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https://www.readbyqxmd.com/read/27605045/interspecific-variability-in-phosphorus-induced-lipid-remodelling-among-marine-eukaryotic-phytoplankton
#1
José Pedro Cañavate, Isabel Armada, Ismael Hachero-Cruzado
The response of marine microalgal lipids to phosphorus is of central importance in phytoplankton ecology but remains poorly understood. We determined how taxonomically diverse microalgal species remodelled their lipid class profile in response to phosphorus availability and whether these changes coincided with those already known to occur in land plants and in the limited number of phytoplankton species for which data are available. The complete lipid class profile and specific lipid ratios influenced by phosphorus availability were quantified in two green microalgae and seven Chromalveolates exposed to phosphorus repletion, deprivation and replenishment...
September 8, 2016: New Phytologist
https://www.readbyqxmd.com/read/27474341/enhanced-biomass-production-and-lipid-accumulation-of-picochlorum-atomus-using-light-emitting-diodes-leds
#2
Chae Hun Ra, Chang-Han Kang, Jang-Hyun Jung, Gwi-Taek Jeong, Sung-Koo Kim
The effects of light-emitting diode (LED) wavelength, light intensity, nitrate concentration, and time of exposure to different LED wavelength stresses in a two-phase culture on lipid production were evaluated in the microalga, Picochlorum atomus. The biomass produced by red LED light was higher than that produced by purple, blue, green, or yellow LED and fluorescent lights from first phase of two-phase culture. The highest lipid production of P. atomus was 50.3% (w/w) with green LED light at 2days of second phase as light stress...
October 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27064548/gelatiniphilus-marinus-gen-nov-sp-nov-a-bacterium-from-the-culture-broth-of-a-microalga-picochlorum-sp-122-and-emended-description-of-the-genus-hwangdonia
#3
Mingxing Tang, Li Tan, Hualian Wu, Shikun Dai, Tao Li, Chenghao Chen, Jiaying Li, Jiewei Fan, Wenzhou Xiang, Xiang Li, Guanghua Wang
A Gram-stain-negative, non-motile, non-spore-forming, rod-shaped bacterium, designated strain GYP-24T, was isolated from the culture broth of a marine microalga, Picochlorum sp. 122. Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain GYP-24T forms a robust cluster with H.wangdoniaseohaensis KCTC 32177T (95.8 % sequence similarity) in the family Flavobacteriaceae. Growth of strain GYP-24T was observed at 15, 22, 28, 30, 33 and 37 °C (optimal 30-33 °C), pH 6.0-10.0 (optimal pH 7...
August 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/26716888/audible-sound-treatment-of-the-microalgae-picochlorum-oklahomensis-for-enhancing-biomass-productivity
#4
Weiming Cai, Nurhan Turgut Dunford, Ning Wang, Songming Zhu, Huinong He
It has been reported in the literature that exposure of microalgae cells to audible sound could promote growth. This study examined the effect of sound waves with the frequency of 1100 Hz, 2200 Hz, and 3300 Hz to stimulate the biomass productivity of an Oklahoma native strain, Picochlorum oklahomensis (PO). The effect of the frequency of sound on biomass mass was measured. This study demonstrated that audible sound treatment of the algae cultures at 2200 Hz was the most effective in terms of biomass production and volumetric oil yield...
February 2016: Bioresource Technology
https://www.readbyqxmd.com/read/26476620/pyruvatibacter-mobilis-gen-nov-sp-nov-a-marine-bacterium-from-the-culture-broth-of-picochlorum-sp-122
#5
Guanghua Wang, Mingxing Tang, Hualian Wu, Shikun Dai, Tao Li, Chenghao Chen, Hui He, Jiewei Fan, Wenzhou Xiang, Xiang Li
A Gram-stain-negative, aerobic bacterium, designated strain GYP-11T, was isolated from the culture broth of a marine microalga, Picochloruma sp. 122. Cells were dimorphic rods; free living cells were motile by means of a single polar flagellum, and star-shaped-aggregate-forming cells were attached with stalks and non-motile. Sodium pyruvate or Tween 20 was required for growth on marine agar 2216.16S rRNA gene sequence analysis revealed that this isolate shared 94.07 % similarity with its closest type strain, Parvibaculum hydrocarboniclasticum EPR92T...
