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Artykuły w czasopismach na temat „Photosynthetic bacteria”

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Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 1 sierpnia 2024

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1

Hu, Xiche, Thorsten Ritz, Ana Damjanović, Felix Autenrieth i Klaus Schulten. "Photosynthetic apparatus of purple bacteria". Quarterly Reviews of Biophysics 35, nr 1 (luty 2002): 1–62. http://dx.doi.org/10.1017/s0033583501003754.

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1. Introduction 22. Structure of the bacterial PSU 52.1 Organization of the bacterial PSU 52.2 The crystal structure of the RC 92.3 The crystal structures of LH-II 112.4 Bacteriochlorophyll pairs in LH-II and the RC 132.5 Models of LH-I and the LH-I-RC complex 152.6 Model for the PSU 173. Excitation transfer in the PSU 183.1 Electronic excitations of BChls 22 3.1.1 Individual BChls 22 3.1.2 Rings of BChls 22 3.1.2.1 Exciton states 22 3.1.3 Effective Hamiltonian 24 3.1.4 Optical properties 25 3.1.5 The effect of disorder 263.2 Theory of excitation transfer 29 3.2.1 General theory 29 3.2.2 Mechanisms of excitation transfer 32 3.2.3 Approximation for long-range transfer 34 3.2.4 Transfer to exciton states 353.3 Rates for transfer processes in the PSU 37 3.3.1 Car→BChl transfer 37 3.3.1.1 Mechanism of Car→BChl transfer 39 3.3.1.2 Pathways of Car→BChl transfer 40 3.3.2 Efficiency of Car→BChl transfer 40 3.3.3 B800-B850 transfer 44 3.3.4 LH-II→LH-II transfer 44 3.3.5 LH-II→LH-I transfer 45 3.3.6 LH-I→RC transfer 45 3.3.7 Excitation migration in the PSU 46 3.3.8 Genetic basis of PSU assembly 494. Concluding remarks 535. Acknowledgments 556. References 55Life as we know it today exists largely because of photosynthesis, the process through which light energy is converted into chemical energy by plants, algae, and photosynthetic bacteria (Priestley, 1772; Barnes, 1893; Wurmser, 1925; Van Niel, 1941; Clayton & Sistrom, 1978; Blankenship et al. 1995; Ort & Yocum, 1996). Historically, photosynthetic organisms are grouped into two classes. When photosynthesis is carried out in the presence of air it is called oxygenic photosynthesis (Ort & Yocum, 1996). Otherwise, it is anoxygenic (Blankenship et al. 1995). Higher plants, algae and cyanobacteria perform oxygenic photosynthesis, which involves reduction of carbon dioxide to carbohydrate and oxidation of water to produce molecular oxygen. Some photosynthetic bacteria, such as purple bacteria, carry out anoxygenic photosynthesis that involves oxidation of molecules other than water. In spite of these differences, the general principles of energy transduction are the same in anoxygenic and oxygenic photosynthesis (Van Niel, 1931, 1941; Stanier, 1961; Wraight, 1982; Gest, 1993). The primary processes of photosynthesis involve absorption of photons by light-harvesting complexes (LHs), transfer of excitation energy from LHs to the photosynthetic reaction centers (RCs), and the primary charge separation across the photosynthetic membrane (Sauer, 1975; Knox, 1977; Fleming & van Grondelle, 1994; van Grondelle et al. 1994). In this article, we will focus on the anoxygenic photosynthetic process in purple bacteria, since its photosynthetic system is the most studied and best characterized during the past 50 years.
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Kushkevych, Ivan, Jiří Procházka, Márió Gajdács, Simon K. M. R. Rittmann i Monika Vítězová. "Molecular Physiology of Anaerobic Phototrophic Purple and Green Sulfur Bacteria". International Journal of Molecular Sciences 22, nr 12 (15.06.2021): 6398. http://dx.doi.org/10.3390/ijms22126398.

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There are two main types of bacterial photosynthesis: oxygenic (cyanobacteria) and anoxygenic (sulfur and non-sulfur phototrophs). Molecular mechanisms of photosynthesis in the phototrophic microorganisms can differ and depend on their location and pigments in the cells. This paper describes bacteria capable of molecular oxidizing hydrogen sulfide, specifically the families Chromatiaceae and Chlorobiaceae, also known as purple and green sulfur bacteria in the process of anoxygenic photosynthesis. Further, it analyzes certain important physiological processes, especially those which are characteristic for these bacterial families. Primarily, the molecular metabolism of sulfur, which oxidizes hydrogen sulfide to elementary molecular sulfur, as well as photosynthetic processes taking place inside of cells are presented. Particular attention is paid to the description of the molecular structure of the photosynthetic apparatus in these two families of phototrophs. Moreover, some of their molecular biotechnological perspectives are discussed.
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3

Alif, Trisnani, Putri Ayu Ika Setiyowati, Aisyah Hadi Ramadani, Inayah Fitri i Dyah Ayu Sri Hartanti. "Pemberdayaan Kelompok Tani dalam Pemanfaatan Bakteri Fotosintesis sebagai Pupuk Nabati pada Tanaman Padi". TAAWUN 3, nr 01 (2.02.2023): 41–48. http://dx.doi.org/10.37850/taawun.v3i01.335.

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The use of anorganic fertilizers is most popular among farmers, the lack of subsidies from the government for anorganic fertilizers so that the scarcity of fertilizers becomes important problem for farmers. The purpose of this activity is to assist farmers in the use of photosynthetic bacteria as fertilizers for plants. The method used is in the form of counseling, and mentoring in the practice of cultivated bacterial photosynthesis for application in fields. The results of the activities showed that before the training the majority of trainees (82.5%) did not know and understand photosynthetic bacterial fertilizers, after training the majority of trainees (80.4%) knew and understood, and were skilled in making and using photosynthetic bacteria. Participation and enthusiasm were shown by the participants during the activity.
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4

Gest, Howard. "Photosynthetic and quasi-photosynthetic bacteria". FEMS Microbiology Letters 112, nr 1 (sierpień 1993): 1–5. http://dx.doi.org/10.1111/j.1574-6968.1993.tb06414.x.

