Bibliografias temáticas / Photosynthetic

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Literatura científica selecionada sobre o tema "Photosynthetic"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 21 de fevereiro de 2023

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Artigos de revistas sobre o assunto "Photosynthetic"

1

Bai, Yuyu, e John F. Kelly. "A Study of Photosynthetic Activities of Eight Asparagus Genotypes under Field Conditions". Journal of the American Society for Horticultural Science 124, n.º 1 (janeiro de 1999): 61–66. http://dx.doi.org/10.21273/jashs.124.1.61.

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Net photosynthesis from whole plants of eight asparagus (Asparagus officinalis L.) genotypes was measured at two locations in an open infrared gas analysis system. Measurements started at about the completion of full fern growth, which occurred at the end of July and lasted through the season until fern senescence in late September. Net photosynthesis of the eight genotypes ranged from 15.67 to 27.79 μmol·m-2·s-1. Significant differences (P < 0.1) in net photosynthesis were found among the eight genotypes. Both yield and specific leaf mass (SLM) were correlated significantly with net photosynthesis. We suggest that specific leaf mass can be used as a criterion for selecting genotype of high photosynthetic ability. Daily photosynthetic rate patterns were studied and appear to be related to daily changes of stomatal conductance. Seasonal changes of asparagus' photosynthetic activity were studied. High photosynthetic activity was observed from July through August. Photosynthetic activity decreased greatly in September along with the fern maturation and unfavorable changes in environmental conditions.
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Capó-Bauçà, Sebastià, Marcel Font-Carrascosa, Miquel Ribas-Carbó, Andrej Pavlovič e Jeroni Galmés. "Biochemical and mesophyll diffusional limits to photosynthesis are determined by prey and root nutrient uptake in the carnivorous pitcher plant Nepenthes × ventrata". Annals of Botany 126, n.º 1 (16 de março de 2020): 25–37. http://dx.doi.org/10.1093/aob/mcaa041.

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Abstract Background and Aims Carnivorous plants can enhance photosynthetic efficiency in response to prey nutrient uptake, but the underlying mechanisms of increased photosynthesis are largely unknown. Here we investigated photosynthesis in the pitcher plant Nepenthes × ventrata in response to different prey-derived and root mineral nutrition to reveal photosynthetic constrains. Methods Nutrient-stressed plants were irrigated with full inorganic solution or fed with four different insects: wasps, ants, beetles or flies. Full dissection of photosynthetic traits was achieved by means of gas exchange, chlorophyll fluorescence and immunodetection of photosynthesis-related proteins. Leaf biochemical and anatomical parameters together with mineral composition, nitrogen and carbon isotopic discrimination of leaves and insects were also analysed. Key Results Mesophyll diffusion was the major photosynthetic limitation for nutrient-stressed Nepenthes × ventrata, while biochemistry was the major photosynthetic limitation after nutrient application. The better nutrient status of insect-fed and root-fertilized treatments increased chlorophyll, pigment–protein complexes and Rubisco content. As a result, both photochemical and carboxylation potential were enhanced, increasing carbon assimilation. Different nutrient application affected growth, and root-fertilized treatment led to the investment of more biomass in leaves instead of pitchers. Conclusions The study resolved a 35-year-old hypothesis that carnivorous plants increase photosynthetic assimilation via the investment of prey-derived nitrogen in the photosynthetic apparatus. The equilibrium between biochemical and mesophyll limitations of photosynthesis is strongly affected by the nutrient treatment.
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Zhu, Xin-Guang, Donald R. Ort, Martin A. J. Parry e Susanne von Caemmerer. "A wish list for synthetic biology in photosynthesis research". Journal of Experimental Botany 71, n.º 7 (15 de fevereiro de 2020): 2219–25. http://dx.doi.org/10.1093/jxb/eraa075.

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Abstract This perspective summarizes the presentations and discussions at the ‘ International Symposium on Synthetic Biology in Photosynthesis Research’, which was held in Shanghai in 2018. Leveraging the current advanced understanding of photosynthetic systems, the symposium brain-stormed about the redesign and engineering of photosynthetic systems for translational goals and evaluated available new technologies/tools for synthetic biology as well as technological obstacles and new tools that would be needed to overcome them. Four major research areas for redesigning photosynthesis were identified: (i) mining natural variations of photosynthesis; (ii) coordinating photosynthesis with pathways utilizing photosynthate; (iii) reconstruction of highly efficient photosynthetic systems in non-host species; and (iv) development of new photosynthetic systems that do not exist in nature. To expedite photosynthesis synthetic biology research, an array of new technologies and community resources need to be developed, which include expanded modelling capacities, molecular engineering toolboxes, model species, and phenotyping tools.
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Gautam, Harsha, Zebus Sehar, Md Tabish Rehman, Afzal Hussain, Mohamed F. AlAjmi e Nafees A. Khan. "Nitric Oxide Enhances Photosynthetic Nitrogen and Sulfur-Use Efficiency and Activity of Ascorbate-Glutathione Cycle to Reduce High Temperature Stress-Induced Oxidative Stress in Rice (Oryza sativa L.) Plants". Biomolecules 11, n.º 2 (18 de fevereiro de 2021): 305. http://dx.doi.org/10.3390/biom11020305.

