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Relevant bibliographies by topics / Absorption spectra. Chlorophyll

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Academic literature on the topic 'Absorption spectra. Chlorophyll'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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Journal articles on the topic "Absorption spectra. Chlorophyll"

1

Kume, Atsushi, Tomoko Akitsu, and Kenlo Nishida Nasahara. "Why is chlorophyll b only used in light-harvesting systems?" Journal of Plant Research 131, no. 6 (2018): 961–72. http://dx.doi.org/10.1007/s10265-018-1052-7.

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Abstract Chlorophylls (Chl) are important pigments in plants that are used to absorb photons and release electrons. There are several types of Chls but terrestrial plants only possess two of these: Chls a and b. The two pigments form light-harvesting Chl a/b-binding protein complexes (LHC), which absorb most of the light. The peak wavelengths of the absorption spectra of Chls a and b differ by c. 20 nm, and the ratio between them (the a/b ratio) is an important determinant of the light absorption efficiency of photosynthesis (i.e., the antenna size). Here, we investigated why Chl b is used in

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2

Zamzam, Noura, Rafal Rakowski, Marius Kaucikas, et al. "Femtosecond visible transient absorption spectroscopy of chlorophyll-f-containing photosystem II." Proceedings of the National Academy of Sciences 117, no. 37 (2020): 23158–64. http://dx.doi.org/10.1073/pnas.2006016117.

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The recently discovered, chlorophyll-f-containing, far-red photosystem II (FR-PSII) supports far-red light photosynthesis. Participation and kinetics of spectrally shifted far-red pigments are directly observable and separated from that of bulk chlorophyll-a. We present an ultrafast transient absorption study of FR-PSII, investigating energy transfer and charge separation processes. Results show a rapid subpicosecond energy transfer from chlorophyll-a to the long-wavelength chlorophylls-f/d. The data demonstrate the decay of an ∼720-nm negative feature on the picosecond-to-nanosecond timescale

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Chen, Min, Martin Schliep, Robert D. Willows, Zheng-Li Cai, Brett A. Neilan, and Hugo Scheer. "A Red-Shifted Chlorophyll: Fig. 1." Science 329, no. 5997 (2010): 1318–19. http://dx.doi.org/10.1126/science.1191127.

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Chlorophylls are essential for light-harvesting and energy transduction in photosynthesis. Four chemically distinct varieties have been known for the past 60 years. Here we report isolation of a fifth, which we designate chlorophyll f. Its in vitro absorption (706 nanometers) and fluorescence (722 nanometers) maxima are red-shifted compared to all other chlorophylls from oxygenic phototrophs. On the basis of the optical, mass, and nuclear magnetic resonance spectra, we propose that chlorophyll f is [2-formyl]-chlorophyll a (C55H70O6N4Mg). This finding suggests that oxygenic photosynthesis can

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4

Gacek, Daniel A., Alexander Betke, Julia Nowak, Heiko Lokstein, and Peter J. Walla. "Two-photon absorption and excitation spectroscopy of carotenoids, chlorophylls and pigment–protein complexes." Physical Chemistry Chemical Physics 23, no. 14 (2021): 8731–38. http://dx.doi.org/10.1039/d1cp00656h.

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Comparing carotenoid and chlorophyll two-photon spectra with that of light harvesting complexes shows the latter consist of both. Depending on the two-photon excitation (TPE) wavelength, mainly carotenoid dark states or chlorophylls can be excited.

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Guo, Hai Rong, Shao Ying Ma, Xiao Fei Wang, Er Fang Ren, and Yuan Yuan Li. "Microwave-Assisted Extraction of Chlorophyll from Filter Mud of Sugercane Mill and Component Analysis." Advanced Materials Research 518-523 (May 2012): 430–35. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.430.

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Microwave-assisted extraction (MAE) was used to extract chlorophylls from filter mud. Ethanol was used as the solvent. The optimal conditions for the MAE of chlorophylls were concluded from the study as the irradiation time, 50 s, the ratio of liquid to solid, 8:1 (mL/g), the extraction temperature, 40 °C, and the extraction time, 60 min. Compared with conventional extraction, the MAE of chlorophylls from the filter mud was more effective. The extraction time for MAE was 60 min with 0.277 mg/g chlorophyll yield, while conventional extraction needed 240 min with only about 0.259 mg/g chlorophyl

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6

Yang, Yu Jie, Bi Ru Hu, Zhi Ming Liu, and Wen Jian Wu. "Preparation of Photostable Chlorophyll/PVA Film." Advanced Materials Research 239-242 (May 2011): 2707–10. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2707.

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Based on the principle that chlorophyll’s photodegradation occurs in the presence of oxygen, high-oxygen-barrier polyvinyl alcohol (PVA) films comprising chlorophyll are prepared without photodegradation of chlorophyll by a facile procedure. The photostability of the films are characterized by the absorption spectra. The result shows that the chlorophyll in the films can keep photostable at least for six months whereas the photostability of chlorophyll in ethanol is less than one day. The absorption maxima of chlorophyll/PVA films at red band, which are at 668nm due to the chlorophyll and cons

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7

Wagner, W. D., and W. Waidelich. "Selective Observation of Chlorophyll c in Whole Cells of Diatoms by Resonant Raman Spectroscopy." Applied Spectroscopy 40, no. 2 (1986): 191–96. http://dx.doi.org/10.1366/0003702864509574.