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5

Imhoff, Johannes F., Tanja Rahn, Sven Künzel i Sven C. Neulinger. "Phylogeny of Anoxygenic Photosynthesis Based on Sequences of Photosynthetic Reaction Center Proteins and a Key Enzyme in Bacteriochlorophyll Biosynthesis, the Chlorophyllide Reductase". Microorganisms 7, nr 11 (19.11.2019): 576. http://dx.doi.org/10.3390/microorganisms7110576.

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Photosynthesis is a key process for the establishment and maintenance of life on earth, and it is manifested in several major lineages of the prokaryote tree of life. The evolution of photosynthesis in anoxygenic photosynthetic bacteria is of major interest as these have the most ancient roots of photosynthetic systems. The phylogenetic relations between anoxygenic phototrophic bacteria were compared on the basis of sequences of key proteins of the type-II photosynthetic reaction center, including PufLM and PufH (PuhA), and a key enzyme of bacteriochlorophyll biosynthesis, the light-independent chlorophyllide reductase BchXYZ. The latter was common to all anoxygenic phototrophic bacteria, including those with a type-I and those with a type-II photosynthetic reaction center. The phylogenetic considerations included cultured phototrophic bacteria from several phyla, including Proteobacteria (138 species), Chloroflexi (five species), Chlorobi (six species), as well as Heliobacterium modesticaldum (Firmicutes), Chloracidobacterium acidophilum (Acidobacteria), and Gemmatimonas phototrophica (Gemmatimonadetes). Whenever available, type strains were studied. Phylogenetic relationships based on a photosynthesis tree (PS tree, including sequences of PufHLM-BchXYZ) were compared with those of 16S rRNA gene sequences (RNS tree). Despite some significant differences, large parts were congruent between the 16S rRNA phylogeny and photosynthesis proteins. The phylogenetic relations demonstrated that bacteriochlorophyll biosynthesis had evolved in ancestors of phototrophic green bacteria much earlier as compared to phototrophic purple bacteria and that multiple events independently formed different lineages of aerobic phototrophic purple bacteria, many of which have very ancient roots. The Rhodobacterales clearly represented the youngest group, which was separated from other Proteobacteria by a large evolutionary gap.
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6

Stanier, G. "Green photosynthetic bacteria". Annales de l'Institut Pasteur / Microbiologie 139, nr 6 (listopad 1988): 734–35. http://dx.doi.org/10.1016/0769-2609(88)90085-3.

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7

Knaff, David B. "Anoxygenic photosynthetic bacteria". Photosynthesis Research 47, nr 2 (luty 1996): 199–200. http://dx.doi.org/10.1007/bf00016182.

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8

Achenbach, Laurie A., Jennifer Carey i Michael T. Madigan. "Photosynthetic and Phylogenetic Primers for Detection of Anoxygenic Phototrophs in Natural Environments". Applied and Environmental Microbiology 67, nr 7 (1.07.2001): 2922–26. http://dx.doi.org/10.1128/aem.67.7.2922-2926.2001.

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ABSTRACT Primer sets were designed to target specific 16S ribosomal DNA (rDNA) sequences of photosynthetic bacteria, including the green sulfur bacteria, the green nonsulfur bacteria, and the members of theHeliobacteriaceae (a gram-positive phylum). Due to the phylogenetic diversity of purple sulfur and purple nonsulfur phototrophs, the 16S rDNA gene was not an appropriate target for phylogenetic rDNA primers. Thus, a primer set was designed that targets the pufM gene, encoding the M subunit of the photosynthetic reaction center, which is universally distributed among purple phototrophic bacteria. The pufM primer set amplified DNAs not only from purple sulfur and purple nonsulfur phototrophs but also from Chloroflexus species, which also produce a reaction center like that of the purple bacteria. Although the purple bacterial reaction center structurally resembles green plant photosystem II, the pufM primers did not amplify cyanobacterial DNA, further indicating their specificity for purple anoxyphototrophs. This combination of phylogenetic- and photosynthesis-specific primers covers all groups of known anoxygenic phototrophs and as such shows promise as a molecular tool for the rapid assessment of natural samples in ecological studies of these organisms.
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9

Yurkov, Vladimir V., i J. Thomas Beatty. "Aerobic Anoxygenic Phototrophic Bacteria". Microbiology and Molecular Biology Reviews 62, nr 3 (1.09.1998): 695–724. http://dx.doi.org/10.1128/mmbr.62.3.695-724.1998.

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SUMMARY The aerobic anoxygenic phototrophic bacteria are a relatively recently discovered bacterial group. Although taxonomically and phylogenetically heterogeneous, these bacteria share the following distinguishing features: the presence of bacteriochlorophyll a incorporated into reaction center and light-harvesting complexes, low levels of the photosynthetic unit in cells, an abundance of carotenoids, a strong inhibition by light of bacteriochlorophyll synthesis, and the inability to grow photosynthetically under anaerobic conditions. Aerobic anoxygenic phototrophic bacteria are classified in two marine (Erythrobacter and Roseobacter) and six freshwater (Acidiphilium, Erythromicrobium, Erythromonas, Porphyrobacter, Roseococcus, and Sandaracinobacter) genera, which phylogenetically belong to the α-1, α-3, and α-4 subclasses of the class Proteobacteria. Despite this phylogenetic information, the evolution and ancestry of their photosynthetic properties are unclear. We discuss several current proposals for the evolutionary origin of aerobic phototrophic bacteria. The closest phylogenetic relatives of aerobic phototrophic bacteria include facultatively anaerobic purple nonsulfur phototrophic bacteria. Since these two bacterial groups share many properties, yet have significant differences, we compare and contrast their physiology, with an emphasis on morphology and photosynthetic and other metabolic processes.
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10

Ward, Lewis M., i Patrick M. Shih. "Granick revisited: Synthesizing evolutionary and ecological evidence for the late origin of bacteriochlorophyll via ghost lineages and horizontal gene transfer". PLOS ONE 16, nr 1 (28.01.2021): e0239248. http://dx.doi.org/10.1371/journal.pone.0239248.