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The effects of nitric oxide (NO) as 100 µM sodium nitroprusside (SNP, NO donor) on photosynthetic-nitrogen use efficiency (NUE), photosynthetic-sulfur use efficiency (SUE), photosynthesis, growth and agronomic traits of rice (Oryza sativa L.) cultivars, Taipie-309 (high photosynthetic-N and SUE) and Rasi (low photosynthetic-N and SUE) were investigated under high temperature stress (40 °C for 6 h). Plants exposed to high temperature stress caused significant reduction in photosynthetic activity, use efficiency of N and S, and increment in H2O2 and thiobarbituric acid reactive substance (TBARS) content. The drastic effects of high temperature stress were more pronounced in cultivar Rasi than Taipie-309. However, foliar spray of SNP decreased the high temperature induced H2O2 and TBARS content and increased accumulation of proline and activity of ascorbate–glutathione cycle that collectively improved tolerance to high temperature stress more effectively in Taipie-309. Exogenously applied SNP alleviated the high temperature induced decrease in photosynthesis through maintaining higher photosynthetic-NUE and photosynthetic-SUE, activity of ribulose 1,5 bisphosphate carboxylase/oxygenase (Rubisco), and synthesis of reduced glutathione (GSH). The use of 2-4-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxy-3-oxide (cPTIO, NO scavenger) substantiated the study that in the absence of NO oxidative stress increased, while NO increased photosynthetic-NUE and photosynthetic-SUE, net photosynthesis and plant dry mass. Taken together, the present investigation reveals that NO increased heat stress tolerance and minimized high temperature stress adversaries more effectively in cultivar Taipie-309 than Rasi by enhancing photosynthetic-NUE and SUE and strengthening the antioxidant defense system.
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Man, Rongzhou, e Victor J. Lieffers. "Seasonal variations of photosynthetic capacities of white spruce (Picea glauca) and jack pine (Pinus banksiana) saplings". Canadian Journal of Botany 75, n.º 10 (1 de outubro de 1997): 1766–71. http://dx.doi.org/10.1139/b97-890.

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Seasonal photosynthetic capacity (maximum rate of net photosynthesis at saturating light) was assessed in 30-year-old open-grown Pinus banksiana Lamb, and 20-year-old open-grown and understory Picea glauca (Moench) Voss in central Alberta. Photosynthesis commenced in early April despite cold soils (0 °C) and night frosts. It fluctuated greatly in the summertime during the periods of summer droughts and stopped abruptly in late October when night air temperature dropped below −10 °C. In comparing seasonal maximums, there was proportionally lower photosynthetic capacity in Pinus banksiana than in Picea glauca in the spring and autumn; however, in the summer, photosynthetic capacity in Pinus banksiana was less variable than in Picea glauca. The fluctuation of photosynthetic capacity in understory Picea glauca saplings was greatly reduced in the summertime compared with open-grown saplings. The data suggest that Picea glauca is able to use the periods of high light in the understory when the aspen is leafless by quickly regaining photosynthetic capacity in the spring and maintaining photosynthesis well into the late autumn. Key words: Picea glauca, Pinus banksiana, photosynthesis, season.
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Nagahatenna, Dilrukshi S. K., Jingwen Tiong, Everard J. Edwards, Peter Langridge e Ryan Whitford. "Altering Tetrapyrrole Biosynthesis by Overexpressing Ferrochelatases (Fc1 and Fc2) Improves Photosynthetic Efficiency in Transgenic Barley". Agronomy 10, n.º 9 (11 de setembro de 2020): 1370. http://dx.doi.org/10.3390/agronomy10091370.

