2,092 research outputs found
Natural Pigments-Based Two-Component White Light Emitting Systems
No full textIn this paper, a new class of two component white light emitting systems viz, JaB (java plum + beetroot) {I}, and CaB (carrot + beetroot) {II} were developed through resonance energy transfer (RET) phenomenon by using a fruit (java plum) and two vegetable (carrot and beetroot) extracts. In these white light emitting systems, java plum and carrot are the donors while beetroot is the acceptor. The primary fluorescent pigments present in the natural extracts (i.e., anthocyanin in java plum, β-carotene in carrot, and betanin in beetroot) were responsible for the white light emission. The CIE (Commission Internationale d’Eclairage) coordinates for I and II were {0.32, 0.34} and {0.33, 0.33}, respectively, in solution phase. Interestingly, the white light emission (WLE) was also achieved in agar-agar gel medium. In gel medium, the CIE values were {0.31, 0.34} and {0.33, 0.32} for I and II, respectively. The donor-acceptor distance (r) for I and II were found to be 0.5 and 0.4 nm, respectively. Furthermore, the rate of energy transfer was also quantified with the values of 2.78 × 109 s−1 for JaB (I) and 1.02 × 108 s−1 for CaB (II) systems. The mechanistic investigation of the two white light systems was further supported by DFT studies. Graphical Abstract: (Figure presented.)No Full Tex
Temperature-dependence of self- and air-broadened CO line shapes in the fundamental band
No full textMade available in DSpace on 2019-07-15T22:17:05Z (GMT). No. of bitstreams: 2
4122.pdf: 20796 bytes, checksum: ad06c4b50ff683bc8efc7557d9235638 (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
Previous issue date: 2019-06-21Made available in DSpace on 2020-01-25T19:30:57Z (GMT). No. of bitstreams: 4
4122.pdf.txt: 2221 bytes, checksum: 24582f789725b45b7ef6f7da3ea24083 (MD5)
license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5)
4122.pdf: 20796 bytes, checksum: ad06c4b50ff683bc8efc7557d9235638 (MD5)
1512774.pptx: 3340003 bytes, checksum: 391e7d705083712360813a3fdd311e9b (MD5)
Previous issue date: 2019-06-21"We present results of an extensive analysis of the CO 10 band in 40 spectra of pure carbon monoxide and carbon monoxide mixed with air recorded at temperatures ranging between 79 K and room temperature. All spectra were recorded using the 1-m McMath-Pierce Fourier Transform spectrometer located at Kitt Peak, AZ, USA and two temperature-controlled gas cells.
The analysis was carried out using multispectrum fitting software\footnote{D.~C.~Benner,
C.~P.~Rinsland, V.~Malathy Devi, M.~A.~H.~Smith and
D.~A.~Atkins, \textit{JQSRT} \underline{\textbf{53}} (1995) 705-721.} and the Voigt, speed-dependent Voigt and Rautian line shape models. When using the Rautian model, we employed calculated narrowing parameters obtained from computed diffusion constants\footnote{J.~O.~Hirschfelder, C.~F.~Curtiss and R.~B.~Bird, \underline{Molecular theory of gases and liquids}, New York, Wiley and Sons, 1952.} for each of the absorber-perturber pairs CO-CO, CO-N and CO-O.
The experimentally retrieved temperature dependences of the line shape parameters are been compared with previous published results and with the results of calculations for CO-N.
We thank D.~Chris Benner for the Labfit software. The work of V.~M.~Devi was funded by NASA grants and contracts, and the research by M.~A.~H.~Smith was performed as part of her former employment at NASA Langley Research Center. No official endorsements are intended or implied. N.~Islam and A.~Predoi-Cross have been funded by NSERC. S.~Ivanov received financial support from the Ministry of Science and Higher Education within the State assignment FSRC ""Crystallography and Photonics"" RAS and Russian Science Foundation (Project No.18-55-16006).
