Abstract:
:The Soret absorption spectra of six synthetic rigid porphyrin dimers whose crystal structures have been determined are simulated using simple exciton theory. The objective is to test the validity of the point dipole and associated approximations; the electronic interaction parameters are thus calculated using data obtained from the monomer spectra, with no adjustable parameters. Satisfactory agreement between theory and experiment is obtained for one class of dimers but not for a second. This poses a challenge for semiempirical electronic structure methods as to whether improvements over the point dipole calculations can be obtained.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Won Y,Friesner RA,Johnson MR,Sessler JLdoi
10.1007/BF00048299subject
Has Abstractpub_date
1989-12-01 00:00:00pages
201-10issue
3eissn
0166-8595issn
1573-5079journal_volume
22pub_type
杂志文章abstract::The 3- and 7-formyl groups of chlorophyll-d (Chl-d) and bacteriochlorophyll-e (BChl-e), respectively, were regioselectively labeled with an isotopically stable oxygen-18 (¹⁸O) atom to give 3¹-¹⁸O-labeled Chl-d and 7¹-¹⁸O-labeled BChl-e (ca. 90% ¹⁸O) by exchanging the carbonyl oxygen atoms in the presence of acidic H₂ ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-010-9590-4
更新日期:2010-09-01 00:00:00
abstract::Tropical plants are sensitive to chilling temperatures above zero but it is still unclear whether photosystem I (PSI) or photosystem II (PSII) of tropical plants is mainly affected by chilling temperatures. In this study, the effect of 4 degrees C associated with various light densities on PSII and PSI was studied in ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-010-9539-7
更新日期:2010-03-01 00:00:00
abstract::Minimal photosynthetic catalytic F1(αβ) core complexes, containing equimolar ratios of the α and β subunits, were isolated from membrane-bound spinach chloroplast CF1 and Rhodospirillum rubrum chromatophore RrF1. A CF1-α3β3 hexamer and RrF1-α1β1 dimer, which were purified from the respective F1(αβ) complexes, exhibit ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00020418
更新日期:1995-11-01 00:00:00
abstract::Triplet state electron paramagnetic resonance (EPR) experiments have been carried out at X-band on Rb. sphaeroides R-26 reaction centers that have been reconstituted with the carotenoid, spheroidene, and exchanged with 13(2)-OH-Zn-bacteriochlorophyll a and [3-vinyl]-13(2)-OH-bacteriochlorophyll a at the monomeric, 'ac...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032823
更新日期:1993-09-01 00:00:00
abstract::Acaryochloris marina is a unique cyanobacterium that contains chlorophyll (Chl) d as a major pigment. Because Chl d has smaller excitation energy than Chl a used in ordinary photosynthetic organisms, the energetics of the photosystems of A. marina have been the subject of interest. It was previously shown that the red...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-014-0073-x
更新日期:2015-08-01 00:00:00
abstract::Water vapor was added differentially to the gas streams entering the cells of three makes of differential infrared carbon dioxide analysers. Analyser deflections were compared with those expected from dilution of the carbon dioxide by the additional gas. Tests were made at 0, 365, and 730 cm(3) m(-3) concentrations of...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00054104
更新日期:1985-12-01 00:00:00
abstract::Chlorophyll (Chl) b serves an essential function in accumulation of light-harvesting complexes (LHCs) in plants. In this article, this role of Chl b is explored by considering the properties of Chls and the ligands with which they interact in the complexes. The overall properties of the Chls, not only their spectral f...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-007-9181-1
更新日期:2007-11-01 00:00:00
abstract::Photoacclimation by strains of Haslea "blue" diatom species H. ostrearia and H. silbo sp. nov. ined. was investigated with rapid light curves and induction-recovery curves using fast repetition rate fluorescence. Cultures were grown to exponential phase under 50 µmol m-2 s-1 photosynthetic available radiation (PAR) an...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-018-0508-x
更新日期:2018-09-01 00:00:00
abstract::In thylakoid membranes, several peptides of high MW† are present which may interfere with the study of CP1's components. Modifying Cleveland's technique [7] for limited proteolysis, we have characterized the polypeptides found in the 60 kD region. Some may result from incomplete washing of the CF1 while others come fr...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00020071
