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https://www.readbyqxmd.com/read/28528426/building-a-bio-based-industry-in-the-middle-east-through-harnessing-the-potential-of-the-red-sea-biodiversity
#1
REVIEW
Jens Nielsen, John Archer, Magbubah Essack, Vladimir B Bajic, Takashi Gojobori, Ivan Mijakovic
The incentive for developing microbial cell factories for production of fuels and chemicals comes from the ability of microbes to deliver these valuable compounds at a reduced cost and with a smaller environmental impact compared to the analogous chemical synthesis. Another crucial advantage of microbes is their great biological diversity, which offers a much larger "catalog" of molecules than the one obtainable by chemical synthesis. Adaptation to different environments is one of the important drives behind microbial diversity...
May 20, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28527334/photo-protective-mechanisms-in-reed-canary-grass-to-alleviate-photo-inhibition-of-psii-on-the-qinghai-tibet-plateau
#2
Chao Zhang, Da-Wei Zhang, Yan-Ni Sun, Muhammad Arfan, Da-Xu Li, Jia-Jun Yan, Ming-Hong You, Shi-Qie Bai, Hong-Hui Lin
Due to its characteristic of high biomass yield potential, there is considerable interest in cultivating Phalaris arundinacea L. cv. 'chuancaoyin No.3' (reed canary grass) on the Qinghai-Tibet Plateau where there is an abundance of alpine steppe meadow and a potential large market for animal husbandry. In this study, we 1) investigate whether reed canary grass exhibits superior productive capacity to Elymus nutans 'Aba' (E. nutans), ordinary common pasture, during the long warm days of summer at high-altitude; and 2) compare the cold tolerance between reed canary grass and E...
May 4, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28526981/rubisco-mutants-of-chlamydomonas-reinhardtii-display-divergent-photosynthetic-parameters-and-lipid-allocation
#3
M G Esquível, A R Matos, J Marques Silva
Photosynthesis and lipid allocation were investigated in Rubisco small subunit mutants of the microalga Chlamydomonas reinhardtii. Comparative analyses were undertaken with cells grown photoheterotrophically under sulphur-replete or sulphur-depleted conditions. The Y67A Rubisco mutant, which has previously demonstrated a pronounced reduction in Rubisco levels and higher hydrogen production rates than the wild type, also shows the following divergences in photosynthetic phenotype and lipid allocation: (i) low Fv/Fm (maximum photochemical efficiency), (ii) low effective quantum yield of photosystem II (ΦPSII), (iii) low effectiveness at protection against high light intensities, (iv) a higher level of total lipids per pigment and (v) changes in the relative proportions of different fatty acids, with a marked decrease in unsaturated fatty acids (FAs)...
May 19, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28526118/effects-of-elevated-nutrients-and-co2-emission-scenarios-on-three-coral-reef-macroalgae
#4
Dorothea Bender-Champ, Guillermo Diaz-Pulido, Sophie Dove
Coral reef macroalgae are expected to thrive in the future under conditions that are deleterious to the health of reef-building corals. Here we examined how macroalgae would be affected by exposure to future CO2 emission scenarios (pCO2 and temperature), enriched nutrients and combinations of both. The species tested, Laurencia intricata (Rhodophyta), Turbinaria ornata and Chnoospora implexa (both Phaeophyceae), have active carbon-concentrating mechanisms but responded differently to the treatments. L. intricata showed high mortality under nutrient enriched RCP4...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526116/allelopathic-interactions-between-the-macroalga-hizikia-fusiformis-harvey-and-the-harmful-blooms-forming-dinoflagellate-karenia-mikimotoi
#5
Zengling Ma, Mingjiang Wu, Lidong Lin, Ronald W Thring, Hengguo Yu, Xu Zhang, Min Zhao
The effects of algal blooms on seaweeds have been rarely studied, although harmful algal blooms (HABs) are now normally regarded as worldwide incidents. In the present study, the effects of dense Karenia mikimotoi cells on the growth and photosynthesis of Hizikia fusiformis, a common and commercially cultivated macroalga in coastal waters of the East China Sea (ECS), were studied to understand the possible consequences when the mariculture encountered a dense harmful algal bloom. Furthermore, the counteraction of the latter on the growth and photosynthetic activities of K...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526061/photosynthesis-at-the-far-red-region-of-the-spectrum-in-acaryochloris-marina
#6
REVIEW
Syed Lal Badshah, Yahia Mabkhot, Salim S Al-Showiman
Acaryochloris marina is an oxygenic cyanobacterium that utilizes far-red light for photosynthesis. It has an expanded genome, which helps in its adaptability to the environment, where it can survive on low energy photons. Its major light absorbing pigment is chlorophyll d and it has α-carotene as a major carotenoid. Light harvesting antenna includes the external phycobilin binding proteins, which are hexameric rods made of phycocyanin and allophycocyanins, while the small integral membrane bound chlorophyll binding proteins are also present...
