Results 31 to 40 of about 266,575 (326)

Protonation of maleic and fumaric acid in aqueous sulfuric acid solutions [PDF]

Journal of the Serbian Chemical Society, 2000
The protonations of maleic and fumaric acid in an acidic medium (aqueous solutions of sulfuric acid) were followed spectrophotometrically at room temperature. The acid-base equilibria were characterised qualitatively and quantitatively. The pKBH+
Jankovska Katica, Šoptrajanova Lidija, Spirevska Ilinka   +2 more
doaj   +1 more source

Gran Telescopio Canarias OSIRIS Transiting Exoplanet Atmospheric Survey: Detection of potassium in XO-2b from narrowband spectrophotometry [PDF]

, 2010
We present Gran Telescopio Canarias (GTC) optical transit narrow-band photometry of the hot-Jupiter exoplanet XO-2b using the OSIRIS instrument. This unique instrument has the capabilities to deliver high cadence narrow-band photometric lightcurves ...
A. Lecavelier des Etangs, A. Vidal-Madjar, Agol, Batygin, Brown, Burke, Burrows, Carter, Charbonneau, Charbonneau, Colón, Czesla, D. Ehrenreich, D. K. Sing, Deming, Désert, Désert, Désert, F. Pont, Fernandez, Fortney, Fortney, Fortney, Fortney, Freedman, G. E. Ballester, Grillmair, Henry, Hubbard, Hubeny, Hébrard, J. Cepa, J. J. Fortney, J.-M. Désert, Knutson, Knutson, Knutson, Lecavelier des Etangs, Lodders, M. López-Morales, M. Shabram, Machalek, Mandel, Moffat, Pont, Pont, Redfield, Rogers, Seager, Seager, Sing, Sing, Sing, Sing, Sing, Snellen, Spiegel, Sudarsky, Vidal-Madjar, Zahnle   +59 more
core   +3 more sources

A Novel Spectrophotometric Method for Determination of Chloramphenicol Based On Diazotization Reaction at Room Temperature

Indonesian Journal of Chemistry, 2016
An analytical method for determination of chloramphenicol (CAP) based on the diazotization reaction at room temperature has been developed. The CAP was reduced using zinc powder (Zn) and diazotization reaction was carried out at room temperature in the ...
Abdul Wafi, Ganden Supriyanto, Tjitjik Srie Tjahjandarie   +2 more
doaj   +1 more source

The Distance to the Large Magellanic Cloud from the Eclipsing Binary HV2274 [PDF]

, 1998
The distance to the Large Magellanic Cloud (LMC) is crucial for the calibration of the Cosmic Distance Scale. We derive a distance to the LMC based on an analysis of ground-based photometry and HST-based spectroscopy and spectrophotometry of the LMC ...
A. Giménez, D. H. Bradstreet, E. F. Guinan, E. L. Fitzpatrick, F. P. Maloney, I. Ribas, J. D. Pritchard, L. E. DeWarf, Massa D., P. A. Maurone, Watson R. D.   +10 more
core   +3 more sources

The Changing Fractions of Type Ia Supernova NUV-Optical Subclasses with Redshift [PDF]

, 2014
UV and optical photometry of Type Ia supernovae (SNe Ia) at low redshift have revealed the existence of two distinct color groups, NUV-red and NUV-blue events.
Brown, Peter J., Foley, Ryan J., Milne, Peter A., Narayan, Gautham   +3 more
core   +4 more sources

Spectrophotometric Determination of Mesalazine Via Arsenazo III- Cerium(III) Reaction [PDF]

مجلة التربية والعلم, 2011
A simple and sensitive spectrophotometric method has been developed for the determination of mesalazine (5-aminosalicylic acid) in pure form and in its pharmaceutical preparation(capsule).
Zeena Z. Al-Abdaly
doaj   +1 more source

3D Spectrophotometry of Planetary Nebulae in the Bulge of M31 [PDF]

, 2003
We introduce crowded field integral field (3D) spectrophotometry as a useful technique for the study of resolved stellar populations in nearby galaxies. As a methodological test, we present a pilot study with selected extragalactic planetary nebulae (XPN)
Andreas Kelz, Bacon R., Fried D. L., Goudfrooij P., Hoessel J. G., Jurgen Schmoll, Larson R. B., Martin M. Roth, Meisenheimer K., Sabbadin F., Saglia R. P., Shaver P. A., Si’lchenko O., Supper R., Thomas Becker, Walsh J. R., Walsh J. R., White S. D. M.   +17 more
core   +1 more source

Interpreting Flux from Broadband Photometry [PDF]

, 2016
We discuss the transformation of observed photometry into flux for the creation of spectral energy distributions and the computation of bolometric luminosities.
Breeveld, Alice, Brown, Peter J., Roming, Peter W. A., Siegel, Michael   +3 more
core   +4 more sources

Influence of Metal Ion Complexation on the Acid Dissociation of 4'-Carboxybenzo-24-Crown-8 in an Ethanol-Water Mixture [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1997
A spectrophotometric method was used to determine the acidity constant of 4'-carboxybenzo-24-crown-8 in 52% (w/w) ethanol-water mixture. The acid dissociation constant, Ka, was found to increase in the presence of Na+, K+, Rb+, Cs+ and Tl+ ions.
Ahmad Rouhollahi, Mohammad Reza Ganjali, Abolghasem Moghimi, Mojtaba Shamsipur   +3 more
doaj  

Analysis Of Vitamin C Level In Red And White Pepper (Punica granatum L.) Fruit Spectrophotometry UV-VIS

Window of Health, 2019
Vitamin C is one of the nutrients that act as antioxidants derived from fruits and green vegetables, such as the pomegranate (Punica granatum L.). This study aims to analisis levels of vitamin C in meat pomegranate (Punica granatum L.) red and white with
Andi Maulana, Zainal Abidin, Sugiarto Sadjidin, Tadjuddin Naid   +3 more
doaj   +1 more source