| ultraviolet radiation-absorbing mycosporine-like amino acids (maas) are acquired from their diet by medaka fish (oryzias latipes) but not by skh-1 hairless mice. | to assess whether vertebrates can acquire, from their diet, ultraviolet radiation-absorbing mycosporine-like amino acids (maas), medaka fish and hairless mice were maintained for 150 and 130 days, respectively, on diets either including mastocarpus stellatus (rich in maas) or the same diets without this red alga. in medaka, the maas palythine and asterina-330, present in trace quantities in the diet with added m. stellatus, were present in significantly greater quantities in the eyes of fish fed ... | 1998 | 9828392 |
| planktonic bacteria and fungi are selectively eliminated by exposure to marine macroalgae in close proximity. | to test whether macroalgae affect microbial colonizers in close proximity in a phylum-specific fashion, the community richness of planktonic bacteria and fungi was analyzed with selective oligonucleotide probes targeting the cytophaga/flavobacterium/bacteroides (cfb), alphaproteobacteria and roseobacter group and the its1 region of marine fungi. naturally occuring planktonic microorganisms were incubated in the presence of macroalgae or in seawater previously conditioned with macroalgal metaboli ... | 2008 | 18194343 |
| floridoside extracted from the red alga mastocarpus stellatus is a potent activator of the classical complement pathway. | many biological properties of algae have been found to have useful applications in human health, particularly in the fields of oncology and immunology. floridoside, extracted from the red alga mastocarpus stellatus, has a structure similar to the xenoantigen gal alpha 1-3 gal. this xenoantigen has been described to induce a high immune response in human xenografts and is mediated by natural anti-gal antibodies that activate the classical complement pathway. based on this property, we analyzed th ... | 2008 | 19005576 |
| antiprotozoal activities of organic extracts from french marine seaweeds. | marine macrophytes contain a variety of biologically active compounds, some reported to have antiprotozoal activity in vitro. as a part of a screening program to search for new natural antiprotozoals, we screened hydroalcoholic and ethyl acetate extracts of 20 species of seaweeds from three phyla (rhodophyta, heterokontophyta and chlorophyta), sampled along the normandy (france) coast. we tested them in vitro against the protozoa responsible for three major endemic parasitic diseases: plasmodium ... | 2011 | 21747738 |
| antiproliferative and antioxidant activities and mycosporine-like amino acid profiles of wild-harvested and cultivated edible canadian marine red macroalgae. | antiproliferative and antioxidant activities and mycosporine-like amino acid (maa) profiles of methanol extracts from edible wild-harvested (chondrus crispus, mastocarpus stellatus, palmaria palmata) and cultivated (c. crispus) marine red macroalgae were studied herein. palythine, asterina-330, shinorine, palythinol, porphyra-334 and usujirene maas were identified in the macroalgal extracts by lc/ms/ms. extract reducing activity rankings were (p < 0.001): wild p. palmata > cultivated c. crispus ... | 2016 | 26805798 |
| population studies and carrageenan properties in eight gigartinales (rhodophyta) from western coast of portugal. | eight carrageenophytes, representing seven genera and three families of gigartinales (florideophyceae), were studied for 15 months. the reproductive status, dry weight, and carrageenan content have been followed by a monthly random sampling. the highest carrageenan yields were found in chondracanthus acicularis (61.1%), gigartina pistillata (59.7%), and chondracanthus teedei var. lusitanicus (58.0%). species of cystocloniaceae family produces predominantly iota-carrageenans; gigartinaceae family ... | 2013 | 24288514 |
| community composition of the planctomycetes associated with different macroalgae. | insights into the diversity of marine natural microbial biofilms, as for example those developing at the surface of marine macroalgae, can be obtained by using molecular techniques based on 16s rrna genes. we applied denaturing gradient gel electrophoresis (dgge) with 16s rrna genes-specific primers for planctomycetes to compare the communities of these organisms developing on six different macroalgae (chondrus crispus, fucus spiralis, mastocarpus stellatus, porphyra dioica, sargassum muticum, a ... | 2014 | 24266389 |
| a physicochemical study of al(+3) interactions with edible seaweed biomass in acidic waters. | in this article, a study of the al(+3) interactions in acidic waters with biomass of different edible seaweeds: brown (fucus vesiculosus, saccorhiza polyschides), red (mastocarpus stellatus, gelidium sesquipedale, chondrus crispus), and green (ulva rigida, codium tomentosum), has been performed. the influence of both, the initial concentration of metal and the solution ph, on the al-uptake capacity of the biomass has been analyzed. from preliminary tests, species fucus vesiculosus and gelidium s ... | 2012 | 22900947 |