January 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/26452656/cumulative-effect-of-zinc-oxide-and-titanium-oxide-nanoparticles-on-growth-and-chlorophyll-a-content-of-picochlorum-sp
#6
Layla J Hazeem, Mohammed Bououdina, Suad Rashdan, Loïc Brunet, Christian Slomianny, Rabah Boukherroub
The use of nanoparticles (NPs) is of increasing significance due to their large potential for various applications. Great attention should be paid on the possible impacts of nanoparticles on the environment as large amounts of them may reach the environment by accident or voluntarily. Marine algae are potential organisms for usage in nanopollution bioremediation in aquatic system, because of their ability to adapt to long exposure to NPs. Thus, it is of prime importance to study the possible interactions of different NPs with microalgae in assessing their potential environmental risks...
February 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/26411640/complete-genome-of-the-marine-bacterium-wenzhouxiangella-marina-kctc-42284-t
#7
Sang-Heon Lee, Hanna Choe, Byung Kwon Kim, Arshan Nasir, Kyung Mo Kim
Wenzhouxiangella marina is an obligatory aerobic, Gram-negative, non-motile, rod-shaped bacterium that was isolated from the culture broth of marine microalgae, Picochlorum sp. 122. Here we report the 3.67 MB complete genome (65.26 G+C%) of W. marina KCTC 42284(T) encoding 3,016 protein-coding genes, 43 tRNAs and one rRNA operon. The genomic information supports multiple horizontal gene transfer (HGT) events in the history of W. marina, possibly with other marine bacteria co-existing in marine habitats. Evaluation of genomic signatures revealed 19 such HGT-derived genomic islands...
December 2015: Marine Genomics
https://www.readbyqxmd.com/read/26363841/aliikangiella-marina-gen-nov-sp-nov-a-marine-bacterium-from-the-culture-broth-of-picochlorum-sp-122-and-proposal-of-kangiellaceae-fam-nov-in-the-order-oceanospirillales
#8
Guanghua Wang, Mingxing Tang, Huanlian Wu, Shikun Dai, Tao Li, Chenghao Chen, Hui He, Jiewei Fan, Wenzhou Xiang, Xiang Li
A Gram-stain-negative, non-motile, non-spore-forming, long rod-shaped bacterium, designated strain GYP-15T, was isolated from the culture broth of a marine microalga, Picochloruma sp. 122. Phylogenetic analyses revealed that strain GYP-15T shared 90.6 % 16S rRNA gene sequence similarity with its closest relative, Kangiella aquimarina KCTC 12183T, and represents a distinct phylogenetic lineage in a robust clade consisting of GYP-15T and members of the genera Kangiella and Pleionea in the order Oceanospirillales...
December 2015: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/26047482/biological-activities-and-chemical-composition-of-methanolic-extracts-of-selected-autochthonous-microalgae-strains-from-the-red-sea
#9
Hugo Pereira, Luísa Custódio, Maria João Rodrigues, Carolina Bruno de Sousa, Marta Oliveira, Luísa Barreira, Nuno da Rosa Neng, José Manuel Florêncio Nogueira, Salman A Alrokayan, Fouzi Mouffouk, Khalid M Abu-Salah, Radhouan Ben-Hamadou, João Varela
Four lipid-rich microalgal species from the Red Sea belonging to three different genera (Nannochloris, Picochlorum and Desmochloris), previously isolated as novel biodiesel feedstocks, were bioprospected for high-value, bioactive molecules. Methanol extracts were thus prepared from freeze-dried biomass and screened for different biological activities. Nannochloris sp. SBL1 and Desmochloris sp. SBL3 had the highest radical scavenging activity against 1,1-diphenyl-2-picrylhydrazyl, and the best copper and iron chelating activities...
June 2015: Marine Drugs
https://www.readbyqxmd.com/read/25964516/phaeodactylibacter-luteus-sp-nov-isolated-from-the-oleaginous-microalga-picochlorum-sp
#10
Xueqian Lei, Yi Li, Guanghua Wang, Yao Chen, Qiliang Lai, Zhangran Chen, Jingyan Zhang, Pingping Liao, Hong Zhu, Wei Zheng, Tianling Zheng
A Gram-staining-negative, orange-pigmented, non-motile, aerobic bacterial strain, designated GYP20T, was isolated from a culture of the alga Picochlorum sp., a promising feedstock for biodiesel production, which was isolated from the India Ocean. Growth was observed at temperatures from 20 to 37 °C, salinities from 0 to 3% and pH from 5 to 9.Mg2+ and Ca2+ ions were required for growth. Phylogenetic analysis based on 16S rRNA gene sequencing revealed that the strain was a member of the genus Phaeodactylibacter, which belongs to the family Saprospiraceae...
