The relevance of biogeochemical gradients for turnover of organic matter and contaminants is yet poorly understood. This study aims at the identification and quantification of the interaction of different redox processes along gradients. The interaction of iron-, and sulfate reduction and methanogenesis will be studied in controlled batch and column experiments. Factors constraining the accessibility and the energy yield from the use of these electron acceptors will be evaluated, such as passivation of iron oxides, re-oxidation of hydrogen sulfide on iron oxides. The impact of these constraints on the competitiveness of the particular process will then be described. Special focus will be put on the evolution of methanogenic conditions in systems formerly characterized by iron and sulfate reducing condition. As methanogenic conditions mostly evolve from micro-niches, methods to study the existence, evolution and stability of such micro-niches will be established. To this end, a combination of Gibbs free energy calculations, isotope fractionation and tracer measurements, and mass balances of metabolic intermediates (small pool sizes) and end products (large pool sizes) will be used. Measurements of these parameters on different scales using microelectrodes (mm scale), micro sampling devices for solutes and gases (cm scale) and mass flow balancing (column/reactor scale) will be compared to characterize unit volumes for organic matter degradation pathways and electron flow. Of particular interest will be the impact of redox active humic substances on the competitiveness of involved terminal electron accepting processes, either acting as electron shuttles or directly providing electron accepting capacity. This will be studied using fluorescence spectroscopy and parallel factor analysis (PARAFAC) of the gained spectra. We expect that the results will provide a basis for improving reactive transport models of anaerobic processes in aquifers and sediments.
Web Feature Service (WFS) zum Thema Einrichtungen der Drogen- und Suchthilfe in und um Hamburg. Zur genaueren Beschreibung der Daten und Datenverantwortung nutzen Sie bitte den Verweis zur Datensatzbeschreibung.
Web Map Service (WMS) zum Thema Einrichtungen der Drogen- und Suchthilfe in und um Hamburg. Zur genaueren Beschreibung der Daten und Datenverantwortung nutzen Sie bitte den Verweis zur Datensatzbeschreibung.
Shallow groundwater of the huge deltaic systems of Asia like the Red River Delta in Vietnam is often enriched in inorganic arsenic (As), threatening the health of millions of residents. The massive abstraction of groundwater in these areas locally causes an irreversible mixing of arsenic-free groundwater resources with arsenic-rich groundwater. Increased concentrations of competitive anions, especially phosphate (PO43-), decrease the immobilization capacity of the sediments. During transport, the mobility of dissolved As in local aquifers is strongly influenced by adsorption to sedimentary and ubiquitously occurring iron(oxyhydr)oxides. Additionally, arsenic-rich groundwater is often enriched in reduced iron (Fe2+) as well, which is capable to react with iron(oxyhydr)oxides, thereby inducing mineral transformations. Such transformations permanently affect the arsenic adsorption and immobilization capacity of the sediments.Within the scope of this research project, the underlying mechanisms related to As transport and the resulting threat to arsenic-free groundwater resources will be characterized in cooperation with the Swiss Federal Institute of Aquatic Science and Technology (Eawag). The research concept aims at assessing the complex interactions within the arsenic-iron-phosphate-system under field conditions at a study site next to the Red River. First, filtration experiments using local groundwater enriched in As and PO43- will be used to determine the As adsorption capacity of different and previously geochemically characterized iron(oxyhydr)oxides. In a second step, sample carrier containing As loaded iron(oxyhydr)oxides will be introduced into surface near aquifer parts of the study site (via existing groundwater monitoring wells). These samples will be exposed to local groundwater characterized by increased As, Fe2+ and PO43- concentrations for the following nine months. Using the in situ exposition of predefined iron(oxyhydr)oxides, it will be possible to distinguish potential mineral transformations and their influences on the As immobilization capacity of the respective iron(oxyhydr)oxides. By combining the results and outcomes of the field experiments, new and important conclusions regarding the mobility of As can be drawn. The data can be used to create a hydrochemical transport model describing reactive As transport within the investigation area. In addition, the results of the in situ exposition experiments will allow to draw conclusions in respective to the long term As immobilization capacity of different iron(oxyhydr)oxides, which is an essential information regarding in situ decontamination techniques.
Der Datensatz enthält die Standorte von Parkhäusern, Tiefgaragen und Parkplätzen im Hamburger Stadtgebiet mit Informationen über Öffnungszeiten, Preise, Anzahl der Stellplätze, Einfahrtshöhen sowie teilweise Belegungsdaten (freie Stellplätze) und Anzahl der Frauen- und Behindertenstellplätze. Zum Teil werden in 5-minütigen Abständen Parkplatzbelegungsdaten aus dem Parkleitsystem der Stadt Hamburg übermittelt. Diese Echtzeitdaten sind ungeprüft. Der Datensatz ist nicht vollständig, sondern enthält Angaben von privaten Betreibern, die der Freien und Hansestadt Hamburg zur Verfügung gestellt wurden. Sollte ein Parkhaus / Parkplatz fehlen, kann der in den Metadaten angegebene Ansprechpartner gerne darauf hingewiesen werden. Eine Aufnahme in den Datensatz wird dann geprüft.