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A surface scanning technique was used to obtain resonant Raman spectra from chlorophylls in solution and in whole cells of diatoms at 80 K. When in vivo samples are excited at 457.9 nm, chlorophyll c becomes observable in the recorded Raman spectra, as shown by comparison with in vitro measurements. In the field of photosynthetic research this becomes Interesting, as chlorophyll c can hardly be detected in electronic absorption spectra from whole cells, even at low temperatures, because of its weak Q bands compared with other plant chlorophylls. Chl a spectra were obtained with the use of 441.

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8

Siebke, Katharina, and Marilyn C. Ball. "Non-destructive measurement of chlorophyll b:a ratios and identification of photosynthetic pathways in grasses by reflectance spectroscopy." Functional Plant Biology 36, no. 11 (2009): 857. http://dx.doi.org/10.1071/fp09201.

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Equations for non-destructive determination of chlorophyll b : a ratios in grasses were developed from reflectance spectra of intact leaves of barley (Hordeum vulgare L.) and two barley mutants: clorina f2, which lacks chlorophyll b and clorina f104, which has a low chlorophyll b content. These plants enabled separation of effects of chlorophyll composition on reflectance spectra due to differential light absorption by chlorophylls a and b and to measure the effects of chlorophyll b on the contribution of fluorescence emitted by chlorophyll a to the reflectance spectra. Indices developed from

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9

Liu, Ji-Feng. "Theoretical reconsideration on the hydrogen bonding and coordination interactions of chlorophyll a in aqueous solution." Journal of Porphyrins and Phthalocyanines 15, no. 03 (2011): 202–10. http://dx.doi.org/10.1142/s1088424611003148.

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In the present work, explicit water molecule and solvent-field effects on the absorption spectrum of chlorophyll a have been studied using time-dependent density functional theory (TDDFT) method. Calculated results show that the one complex and two water coordinated complexes formed by concerted coordination and hydrogen-bonding interactions would be the most preferable conformations of chlorophyll a in aqueous surroundings. Moreover, four obvious absorption bands are assigned by comparing the theoretically simulated absorption spectra with the experimental ones. The theoretical study shows th

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10

Yusprianto, Muhammad, Titin Anita Zaharah, and Imelda Hotmarisi Silalahi. "Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺)." Jurnal Kimia Sains dan Aplikasi 24, no. 4 (2021): 126–35. http://dx.doi.org/10.14710/jksa.24.4.126-135.

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The bandgap energy (Egap) of TiO2 material modified with metal-chlorophyll complex compounds (M = Cu2+, Fe3+) was observed. Chlorophyll (Chl) was isolated from cassava leaves, and its UV-Vis spectra showed absorption peaks in the Soret band region (410 nm) and in the Q band region (665 nm), which is the typical peak of chlorophyll. Copper(II)-chlorophyll complex was prepared from the reaction between chlorophyll and CuSO4.5H2O, while the iron(III)-chlorophyll was synthesized from chlorophyll and FeCl3.6H2O in methanol solvent under reflux at 65°C. The presence of copperand iron metals in the c

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Dissertations / Theses on the topic "Absorption spectra. Chlorophyll"

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Nuñez, Argel Nasir Sosa. "Estudo teórico da espectroscopia da clorofila d." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19112017-173908/.

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Neste trabalho estudamos o espectro de absorção da clorofila d, incluindo os efeitos do solvente metanol, utilizando a Teoria do Funcional da Densidade Dependente do Tempo em combinação com o método s-QM/MM. Diferentes abordagens para a descrição do meio solvente, que vão desde o modelo contínuo polarizável até a inclusão de moléculas explícitas do solvente, são utilizadas. Observamos que a inclusão do solvente desloca o espectro, em relação ao calculado em vácuo, para o vermelho. A inclusão de 20 moléculas explícitas de metanol e 880 representadas como as cargas pontuais do seus átomos para a

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Books on the topic "Absorption spectra. Chlorophyll"

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Brennan, D. Development of an instrument to measure chlorophyll content in water samples. University College Dublin, 1996.

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2

Carder, Kendall L. Algorithm-development activities: Quarterly report for July - December, 1993; semi-annual report, January 15, 1994. National Aeronautics and Space Administration, 1994.

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3

Carder, Kendall L. Algorithm-development activities: Quarterly report for July - December, 1993; semi-annual report, January 15, 1994. National Aeronautics and Space Administration, 1994.

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4

Carder, Kendall L. Algorithm-development activities: Quarterly report for July - December, 1993; semi-annual report, January 15, 1994. National Aeronautics and Space Administration, 1994.

