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.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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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).

Leukocyte Counts Based on DNA Methylation at Individual Cytosines

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.

Infection-stimulated Anemia Results Primarily from Interferon Gamma-dependent, Signal Transducer and Activator of Transcription 1-independent Red Cell Loss

This retrieval seems unlikely in other methods including Coulter counter image based counters flow cytometry and counting chambers.

A Simple Method of Bead Counting for Next Generation DNA Sequencing

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).

Growth inhibitory activity of extracts and compounds from Cimicifuga species on human breast cancer cells

"We don't want to just duplicate the capability of a Coulter Counter," he said.

MEMS sensor may track single cells

The samples were tested for total solids and turbidity using standard methods and a coulter counter and the results were analyzed.

THE EFFECTIVENESS OF SEDIMENTATION FENCES IN THE VALLEY AND RIDGE PHYSIOGRAPHIC REGION

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.

High performance precipitated silica equivalent to fumed silica in silicone reinforcement