NOPR Collection:

Influence of Cellulosic Substrates on Cellulase Production by Chaetomium indicum

1976-06-01T00:00:00Z

Title: Influence of Cellulosic Substrates on Cellulase Production by Chaetomium indicum Authors: Ghosh, B. L.; Bose, R. G. Abstract: The problem of cellulase production by Chaetomium indicum a strong cellulose decomposer has been investigated using a variety of growth substrates. It is inferred that the organism produces cellulose in commensurate proportions when grown on crystalline cellulose freed of any accompanying cellulosans. Page(s): 77-80

Evaluation of Crystallinity in Polyethylene Terephthalate Fibre by X-Ray Diffraction

1976-06-01T00:00:00Z

Title: Evaluation of Crystallinity in Polyethylene Terephthalate Fibre by X-Ray Diffraction Authors: Gupta, V. B.; Kumar, Satish Abstract: Five techniques of determining the crystallinity of polyethylene terephthalate (PET) fibres (due to Farrow and Preston, Hermans and Weidinger, Statton, Bosley, and Dumbleton and Bowles), all based on diffraction study, are evaluated. For this purpose, a large number of samples were prepared from commercial PET yarn by heat-setting and texturized under different conditions. These samples had high crystallite orientation, but widely different structures and morphologies. The crystallinity of these samples was computed using the five procedures. It has been concluded that the absolute crystallinity of a particular sample, as determined by these procedures, may show considerable variations, but a comparison of the relative values of crystallinity for samples belonging to a particular set shows broadly similar trend within the set irrespective of the procedure adopted. This observation highlights the caution necessary in interpreting data on crystallinity of textile fibres as determined by the X-ray diffraction method. Another important conclusion is that the procedures which make use of the total scattering curve appear to result in a parameter which is more closely related to crystallinity than those which are based on intensity at one or two points on the intensity curve. Page(s): 72-76

Crystallite Orientation in Cotton Fibres-A Varietal Study by X-Ray Diffraction Method

1976-06-01T00:00:00Z

Title: Crystallite Orientation in Cotton Fibres-A Varietal Study by X-Ray Diffraction Method Authors: Pai, B. Tara; Panda, B. C. Abstract: The X-ray diffraction technique has been applied to characterize 26 cotton samples on the basis of their crystallite orientation angles, which ranged from a minimum of 28° for Delcerro to a maximum of 43° for Hybrid-4. The orientation angles of these samples were correlated with their tensile strengths, the correlation coefficient working out to -0.520 significant at 0.01 level. To observe the variation of the orientation angles in the inter varietal and interspecific hybrids for investigating their genetic basis, a number of hybrids in the first filial generation were also subjected to X-ray diffraction analysis. Page(s): 67-71

Cotton Fibre Surface Replicas for Electron Microscopy

1976-06-01T00:00:00Z

Title: Cotton Fibre Surface Replicas for Electron Microscopy Authors: Moharir, A. V.; Panda, B. C. Abstract: A rapid and reproducible two-stage carbon replica technique for replicating the surfaces of cotton fibres for electron microscopic observations is described. The technique is suitable for routine characterization of fibres at varietal level to assess their best end use, and for selections by cotton breeders in quality breeding programmes. Page(s): 64-66