A new crystalline form of polyoxymethylene is described with an orthorhombic unit cell, space group P212121, and lattice constants a = 4.77 A., b = 7.65 A., c = 3.56 A. The chains are helicoidal with the axis of the helix parallel to c. The period of identity of 3.56 A. comprises two monomeric units and one turn of the helix. The lattice of orthorhombic polyoxymethylene is made up of isomorphous helicoidal chains.
The intracytoplasmic origin of the flagella in Ettglem gracilis is described with particular regard to the transitional zone. Our observations are compared with those reported for Enfosiphon.The structure of the paraflagellar body has been studied by diphractometric analysis. The PFB of Euglena may be described as a crystal with a monoclinic or slightly distorted hexagonal unit cell with dimensions: a = 8.9nm; b = 7.7 nm; c = 8.3 nm; p = 110".
ACKNO\VLEDGhlENTSThe authors wish to think Prof.
Chicken hver basic fatty acid-binding protein @I=9.0) has been purified with a high yield by a modification of a method originally applied to rat liver. The final product is highly homogeneous and can be used to grow crystals that belong to two different space groups. The crystals are either tetragonal, space group Pq2,2 with a= b=60.2 8, and c= 138.1 A or orthorhombic, space group P2,2,2, with a = 60.7 A, b = 40.1 A and c = 66.7 A. The second form appears to be more suitable for X-ray diffraction studies, it diffracts to at least 2.8 A resolution and it is believed to contain one protein molecule in the crystallographic asymmetric unit.Fatty acid-binding protein; Crystal growth; X-ray diffraction; (Chicken liver)
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