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Results 451 - 500 of 544
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Saiki M K - - 1993
Boron (B), molybdenum (Mo), and selenium (Se) were measured in water, sediment, particulate organic detritus, and in various biota--filamentous algae, net plankton, macro-invertebrates, and fishes--to determine if concentrations were elevated from exposure to agricultural subsurface (tile) drainage during the spring and fall 1987, in the San Joaquin River, California. Concentrations ...
Dobrowolski J W - - 1993
The evaluation of the influence of different environmental carcinogenic factors requires interdisciplinary cooperation. Related studies include epidemiological surveys and air, water and soil, chemical, toxicological, and microbiological analyses, supplemented by experimental verification of suspected ecological pathogens and cofactors. A balance of carcinogens and protective agents in the external environment and ...
Orden J A - - 1992
We studied the usefulness of an immunoblot technique for the detection of staphylococcal enterotoxins (SEs) in strains and food extracts. Food samples (milk, yogurt, hot dog sausage, cheese, and mayonnaise) were artificially contaminated with SEA through SEE. Protein A did not interfere with the results; it appeared on electrophoresis gels ...
Gerloff B J - - 1992
The adequacy of current supplemental dietary selenium allowances for dairy cattle has been reviewed from the literature and by monitoring responses of dairy herds in a veterinary practice specializing in nutritional consultation. Both information sources tend to agree that a reference range of 70 to 100 ng of Se/mL of ...
Hermann K - - 1992
Immunoreactive angiotensin I and angiotensin II were found in human urine that was purified on octadecasilylsilica cartridges. The daily excretion of angiotensin I and II in healthy volunteers was 189.00 (SE 38.36) and 17.54 (SE 3.07) pmol/24 h or 148.09 (SE 32.22) and 12.82 (SE 2.34) pmol/L, respectively (n = ...
Barclay M N - - 1992
The selenium content of the 1989 harvest of wheat used for bread making in Scotland ranged from 0.028 microgram/g dry weight for home-grown wheat to 0.518 microgram/g for Canadian wheat. The tonnage values indicate that 13.8% of the wheat used in bread making came from Canada. This reflects in a ...
Liu X - - 1992
The catalytic polarographic determination of selenium(IV) by use of the SeSO(2-)(3) -KIO(3) system is sensitive, accurate, rapid and requires only small quantities of sample. The detection limit for selenium(IV) is 0.04 ng/ml in the final solution. The working range of the calibration is 0.04-2.5 ng/ml. Se(VI) present can be reduced ...
Moser-Veillon P B - - 1992
The bioavailability and metabolism of different chemical species of mineral nutrients in the diet are receiving much attention from research nutritionists. In order to make scientifically based recommendations for mineral intakes, the chemical form of the mineral, with its specific absorption, utilization and retention, needs to be considered. Selenium is ...
Shibata Y - - 1992
Based on the recent development of analytical methods, sensitive systems for the analysis and speciation of selenium and arsenic have been established. A palladium addition technique was developed for the accurate determination of selenium in biological samples using graphite furnace atomic absorption analysis. For the speciation of the elements, combined ...
Gerber A M - - 1991
BACKGROUND: Although the inverse association between socioeconomic status (SES) and blood pressure has often been observed, little is known about the relationship between SES and dietary risk factors for elevated blood pressure. Therefore, this study described the distribution of dietary intakes of sodium, potassium, and calcium and examined the association ...
Messina M - - 1991
The United States produces approximately half of the world's soybeans. Although most of what is produced is used as animal feed, soy-protein products (eg, soy-protein flour, concentrates, and isolates) are used extensively by the food industry, primarily for their functional characteristics, such as emulsification. During the past decade, however, there ...
Benton D - - 1991
The possibility that a subclinical deficiency of the trace element selenium might exist in a sample of the British population was examined by giving a selenium supplement for 5 weeks. Using a double-blind cross-over design, 50 subjects received either a placebo or 100 mcg selenium on a daily basis. On ...