更新日期:1980-03-01 00:00:00
abstract::The storage of light energy in chemical form through photosynthesis is the key process underlying life as we know it. To utilize photosynthates efficiently as structural materials or as fuel to drive endergonic processes, they have to be transported from where they are produced to where they are needed. In this primer...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-013-9867-5
更新日期:2013-11-01 00:00:00
abstract::The current study confirmed earlier conclusions regarding differential ozone (O(3)) tolerances of two soybean cultivars, Essex and Forrest, and evaluated antioxidant enzyme activities of these two varieties based on their performance under environmentally relevant, elevated O(3) conditions. The experiment was conducte...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1026500911237
更新日期:2000-01-01 00:00:00
abstract::Mike Wasielewski's pioneering work on Photosystem II photochemistry has an important place in the history of photosynthesis; we are proud to have been associated with him in making those first measurements. Here, we present our association and publications with him, and provide some of the history behind this research...
journal_title:Photosynthesis research
pub_type: 传,历史文章,杂志文章
doi:10.1007/s11120-009-9505-4
更新日期:2010-01-01 00:00:00
abstract::By recording leaf transmittance at 820 nm and quantifying the photon flux density of far red light (FRL) absorbed by long-wavelength chlorophylls of Photosystem I (PS I), the oxidation kinetics of electron carriers on the PS I donor side was mathematically analyzed in sunflower (Helianthus annuus L.), tobacco (Nicotia...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1026070612022
更新日期:2003-01-01 00:00:00
abstract::A simple approach to determine CO2/O2 specificity factor (τ) of ribulose 1,5-bisphosphate carboxylase/oxygenase is described. The assay measures the amount of CO2 fixation at varying [CO2]/[O2] ratios after complete consumption of ribulose 1,5-bisphosphate (RuBP). Carbon dioxide fixation catalyzed by the carboxylase w...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029463
更新日期:1995-01-01 00:00:00
abstract::This concise review describes the current status of research into how carotenoids function in bacterial photosynthesis. This is illustrated by reference to very recent studies on both the photoprotective and antenna functions of carotenoids. The major remaining open questions on the detailed molecular mechanisms invol...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1014715114520
更新日期:2001-01-01 00:00:00
abstract::Light-induced reaction dynamics of isolated photosynthetic membranes obtained from wild-type (WT) and reaction center (RC)-subunit deletion strains SPUHK1 (an H-subunit deletion mutant) and SK Delta LM (an (L+M) deletion mutant) of the purple non-sulphur bacterium Rhodospirillum rubrum have been investigated by femtos...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-009-9520-5
更新日期:2010-03-01 00:00:00
abstract::We have compared the properties of a mutant of barley lacking Photosystem I (viridis-zb (63) ) with the corresponding wild type using modulated fluorescence measurements. The mutant showed two unexpected characteristics. Firstly, there was a slow decline in the fluorescence signal in the light which was dependent on t...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00016561
更新日期:1993-03-01 00:00:00
abstract::In this paper we compared the pigment composition, photochemical activity, chloroplast ultrastructure, thylakoid membrane polypeptide composition and ribosomal content of wild-type and seven light-sensitive mutants of Chlamydomonas reinhardii.All the mutants had low chlorophyll and carotenoid content compared to wild-...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032261
更新日期:1982-01-01 00:00:00
abstract::A time line of important research relating to anoxygenic photosynthetic organisms is presented. The time line includes discoveries of organisms, metabolic capabilities, molecular complexes and genetic systems. It also pinpoints important milestones in our understanding of the structure, function, organization, assembl...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000030448.24695.ec
更新日期:2004-01-01 00:00:00
