Tham khảo tài liệu 'herbicides environmental impact studies and management approaches part 3', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Herbicide Phytotoxicity and Resistance to Herbicides in Legume Plants 29 an ecosystem a mesosystem a microsystem at the same time defining make-up of substances and their possible interactions Kratasyuk et al. 2001 Wang et al. 2003 Persoone et al. 2003 . Biotests show an interdisciplinary approach to organisms response to the ocurrence of particular chemical substances. In order to determine the impact of these chemical substances biotests employ the methods of physiology and biochemistry. The obtained results unambiguously determine the toxicity of a given sample or lack of its toxicity as compared to the response of an organism not exposed to the activity of all chemical substances present in the analysed sample Simeonov et al. 2007 . Methods used in toxicology and ecotoxicology based on morphological and or physiological disturbances at the cell level or organism level and sometimes as a consequence death of a given organism aim at protecting the environment which indirectly results in protecting the life and health of human population Celik et al. 1996 Dinis-Oliveira et al. 2006 . The current form and shape of these tests and recommendations for their proper usage are a result of more than twenty years of research. In consequence conditions of conducting such tests became standardized costs related to their application decreased the test cultures became widely available Kaza et al. 2007 and measurements unified and comparable. Biotests and their classification Interdisciplinary analytical methods based on living material illustrate potential threats posed by contaminants or their mixture in diversified environmental matrices. The multitude of methods causes many problems with classifying them Persoone et al. 2003 . Primary classifications referred to information about the level of contamination in a given element of the environment considering the place of performed analysis. There are laboratory tests conducted which are based on modelling samples in .