May 19, 2017: Biological Research
https://www.readbyqxmd.com/read/28525816/evaluation-of-the-toxicity-of-herbicide-topramezone-to-chlorella-vulgaris-oxidative-stress-cell-morphology-and-photosynthetic-activity
#7
Fangfang Zhao, Qingqing Xiang, Ying Zhou, Xiao Xu, Xinyi Qiu, Yi Yu, Farooq Ahmad
Topramezone is a new, highly selective herbicide of pyrazole structure for the post-emergence control of broadleaf and grass weeds in corn. In this study, the effects of topramezone on C. vulgaris, especially in relation to the cell growth, oxidative stress, cell morphology and photosynthetic activity were assessed. Results showed that topramezone treatment was detrimental to C. vulgaris growth during the 24-96h of exposure. The changes in cells pigments content and relative transcript of photosynthesis-related genes, which implies that topramezone disrupted the photosynthetic system...
May 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28524183/artificial-photosynthesis-closing-remarks
#8
Leif Hammarström
This paper derives from my closing remarks lecture at the 198(th) Faraday Discussion meeting on Artificial Photosynthesis, Kyoto, Japan, February 28-March 2. The meeting had sessions on biological approaches and fundamental processes, molecular catalysts, inorganic assembly catalysts, and integration of systems for demonstrating realistic devices. The field has had much progress since the previous Faraday Discussion on Artificial Photosynthesis in Edinburgh, UK, in 2011. This paper is a personal account of recent discussions and developments in the field, as reflected in and discussed during the meeting...
May 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28523606/frederick-yi-tung-cho-1939-2011-his-phd-days-in-biophysics-the-photosynthesis-lab-and-his-patents-in-engineering-physics
#9
Govindjee, John C Munday, George C Papageorgiou
We present here a Tribute to Frederick Yi-Tung Cho (1939-2011), an innovative and ingenious biophysicist and an entrepreneur. He was one of the 4 earliest PhD students [see: Cederstrand (1965)-Carl Nelson Cederstrand; coadvisor: Eugene Rabinowitch; Papageorgiou (1968)-George C. Papageorgiou (coauthor of this paper); and Munday (1968)-John C. Munday Jr. (also a coauthor of this paper)] of one of us (Govindjee) in Biophysics at the University of Illinois at Urbana-Champaign (UIUC) during the late 1960s (1963-1968)...
May 18, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28523012/growth-and-accumulation-of-secondary-metabolites-in-perilla-as-affected-by-photosynthetic-photon-flux-density-and-electrical-conductivity-of-the-nutrient-solution
#10
Na Lu, Emmanuel L Bernardo, Chayanit Tippayadarapanich, Michiko Takagaki, Natsuko Kagawa, Wataru Yamori
The global demand for medicinal plants is increasing. The quality of plants grown outdoors, however, is difficult to control. Myriad environmental factors influence plant growth and directly impact biosynthetic pathways, thus affecting the secondary metabolism of bioactive compounds. Plant factories use artificial lighting to increase the quality of medicinal plants and stabilize production. Photosynthetic photon flux density (PPFD) and electrical conductivity (EC) of nutrient solutions are two important factors that substantially influence perilla (Perilla frutescens, Labiatae) plant growth and quality...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28522461/solar-thermochemical-splitting-of-water-to-generate-hydrogen
#11
C N R Rao, Sunita Dey
Solar photochemical means of splitting water (artificial photosynthesis) to generate hydrogen is emerging as a viable process. The solar thermochemical route also promises to be an attractive means of achieving this objective. In this paper we present different types of thermochemical cycles that one can use for the purpose. These include the low-temperature multistep process as well as the high-temperature two-step process. It is noteworthy that the multistep process based on the Mn(II)/Mn(III) oxide system can be carried out at 700 °C or 750 °C...
