Coulter counter


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counter

 [kown´ter]
an instrument or apparatus by which numerical value is computed; in radiology, a device for enumerating ionizing events.
Coulter counter an automated instrument for performing blood counts, based on the principle that cells are poor electrical conductors compared with saline solution.
Geiger counter (Geiger-Müller counter) a radiation counter using a gas-filled tube that indicates the presence of ionizing particles. It is very sensitive to β particles but relatively insensitive to γ and x-rays.
scintillation counter a device for detecting ionization events, permitting determination of the concentration of radioisotopes in the body or other substance.

Coulter counter

An electronic device for automatic blood cell count and analysis. The demands on haematological laboratories are so great nowadays, that manual methods are impracticable and automation is essential.

Coulter counter

an electronic particle analyser, in which a pair of electrodes detects the effect of a passing particle on the impedance. The counter is used to measure the total cell count in a microbiological sample.
References in periodicals archive ?
Furthermore, epigenetic quantification could be combined with epigenetic LDCs: Cell numbers for granulocytes, lymphocytes, and monocytes correlated with cell numbers determined with a Coulter counter (n = 38; validation set IV) (E).
major promastigotes were counted using Z2 COULTER COUNTER. The column "0 [micro]M, before treatment" reflects starting promastigote concentration in the beginning of coincubation with calcimycin.
The percentage of streptavidin-positive TER119-positive cells in each sample was identified by flow cytometry and multiplied by the total number of RBC determined by Coulter Counter to obtain total numbers of biotinylated RBC.
This retrieval seems unlikely in other methods including Coulter counter image based counters flow cytometry and counting chambers.
The number of attached viable cells was counted 96 h later using a model [Z.sub.F] Coulter Counter (Coulter Electronics Inc., Hialeah, FL) and [IC.sub.50] values were calculated, as previously described (Einbond et al., 2004).
"We don't want to just duplicate the capability of a Coulter Counter," he said.
The samples were tested for total solids and turbidity using standard methods and a coulter counter and the results were analyzed.
Particle size was determined using a Coulter Counter Model TAII instrument, which employs an electrical zone sensing method to cause a resistance change (voltage spike) proportional to particle volume.