Web Feature Service (WFS) zum Thema Praevention und sexuelle Gesundheit Hamburg. Zur genaueren Beschreibung der Daten und Datenverantwortung nutzen Sie bitte den Verweis zur Datensatzbeschreibung.
Web Map Service (WMS) zum Thema Prävention und sexuelle Gesundheit Hamburg. Zur genaueren Beschreibung der Daten und Datenverantwortung nutzen Sie bitte den Verweis zur Datensatzbeschreibung.
Der Genehmigungsinhaber einer kerntechnischen Anlage ist laut "Richtlinie zur Emissions- und Immissionsüberwachung kerntechnischer Anlagen (REI)" für die Überwachung und Bilanzierung von Ableitungen (Emissionen) radioaktiver Stoffe mit der Abluft und dem Abwasser aus seiner Anlage nach Art und Höhe der Radioaktivität verantwortlich. Darüber hinaus hat er Messungen in der Umgebung seiner Anlage (Immissionsüberwachung) durchzuführen. Unabhängig von den vom Betreiber durchzuführenden Überwachungsmaßnahmen erfolgen Kontrollen in der Umgebung durch unabhängige/amtliche Meßstellen mittels eigener Überwachungsprogramme. In diesen Programmen sind Probeentnahme- und Meßorte,Kontrollmedien sowie Meß- und Probeentnahmeintervalle festgelegt. Die Ergebnisse der Überwachung werden in Quartals- und Jahresberichten dokumentiert und der zuständigen Aufsichtbehörde übergeben.
On 18 Januar 1986 at the east-looking slope of the Kleiner Watzmann in the Berchtesgaden National Park a snow avalanche came down from an elevation of about 2.000 m to the Königssee near St. Bartholomae (610 m above see level). It destroyed 12 to 15 ha of old growth forests dominated by beech (Fagus sylvatica); about 2.000 m3 of wood were thrown down. The soil survace was not intensively effected by the snow avalange. Because the area is situated in the central protection zone of the national park no clearing procedure was done, and a free stand develeopment without any direct impact of man is allowed to take place. In 1989 permanent plots (3 transects, each starting in the surrounding forest and crossing to avalanche area) were established. Vegetation and stand structure records were carried out in 1989, 1994 and 1999. Vegetation development in the first place is characterised by (1) a re-establishment of the tree layer by the (beech) trees, which were bent to the ground but not killed by the avalanche, (2) by seedling and sapling establishment (especially Acer and Fraxinus, but not by pioneer trees) and (3) by continuing floristic composition of the ground vegetation (coverage increasing or decresing depending on the light conditions).
Outbreaks of foodborne illness linked to consumptions of fresh, or partially processed, agricultural products are a growing concern in industrialized and developing countries. The incidence of human pathogens on fresh fruits and vegetables is often related to the use of recycled wastewaster in surface irrigation as well as high amounts of animal manure in agricultural management practice. Thereby the soil inhabiting fauna plays an important role in the transport and dissemination of microorganisms. The focus of the proposed project is on nematodes, well known vectors for bacteria and viruses in soil. The major goals are to: (1) survey human pathogens in soil and on/in free-living and plant parasitic nematodes in agriculture field sites irrigated with recycled wastewater or fertilized with fresh animal manure in Israel and the Palestinian Authority, (2) assess the function of nematodes as vectors in transmitting bacteria from microbial hot spots to plants, and (3) localize bacteria on and/or within the nematode and identify bacterial factors required for survival in the nematode host. Understanding the mechanisms involved in dissemination of human pathogens by nematodes will enhance the ability to develop practical means to minimize contamination of fresh produce and increase safety in food production.
| Organisation | Count |
|---|---|
| Bund | 81 |
| Europa | 16 |
| Kommune | 7 |
| Land | 9 |
| Wissenschaft | 47 |
| Type | Count |
|---|---|
| Förderprogramm | 81 |
| unbekannt | 8 |
| License | Count |
|---|---|
| Offen | 88 |
| Unbekannt | 1 |
| Language | Count |
|---|---|
| Deutsch | 30 |
| Englisch | 78 |
| Resource type | Count |
|---|---|
| Keine | 65 |
| Webdienst | 6 |
| Webseite | 20 |
| Topic | Count |
|---|---|
| Boden | 69 |
| Lebewesen und Lebensräume | 87 |
| Luft | 61 |
| Mensch und Umwelt | 87 |
| Wasser | 63 |
| Weitere | 89 |