August 2015: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/25926963/identification-of-chlorophyceae-based-on-18s-rdna-sequences-from-persian-gulf
#11
Raheem Haddad, Esmat Alemzadeh, Ali-Reza Ahmadi, Ramin Hosseini, Maryam Moezzi
BACKGROUND AND OBJECTIVES: Chlorophyceae are important constituents of marine phytoplankton. The taxonomy of Chlorophyceae was traditionally based solely on morphological characteristics. In the present research project, genetic diversity was investigated to analyze five species of Chlorophyceae from waters of the Persian Gulf. MATERIALS AND METHODS: A clone library of the ribosomal small subunit RNA gene (18S rDNA) in the nuclear genome was constructed by PCR, and then, after examining the clones, selected clones were sequenced...
December 2014: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/25903846/wenzhouxiangella-marina-gen-nov-sp-nov-a-marine-bacterium-from-the-culture-broth-of-picochlorum-sp-122-and-proposal-of-wenzhouxiangellaceae-fam-nov-in-the-order-chromatiales
#12
Guanghua Wang, Mingxing Tang, Tao Li, Shikun Dai, Huanlian Wu, Chenghao Chen, Hui He, Jiewei Fan, Wenzhou Xiang, Xiang Li
A Gram-stain negative, non-motile, non-phototrophic, non-alkaliphilic, obligately aerobic, chemoheterotrophic, and rod-shaped bacterium, designated strain Ma-11(T), was isolated from the culture broth of a marine microalga, Picochloruma sp. 122. Phylogenetic analyses showed that strain Ma-11(T) has less than 91 % similarity to its closest relative, Thioalkalivibrio sulfidiphilus HL-EbGR7(T), represents a distinct phylogenetic lineage in the order Chromatiales, and could not be assigned to any defined families in this order...
June 2015: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/25854208/effect-of-magnetic-iron-oxide-fe%C3%A2-o%C3%A2-nanoparticles-on-the-growth-and-photosynthetic-pigment-content-of-picochlorum-sp
#13
Layla J Hazeem, Fatima Abdul Waheed, Suad Rashdan, Mohamed Bououdina, Loïc Brunet, Christian Slomianny, Rabah Boukherroub, Wael A Elmeselmani
Magnetite iron oxide (Fe3O4) nanoparticles (NPs) are key materials applied in many different fields of modern technology. The potential environmental impact of these NPs is of great concern. In this study, initially the effect of Fe3O4 NPs size (20 and 40 nm) as well as bulk (>100 nm) at 200 mg L(-1) on Picochlorum sp. (Trebouxiophyceae, Chlorophyta) is investigated during the different growth phases. The most inhibitory NPs were then chosen to assess their effects at different concentrations. The 20 nm NPs at 200 mg L(-1) were found to significantly reduce the viable cell concentration and chlorophyll a content during the exponential growth phase compared to the other particle sizes...
August 2015: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/25804790/single-stage-treatment-of-saline-wastewater-with-marine-bacterial-microalgae-consortia-in-a-fixed-bed-photobioreactor
#14
P Babatsouli, S Fodelianakis, N Paranychianakis, D Venieri, M Dialynas, N Kalogerakis
Currently, the treatment of aquaculture-origin effluents is mainly performed through land-based recirculating aquaculture systems (RAS). In this study, we evaluate and introduce a novel immobilized/packed bed bioreactor which uses a synthetic textile as the support medium. A marine microbial consortium was developed on the textile by its inoculation with the microalgae Picochlorum sp. The bioreactor was tested with variable loadings of C and N and showed outstanding performance approaching removal rates up to 95% within a few hours (4-5h) of operation...
July 15, 2015: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/25141628/vibrio-static-activity-in-the-culture-of-the-picochlorum-sp-s1b-can-be-attributed-to-the-bacteria-associated-with-the-microalga
#15
Y H Chang, J C Kuo, Y M Chen
No abstract text is available yet for this article.
