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Results 501 - 550 of 1170
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López-Millán A F - - 2001
Experiments have been carried out with field-grown pear trees to investigate the effect of iron chlorosis on the composition of the leaf apoplast. Iron deficiency was associated with an increase in the leaf apoplastic pH from the control values of 5.5-5.9 to 6.5-6.6, as judged from direct pH measurements in ...
Ripoche A - - 2001
The fatty acid composition of pork fat determines its processing quality. FTIR spectroscopic methods were evaluated on pork back and breast fat, directly on fat slices and on the fat extracts. Near infrared transmission and middle infrared using an ATR method were developed to determine the fatty acid content in ...
Green A J - - 2001
The bioI gene has been sub-cloned and over-expressed in Escherichia coli, and the protein purified to homogeneity. The protein is a cytochrome P450, as indicated by its visible spectrum (low-spin haem iron Soret band at 419 nm) and by the characteristic carbon monoxide-induced shift of the Soret band to 448 ...
Hammarberg T - - 2001
Lipoxygenases are a group of non-heme iron dioxygenases which catalyze the formation of lipid hydroperoxides from unsaturated fatty acids. 5-Lipoxygenase (5LO) is of particular interest for formation of leukotrienes and lipoxins, implicated in inflammatory processes. In this study, electron paramagnetic resonance (EPR) spectroscopy was used to investigate the active site ...
Timón M L - - 2001
The fatty acid composition of the triacylglycerols and free fatty acids of subcutaneous (internal and superficial layers) and intermuscular fat and the contribution of these fatty acids to the formation of volatile compounds were determined in dry-cured Iberian ham. The profile of the fatty acids and volatile compounds showed that ...
Wenming D - - 2001
The sorption and desorption of Eu(III) as a representative of trivalent lanthanides and actinides on bentonite, alumina, red earth and red earth treated to remove free iron oxides were comparatively investigated by using batch technique and radiotracer 152 + 154Eu. The effects of pH, ionic strength, fulvic acid, iron oxides ...
Wauters T - - 2001
Tannic acid inhibited the growth of the yeast Saccharomyces cerevisiae. Growth medium supplementation with more nitrogen or metal ions showed that only iron ions could restore the maximal growth rate of S. cerevisiae. Tannic acid resistant mutants were previously isolated by screening for tannic acid resistance and were all cytoplasmic ...
Chen X L - - 2001
A new red-region fluorogenic substrate, tetra-substituted amino aluminium pthalocyanine, was developed for the selective determination of H2O2 based on the catalytic effect of mimetic peroxidases, viz., hemin or iron tetrasulfonatophthalocyanine (FeTSPc). Under the optimum conditions, the linearity of the calibration graph for the determination of H2O2 with hemin (or FeTSPc) ...
Chen Y K - - 2001
In dopaminergic neurons, free radicals are likely produced via dopamine metabolism by monoamine oxidase or via its auto-oxidation, a process facilitated by transition metals. In this study we examined the effect and possible mechanisms of apomorphine to reduce iron- and dopamine-induced 2,3-dihydroxybenzoic acid (2,3-DHBA) formation by microdialysis. We have shown ...
Wakeling L T - - 2001
Pecans from the cultivars Wichita and Western Schley [Carya illinoinensis (Wangenh.) K. Koch] collected over three years were analyzed for the following constituents: total lipid content; fatty acid profiles; sucrose content; protein; total dietary fiber; the minerals magnesium, calcium, potassium, sulfur, phosphorus, boron, copper, iron, manganese, sodium, zinc, and aluminum; ...
Ashmead H D - - 2001
This paper summarizes several studies which describe significant increases in the intestinal absorption of iron from iron amino acid chelate compared to inorganic iron salts. While these increased uptakes of iron from the amino acid chelate into mucosal tissue are highly significant, this paper also demonstrates that there is a ...
Fairweather-Tait S J - - 2001
Sodium iron ethylenediaminetetracetic acid (NaFeEDTA) has been recommended for food fortification programmes to improve iron status but its performance in commercial products has not been evaluated. The effect of EDTA on iron absorption from fortified cornflakes, given as part of a typical Western breakfast, was determined in a double-blind randomised ...
