Effects of the Exciting Wavelength and Viscosity on the Photobehavior of 9- and 9,10-Bromoanthracenes

2007 ◽  
Vol 111 (27) ◽  
pp. 5948-5953 ◽  
Author(s):  
Gianna Favaro ◽  
Maria R. di Nunzio ◽  
Pier Luigi Gentili ◽  
Aldo Romani ◽  
Ralph S. Becker
Keyword(s):  
Exciting Wavelength

On the absence of triplet ketene in ketene excited in the region 2800–3660 Å

1969 ◽  
Vol 47 (16) ◽  
pp. 3079-3081 ◽  
Author(s):  
M. Grossman ◽  
G. P. Semeluk ◽  
I. Unger
Keyword(s):  
Wavelength Region ◽  
Exciting Wavelength

The sensitized biacetyl emission technique was used in an attempt to detect triplet ketene molecules, which might be formed when ketene is excited by light ranging in wavelength from 2800 to 3600 Å. No sensitized emission was observed in this exciting wavelength region thus confirming the recent results of Voisey (1) which also show that triplet ketene is not produced when ketene is excited by light between 2800 and 3200 Å, and that the triplet CH2 found in such systems must arise from some source other than triplet ketene.

The Ability of Photosensitization and Anti-cancer of ZnPcSP under Different Exciting Wavelength

1997 ◽  
Vol 13 (03) ◽  
pp. 247-251 ◽  
Author(s):  
Huang Jian-Dong ◽  
◽  
Liu Er-Sheng ◽  
Yang Su-Ling ◽  
Ouyang Rui-Zhen ◽  
...  
Keyword(s):  
Exciting Wavelength ◽  
Anti Cancer

High-performance liquid-chromatographic separation and fluorescence measurement of biogenic amines in plasma, urine, and tissue.

1978 ◽  
Vol 24 (8) ◽  
pp. 1317-1324 ◽  
Author(s):  
T P Davis ◽  
C W Gehrke ◽  
C W Gehrke ◽  
T D Cunningham ◽  
K C Kuo ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
Fluorescence Measurement ◽  
Tissue Samples ◽  
Liquid Chromatographic Separation ◽  
Exciting Wavelength ◽  
Liquid Chromatographic Method ◽  
Stepwise Gradient ◽  
Liquid Chromatographic

Abstract We describe a high-performance liquid-chromatographic method for measuring histamine, norepinephrine, octopamine, normetanephrine, dopamine, serotonin, and tyramine in plasma (2 ml), brain (0.2 g), or urine. These amines are modifed by pre-column derivatization with o-phthalaldehyde, which stabilizes the molecules, facilitates extraction, and improves detection of nanogram amounts. Before separation, samples were neutralized with KOH and immediately derivatized and extracted into ethyl acetate, in which derivatives were stable for longer than 24 h. Interfering amino acids were removed from ethyl acetate by partitioning twice with Na2HPO4 buffer (pH 10.0). Separation was complete in about 90 min on a "mu Bondapak/phenyl" column, with which a stepwise gradient of methanol/phosphate buffer (pH 5.1) was used. A variable-wavelength fluorometer was used (exciting wavelength, 340 nm; emission wavelength, 480 nm). Amount and response were linearly related from 1 to 200 pmol. Precision (CV) for retention times was 1%, for derivatization and injection 2.5%. Analytical recoveries of the seven amines from 2 ml of plasma fortified with 200 pmol averaged 65% (CV approximately 8%). Data on rat-brain tissue samples are compared with results by the trihydroxyindole method. Application of the method to urine from normal persons and a patient with a brain tumor is demonstrated.

