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Acentric (other)
Acentric may refer to: * Acentric factor The acentric factor is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids. It has become a standard for the phase characterization of single and pure components, along with other state desc ..., in thermodynamics, the measure of the non-sphericity (acentricity) of molecules * Acentric chromosome, in genetics, a chromosome without centromere * Acentric fragment, in genetics, a chromosome segment lacking a centromere See also * Eccentricity (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acentric Factor
The acentric factor is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be useful in the description of fluids. It has become a standard for the phase characterization of single and pure components, along with other state description parameters such as molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility). The acentric factor is also said to be a measure of the non-sphericity (centricity) of molecules. Pitzer defined from the relationship : \omega = -\log_(p^\text_\text) - 1 \text T_\text = 0.7, where p^\text_\text = p^\text / p_c is the reduced saturation vapor pressure, and T_\text = T / T_c is the reduced temperature. Pitzer developed this factor by studying the vapor-pressure curves of various pure substances. Thermodynamically, the vapor-pressure curve for pure components can be mathematically described using the Clausius–Clapeyron equation. The integrated form of equation is mainly used fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acentric Chromosome
An acentric fragment is a segment of a chromosome that lacks a centromere. Because the centromere is the point of attachment for the mitotic apparatus, acentric fragments are not evenly distributed to the daughter cells in cell division (mitosis and meiosis). As a result, one of the daughters will lack the acentric fragment. Lack of the acentric fragment in one of the daughter cells may have deleterious consequences, depending on the function of the DNA in this region of the chromosome. In the case of a haploid organism or a gamete, it will be fatal to one of the daughter cells if essential DNA is contained in the lost DNA segment. In the case of a diploid organism, the daughter cell lacking the acentric fragment will show expression of any recessive genes found in the homologous chromosome. Developmental geneticists look for cells and cell lineages lacking unpaired chromosome segments produced this way as a means of identifying essential genes for specific functions. Acen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |