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Starecki T, Pietrzak MH, Ścisłowski MK. Properties of a Symmetrical Photoacoustic Helmholtz Cell Operating with Imbalanced Counterphase Light Stimulation. SENSORS (BASEL, SWITZERLAND) 2023; 23:7150. [PMID: 37631687 PMCID: PMC10457826 DOI: 10.3390/s23167150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 07/30/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023]
Abstract
The output signal from a photoacoustic cell based on a symmetrical Helmholtz resonator structure can be substantially increased if a counterphase light stimulation is applied to the cell cavities. However even slight differences in the intensity of the light beams irradiating the cavities may affect the frequency response of the cell and the output signal level. This paper shows the influence of the imbalanced light irradiation on the properties of such a cell. It was found that even at relatively high irradiation mismatch, and even with the photoacoustic signal detection implemented with a single microphone, the influence of the irradiation imbalance on the frequency response of the cell around the resonance frequency is not critical. In the case of differential detection of the photoacoustic signal, the imbalance of the light irradiation does not affect the frequency response of the cell, but only the output signal level.
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Affiliation(s)
- Tomasz Starecki
- Institute of Electronic Systems, Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland
| | - Michał Henryk Pietrzak
- Institute of Electronic Systems, Faculty of Electronics and Information Technology, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland
- XIV LO im. Stanisława Staszica, Nowowiejska 37A, 02-010 Warsaw, Poland
| | - Marcin Kamil Ścisłowski
- Faculty of Mathematics and Information Science, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
- XLVIII LO im. Edwarda Dembowskiego, Barska 32, 02-315 Warsaw, Poland
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2
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Photophysical studies of tetratolylporphyrin photosensitizers for potential medical applications. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.12.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Staśkowiak E, Dudkowiak A, Hanyż I, Wiktorowicz K, Frąckowiak D. Spectral properties of stilbazolium merocyanines – potential sensitizers in photodynamic therapy and diagnosis. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/s1010-6030(03)00439-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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The interactions between tetrapyridyl porphyrin and viologen units covalently linked to polymers. J Photochem Photobiol A Chem 2003. [DOI: 10.1016/s1010-6030(03)00190-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Wróbel D. Organic photovoltaic solar cells: spectroscopic and photoelectric properties of photoactive dyes. CR CHIM 2003. [DOI: 10.1016/s1631-0748(03)00052-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Study of the influence of substituents on spectroscopic and photoelectric properties of zinc phthalocyanines. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00132-6] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Havaux M, Lorrain L, Leblanc RM. In vivo measurement of spectroscopic and photochemical properties of intact leaves using the ‘mirage effect’. FEBS Lett 2001. [DOI: 10.1016/0014-5793(89)80763-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Photovoltaic effects in substituted metal-free and metallic sulfophthalocyanines in the photoelectrochemical cell. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(01)00525-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Frackowiak D, Planner A, Waszkowiak A, Boguta A, Ion RM, Wiktorowicz K. Yield of intersystem (singlet–triplet) crossing in phthalocyanines evaluated on the basis of a time in resolved photothermal method. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(01)00438-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Wróbel D, Boguta A, Ion RM. Mixtures of synthetic organic dyes in a photoelectrochemical cell. J Photochem Photobiol A Chem 2001. [DOI: 10.1016/s1010-6030(00)00377-4] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Wróbel D, Goc J, Ion R. Photovoltaic and spectral properties of tetraphenyloporphyrin and metallotetraphenyloporphyrin dyes. J Mol Struct 1998. [DOI: 10.1016/s0022-2860(98)00434-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Miyake J, Kusumi T, Dudkowiak A, Goc J, Frckowiak D. The interactions between bacteriochlorophyll c and amphiphilic peptides. J Photochem Photobiol A Chem 1998. [DOI: 10.1016/s1010-6030(98)00296-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Planner A, Goc J, Dudkowiak A, Frackowiak D, Miyake J. The influence of the presence of lipid on the aggregation of 8,12-diethyl farnesyl bacteriochlorophyll c located in adsorbed layers and monolayers. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 1997; 39:73-80. [PMID: 9210324 DOI: 10.1016/s1011-1344(96)07473-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The photoacoustic spectra and time-resolved delayed luminescence spectra in the microsecond time range were measured for layers of 8,12-diethyl farnesyl bacteriochlorophyll c adsorbed on quartz supports by solvent evaporation and as Langmuir-Blodgett monolayers. Both types of model system were also investigated with the addition of lipid. The data showed a very strong influence of lipid addition on pigment aggregation. In samples with synthetic and natural lipid addition, the pigments were found to be predominantly in the monomeric and dimeric states, whereas in the same type of sample without lipid, the pigments were aggregated to a higher degree. The influence of the presence of lipid on the aggregation of bacteriochlorophyll c in monolayers and adsorbed layers may also suggest that the contact of various pigment molecules with the lipids surrounding the chlorosome may influence the formation of various pigment aggregates in vivo. The synthetic lipid L-alpha-phosphatidylcholine dipalmitoyl and the natural lipid L-alpha-phosphatidylcholine type IVS from soy beans were used. In the latter case, only adsorbed layers were investigated. Our interpretation is preliminary as only one 8,12-diethyl farnesyl bacteriochlorophyll c homologue was present in our systems.
