrated to be a precursor to 4-amino-3,4-dideoxy-D-arabino-heptulosonic acid 7-phosphate and 3-amino-5-hydroxybenzoic acid via the inferred intermediacy of 1-deoxy-1-imino-D-erythrose 4-phosphate in Amycolatopsis mediterranei cell-free extract. This investigation ...
Hellstern Gerald - - 2002
OBJECTIVES: Early administration of parenteral amino acids increases whole body nitrogen retention in premature infants. Tracer kinetic studies suggest an increase in whole body protein synthesis as a possible mechanism for this increase in nitrogen retention. However, the effect of early parenteral amino acids on synthesis of specific proteins remains ...
Rutherfurd S M - - 2002
1. The study aimed to assess the effect of a commercially available microbial phytase on phytate phosphorus and total phosphorus content at the terminal ileum as well as true ileal amino acid digestibility. 2. Five diets, each containing a different plant-based feedstuff, were supplemented with microbial phytase and fed, along ...
Perrot L - - 2002
As important as the blend of base wines before bottling, one of the most important steps in the champagne-making process is the long ageing on lees. Two yeast strains of Saccharomyces cerevisiae MC001 and MC002, used in champagne wine production, were allowed to autolyse. After 8 days of autolysis, active ...
Anastassiadis S - - 2002
A suitable strain and important factors influencing citric acid formation in yeasts were identified. Candida oleophila ATCC 20177 was chosen as the best citric acid producer from several Candida strains. Yields of 50 g/l citric acid were produced in shake flask and 80 g/l in fed-batch fermentations with 1.5 and ...
Khoder M I - - 2002
Indoor and outdoor measurements of nitrous acid and nitrogen dioxide were conducted at four homes and two offices in residential areas in Greater Cairo during winter (2000-2001) and summer (2001) seasons. Indoor nitrogen dioxide concentrations were higher than outdoor levels at the four homes, whereas indoor concentrations of nitrogen dioxide ...
Matt Petra - - 2002
Tobacco transformants that express an antisense RBCS construct were used to investigate the consequences of a lesion in photosynthetic carbon metabolism for nitrogen metabolism and secondary metabolism. The results show that an inhibition of photosynthesis and decrease in sugar levels leads to a general inhibition of nitrogen metabolism, and dramatic ...
Ramage Carl M - - 2002
The role of nitrate, ammonium, and culture medium pH on shoot organogenesis in Nicotiana tabacum zz100 leaf discs was examined. The nitrogen composition of a basal liquid shoot induction medium (SIM) containing 39.4 mM and 20.6 mM was altered whilst maintaining the overall ionic balance with Na(+) and Cl(-) ions. ...
Murai T - - 2002
The genus Malassezia has been revised to include six lipophilic species and one nonlipophilic species. These Malassezia species have been investigated to differentiate their morphological and physiological characteristics. However, assimilation of amino acids as a nitrogen source by these species was not well elucidated. In the present study, isolates of ...
Chrenková Mária - - 2002
The aim of this study was to determine the composition and nutritional value of conventional and transgenic, so-called Roundup Ready (RR) maize with an introduced gene of glyphosate resistance. Crude protein, crude fibre, ash, fat, starch, sugar, amino acids, fatty acid and macroelement levels were determined by chemical analysis. In ...
Sales-Duval Muriel - - 2002
We studied in details the ammonia or free amino acids (AA) effects on proteolytic activity of three ruminal bacteria: enzymatic activities and protein breakdown products were measured at the end of the exponential growth phase. In Streptococcus bovis the simultaneous uptake of ammonia and probably small peptides induced a decline ...
Price Nathan D - - 2002
The capabilities of genome-scale metabolic networks can be described through the determination of a set of systemically independent and unique flux maps called extreme pathways. The first study of genome-scale extreme pathways for the simultaneous formation of all nonessential amino acids or ribonucleotides in Helicobacter pylori is presented. Three key ...
Fournier V - - 2002
Besides being an indispensable amino acid for protein synthesis, arginine (Arg) is also involved in a number of other physiological functions. Available data on the quantitative requirement for Arg in different teleosts appear to show much variability. So far, there are very limited data on the maintenance requirements of indispensable ...
O'Brien Diane M - - 2002
The allocation of nutritional resources to reproduction in animals is a complex process of great evolutionary significance. We use compound-specific stable isotope analysis of carbon (GC/combustion/isotope ratio MS) to investigate the dietary sources of egg amino acids in a nectar-feeding hawkmoth. Previous work suggests that the nutrients used in egg ...
Bellomo R - - 2002
AIMS: To study the effect of combined continuous veno-venous hemodiafiltration (CVVHDF) and high (2.5 g/kg/day) parenteral amino acid supplementation on nitrogen balance, amino acid losses and azotemic control in a cohort of patients with severe acute renal failure (ARF). METHODS: We administered 2.5 grams/kg/day of amino acids intravenously to seven ...
Stitt Mark - - 2002
This article discusses how nitrate assimilation is integrated with nitrate uptake, with ammonium assimilation and amino acid synthesis, with pH regulation, and with the sugar supply in tobacco leaves. During the first part of the light period, nitrate assimilation exceeds nitrate uptake by 2-fold and ammonium assimilation by 50%, leading ...
Bérard Marie-Pierre - - 2002
We investigated whether a qualitative manipulation of amino acid mixture could improve the nutritional status of patients undergoing surgery. Patients received total parenteral nutrition for 2 consecutive 5-day periods. Energy and nitrogen supplies were calculated using a modified Harris-Benedict equation, with an energy-to-nitrogen ratio of 125 kcal/g nitrogen (N). The ...
