Search for dissertations about: "humic acids"
Showing result 1 - 5 of 21 swedish dissertations containing the words humic acids.
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1. Food Quality for Zooplankton in Humic Lakes
Abstract : Food quality affects growth, reproduction and community structure of zooplankton, and has implications for nutrient cycling and the transfer of energy and matter in aquatic food chains. While the issue of food quality in clear water lakes has received great recent attention, studies on food quality for zooplankton in humic lakes are scarce. READ MORE
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2. Palaeodiet and Infant Feeding in Coastal Arctic Settlements : Insights from stable isotope analysis of bone and dentine collagen and amino acids
Abstract : This dissertation investigates the day-to-day activities that sustained human societies in the arctic and subarctic environments of North America and Siberia over the past 1500 years. Maintenance activities, such as food preparation, childcare, and the care of domestic animals, are commonly inflected by social identity and can provide insight into the experience of gender among archaeological and historical populations. READ MORE
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3. Physico-chemical properties of some aquatic fulvic acids - functional groups and stability
Abstract : Humic material constitutes a category of naturally produced organicmacrocompounds, widely spread in both terrestrial and aquatic systems and accounting for up to 70% of the total soil carbon and 50% of the dissolved organic carbon in surface waters. Humic material is formed as the result of complex chemical transformations of biomass. READ MORE
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4. Enrichment of biogenic and anthropogenic organic substances on sea spray aerosols
Abstract : The world’s oceans are the source of one of the most abundant types of natural aerosols, namely sea spray aerosols (SSA). By scattering solar radiation, SSA play a significant role in controlling the Earth’s radiation budget, while they are also involved in the formation of clouds, acting as cloud condensation nuclei (CCN). READ MORE
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5. Effects of humic substances and pH on the speciation and adsorption of cadmium, mercury and arsenic
Abstract : The emission of acidifying substances to air causes not only immediate, easily observable effects on the environment, but also slowly emerging indirect effects. Among the latter, special attention has been given to changes in mobility and bioavailability of trace elements in the environment. READ MORE