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Affiliation(s)
- A Planner
- Institute of Physics, Poznań University of Technology, Poland
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14
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Goc J, Hara M, Tateishi T, Miyake J, Planner A, Fra̧ckowiak D. Spectral properties of the photosynthetic reaction units reconstituted from bacterial reaction centres and antenna pigments located in liposomes suspended in buffer or ordered in Langmuir-Blodgett films. J Photochem Photobiol A Chem 1997. [DOI: 10.1016/s1010-6030(96)04555-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Frackowiak D, Zelent B, Malak H, Cegielski R, Goc J, Niedbalska M, Ptak A. Interactions between chlorophyll a and beta-carotene in nematic liquid crystals. Biophys Chem 1995; 54:95-107. [PMID: 7756570 DOI: 10.1016/0301-4622(94)00118-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Fluorescence lifetime in the ps range, polarized absorption, polarized fluorescence spectra and delayed luminescence time resolved spectra were measured for chlorophyll a solutions with and without beta-carotene addition in nematic liquid crystal. Photoacoustic spectra of the same samples at various frequencies of light modulation were also taken. The frequency dependence of the photoacoustic spectra suggests that part of the excitation is converted into heat in a slow process (with a decay time of the order of ms). The lifetime results suggest that at used concentration some aggregation of the chlorophyll a occurs. The chlorophyll a molecules interact strongly with the beta-carotene forming some nonfluorescent or weakly fluorescent aggregates characterized by having various thermal deactivation yields and orientations in anisotropic matrix when compared to those of separated pigments. It seems that the aggregated forms of the chlorophylls are partially disrupted as a result of the their interaction with the beta-carotene. Singlet excitation of beta-carotene is not transferred to the fluorescent form of chlorophyll a. Delayed (in microsecond time range) luminescence of chlorophyll a is quenched by beta-carotene. This luminescence is located in the same spectral region as prompt fluorescence. Interactions between chlorophyll a and beta-carotene depend on the degree of pigment orientation and their aggregation.
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Affiliation(s)
- D Frackowiak
- Institute of Physics, Poznań University of Technology, Poland
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17
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Frackowiak D, Abdourakhmanov I, Cegielski R, Leblanc RM. POLARIZED SPECTRA OF ORIENTED PIGMENT-LIPOPROTEIN COMPLEXES FROM THE PURPLE BACTERIUM: Chromatium minutissimum. Photochem Photobiol 1993. [DOI: 10.1111/j.1751-1097.1993.tb09228.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Fork DC, Herbert SK. THE APPLICATION OF PHOTOACOUSTIC TECHNIQUES TO STUDIES OF PHOTOSYNTHESIS. Photochem Photobiol 1993. [DOI: 10.1111/j.1751-1097.1993.tb02277.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Distribution of energy absorbed by purple bacteria between various paths of de-excitation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1992. [DOI: 10.1016/1011-1344(92)80015-n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Frackowiak D, Cegielski R, Abdourakhmanov I, Leblanc RM. Photothermal spectroscopy of bacteriochlorophyll-lipoprotein complexes. Biochem Biophys Res Commun 1992; 186:327-33. [PMID: 1632776 DOI: 10.1016/s0006-291x(05)80811-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Photoacoustic spectra at room and 85 K temperatures as well as photothermal beam deflection spectra of bacteriochlorophyll-lipoprotein complexes from purple bacterium Chromatium minutissimum were measured. Spectra were compared and obtained differences were tentatively explained by various inertion of these two methods. Photothermal beam deflection method measure the heat which is generated in close surroundings of absorbing pigment molecule, whereas usage of more inert photoacoustic signal is averaged over contributions from various pigments located in a larger sample volume and therefore is similar to absorption spectra.