May 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28521711/mini-heme-proteins-designability-of-structure-and-diversity-of-functions
#12
Jagdish Rai
Natural heme proteins may have heme bound to poly-peptide chain as a cofactor via non-covalent forces or heme as a prosthetic group may be covalently bound to the proteins. Nature has used porphyrins in diverse functions like electron transfer, oxidation, reduction, ligand binding, photosynthesis, signaling, etc. by modulating its properties through diverse protein matrices. Synthetic chemists have tried to utilize these molecules in equally diverse industrial and medical applications due to their versatile electro-chemical and optical properties...
May 15, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28520898/pyrenoid-loss-impairs-carbon-concentrating-mechanism-induction-and-alters-primary-metabolism-in-chlamydomonas-reinhardtii
#13
Madeline C Mitchell, Gergana Metodieva, Metodi V Metodiev, Howard Griffiths, Moritz T Meyer
Carbon-concentrating mechanisms (CCMs) enable efficient photosynthesis and growth in CO2-limiting environments, and in eukaryotic microalgae localisation of Rubisco to a microcompartment called the pyrenoid is key. In the model green alga Chlamydomonas reinhardtii, Rubisco preferentially relocalises to the pyrenoid during CCM induction and pyrenoid-less mutants lack a functioning CCM and grow very poorly at low CO2. The aim of this study was to investigate the CO2 response of pyrenoid-positive (pyr+) and pyrenoid-negative (pyr-) mutant strains to determine the effect of pyrenoid absence on CCM induction and gene expression...
May 18, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28520766/transcriptomic-analysis-of-salt-stress-responsive-genes-in-rhazya-stricta
#14
Nahid H Hajrah, Abdullah Y Obaid, Ahmed Atef, Ahmed M Ramadan, Dhivya Arasappan, Charllotte A Nelson, Sherif Edris, Mohammed Z Mutwakil, Alawia Alhebshi, Nour O Gadalla, Rania M Makki, Madgy A Al-Kordy, Fotouh M El-Domyati, Jamal S M Sabir, Mohammad A Khiyami, Neil Hall, Ahmed Bahieldin, Robert K Jansen
Rhazya stricta is an evergreen shrub that is widely distributed across Western and South Asia, and like many other members of the Apocynaceae produces monoterpene indole alkaloids that have anti-cancer properties. This species is adapted to very harsh desert conditions making it an excellent system for studying tolerance to high temperatures and salinity. RNA-Seq analysis was performed on R. stricta exposed to severe salt stress (500 mM NaCl) across four time intervals (0, 2, 12 and 24 h) to examine mechanisms of salt tolerance...
2017: PloS One
https://www.readbyqxmd.com/read/28520472/a-study-of-the-microbial-spatial-heterogeneity-of-bahamian-thrombolites-using-molecular-biochemical-and-stable-isotope-analyses
#15
Artemis S Louyakis, Jennifer M Mobberley, Brooke E Vitek, Pieter T Visscher, Paul D Hagan, R Pamela Reid, Reinhard Kozdon, Ian J Orland, John W Valley, Noah J Planavsky, Giorgio Casaburi, Jamie S Foster
Thrombolites are buildups of carbonate that exhibit a clotted internal structure formed through the interactions of microbial mats and their environment. Despite recent advances, we are only beginning to understand the microbial and molecular processes associated with their formation. In this study, a spatial profile of the microbial and metabolic diversity of thrombolite-forming mats of Highborne Cay, The Bahamas, was generated by using 16S rRNA gene sequencing and predictive metagenomic analyses. These molecular-based approaches were complemented with microelectrode profiling and in situ stable isotope analysis to examine the dominant taxa and metabolic activities within the thrombolite-forming communities...