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Ferrochelatase (FC) is the terminal enzyme of heme biosynthesis. In photosynthetic organisms studied so far, there is evidence for two FC isoforms, which are encoded by two genes (FC1 and FC2). Previous studies suggest that these two genes are required for the production of two physiologically distinct heme pools with only FC2-derived heme involved in photosynthesis. We characterised two FCs in barley (Hordeum vulgare L.). The two HvFC isoforms share a common catalytic domain, but HvFC2 additionally contains a C-terminal chlorophyll a/b binding (CAB) domain. Both HvFCs are highly expressed in photosynthetic tissues, with HvFC1 transcripts also being abundant in non-photosynthetic tissues. To determine whether these isoforms differentially affect photosynthesis, transgenic barley ectopically overexpressing HvFC1 and HvFC2 were generated and evaluated for photosynthetic performance. In each case, transgenics exhibited improved photosynthetic rate (Asat), stomatal conductance (gs) and carboxylation efficiency (CE), showing that both FC1 and FC2 play important roles in photosynthesis. Our finding that modified FC expression can improve photosynthesis up to ~13% under controlled growth conditions now requires further research to determine if this can be translated to improved yield performance under field conditions.
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Gealy, David R., Sheila A. Squier e Alex G. Ogg. "Photosynthetic Productivity of Mayweed Chamomile (Anthemis cotula)". Weed Science 39, n.º 1 (março de 1991): 18–26. http://dx.doi.org/10.1017/s0043174500057805.

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Photosynthetic productivity parameters were determined for mayweed chamomile, a troublesome annual weed of the cropping systems in the Pacific Northwest. At a photosynthetic photon flux density of 1800 μE m−2s–1, maximum net photosynthetic rate of greenhouse-grown plants was 35 mg CO2dm−2h–1and maximum transpiration rate was 6.7 μg H2O cm−2s–1. Dark respiration rate was 1.4 mg CO2dm−2h–1and the light compensation point was 17.5 μE m−2s–1. Carbon dioxide compensation point increased from 25 ppm at 15 C to 43 ppm at 30 C. At saturating photosynthetic photon flux densities, optimum leaf temperature for net photosynthesis was about 25 C. Maximum net photosynthesis of leaves of field-grown plants averaged 15.8 mg CO2dm−2h–1. After a 24-h exposure to 0.075 kg ha–1metribuzin, maximum net photosynthesis and transpiration were reduced 85 and 40%, respectively. Soil water deficits reduced maximum net photosynthesis about 50%.
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Yu-He, Ji, Zhou Guang-Sheng, Ma Xue-Yan, Wang Qiu-Ling e Liu Tao. "Variable photosynthetic sensitivity of maize (Zea mays L.) to sunlight and temperature during drought development process". Plant, Soil and Environment 63, No. 11 (20 de novembro de 2017): 505–11. http://dx.doi.org/10.17221/664/2017-pse.

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The complex interaction process of the abiotic factors (sunlight, air temperature and soil water) in regulating maize (Zea mays L.) photosynthesis has not been fully understood. Our field experiment explored the changed sensitivity (or role) of the abiotic factors in regulating maize photosynthesis under a drought development process. The experiment established a scenario with a long-term drought and an instantaneous cloud cover. The results revealed that long-term drought stress causes the sensitivity (or role) of sunlight and temperature exchanged in regulating maize photosynthesis. The maize photosynthesis was more sensitive to instantaneous sunlight rather than temperature in the absence of drought. However, a diminishing photosynthetic sensitivity to sunlight but an increasing photosynthetic sensitivity to temperature was observed with drought development process. The variable photosynthetic sensitivity indicated that the roles of temperature and sunlight in regulating maize photosynthesis were exchanged, so it is expected that higher photosynthetic rate could be achieved by adjusting temperature rather than sunlight after severe drought. Nevertheless, further studies are needed to provide more evidence and mechanism explanations.
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Hu, Xiche, Thorsten Ritz, Ana Damjanović, Felix Autenrieth e Klaus Schulten. "Photosynthetic apparatus of purple bacteria". Quarterly Reviews of Biophysics 35, n.º 1 (fevereiro de 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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Guo, Ying, Tongli Wang, Fang-Fang Fu, Yousry A. El-Kassaby e Guibin Wang. "Metabolome and Transcriptome Analyses Reveal the Regulatory Mechanisms of Photosynthesis in Developing Ginkgo biloba Leaves". International Journal of Molecular Sciences 22, n.º 5 (5 de março de 2021): 2601. http://dx.doi.org/10.3390/ijms22052601.