| a molecular phylogeny of acrochaete and other endophytic green algae (ulvales, chlorophyta)(1). | a molecular phylogeny was reconstructed from a culture collection of >150 isolates of epi-endophytic and endophytic green algae, based on nucleotide sequences of the plastid tufa and nuclear its2 loci. the cultures were isolated from a variety of algal hosts, notably the red algae chondrus crispus, mastocarpus stellatus, and osmundea species, and the brown algae chorda filum and fucus serratus. the phylogeny revealed that in the ulvales the majority of isolates fell into acrochaete (ulvellaceae) ... | 2012 | 27009012 |
| sensitivity of the early life stages of macroalgae from the northern hemisphere to ultraviolet radiation. | the reproductive cells of macroalgae are regarded as the life history stages most susceptible to various environmental stresses, including uv radiation (uvr). uvr is proposed to determine the upper depth distribution limit of macroalgae on the shore. these hypotheses were tested by uv-exposure experiments, using spores and young thalli of the eulittoral rhodophyceae mastocarpus stellatus and chondrus crispus and various sublittoral brown macroalgae (phaeophyceae) with different depth distributio ... | 2010 | 17645656 |
| seasonal acclimatization of antioxidants and photosynthesis in chondrus crispus and mastocarpus stellatus, two co-occurring red algae with differing stress tolerances. | mastocarpus stellatus and chondrus crispus are red macroalgae that co-dominate the lower rocky intertidal zones of the northern atlantic coast. m. stellatus is more tolerant than c. crispus of environmental stresses, particularly those experienced during winter. this difference in tolerance has been attributed, in part, to greater contents or activities of certain antioxidants in m. stellatus. we compared the photosynthetic capacities and activities of three antioxidant enzymes--superoxide dismu ... | 2004 | 15616353 |
| use of ftir, ft-raman and 13c-nmr spectroscopy for identification of some seaweed phycocolloids. | many seaweeds produce phycocolloids, stored in the cell wall. members of the rhodophyceae produce polysaccharides the main components of which are galactose (galactans)-agar and carrageenan. in addition, alginic acid is extracted from members of the phaeophyceae. this is a binary polyuronide made up of mannuronic acid and guluronic acid. the wide uses of these phycocolloids are based on their gelling, viscosifying and emulsifying properties, which generate an increasing commercial and scientific ... | 2003 | 12919801 |
| carrageenophytes of occidental portuguese coast: 1-spectroscopic analysis in eight carrageenophytes from buarcos bay. | infrared and raman spectroscopic analysis of the carrageenan (alkaline extraction) in eight species (representing seven genera and four families) of gigartinales, in different reproductive phases from buarcos bay (figueira da foz, portugal), were studied. female gametophytes and non-fertile thalli samples of chondrus crispus, mastocarpus stellatus, chondracanthus teedei var. lusitanicus, gigartina pistillata and chondracanthus acicularis present a kappa-carrageenan profile or varying degrees of ... | 2003 | 12919800 |
| extracts of north sea macroalgae reveal specific activity patterns against attachment and proliferation of benthic diatoms: a laboratory study. | a variety of macroalgae (ceramium rubrum, corallina officinalis, palmaria palmata, mastocarpus stellatus, fucus vesiculosus, cladophora rupestris, ulva sp.) were investigated by scanning electron microscopy to visualize epiphytic colonizers. the macroalgae differed in terms of their epiphytic coverage of bacteria, fungi and diatoms. macroalgae, largely devoid of epiphytic diatoms, were hypothesized to employ effective antifouling means to reduce epiphytic coverage, whilst heavily fouled macroalg ... | 2008 | 18092216 |
| assessing the use of the mitochondrial cox1 marker for use in dna barcoding of red algae (rhodophyta). | the red algae, a remarkably diverse group of organisms, are difficult to identify using morphology alone. following the proposal to use the mitochondrial cytochrome c oxidase subunit i (cox1) for dna barcoding animals, we assessed the use of this gene in the identification of red algae using 48 samples plus 31 sequences obtained from genbank. the data set spanned six orders of red algae: the bangiales, ceramiales, corallinales, gigartinales, gracilariales and rhodymeniales. the results indicated ... | 2006 | 21642175 |