Download Institutiones rei herbariae by Josephi Pitton de (1656Â-1708). TOURNEFORT PDF

By Josephi Pitton de (1656Â-1708). TOURNEFORT

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1 Ames II Assay The Ames II assay is a 384-well microplate format modification of the classic bacterial reverse mutation test. It uses a small volume, liquid format for exposure of the bacterial tester strains to test samples in the absence and presence of S9, and a colorimetric readout for ease of scoring the revertant bacteria. In this assay, the frameshift mutations are detected by the traditional strain TA98, and base-pair substitutions by a mixture of six strains named TAMix (Table 1). The TAMix strains and the microfluctuation test procedure that is used in the Ames II assay were developed by Gee et al.

Multiple alerts with a dose–response will lead to the test sample being classified as a clear positive. A test sample is classified negative when no response greater than two times the baseline is recorded. Fold inductions are calculated from the baseline of the actual overnight culture and not from historical data. , 2-2-1 or 4-5-3). The use of the baseline will accommodate for larger standard deviations. If more than one compound is tested with the same overnight culture, the negative (solvent) control wells can be pooled.

3 Overnight Culture Preparation Using sterile technique, overnight cultures of TA98 and TAMix are prepared by performing the following steps: 10 μL of freshly thawed and carefully mixed bacterial stocks are added to 50 mL culture tubes containing 10 mL growth medium and 10 μL of 50 mg/mL ampicillin. The culture tubes are capped loosely (or filter caps are used) to allow for sufficient aeration. The cultures are grown for 12–15 h at 37 °C, 250 rpm in an environmental shaker to the late exponential phase.

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