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As the primary saliva passes through the duct system it becomes modified by reabsorption of sodium and chloride (but without water due to the low water permeability) whereby the final saliva secreted into the oral cavity becomes hypotonic with sodium and chloride concentrations much below that of the original primary saliva.
The composition of the final saliva secreted into the oral cavity strongly depends on the secretion rate in such a way that at low flow rates the saliva contains low sodium and chloride concentrations and as the flow rates increase the concentrations of sodium and chloride will rise.
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After collecting the final (60-min) saliva sample, the experimenter told participants that the first day's procedure was now done, and reminded them that they needed to return the following morning to complete the experiment.
The final batch of saliva samples from control group members were excluded from the data analysis due to inconsistencies in lab procedures.
Mean initial and final cortisol levels in saliva were 45.76 ± 36.37 and 18.30 ± 39.99 ng/mL, respectively.
The final product can only contain saliva.
DNA pellets were re-suspended in TE buffer (10 mM Tris HCl, 10 mM EDTA, pH8.0) to a final volume of 500 μl (saliva DNA) or 900 μl (blood DNA).
Briefly, the lentil globulins (4%, w/v) were resuspended in stimulate saliva solution with final concentration 7 mM NaHCO3 and 0.35 mM NaCl, pH 6.75, and stirred for 5 min at 37°C in darkness.
Many of the elevated estradiol and progesterone levels in MWS study subjects over age 50 illustrated in this figure reflected their reported use of HRT; these study samples were excluded from the subsequent analysis of postmenopausal subjects, resulting in a final postmenopausal set of 1023 saliva samples for hormone analysis.
For the flow-cell experiments, an equal volume of PBS was added to halve the cell concentration prior to biofilm formation, whereas for the planktonic experiments the original bacterial suspension was mixed with an equal volume of either PBS, or 50% whole human saliva to give a final concentration of 25% saliva.
During the final two weeks, parents also collected saliva and urine daily.
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