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Ginkgo (Ginkgo biloba L.) is a deciduous tree species with high timber, medicinal, ecological, ornamental, and scientific values, and is widely cultivated worldwide. However, for such an important tree species, the regulatory mechanisms involved in the photosynthesis of developing leaves remain largely unknown. Here, we observed variations in light response curves (LRCs) and photosynthetic parameters (photosynthetic capacity (Pnmax) and dark respiration rate (Rd)) of leaves across different developmental stages. We found the divergence in the abundance of compounds (such as 3-phospho-d-glyceroyl phosphate, sedoheptulose-1,7-bisphosphate, and malate) involved in photosynthetic carbon metabolism. Additionally, a co-expression network was constructed to reveal 242 correlations between transcription factors (TFs) and photosynthesis-related genes (p < 0.05, |r| > 0.8). We found that the genes involved in the photosynthetic light reaction pathway were regulated by multiple TFs, such as bHLH, WRKY, ARF, IDD, and TFIIIA. Our analysis allowed the identification of candidate genes that most likely regulate photosynthesis, primary carbon metabolism, and plant development and as such, provide a theoretical basis for improving the photosynthetic capacity and yield of ginkgo trees.
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Teses / dissertações sobre o assunto "Photosynthetic"

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Forrest, Mary Elspet. "Studies on the transcription of photosynthesis genes of the photosynthetic bacterium Rhodobacter capsulatus". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28778.

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Rhodobacter capsulatus is a Gram negative bacterium that exhibits a variety of growth modes, including chemoheterotrophic growth and photoheterotrophic growth. Upon a shift of cultures from high to low oxygen concentrations the photosynthetic apparatus is synthesized and incorporated into the inner membrane. The puf operon contains genes that encode structural proteins found in the light-harvesting and reaction center complexes. In a preliminary attempt to pinpoint the location of the puf promoter R. capsulatus RNA polymerase was purified by standard techniques and used in in vitro runoff transcription assays. It was found that the polymerase was capable of specific transcription with linearized pUC13 DNA but no specific transcription could be obtained with K capsulatus DNA. It was concluded that some factor or condition necessary for specific transcription with R capsulatus DNA was absent from these assays. The location of the puf promoter was subsequently found through a series of deletions and oligonucleotide-directed mutations in the 5' region of the puf operon. Fragments that contained these mutations were placed translationally in-frame with the lacZ gene of Escherichia coli in plasmids that could be conjugated into K capsulatus. Assays of beta-galactosidase activities under low and high oxygen conditions resulted in localization of the promoter to a position approximately 540 basepairs upstream of what was previously believed to be the first gene of the operon, the pufB gene. RNA 5' end-mapping experiments showed that the quantity of RNA transcripts obtained were comparable to the lacZ activities. The existence of multiple low abundance RNA 5' ends prompted the theory that the primary transcript has a short half-life, and is rapidly processed to yield a more stable transcript with a 5' end that maps just upstream of the pufB gene. It was found that only the 5' end nearest to the promoter could be capped by guanylyl transferase, and this could only be detected when the putative processing sites were deleted. The DNA sequence between the promoter and the pufB gene contains a new gene of the puf operon, the pufO gene. Deletion of this gene showed that it plays an essential role in the formation of mature light-harvesting and reaction center complexes.
Science, Faculty of
Microbiology and Immunology, Department of
Graduate
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Tan, Swee Ching. "Photosynthetic proteins photovoltaic devices". Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609050.

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Bibby, T. S. "Photosynthetic complexes of cyanobacteria". Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595520.

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Tomeo, Nicholas J. "Genetic Variation in Photosynthesis as a Tool for Finding Principal Routes to Enhancing Photosynthetic Efficiency". Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1492185865465393.

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Channa, Aravinda Wijesinghe W. M. "Photosynthetic antenna-reaction-center mimicry". Diss., Wichita State University, 2012. http://hdl.handle.net/10057/5369.

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The research presented in this dissertation discusses the mimicry of primary events in natural photosynthesis via artificial molecular constructs. Photosynthesis involves two major steps, absorption of light by antenna pigments and transfer of the excitation energy to the reaction center where charge separated entities are formed via photoinduced electron transfer (PET). The synthesized artificial molecular systems are comprisedof porphyrin-fullerene, donor-acceptor entities due to their well studied photophysical properties which are essential to yield long-lived charge-separated states. Covalent and non covalent binding strategies have been employed in the design and synthesis of these novel artificial antenna-reaction centers. The synthesized molecular systems are characterized using standard spectroscopic techniques. Their properties and performances in terms of an artificial photosynthetic model are evaluated by electrochemical, computational, time resolved emission, and transient absorption spectral studies. The systems studied reveal their potential in transferring excitation energy and yielding long-lived charge separated states with fast charge separation and slow charge recombination. The photoelectrochemistry of some of the compounds reveal their ability to convert light into electricity. Some triads show better performance as dyes in dye sensitized solar cells giving around 12% IPCE, incident photon-to-photocurrent conversion efficiency.
Thesis (Ph.D.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Chemistry
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Nandha, Beena. "Regulation of photosynthetic electron transport". Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.502263.

