منابع مشابه
How Long can Left and Right Handed Life Forms Coexist?
Reaction-diffusion equations based on a polymerization model are solved to simulate the spreading of hypothetic left and right-handed life forms on the Earth’s surface. The equations exhibit front-like behavior as is familiar from the theory of the spreading of epidemics. It is shown that the relevant time scale for achieving global homochirality is not, however, the time scale of front propaga...
متن کاملCan pulling cause right- to left-handed structural transitions in negatively supercoiled DNA double-helix?
The folding angle distribution of stretched and negatively supercoiled DNA double-helix is investigated based on a previously proposed model of double-stranded biopolymers (H. Zhou et al., Phys. It is shown that pulling can transit a negatively supercoiled DNA double-helix from the right-handed B-form to a left-handed configuration which resembles DNA Z-form in some important respects. The ener...
متن کاملAlzheimer's disease amyloid beta converting left-handed Z-DNA back to right-handed B-form.
Herein we report that Aβ aggregates, not Aβ monomer, can convert Z-DNA back to B-form, and curcumin, a well-known Aβ aggregation inhibitor, can stop DNA Z-B transition studied by means of biophysical and biochemical methods.
متن کاملConversion of Left-Handed Coordinates to Right-Handed Coordinates
2 Left-Handed Coordinate Systems 3 2.1 Heading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Bank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Order of Rotations . . . ...
متن کاملCharacterization of right-handed and left-handed shapes
Many natural shapes are chiral (or handed). Our hands, for example, have a righthand version and a left-hand version, the two types being mirror images of each other. Molecules are also classi ed according to their chirality, which determines their chemical characteristics. Glucose, for example, is sweet only in one chirality, while it is tasteless in the other. The notion of chirality for two ...
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ژورنال
عنوان ژورنال: Nature
سال: 2010
ISSN: 0028-0836,1476-4687
DOI: 10.1038/467789e