Not primitive

Why this is so cannot be explained. Egually inexplicable is the trend towards the more-complex structures and systems observed in evolution. Even if we conclude from this that life in its beginning had to be relatively simple, it was still not primitive. Manfred Eigen (Nobel Prize 1967) in particular pointed out that one property of matter must have played a decisive role the ability to self-assemble. From there he postulated that "Life comes into existence when the conditions for it are suitable". Could a different life have come into existence had the conditions been different We don t know. Instead, we know a lot about life that we can observe and investigate. 

Although such a cell is not primitive, it is easier to visualize and facilitates direct comparison with hexagonal structures. 

If all the lattice points are positioned in the eight corners of a unit cell, then the unit cell is called a primitive unit cell. However, often, for convenience, larger unit cells, which are not primitives, are selected for the description of a particular lattice, as will be explained later. 

Reduces the resultant unit cell by using the Delaunay-Ito method and then transforms it into one of the 14 Bravais lattices if the lattice is not primitive. 

If the angles a, and y are all different from 90° and from each other the crystal is said to be triclinic. The only simplification that may be possible in describing the structure is to find another set of parallelepipeds with angles closer to 90° that still describe the structure. For certain special values of a, and Y and special relationships among a, b and c it is possible to find other descriptions of the lattice that conform to the symmetry of the structure. A particular example is the face-centred cubic lattice, illustrated in fig. 2.6, in which the cube of edge a clearly exhibits the full symmetry of the structure, but the rhombohedron of edges a/ /2 does not. This parallelepiped is one of the infinite number of possible types of primitive unit cell that can be chosen so as to contain only one lattice point per cell. The cubic unit cell is not primitive there are four lattice points per cubic cell. Care must be taken when describing diffraction from non-primitive cells, which can occur both for polymeric and for non-polymeric crystals. 

Bravais lattice is primitive If it contains only one atom, it is primitive if it contains more, it is not. While counting the atoms it has to be kept in mind to count only the appropriate fractions of those atoms occupying more than one cell. For instance, the conventional unit cell of the body-centred cubic lattice contains two atoms and is therefore not primitive, the conventional unit ceU of the face-centred cubic lattice contains four atoms and is thus not primitive either. 

For most of man s history engineering has been carried out in an unutterably different other way from how it is achieved in the present. Studying this otherness, one sees it to be not primitive but rather complete-in-itself and timeless. In parallel with a different literary consciousness, there was a relationship with nature alien to our own, so is this still with us to be activated or drawn upon in different ways ... 

For the cubic phase the SANS experiment shows stUl the same type of aggregates hut more concentrated. However, here the packing exceeds the critical volume fraction of 53 vol%, which is typical for a hard sphere crystallization [63, 64]. In the cubic phase the spherical aggregates are packed similar to metal atoms in a cubic lattice. From SANS investigations of samples in the cubic phase it seems that the packing is not primitive cubic but either face-centred cubic (fee) or body-centred cubic (bcc). Between these two possibilities an experimental distinction was not feasible [65]. 

The close similarity of the lanthanide distributions in ocean floor volcanics to that of the chondrites is further evidence that Earth has the same overall average relative lanthanide abundances as the chondrites. Otherwise, the uniformity of these melt products of the mantle found in all the oceans of the world would seem to be fortuitous. The distribution is not unmodified from that of the chondrites, and the lavas are not primitive or first-generation melting products of a primitive terrestrial mantle. Variations in lanthanide concentrations and relative abundances among ocean floor basalts are mainly the result of minor inhomogeneities in the mantle source regions, small differences in conditions of partial melting, and crystal fractionation of the lavas prior to eruption. 

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