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Investigations in this thesis aimed to understand the mechanisms that regulate the photosynthetic electron transport chain in C3 plants and therefore also the significance of cyclic electron flow (CEF). Physiological analysis of Arabidopsis thaliana photosynthetic pgr5 mutant, which had previously been reported to be a CEF mutant, were undertaken. The reduced state of P700 in the light meant that standard assays for P700 and CEF, using P700 absorbance could not be applied. Design and development of flash spectrophotometric techniques were necessary. This primarily involved P700 oxidation kinetics at 820 nm combined with the electrochromic shift at 520 nm to measure electrical field generation.
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Beanland, Timothy James. "The phylogeny of photosynthetic organisms". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385339.

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Horken, Kempton M. "Isolation of photosynthetic membranes and submembranous particles from the cyanobacterium synechococcus PCC 7942". Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1036184.

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Photosynthetic membranes were prepared from the cyanobacterium Synechococcus PCC 7942 with oxygen evolving specific activity of 250-300 µmoles 02/ mg chl/hr. The membranes retained activity with a half-life of 4-5 days when stored at 0°C, or when quickly frozen in liquid nitrogen, greater than 95% of the activity remained after 2 months. Attempts to purify homogeneous preparations of photosystem II complexes from these membranes by detergent extraction were unsuccessful as indicated by a lack of a significant increase in oxygen evolution specific activity of the detergent extracts. Photosynthetic membrane detergent extracts usually maintained the same oxygen evolution specific activity as the orginal membranes, and a considerable amount of Photosystem I activity (75 µmoles 02 consumed /mg chl/hr in the Mehler reaction) was still present. The donor side of the photosystem II particles in the detergent extract was intact since the artificial electron acceptor, 2,6-dichiorophenolindophenol (DCPIP), was reduced at a rate comparable to the oxygen evolving activity. All oxygen evolving activity of the detergent extracts was lost when ion-exchange chromatography was used to resolve the co-extracted photosystem II and photosystem I complexes.
Department of Biology
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Zilsel, Joanna. "Studies on inter-species expression of photosynthesis genes in Rhodobacter capsulatus". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29902.

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The primary amino acid sequences of the L, M, and H photosynthetic reaction center peptide subunits from a number of purple non-sulfur bacteria, including Rhodopseudomonas viridis, Rhodobacter sphaeroides, and Rhodobacter capsulatus have been previously shown to be highly homologous, and detailed X-ray crystallographic analyses of reaction centers from two species of purple non-sulfur bacteria, Rps. viridis and R. sphaeroides have shown that all recognized structural and functional features are conserved. Experiments were undertaken to determine whether genes encoding reaction center and light harvesting peptide subunits from one species could be functionally expressed in other species. Plasmid-borne copies of R sphaeroides and Rps. viridis pigment binding-peptide genes were independently introduced into a photosynthetically incompetent R. capsulatus mutant host strain, deficient in all known pigment-binding peptide genes. The R. sphaeroides puf operon, which encodes the L and M subunits of the reaction center as well as both peptide subunits of light harvesting complex I, was shown to be capable of complementing the mutant R. capsulatus host. Hybrid reaction centers, comprised of R. sphaeroides-encoded L and M subunits and an R. capsulatus-encoded H subunit, were formed in addition to the R. sphaeroides-encoded LHI complexes. These hybrid cells were capable of photosynthetic growth, but their slower growth rates under low light conditions and their higher fluorescence emission levels relative to cells containing native complexes, indicated an impairment in energy transduction. The Rps. viridis puf operon was found to be incapable of functional expression in the R. capsulatus mutant host. Introduction of a plasmid-borne copy of the Rps. viridis puhA gene, which encodes the H subunit of the reaction center, into host cells already containing the Rps. viridis puf operon, such that all structural peptides of the Rps. viridis reaction center were present, still did not permit stable assembly of Rps. viridis photosynthetic complexes. RNA blot analysis demonstrated that the barrier to functional expression was not at the level of transcription. Differences between Rps. viridis and R. sphaeroides that may account for their differing abilities to complement the R. capsulatus mutant host strain are discussed.
Science, Faculty of
Microbiology and Immunology, Department of
Graduate
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Gallagher, Victoria Nicole. "Photosynthetic hydrogen production by Chlamydomonas reinhardtii". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 72 p, 2007. http://proquest.umi.com/pqdweb?did=1338926921&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Livros sobre o assunto "Photosynthetic"

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E, Blankenship Robert, Madigan Michael T. 1949- e Bauer C. E, eds. Anoxygenic photosynthetic bacteria. Dordrecht: Kluwer Academic Publishers, 1995.