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Photosynthesis—both oxygenic and more ancient anoxygenic forms—has fueled the bulk of primary productivity on Earth since it first evolved more than 3.4 billion years ago. However, the early evolutionary history of photosynthesis has been challenging to interpret due to the sparse, scattered distribution of metabolic pathways associated with photosynthesis, long timescales of evolution, and poor sampling of the true environmental diversity of photosynthetic bacteria. Here, we reconsider longstanding hypotheses for the evolutionary history of phototrophy by leveraging recent advances in metagenomic sequencing and phylogenetics to analyze relationships among phototrophic organisms and components of their photosynthesis pathways, including reaction centers and individual proteins and complexes involved in the multi-step synthesis of (bacterio)-chlorophyll pigments. We demonstrate that components of the photosynthetic apparatus have undergone extensive, independent histories of horizontal gene transfer. This suggests an evolutionary mode by which modular components of phototrophy are exchanged between diverse taxa in a piecemeal process that has led to biochemical innovation. We hypothesize that the evolution of extant anoxygenic photosynthetic bacteria has been spurred by ecological competition and restricted niches following the evolution of oxygenic Cyanobacteria and the accumulation of O2 in the atmosphere, leading to the relatively late evolution of bacteriochlorophyll pigments and the radiation of diverse crown group anoxygenic phototrophs. This hypothesis expands on the classic “Granick hypothesis” for the stepwise evolution of biochemical pathways, synthesizing recent expansion in our understanding of the diversity of phototrophic organisms as well as their evolving ecological context through Earth history.
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11

Jockers, R., i R. D. Schmid. "Synthesis of Long-Chain Triazine Aldehydes - Substrates of Bacterial Luciferase and Photosynthetic Inhibitors". Zeitschrift für Naturforschung C 47, nr 7-8 (1.08.1992): 573–79. http://dx.doi.org/10.1515/znc-1992-7-814.

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S-triazines are photosynthetic inhibitors. They have been substituted with ω-aminoundecanoic acid. The coupling products have been transformed into triazine aldehydes. These compounds displace radioactive terbutryn and have inhibitory effects on photosynthesis in plants and bacteria. Triazine aldehydes were shown to be effective substrates for bacterial luciferase. A competitive assay between photosystem-II-herbicides and aldehyde-labeled triazines is discussed.
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12

Gest, Howard. "A microbiologist's odyssey: Bacterial viruses to photosynthetic bacteria". Photosynthesis Research 40, nr 2 (maj 1994): 129–46. http://dx.doi.org/10.1007/bf00019331.

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13

Cheng, Ju-E., Pin Su, Zhan-Hong Zhang, Li-Min Zheng, Zhong-Yong Wang, Muhammad Rizwan Hamid, Jian-Ping Dai i in. "Metagenomic analysis of the dynamical conversion of photosynthetic bacterial communities in different crop fields over different growth periods". PLOS ONE 17, nr 7 (14.07.2022): e0262517. http://dx.doi.org/10.1371/journal.pone.0262517.

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Photosynthetic bacteria are beneficial to plants, but knowledge of photosynthetic bacterial community dynamics in field crops during different growth stages is scarce. The factors controlling the changes in the photosynthetic bacterial community during plant growth require further investigation. In this study, 35 microbial community samples were collected from the seedling, flowering, and mature stages of tomato, cucumber, and soybean plants. 35 microbial community samples were assessed using Illumina sequencing of the photosynthetic reaction center subunit M (pufM) gene. The results revealed significant alpha diversity and community structure differences among the three crops at the different growth stages. Proteobacteria was the dominant bacterial phylum, and Methylobacterium, Roseateles, and Thiorhodococcus were the dominant genera at all growth stages. PCoA revealed clear differences in the structure of the microbial populations isolated from leaf samples collected from different crops at different growth stages. In addition, a dissimilarity test revealed significant differences in the photosynthetic bacterial community among crops and growth stages (P<0.05). The photosynthetic bacterial communities changed during crop growth. OTUs assigned to Methylobacterium were present in varying abundances among different sample types, which we speculated was related to the function of different Methylobacterium species in promoting plant growth development and enhancing plant photosynthetic efficiency. In conclusion, the dynamics observed in this study provide new research ideas for the detailed assessments of the relationship between photosynthetic bacteria and different growth stages of plants.
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14

Jiang, Ze-Yu, i Carl E. Bauer. "Component of the Rhodospirillum centenum Photosensory Apparatus with Structural and Functional Similarity to Methyl-Accepting Chemotaxis Protein Chemoreceptors". Journal of Bacteriology 183, nr 1 (1.01.2001): 171–77. http://dx.doi.org/10.1128/jb.183.1.171-177.2001.

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ABSTRACT Photosynthetic bacteria respond to alterations in light conditions by migrating to locations that allows optimal use of light as an energy source. Studies have indicated that photosynthesis-driven electron transport functions as an attractant signal for motility among purple photosynthetic bacteria. However, it is unclear just how the motility-based signal transduction system monitors electron flow through photosynthesis-driven electron transport. Recently, we have demonstrated that the purple photosynthetic bacteriumRhodospirillum centenum is capable of rapidly moving swarm cell colonies toward infrared light as well as away from visible light. Light-driven colony motility of R. centenum has allowed us to perform genetic dissection of the signaling pathway that affects photosynthesis-driven motility. In this study, we have undertaken sequence and mutational analyses of one of the components of a signal transduction pathway, Ptr, which appears responsible for transmitting a signal from the photosynthesis-driven electron transport chain to the chemotaxis signal transduction cascade. Mutational analysis demonstrates that cells disrupted for ptr are defective in altering motility in response to light, as well as defective in light-dependent release of methanol. We present a model which proposes that Ptr senses the redox state of a component in the photosynthetic cyclic electron transport chain and that Ptr is responsible for transmitting a signal to the chemotaxis machinery to induce a photosynthesis-dependent motility response.
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Cogdell, Richard J., Tina D. Howard, Robert Bittl, Erberhard Schlodder, Irene Geisenheimer i Wolfgang Lubitz. "How carotenoids protect bacterial photosynthesis". Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, nr 1402 (29.10.2000): 1345–49. http://dx.doi.org/10.1098/rstb.2000.0696.

