EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Photo voltaic action spectra and efficiencies of chlorophyll a species absorbing near 700 nanometers


, : Photo voltaic action spectra and efficiencies of chlorophyll a species absorbing near 700 nanometers. Photochemistry & Photobiology 31(2): 143-156

Alcohol vapors affect the photovoltaic properties of anhydrous chlorophyll a (Chl a). At 23.degree. C, a photovoltaic cell of the type Al anhydrous Chl a Ag was successively submitted to nonsaturating vapors of methanol, ethanol, 1-propanol, 2-propanol, cyclopropyl carbinol, cyclopentanol, methyl cyclopropyl carbinol, 1-butanol, 1-pentanol and chloroethanol. The action spectrum of anhydrous Chl a has a maximum in the red at 672 nm. This maximum is shifted towards 700 nm under the influence of alcohol vapors. The most important changes occur for ethanol, 1-propanol and 2-propanol. In the same way, the conversion efficiencies of light energy into electrical energy, measured at the maximum in the red are, for the same alcohols, higher than the initial value 1.7 .times. 10-2% obtained on the average for anhydrous Chl a. A maximum value of 6.3 .times. 10-2% has been obtained after rehydration of Chl a solvated with 2-propanol. The influence of alcohol vapors has been interpreted in terms of microcapillarity of anhydrous Chl a and a mean microcavity radius of 11 .+-. 6 .ANG. was deduced from the photocurrent variation with the amount of alcohol vapor present in the measuring area. Furthermore, the action spectrum shift towards 700 nm was interpreted by the formation, at 23.degree. C, of Chl a special aggregates whose action spectrum was obtained by difference. IR spectroscopy demonstrated that anhydrous Chl a obtained from electrodeposition is an assembly of Chl a dimers and that alcohol vapors, producing the special aggregates formation at 23.degree. C, induce a decrease of the free C.dbd.O ketone band and an increase of the associated C.dbd.O esters band is not affected by the Chl a reorganization.

(PDF 0-2 workdays service)

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 006109635

PDF Full Text: Submit


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Rovai, D.; Lubrano, V.; Vassalle, C.; Paterni, M.; Marini, C.; Kozakova, M.; Castellari, M.; Taddei, L.; Trivella, M.G.; Distante, A.; DeMaria, A.N.; L'Abbate, A., 1998: Detection of perfusion defects during coronary occlusion and myocardial reperfusion after thrombolysis by intravenous administration of the echo-enhancing agent BR1. The purpose of this study was to detect myocardial perfusion defects as a result of coronary occlusion and myocardial reperfusion after thrombolysis with intravenous (i.v.) administration of the echo contrast agent BR1 (Bracco Research, Switzerlan...

Wen, X-R.; Li, C.; Zong, Y-Y.; Yu, C-Z.; Xu, J.; Han, D.; Zhang, G-Y., 2008: Dual inhibitory roles of geldanamycin on the c-Jun NH2-terminal kinase 3 signal pathway through suppressing the expression of mixed-lineage kinase 3 and attenuating the activation of apoptosis signal-regulating kinase 1 via facilitating the activation of Akt in ischemic brain injury. It is well documented that heat-shock protein (hsp90) plays an essential role in maintaining stability and activity of its clients. Recent studies have shown that geldanamycin (GA), an inhibitor of hsp90, could decrease the protein of mixed-lineag...

Iliff, D.A.; Chandler, P.J., 2000: Case 3090 Musca arcuata and M festiva Linnaeus, 1758 and M citrofasciata De Geer, 1776 Proposed conservation of usage of the specific names by the designation of neotypes for M arcuata and M festiva. The purpose of this application is to conserve the long prevailing usage of the names of three hoverflies, Chrysotoxum arcuatum (Linnaeus, 1758), Chrysotoxum festivum (Linnaeus, 1758) and Xanthogramma citrofasciatum (De Geer, 1776). There has been...

Fimognari, F.Luca.; Pastorelli, R.; Incalzi, R.Antonelli., 2006: Phenformin-induced lactic acidosis in an older diabetic patient: a recurrent drama (phenformin and lactic acidosis). Diabetes Care 29(4): 950-951

Oishi, K.T.minaga, M.K.wato, A.A.e, Y.I.ayasu, S.N.nba, A., 1992: Development of on-line sensoring and computer aided control systems for sake brewing. Journal of Biotechnology 24(1): 53-74

Koch, A.M.E.; Zink, S.; Singer, H., 2007: B-type natriuretic peptide in patients with systemic right ventricle. Objective: To examine the diagnostic value of B-type natriuretic peptide (BNP) in patients with systemic right ventricle.Methods: Plasma BNP levels were measured in 48 outpatients with D-transposition of the great arteries after atrial switch pro...

Maggouta, F.; Li, S.A.; Li, J.J.; Norris, J.S., 1997: Glutathione S-transferase Yc cDNA from Syrian hamster kidney. A cDNA encoding alpha-class glutathione S-transferase Yc (GSTYc) has been isolated from a Syrian hamster kidney library, and its nucleotide sequence (968 bp) has been determined. Analysis of the deduced amino acid sequence revealed a high level of...

Kassam-Adams, N.; García-España, J.Felipe.; Marsac, M.L.; Kohser, K.L.; Baxt, C.; Nance, M.; Winston, F., 2011: A pilot randomized controlled trial assessing secondary prevention of traumatic stress integrated into pediatric trauma care. Medical settings provide opportunities for secondary prevention of traumatic stress and other sequelae of pediatric injury. This pilot randomized trial evaluated the delivery and effectiveness of a targeted preventive intervention based on best pr...

Landau B.J., 1978: Replication of coxsackievirus b 3 in primary mouse cell cultures of cardiac origin. Abstracts of the Annual Meeting of the American Society for Microbiology 78 : 233

Guinn, B.A.; Evely, R.S.; Walsh, V.; Gilkes, A.F.; Burnett, A.K.; Mills, K.I., 2000: An in vivo and in vitro comparison of the effects of b2-a2 and b3-a2 p210BCR-ABL splice variants on murine 32D cells. The Philadelphia (Ph) chromosome, a characteristic cytogenetic marker of chronic myeloid leukaemia (CML), is caused by a reciprocal translocation juxtaposing the 3' region of the ABL gene onto the 5' region of the BCR gene. Due to conser...