| evaluation of the marine alga ulva rigida as a food supplement: effect of intake on intestinal, hepatic, and renal enzyme activities in rats. | the use of seaweeds as a food is more widespread in eastern than in western countries, although demand for these plants has increased in the west because their possible usefulness as dietary supplements. however, very little is known about the effects of regular consumption of algae. the aim of the present study was to determine the composition of ulva rigida and to evaluate the effects of dietary supplementation of the diet with 10% alga for 4 weeks on dietary intake, growth, protein efficiency ... | 2010 | 21128822 |
| ulva rigida improves carbohydrate metabolism, hyperlipidemia and oxidative stress in streptozotocin-induced diabetic rats. | this study was designed to investigate the effects of ulva rigida, one of the green algae, on the lipid profile and oxidative-antioxidative systems in streptozotocin-induced diabetic rats. forty wistar rats randomly divided into four groups: control (c), control?+?u. rigida extract (c?+?ure), diabetes (d) and diabetes?+?u. rigida extract (d?+?ure). u. rigida (2%) was administered in drinking water for 5 weeks after the induction of diabetes. u. rigida reduced the blood glucose, serum total chole ... | 2011 | 21370246 |
| evaluation of ultrasonic, acid, thermo-alkaline and enzymatic pre-treatments on anaerobic digestion of ulva rigida for biogas production. | pre-treatment of macroalgae has received considerable research globally due to its influence on the technical, economic and environmental sustainability of algae biogas production. some of the most promising pre-treatment methods require the application of chemicals, enzymatic, and mechanical. this study focused on these pre-treatments of ulva rigida for biogas production. the evaluation of different pre-treatment in terms of reducing sugar yields demonstrates that 3.62, 2.88, 2.53 and 7.3g/l of ... | 2015 | 25855526 |
| arsenosugars and other arsenic compounds in littoral zone algae from the adriatic sea. | in 10 different marine algae from the littoral zone (found between the highest and lowest tide marks on the seashore) arsenic compounds were determined by means of a high-performance liquid chromatography (anion and cation exchange)-uv photochemical digestion-hydride generation-atomic fluorescence spectrometry (hplc-uv-hgafs) system. samples (ceramium sp., cystoseira barbata, enteromorpha sp., fucus virsoides, two different species of gelidium, padina pavonica, polisyphonia sp. and ulva rigida) ... | 2006 | 16289244 |
| Determination of Water-Soluble Arsenic Compounds in Commercial Edible Seaweed by LC-ICPMS. | This paper reports arsenic speciation in edible seaweed (from the Galician coast, northwestern Spain) produced for human consumption. Chondrus crispus , Porphyra purpurea , Ulva rigida , Laminaria ochroleuca , Laminaria saccharina , and Undaria pinnatifida were analyzed. The study focused on arsenosugars, the most frequently occurring arsenic species in algae. As(III) and As(V) were also determined in aqueous extracts. Total arsenic in the samples was determined by microwave digestion and ... | 2011 | 22082352 |
| seasonal concentrations of some heavy metals (cd, pb, zn, and cu) in ulva rigida j. agardh (chlorophyta) from dardanelles (canakkale, turkey). | in this study, changes in heavy metal accumulation in u. rigida j. agardh taxon and seawater have been investigated with respect to different stations and seasons. for this purpose, the severity of heavy metal pollution in the dardanelles has been presented through the determination of cu, pb, zn, and cd concentrations in u. rigida macroalgae and seawater taken seasonally from the stations located on six different regions on the strait. while the metal concentrations in alga specimens were found ... | 2011 | 20714931 |
| composition, nutritional aspects and effect on serum parameters of marine algae ulva rigida. | algae are commonly consumed in asia and have also gained popularity in europe. however, data on the bioavailability of their components are limited. the present study was designed to determine the composition of ulva rigida and the effects of inclusion of 10% of the algae in a standard diet for 4 weeks on nutritive value and serum parameters in order to consider the usefulness of ulva as a dietary supplement. | 2010 | 20355066 |