Line Positions And Intensities For The Ν12 Band Of 13c12ch6
No full textHigh-resolution, high signal-to-noise spectra of
mono-substituted C-ethane (CCH) in the 12.2 m region
were recorded with a Bruker IFS 125HR Fourier transform spectrometer. The spectra were
obtained for four sample pressures at three different temperatures between 130 and 208 K
using a 99 C-enriched ethane sample
contained in a 20.38-cm long coolable absorption cell\footnote{K.~Sung, A.~W.~Mantz,
L.~R.~Brown, \textit{et al.}, \textit{J. Mol. Spectrosc.}
\underline{\textbf{162}} (2010) 124-134.}. A multispectrum nonlinear least squares
fitting technique\footnote{D.~C.~Benner,
C.~P.~Rinsland, V.~Malathy Devi, M.~A.~H.~Smith and
D.~Atkins, \textit{JQSRT} \underline{\textbf{53}} (1995) 705-721.} was used to
fit the same intervals in the four
spectra simultaneously to determine line positions and intensities. Similar to our previous
analyses of CH spectra in this same region\footnote{V.~Malathy Devi,
C.~P.~Rinsland, D.~Chris Benner, \textit{et al.}, \textit{JQSRT} \underline{\textbf{111}}
(2010) 1234-1251; V.~Malathy Devi, D.~Chris Benner, C.~P.~Rinsland, \textit{et al.},
\textit{JQSRT} \underline{\textbf{111}} (2010) 2481-2504.}, constraints were applied
to accurately fit each pair of doublet components arising from torsional Coriolis interaction
of the excited state with the nearby torsional state. Line intensities
corresponding to each spectrum temperature (130 K, 178 K and 208 K) are reported
for 1660 absorption lines for which the assignments are known, and integrated
intensities are estimated as the summation of the measured values. The measured line positions
and intensities (re-scaled to 296 K) are compared with values in recent editions of
spectroscopic databases.\footnote{Research described
in this paper was performed at Connecticut College, the College of William and Mary,
NASA Langley Research Center and the Jet Propulsion Laboratory, California
Institute of Technology, under contracts and cooperative agreements with the National
Aeronautics and Space Administration.}Made available in DSpace on 2014-09-17T16:55:05Z (GMT). No. of bitstreams: 3
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
174.pdf: 22920 bytes, checksum: 9a8da9d5a4438fe15a60a28dc2a888b9 (MD5)
abstract.txt: 2403 bytes, checksum: 9196879d438660f346ca235393785104 (MD5)
Previous issue date: 2014-06-20Made available in DSpace on 2015-04-14T18:40:36Z (GMT). No. of bitstreams: 4
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
FE08_Presentation.pptx: 3658475 bytes, checksum: ffc1c3b2f0fd76947f354c5cfabf841f (MD5)
FE08_Abstract.pdf: 22920 bytes, checksum: 9a8da9d5a4438fe15a60a28dc2a888b9 (MD5)
FE08_Abstract.txt: 2403 bytes, checksum: 9196879d438660f346ca235393785104 (MD5)
Previous issue date: 2014-06-2
Salvia Species: Biotechnological Strategies Applied to In Vitro Cultures for the Controlled Production of Bioactive Diterpenoids
No full textPlant secondary metabolites have great applications in the nutritional and cosmetic aspects of human health. Terpenes, and in particular bioactive diterpenoids, represent an important group of compounds found in Salvia species. Their production in plants is often limited, and chemical synthesis is often not economically feasible. Biotechnological approaches using plant cell and tissue cultures can be routinely established under sterile conditions from explants for biomass production and the extraction of secondary metabolites. The biosynthesis and accumulation of bioactive diterpenoids in vitro in Salvia cells and tissues can be enhanced by strain improvement, techniques to select high-producing cell lines, optimisation of the growth medium, use of specific precursors or elicitors, induction of their release into the culture medium, and the overexpression of genes. This review analyses the biotechnological techniques applied to the in vitro culture of Salvia cells and tissues to enhance the production and accumulation of bioactive diterpenoids and summarises their biological activities
SELF- AND CO2-BROADENED LINE SHAPE PARAMETERS FOR THE _2 AND _3 BANDS OF HDO
