Carbon Transition Tracing
Carbon Transition Tracing - Related Videos
02:31
Phase Transitions
0 Views •
2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
02:33
Phase Transitions: Sublimation and Deposition
0 Views •
2020
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
02:58
Properties of Transition Metals
0 Views •
2020
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals. Figure 1: Periodic Table. The transition metals are located in groups 3–11 of the periodic table. The inner transition metals are in the two rows...
01:58
Cooperative Allosteric Transitions
0 Views •
2020
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
07:02
Trace Fear Conditioning in Mice
0 Views •
Cited by 32 •
2014
In the following experiment we describe a protocol for trace fear conditioning in mice. This type of associative memory includes a trace period that separates the neutral stimulus and the unconditioned stimulus.
FAQs
Patterns of 13C incorporation connect an introduced carbon source with metabolites produced later in the biological system. When the label appears in particular downstream compounds, researchers can infer that carbon traveled through associated metabolic routes. Comparing where the label accumulates helps reveal pathway activity and carbon allocation rather than relying only on metabolite abundance.
The stable isotope supplies a traceable carbon signal, while mass spectrometry or nuclear magnetic resonance detects that signal in downstream metabolites. This pairing converts molecular carbon movement into measurable data, allowing researchers to examine pathway activity, substrate use, and biosynthetic relationships in cells, tissues, or microbial communities.
Tracing can show whether carbon from an introduced compound becomes part of later metabolites. That connection helps identify which substrates contribute to particular products and reveals relationships among compounds formed through biological pathways. The resulting information supports analysis of how cells or microbial communities use available carbon and distribute it among metabolic products.
Nutrient availability, physiological stress, and environmental change can alter how organisms process and allocate carbon. By examining labeling patterns under these different conditions, researchers can compare pathway activity and substrate use across biological states. This makes the method useful for studying metabolic responses rather than observing carbon flow under only one fixed condition.
Researchers first introduce a carbon-labeled compound into the biological system under study. They then follow the label as it becomes incorporated into downstream metabolites and analyze those metabolites with mass spectrometry or nuclear magnetic resonance. Interpreting the detected labeling pattern reveals pathway activity, substrate use, biosynthetic connections, or carbon allocation.
The method is useful when researchers need to connect carbon movement with physiology or changing biological conditions. Applications include examining metabolism in cells and tissues, investigating disease mechanisms, studying microbial communities, and evaluating responses to nutrients or stress. At broader scales, the same approach can contribute to understanding carbon cycling in ecosystems.