44,106 research outputs found
ON THE CIRCULAR DICHROISM MEASUREMENTS IN THE 800-600 cm-1 RANGE
No full text P. L. Polavarapu, Appl. Spectrosc, 38, 26 (1984). P. Devlin and P.J. Stephens, Appl. Spectrose. 41, 1142 (1987).Author Institution: Department of Chemistry, Vanderbilt UniversityCircular dichroism measurements in the range were shown to be feasible about five years Some of these earlier results were 'misinterpreted' These differences will be clarified and new results will be presented
Genome-wide identification and transcriptional profiling of small heat shock protein gene family under diverse abiotic stress conditions in Sorghum bicolor (L.)
No full textThe small heat shock proteins (sHsps/Hsp20s) are the molecular chaperones that maintain proper folding, trafficking and disaggregation of proteins under diverse abiotic stress conditions. In the present investigation, a genome-wide scan revealed the presence of a total of 47 sHsps in Sorghum bicolor (SbsHsps), distributed across 10 subfamilies, the major subfamily being P (plastid) group with 17 genes. Chromosomes 1 and 3 appear as the hot spot regions for SbsHsps, and majority of them were found acidic, hydrophilic, unstable and intron less. Interestingly, promoter analysis indicated that they are associated with both biotic and abiotic stresses, as well as plant development. Sorghum sHsps exhibited 15 paralogous and 20 orthologous duplications. Expression analysis of 15 genes selected from different subfamilies showed high transcript levels in roots and leaves implying that they are likely to participate in the developmental processes. SbsHsp genes were highly induced by diverse abiotic stresses inferring their critical role in mediating the environmental stress responses. Gene expression data revealed that SbsHsp-02 is a candidate gene expressed in all the tissues under varied stress conditions tested. Our results contribute to the understanding of the complexity of SbsHsp genes and help to analyse them further for functional validation
VIBRATIONAL CIRCULAR DICHROISM OF TARTARIC ACID ESTERS. CONFIGURATIONAL CORRELATION AND UNIQUE SENSITIVITY TO HYDROGEN BONDING EFFECTS
No full text P. L. Polavarapu, '40th Symposium on Molecular Spectroscopy,' Columbus, OH (1985). Paper WE3 Address of Chandramouly, Ewig and Polavarapu: Department of Chemistry, Vanderbilt University, Nashville, TN 37235Author Institution:Vibrational circular dichroism (VCD) in tartaric acid, dimethyl tartrate, diethyl tartrate and diisopropyl tartrate have been measured in and DMSO solvents. These measurements, which arc in addition to those reported inidicate that the VCD associated with stretching vibrations is identical in all the molecules of the present series. However, VCD associated with the stretching vibration differs from molecule to molecule. These differences are attributed to the well known internal hydrogen bonding and the influence there on from the substituents in COOR group. In order to get a physical picture of the different possible hydrogen bonded conformers, ab initio calculations have been carried out and the minimum energy conformers are identified. The conclusions emerging from these studies point to the extreme sensitivity of VCD, associated with the stretching vibrations, to the nature of internal hydrogen bonding
FOURIER TRANSFORMS INFRARED VIBRATIONAL CIRCULAR DICHROISM OF MATRIX ISOLATED MOLECULES
No full text D. W. Schlosser, F. Devlin, K. Jalkanen and P. J. Stephens, Chem. Phys. Lett. 88,286 (1982). Address of Henderson and Polavarapu: Department of Chemistry, Vanderbilt University, Nashaville, TN 37235Author Institution:Vibrational circular dichroism (VCD) of matrix isolated molecules in the region has been reported by Stephens and coworkers1 using a dispersive VCD instrument. We will discuss the feasibility of VCD measurements of matrix isolated molecules in the region using an FTIR spectrometer. The details of techniques empolyed and the VCD spectra, at resolution of (+)-a-piene in Ar and matrices will be presented
ROTATIONAL OPTICAL ACTIVITY
No full textAddress of Polavarapu: Department of Chemistry, Vanderbilt University, Nashville, TN 37235Author Institution:Optical activity generated by the rotational normal coordinates is investigated. The theoretical formulation is based on classical principles and uses the definition of the rotational normal coordinates and the changes in electric and magnetic dipole moment componenets along that rotational circular dichroism (CD) is supported by chiral asymmetric top molecules whereas rotational Raman optical activity (ROA) is supported by the chiral asymmetric top and as well as symmetric top molecules. For a two group molecule of symmetry, rotations around the two principal axes perpendecular to axis are noted to generate opposite signed CD. Also opposite signed ROA is predicted for these rotations in a two group molecule
Determination of Molecular Absolute Configuration: Guidelines for Selecting a Suitable Chiroptical ApproachComprehensive Chiroptical Spectroscopy
No full textConformational analysis of (S)-(+)-1-bromo-2-methylbutane and the influence of bromine on conformational stability
No full text(S)-(+)-1-bromo-2-methylbutane was investigated using vibrational circular dichroism (VCD). Experimental
absorption and VCD spectra of (+)-1-bromo-2-methylbutane in CDCl3 solution were recorded in the 2000-
900 cm-1 region, and they were compared with the ab initio predictions of absorption and VCD spectra
obtained with density functional theory using the B3LYP/6-31G* basis set for (S)-1-bromo-2-methylbutane.
This comparison indicates that (+)-1-bromo-2-methylbutane is of the (S) configuration and exists in several
conformations. The results obtained for (S)-(+)-1-bromo-2-methylbutane are also compared to those for (S)-
(+)-3-(2-methylbutyl)thiophene, which indicates that the predominant conformations are influenced by the
substitution of bromine with thiophene ring
sj-png-2-dst-10.1177_19322968241239621 – Supplemental material for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin
No full textSupplemental material, sj-png-2-dst-10.1177_19322968241239621 for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin by Elizabeth Miles, Melissa McKnight, Claire C. Schmitz, Chelsea R. McElroy, Jana L. Wardian, Valerie Shostrom and Preethi Polavarapu in Journal of Diabetes Science and Technology</p
sj-png-1-dst-10.1177_19322968241239621 – Supplemental material for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin
No full textSupplemental material, sj-png-1-dst-10.1177_19322968241239621 for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin by Elizabeth Miles, Melissa McKnight, Claire C. Schmitz, Chelsea R. McElroy, Jana L. Wardian, Valerie Shostrom and Preethi Polavarapu in Journal of Diabetes Science and Technology</p
sj-png-8-dst-10.1177_19322968241239621 – Supplemental material for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin
No full textSupplemental material, sj-png-8-dst-10.1177_19322968241239621 for Developing a Diabetes Discharge Order Set for Patients With Diabetes on Insulin by Elizabeth Miles, Melissa McKnight, Claire C. Schmitz, Chelsea R. McElroy, Jana L. Wardian, Valerie Shostrom and Preethi Polavarapu in Journal of Diabetes Science and Technology</p
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