The levels of cyclic GMP and glucose 1,6-diphosphate,and the activity of phosphofructokinase,in muscle from normal and dystrophic mice

A striking reduction in the levels of glucose 1,6-diphosphate and an increase in cyclic GMP were found in muscle from dystrophic mice. Concomitant to these changes, the allosteric activity of phosphofructokinase was found to be markedly reduced. These findings could offer an explanation for the observed reduction in glycolysis in the dystrophic muscle.     

Heterogeneity in the physicochemical properties of deoxycholate-solubilized benzodiazepine receptors from calf cerebral cortex

The hydrodynamic behaviour of benzodiazepine receptors solubilized by deoxycholate from calf cerebral cortex reveals two molecular forms. The Stokes radii are 46.5 A and 67.2 A, and the sedimentation coefficients are 10.9 S and 14.6 S. The calculated apparent molecular weights and frictional ratios suggest either two nearly globular proteins of ca. 200K and 400K daltons each, or two ca. 300K daltons proteins which differ significantly in their degree of asymmetry. The benzodiazepine binding site is located on ca. 51K daltons component(s) in both forms.     

STRUCTURAL DIMORPHISM OF STIGMATIC PAPILLAE IN DISTYLOUS LINUM SPECIES

Intermorph differences in the wall structure and constituents of stigmatic papillae are described for distylous Linum pubescens and L. grandiflorum. In the long-styled morph of both species the wall portion around the apex of the papilla has a thickened cellulose-pectin layer. In the short-styled morph of L. pubescens a cap zone is interposed between the cuticle and apical portion of the papilla wall. The subcuticular cap space contains pectins and lipid particles. Similar particles are also present in deposits on the cuticle surface. Papillae of the short-styled morph in L. grandiflorum lack a cap zone and have only epicuticular lipid deposits. Other distylous Linum species in which the two morphs differ in wall structure of the papillae are L. mucronatum, L. flavum, L. perenne, L. austriacum, and L. maritimum. Studies of stigma dimorphism can help to elucidate evolutionary relations between dimorphic and monomorphic Linum species.