2013: Communications in Agricultural and Applied Biological Sciences
https://www.readbyqxmd.com/read/24965277/genome-of-the-halotolerant-green-alga-picochlorum-sp-reveals-strategies-for-thriving-under-fluctuating-environmental-conditions
#16
Fatima Foflonker, Dana C Price, Huan Qiu, Brian Palenik, Shuyi Wang, Debashish Bhattacharya
An expected outcome of climate change is intensification of the global water cycle, which magnifies surface water fluxes, and consequently alters salinity patterns. It is therefore important to understand the adaptations and limits of microalgae to survive changing salinities. To this end, we sequenced the 13.5 Mbp genome of the halotolerant green alga Picochlorum SENEW3 (SE3) that was isolated from a brackish water pond subject to large seasonal salinity fluctuations. Picochlorum SE3 encodes 7367 genes, making it one of the smallest and most gene dense eukaryotic genomes known...
February 2015: Environmental Microbiology
https://www.readbyqxmd.com/read/24663114/a-novel-lipid-extraction-method-from-wet-microalga-picochlorum-sp-at-room-temperature
#17
Fangfang Yang, Wenzhou Xiang, Xiumei Sun, Hualian Wu, Tao Li, Lijuan Long
A novel method using ethanol was proposed for extracting lipids from wet microalga Picochlorum sp. at room temperature and pressure. In this study, Central Composite design (CCD) was applied to investigate the optimum conditions of lipid extraction. The results revealed that the solvent to biomass ratio had the largest effect on lipid extraction efficiency, followed by extraction time and temperature. A high lipid extraction yield (33.04% of the dry weight) was obtained under the following extraction conditions: 5 mL solvents per gram of wet biomass for 37 min with gentle stirring at room temperature...
March 2014: Marine Drugs
https://www.readbyqxmd.com/read/24531691/vertical-physico-chemical-gradients-with-distinct-microbial-communities-in-the-hypersaline-and-heliothermal-lake-ursu-sovata-romania
#18
István Máthé, Andrea K Borsodi, Erika M Tóth, Tamás Felföldi, Laura Jurecska, Gergely Krett, Zsolt Kelemen, Erzsébet Elekes, Katalin Barkács, Károly Márialigeti
The effect of vertical physico-chemical stratification on the planktonic microbial community composition of the deep, hypersaline and heliothermal Lake Ursu (Sovata, Romania) was examined in this study. On site and laboratory measurements were performed to determine the physical and chemical variables of the lake water, and culture-based and cultivation-independent techniques were applied to identify the members of microbial communities. The surface of the lake was characterized by a low salinity water layer while the deepest region was extremely saline (up to 300 g/L salinity)...
May 2014: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/24301903/optimisation-of-the-critical-medium-components-for-better-growth-of-picochlorum-sp-and-the-role-of-stressful-environments-for-higher-lipid-production
#19
Ines Dahmen, Haifa Chtourou, Ahlem Jebali, Dhouha Daassi, Fatma Karray, Ilem Hassairi, Sami Sayadi, Slim Abdelkafi, Abdelhafidh Dhouib
BACKGROUND: Coastal countries that suffer from a scarcity of water, such as Tunisia, have to cultivate marine microalgae on non-arable land in order to produce feedstock and overcome their demands of nutrition and energy. In this framework, a green microalga, CTM 20019, was isolated, identified as Picochlorum sp. and tested for its lipid production. RESULTS: The dry weight of Picochlorum sp. is composed of 163 g kg(-1) lipids, 225 g kg(-1) total sugars, 440 g kg(-1) proteins and 112 g kg(-1) ash rich in potassium, calcium, iron, magnesium and zinc...
June 2014: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/23667639/salinity-tolerance-of-picochlorum-atomus-and-the-use-of-salinity-for-contamination-control-by-the-freshwater-cyanobacterium-pseudanabaena-limnetica
#20
Nicolas von Alvensleben, Katherine Stookey, Marie Magnusson, Kirsten Heimann
Microalgae are ideal candidates for waste-gas and -water remediation. However, salinity often varies between different sites. A cosmopolitan microalga with large salinity tolerance and consistent biochemical profiles would be ideal for standardised cultivation across various remediation sites. The aims of this study were to determine the effects of salinity on Picochlorum atomus growth, biomass productivity, nutrient uptake and biochemical profiles. To determine if target end-products could be manipulated, the effects of 4-day nutrient limitation were also determined...
2013: PloS One
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