Spectrofluorometric studies. III. Ortho- and para-difluorobenzene

1968 ◽  
Vol 46 (20) ◽  
pp. 3177-3182 ◽  
Author(s):  
J. L. Durham ◽  
G. P. Semeluk ◽  
I. Unger
Keyword(s):  
Quantum Yield ◽  
Gas Phase ◽  
Corner Effect ◽  
Exciting Wavelength

Spectrofluorometric techniques have been used to determine gas phase singlet and triplet yields in ortho- and para-difluorobenzene as a function of exciting wavelength and pressure. The importance of the "around the corner effect" in such measurements as the cause of large errors is briefly discussed.In the case of ortho-difluorobenzene, maxima in fluorescent yield are produced by the exciting wavelengths 2490, 2580, and 2700 Å; minima at 2540 and 2660 Å. Triplet yields, using the sensitized biacetyl emission technique, have been determined at 2500, 2580, 2660, and 2700 Å. The sums of the singlet and triplet yields at these wavelengths are 0.34, 0.52, 0.75, and 0.97 respectively.Para-difluorobenzene has the largest quantum yield of fluorescence of any fluorinated benzene yet examined. The fluorescent yield shows only one definite minimum at 2740 Å. Triplet yields have been determined at 2660, 2740, and 2760 Å. The sums of the singlet and triplet yields at these wavelengths are 0.5, 0.5, and 0.7 respectively.

Ultraviolet Resonance Raman Spectra of Escherichia Coli with 222.5–251.0 nm Pulsed Laser Excitation

1988 ◽  
Vol 42 (5) ◽  
pp. 782-788 ◽  
Author(s):  
K. A. Britton ◽  
R. A. Dalterio ◽  
W. H. Nelson ◽  
D. Britt ◽  
J. F. Sperry
Keyword(s):  
Escherichia Coli ◽  
Amino Acids ◽  
Nucleic Acid ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Aromatic Amino Acids ◽  
Selective Excitation ◽  
Exciting Wavelength ◽  
Resonance Raman Spectra ◽  
Ultraviolet Resonance Raman

Resonance Raman spectra of the gram-negative organism, Escherichia coli, have been obtained with 222.5-, 230.6-, and 251.0-nm excitation, and the results have been compared with those reported earlier for 242.4-nm excitation. Major changes in bacterial spectra have been observed with changes in exciting wavelength. The origins of the major peaks in each spectrum have been explained primarily in terms of contributions of nucleic acid bases and aromatic amino acids. As an aid in making assignments, spectra of aromatic amino acids, nucleosides, and mixtures of the two have been obtained at each wavelength used to excite bacterial spectra. Background fluorescence has been observed to be negligible below 251 nm. Selective excitation of bacterial nucleic acid and protein components has been done with ease. Results suggest that an extension of the exciting wavelength range to 190–220 nm will allow the selective excitation of additional cell components.

Sensitivity of laser-induced upconversion fluorescence dynamics to exciting wavelength in Er3+-doped YAG

2011 ◽  
Vol 103 (4) ◽  
pp. 857-861 ◽  
Author(s):  
S. Du ◽  
L. Jiang ◽  
W. Zhang ◽  
W. Gong ◽  
Z. Fu ◽  
...  
Keyword(s):  
Upconversion Fluorescence ◽  
Exciting Wavelength

Study on Spatial Distribution of UVA Radiant Intensity for Ballast Water Treatment

2014 ◽  
Vol 644-650 ◽  
pp. 5216-5219
Author(s):  
Man Xia Zhang ◽  
Cheng Yu Yuan ◽  
Lei Shi ◽  
Wen Shi ◽  
Yi Min Zhu
Keyword(s):  
Experimental Data ◽  
Spatial Distribution ◽  
Water Treatment ◽  
Radiant Intensity ◽  
Photo Catalysis ◽  
Exciting Wavelength ◽  
Ballast Water Treatment ◽  
Radiation Conditions ◽  
Uva Radiation ◽  
Transmission Ability

UVA is seldom applied in UV inactivation or disinfection, however, it may be more suitable for underwater photo-catalysis treatment. Since the wavelength of UVA is longer than UVC, the former has higher transmission ability and encounter less disturbance of suspending substances in water. Also, the exciting wavelength of UVA is between 365nm and 413nm which coincides with the wavelength of UVA. Hence, the spatial distribution of UVA radiation is studied for a 15W UVA lamp. The decaying tendencies of UVA radiation intensity were probed over horizontal and vertical distance, behind large amounts of experimental data. Optimal radiation conditions plan to be detected based on the research to guide the UVA treatment.

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