Search results
Results from the WOW.Com Content Network
A chiral phenomenon is one that is not identical to its mirror image (see the article on mathematical chirality).The spin of a particle may be used to define a handedness, or helicity, for that particle, which, in the case of a massless particle, is the same as chirality.
In particular for a massless particle the helicity is the same as the chirality while for an antiparticle they have opposite sign. The handedness in both chirality and helicity relate to the rotation of a particle while it proceeds in linear motion with reference to the human hands. The thumb of the hand points towards the direction of linear ...
Knipholone, with its axial chirality, occurs in nature and has been shown to offer good antimalarial and antitumor activities particularly in the M form. [ 1 ] The use of atropisomeric drugs provides an additional way for drugs to have stereochemical variations and specificity in design. [ 22 ]
By contrast, for massive particles, distinct chirality states (e.g., as occur in the weak interaction charges) have both positive and negative helicity components, in ratios proportional to the mass of the particle. A treatment of the helicity of gravitational waves can be found in Weinberg. [4]
Homochirality is a uniformity of chirality, or handedness.Objects are chiral when they cannot be superposed on their mirror images. For example, the left and right hands of a human are approximately mirror images of each other but are not their own mirror images, so they are chiral.
Chirality with hands and two enantiomers of a generic amino acid The direction of current flow and induced magnetic flux follow a "handness" relationship. The term chiral / ˈ k aɪ r əl / describes an object, especially a molecule, which has or produces a non-superposable mirror image of itself.
Helicity (particle physics), the projection of the spin onto the direction of momentum; Magnetic helicity, the extent to which a magnetic field "wraps around itself" Circular dichroism, the differential absorption of left and right circularly polarized light; A form of axial chirality; A former name for inherent chirality
The quantity is the spatial density of optical chirality, while is the optical chirality flux. [2] Generalizing the aforementioned differential conservation law for Z 0 {\displaystyle Z^{0}} , Lipkin found other nine conservation laws, all unrelated to the stress–energy tensor .