Bratakos M S - - 1991
Fluorimetric determination of selenium in colostrum, transitional and mature human milk gave the following concentrations (mean and standard deviation): 41 +/- 16, 23 +/- 6 and 17 +/- 3 ng Se ml-1, respectively. The ranges for each kind of milk, especially for mature milk, were narrow. For all cases studied, ...
Kim Y A - - 1991
Soy protein concentrate (Promosoy R Plus) was mixed with water to form a thick paste and autoclaved at 121 degrees C for 10 min, 30 min, 2 h, or 4 h. Unautoclaved SPC served as a control. Nitrogen solubility measurements and SDS-PAGE analysis indicated that autoclaving resulted in the formation ...
Ip C - - 1991
Methylated selenides are prominent metabolites at the dietary levels used for obtaining anticarcinogenic effects with selenium. The present study reports the chemopreventive activities of 2 novel selenium compounds, Se-methylselenocysteine and dimethyl selenoxide, in the rat dimethylbenz(a)anthracene-induced mammary tumor model. Other treatment groups were supplemented with either selenite or selenocystine for ...
Razak A A - - 1991
Aspergillus funiculosus was isolated from rotted banana fruits, whereas Alternaria tenuis and Fusarium sp. were isolated from rotted tomato fruits. The isolated fungi tolerated relatively high levels of the fungicide, Dithane, up to 2560 ppm on solid medium, but grew well at 40 ppm when supplemented with liquid medium. They ...
Schuler C A - - 1990
Kesterson Reservoir (Kesterson) received subsurface agricultural drainwater containing high levels of salts and selenium from farmland in the San Joaquin Valley of California. The accumulation of selenium in wetlands and waterfowl foods at Kesterson was investigated during May, August, and December of 1984. High concentrations of selenium vegetation, and aquatic ...
Yoshida M - - 1990
The selenium status of workers handling aromatic nitro-amino (ANA) compounds was evaluated by measurement of their blood and urinary selenium concentrations and blood glutathione peroxidase (GSH-Px) activities. Forty-seven healthy Japanese male workers (42.7 +/- 12.1 yr) handling ANA compounds routinely in a chemical factory were studied as exposed workers, and ...
Boyne R - - 1990
Both selenium and copper deficiencies in rats caused morphological changes in erythrocytes but only copper deficiency resulted in anaemia. Similar but less severe morphological changes occurred when rats consuming selenium- and copper-adequate diets had their food intake restricted to that of the copper-deficient animals. Since selenium deficiency did not affect ...
Hunter D J - - 1990
To assess the validity of the selenium concentration in human toenails as a measure of selenium intake and to determine other correlates of toenail selenium level, the authors examined the predictors of toenail selenium within two subgroups of a large cohort study of US women. Mean toenail selenium was higher ...
Ohlendorf H M - - 1990
This study was conducted to determine selenium (Se) concentrations in tissues of birds collected during the 1983-1985 nesting seasons at Kesterson Reservoir (an area receiving high-Se irrigation drainage water), compare them with birds from reference sites within California's Central Valley, and relate them to food-chain Se concentrations at the study ...
Thomson C D - - 1990
Selenium (Se) concentrations were determined in over 600 foods sampled in Dunedin, New Zealand. Foods included those produced in the region, foods which were expected to contribute significantly to the total Se intake, breads and other wheat products which might be affected by the importation of Australian wheat, and imported ...
Funk M A - - 1990
The selenium content of milk samples from rural Gambian women (n = 55) was evaluated as a function of parity, stage of lactation, and maternal nutrition. Samples were collected during periods of relative food abundance (dry season) and food scarcity (rainy season). Milk selenium was lower (p less than 0.01) ...
Aslam M - - 1990
The effect of SeO3= and SeO4= on NO3- assimilation in 8-d-old barley (Hordeum vulgare L.) seedlings was studied over a 24-h period. Selenite at 0.1 mol m-3 in the uptake solutions severely inhibited the induction of NO3- uptake and active nitrate reductases. Selenate, at 1.0 mol m-3 in the nutrient ...
Billings P C - - 1990
A large body of experimental work has revealed that protease inhibitors (PI) are highly effective suppressors of carcinogenesis. Little is known about the level of PI activity in the diet of the US population. In the present study, we assayed the levels of PI activity in dietary samples from 31 ...