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Affiliation(s)
- D Frackowiak
- Institute of Physics, Poznań Technical University, Poland
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21
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Malkin S, Charland M, Leblanc RM. A photoacoustic study of water infiltrated leaves. PHOTOSYNTHESIS RESEARCH 1992; 33:37-50. [PMID: 24408446 DOI: 10.1007/bf00032981] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/1991] [Accepted: 04/08/1992] [Indexed: 06/03/2023]
Abstract
Photoacoustic measurements of photosynthetic energy storage were conducted on water infiltrated pea and sugar maple leaves. The samples were vacuum infiltrated with pure water or with a suitable buffer. The use of such methodology permitted an accurate determination of the energy storage parameter at low modulation frequencies, where in non-infiltrated leaves oxygen evolution dominates the photoacoustic signal and does not allow energy storage measurements. Differences between infiltration media were not essential, however the use of pure water as infiltration medium sometimes caused instability of the measured energy storage, particularly at longer experimental time. Values of energy storage in individual samples ranged mostly between 0.2 to 0.35. Measured as a function of the modulation frequency, energy storage was found to be constant from about 10 to 200 Hz for pea leaves. In sugar maple leaves, the energy storage slightly increased between 100 and 500 Hz. Obtaining an accurate value for energy storage also allowed an accurate estimation of the O2 evolution contribution to the photoacoustic signal of an unfiltrated leaf. In a maple leaf its frequency dependence showed only the effect of diffusion in the entire frequency range (10-500 Hz). Energy storage transients were observed after long periods (ca. 1/4-2 hrs) of dark adaptation upon the transition to light. In this case the initial energy storage was roughly about 1/2 that of the steady state value indicating strong PS I activity, while PS II was transiently incompetent. Energy-storage increased during illumination in a way to correspond to photosynthetic induction events as previously measured by fluorescence and O2 evolution. Transients in energy storage were also found following high light to low light transitions (i.e., switch off of the saturating background light), that paralleled similar transients in oxygen evolution, showing initial transient inactivation followed by progressive reactivation of PS II.
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Affiliation(s)
- S Malkin
- Centre de recherche en photobiophysique, Université du Québec à Trois-Rivières, 3351, boul. des Forges, C.P. 500, G9A 5H7, Trois-Rivières, Québec, Canada
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22
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Photoacoustic signal generation in leaves: are O2-consuming processes involved? BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1992. [DOI: 10.1016/s0005-2728(05)80345-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Fluorescence anisotropy of cyanobacterial phycobilisomes oriented in polyvinyl alcohol (PVA) films. J Fluoresc 1991; 1:225-34. [DOI: 10.1007/bf00865247] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/1991] [Revised: 12/02/1991] [Accepted: 12/05/1991] [Indexed: 10/26/2022]
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24
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CARPENTIER ROBERT, OWENS THOMASG, LEBLANC ROGERM. SIMULTANEOUS SATURATION OF VARIABLE FLUORESCENCE YIELD AND PHOTOACOUSTICALLY MONITORED THERMAL EMISSION IN THYLAKOID MEMBRANES. Photochem Photobiol 1991. [DOI: 10.1111/j.1751-1097.1991.tb03672.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Owens TG, Carpentier R, Leblanc RM. Detection of photosynthetic energy storage in a photosystem I reaction center preparation by photoacoustic spectroscopy. PHOTOSYNTHESIS RESEARCH 1990; 24:201-208. [PMID: 24420072 DOI: 10.1007/bf00032307] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/1989] [Accepted: 12/18/1989] [Indexed: 06/03/2023]
Abstract
Thermal emission and photochemical energy storage were examined in photosystem I reaction center/core antenna complexes (about 40 Chl a/P700) using photoacoustic spectroscopy. Satisfactory signals could only be obtained from samples bound to hydroxyapatite and all samples had a low signal-to-noise ratio compared to either PS I or PS II in thylakoid membranes. The energy storage signal was saturated at low intensity (half saturation at 1.5 W m(-2)) and predicted a photochemical quantum yield of >90%. Exogenous donors and acceptors had no effect on the signal amplitudes indicating that energy storage is the result of charge separation between endogenous components. Fe(CN)6 (-3) oxidation of P700 and dithionite-induced reduction of acceptors FA-FB inhibited energy storage. These data are compatible with the hypothesis that energy storage in PS I arises from charge separation between P700 and Fe-S centers FA-FB that is stable on the time scale of the photoacoustic modulation. High intensity background light (160 W m(-2)) caused an irreversible loss of energy storage and correlated with a decrease in oxidizable P700; both are probably the result of high light-induced photoinhibition. By analogy to the low fluorescence yield of PS I, the low signal-to-noise ratio in these preparations is attributed to the short lifetime of Chl singlet excited states in PS I-40 and its indirect effect on the yield of thermal emission.
