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In order to prepare reaction substrates, there were made 1 M solutions of the following reagents: Ca(OH 2 calcium hydroxide, 95% purity of the Aldrich firm, H3PO4 ortophosphoric acid (V), 85% purity of the POCh firm, and CaCO3 calcium carbonate prepared in the Department of Radiochemistry and Colloid Chemistry.
Thankfully, we already know how to respond to natural disasters - utilities extensively prepare reaction plans and consistently deal with bad weather, earthquakes, etc.
To avoid contamination, filter tips were used to prepare the PCR reactions and separate rooms were used to prepare reaction buffers, to extract DNA, and to examine PCR products.
Glutathione peroxidase activity was measured by methods of Aydin et al. Prepare reaction mixture with 50 mmol/L TRIS buffer (pH 7.6) and add to it 1 mmol/L Na2EDTA + 2 mmol/L reduced glutathione + 0.2 mmol/L NADPH + 4 mmol/L sodium azide + 1000 U glutathione reductase (1 U = 11 μg/ml).
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Three NaOH dosages of 6.0 mM (corresponding to a low pH), 7.8 mM (a medium pH, near the optimal condition), and 9.0 mM (a high pH) were used to prepare reaction-time-dependent samples under different pH conditions.
To minimize the risk of sample contamination, filtered pipet tips were exclusively employed in all steps, and separate work areas were maintained for punching discs from blood spots, extracting gDNA, preparing reaction mixtures, and assembling reaction plates.
Contamination was minimised by preparing reaction mixtures in a dedicated clean room with reagents aliquoted into single use volumes.
Because the N.F.I.B. wanted to distribute its views the moment the Supreme Court spoke, Mr. Summers also prepared reactions to be published in the event of a split verdict or a decision to strike down the whole law.
The absence of any contaminating DNA was confirmed by preparing reactions without reverse transcriptase during the first round of cDNA synthesis and the β-actin gene was selected for a house-keeping gene control.
The reaction mix was prepared in reaction capillaries and a single cell, picked by micromanipulation, was added to this mix.
The Biomek FX Laboratory Automation Workstation (Beckman Coulter), as well as manual pipetting, was used to prepare the reactions.
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