Stacchini A - - 1989
Selenium is an element essential to man. The main environmental pathway of Se-exposure for the general population is through food. As is true for all essential elements, not only deficient but also excessive exposure results in adverse health effects. Between these extremes there is a range of safe and adequate ...
Ogle R S - - 1989
Several field studies of selenium-contaminated lakes and reservoirs have indicated the possibility of selenium-induced reproductive failure in important populations of fish. These investigators have hypothesized that bioaccumulation of selenium through the food chain led to fish selenium levels high enough to elicit toxic responses. The present investigation was designed to ...
Erdman J W JW - - 1989
This review focuses upon the nutritional significance of soy products in the human diet. The impact of the consumption of soy foods on a range of diet and health issues are discussed, including protein quality and growth promoting effects of soy protein, allergies in children, hypocholesterolemic effects of soy protein ...
Gordon I J - - 1989
This paper describes the seasonal changes in vegetation community use by red deer, cattle, goats and ponies on the Isle of Rhum, Scotland. During the winter, when food resources were of low abundance and digestibility, the ungulates showed extensive resource partitioning. During the summer, when resource availability and digestibility was ...
Oldfield J E - - 1989
White muscle disease and other selenium deficiency syndromes, once extremely common in young calves and lambs in Oregon, especially in the areas of volcanic origin east of the Cascade mountain range, prompted extensive investigations in the Oregon Agricultural Experiment Station that resulted in the implementation of large-scale selenium supplementation programs. ...
Oster O - - 1989
The selenium content of food consumed in the Federal Republic of Germany (FRG) was determined for the estimation of the dietary selenium intake of West German adults. The daily dietary selenium intake of men is 47 micrograms (micrograms) and that of women 38 micrograms, corresponding to 0.67 microgram/kg body weight ...
Debski B - - 1989
The concentration of selenium (Se) in milk samples obtained from 26 lacto-ovo-vegetarian (vegetarian) women was significantly greater (22.2 +/- 0.8 ng/ml) than from 12 nonvegetarian women (16.8 +/- 1.3). Mean GSH-Px activity (EC 1.11.1.9) in milk from vegetarians was 146% of that in milk from nonvegetarians. A significant correlation between ...
Kardos J - - 1989
Within the framework of a survey launched by the Istituto Superiore di Sanità to assess the average daily intake of Se with food in the Italian population, a preliminary study was carried out to develop an analytical procedure for the quantification of the element in food products. The method implies ...
Lockitch G - - 1989
Selenium is an essential trace element in humans and animals. Its only established function in humans is the antioxidant activity of glutathione peroxidase, a selenoenzyme. Severe prolonged deficiency may cause a fatal cardiomyopathy. Iatrogenic causes of selenium deficiency include parenteral and enteral nutrition. Low plasma selenium is also found in ...
Ziegler V S - - 1989
More than 340,000 Southeast Asians (SE Asians) have immigrated to the United States since 1971. By 1984, 76,000 SE Asians had settled in California. In areas of the U.S. with large SE Asian populations, many foods specific to those people are readily available. Approximately 5% of the total U.S. population ...
Saiki M K - - 1988
Whole-body samples of bluegills (Lepomis macrochirus) and common carp (Cyprinus carpio) from the San Joaquin River and two tributaries (Merced River and Salt Slough) were analyzed to determine if the concentrations of any of nine elements were elevated as a result of exposure of the fish to agricultural subsurface (tile) ...
Varo P - - 1988
Since fall 1984 all agricultural multinutrient fertilizers in Finland have been supplemented with sodium selenate in an attempt to improve the nutritional quality of local foodstuffs known to be exceptionally low in selenium. The intervention has been effective from the growing season 1985 and it has affected practically all domestic ...
Christensen M J - - 1988
Foodstuffs produced and/or purchased locally were analyzed for Se. The effect of income and gender on Se intake and status of Utah County residents was evaluated by measurement of the following indicators: erythrocyte (RBC) and plasma Se concentration, and activity of Se-glutathione peroxidase (Se-GSH-Px) (EC 1.11.1.9) in RBCs, platelets, and ...