Kuzma Marek - - 2002
The product ion mass spectra (collisionally induced dissociation mass spectra) of 12 different cyclosporins modified at every N-methylated amino acid residue with respect to cyclosporin A were compared and the effect of N-demethylation on ring opening mechanisms was evaluated. The four preferential protonation sites were identified in [MeBmt(1)]-cyclosporins. Three sites ...
Terjesen B F - - 2002
Considering that amino acids constitute an important energy fuel during early life of the Atlantic halibut (Hippoglossus hippoglossus L.), it is of interest to understand how the nitrogenous end products are handled. In this study we focused on the kinetics and fates of ammonia, urea and uric acid. The results ...
Katagiri Masayuki - - 2002
It has traditionally been thought that animals can utilize ammonia for amino acid biosynthesis, and that for them some amino acids are nutritionally nonessential. Presumably this idea originates from the notions of Schoenheimer (G. L. Foster et al. [1939] J. Biol. Chem. 127, 319-327) and of Rose (W. C. Rose ...
Porcelli Jr Peter J - - 2002
BACKGROUND: Early administration of parenteral amino acids to infants with extremely low birth weight (birth weight < or = 1,000 g) has been encouraged to foster growth. However, excessive intravenous intake of amino acids may cause metabolic acidosis and uremia in extremely low birth weight infants. The hypothesis for this ...
Fink Mitchell P - - 2002
Reactive oxygen species are reactive, partially reduced derivatives of molecular oxygen (O 2 ). Important reactive oxygen species in biologic systems include superoxide radical anion, hydrogen peroxide, and hydroxyl radical. Closely related species include the hypohalous acids, particularly hypochlorous acid; chloramine and substituted chloramines; and singlet oxygen. Reactive nitrogen species ...
Hata Shinsuke - - 2002
PURPOSE: We studied the effects of an amino acid mixture used for total parenteral nutrition (TPN) in pediatrics, on the liver function test results (LFTs) of neonates. METHODS: Thirty neonatal surgical patients were randomly divided into three groups according to the dose of amino acids given: group H ( n ...
Torrea-Goñi Diego - - 2002
This paper examines the evolution of nitrogen compounds during alcoholic fermentation in chardonnay musts inoculated with killer strains of Saccharomyces cerevisiae (ICV D47 and ICV K1M). The results are compared with those obtained from chardonnay must fermented with indigenous yeasts (control sample). The total quantity of nitrogen assimilated, as well ...
Ruiz-Capillas C - - 2002
Whole ungutted pota and octopus were stored in bulk in stainless steel refrigerated containers under controlled atmospheres. In order to evaluate the effectiveness of this treatment, physicochemical tests (pH, trimethylamine nitrogen, total volatile basic nitrogen, 2-thiobarbituric acid) and sensory assessments (inspection) were done. For both pota and octopus, the control ...
Guerra N P - - 2002
AIMS: Optimization of bacteriocin production by L. lactis subsp. lactis CECT 539 and Ped. acidilactici NRRL B-5627 on mussel-processing wastes. METHODS AND RESULTS: The concentrations of glucose and five nitrogen sources that optimize nisin and pediocin production were determined using a second order orthogonal factorial design. NH4Cl, glycine and glutamic ...
Hafner Christoph - - 2002
Trichloroacetic acid (TCA) can be found in various environmental compartments like air, rain and plants all over the world. It is assumed that TCA is an atmospheric degradation product of volatile chloroorganic hydrocarbons. The herbicide effect of TCA in higher concentrations is well known, but not much is known about ...
Bush Jill A - - 2002
Somatotropin (ST) treatment promotes animal growth and allows for the conservation of amino acids by increasing nitrogen retention and reducing ureagenesis and amino acid oxidation. To determine whether the improvement in amino acid conservation with ST treatment involves regulation of urea cycle enzyme activities in both liver and intestine, growing ...
Kupsinskiene E - - 2001
The aim of the research was to evaluate the content of amino acids in the needles of Pinus sylvestris growing in the area affected by a nitrogen fertilizer factory and to compare them with other parameters of needles, trees, and sites. Three young-age stands of Scots pine were selected at ...
Kolstad O - - 2001
BACKGROUND & AIMS: Both recombinant human growth hormone (rhGH) and glutamine (GLN) may have beneficial anabolic actions on amino acid metabolism. The aim of this study was to evaluate the additive effects of rhGH and GLN on plasma amino acids postoperatively. METHODS: 31 females undergoing laparoscopic cholecystectomy were randomized to ...
Ohlund J - - 2001
Effects of organic and inorganic nitrogen sources on growth and mineral nutrient concentrations of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) seedlings were compared in a 100-day experiment in a greenhouse. Seedlings were grown in pots containing peat. Nutrient solutions differing in ammonium, nitrate, arginine ...
Singer M A - - 2001
In mammals, varying in size from mouse to elephant there is a close linkage between metabolic rate (MR) and glomerular filtration rate (GFR). This linkage has evolved because of the necessity to excrete nitrogenous wastes generated predominately by amino acid catabolism. A similar linkage is observed in birds, reptiles and ...
Guerra N P - - 2001
The ability of Lactococcus lactis subsp. lactis CECT 539 and Pediococcus acidilactici NRRL B-5627 to produce bacteriocins on both diluted and concentrated whey was investigated in batch fermentations. Both strains produced the higher amounts of biomass and bacteriocin titres on diluted whey. Luedeking and Piret expression was able to model ...
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