abstract::Recently, a number of techniques, some of them relatively new and many often used in combination, have given a clearer picture of the dynamic role of electron transport in Photosystem I of photosynthesis and of coupled cyclic photophosphorylation. For example, the photoacoustic technique has detected cyclic electron t...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033035
更新日期:1993-06-01 00:00:00
abstract::In many ways, the 1963 conference at Airlie House was an unusual event. The meeting convincingly demonstrated that photosynthetic research, previously reported mostly at conferences of botany and/or plant physiology, had become an independent and important field of biological research. New techniques had been develope...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/B:PRES.0000030427.35645.5c
更新日期:2004-01-01 00:00:00
abstract::A spontaneous mutant (R/89) of photosynthetic purple bacterium Rhodobacter sphaeroides R-26 was selected for resistance to 200 μM atrazin. It showed increased resistance to interquinone electron transfer inhibitors of o-phenanthroline (resistance factor, RF=20) in UQo reconstituted isolated reaction centers and terbut...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032585
更新日期:1995-08-01 00:00:00
abstract::Cyanobacteria, algae, and plants produce dioxygen from water. Driven and clocked by light quanta, the catalytic Mn(4)Ca Tyrosine centre accumulates four oxidizing equivalents before it abstracts four electrons from water and liberates dioxygen and protons. Intermediates of this reaction cascade are short-lived (<100 m...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-008-9321-2
更新日期:2008-10-01 00:00:00
abstract::The electron transport rates of photosystems II and I, amounts of electron carriers, coupling factor activity and photosynthetic rates were investigated in thylakoids isolated from pea plants grown under a wide range of light intensities (16 h light-8 h dark). The electron transport rates of PS II and PS I, as partial...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028525
更新日期:1984-06-01 00:00:00
abstract::MOA-stilbene is known to be a specific inhibitor of the Qo site of mammalian cytochrome bc 1 complex. We show that it also binds to the chloroplast cytochrome bf complex. Binding to the reduced enzyme induces a red-shift of the Soret and visible absorption bands of the haems b. Steady state and single turnover experim...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029819
更新日期:1992-12-01 00:00:00
abstract::The chlorophyll content is an important experimental parameter in agronomy and plant biology research. In this report, we explore the feasibility of determining total concentration of extracts containing chlorophyll a and chlorophyll b by chlorophyll fluorescence. We found that an excitation at 457 nm results in the s...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-012-9777-y
更新日期:2012-10-01 00:00:00
abstract::A proton electrochemical potential across the membranes of photosynthetic purple bacteria is established by a light-driven proton pump mechanism: the absorbed light in the reaction center initiates electron transfer which is coupled to the vectorial displacement of protons from the cytoplasm to the periplasm. The stoi...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF02185435
更新日期:1993-07-01 00:00:00
abstract::Heliobacteria are a recently discovered group of anoxygenic phototrophic bacteria, first described in 1983. Heliobacteria contain bacteriochlorophyll g, a pigment unique to species of this group, and synthesize the simplest photosynthetic complexes of all known phototrophs. Also, unlike all other phototrophs, heliobac...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-009-9516-1
更新日期:2010-06-01 00:00:00
abstract::The effect of desiccation and rehydration on the function of Photosystem II has been studied in the desiccation tolerant lichen Cladonia convoluta by thermoluminescence. We have shown that in functional fully hydrated thalli thermoluminescence signals can be observed from the recombination of the S2(3)QB (-) (B band),...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00041010
更新日期:1996-05-01 00:00:00
abstract::A short list of the twentieth century's dominant figures in photosynthesis would unquestionably include Otto Warburg. One of his many discoveries, the 'bicarbonate effect' remains a lasting puzzle to his heirs in the field. Recent developments in this area of research have renewed interest and call for a re-examinatio...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1020447030191
更新日期:2002-01-01 00:00:00