Makino Y - - 1988
This is the first report confirming the presence of 1,2,3,4-tetrahydroisoquinoline (TIQ) and 1-methyl-1,2,3,4-tetrahydroisoquinoline(1MeTIQ) in a number of foods with a high 2-phenylethylamine content. These compounds were determined by gas chromatography-mass spectrometry. This study also confirmed that 1MeTIQ and TIQ can cross the blood-brain barrier in rat. Thus, these compounds, suspected ...
Bjorkstein J - - 1988
The work of many researchers has firmly established that random, non-enzymic crosslinking occurs in aging. Aluminium is one of the most powerful, and of the most widely distributed crosslinking agents. The published information on aluminium content in human nutrition has given highly divergent results. Since aluminium has been implicated in ...
Clark D R DR - - 1987
In May 1984, 332 mammals of 10 species were collected at Kesterson Reservoir (San Joaquin Valley, Merced Co., CA), which had received selenium-laden irrigation drainwater, and at the nearby Volta Wildlife Area, which had not. The study concentrated on the California vole (Microtus californicus); 88 were taken at Kesterson, 89 ...
Sandström B - - 1987
The whole body retention of 75Se, 65Zn, and 54Mn after intake of a labelled vitamin and mineral supplement was followed in 12 healthy volunteers. The supplement had a vitamin and mineral content according to recommended dietary allowances or the so-called "safe and adequate levels" for trace elements, including 15 mg ...
Snook J T - - 1987
Approximately 450 samples of about 100 types of foods consumed by rural and urban Ohioans were analyzed for selenium. Meat, dairy products, eggs, and grain products produced in Ohio have considerably lower selenium content than corresponding products produced in high selenium areas, such as South Dakota. Retail Ohio foods with ...
Schubert A - - 1987
References published since 1960 that report analyses of selenium in foods were collected and evaluated according to criteria in five categories: number of samples, analytical method, sample handling, sampling plan, and analytical quality control. Data were grouped by food item and rated according to the criteria that had been developed ...
Mumma R O - - 1986
An analytical survey of mutagens, nitrosamines, polychlorinated biphenyls, toxic elements, and gamma-emission, as well as the toxicologically protective constituents zinc, selenium, and vitamin C, in 48 pet foods was conducted. Aside from high concentrations of fluoride and iodide in some samples and the expectedly higher concentrations of mercury and selenium ...
Hojo Y - - 1986
Breast milk samples collected sequentially from five lactating women were analysed for selenium and Se-dependent glutathione peroxidase (GSH-Px), which is the only active form of Se known in man. Both GSH-Px and Se contents of breast milk decreased with increasing time of lactation and reached a plateau at a month ...
Mussalo-Rauhamaa H - - 1986
The trace element concentrations of Se, Rb, Zn, Fe, Co, Cs, Mg, Ca, F, Cu, Cr and Ag in serum and of Se, Rb, Zn, Fe, Co and Cs in red cells of Finnish alopecia patients were determined. In addition the Cu and Zn content in 24 h urine and ...
Koivistoinen P - - 1986
For geochemical reasons Finland is a low-selenium area. In the 1960's several diseases associated with serious Se deficiency were observed in domestic animals. Selenium medication of animals and selenium supplementation of animal feeds from 1969 effectively eliminated these diseases. An extensive study of the trace element content of foods consumed ...
Roekens E J - - 1986
An estimation of the dietary selenium intake in different population groups in Belgium has been carried out. 24 h duplicate meals and food consumption statistics combined with concentration levels in different foods, as determined by hydride generation atomic absorption spectrometry, are used. Dietary intake of selenium is low to very ...
Vaessen H A - - 1985
A method for the determination of selenium in food and biological materials has been developed. The method involves sample decomposition in a closed system at 150 degrees C with nitric acid, perchloric acid treatment of the digest, reduction of selenium to the tetravalent state with hydrochloric acid followed by Se-2,3-diaminonaphthalene ...
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