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2

H, Mann Nicholas, e Carr N. G, eds. Photosynthetic prokaryotes. New York: Plenum Press, 1992.

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Singh, Shailendra Kumar, Shanthy Sundaram e Kaushal Kishor. Photosynthetic Microorganisms. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09123-5.

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Mann, Nicholas H., e Noel G. Carr, eds. Photosynthetic Prokaryotes. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4757-1332-9.

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Smith, William K., Thomas C. Vogelmann e Christa Critchley, eds. Photosynthetic Adaptation. New York, NY: Springer New York, 2004. http://dx.doi.org/10.1007/b138844.

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EMBO, Workshop on Green Photosynthetic Bacteria (1987 Nyborg Denmark). Green photosynthetic bacteria. New York: Plenum Press, 1988.

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Olson, J. M., J. G. Ormerod, J. Amesz, E. Stackebrandt e H. G. Trüper, eds. Green Photosynthetic Bacteria. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1021-1.

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Blankenship, Robert E., Michael T. Madigan e Carl E. Bauer, eds. Anoxygenic Photosynthetic Bacteria. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/0-306-47954-0.

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Ruban, Alexander. The Photosynthetic Membrane. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118447628.

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Harashima, Keiji, Tsuneo Shiba e Norio Murata. Aerobic photosynthetic bacteria. Tokyo: Japan Scientific Societies Press, 1989.

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Capítulos de livros sobre o assunto "Photosynthetic"

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Yamori, Wataru. "Strategies for Engineering Photosynthesis for Enhanced Plant Biomass Production". In Rice Improvement, 31–58. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66530-2_2.

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AbstractCrop productivity would have to increase by 60–110% compared with the 2005 level by 2050 to meet both the food and energy demands of the growing population. Although more than 90% of crop biomass is derived from photosynthetic products, photosynthetic improvements have not yet been addressed by breeding. Thus, it has been considered that enhancing photosynthetic capacity is considered a promising approach for increasing crop yield. Now, we need to identify the specific targets that would improve leaf photosynthesis to realize a new Green Revolution. This chapter summarizes the various genetic engineering approaches that can be used to enhance photosynthetic capacity and crop productivity. The targets considered for the possible candidates include Rubisco, Rubisco activase, enzymes of the Calvin–Benson cycle, and CO2 transport, as well as photosynthetic electron transport. Finally, it describes the importance of considering ways to improve photosynthesis not under the stable environmental conditions already examined in many studies with the aim of improving photosynthetic capacity, but under natural conditions in which various environmental factors, and especially irradiation, continually fluctuate.
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Montero, Francisco. "Photosynthetic Pigments". In Encyclopedia of Astrobiology, 1249. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1205.

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Sirevåg, Reidun. "Photosynthetic Bacteria". In Carbon Dioxide as a Source of Carbon, 237–61. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3923-3_13.

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Montero, Francisco. "Photosynthetic Pigments". In Encyclopedia of Astrobiology, 1883–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1205.

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Romberger, John A., Zygmunt Hejnowicz e Jane F. Hill. "Photosynthetic Systems". In Plant Structure: Function and Development, 67–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-01662-6_5.

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Montero, Francisco. "Photosynthetic Pigments". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1205-2.

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Hallenbeck, Patrick C., Carolina Zampol Lazaro e Emrah Sagir. "CHAPTER 1. Photosynthesis and Hydrogen from Photosynthetic Microorganisms". In Comprehensive Series in Photochemical & Photobiological Sciences, 1–30. Cambridge: Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781849737128-00001.

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Geider, Richard J., e Bruce A. Osborne. "Measuring Photosynthetic Pigments". In Algal Photosynthesis, 107–21. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4757-2153-9_5.

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Mathis, P. "Photosynthetic Reaction Centers". In Light as an Energy Source and Information Carrier in Plant Physiology, 75–88. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0409-8_6.

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Vernadsky, Vladimir I. "Photosynthetic Living Matter". In The Biosphere, 72–84. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-1750-3_6.