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The essential function of carotenoids in photosynthesis is to act as photoprotective agents, preventing chlorophylls and bacteriochlorophylls from sensitizing harmful photodestructive reactions in the presence of oxygen. Based upon recent structural studies on reaction centres and antenna complexes from purple photosynthetic bacteria, the detailed organization of the carotenoids is described. Then with specific reference to bacterial antenna complexes the details of the photoprotective role, triplet–triplet energy transfer, are presented.
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Chen, Xi, Dengyu Wang, Yanqun Wang, Pengfei Sun, Shuanghui Ma i Tiantian Chen. "Algicidal Effects of a High-Efficiency Algicidal Bacterium Shewanella Y1 on the Toxic Bloom-Causing Dinoflagellate Alexandrium pacificum". Marine Drugs 20, nr 4 (30.03.2022): 239. http://dx.doi.org/10.3390/md20040239.

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Alexandriumpacificum is a typical toxic bloom-forming dinoflagellate, causing serious damage to aquatic ecosystems and human health. Many bacteria have been isolated, having algicidal effects on harmful algal species, while few algicidal bacteria have been found to be able to lyse A. pacificum. Herein, an algicidal bacterium, Shewanella Y1, with algicidal activity to the toxic dinoflagellate A. pacificum, was isolated from Jiaozhou Bay, China, and the physiological responses to oxidative stress in A. pacificum were further investigated to elucidate the mechanism involved in Shewanella Y1. Y1 exhibited a significant algicidal effect (86.64 ± 5.04% at 24 h) and algicidal activity in an indirect manner. The significant declines of the maximal photosynthetic efficiency (Fv/Fm), initial slope of the light limited region (alpha), and maximum relative photosynthetic electron transfer rate (rETRmax) indicated that the Y1 filtrate inhibited photosynthetic activities of A. pacificum. Impaired photosynthesis induced the overproduction of reactive oxygen species (ROS) and caused strong oxidative damage in A. pacificum, ultimately inducing cell death. These findings provide a better understanding of the biological basis of complex algicidal bacterium-harmful algae interactions, providing a potential source of bacterial agent to control harmful algal blooms.
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17

Klug, Gabriele. "Regulation of expression of photosynthesis genes in anoxygenic photosynthetic bacteria". Archives of Microbiology 159, nr 5 (maj 1993): 397–404. http://dx.doi.org/10.1007/bf00288584.

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Sleep, Norman H., i Dennis K. Bird. "Evolutionary ecology during the rise of dioxygen in the Earth's atmosphere". Philosophical Transactions of the Royal Society B: Biological Sciences 363, nr 1504 (9.05.2008): 2651–64. http://dx.doi.org/10.1098/rstb.2008.0018.

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Pre-photosynthetic niches were meagre with a productivity of much less than 10 −4 of modern photosynthesis. Serpentinization, arc volcanism and ridge-axis volcanism reliably provided H 2 . Methanogens and acetogens reacted CO 2 with H 2 to obtain energy and make organic matter. These skills pre-adapted a bacterium for anoxygenic photosynthesis, probably starting with H 2 in lieu of an oxygen ‘acceptor’. Use of ferrous iron and sulphide followed as abundant oxygen acceptors, allowing productivity to approach modern levels. The ‘photobacterium’ proliferated rooting much of the bacterial tree. Land photosynthetic microbes faced a dearth of oxygen acceptors and nutrients. A consortium of photosynthetic and soil bacteria aided weathering and access to ferrous iron. Biologically enhanced weathering led to the formation of shales and, ultimately, to granitic rocks. Already oxidized iron-poor sedimentary rocks and low-iron granites provided scant oxygen acceptors, as did freshwater in their drainages. Cyanobacteria evolved dioxygen production that relieved them of these vicissitudes. They did not immediately dominate the planet. Eventually, anoxygenic and oxygenic photosynthesis oxidized much of the Earth's crust and supplied sulphate to the ocean. Anoxygenic photosynthesis remained important until there was enough O 2 in downwelling seawater to quantitatively oxidize massive sulphides at mid-ocean ridge axes.
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Venkateswaran, K., A. Shimada, A. Maruyama, T. Higashihara, H. Sakou i T. Maruyama. "Microbial characteristics of Palau Jellyfish Lake". Canadian Journal of Microbiology 39, nr 5 (1.05.1993): 506–12. http://dx.doi.org/10.1139/m93-072.

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Microbiological examinations of total bacterial population, culturable aerobic heterotrophs, photosynthetic bacteria, and particulate DNA were carried out in Palau Jellyfish Lake. A 2 m thick bacterial plate layer at 13–15 m depth consisting of various components of microbes was observed in Jellyfish Lake. Photosynthetic bacteria, as seen by flow cytometry, were concentrated at 14–15 m depths with a maximal count of 2.2 × 105 cells∙mL−1 and microscopic analysis confirmed that these purple bacteria were Chromatium sp. Peaks in total bacterial counts (8.3 × 106 cells∙mL−1; 13 m), in the Synechococcus spp. population (2.4 × 106 cells∙mL−1; 13 m), in culturable heterotrophs (105 colony-forming units∙mL−1; 15 m), and in particulate DNA (17.8 μg∙L−1; 10 m) were observed either at the bacterial plate layer that was rich in nutrients or just above this layer in the oxic zone. Bacteriochlorophyll and chlorophyll a exhibited peaks at the photosynthetic bacterial plate (14–15 m). A high concentration of particulate organic carbon was also observed at 15 m. The particulate DNA showed a high degree of correlation with the total bacterial cell number. A low ratio of particulate DNA to particulate organic carbon (0.005) in the water column was found at 15 m and suggested that the particulate materials produced by photosynthetic bacteria would have influenced the concentration of particulate organic carbon. Culturable heterotrophs, clustered into nine different groups, were dominated by species of the genera Vibrio, Aeromonas, and Halomonas.Key words: Jellyfish Lake, microbiological characteristics, Chromatium, particulate DNA, heterotrophs.
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20

Kim, Joong Kyun, Bum-Kyu Lee, Sang-Hee Kim i Jung-Hye Moon. "Characterization of denitrifying photosynthetic bacteria isolated from photosynthetic sludge". Aquacultural Engineering 19, nr 3 (luty 1999): 179–93. http://dx.doi.org/10.1016/s0144-8609(98)00050-8.

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21

Norris, James R., i Marlanne Schiffer. "Photosynthetic reaction centers in bacteria". Chemical & Engineering News 68, nr 31 (30.07.1990): 22—ff. http://dx.doi.org/10.1145/127275.127276.

