Spectral characteristics of signals in the optical Hanle effect

The results of an earlier investigation by the authors Phys. Rev. A 23 2553 (1981) are extended to study the spectral features of the signals in the optical Hanle effect with regard to the various directions of observations and the polarizations of the emitted and the exciting radiation. The asymmetries in the spectra are found to be critically dependent on each of these parameters

Fragment Finder: a web-based software to identify similar three-dimensional structural motif

FF (Fragment Finder) is a web-based interactive search engine developed to retrieve the user-desired similar 3D structural fragments from the selected subset of 25 or 90% non-homologous protein chains. The search is based on the comparison of the main chain backbone conformational angles (φ and ϕ). Additionally, the queried motifs can be superimposed to find out how similar the structural fragments are, so that the information can be effectively used in molecular modeling. The engine has facilities to view the resultant superposed or individual 3D structure(s) on the client machine. The proposed web server is made freely accessible at the following URL: or

3dSS: 3D structural superposition

3dSS is a web-based interactive computing server, primarily designed to aid researchers, to superpose two or several 3D protein structures. In addition, the server can be effectively used to find the invariant and common water molecules present in the superposed homologous protein structures. The molecular visualization tool RASMOL is interfaced with the server to visualize the superposed 3D structures with the water molecules (invariant or common) in the client machine. Furthermore, an option is provided to save the superposed 3D atomic coordinates in the client machine. To perform the above, users need to enter Protein Data Bank (PDB)-id(s) or upload the atomic coordinates in PDB format. This server uses a locally maintained PDB anonymous FTP server that is being updated weekly. This program can be accessed through our Bioinformatics web server at the URL or

Protein Geometry Database: a flexible engine to explore backbone conformations and their relationships to covalent geometry

The backbone bond lengths, bond angles, and planarity of a protein are influenced by the backbone conformation (φ,Ψ), but no tool exists to explore these relationships, leaving this area as a reservoir of untapped information about protein structure and function. The Protein Geometry Database (PGD) enables biologists to easily and flexibly query information about the conformation alone, the backbone geometry alone, and the relationships between them. The capabilities the PGD provides are valuable for assessing the uniqueness of observed conformational or geometric features in protein structure as well as discovering novel features and principles of protein structure. The PGD server is available at http://pgd.science.oregonstate.edu/ and the data and code underlying it are freely available to use and extend

Synthesis and characterization of oxovanadium(IV), chromium(III), manganese(II), iron(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes of a new neutral ambidentate nitrogen donor

843-846A few complexes of VO(II), Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes with 2,3-dihydrazino quinoxaline(DHQ) have been synthesized and characte<span style="font-size:12.0pt; font-family:" times="" new="" roman","serif";mso-fareast-font-family:hiddenhorzocr;="" color:#111111;mso-ansi-language:en-in;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="">rized by analytical, conductance, thermal, spectral and magnetic data. All the complexes are non-electrolytes. The ligand behaves as bis-NN donor in all the complexes, coordinating through the ring azomethine nitrogen and nitrogen of terminal NH2. The ESR spectrum of  <span style="font-size:12.0pt; font-family:" times="" new="" roman","serif";mso-

CADB: Conformation Angles DataBase of proteins

Conformation Angles DataBase (CADB) provides an online resource to access data on conformation angles (both main-chain and side-chain) of protein structures in two data sets corresponding to 25% and 90% sequence identity between any two proteins, available in the Protein Data Bank. In addition, the database contains the necessary crystallographic parameters. The package has several flexible options and display facilities to visualize the main-chain and side-chain conformation angles for a particular amino acid residue. The package can also be used to study the interrelationship between the main-chain and side-chain conformation angles. A web based JAVA graphics interface has been deployed to display the user interested information on the client machine. The database is being updated at regular intervals and can be accessed over the World Wide Web interface at the following URL: http://144.16.71.148/cadb/

Collision enhanced resonance of laser diode excited Cs in buffer gas

We report an experimental investigation of the Cs D2 line-shape changes due to laser-induced optical pumping and collisions in a buffer gas. A model dealing with the population of the ground-state hyperfine levels, the pressure broadening in the presence of Ne, and the diffusion of the atoms outside the laser beam describes well the complex line shapes

Thermal behaviour of glycidyl methacrylate homopolymers and copolymers

The paper describes the effect of molecular mass and copolymer composition on thermal behaviour of homopolymers and copolymers of glycidyl methacrylate and methyl methacrylate. The polymerisation was done by using group transfer polymerization (GTP) and free radical techniques. A multistep decomposition was observed in polymers prepared by free radical technique indicating the presence of weak linkages in the backbone. Copolymers prepared by GTP had fewer weak sites and degraded in single step by a random chain scission