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Trabalhos de conferências sobre o assunto "Photosynthetic"

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Petaja, Guna, Ilze Karklina e Santa Neimane. "Short-term effects of fertilization on photosynthetic activity in a deciduous tree plantation". In Research for Rural Development 2021 : annual 27th International scientific conference proceedings. Latvia University of Life Sciences and Technologies, 2021. http://dx.doi.org/10.22616/rrd.27.2021.008.

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Fertilization is a method to enhance tree growth and timber production. Ammonium nitrate and wood ash are commonly used fertilizers, which can be applied at the same time to increase levels of both nitrogen and other macro- and micronutrients. We studied how ammonium nitrate and wood ash fertilization affects photosynthetic activity and transpiration at leaf level in a deciduous tree plantation in former agricultural land with mineral soil, located in the central part of Latvia (Keipene parish). Additionally, we performed foliar and soil nutrient analyses. Our results support the notion that nitrogen fertilization may not result in increased photosynthetic activity. It is possible that the photosynthetic activity has increased at canopy scale along with increasing leaf area, not at leaf scale. Wood ash addition seems to have resulted in higher photosynthetic activity for hybrid alder, although it could not be explained with phosphorus availability. Although closely related to photosynthesis, in most cases transpiration was not positively affected by fertilization. Environmental factors, such as humidity, temperature and wind speed may have a greater effect on this process.
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Sundyreva, M. A., A. N. Rebrov, A. E. Mishko e E. O. Lutsky. "The effect of sucrose concentration in the culture medium on the formation of abscisic acid and the activity of the photosynthetic apparatus of grape plants in vitro". In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.240.

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An increase in sucrose in the medium increased the content of pigments, gene expression of the photosynthetic apparatus, growth processes, and H2O2, but decreased the quantum yield of photosynthesis. With a change in the sucrose content in the medium, the expression of ABA1 increased most intensively. 30 g/l of sucrose in the medium inhibited the expression of genes involved in the formation of ABA.
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Samadi, Zahra, Eric Johlin, Christopher DeGroot e Hassan Peerhossaini. "Modelling Optical Properties of Algae Using the Finite-Difference Time Domain Method". In ASME 2021 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fedsm2021-66314.

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Abstract Photosynthetic microorganisms are important to the Earth’s ecosystem, since about half of the atmospheric oxygen is produced by photosynthesis. Microalgae and photosynthetic bacteria are also utilized in a wide range of industries in photobioreactors. In order to have better control over photobioreactors under various operating conditions, it is necessary to accurately characterize the propagation of light in the reactor. Theoretical methods are able to calculate the optical properties of microorganisms through the solution of Maxwell’s equations of electromagnetic wave theory. To solve Maxwell’s equations, various methods can be used including Lorenz-Mie, T-Matrix, Finite-Difference Time-Domain (FDTD), and Volume Integral methods. Most theoretical methods predict the optical properties of microorganisms by Lorenz-Mie theory. Lorenz–Mie theory is applicable for homogeneous and spherical particles, homogeneous concentric spheres, or coated spheres. This work seeks to determine the suitability of the commonly used homogenous-sphere, coated-sphere, and heterogenous-sphere approximation by simulating the optical behavior of photosynthetic microorganism (Chlamydomonas reinhardtii) using FDTD and an accurate geometric model. Here, each of the key cell organelles will be included in the model with the appropriate optical properties specified. These results allow for a more accurate optical model to be developed while studying the effects of different growth regimes.
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Sakshaug, Egil. "Variability in photosynthetic parameters". In High Latitude Optics, editado por Hans-Christian Eilertsen. SPIE, 1993. http://dx.doi.org/10.1117/12.165490.

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Farinola, Gianluca Maria. "Optoelectronics with photosynthetic microorganisms". In Light Actuators for Optical Stimulation of Living Systems. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.liv-act.2022.007.

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"Photosynthetic Rates in Mangroves". In International Conference on Plant, Marine and Environmental Sciences. International Institute of Chemical, Biological & Environmental Engineering, 2015. http://dx.doi.org/10.15242/iicbe.c0115015.

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ПИГАРЕВА, Светлана, Svetlana PIGAREVA, Наталья Зайцева, Natalya Zaitseva, Татьяна ЯГОВЕНКО e Tat'yana YaGOVENKO. "EFFECT OF THE FUNGICIDE AMISTAR EXTRA ON A NUMBER OF BIOCHEMICAL INDICATORS OF YELLOW LUPIN PLANTS". In Multifunctional adaptive feed production. ru: Federal Williams Research Center of Forage Production and Agroecology, 2019. http://dx.doi.org/10.33814/mak-2019-21-69-40-44.