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Scolnik, P. A., i B. L. Marrs. "Genetic Research with Photosynthetic Bacteria". Annual Review of Microbiology 41, nr 1 (październik 1987): 703–26. http://dx.doi.org/10.1146/annurev.mi.41.100187.003415.

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23

Kushkevych, I. V., i S. O. Hnatush. "The anoxygenic photosynthetic purple bacteria". Studia Biologica 4, nr 3 (2010): 137–54. http://dx.doi.org/10.30970/sbi.0403.116.

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24

Bartley, G. E., i P. A. Scolnik. "Carotenoid Biosynthesis in Photosynthetic Bacteria". Journal of Biological Chemistry 264, nr 22 (sierpień 1989): 13109–13. http://dx.doi.org/10.1016/s0021-9258(18)51602-1.

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NORRIS, JAMES R., i MARIANNE SCHIFFER. "Photosynthetic Reaction Centers in bacteria". Chemical & Engineering News 68, nr 31 (30.07.1990): 22–37. http://dx.doi.org/10.1021/cen-v068n031.p022.

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Sipka, G., M. Kis, J. L. Smart i P. Maroti. "Fluorescence induction of photosynthetic bacteria". Photosynthetica 56, nr 1 (1.03.2018): 125–31. http://dx.doi.org/10.1007/s11099-017-0756-6.

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Millner, PA. "Reaction centres of photosynthetic bacteria". Biochemical Education 19, nr 4 (październik 1991): 221. http://dx.doi.org/10.1016/0307-4412(91)90114-n.

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De la Rosa, M. A. "Reaction Centers of Photosynthetic Bacteria." Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 321, nr 2 (październik 1991): 373–74. http://dx.doi.org/10.1016/0022-0728(91)85620-5.

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De la Rosa, M. A. "Reaction Centers of Photosynthetic Bacteria." Bioelectrochemistry and Bioenergetics 26, nr 2 (październik 1991): 373–74. http://dx.doi.org/10.1016/0302-4598(91)80048-8.

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SAEKI, KAZUHIKO. "Various ferredoxin of photosynthetic bacteria." Kagaku To Seibutsu 31, nr 11 (1993): 750–54. http://dx.doi.org/10.1271/kagakutoseibutsu1962.31.750.

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31

Loach, P. A. "Supramolecular complexes in photosynthetic bacteria". Proceedings of the National Academy of Sciences 97, nr 10 (9.05.2000): 5016–18. http://dx.doi.org/10.1073/pnas.97.10.5016.

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32

Armitage, Judith P. "Tactic responses in photosynthetic bacteria". Canadian Journal of Microbiology 34, nr 4 (1.04.1988): 475–81. http://dx.doi.org/10.1139/m88-081.

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Giraud, Eric, i André Verméglio. "Bacteriophytochromes in anoxygenic photosynthetic bacteria". Photosynthesis Research 97, nr 2 (9.07.2008): 141–53. http://dx.doi.org/10.1007/s11120-008-9323-0.

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Giraud, Eric, i André Verméglio. "Bacteriophytochromes in anoxygenic photosynthetic bacteria". Photosynthesis Research 97, nr 3 (wrzesień 2008): 263. http://dx.doi.org/10.1007/s11120-008-9362-6.

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35

Knaff, David B. "Reaction centers of photosynthetic bacteria". Trends in Biochemical Sciences 13, nr 5 (maj 1988): 157–58. http://dx.doi.org/10.1016/0968-0004(88)90136-3.

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Batubara, U. M., R. D. Sibagariang, S. S. Siregar, T. Maelina, T. Y. Ginting, MR Pratama i M. R. Jaboro. "Determination of Anoxygenic Photosynthetic Bacteria from Water and Sediment in Dumai Coastal Water, Indonesia". IOP Conference Series: Earth and Environmental Science 1118, nr 1 (1.12.2022): 012027. http://dx.doi.org/10.1088/1755-1315/1118/1/012027.

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Abstract Dumai is one of the coastal waters of Indonesia that has the potential for the biodiversity of microorganisms including anoxygenic photosynthetic bacteria (APB). Anoxygenic photosynthetic bacteria are bacteria that carry out decomposition activities even though oxygen levels in water and sediment are very little or even absent. This study aims to determine anoxygenic photosynthetic bacteria from aquatic and sedimentary ecosystems in the coastal waters of Dumai, Indonesia. This research was conducted by an experimental method using modified mineral media. The APB was isolated from six different places in sequence, namely Dumai sea station, river prayer room, harbor, shrimp pond area, fish auction place, and, Purnama tour. All bacteria obtained were then characterized by their morphological and physiological characteristics. The isolation results showed that 15 different bacterial isolates were obtained after being determined based on Bergey’s Manual of Determinative Bacteriology. All isolates contained different pigments such as carotenoids, xanthophylls, and, chlorophylls. Thus, further utilization of APB bacteria can be carried out in various microbiological applications such as bioremediation, aquaculture, biofuel, food, and medicines.
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Lucas, Jose Antonio, Ana Garcia-Villaraco, Maria Belen Montero-Palmero, Blanca Montalban, Beatriz Ramos Solano i Francisco Javier Gutierrez-Mañero. "Physiological and Genetic Modifications Induced by Plant-Growth-Promoting Rhizobacteria (PGPR) in Tomato Plants under Moderate Water Stress". Biology 12, nr 7 (23.06.2023): 901. http://dx.doi.org/10.3390/biology12070901.