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Book chapters on the topic "Absorption spectra. Chlorophyll"

1

Van Gurp, Marnix, Gijs Van Ginkel, and Yehudi K. Levine. "Spectral Resolution of the Absorption and Emission Transitions of Chlorophylls." In Current Research in Photosynthesis. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_303.

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2

Zucchelli, Giuseppe, Flavio M. Garlaschi, Laura Finzi, and Robert C. Jennings. "A Thermal Broadening Analysis of the Light Harvesting Chlorophyll a/b Complex II Absorption Spectrum in Terms of Sub-Bands." In Photosynthesis: from Light to Biosphere. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_40.

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3

Perry, Mary Jane. "Measurements of Phytoplankton Absorption Other Than Per Unit of Chlorophyll a." In Ocean Optics. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195068436.003.0010.

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Phytoplankton plays a critical role in determining light fields of the world’s oceans, primarily through absorption of light by photosynthetic pigments (see Chapters 1 to 5). Consequently there has been considerable interest from optical researchers in determining phytoplankton absorption. Conversely, from the biological point of view, this absorption assumes paramount importance because it is the sole source of energy for photosynthesis and thus should be central to direct estimates of primary production. There are two logical parts in determining this effect of phytoplankton and in estimating primary production. One is the estimation of abundance, and the other is estimation of specific effect or specific production rate. The earliest estimates of phytoplankton abundance were based on cell counts. From the time of Francis A. Richards’ Ph.D. dissertation, however, measurement of chlorophyll a concentration per unit of water volume, because of its relative ease, has assumed a central role in abundance estimation. Physiological studies and technological advances in optical instrumentation over the last decade lead me to question whether the continued use of chlorophyll a concentration to estimate phytoplankton abundance was wise either from the viewpoint of narrowing confidence intervals on estimates of absorption and production or from the viewpoint of mechanistic understanding of the processes involved. The measurement of chlorophyll a has become such a routine tool of biological oceanography, however, that the reasons for my heresy require elaboration. Some of the reasons are not too subtle. Chlorophyll a exists with other photosynthetic pigments in organized arrays associated with photosynthetic membranes. The function of these arrays is to harvest photons and transfer their energy to the specialized reaction center complexes that mediate photochemistry (see Chapter 9). The size of the arrays or packages and the ratio of chlorophyll a molecules to other light-harvesting pigments within the packages vary with phytoplankton cell size, total irradiance and its spectral distribution, as well as with other environmental parameters. It is well known that dark-adapted (= light-limited) cells increase their complements of photopigments. This plasticity in pigment packaging is evidenced in the variability of chlorophyll a-specific absorption coefficients. Simple optical models based only on chlorophyll a concentrations cannot be accurate or precise unless the effects of pigment packaging are considered.

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Conference papers on the topic "Absorption spectra. Chlorophyll"

1

Berberog˘lu, Halil, Pedro S. Gomez, and Laurent Pilon. "Radiation Characteristics of Promising Algae for CO2 Fixation and Biofuel Production." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88019.

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This paper reports experimental measurements of the radiation characteristics of green algae used for carbon dioxide fixation via photosynthesis. Particular attention was paid to three widely used species namely Botryococcus braunii, Chlorella sp., and Chlorococcum littorale. Their extinction and absorption coefficients were obtained from normal-normal and normal-hemispherical transmittance measurements over the spectral range from 400 to 800 nm. Moreover, a polar nephelometer is used to measure the scattering phase function of the microorganisms at 632.8 nm. It was observed that for all strai

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2

Correa, D. S., L. De Boni, F. J. Pavinatto, D. S. dos Santos, and C. R. Mendonca. "Excited state absorption cross-section spectrum of Chlorophyll A." In 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431217.

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3

Correa, D. S., L. De Boni, F. J. Pavinatto, D. S. dos Santos, and C. R. Mendonca. "Excited state absorption cross-section spectrum of Chlorophyll A." In CLEO 2007. IEEE, 2007. http://dx.doi.org/10.1109/cleo.2007.4453440.

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4

Berberoglu, Halil, Laurent Pilon, and Anastasios Melis. "Radiation Characteristics of Chlamydomonas Reinhardtii and Its Genetically Engineered Strains With Less Chlorophyll Pigments." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42986.

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Photobiological hydrogen production is a sustainable alternative to thermo-chemical and electrolytic technologies with the added advantage of carbon dioxide mitigation. However, the scale-up of this technology from bench top to mass culture in industrial photobioreactors suffers from low solar-to-chemical conversion efficiency and irradiance transmittance limitations. In order to overcome these challenge, algae such as Chlamydomonas reinhardtii, can be genetically engineered to have reduced pigment concentrations in their photosystems. Thus, algae do not absorb more light than they can utilize

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Wang, Xiaoping, Ni Guo, Kai Zhang, and Hong Zhao. "Estimation of the spring wheat water and chlorophyll content in rainfed agriculture areas of the Loess Plateau based on the spectral absorption feature of the liquid water and chlorophyll." In Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Classification of Remote Sensing Images, edited by Lin Liu, Xia Li, Kai Liu, and Xinchang Zhang. SPIE, 2008. http://dx.doi.org/10.1117/12.813252.

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