The phrase "ascending concentrations" is correct and usable in written English.
It can be used in scientific or technical contexts to describe a situation where concentrations of a substance increase in a sequential manner.
Example: "The experiment involved testing the effects of the drug at ascending concentrations to determine its efficacy."
Alternatives: "increasing concentrations" or "rising concentrations".
The fixed cells were washed with PBS three times and treated with 1% osmium tetroxide for 2 h, then dehydrated in ascending concentrations of ethanol (30, 50, 70, 80, 90, 95, 100 (v/v)) for 5 min, respectively.
Spirometry, bronchoprovocation test with histamine (PC20), and cough challenge with ascending concentrations of capsaicin (0.49 500 μM) were initially performed in all subjects.
Samples were counterstained with hematoxylin, incubated in ascending concentrations of ethanol and xylol solutions and finally mounted.
After dehydration with ascending concentrations of ethanol (50% to 100%), the samples were embedded at 60°C for 2 days.
The fixed cells were dehydrated in ascending concentrations of ethanol (70%, 80 %, 90 %, 95 and 100%) and embedded in EMbed 8100%esins (EMS, Wandington, PA, USA) via propylembeddede.
Afterwards, slides were dehydrated in ascending concentrations of alcohol.
For autoradiography the histological sections were deparaffinated with xylene and dehydrated with ascending concentrations of ethanol.
After dehydration in ascending concentrations of ethanol and xylene, the specimens were embedded in paraffin.
Sections were then dipped in 0.1% Cresyl Violet for 2 minutes and then dehydrated in ascending concentrations of ethanol prior to clearing in xylenes for 4 minutes.
Within each series, the solutions with each 2.0 ml were applied to the whole tongue of each subject with a pipet in order of ascending concentrations.
After a 30-min en bloc stain with 1% aqueous uranyl acetate, the cells were dehydrated in ascending concentrations of ethanol and embedded in Epon 812.