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The positive impact of fungicide Amistar extra on a number of physiological parameters is shown. Assimilation surface describes a level of photosynthetic potential and netto prod-uctivity of photosynthesis which increased in 1.07 and 1.09 times. Fungicide impact on nitrogen accumulation and dry matter in a plant was set. Decreasing of the total amount of plant pods was recorded. The treatment increased protein content in seeds of var. Prestizh. Tendency for increasing of alkaloid level in yellow lupin seeds and green mass was noticed.
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JUCHNEVIČIENĖ, Aistė, e Ilona VAGUSEVIČIENĖ. "THE DYNAMICS OF PHOTOSYNTHETIC PIGMENTS IN WINTER WHEAT LEAVES WHEN USING NITROGEN FERTILISERS". In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.033.

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The paper investigates the effect of nitrogen fertilisers on the amount of photosynthetic pigments in winter wheat leaves. The research was carried out in the period between 2012 and 2013 at the Experimental Station of Aleksandras Stulginskis University in carbonate shallow gleyic leached soil, (Calc(ar)i-Epihypogleyic Luvisol). The object of investigation: winter wheat cultivars ‘Zentos’ and ‘Ada’. Granular superphosphate (P60) and potassium chloride (K60) fertilisers were spread during sowing, while amonium nitrate (N60) was used in tillering time (BBCH 23–25), after the vegetative growth had resumed. Additionally, the plants were treated with foliar fertiliser urea solution: N30, N40 at booting stage (BBCH 34–36) and N15, N30 at milk ripening stage (BBCH 71–74). After the analysis of the data, it was established that additional fertilization with N30 and N40 fertiliser application rates at later stages of plant development stimulated the accumulation of photosynthetic pigments and prolonged the period of active photosynthesis. Irrespective of treatment with nitrogen fertilisers, genetic properties of the cultivar also had influence on the accumulation of the pigments. Wheat cultivar ‘Zentos’ tended to accumulate larger amounts of pigments. The highest amounts of pigments were found at the beginning of milk ripening stage before additional treatment with N15, N30 fertiliser application rates.
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Boxer, Steven G., Jon Stocker, Stefan Franzen e Joshua Salafsky. "Re-engineering photosynthetic reaction centers". In Molecular electronics—Science and Technology. AIP, 1992. http://dx.doi.org/10.1063/1.42655.

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"Genomics of non-photosynthetic plants". In Plant Genetics, Genomics, Bioinformatics, and Biotechnology. Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 2019. http://dx.doi.org/10.18699/plantgen2019-105.

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Relatórios de organizações sobre o assunto "Photosynthetic"

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), julho de 2004. http://dx.doi.org/10.2172/882674.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), janeiro de 2005. http://dx.doi.org/10.2172/882727.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), julho de 2003. http://dx.doi.org/10.2172/882731.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), outubro de 2004. http://dx.doi.org/10.2172/882895.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), janeiro de 2006. http://dx.doi.org/10.2172/888741.

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Dr. David J. Bayless, Dr. Morgan Vis, Dr. Gregory Kremer, Dr. Michael Prudich, Dr. Keith Cooksey e Dr. Jeff Muhs. ENHANCED PRACTICAL PHOTOSYNTHETIC CO2 MITIGATION. Office of Scientific and Technical Information (OSTI), janeiro de 2001. http://dx.doi.org/10.2172/811433.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. ENHANCED PRACTICAL PHOTOSYNTHETIC CO2 MITIGATION. Office of Scientific and Technical Information (OSTI), janeiro de 2004. http://dx.doi.org/10.2172/825587.

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Gregory Kremer, David J. Bayless, Morgan Vis, Michael Prudich, Keith Cooksey e Jeff Muhs. Enhanced Practical Photosynthetic CO2 Mitigation. Office of Scientific and Technical Information (OSTI), outubro de 2003. http://dx.doi.org/10.2172/875678.

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Dr. David J. Bayless, Dr. Morgan Vis, Dr. Gregory Kremer, Dr. Michael Prudich, Dr. Keith Cooksey e Dr. Jeff Muhs. ENHANCED PRACTICAL PHOTOSYNTHETIC CO2 MITIGATION. Office of Scientific and Technical Information (OSTI), abril de 2001. http://dx.doi.org/10.2172/813656.

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Dr. Gregory Kremer, Dr. David J. Bayless, Dr. Morgan Vis, Dr. Michael Prudich, Dr. Keith Cooksey e Dr. Jeff Muhs. ENHANCED PRACTICAL PHOTOSYNTHETIC CO2 MITIGATION. Office of Scientific and Technical Information (OSTI), julho de 2001. http://dx.doi.org/10.2172/813657.

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