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Physiological, metabolic, and genetic changes produced by two plant growth promoting rhizobacteria (PGPR) Pseudomonas sp. (internal code of the laboratory: N 5.12 and N 21.24) inoculated in tomato plants subjected to moderate water stress (10% polyethylene glycol-6000; PEG) were studied. Photosynthesis efficiency, photosynthetic pigments, compatible osmolytes, reactive oxygen species (ROS) scavenging enzymes activities, oxidative stress level and expression of genes related to abscisic acid synthesis (ABA; 9-cis-epoxycarotenoid dioxygenase NCDE1 gene), proline synthesis (Pyrroline-5-carboxylate synthase P5CS gene), and plasma membrane ATPase (PM ATPase gene) were measured. Photosynthetic efficiency was compromised by PEG, but bacterial-inoculated plants reversed the effects: while N5.12 increased carbon fixation (37.5%) maintaining transpiration, N21.24 increased both (14.2% and 31%), negatively affecting stomatal closure, despite the enhanced expression of NCDE1 and plasma membrane ATPase genes, evidencing the activation of different adaptive mechanisms. Among all parameters evaluated, photosynthetic pigments and antioxidant enzymes guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) responded differently to both strains. N 5.12 increased photosynthetic pigments (70% chlorophyll a, 69% chlorophyll b, and 65% carotenoids), proline (33%), glycine betaine (4.3%), and phenolic compounds (21.5%) to a greater extent, thereby decreasing oxidative stress (12.5% in Malondialdehyde, MDA). Both bacteria have highly beneficial effects on tomato plants subjected to moderate water stress, improving their physiological state. The use of these bacteria in agricultural production systems could reduce the amount of water for agricultural irrigation without having a negative impact on food production.
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Shi, Yang, Yueyong Xin, Chao Wang, Robert E. Blankenship, Fei Sun i Xiaoling Xu. "Cryo-EM structures of the air-oxidized and dithionite-reduced photosynthetic alternative complex III from Roseiflexus castenholzii". Science Advances 6, nr 31 (lipiec 2020): eaba2739. http://dx.doi.org/10.1126/sciadv.aba2739.

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Alternative complex III (ACIII) is a multisubunit quinol:electron acceptor oxidoreductase that couples quinol oxidation with transmembrane proton translocation in both the respiratory and photosynthetic electron transport chains of bacteria. The coupling mechanism, however, is poorly understood. Here, we report the cryo-EM structures of air-oxidized and dithionite-reduced ACIII from the photosynthetic bacterium Roseiflexus castenholzii at 3.3- and 3.5-Å resolution, respectively. We identified a menaquinol binding pocket and an electron transfer wire comprising six hemes and four iron-sulfur clusters that is capable of transferring electrons to periplasmic acceptors. We detected a proton translocation passage in which three strictly conserved, mid-passage residues are likely essential for coupling the redox-driven proton translocation across the membrane. These results allow us to propose a previously unrecognized coupling mechanism that links the respiratory and photosynthetic functions of ACIII. This study provides a structural basis for further investigation of the energy transformation mechanisms in bacterial photosynthesis and respiration.
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Oettmeier, Walter, Silvana Preuße i Michael Haefs. "Thiazolylidene-Ketonitriles are Efficient Inhibitors of Electron Transport in Reaction Centers from Photosynthetic Bacteria". Zeitschrift für Naturforschung C 46, nr 11-12 (1.12.1991): 1059–62. http://dx.doi.org/10.1515/znc-1991-11-1221.

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Thiazolylidene-ketonitriles are efficient inhibitors of photosynthetic electron flow in reaction centers from either Rhodobacter sphaeroides or Rhodobacter capsulatus. Some compounds of this class exhibit a higher inhibitory potency in the bacterial system as compared to photosystem II. Up to now, photosystem II inhibitors were generally less active in photosynthetic bacteria. An azido-thiazolylidene-ketonitrile upon illumination almost exclusively tags the L-subunit in the bacterial reaction center.
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Shimizu, Takayuki, Jiangchuan Shen, Mingxu Fang, Yixiang Zhang, Koichi Hori, Jonathan C. Trinidad, Carl E. Bauer, David P. Giedroc i Shinji Masuda. "Sulfide-responsive transcriptional repressor SqrR functions as a master regulator of sulfide-dependent photosynthesis". Proceedings of the National Academy of Sciences 114, nr 9 (14.02.2017): 2355–60. http://dx.doi.org/10.1073/pnas.1614133114.

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Sulfide was used as an electron donor early in the evolution of photosynthesis, with many extant photosynthetic bacteria still capable of using sulfur compounds such as hydrogen sulfide (H2S) as a photosynthetic electron donor. Although enzymes involved in H2S oxidation have been characterized, mechanisms of regulation of sulfide-dependent photosynthesis have not been elucidated. In this study, we have identified a sulfide-responsive transcriptional repressor, SqrR, that functions as a master regulator of sulfide-dependent gene expression in the purple photosynthetic bacterium Rhodobacter capsulatus. SqrR has three cysteine residues, two of which, C41 and C107, are conserved in SqrR homologs from other bacteria. Analysis with liquid chromatography coupled with an electrospray-interface tandem-mass spectrometer reveals that SqrR forms an intramolecular tetrasulfide bond between C41 and C107 when incubated with the sulfur donor glutathione persulfide. SqrR is oxidized in sulfide-stressed cells, and tetrasulfide–cross-linked SqrR binds more weakly to a target promoter relative to unmodified SqrR. C41S and C107S R. capsulatus SqrRs lack the ability to respond to sulfide, and constitutively repress target gene expression in cells. These results establish that SqrR is a sensor of H2S-derived reactive sulfur species that maintain sulfide homeostasis in this photosynthetic bacterium and reveal the mechanism of sulfide-dependent transcriptional derepression of genes involved in sulfide metabolism.
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Mullineaux, Conrad W., i Lu-Ning Liu. "Membrane Dynamics in Phototrophic Bacteria". Annual Review of Microbiology 74, nr 1 (8.09.2020): 633–54. http://dx.doi.org/10.1146/annurev-micro-020518-120134.

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Photosynthetic membranes are typically densely packed with proteins, and this is crucial for their function in efficient trapping of light energy. Despite being crowded with protein, the membranes are fluid systems in which proteins and smaller molecules can diffuse. Fluidity is also crucial for photosynthetic function, as it is essential for biogenesis, electron transport, and protein redistribution for functional regulation. All photosynthetic membranes seem to maintain a delicate balance between crowding, order, and fluidity. How does this work in phototrophic bacteria? In this review, we focus on two types of intensively studied bacterial photosynthetic membranes: the chromatophore membranes of purple bacteria and the thylakoid membranes of cyanobacteria. Both systems are distinct from the plasma membrane, and both have a distinctive protein composition that reflects their specialized roles. Chromatophores are formed from plasma membrane invaginations, while thylakoid membranes appear to be an independent intracellular membrane system. We discuss the techniques that can be applied to study the organization and dynamics of these membrane systems, including electron microscopy techniques, atomic force microscopy, and many variants of fluorescence microscopy. We go on to discuss the insights that havebeen acquired from these techniques, and the role of membrane dynamics in the physiology of photosynthetic membranes. Membrane dynamics on multiple timescales are crucial for membrane function, from electron transport on timescales of microseconds to milliseconds to regulation and biogenesis on timescales of minutes to hours. We emphasize the open questions that remain in the field.
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42

Hemschemeier, A., i T. Happe. "The exceptional photofermentative hydrogen metabolism of the green alga Chlamydomonas reinhardtii". Biochemical Society Transactions 33, nr 1 (1.02.2005): 39–41. http://dx.doi.org/10.1042/bst0330039.

