Description: Das Projekt "Strategies to accelerate the productive biodegradation of several herbicides under environmental stress condition" wird vom Umweltbundesamt gefördert und von UFZ-Umweltforschungszentrum Leipzig-Halle GmbH durchgeführt. Objective: The project is focussed on the biodegradation of persistent herbicides belonging to the groups of triazines, amides and chlorophenoxyalkanes under stress conditions, which are present in every polluted site. Both the physiology of adaptive responses and the regulation of catabolic genes under different stress conditions will be investigated. For herbicides with a low solubility, attempts to increase their bioavailability will be made by promoting biosurfactant activity of microbial consortia. Additionally, the project will focus on toxicological investigations of herbicides and their metabolites using amphibian and insect cell tissues, and toxicity assessments developed for Saccharomyces cerevisiae as an eukaryotic model organism. The project will develop techniques which will allow an increased use of biological methods to remediate sites contaminated with herbicides and other xenobiotics. Objectives This proposal will focus mainly to the investigation of the biodegradation of different herbicides under circumstances related to environmental stress conditions regularly present in soil systems. The main attempts will be: to investigate the degradation kinetics and adaptive responses of herbicide-degrading bacteria under environmental stress conditions in soil systems. to study the effect of increased bioavailability, caused by (bio)surfactants, on the biodegradation of triazines and other pesticides. to examine the regulation and possible corregulation of catabolic genes for different herbicides, and detoxifying enzymes, like Glutathione S-Transferases (GSTs). to assess the toxicological impacts of the herbicides and their possible intermediates using tissues from amphibians and insects, and yeast. Description of the work Herbicides. As herbicides will be tested: triazines (atrazine, simazine, metribuzin); amides (alachlor, metolachlor); and chlorophenoxy compounds (2,4-D, 2,4,5-T, MCPA). Physiological and technical investigations. 1) Measurement of the sorption kinetics and microbial degradation of the herbicides in soil subjected to different forms of stress. Study of the retention, degradation and downward movement of the herbicides in equilibrated soil column microcosms. 2) Examine the effects of different types of stress on the degradation kinetics of herbicides and the physiology of adaptive responses. 3) Study the effects of different environmental stresses on the degradation of herbicides in an off site pilot plant for soil bioremediation provided and engineered by an industrial partner. 4) Studies on the effects biosurfactants causing increased bioavailability on degradation kinetics and the bacterial adaptation. ... Prime Contractor: Umweltforschungszentrum Leipzig-Halle GmbH; Leipzig; Germany.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Schädlingsbekämpfungsmittel ? Herbizid ? Chlorphenol ? Insekt ? Leipzig ? Pestizid ? Amid ? Amphibien ? Triazin ? Genregulation ? Biotensid ? Altlast ? Atrazin ? Bodenbakterien ? Chlorverbindung ? Herbizidabbau ? Simazin ? Tensid ? Main ? Alachlor ? Bodendegradation ? Bodenverunreinigung ? Entgiftung ? Enzym ? Hefe ? Löslichkeit ? Stoffwechselprodukt ? Stress ? Umweltbelastung ? Zytotoxizität ? Bakterien ? Standortwahl ? Schadstoffabbau ? Biologischer Abbau ? Sorption ? Bioverfügbarkeit ? Pilz ? Biologische Behandlung ? Bodenorganismen ? Bodenschadstoff ? Studie ? Toxikologische Bewertung ? Bioremediation ? Toxizität ? Xenobiotikum ? Persistenz ? Off-Site ? Versuchsanlage ? Trichlorphenoxyessigsäure ? Retention [Wasserwirtschaft] ?
Region: Sachsen
Bounding box: 10.40664° .. 10.40664° x 49.29433° .. 49.29433°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2000-01-01 - 2002-12-31
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