56 research outputs found

    Development and evaluation of radioimmunological methods for the determination of oestrogens in the peripheral venous plasma of human subjects

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    Nutrient Enrichment and Food Web Composition Affect Ecosystem Metabolism in an Experimental Seagrass Habitat

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    Food web composition and resource levels can influence ecosystem properties such as productivity and elemental cycles. In particular, herbivores occupy a central place in food webs as the species richness and composition of this trophic level may simultaneously influence the transmission of resource and predator effects to higher and lower trophic levels, respectively. Yet, these interactions are poorly understood

    Attack politics negativity in Presidential campaigns since 1960, 2nd ed./ Buell

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    viii, 392 hal.: ill.; 23 cm
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