Examples of density in the following topics:
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- Population regulation is a density-dependent process, meaning that population growth rates are regulated by the density of a population.
- In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population.
- In addition, low prey density increases the mortality of its predator because it has more difficulty locating its food source.
- Its chances of survival are the same whether the population density is high or low.
- In this population of roundworms, fecundity (number of eggs) decreases with population density.
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- Its density is the number of individuals within a given area or volume.
- Individuals in a low-density population are thinly dispersed; hence, they may have more difficulty finding a mate compared to individuals in a higher-density population.
- On the other hand, high-density populations often result in increased competition for food.
- Many factors influence density, but, as a rule-of-thumb, smaller organisms have higher population densities than do larger organisms .
- Scientist uses a quadrat to measure plant population size and density
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- Humans have exceeded density-dependent limits on population by enacting various environmental changes to accommodate our needs for hygiene, shelter, and food.
- This capability is an underlying reason for human population growth as humans are able to overcome density-dependent limits on population growth, in contrast with all other organisms.
- Describe ways in which humans overcome density-dependent regulation of population size
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- Density and size are useful measures for characterizing populations.
- In this way, the dispersion pattern of the individuals within a population provides more information about how they interact with each other and their environment than does a simple density measurement.
- Just as lower density species might have more difficulty finding a mate, solitary species with a random distribution might have a similar difficulty when compared to social species clumped together in groups.
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- Water's lower density in its solid form is due to the way hydrogen bonds are oriented as it freezes: the water molecules are pushed farther apart compared to liquid water.
- With most other liquids, solidification when the temperature drops includes the lowering of kinetic energy between molecules, allowing them to pack even more tightly than in liquid form and giving the solid a greater density than the liquid.
- The low density of ice , an anomaly, causes it to float at the surface of liquid water, such as an iceberg or the ice cubes in a glass of water.
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- The DNA was centrifuged at high speeds in an ultracentrifuge in a tube in which a cesium chloride density gradient had been established.
- In the ultracentrifuge tube, the cesium chloride salt created a density gradient, with the cesium chloride solution being more dense the farther down the tube you went.
- By looking at the relative positions of bands of molecules run in the same gradients, you can determine the relative densities of different molecules.
- The molecules that form the lowest bands have the highest densities.
- So DNA grown in 15N had a higher density, as would be expected of a molecule with a heavier isotope of nitrogen incorporated into its nitrogenous bases.
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- The relative density of pressure receptors in different locations on the body can be demonstrated experimentally using a two-point discrimination test.
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- When the population density of the bacteria reached a certain level, specific gene expression was initiated: the bacteria produced bioluminescent proteins that emitted light.
- Because the number of cells present in the environment (the cell density) is the determining factor for signaling, bacterial signaling was named quorum sensing.
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- (b) If the container is sealed, evaporation will continue until there is enough vapor density for the condensation rate to equal the evaporation rate.
- This vapor density and the partial pressure it creates are the saturation values.
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- Solvent density: As the density of a solvent increases, the rate of diffusion decreases.
- Because cells primarily use diffusion to move materials within the cytoplasm, any increase in the cytoplasm's density will inhibit the movement of the materials.