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The photosynthetic green alga Chlamydomonas reinhardtii is capable of performing a complex fermentative metabolism which is related to the mixed acid fermentation of bacteria such as Escherichia coli. The fermentative pattern includes the products formate, ethanol, acetate, glycerol, lactate, carbon dioxide and molecular hydrogen (H2). H2 production is catalysed by an active [Fe]-hydrogenase (HydA) which is coupled with the photosynthetic electron-transport chain. The most important enzyme of the classic fermentation pathway is pyruvate formate-lyase, which is common in bacteria but seldom found in eukaryotes. An interaction between fermentation, photosynthesis and H2 evolution allows the algae to overcome long periods of anaerobiosis. In the absence of sulphur, the cells establish a photofermentative metabolism and accumulate large amounts of H2.
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Beaver, Kevin. "2023 F. M. Becket Fellowship Fellowship – Summary Report: Illuminating Photo-enhanced Bioelectrocatalysis in Purple Bacteria". Electrochemical Society Interface 32, nr 4 (1.12.2023): 41–42. http://dx.doi.org/10.1149/2.f07234if.

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Purple bacteria are a special subclass of photosynthetic bacteria known for their metabolic versatility, resistance to salinity, and bright red-violet pigmentation responsible for photosynthesis. Previous work by the Minteer group has demonstrated purple bacteria to be a viable electrochemical solution for sustainable decontamination of saline wastewater, in addition to biosensing and bio-electrosynthesis applications. Notably, the bacteria’s mechanism of transferring electrons to electrodes is directly related to their photosynthetic electron transfer chain, and current density is significantly enhanced in the presence of light. Often, the light sources used for photo-bioelectrochemistry experimental studies are high-intensity (∼100 mW per cm2) and not wavelength-specific. This leads to uncertainty of the mechanism of photo-enhanced bioelectrocatalysis and may also lead to photo-inhibition at higher light intensities. A novel method was developed to study the effect of isolated light wavelengths on photo-enhanced current.
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Hiraishi, A., Y. Morishima i H. Kitamura. "Use of Isoprenoid Quinone Profiles to Study the Bacterial Community Structure and Population Dynamics in the Photosynthetic Sludge System". Water Science and Technology 23, nr 4-6 (1.02.1991): 937–45. http://dx.doi.org/10.2166/wst.1991.0545.

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Bacterial isoprenoid quinones were used as tools for studying the bacterial community structure and population dynamics in photosynthetic sludge in a full-scale plant and a laboratory batch reactor. Both ubiquinones and menaquinones were detected from all sludge samples, at concentrations of 428 to 886 and 170 to 456 nmol/g (dry weight) of sludge, respectively. Smaller amounts of rhodo-quinones were also found in all sludges. Either ubiquinone-10 (Q-10) or Q-8 was the predominant ubiquinone in the main treatment zones of the plant, while Q-10 predominated in the laboratory sludge. The menaquinone composition of the sludges was more complicated than the ubiquinone profiles recorded. The plant and laboratory sludges contained menaquinone-9 (MK-9) and MK-10, respectively, as the major menaquinone. Bacteriological examination revealed the occurrence of high numbers of the purple nonsulfur bacteria in the photosynthetic sludge reactors. All strains of the phototrophic bacteria isolated from the sludges contained Q-10 as the sole quinone. These results suggest that Q-10 may be used as a biomarker of the phototrophic bacterial population, while other ubiquinones, menaquinones, and rhodoquinones may be useful for monitoring the population dynamics of co-existent chemoheterotrophic bacteria in the photosynthetic sludge process.
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Thi Minh Nguyet, Nguyen, Hoang Phuong Ha, Dong Van Quyen, Nguyen Ngoc Huong Tra i Le Thi Nhi Cong. "Degradation of naphthalene and pyrene by several biofilm-forming photosynthesis purple bacterial strains". Vietnam Journal of Biotechnology 18, nr 3 (28.11.2020): 561–70. http://dx.doi.org/10.15625/1811-4989/18/3/15322.

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Aromatic hydrocarbons such as naphthalene, pyrene are recalcitrant compounds found in oil contaminated areas including petroleum storage tanks, oil exploiting companies. These components are difficult to be degraded/transformed in the lack of oxygen conditions. Among anaerobic and micro-aerobic microorganisms, photosynthetic purple bacteria are the dominant group. Photosynthetic purple bacteria (PPB) are considered as aquatic organisms which are able to grow in anaerobic conditions by photosynthesis but without oxygen. This bacterial group has flexible metabolic types depending on living conditions, then they are widely distributed in nature. There are numerous publications on planktonic PPB which could use naphthalene and pyrene as carbon and energy sources. However, there is no publication on biofilm formed by PPB to degrade their aromatic compounds. In this research, 4 biofilm-forming PPB strains including DQ41, PY2, PY6 and DG12 were screened and estimated their pyrene and napthalene degradation capacity. These organisms demonstrated high biofilm forming ability. As biofilm types, their utilization efficiencies were upper 79% with the initial concentrations of naphthalene and pyrene of 200 and 250 ppm, respectively. These results may contribute to enlarge the number of biofilm-forming microorganisms to degrade/transform aromatic hydrocarbons in polluted area treatment in Vietnam.
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Жильцова, A. A., O. A. Филиппова, E. Д. Краснова, Д. A. Воронов i С. В. Пацаева. "Флуоресценция хлоросомных бактериохлорофиллов в органических растворителях". Оптика и спектроскопия 131, nr 6 (2023): 817. http://dx.doi.org/10.21883/os.2023.06.55916.108-23.