García-Casal M N - - 2001
The effect of a pH change from 2 to 6 was tested on the solubility of ferrous sulfate, ferrous fumarate, iron bis-glycine chelate (Ferrochel) and sodium-iron ethylenediaminetetraacetic acid (NaFeEDTA). It was found that at pH 2 ferrous sulfate, Ferrochel and NaFeEDTA were completely soluble and only 75% of iron from ...
Jood S - - 2001
Three hull less and nine hulled barley cultivars were grown during 1995-96 at Research Farm, CCS Haryana Agricultural University, Hisar, India and were used for chemical analysis such as nutritional and antinutritional parameters. Dolma, a hull less barley cultivar had higher contents of protein, fat, starch, in vitro digestibility of ...
Chakrabarti S K - - 2001
Isolated rat lymphocytes in salts-glucose medium (pH 7.2) were incubated with nickel chloride, nickel acetate, nickel sulfate, and a soluble form of nickel subsulfide (0-2 mM) at 37 degrees C for 2 h. The soluble form of nickel subsulfide induced a significant increase in DNA-protein crosslinks (DPXLs) (111%) beginning at ...
Abdel-Kader Z M - - 2001
Decorticated cracked broadbeans flour (DCBF) was used to replace 5%, 10%, 15% and 20% of the wheat flour (WF) in the Egyptian 'Balady' bread. The nutrient composition of DCBF, WF, wheat bread, and DCBF-fortified bread was studied. When DCBF fortification was increased from 0 to 20%, there was an increase ...
Davidsson L - - 2001
BACKGROUND: Iron-fortified school breakfasts have been introduced in Peru to combat childhood iron deficiency. OBJECTIVE: We evaluated whether iron absorption from a school breakfast meal was improved by increasing the ascorbic acid content or by adding an alternative enhancer of iron absorption, Na2EDTA. DESIGN: In a crossover design, iron absorption ...
Mitani H - - 2001
Kojic acid, a fungal metabolic product, has been used as a skin-depigmenting agent in skin care products marketed in Japan. Iron in the skin is known to be involved in wrinkling as a result of chronic photodamage. Kojic acid was expected to have anti-wrinkling activity, since it possesses iron-chelating activity. ...
Ferreira S L - - 2001
A procedure is proposed for the separation and determination of molybdenum in iron matrices by a batch process. It is based on the solid-phase extraction of the molybdenum(V) ion as thiocyanate complex on polyurethane (PU) foam. The extraction parameters were optimized. Using 0.20 mol L-1 hydrochloric acid, a thiocyanate concentration ...
Singh G - - 2001
Six green leafy vegetables and herbs - spinach, amaranth, bengal gram, cauliflower, mint, coriander and carrots - were analyzed for moisture, protein, ascorbic acid, beta-carotene, total iron, ionizable iron (as % of total iron) in vitro iron (% of total iron), copper, manganese and zinc. Moisture content of the leaves ...
Tarng D C - - 2001
Provision of sufficient available iron is a prerequisite to ensure the optimal response to recombinant human erythropoietin (rHuEpo). Functional iron deficiency (a state when iron supply is reduced to meet the demands for increased erythropoiesis) is the common cause of rHuEpo hyporesponsiveness in dialysis patients who have normal iron status, ...
Dombek T - - 2001
The dechlorination of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) via reaction with metallic iron under low-oxygen conditions was studied using reaction mixture pH values of 2.0, 3.0, and 3.8. The pH control was achieved through addition of sulfuric acid throughout the duration of the reaction. The lower the pH of the reaction mixture, the ...
Piedrafita J - - 2001
The objective of this study was to investigate differences in adipose tissue fatty acid composition among stress genotypes as well as to determine relationships of those fatty acids with performance, carcass and meat quality traits. Haplotypic analysis of parents and offspring was employed to assign 48 pigs to three stress ...
Brenner F J - - 2001
Constructed wetlands have been used for over two decades for the treatment of acid mine drainage (AMD). Through a variety of physical, chemical, biological processes, these wetlands are effective in reducing acidity and removing up to 99% of iron and aluminium from AMD, but they only remove 20-30% of the ...
Feilberg A - - 2001
Many types of organic aerosol material have been found to behave as viscous liquids. In the current work, photodegradation of selected nitrated polycyclic aromatic compounds, 1-nitropyrene and 3-nitrofluoranthene, in viscous organic phases used as model systems for organic aerosols has been investigated. Experiments have been conducted in the presence and ...
