Grid Counting
Grid Counting - Related Videos
10:19
Using a Hemacytometer to Count Cells
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2023
Many biomedical experiments require manipulation of a known quantity of cells, in order to achieve accurate, reproducible, and statistically-relevant data. Therefore, learning how to count cells is a particularly essential technique for any successful biomedical scientist. The most common way to count cells is by using a hemacytometer - an instrument that bears two laser-etched grids, which aid in the enumeration of an aliquot cells under a simple light microscope. This data can then be used to...
05:47
Counting and Determining the Viability of Cultured Cells
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Cited by 19 •
2008
Determining the number of cells in culture is important in standardization of culture conditions and in performing accurate quantitation experiments. In this video, we demonstrate how cells are counted using a hemacytometer.
11:25
Knowing What Counts: Unbiased Stereology in the Non-human Primate Brain
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Cited by 22 •
2009
The anatomical organization of the primate brain can provide important insights into normal and pathological conditions in humans. Unbiased stereology is a method for accurately and efficiently estimating the total neuron number (or other cell type) in a given reference space1.
06:37
Counting Human Neural Stem Cells
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Cited by 14 •
2007
Knowledge of the exact number of viable cells is required for many tissue culture manipulations. This protocol describes how to differentiate between live and dead cells and quantify cells using a hemacytometer. Although it describes counting human neural stem/precursor cells (hNSPCs), it can be used for other cell types.
08:01
Visualizing Proteins and Macromolecular Complexes by Negative Stain EM: from Grid Preparation to Image Acquisition
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Cited by 137 •
2011
Visualizing protein samples by negative stain electron microscopy (EM) has become a popular structural analysis method. It is useful for quantitative structural analysis, such as calculating a 3D reconstruction of the molecules being studied, and also for qualitative examination of the quality of protein preparations. In this article we present detailed protocols for preparing the EM grids, staining the sample and visualizing the sample in an electron microscope. Novice users can follow these...
FAQs
Consistent cell dimensions allow observations from different locations to be compared on the same spatial basis. If the grid changes between surveys, differences in recorded counts may reflect the sampling layout rather than actual environmental change. Maintaining the same dimensions therefore strengthens comparisons of organism occurrence, environmental features, and density across sites or survey periods.
The same observation rules and counting period should be applied throughout a survey because counting conditions influence what is recorded. Consistency makes differences between cells more interpretable and helps distinguish spatial variation from variation caused by the survey procedure. This is especially important when researchers compare repeated observations to evaluate changes in populations or environmental conditions.
Grid Counting organizes field observations by location, allowing researchers to examine where organisms, objects, or environmental features occur and how frequently they appear. The resulting data can show differences in distribution and density across an area. When observations are repeated, the spatial record can also indicate whether those patterns or conditions change over time.
Researchers first divide the study area into standardized cells, then apply consistent observation rules and a defined counting period to each location. They record the number or occurrence of the selected organism, object, or environmental feature in the cells. The organized records can then be compared across locations and, when surveys are repeated, across time.
The method is useful when researchers need spatially organized evidence from a habitat or landscape. Supported applications include habitat surveys, species monitoring, pollution assessments, and land-use studies. In each case, recording observations by cell helps show how the subject varies across the site rather than treating the entire area as a single undifferentiated sample.
Repeating the same grid-based survey creates comparable records of populations or environmental conditions across time. Researchers can identify changes in where organisms or features occur, as well as shifts in their density or distribution. These findings provide evidence that can help inform conservation decisions and resource-management planning, particularly when conditions vary among locations.