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Chlorosomal bacteriochlorophylls are the main photosynthetic pigments of green sulfur bacteria – anoxygenic phototrophic microorganisms. The spectral properties of chlorophylls of higher plants, algae and cyanobacteria are well studied, however, the spectral-luminescent properties of their related compounds, bacteriochlorophylls, which participate in anoxigenic photosynthesis, are practically not described in the scientific literature. The polarity of the solvent and the environment have a significant effect on the emission spectra (bacterio)chlorophylls, which is expressed in the spectral shift of the absorption and fluorescence maxima, as well as changes in the fluorescence intensity. The spectral characteristics of bacteriochlorophylls d and e were obtained in organic solvents such as acetone, methanol, ethanol and isopropanol, as well as in acetone-ethanol (7:2) and acetone-methanol (7:2) mixtures. These solvents are most often used for the extraction of bacteriochlorophylls from bacterial cells, so the work will be useful for the development of methods for the quantitative determination of chlorosomal bacteriochlorophylls in bacterial cells or in samples of natural water.
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Wang, Li Qiu, Xin Xin Deng i Liang Tian. "A Novel Photosynthetic Bacteria Solar Cell". Advanced Materials Research 773 (wrzesień 2013): 97–100. http://dx.doi.org/10.4028/www.scientific.net/amr.773.97.

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In this paper, a novel photosynthetic bacteria solar cell with Rhodopseudomonas as the electricity generation bacteria was designed and prepared, and photo current changing with the time of the cell was investigated by testing current-time（i-t） curve under alternating light and dark. The results showed that the maximum photo current of the cell could be 13 μA. The influence of glucose, sucrose, chitosan, anthraquinone and hydroquinone on the photo current was investigated. The results indicated that glucose and chitosan made the photo current of solar cell increased about 21 μA and 27 μA, respectively; but sucrose, anthraquinone or hydroquinone had not such effect. It illustrated that photo electrons could be emitted by Rhodopseudomonas and were transmitted to the anode of the cell in the presence of electronic media under light, and the photo current could be improved further by the adding of some additives.
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Grattieri, Matteo, Jennifer Gubitosa, Vito Rizzi, Gabriella Buscemi, Paolo Stufano, Angela Agostiano, Massimo Trotta, Pinalysa Cosma i Gianluca M. Farinola. "Intact Photosynthetic Bacteria-Based Electrochemical Biosensors". ECS Meeting Abstracts MA2022-01, nr 43 (7.07.2022): 1860. http://dx.doi.org/10.1149/ma2022-01431860mtgabs.

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Utilizing photosynthetic entities in electrochemical systems enables converting solar energy into electrical energy, obtaining bio-hybrid photo-electrochemical systems. Such systems have been recently proposed for micro power generation, bioelectrosynthesis, and biosensing for in-situ water quality monitoring.[1] However, due to the photosynthetic apparatus in bacteria (i.e., purple bacteria and cyanobacteria) being physically separated from the electrode surface by the presence of various membrane layers, artificial approaches to divert the photoexcited electrons are required. As a result, research efforts have been focused on developing bio-compatible approaches to facilitate the transfer of photoexcited electrons from these bacteria to the electrodes (and vice versa).[2] Herein, a sustainable biophotoanode based on intact purple bacteria is utilized for the monitoring of phenol-class contaminants that affects photocurrent generation. Specifically, we focused on nitro-phenols and other phenols that might be released in water when food/agricultural wastes are disposed into the environment. All the investigated compounds are known to be toxic, affecting both humans and animals’ health. Furthermore, to follow the green chemistry and bio-circular economy principles, approaches for the possible removal/recovery of these phenols and their degradation products were also investigated, with their possible re-use as active compounds in biomedical applications.[3] Challenges and future research directions for the application of these systems in the field will be discussed. References: [1] M. Grattieri, Purple bacteria photo-bioelectrochemistry: enthralling challenges and opportunities, Photochem. Photobiol. Sci., 19 (2020) 424-435. [2] M. Grattieri, K. Beaver, E.M. Gaffney, F. Dong, S.D. Minteer, Advancing the fundamental understanding and practical applications of photo-bioelectrocatalysis, Chem. Commun., 56 (2020) 8553-8568. [3] J. Gubitosa, V. Rizzi, A. Lopedota, P. Fini, A. Laurenzana, G. Fibbi, F. Fanelli, A. Petrella, Laquintana, N. Denora, R. Comparelli, P. Cosma, One pot environmental friendly synthesis of Gold Nanoparticles using Punica Granatum Juice: a novel antioxidant agent for future dermatological and cosmetic applications, J. Colloid Interface Sci. 521 (2018) 50–61.
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Zhao, Wei, Chun Hua He i Gaung Ming Zhang. "Culture Medium Optimization for Photosynthetic Bacteria". Advanced Materials Research 113-116 (czerwiec 2010): 1443–46. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1443.

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Photosynthetic bacteria (PSB) have various applications but the culture cost is very expensive. To find an efficient and economic culture medium the effects of yeast extract, C/N ratio, and trace elements on the growth of PSB were studied. The results showed that the optimal condition for PSB growth was: yeast extract of 100mg/l, C/N of 12:1, and trace elements (in mol/L): Mn2 + (0.009), Fe3+ (0.0025), Co2+ (0.0024), Cu2 + (0.0024), and Zn2 + (0.0033). Trace element lack could affect the growth of PSB. The order was Mn2 +> Fe3 +> Co2+> Cu2 +> Zn2 +. The improved medium was named HCH, and the optimum medium components were (in g/l) DL-malic acid: (4), MgSO4: (0.12), (NH4)2 SO4: (1), CaCl2: (0.075), KH2PO4: (0.5), K2HPO4: (0.3), Na2EDTA: (0.02), yeast extract : (0.1), trace elements 1ml (in mol/l ): Fe3+: (0.0025), Mn2+: (0.009), Zn2+: (0.0033), Co2+: (0.0024), pH:6.8. Comparing with the traditional RCVBN medium, in HCH medium yield of PSB increased 1.2 times and the cost decreased 19.8 times.
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Cogdell, Richard J., Neil W. Isaacs, Tina D. Howard, Karen McLuskey, Niall J. Fraser i Stephen M. Prince. "How Photosynthetic Bacteria Harvest Solar Energy". Journal of Bacteriology 181, nr 13 (1.07.1999): 3869–79. http://dx.doi.org/10.1128/jb.181.13.3869-3879.1999.

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