No full textKnowledge of CO-broadened HDO widths and their temperature dependence exponents are required to interpret atmospheric spectra of Mars and Venus. We therefore used nine high-resolution, high signal-to-noise spectra of HDO and HDO+CO mixtures to obtain broadening coefficients for selected transitions of the and vibrational bands located at 7.13 and 2.70 , respectively. The gas samples were prepared by mixing equal amounts of high-purity distilled HO and a 99% enriched DO sample. Spectra at different temperatures (255-296 K) were obtained using a 20.38 cm long coolable cellfootnote{K. Sung, A.W. Mantz, M.A.H. Smith, L.R. Brown, T.J. Crawford, V.M. Devi, D.C. Benner. J. Mol. Spectrosc. 162 (2010) 124-134.} installed in the sample compartment of the Bruker 125HR Fourier transform spectrometer at the Jet Propulsion Laboratory, in Pasadena, CA. The retrieved parameters included accurate line positions, intensities, self- and CO-broadened half-width and pressure-shift coefficients and the temperature dependences of CO broadened HDO. The spectroscopic parameters for many transitions were obtained simultaneously by multispectrum fittingfootnote{D.C. Benner, C.P. Rinsland, V. Malathy Devi, M.A.H. Smith, and D. Atkins. JQSRT 53 (1995) 705-721.} of all nine spectra in each band. A non-Voigt line shape with speed dependence was applied. Line mixing was also observed for several transition pairs. Preliminary results will be compared to other recent measurements reported in the literature.footnote{Research described in this paper are performed at the College of William and Mary, Jet Propulsion Laboratory, California Institute of Technology, Connecticut College and NASA Langley Research Center under contracts and cooperative agreements with the National Aeronautics and Space Administration.}Made available in DSpace on 2016-01-05T20:05:04Z (GMT). No. of bitstreams: 3
874.pdf: 20691 bytes, checksum: ce50c0c71802d9f12dc90795b78a9c5f (MD5)
320758.pptx: 7373443 bytes, checksum: e5a9cffac006b02f9deff4b02f033d64 (MD5)
license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5)
Previous issue date: 2
Spectral line shapes in the 2ν3 Q branch of 12CH4
No full textWe will present the first experimental measurements of spectral line shapes (self- and air-broadened half width, pressure shift, and line mixing (via off-diagonal relaxation matrix element) coefficients and their temperature dependences, where appropriate, for transitions in the 2 Q branch manifolds of CH in the 1.6 region. Employing a multispectrum nonlinear least squares technique\footnote{D.C. Benner, C.P. Rinsland, V. Malathy Devi, M.A. H. Smith, and D. Atkins. JQSRT 53 (1995) 705-721}, we simultaneously fitted 23 high-resolution spectra of CH and mixtures of CH in air, recorded at different pressure-temperature combinations between 130 and 296 K. These data were recorded using the Bruker IFS 125 HR Fourier transform spectrometer at the Jet Propulsion Laboratory together with two coolable sample cells\footnote{K. Sung, A.W. Mantz, M.A.H. Smith, L.R. Brown, T.J. Crawford, V.M. Devi, D.C. Benner. J.Mol. Spectrosc. 162 (2010)124-134.}\footnote{A.W. Mantz, K. Sung, T.J. Crawford, L.R. Brown, M.A.H. Smith, V.M. Devi, D.C. Benner, J. Mol. Spectrosc. 304 (2014) 12-24.}. By applying a set of constraints to the parameters of severely blended transitions, a self-consistent set of broadening, shift and line mixing parameters for CH-CH and CH-air collisions were retrieved. A quadratic speed dependence parameter common for all transitions in each Q(J) manifold was determined. In addition to line shape parameters, line positions and line intensities were also measured for over 100 transitions in the whole Q branch region (5996.5 - 6007.7 cm). Comparisons of present results with values in HITRAN2012 will be provided\footnote{Research described in this paper are performed at the College of William and Mary, Jet Propulsion Laboratory, California Institute of Technology, Connecticut College, and NASA Langley Research Center under contracts and cooperative agreements with the National Aeronautics and Space Administration.}Made available in DSpace on 2017-01-26T21:40:07Z (GMT). No. of bitstreams: 3