Stolt M - - 2001
Five different iron monocarboxylates were used as catalysts in the two-step preparation route of lactic acid based poly(ester-urethane)s (PEU). In the first step, a hydroxyl-terminated poly(lactic acid) prepolymer was prepared, which in the second step was linked with 1,6-hexamethylene diisocyanate. The resulting polymers were characterized by titration, size exclusion chromatography, ...
Mos L - - 2001
There are indications that toxic algal blooms are increasing because of pollution of coastal waters and worldwide shipping. This mini-review deals with the marine biotoxin domoic acid, also known as amnesic shellfish poison, and its main producing pennate diatom genus Pseudo-nitzschia (Bacillariophyceae). Besides contamination of seafood, these organisms have also ...
Schnabelrauch M - - 2000
New analogs of bacterial siderophores with one, two or three catecholate moieties were synthesized using various mono- and diamino acid and dipetide scaffolds, respectively. In addition to 2,3-dihydroxybenzoyl siderophore analogs and their acylated derivatives, 3,4-dihydroxybenzoyl derivatives were prepared. Furthermore, the synthesis of a new triscatecholate serving as an intimate model ...
Giordani A - - 2000
The ultraviolet-A (UVA) component of sunlight produces in cutaneous cells a highly toxic oxidative stress mediated by redox cycling reactions of Fe ions. A tight regulation of cell iron uptake and storage by iron regulatory proteins (IRP) of keratinocytes and fibroblasts avoids these damaging reactions. We report here that about ...
Morii M - - 2000
We sought to evaluate the effect of iron ion on the absorption of mycophenolate mofetil, which is an immunosuppressive agent. The pharmacokinetics of mycophenolic acid were studied. A randomized crossover design with two phases was used. A 7-day washout period separated the two treatment conditions. In the first phase, the ...
Gurrieri S - - 2000
In this work, Sicilian cultivars of prickly pear (Opuntia ficus indica) were partially characterized from a chemical point of view, and the possibility of long-term storage of their juice was investigated. The acidity of the prickly pear juice turned out to be very low (0.02%) and the pH very high ...
von Wirén N - - 2000
Graminaceous plant species acquire soil iron by the release of phytosiderophores and subsequent uptake of iron(III)-phytosiderophore complexes. As plant species differ in their ability for phytosiderophore hydroxylation prior to release, an electrophoretic method was set up to determine whether hydroxylation affects the net charge of iron(III)-phytosiderophore complexes, and thus chelate ...
Bond P L - - 2000
This study presents population analyses of microbial communities inhabiting a site of extreme acid mine drainage (AMD) production. The site is the inactive underground Richmond mine at Iron Mountain, Calif., where the weathering of a massive sulfide ore body (mostly pyrite) produces solutions with pHs of approximately 0.5 to approximately ...
Abdallah F B - - 2000
Iron loss in vitro by the iron scavenger bovine lactoferrin was investigated in acidic media in the presence of three different monoanions (NO(3)(-), Cl(-) and Br(-)) and one dianion (SO(4)(2-)). Holo and monoferric C-site lactoferrins lose iron in acidic media (pH< or =3.5) by a four-step mechanism. The first two ...
Ahmad S - - 2000
The in vitro effects of four different species of arsenic (arsenate, arsenite, monomethylarsonic acid, and dimethylarsinic acid) in mobilizing iron from horse spleen ferritin under aerobic and anaerobic conditions were investigated. Dimethylarsinic acid (DMA(V)) and dimethylarsinous acid (DMA(III)) significantly released iron from horse spleen ferritin either with or without the ...
Sharma D C - - 2000
Some enzymes and intermediates of heme synthesis were determined in blood and urine of 26 women with severe iron deficiency anemia (IDA). Erythrocyte free protoporphyrin was almost doubled and delta-aminolevulinate dehydrase significantly raised. But urinary excretion of delta-aminolevulinic acid and reticulocyte ferrochelatase were significantly reduced in iron deficiency anemia. Hence ...
Carrapiso Ana I - - 2000
The purpose of this study was to optimize a rapid method for fatty acid analysis in Iberian pig subcutaneous adipose tissue. An in situ transesterification method was used to avoid the lengthy lipid extraction step. Samples were in situ transesterified with 5% HCl/methanol at 70°C, and toluene was used to ...
