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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
Thiago M Batista, Heron O Hilário, Rennan G Moreira, Carolina Furtado, Valéria M Godinho, Luiz H Rosa, Glória R Franco, Carlos A Rosa
Here we report the draft genome sequence of Metschnikowia australis strain UFMG-CM-Y6158, a yeast endemic to Antarctica. We isolated the strain from the marine seaweed Acrosiphonia arcta (Chlorophyta). The genome is 14.3 Mb long and contains 4,442 predicted protein-coding genes.
May 18, 2017: Genome Announcements
S Godavarthi, K Mohan Kumar, E Vázquez Vélez, A Hernandez-Eligio, M Mahendhiran, N Hernandez-Como, M Aleman, L Martinez Gomez
This work focused on the use of waste seaweed Sargassum fluitans (S. fluitans) as carbon source precursor to prepare nitrogen doped carbon dots (NCDs) by hydrothermal method. High resolution transmission electron microscopic (HR-TEM) studies revealed that the synthesized water soluble NCDs are in the size range of 2-8nm and exhibits excellent fluorescent properties with a quantum yield of 18.2%. Elemental nitrogen in NCDs was evidenced by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectrum (FT-IR)...
May 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
Wei-Kang Lee, Yi-Yi Lim, Adam Thean-Chor Leow, Parameswari Namasivayam, Janna Ong Abdullah, Chai-Ling Ho
No abstract text is available yet for this article.
August 1, 2017: Carbohydrate Polymers
Marta Barceló-Villalobos, Félix L Figueroa, Nathalie Korbee, Félix Álvarez-Gómez, Maria H Abreu
This study evaluates the production of biomass and mycosporine-like amino acids (MAAs) throughout the year in Gracilaria vermiculophylla (Rhodophyta) collected in Ria de Aveiro (Portugal). The algae were grown in outdoor tanks in seawater with the addition of fishpond effluents under two different water flows (100 and 200 L h(-1)) in an integrated multi-trophic aquaculture (IMTA) system (tanks 1200 L; 1.5 m(2)) and different algal densities (3, 5, and 7 kg m(-2)). MAA content in IMTA seaweeds was significantly affected by the interaction of time and stocking density, but not by the water flow...
May 13, 2017: Marine Biotechnology
Weihong Zhang, Yuehan Qi, Deyuan Qin, Jixin Liu, Xuefei Mao, Guoying Chen, Chao Wei, Yongzhong Qian
Accurate, stable and fast analysis of toxic inorganic arsenic (iAs) in complicated and arsenosugar-rich algae matrix is always a challenge. Herein, a novel analytical method for iAs in algae was reported, using bromine halogenation and on-line nonpolar solid phase extraction (SPE) followed by hydride generation atomic fluorescence spectrometry (HG-AFS). The separation of iAs from algae was first performed by nonpolar SPE sorbent using Br(-) for arsenic halogenation. Algae samples were extracted with 1% perchloric acid...
August 1, 2017: Talanta
Bogusława Górka, Piotr P Wieczorek
An RP-HPLC-PDA method for the simultaneous analysis of 9 compounds deriving from the phytohormones class was developed and optimized, namely indoleacetic acid (IAA), indolebutyric acid (IBA), phenyleacetic acid (PAA), naphtyleacetic acid (NAA), trans-zeatin (TZ), kinetin (KA), isopentenyladenine (IA), 6-benzylaminopurine (6-BA) and abscisic acid (ABA). Validation of the method was performed on the SFE-CO2 extract made out of the mixture of Baltic algae. The regression coefficients for plant hormones were in the range from 0...
May 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Leonardo J Magnoni, Juan António Martos-Sitcha, Augusto Queiroz, Josep Alvar Calduch-Giner, José Fernando Magalhães Gonçalves, Cristina M R Rocha, Helena T Abreu, Johan W Schrama, Rodrigo O A Ozorio, Jaume Pérez-Sánchez
Intensive aquaculture practices involve rearing fish at high densities. In these conditions, fish may be exposed to suboptimal dissolved O2 levels with an increased formation of reactive O2 species (ROS) in tissues. Seaweeds (SW) contain biologically active substances with efficient antioxidant capacities. This study evaluated the effects of dietary supplementation of heat-treated SW (5% Gracilaria vermiculophylla or 5% Ulva lactuca) on stress bioindicators in seabream subjected to a hypoxic challenge. One hundred and sixty-eight fish (104...
