Heats of Dilution

Meiotic recombination heats up.

Meiotic recombination is essential for the production of viable haploid gametes in sexually-reproducing organisms, and creates new allelic combinations, whichmay facilitate evolution by natural selection and genetic drift (Barton & Charlesworth, 1998). Crossovers between homologous chromosomes establish physical connections (chiasmata) which enable proper chromosome segregation. In the absence ...

Heats of Hydration and Absolute Heats of Formation of Aqueous Ions

Accurate calculations are made for the hydration energies of the alkali halides, using the most recent data. These results, and the average of theoretical calculations made by others for the individual ions, are used to determine the most probable hydration energy of the individual ions. These in turn are the basis for calculating the absolute enthalpy of formation of aqueous H: 98.6 kcal/g-equ...

Heats of combustion and formation of cyclopropane.

On the Heats of Formation of Alkanes1

A broad diverse test set of alkanes and cycloalkanes previously studied with MM4 calculations has had the heats of formation calculated by several different quantum mechanical methods: HartreeFock, MP2, and MP4, and also by B3LYP and B3LYP + dispersion energy. Overall, three computational methods (MM4, MP4, and B3LYP + dispersion) yield results that are generally of experimental accuracy. These...

Climate-change battle heats up

Concerns over climate change ratcheted up a notch last month with new fears that the pace of change had been greater than anyone predicted a decade ago, and that major tourist and nature sites could be out of bounds or threatened within coming years. And America’s most populous state, California, opened a new front in its struggle with climate change when it announced it was suing the six large...