Karbownik M - - 2000
Phenylhydrazine and iron overload result in augmented oxidative damage and an increased likelihood of cancer. Melatonin is a well known antioxidant and free radical scavenger. The aim of this study was to determine whether melatonin would protect against phenylhydrazine-induced oxidative damage to cellular membranes and to evaluate the possible role ...
Grubb D G - - 2000
Batch equilibration experiments using a low calcium ( approximately 1 wt.% as CaO), acidic (pH approximately 4.5) Type F fly ash demonstrated phosphate immobilization on the order of 100% to 75% for 50 and 100 mg P/l solutions, respectively. A loosely compacted column of fly ash similarly removed 10 mg ...
Zijp I M - - 2000
Iron deficiency is a major world health problem, that is, to a great extent, caused by poor iron absorption from the diet. Several dietary factors can influence this absorption. Absorption enhancing factors are ascorbic acid and meat, fish and poultry; inhibiting factors are plant components in vegetables, tea and coffee ...
Musaiger A O - - 2000
Proximate, mineral, fatty acid and cholesterol composition of eight traditional sweets commonly consumed in the Arab Gulf countries were determined. Four sweets were obtained from Bahrain, whereas the other sweets were obtained from Oman. Protein level ranged from 0.2 to 9.0%, while the fat content ranged from 7.9 to 18.0%. ...
Urbano G - - 2000
This review describes the present state of knowledge about phytic acid (phytate), which is often present in legume seeds. The antinutritional effects of phytic acid primarily relate to the strong chelating associated with its six reactive phosphate groups. Its ability to complex with proteins and particularly with minerals has been ...
Chappell L L - - 2000
225Ac (t(1/2) = 10 days) is an alternative alpha-emitter that has been proposed for radioimmunotherapy (RIT) due to its many favorable properties, such as half-life and mode of decay. The factor limiting use of (225)Ac in RIT is the lack of an acceptably stable chelate for in vivo applications. Herein ...
Sobha G - - 2000
Camel kidney ferritin was isolated from a tissue homogenate by thermal denaturation, ammonium sulphate fractionation, Sephacryl S-300 gel filtration and DEAE-blue gel affinity chromatography. The yield and the iron and neutral carbohydrate contents were 0.012 mg/g wet tissue, 4.0% and 2.7%, respectively. The phosphate:iron ratio was 0.13, twofold lower than ...
Murakami T - - 2000
Nitrile hydratase from Rhodococcus sp. N-771 is an alphabeta heterodimer with a nonheme ferric iron in the catalytic center. In the catalytic center, alphaCys112 and alphaCys114 are modified to a cysteine sulfinic acid (Cys-SO2H) and a cysteine sulfenic acid (Cys-SOH), respectively. To understand the function and the biogenic mechanism of ...
Sista R V - - 2000
Catalysis by iron ascorbate and activated methemoglobin generated different oxidative responses in chicken muscle model systems. In iron ascorbate systems, large increases in hydroperoxides and thiobarbituric acid-reactive substances (TBARS) occurred during the initial stage of incubation. Thereafter, iron ascorbate catalysis led to a slow increase in the oxidation of triacylglcyerol ...
Zhu B Z - - 2000
The production of hydroxyl radicals by tetrachlorohydroquinone (TCHQ, a major metabolite of the widely used biocide pentachlorophenol) in the presence of H(2)O(2) was studied by salicylate hydroxylation method. HPLC with electrochemical detection was used to measure the levels of 2,3- and 2,5-dihydroxybenzoic acid (DHBA) formed when the hydroxyl radicals react ...
Reddy M B - - 2000
BACKGROUND: Considerable data are available on the individual effects of dietary factors on nonheme-iron absorption, but their combined effect when they are present in the same meal is not known. OBJECTIVE: Our objective was to predict the bioavailability of iron from complex meals that are consumed commonly in the United ...
Howard D H - - 2000
The zoopathogenic fungus Histoplasma capsulatum, like other eukaryotic aerobic microorganisms, requires iron for growth. Under conditions of low iron availability, the fungus secretes hydroxamates that function as siderophores (iron chelators). The experiments to be reported were designed to gather further information on the hydroxamate siderophores of H. capsulatum. The fungus ...
Muna Z A - - 2000
Reactive oxygen species are thought to induce cellular damage and to play a pathological role in several human diseases. Tetradecylthioacetic acid (TTA) was previously reported to prevent the oxidative modification of low-density lipoprotein (LDL) particles and to act as an antioxidant. In this study we present a new fatty acid ...
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