| anti-hyperglycemic and antigenotoxic potential of ulva rigida ethanolic extract in the experimental diabetes mellitus. | an increased reactive oxygen species (ros) and insufficient antioxidant activity is known in diabetes mellitus (dm). antioxidant compounds in the human foods or supplementary diets can be used to counteract several diseases. the analysis of micronuclei (mn) is a cytogenetic technique used to show chromosomal damage caused by clastogenic affects. the present study was designed to evaluate: (i) the effects of diabetes mellitus on bone marrow mn frequency, (ii) the effect of oral administration of ... | 2009 | 19422873 |
| in vitro antigenotoxicity of ulva rigida c. agardh (chlorophyceae) extract against induction of chromosome aberration, sister chromatid exchange and micronuclei by mutagenic agent mmc. | to determine the in vitro possible clastogenic and cytotoxic activities of ulva rigida crude extracts (ure), and identify their antigenotoxic and protective effects on chemotherapeutic agent mitomycine-c (mmc). | 2008 | 19263805 |
| sequential toxicity identification evaluation (tie) for characterizing toxicity of venice lagoon sediments: comparison of two different approaches. | a toxicity identification evaluation phase-i (tie-1) procedure was carried out on five pore water samples extracted from sediments of the venice lagoon previously investigated to assess both chemical contamination and toxic effects on the biota. two different sequential tie procedures were tested. a first sequence (tie-1) provided for adding na2s2o3, adding na-edta, filtering, elution through a c18-spe column and removing ammonia using the macroalgae ulva rigida agardh 1823, while a second proce ... | 2009 | 18722012 |
| seasonal variations of selected herbicides and related metabolites in water, sediment, seaweed and clams in the sacca di goro coastal lagoon (northern adriatic). | this study assesses the status of sacca di goro coastal lagoon (northern adriatic, italy) with respect to watershed pollution. because 80% of its watershed is devoted to agriculture, plant protection products and their metabolites were found in the water column, sediments (the upper 0-15 cm layer), macroalgae (ulva rigida) and clams (tapes philippinarum). five seasonal sampling campaigns were performed from may 2004 to april 2005 and concentrations measured in five stations in the lagoon and six ... | 2007 | 17610932 |
| effect of eutrophication upon radionuclide dynamics in the sacca di goro lagoon (po river delta, italy): a combined field, experimental and modeling study. | the focus of this paper is on the relationship between eutrophication and radionuclide circulation at the whole ecosystem scale in the shallow estuarine environment of the sacca di goro (po river delta, italy). this lagoon is frequently affected by dystrophic crises, due to decomposition of huge amounts of macroalgae (mainly ulva rigida), and critical conditions created at the interface between sediment and water are such that cs-137 accumulated in the sediment can be mobilized and made availabl ... | 2003 | 12826421 |
| role of protective and repair mechanisms in the inhibition of photosynthesis in marine macroalgae. | the mechanism of photoinhibition was investigated in three representative macroalgal species growing on the coast of patagonia: the chlorophyte ulva rigida c. agardh, the rhodophyte porphyra columbina montagne and the phaeophyte dictyota dichotoma (huds.) lamour. dark adapted specimens were exposed to 15 min unfiltered solar radiation to induce photoinhibition, and subsequently the recovery of the photosynthetic quantum yield was followed for up to 6 h. photoinhibition is believed to be due to t ... | 2002 | 12656483 |
| heavy metal contamination in the seaweeds of the venice lagoon. | the concentrations of heavy metals (fe, zn, cu, cd, ni, pb, cr, as) were determined in seven seaweeds of environmental and commercial relevance (ulva rigida c. ag., gracilaria gracilis (stackhouse) steentoft, l. irvine and farnham, porphyra leucosticta thuret, grateloupia doryphora (montagne) howe., undaria pinnatifida (harv.) suringar, fucus virsoides j. agardh, cystoseira barbata (good. et wood.) ag.) collected in four sampling sites in the lagoon of venice, in spring and autumn 1999. metals w ... | 2002 | 11999620 |
| nmr spectroscopic characterisation of oligosaccharides from two ulva rigida ulvan samples (ulvales, chlorophyta) degraded by a lyase. | the chemical structure and the sequence of repeating units in ulvans of similar compositions from two different ulva rigida samples collected in the canary islands and in brittany were studied after ulvan-lyase degradation and nmr spectroscopic analysis of the reaction products. both ulvans were composed of ulvanobiuronic acid 3-sulfate type a [-->4)-beta-d-glca-(1-->4)-alpha-l-rha 3-sulfate-(1-->] (symbolised as a3s) and contained disaccharides composed of [-->4)-beta-d-xyl-(1-->4)-alpha-l-rha ... | 1998 | 10230036 |