May 11, 2017: Biology Open
Weishan Fang, Decheng Bi, Ruijin Zheng, Nan Cai, Hong Xu, Rui Zhou, Jun Lu, Min Wan, Xu Xu
Alginate, a natural acidic polysaccharide extracted from marine brown seaweeds, is composed of different blocks of β-(1, 4)-D-mannuronate (M) and its C-5 epimer α-(1, 4)-L-guluronate (G). Alginate-derived guluronate oligosaccharide (GOS) readily activates macrophages. However, to understand its role in immune responses, further studies are needed to characterize GOS transport and signalling. Our results show that GOS is recognized by and upregulates Toll-like receptor 4 (TLR4) on RAW264.7 macrophages, followed by its endocytosis via TLR4...
May 10, 2017: Scientific Reports
In-Hye Kim, Mi-Jin Kwon, Taek-Jeong Nam
Fucoidan, a sulfated polysaccharide present in marine brown seaweed, has been demonstrated to inhibit in vivo and in vitro growth of cells. The present study was conducted in HT‑29 human colon cancer cells cultured at a high density, and examined the potential underlying mechanisms by which fucoidan exerts its anti‑proliferative effects, which remain poorly understood. Fucoidan treatment of high‑density HT‑29 cells resulted in the inhibition of cell growth and increased apoptotic cell death. Flow cytometric analysis revealed that fucoidan treatment led to sub‑G1 phase cell cycle arrest...
June 2017: Molecular Medicine Reports
Fasina Makkar, Kajal Chakraborty
In vitro antioxidative and anti-inflammatory bioassay-guided fractionation of the methanol: ethyl acetate crude extract of the thalli of red seaweed Gracilaria opuntia collected from the Gulf of Mannar led to the isolation of a new morpholine alkaloid 3-(2-ethyl-6-((3Z,7Z)-1,2,5,6-tetrahydroazocin-5-yl)hexyl) morpholin-6-one. The substituted azocinyl morpholinone recorded significant 1,1-diphenyl-2-picryl-hydrazil free radical scavenging activities (IC50 ~ 0.086 mg/mL) compared to the commercially available antioxidants, butylated hydroxyanisole, butylated hydroxytoluene, and α-tocopherol (IC50 > 0...
May 8, 2017: Natural Product Research
Nowsheen Goonoo, Archana Bhaw-Luximon, Pearl Passanha, Sandra Esteves, Holger Schönherr, Dhanjay Jhurry
In this paper, the biomineralization potential and cellular response of novel blend films of the anionic sulfated polysaccharides kappa-carrageenan (KCG) and fucoidan (FUC) derived from seaweeds with semi-crystalline polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-valerate (PHBV), respectively, were analyzed. The incorporation of KCG and FUC into PHB and PHBV, which has been studied here for the first time, led to an overall decrease in crystallinity, enhanced surface hydrophilicity, reduced brittleness and faster degradation of the polymer blend films...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Katarzyna Godlewska, Izabela Michalak, Łukasz Tuhy, Katarzyna Chojnacka
Baltic seaweeds were used to obtain aqueous extracts (E) through changing initial pH of deionised water added to algal biomass (EpH3·H2O, EpH7·H2O, and EpH10·H2O) and through changing pH of the mixture of algae and deionised water (EpH3, EpH7, and EpH10). Algal extracts were characterized in terms of the concentration of polyphenols and micro- and macroelements. The highest concentration of polyphenols was determined in extract EpH3 and the lowest in extract EpH10·H2O. It was found that the obtained extracts had similar concentrations of elements (except EpH3)...
2017: BioMed Research International
S Rajeshkumar
Biological synthesis of nanomaterials is a growing innovative approach and it was broadly utilised in the field of nanotechnology and nanomedicine. This study illustrates that biosynthesis of silver nanoparticles (AgNPs) using fucoidan extracted from seaweed Padina tetrastromatica. The functional groups of extracted fucoidan were characterised by Fourier transform infrared spectroscopy (FTIR) and used to NPs synthesis. Synthesised AgNPs were characterised by ultraviolet-visible spectra, scanning electron microscope, energy dispersive X-ray, transmission electron microscope, selected area electron diffraction and FTIR...
