Search results
Results From The WOW.Com Content Network
In biology, polymorphism [1] is the occurrence of two or more clearly different morphs or forms, also referred to as alternative phenotypes, in the population of a species. To be classified as such, morphs must occupy the same habitat at the same time and belong to a panmictic population (one with random mating).
Phase transitions (phase changes) that help describe polymorphism include polymorphic transitions as well as melting and vaporization transitions. According to IUPAC, a polymorphic transition is "A reversible transition of a solid crystalline phase at a certain temperature and pressure (the inversion point) to another phase of the same chemical composition with a different crystal structure."
There is, for example, a polymorph-ratio cline in D. robusta along an 18-mile (29 km) transect near Gatlinburg, TN passing from 1,000 feet (300 m) to 4,000 feet. [55] Also, the same areas sampled at different times of year yielded significant differences in the proportions of forms.
Language links are at the top of the page across from the title.
Polymorphisms can be identified in the laboratory using a variety of methods. Many methods employ PCR to amplify the sequence of a gene. Once amplified, polymorphisms and mutations in the sequence can be detected by DNA sequencing, either directly or after screening for variation with a method such as single strand conformation polymorphism analysis.
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
The initial polymorph is in a metastable state (1), which requires overcoming an energy threshold (2) to make it transform into a more stable polymorph with a stronger bond (3). Once (3) exists in a solution during nucleation, the resulting crystal will take the form of the more stable polymorph, making (1) nearly impossible to produce in a ...
Polymorphism (computer science), the ability in programming to present the same programming interface for differing underlying forms Ad hoc polymorphism, applying polymorphic functions to arguments of different types