Proton Count
Proton Count - Related Videos
09:40
Proton Exchange Membrane Fuel Cells
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University The United States consumes a large amount of energy – the current rate is around 97.5 quadrillion BTUs annually. The vast majority (90%) of this energy comes from non-renewable fuel sources. This energy is used for electricity (39%), transportation (28%), industry (22%), and residential/commercial use (11%). As the world has a limited supply of these non-renewable sources, the United States (among others) is...
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.
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.
01:07
Proton (¹H) NMR: Chemical Shift
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2024
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal. Absorption signals of all the protium nuclei in a...
FAQs
Atomic number provides a consistent identifier for distinguishing one element from another when analyzing biological molecules. This allows carbon, nitrogen, oxygen, and phosphorus to be recognized as different elemental components even when they occur within the same molecule. Their identities support accurate interpretation of molecular composition and the chemical structure of cellular compounds.
Proton count identifies which element is present, whereas neutron number distinguishes isotopes of that element and electron number affects its charge. This distinction prevents researchers from treating an isotope or ion as a different element. It also separates changes in nuclear composition from changes in electronic state when interpreting atomic or molecular data.
Recognizing the proton counts of atoms provides a foundation for interpreting which elements make up a biomolecule and how its atoms participate in chemical bonding. In biology, identifying the elemental participants helps connect atomic structure with molecular composition. This perspective is useful when relating the organization of carbon-, nitrogen-, oxygen-, or phosphorus-containing compounds to cellular systems.
The count gives researchers a way to assign elemental identity to individual atomic components of a biomolecule. For example, carbon, nitrogen, oxygen, and phosphorus can be distinguished even when their atoms contribute to the same biological structure. That assignment supports molecular composition analysis and helps clarify which elements are present in cellular compounds.
In isotopic labeling experiments, proton count confirms the element being tracked, while a difference in neutron number identifies an isotope of that element. Researchers can therefore distinguish a changed isotopic form from a different elemental species. This provides a conceptual basis for following labeled carbon, nitrogen, oxygen, or phosphorus within biological molecules.
The proton count remains the reference for elemental identity when electron number changes and produces an ion. Consequently, a charged atom can still be recognized as the same element rather than a new one. This distinction helps biological analyses separate elemental composition from charge state when considering atoms and molecules in cellular systems.