April 2017: IET Nanobiotechnology
Rajan Renuka Remya, Santha Ravindranath Radhika Rajasree, Lakshminarayanan Aranganathan, Thodhal Yoganandham Suman, Sathyamoorthy Gayathri
Retinoblastoma is the most common intraocular malignancy basically occurs among children below five. Certain ocular treatments such as surgery, radiation therapy and chemotherapy are more likely to cause side effects. Here, a rapid method of synthesising silver nanoparticles (AgNPs) from the brown seaweed Turbinaria ornata and its cytotoxic efficacy against the retinoblastoma Y79 cell lines was studied. The AgNPs synthesis was determined by Ultraviolet-visible spectroscopy and was further characterised by X-ray diffraction, High-resolution transmission electron microscopy, zeta potential, Energy-dispersive X-ray spectroscopy, thermogravimetric analysis, Fourier transform infrared spectrum and inductively coupled plasma-mass spectroscopy techniques...
February 2017: IET Nanobiotechnology
Vijayan Sri Ramkumar, Arivalagan Pugazhendhi, Kumar Gopalakrishnan, Periyasamy Sivagurunathan, Ganesh Dattatraya Saratale, Thi Ngoc Bao Dung, Ethiraj Kannapiran
Green synthesis of nanoparticles using seaweeds are fascinating high research attention nowadays and also gaining center of attention in biomedical applications. In this work, we have synthesized biocompatible and functionalized silver nanoparticles using an aqueous extract of seaweed Enteromorpha compressa as a reducing as well as stabilizing agent and their efficient antimicrobial and anticancer activity are reported here. The UV-vis spectra of AgNPs showed the characteristics SPR absorption band at 421 nm...
March 2017: Biotechnology Reports
Stefan Kraan
The Asian invasive brown seaweed Undaria pinnatifida was found for the first time in the Republic of Ireland in Kilmore Quay in Co. Wexford in July 2016. As this brown kelp is of considerable economic importance and is cultivated in Asia as well as in Europe, it opens up the discussion if this invasive species is socially acceptable to be cultivated in the Republic of Ireland for food and other purposes. This paper briefly examines the global economic importance, cultivation aspects compared to the European native equivalents such as Alaria esculenta and Saccharina latissima, cultivation yield, economic considerations and the ecological impact of the spread of Undaria into non-native areas...
2017: Journal of Applied Phycology
Jane Teas, Mohammad R Irhimeh
Although relatively rare, melanoma accounts for 2 % of cancer diagnoses globally and accounts for about 1 % of all cancer deaths. Worldwide, the annual incidence of melanoma is 272,000 cases which vary hugely, ranging from Japan where it is incredibly infrequent, to Queensland, Australia, where it is nearly 100 times higher. Based on epidemiology and laboratory studies, there is compelling evidence suggesting that seaweed might be protective against different types of cancers such as breast cancer in seaweed consuming populations...
2017: Journal of Applied Phycology
Laura Castro, M Luisa Blázquez, Felisa González, Jesús A Muñoz, Antonio Ballester
The aim of this work was to demonstrate the feasibility of the application of biosorption in the treatment of metal polluted wastewaters through the development of several pilot plants to be implemented by the industry. The use as biosorbents of both the brown seaweed Fucus vesiculosus and a sugar beet pulp was investigated to remove heavy metal ions from a wastewater generated in an electroplating industry: Industrial Goñabe (Valladolid, Spain). Batch experiments were performed to study the effects of pH, contact time and initial metal concentration on metal biosorption...
April 27, 2017: Science of the Total Environment
In Yung Sunwoo, Jung Eun Kwon, Trung Hau Nguyen, Chae Hun Ra, Gwi-Taek Jeong, Sung-Koo Kim
Conditions for ethanol production were evaluated using waste seaweed obtained from Gwangalli beach, Busan, Korea, after strong winds on January 15, 2015. Eleven types of seaweed were identified, and the proportions of red, brown, and green seaweed wastes were 26, 46, and 28%, respectively. Optimal pretreatment conditions were determined as 8% slurry content, 286 mM H2SO4 for 90 min at 121 °C. Enzymatic saccharification with 16 units/mL Celluclast 1.5L and Viscozyme L mixture at 45 °C for 48 h was carried out as optimal condition...
April 29, 2017: Applied Biochemistry and Biotechnology
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