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
1591.pdf: 22374 bytes, checksum: d4127c1aea1242d66f43b74ce9331d35 (MD5)
583897.pptx: 2767904 bytes, checksum: 7f3b6bde4ba2162fc4e9a6068d193acb (MD5)
Previous issue date: 2016-06-2
Spectral line shape parameters for the ν1, ν2, and ν3 bands of HDO: self and CO2 broadened
No full textTo provide precise information relevant to Martian atmospheric remote sensing, high resolution high signal-to-noise ratio spectra of HDO in mixture with CO were recorded in the , , and fundamental bands between 2.7 and 7 m regions. The spectra were obtained with the Bruker IFS-125HR Fourier transform spectrometer at the Jet Propulsion Laboratory along with two specially built coolable absorption cells with path lengths of 0.2038 m\footnote{K. Sung, A.W. Mantz, M.A.H. Smith, L.R. Brown, T.J. Crawford, V.M. Devi, D.C. Benner. J. Mol. Spectrosc. 162 (2010) 124-134.} and 20.941 m\footnote{A.W. Mantz, K. Sung, T.J. Crawford, L.R. Brown, M.A.H. Smith, V.M. Devi, D.C. Benner, J. Mol. Spectrosc. 304 (2014) 12-24.} at various sample gas temperatures (220 – 296 K), total sample pressures and volume mixing ratios. A multispectrum nonlinear least squares technique\footnote{D.C. Benner, C.P. Rinsland, V. Malathy Devi, M.A. H. Smith, and D. Atkins. JQSRT 53 (1995) 705-721.} was applied to fit simultaneously all the spectra obtained. The measured line parameters include accurate line positions, intensities, self- and CO-broadened Lorentz halfwidth and pressure-shift coefficients, and temperature dependences of CO broadened HDO halfwidth and pressure-shift coefficients. Line mixing coefficients using the relaxation matrix formalism and quadratic speed dependence parameters were also measured where appropriate. Example results for select transitions in each band will be presented and comparisons made to other measured/calculated values\footnote{Research described in this paper are performed at the College of William and Mary, Jet Propulsion Laboratory, California Institute of Technology, Connecticut College, and NASA Langley Research Center under contracts and cooperative agreements with the National Aeronautics and Space Administration. RRG and CLR were supported by the National Science Foundation through Grant \# AGS-1156862.}.Made available in DSpace on 2017-01-26T21:40:09Z (GMT). No. of bitstreams: 3
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
1590.pdf: 21229 bytes, checksum: 228cfbc58c9f289bd074fd74b36f45f5 (MD5)
583530.pptx: 4187837 bytes, checksum: 5b8e5d997680a9a05527cca9483b616a (MD5)
Previous issue date: 2016-06-22RRG and CLR were supported by the National Science Foundation through Grant \# AGS-1156862
ABSOLUTE INTENSITIES OF LINES IN THE 9-11 REGION
No full textM. A. Smith, C. P. Rinsland, V. Malathy Devi and D. Chris Benner, 51st International Symposium on Molecular Spectroscopy, Paper MH14 (1996). H. M. Pickett, D.B. Peterson, and J.S. Margolis, J. Geophys. Res 97,20,787-20793 (1992). D. Chris Benner, C.P. Rinsland, V. Malathy Devi, M.A.H. Smith and D. Atkins, JQSRT 53, 705-721(1995). L. S. Rothman, R.R. Gamache, R. H. Tipping, C.P. Rinsland, M.A.H. Smith, D.C. Benner, V. Malathy Devi, J.M. Flaud, C. Camy-Peyrer, A. Perrin, A. Goldman, S.T. Massiee, L.R. Brown, and R.A. Toth, JQSRT 48,469-507(1992); L.S. Rothman et. al., in preparation.(1997). M.R. DeBacker and D. Courtois, 50th International Symposium on Molecular Spectroscopy, Paper RA06 (1995). M.R. DeBacker, B. Parvitte, V. Zeninari, and D. Courtois, JQRST 54, 1009-1018(1995).Author Institution: Atmospheric Sciences Division, NASA Langley Research Center; Department of Physics, The College of William and MaryWe have extended our previous analysis of high-resolution absorption spectra of to determine absolute intensities of nearly 200 lines in the 9-11 region. The spectra were recorded at room temperature using the Fourier transform spectrometer at the McMath-Pierce facility of the National Solar Observatory at Kitt Peak, covering the region at resolution. The ozone samples were contained in a glass cell having crossed IR-transmitting and UV-transmitting paths approximately 10 cm in each