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Affiliation(s)
- T G Owens
- Section of Plant Biology, Cornell University, 14853-5908, Ithaca, NY, USA
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26
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Lorrain L, Havaux M, Tessier A, Leblanc RM. PHOTOTHERMAL DEFLECTION SPECTROSCOPY OF PHOTOSYNTHETIC PIGMENTS in vivo and in vitro. Photochem Photobiol 1990. [DOI: 10.1111/j.1751-1097.1990.tb01743.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Havaux M, Lorrain L, Leblanc RM. Photothermal beam deflection: a new method for in vivo measurements of thermal energy dissipation and photochemical energy conversion in intact leaves. PHOTOSYNTHESIS RESEARCH 1990; 24:63-73. [PMID: 24419766 DOI: 10.1007/bf00032645] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/1989] [Accepted: 09/20/1989] [Indexed: 06/03/2023]
Abstract
A novel photosynthetic technique, photothermal deflection spectroscopy, is presented which is based on the 'mirage effect' and allows the rapid measurement of thermal deactivation of excited pigments in leaf samples placed in an open cell. Modulated heat emission from leaves illuminated with intensity-modulated light was measured via the detection of the periodic deflection of a laser beam parallel to the sample surface. Photothermal deflection signals can be monitored in vivo in leaves placed in various, liquid or gaseous, environments with a satisfactory signal-to-noise ratio close to 60-80 (in distilled water) at low modulation frequencies (below 50 Hz). Using this new and simple photothermal method, it was possible to easily obtain useful information on the leaf photochemical activity and its light-saturation characteristics under normal or stress conditions, suggesting that in vivo deflection signals could be used for assaying the photosynthetic state of health of crop plants. The beam deflection method presented in this paper appears to be a potentially useful photosynthetic tool complementary to the related photoacoustic technique.
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Affiliation(s)
- M Havaux
- Centre de Recherche en Photobiophysique, Université de Québec à Trois-Rivières, G9A 5H7, Trois-Rivières, Québec, Canada
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Wróbel D, Hendrich W. Thermal deactivation and energy transfer in isolated photosystem 2 and light-harvesting complexes in poly(vinyl alcohol) film. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 1989. [DOI: 10.1016/1011-1344(89)80036-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Boucher F, Leblanc RM, Savage S, Beaulieu B. Depth-resolved chromophore analysis of bovine retina and pigment epithelium by photoacoustic spectroscopy. APPLIED OPTICS 1986; 25:515. [PMID: 18231204 DOI: 10.1364/ao.25.000515] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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30
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Drabent R, Fra̧ckowiak D, Jadżyn C, Hotchandani S, Leblanc R. Photoacoustic spectra and photovoltaic effect of flavins. Biochim Biophys Acta Gen Subj 1985. [DOI: 10.1016/0304-4165(85)90045-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Frackowiak D, Hotchandani S, Bialek-Bylka G, Leblanc RM. POLARIZED PHOTOACOUSTIC SPECTRA OF PHYCOERYTHRIN and PHYCOCYANIN IN ANISOTROPIC POLYMER FILMS. Photochem Photobiol 1985. [DOI: 10.1111/j.1751-1097.1985.tb01611.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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32
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Frackowiak D, Hotchandani S, Leblanc RM. PHOTO ACOUSTIC SPECTRA OF PHYCOBILIPROTEINS and CHLOROPHYLLIN IN ISOTROPIC and ANISOTROPIC POLYVINYL ALCOHOL FILMS. Photochem Photobiol 1985. [DOI: 10.1111/j.1751-1097.1985.tb01610.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Carpentier R, Nakatani HY, Leblanc RM. Photoacoustic detection of energy conversion in a Photosystem II submembrane preparation from spinach. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1985. [DOI: 10.1016/0005-2728(85)90156-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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34
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Carpentier R, Larue B, Leblanc RM. Photoacoustic spectroscopy of Anacystis nidulans. I. Effect of sample thickness on the photoacoustic signal. Arch Biochem Biophys 1983; 222:403-10. [PMID: 6405695 DOI: 10.1016/0003-9861(83)90537-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A photoacoustic spectroscopy study of the cyanobacteria Anacystis nidulans has been undertaken. It is demonstrated, by using a filter deposition technique, that the photoacoustic signal intensity becomes progressively saturated as the thickness of the algal layer is increased. This saturation effect originates mostly from the limited optical penetration of the sample and distorts the photoacoustic spectrum from its true shape. A theoretical model is proposed to explain these results, and practical means to obviate the limitations of this spectroscopic technique are suggested.
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36
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Boucher F, Leblanc RM. Photoacoustic spectroscopy of cattle visual pigment at low temperature. Biochem Biophys Res Commun 1981; 100:385-90. [PMID: 7259757 DOI: 10.1016/s0006-291x(81)80108-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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