May 2017: Astrobiology
https://www.readbyqxmd.com/read/28516427/the-organism-strikes-back-chlorella-algae-and-their-impact-on-photosynthesis-research-1920s-1960s
#16
Kärin Nickelsen
Historians and philosophers of twentieth-century life sciences have demonstrated that the choice of experimental organism can profoundly influence research fields, in ways that sometimes undermined the scientists' original intentions. The present paper aims to enrich and broaden the scope of this literature by analysing the career of unicellular green algae of the genus Chlorella. They were introduced for the study of photosynthesis in 1919 by the German cell physiologist Otto H. Warburg, and they became the favourite research objects in this field up to the 1960s...
June 2017: History and Philosophy of the Life Sciences
https://www.readbyqxmd.com/read/28516383/genetic-analysis-of-the-lf1-gene-that-controls-leaflet-number-in-soybean
#17
Soon-Chun Jeong, Ji Hong Kim, Dong Nyuk Bae
A high-resolution genetic map that was constructed for the Lf1 -residing region will provide valuable information for map-based cloning and genetic improvement efforts in soybean. Changes in leaf architecture as photosynthesis factories remain a major challenge for the improvement of crop productivity. Unlike most soybeans, which have compound leaves comprising three leaflets, the soybean Lf1 mutant has a high frequency of compound leaves with five leaflets in a partially dominant manner. Here, we generated a fine genetic map to determine the genetic basis of this multifoliolate leaf trait...
May 17, 2017: TAG. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik
https://www.readbyqxmd.com/read/28515731/ectopic-expression-of-cdf3-genes-in-tomato-enhances-biomass-production-and-yield-under-salinity-stress-conditions
#18
Begoña Renau-Morata, Rosa V Molina, Laura Carrillo, Jaime Cebolla-Cornejo, Manuel Sánchez-Perales, Stephan Pollmann, José Domínguez-Figueroa, Alba R Corrales, Jaume Flexas, Jesús Vicente-Carbajosa, Joaquín Medina, Sergio G Nebauer
Cycling Dof Factor (CDF) transcription factors (TFs) are involved in multiple processes related to plant growth and development. A member of this family, CDF3, has recently been linked in Arabidopsis to the regulation of primary metabolism and abiotic stress responses, but its role in crop production under stress is still unknown. In this study, we characterized tomato plants overexpressing the CDF3 genes from Arabidopsis and tomato and analyzed their effects on growth and yield under salinity, additionally gaining deeper insights into the molecular function of these TFs...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28515575/controls-of-primary-production-in-two-phytoplankton-blooms-in-the-antarctic-circumpolar-current
#19
C J M Hoppe, C Klaas, S Ossebaar, M A Soppa, W Cheah, L M Laglera, J Santos-Echeandia, B Rost, D A Wolf-Gladrow, A Bracher, M Hoppema, V Strass, S Trimborn
The Antarctic Circumpolar Current has a high potential for primary production and carbon sequestration through the biological pump. In the current study, two large-scale blooms observed in 2012 during a cruise with R.V. Polarstern were investigated with respect to phytoplankton standing stocks, primary productivity and nutrient budgets. While net primary productivity was similar in both blooms, chlorophyll a -specific photosynthesis was more efficient in the bloom closer to the island of South Georgia (39 °W, 50 °S) compared to the open ocean bloom further east (12 °W, 51 °S)...
April 2017: Deep-sea Research. Part II, Topical Studies in Oceanography
https://www.readbyqxmd.com/read/28515171/mutualistic-damselfish-induce-higher-photosynthetic-rates-in-their-host-coral
#20
Nur Garcia-Herrera, Sebastian C A Ferse, Andreas Kunzmann, Amatzia Genin
Coral reefs are amongst the most diverse ecosystems on Earth where complex inter-specific interactions are ubiquitous. An example of such interactions is the mutualistic relationship between damselfishes and branching corals in the Northern Red Sea, where the fish use corals as shelter and provide them with nutrients, enhance the flow between their branches, and protect them from predators. By enhancing the flow between the coral branches, the fish ventilate the coral's inner zone, mitigating hypoxic conditions that otherwise develop within that zone during the night...
May 15, 2017: Journal of Experimental Biology
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