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Keloids tend to have a genetic component, which means one is more likely to have keloids if one or both of their parents has them. However, no single gene has yet been identified which is a causing factor in keloid scarring but several susceptibility loci have been discovered, most notably in Chromosome 15.
Although most compounds are referred to by their IUPAC systematic names (following IUPAC nomenclature), ...
A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Some definitions specify that the particles must be dispersed in a liquid, [1] while others extend the definition to include substances like aerosols and gels.
While the two terms are often used interchangeably, according to ISO nanotechnology definitions, an agglomerate is a reversible collection of particles weakly bound, for example by van der Waals forces or physical entanglement, whereas an aggregate is composed of irreversibly bonded or fused particles, for example through covalent bonds. [6]
In bees, for example, two alarm pheromone mixtures are known. One is released by the Koshevnikov gland near the sting and contains more than 40 different compounds, such as isoamyl acetate, already described by Butler in its effect, besides butyl acetate, 1-Hexanol, 1-Butanol, 1-Octanol, hexyl acetate, octyl acetate and 2-Nonanol.
The overlap between the diffuse layers of two approaching particles results in a repulsive double layer interaction potential, which leads to particle stabilization. When salt is added to the suspension, the electrical double layer repulsion is screened, and van der Waals attraction become dominant and induce fast aggregation.
The first-order Raman spectra of kerogen comprises two principal peaks; [15] a so-called G band ("graphitic") attributed to in-plane vibrational modes of well-ordered sp 2 carbon and a so-called D band ("disordered") from symmetric vibrational modes of sp 2 carbon associated with lattice defects and discontinuities.
Just like how two adjacent p-orbitals in a molecule will form a pi-bond, three or more adjacent p-orbitals in a molecule can form a conjugated pi-system. In a conjugated pi-system, electrons are able to capture certain photons as the electrons resonate along a certain distance of p-orbitals - similar to how a radio antenna detects photons along ...