| metal accumulation in a biological indicator (ulva rigida) from the lagoon of venice (italy). | ulva rigida (c. agardht) was collected from the palude della rosa (lagoon of venice), a particular area characterized by a salinity gradient, from december 1991 to june 1993. metal contents (al, mn, fe, cu, zn, cr, co, ni, cd, and pb) were determined by atomic absorption spectrophotometry and statistically analysed for differences between months and sampling sites. the mean seasonal variability is very significant (p < 0.001) for all studied metals. seasonal trends are comparable for groups of m ... | 1996 | 8687985 |
| attachment point theory revisited: the fouling response to a microtextured matrix. | this paper examines attachment point theory in detail by testing the fouling attachment of several fouling groups to a microtextured matrix. static bioassays were conducted on polycarbonate plates with nine equal regions, comprising eight scales of microtexture (4-512 microm) and one untextured region. the microtextures examined were continuous sinusoidal ridges and troughs of defined height and width. attachment over the microtextured plates was examined for the diatom amphora sp., the green al ... | 2008 | 18066730 |
| the role of nano-roughness in antifouling. | nano-engineered superhydrophobic surfaces have been investigated for potential fouling resistance properties. integrating hydrophobic materials with nanoscale roughness generates surfaces with superhydrophobicity that have water contact angles (theta) >150 degrees and concomitant low hysteresis (<10 degrees ). three superhydrophobic coatings (shcs) differing in their chemical composition and architecture were tested against major fouling species (amphora sp., ulva rigida, polysiphonia sphaerocar ... | 2009 | 20183134 |
| alkyllead species in the coastal waters of alexandria, egypt. | fourteen locations were sampled along the alexandria coast to assess the occurrence and fate of alkyllead compounds in water, sediments and biota. tetraalkyllead was not observed in any of the samples analyzed. pbme(3)(+) dominated the methyllead species in water (constituting 62-64% of total alkyllead) reaching 1506 ng kg(-1) opposite the alkyllead production plant. pbet(3)(+) dominated the ethyllead species constituting 18-20% of total alkyllead species with a maximum concentration of 902 ng k ... | 1996 | 15091456 |
| the use of seaweed from the galician coast as a mineral supplement in organic dairy cattle. | this study was designed to assess the value of seaweeds from the galician coast as a source of minerals (especially iodine (i) but also other micro-minerals) in organic dairy cattle. it was conducted in an organic dairy farm in the lugo province that typically represents the organic milk production in nw spain. the animal's diet consisted mainly of local forage (at pasture or as hay and silage in the winter) and 5 kg of purchased concentrate/day per animal (representing 23.5% of feed intake). ba ... | 2014 | 24438753 |
| production and characterization of enzymatic cocktail produced by aspergillus niger using green macroalgae as nitrogen source and its application in the pre-treatment for biogas production from ulva rigida. | marine macroalgae are gaining more and more importance as a renewable feedstock for durable bioenergy production, but polysaccharides of this macroalgae are structurally complex in its chemical composition. the use of enzymatic hydrolysis may provide new pathways in the conversion of complex polysaccharides to fermentable sugars. in this study, an enzymatic cocktail with high specificity was first isolated from aspergillus niger using the green macroalgae ulva rigida as nitrogen source. the cock ... | 2016 | 27285578 |
| optimization of marine waste based-growth media for microbial lipase production using mixture design methodology. | lipase production by staphylococcus xylosus and rhizopus oryzae was investigated using a culture medium based on a mixture of synthetic medium and supernatants generated from tuna by-products and ulva rigida biomass. the proportion of the three medium components was optimized using the simplex-centroid mixture design method (scmd). results indicated that the experimental data were in good agreement with predicted values, indicating that scmd was a reliable method for determining the optimum mixt ... | 2013 | 24350480 |
| 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 |