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Biomedical subjects

P Raghunathan

Publications and source records attributed to P Raghunathan.

22 records · Page 2Linked to original sources
PubMed1995

Proton MRS similarity between central nervous system non-Hodgkin lymphoma and intracranial tuberculoma.

Proton magnetic resonance spectroscopy (MRS) was carried out on a patient with histologically proven non-Hodgkin lymphoma (NHL) of the central nervous system (CNS). The observation of the presence of a huge resonance in the region between 0.5-1.5 ppm and the absence of any other signals is not in agreement with those published for NHL in the literature but has a striking similarity to that reported for an intracranial tuberculoma.

Brain Neoplasms↗
PubMed1995

In vivo magnetic resonance study of the histochemistry of coconut (Cocos nucifera).

Magnetic resonance imaging (MRI) and localized proton MR spectroscopy (MRS) techniques have been applied for studying different maturation processes in the histochemistry of coconut (Cocos nucifera). Images of the tender and mature coconut are characterized by protons of the aqueous solution present in the cavity and from the surrounding pulp, whereas the image of the dry coconut is from the protons of the fat present in the pulp. Localized proton MR spectra of the water present in the cavity from the tender and the mature coconut show several resonances due to different chemical constituents of coconut water, whereas typical spectra of the pulp from dry coconut reveal a profile of the hydrogens present in the saturated and unsaturated fatty acid chains. In addition, images obtained from a rancid coconut show the extent of internal damage and degradation due to fungal growth; the corresponding localized MR spectra of the coconut water reveal that several proton resonances are absent.

Cocos↗
PubMed1986

Spectroscopic investigations of the water pool in lecithin reverse micelles.

The nature of the water pool formed in the reverse micellar system, lecithin/nonpolar solvent/water, has been investigated by means of near infrared, ultraviolet, fluorescence emission and visible spectroscopic techniques. The three nonpolar solvents chosen in this study were benzene, carbon tetrachloride and cyclohexane. Near infrared spectroscopic studies revealed that the amount of water present in the bulk organic phase is negligible at all water concentrations studied in all three solvents. The results of the polarity probe and 8-anilinonaphthalene sulfonic acid (ANSA) fluorescence emission maxima studies indicate that the polarity of the water pool is much lower than that of bulk water. The difference in polarity between the water pool and bulk water decreases with increasing water concentration in benzene and carbon tetrachloride systems. However, in the cyclohexane system, at a water content of 6 moles of water per mole of lecithin, where the system is known to change from isotropic reverse micelle to anisotropic liquid crystalline state, the polarity of the water pool is found to decrease.

Anilino Naphthalenesulfonates↗