Anisoceratid shells begin as an irregular helical spiral which typically becomes confined to a single plane with growth.
2.
In three dimensions, a regular skew apeirogon traces out a helical spiral and may be either left-or right-handed.
3.
The shell forms a loose open helical spiral in the early stages, ending in one or two straight shafts in the mature adult.
4.
Accompanying this shrinkage of brain volume is a shrinking of the occipital area of the head, with the cuticle folding into helical spirals.
5.
CHS scientists reportedly conceptualized a spatio-temporal indexing system during a hydrographic survey onboard CCGS " Hudson " on Georges Bank during the summer of 1989 . The indexing system involved an adaptation of a Riemannian hypercube data structure, invoking a helical spiral through 3-dimensional space, which allowed for n-size of features.
6.
Its appearance is in sharp contrast to the typically rectangular Manhattan buildings that surround it, a fact relished by Wright, who claimed that his museum would make the nearby Metropolitan Museum of Art " look like a Protestant barn . " Internally, the viewing gallery forms a helical spiral ramp climbing gently from ground level to the skylight at the top.
7.
A joint development team of CHS and Oracle personnel subsequently redesigned the Oracle kernel, resulting in the " Spatial Data Option " or " SDO " for Oracle 7 . ( The SDO _ prefix continues in use within Oracle Spatial implementations . ) The spatial indexing system for SDO involved an adaptation of Riemannian hypercube data-structures, invoking a helical spiral through 3-dimensional space, which allows n-size of features.
8.
In order to give the right radius for helical spirals while preserving smooth ?-strands, the splines can be modified by offsets proportional to local curvature, as first developed by Mike Carson for his Ribbons program ( figure at right ) and later adapted by other molecular graphics software, such as the open-source Mage program for kinemage graphics that produced the ribbon image at top right ( other examples : 1xk8 trimer and DNA polymerase ).
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