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  • Articles  (4)
  • Manganese
  • 1990-1994  (4)
  • 1945-1949
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 31 (1992), S. 138-146 
    ISSN: 1436-6215
    Keywords: Manganese ; totalparenteralnutrition ; enteralnutrition ; dailyintake ; Mangan ; total parenterale Nahrung ; enterale Nahrung ; tägliche Aufnahme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Seit 1931 ist bekannt, daß Mangan ein essentielles Spurenelement bei Tieren ist. Heute weiß man, daß Manganmangel bei Tieren zu einer Vielfalt an Stoffwechseldefekten führt. Für den Menschen ist die sichere Versorgung durch die enterale Ernährung mit 2,5–5 mg pro Tag gewährleistet, für die parenterale Ernährung wird eine Dosis von 0,15–0,8 mg pro Tag vorgeschlagen. Die Mangangehalte von Bestandteilen der Nahrung und von Infusionslösungen wurden durch Atomabsorptions-Spektrometrie bestimmt. Die Ergebnisse wurden mit den (aus Tabellen) kalkulierten Werten verglichen. Der Mangangehalt der Kleinkomponenten und Zusatzstoffe einschließlich der Aromastoffe wurde ebenfalls berücksichtigt. Aus dem täglichen Gesamtverzehr wurde eine Manganaufnahme von 192–7373 µg berechnet. In der parenterelen Ernährung betrug die Manganmenge der Lösung vor Zugabe einer Supplementmischung (Oligo-Komplex) 0,2% der Gesamtdosis an Mangan. Nach Zugabe der Oligo-Komplex-Mischung wurde eine tägliche Aufnahme von 5,02±0,16 pro Tag festgestellt.
    Notes: Summary Managanese has been proven to be an essential trace element in animals since 1931. Today, it is known that manganese deficiency results in a wide variety of structural and physiological defects in animals. For humans, the safe and adequate range of intakes for manganese by enteral nutrition is 2.0 to 5 mg per day; for parenteral nutrition a range of 0.15 to 0.8 mg per day is proposed. The manganese content of components of enteral nutrition (EN) and total parenteral nutrition (TPN) solutions is determined using electrothermal atomic absorption spectrometry. Comparison is made between calculated and measured values. The manganese present in supplementary nutrition and flavor stuffs is also measured. The intake of manganese by EN is calculated based on the daily administration, and is found to vary from 192 to 7373 µg per day. In prepared TPN-solutions, the manganese contribution of all components before adding the Oligo Complex is found to be less than 0.2% of the total manganese content. After addition of the Oligo Complex mixture, a mean daily intake of 5.02±0.16 mg per day is found.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2285
    Keywords: Calcium ; Fagus sylvatica ; Magnesium ; Manganese ; Mineral content ; Potassium ; Seasonalvariation ; Xylem sap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a 35-year-old calcareous beech forest stand five beech trees (Fagus sylvatica L.) were felled every 2 weeks, and xylem sap was obtained by means of water displacement from the lowest trunk sections, each 100 cm in length. From mid-October 1988 to mid-October 1989 a total of 130 trees were investigated. The seasonal variations of the Ca, Mg, K and Mn contents, as well as those of pH, show four characteristic phases. Additionally, distribution of the mineral contents along the trunk was studied in four trees. The seasonal increase and decrease of xylem sap mineral contents along the trunk is shown for the characteristic phenophases. The Ca, Mg, K, and Mn contents of xylem saps were determined by means of atomicabsorptionspectrophotometry.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 15 (1993), S. 9-15 
    ISSN: 1432-0789
    Keywords: Barley ; Wheat ; Manganese ; Availability ; Microorganisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of length of dry storage period and subsequent moist incubation on the availability of Mn was examined in a calcareous soil. Increasing the time of dry storage (for up to 4 years) generally increased the availability of Mn as determined by plant growth and Mn concentration in wheat and barley. Moist incubation of stored soil had variable effects on Mn availability depending on how long the soil had been stored before use and on the method used to assess Mn availability. When assessed by Mn concentration in plant tissues, increasing the moist incubation time (from 0 to 30 days) of soil stored dry for 4 years increased Mn availability in soil initially and thereafter decreased it. However, incubation time had little effect on Mn availability in soil stored for only 1 year or soil used fresh from the field. When Mn availability was assessed using a chemical extractant (DTPA; diethylenetriaminepentaacetic acid), both soils showed an initial increase in Mn availability immediately on wetting. However, Mn availability in the soil stored for only 1 year decreased rapidly and remained consistently below that of soil stored for 4 years. In the latter soil, Mn availability also decreased but only after a few days. Microbial studies indicated that there was a decrease in the ratio of Mn oxidising to Mn reducing microorganisms with increasing storage time. Inoculation of one soil with another suggested that the factor responsible for the low Mn availability in soils stored for a short period could be transferred to soils stored for a longer period. These results suggest that the change in Mn availability in a calcareous soil with dry storage is a result of changes in microbial populations that cannot be fully restored by moist incubation.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 31 (1992), S. 35-41 
    ISSN: 1573-0867
    Keywords: Manganese ; nitrogen ; wheat ; Triticum aestivum L. ; take-all (Gaeumannomyces graminis)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Five field experiments are described which measured the effect of take-all on grain yield of wheat when 5 levels of manganese fertilizer were applied in a factorial combination with 5 different types of nitrogen fertilizer. Ammonium nitrogen fertilizer, either as ammonium sulphate or ammonium chloride, lowered the severity of take-all. By contrast, sodium nitrate had no effect on the incidence and severity of take-all. Ammonium chloride and ammonium sulphate were equally effective at controlling take-all, suggesting that the chloride or sulphate ion had little or no effect on the disease. Manganese sulphate decreased take-all severity at two trial sites. Where manganese was deficient, an application of manganese lowered the severity of take-all, had no effect on the incidence and increased the dry matter and grain yields of the wheat plants. There were no beneficial effects of applied manganese if the wheat plants were adequately supplied with soil manganese. The results suggest that take-all is more severe where plants are deficient in either manganese or nitrogen. The work also suggests that manganese deficiency is not necessarily the reason why the wheat plants grown on the acid soils of south-west Western Australia are prone to take-all.
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