direction. A 254 nm UV-absorption monitor of the same design as Pickett was used to measure the ozone partial pressures, which were kept at approximately 0.3 to 0.5 Torr to prevent the appearance of saturated lines. Only spectra for which the ozone partial pressure varied by during the recording time were selected for analysis. Using our multispectrum nonlinear least-squares we have fit four spectra simultaneously to determine intensities for numerous lines in both the P and R branches of the fundamental band and several lines in the band. On average, our measured intensities are only 1% larger than the values on the current HITRAN . Our measurement set includes 44 lines in common with other recent experimental Comparison of these various measurements shows excellent agreement for a few lines and adequate agreement (considering all possible sources of uncertainty and systematic errors) for the others
SELF-AND -BROADENING AND SHIFT COEFFICIENTS IN THE BAND OF : REVISITED
No full textD. Chris Benner, C. P. Rinsland, V. Malathy Devi, M. A. H. Smith and D. Atkins, JQSRT 53, 705-721 (1995). V. Malathy Devi, D. Chris Benner, M. A. H. Smith, C. P. Rinsland and A. W. Mantz, JQSRT 75, 455-471 (2002).Author Institution: Department of Physics, The College of William and Mary; Department of Physics, The University of Lethbridge; Atmospheric Sciences, NASA Lang-ley Research Center; Department of Physics, Astronomy and Geophysics, Connecticut CollegeRoom temperature values for self-broadened and hydrogen-broadened Lorentz half width coefficients, and self and hydrogen pressure-induced shift coefficients have been measured for transitions with rotational quantum number index m ranging from -24 to +24 in the band of . The spectra were recorded with the McMath-Pierce Fourier transform spectrometer located at the National Solar Observatory on Kitt Peak. The analysis was performed using a multispectrum nonlinear least squares modified to constrain the Lorentz widths in the P and R branches to be identical for the same value. We have compared the present results with our previous measurements made with the same and with other measurements published recently
Self- and H2-broadened line parameters of carbon monoxide in the first overtone band
No full textIn this study we have re-analyzed high-resolution spectra of pure CO and CO broadened by hydrogen recorded
in the spectral range of the first overtone band.\footnote{V.~Malathy Devi \textit{et al.},
\textit{J.~Mol.~Spectrosc.} \underline{\textbf{228}} (2004) 580-592.} We have used four different line shapes in
the multispectrum analysis (Voigt, speed dependent Voigt,
Rautian, and Rautian with speed dependence) and compared the resulting line shape parameters.
The line mixing coefficients have been calculated
using the Exponential Power Gap and the Energy Corrected Sudden scaling laws.
A classical approach was applied
to calculate CO line widths in CO-H and CO-CO collisions.
The formulas of classical impact theory\footnote{R.~G.~Gordon, \textit{J.~Chem.~Phys.}
\underline{\textbf{44}} (1966) 3083-3089\textit{ibid.}, \underline{\textbf{45}} (1966) 1649-1655.}
are used for calculation of dipole absorption half-widths along with exact 3D Hamilton equations
for simulation of molecular motion. The calculations utilize Monte Carlo averaging over
collision parameters and simple interaction potential (Tipping-Herman + electrostatic).\footnote{J.-P.~Bouanich
and A.~Predoi-Cross, \textit{J.~Molec.~Structure} \underline{\textbf{742}} (2005)
183-190.}\footnote{A.~Predoi-Cross, J.-P.~Bouanich, D.~Chris Benner, A.~D.~May,
and J.~R.~Drummond, \textit{J.~Chem.~Phys.} \underline{\textbf{113}} (2000) 158-168.}
Molecules are treated as rigid rotors. The dependences of CO half-widths on rotational quantum number
are computed and compared with measured data at room temperature.Made available in DSpace on 2017-01-26T21:37:27Z (GMT). No. of bitstreams: 3
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
2001.pdf: 22596 bytes, checksum: cffc876be45f54f4eb3193a46c461548 (MD5)
734367.pptx: 4182963 bytes, checksum: af9c4c48b02fb838399a973dac02fb77 (MD5)
Previous issue date: 2016-06-2
- …
