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  • 1
    Publication Date: 1998-09-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 2
    Publication Date: 1998-01-01
    Print ISSN: 0044-264X
    Electronic ISSN: 1435-1293
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Published by Springer
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  • 3
    Publication Date: 1997-01-01
    Print ISSN: 0960-3115
    Electronic ISSN: 1572-9710
    Topics: Biology
    Published by Springer
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Ernährungswissenschaft 37 (1998), S. 288-293 
    ISSN: 0044-264X
    Keywords: Key words Iodine deficiency – eggs – algae – feed ; Schlüsselwörter Jodmangel – Eier – Algen – Futter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Die Jodversorgung ist noch immer in vielen Ländern der Welt, zum Teil auch in Deutschland, unzureichend. Um die Eignung der Jodanreicherung in Hühnereiern zur Ergänzung der Jodmangelprophylaxe zu untersuchen, führten wir Fütterungsversuche mit verschiedenen Jodzulagen an Legehühnern durch. Im Rahmen dieses Versuchs wurde außerdem die Eignung von jodreichen Meeresalgen als Jodquelle in der Hühnerfütterung untersucht. Die Nutzung von Meeresalgen zur Sicherung der Jodversorgung ist vor allem für Länder mit großen Küstengebieten interessant, in denen Meeresalgen als billige, leicht verfügbare Jodquelle zur Verfügung stehen (z.B. Malaysia, Indonesien). Während des vierwöchigen Fütterungsversuchs mit 40 LSL-Legehühnern erhielten vier Tiergruppen KIO3-Zulagen (0,5–5,0 mg/kg), zwei Gruppen bekamen jodreiche Meeresalgen (Eucheuma spinosum) (5% bzw. 10% im Futter). Leistungs- bzw. Qualitätsunterschiede wurden zwischen den Gruppen nicht festgestellt. Nach vierwöchiger Versuchsdauer stieg der Jodgehalt im Gesamtei in Abhängigkeit von der Jodzulage signifikant an [von 7,2 μg/Ei (ohne Jodzulage) auf 51,4 μg/Ei (+5,0 mg Jod/kg)]. In den Versuchsgruppen, die Meeresalgen im Futter erhielten, kam es ebenfalls zu – im Vergleich zur Rationsgruppe ohne Jodzulage – signifikant höheren Jodkonzentrationen im Ei (33,8 μg Jod/Ei). Im Rahmen einer fünftägigen Verzehrsstudie wurden die Hühnereier aus dem oben beschriebenen Fütterungsversuch an 24 schilddrüsengesunde Probanden verabreicht (1 Ei/d). Die absolute Jodkonzentration in Spontanurinproben stieg bei den Probanden (50% Männer, 50% Frauen) in Abhängigkeit vom Jodgehalt der verzehrten Eier bereits am dritten Tag tendenziell an. Obwohl lediglich eine relativ einfache Verzehrsstudie durchgeführt werden konnte, geben die Ergebnisse dennoch erste Hinweise auf den positiven Einfluß, den der Verzehr jodangereicherter Hühnereier auf die Jodversorgung ausüben kann.
    Notes: Summary Iodine deficiency still exists in many countries worldwide, to a certain degree this is also true for Germany. Food of animal origin can be a good source for iodine depending on the feed. To investigate the possible use of laying hen feed enriched with iodine, we conducted a feeding experiment with 40 laying hens receiving feed with different amounts of iodine either as KIO3 or in the form of seaweed. Iodine concentration in eggs increased significantly depending on iodine intake after a 2 week period. Seaweed could also be used as an iodine source by the hens. A subsequent consumption study with 24 volunteers showed that eggs enriched with iodine can increase human's iodine excretion and therefore improve human's iodine supply. This new strategy is thought to accompany salt iodization programs, not to replace them.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 253 (1996), S. 65-73 
    ISSN: 1617-4623
    Keywords: Keywords Dictyostelium discoideum ; Heavy metal resistance ; Extrachromosomal DNA ; Gene amplification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Wild-type Dictyostelium discoideum cells grow- ing on non-toxic levels of nickel chloride or cobaltous chloride accumulate 2–3.5 times as much nickel and at least 1.5 times as much cobalt as cobB mutants. The cobB trait is dominant, confers unstable cobalt and nickel resistance and is correlated with the presence of up to 50 copies of a linear extrachromosomal DNA, approximately 100 kb in length, derived from linkage group III. Independent cobB mutants can be obtained by selection on medium containing either cobalt or nickel. The amplified DNA can be transferred to wild-type strains by electroporation. Strains with mutations at a second cobalt resistance locus, cobA, accumulate the same amount of cobalt, but more nickel than wild-type strains. Our results are consistent with the cobA mutant phenotype being due to internal sequestration of cobalt, and the cobB mutant phenotype being due to reduced net uptake of cobalt and nickel. Energy-dependent nickel export was detectable in wild-type and cobB mutant strains but its role in heavy metal resistance has not yet been proved.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9710
    Keywords: coastal plants ; plant conservation ; Lepidium ; plant-animal interactions ; indicator species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six of the eight indigenous New Zealand Lepidium species are coastal, and have restricted or reduced distributions. One is extinct and the remainder are considered threatened with extinction. This limited distribution is in marked contrast to their apparent abundance in the eighteenth and early nineteenth centuries (1760s–1830s). Accounts from the voyages of Cook, Surville and d'Urville describe L. oleraceum as an abundant coastal plant which was collected extensively for use as an antiscorbutic. However, by the late 19th century, resident botanists were expressing concern about the marked decline in coastal species of Lepidium, a decline which has continued to the present. Ecologically, coastal species of Lepidium are similar, being restricted to open sites often close to the high tide mark. They are commonly associated with bird colonies, and occasionally with fur seal colonies. Traditionally their decline has been attributed to introduced herbivores. However, wild grazing animals were not common until the end of the 19th century, well after the initial decline had occurred. Other possible reasons for their decline include herbivory and predation by rats, and by fungal and invertebrate pests of cultivated Brassicaceae, overcollecting and coastal development. However, we suggest that a major factor in the decline of coastal Lepidium species was a decline in coastal seabirds through predation and seals through culling. Seabirds and seals are critical for the survival of Lepidium species by keeping sites open through disturbance, dispersing seed, and providing nutrient enrichment for plant growth, and their loss has resulted in decline of habitat for Lepidium.
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