etd AT Indian Institute of Science: Recent submissions
Now showing items 281-300 of 8144
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Growth and study of certain physical properties of KTiOPO4 single crystals
The crystal growth of KTP (Potassium Titanyl Phosphate) from K?P?O?? solvent has been carried out by spontaneous crystallization as well as the top-seeded solution growth (TSSG) technique. For TSSG, a crystal growth system ... -
Phase separation and dynamics of concentrated colloids : Diffusing wave spectroscopy and brownian dynamics simulations
The purpose of this chapter is to summarize the principal results and conclusions reported in this thesis and also to point out the scope of further work. The focus of this thesis is on static and dynamic aspects of the ... -
Cross polarisation dynamics in solid state nuclear magnetic resonance
In this chapter, Floquet theory was employed to describe the SAP (Selective Averaging Pulse) experiment. Restriction of the CP (Cross Polarization) contact time to part of the rotor period and the application of additional ... -
Low temperature study of electronic transport properties of certain highly resistive crystalline and quasicrystalline alloys
A Low Temperature Study of Electronic Transport Properties of Certain Highly Resistive Crystalline and Quasicrystalline Alloys Low temperature electronic transport in metals and alloys has been and continues to be a topic ... -
Studies on phase transitions in crystals
The present Raman spectroscopic observations of the mixed crystals of ammonium and potassium sulphate in the paraelectric phase show that as the concentrations of K? ions increase in the crystal, the frequency of totally ... -
Studies in terpenns dyhydrogenation studies of abietic acid woth tetrachloro-o-Benzo quinone and a novel route
The thesis entitled "Studies in Terpenes - Dehydrogenation studies of abietic acid with tetrachloro-o-benzoquinone and a novel route to the synthesis of (I) methyl dehydroabietate and (II) methyl 13-methoxydeisopropyldeh ... -
Synthetic investigation in steroids
The thesis entitled “Synthetic Investigations in Steroids” consists of four chapters. Chapter I is a brief review on the total synthesis of aromatic steroids. The problems associated with the development of the total ... -
Studies on black damar
The work embodied in this thesis has been broadly classified into four chapters. Chapter I contains a short introduction to the natural resins and resin oils, briefly summarizing their history and romantic establishment ... -
Studies on synthetic methods
Conversion of amidomethyl function into aldehyde group Amidomethylated aromatic derivatives on treatment with N-bromosuccinimide produced the corresponding aromatic aldehydes in good yields. Attempted introduction of ... -
Supramolecular assemblies of bile acid derivatives
In the early literature, self-associative behaviors of bile acids and bile acid salts were known. Owing to their amphiphilic nature, bile acids can form supramolecular self-assemblies in the form of micelles, helical ... -
In vivo and in vitri biotransformation of terpenoids in rats
Terpenoids are ubiquitous in nature and living systems are exposed to these compounds. Although the metabolism of these compounds in mammals has been studied since the beginning of the century, the exhaustive investigation ... -
Structure andinteractions of polyamines
Polyamines are ubiquitous biological cations. Their high concentration in cells, increase in rapidly growing tissues and the regulatory mechanisms that have evolved for controlling them, point to the importance of polyamines ... -
Conformational studies on peptides containing alpha aminoisobutyric acid and polypeptides with alternating LD-Sequences
The results of semiempirical energy calculations on poly(Aib), varying ACO and ?(NC?C) separately and simultaneously, suggest a novel fourfold helical structure as an energetically favourable model for poly(Aib). This novel ... -
Conformational analysis of cyclic peptides containing Cis peptide units
The dimensions of the cis peptide unit obtained as an average from the three sets of data viz., cyclic di-, higher, and tripeptides are summarized in Table 2.11. On a close examination of the Table, the following salient ... -
Optimal control and differential games in a Hilbert space
In this thesis, we study some aspects of optimal control and differential game problems in an infinite-dimensional Hilbert space. We mainly discuss the dynamic programming and viscosity solution approach to these problems. ... -
RNA granules and DNA damage: Exploring the role of posttranscriptional gene control upon genotoxic stress
Cells constantly encounter genotoxic stress arising from extrinsic environmental factors or intrinsic metabolic byproducts. In response, cells activate a robust DNA damage response (DDR) network to preserve genomic stability. ... -
An investigation of the role of buoyancy in magnetic polarity transitions in rapidly rotating dynamos
The dynamo operating within the Earth’s outer core generates a predominantly north-south dipolar magnetic field. Occasionally, the magnetic dipole axis flips its orientation and retains its approximate alignment with the ...