| acyl-homoserine lactones modulate the settlement rate of zoospores of the marine alga ulva intestinalis via a novel chemokinetic mechanism. | bacteria utilize quorum sensing to regulate the expression of cell density-dependant phenotypes such as biofilm formation and virulence. zoospores of the marine alga ulva intestinalis exploit the acyl-homoserine lactone (ahl) quorum sensing system to identify bacterial biofilms for preferential settlement. here, we demonstrate that ahls act as strong chemoattractants for ulva zoospores. chemoattraction does not involve a chemotactic orientation towards the ahl source. instead, it occurs through ... | 2006 | 17080611 |
| a summary of reports of ulvaceae (chlorophyta) from turkey. | a revised list of the taxa of the ulvaceae occurring in turkey is reported in this research. a total of 25 taxa of this family is herein reported from turkey. also, the transfers of four taxa of enteromorpha to ulva are proposed: ulva intestinalis l. var. asexualis (bliding) e. taskin comb. nov. (enteromorpha intestinalis var. asexualis bliding, 1963), ulva intestinalis forma ramosa (vinogradova) e. taskin comb. nov. (enteromorpha intestinalis forma ramosa vinogradova, 1974), ulva intestinalis f ... | 2007 | 19086565 |
| antiprotozoal, antimycobacterial and cytotoxic potential of some british green algae. | in the continuation of our search for natural sources for antiprotozoal and antitubercular molecules, we have screened the crude extracts of four green marine algae (cladophora rupestris, codium fragile ssp. tomentosoides, ulva intestinalis and ulva lactuca) collected from the dorset area of england. trypanosoma brucei rhodesiense, trypanosoma cruzi, leishmania donovani and mycobacterium tuberculosis were used as test organisms in the in vitro assays. the selective toxicity of the extracts was a ... | 2010 | 19960429 |
| a macroalgal germling bioassay to assess biocide concentrations in marine waters. | a bioassay method using the early life stages (germlings) of macroalgae was developed to detect toxicity of anti-fouling paint biocides. a laboratory based bioassay using ulva intestinalis and fucus spiralis germlings was performed with 4 common anti-fouling biocides (tributyltin (tbt), irgarol 1051, diuron and zinc sulphate), over a range of environmentally relevant concentrations (0.0033-10 μg l(-1)). comparison between the two species showed that germlings of u. intestinalis were better adapt ... | 2015 | 25558019 |
| comparative study of chromium biosorption by red, green and brown seaweed biomass. | dried biomass of the macroalgae fucus vesiculosus and fucus spiralis (brown), ulva spp. (comprising ulva linza, ulva compressa and ulva intestinalis) and ulva lactuca (green), palmaria palmata and polysiphonia lanosa (red) were studied in terms of their chromium biosorption performance. metal sorption was highly ph dependent with maximum cr(iii) and cr(vi) sorption occurring at ph 4.5 and ph 2, respectively. extended equilibrium times were required for cr(vi) binding over cr(iii) binding (180 an ... | 2008 | 17884133 |
| cu(ii) binding by dried biomass of red, green and brown macroalgae. | dried biomass of the marine macroalgae fucus spiralis and fucus vesiculosus (brown), ulva spp. (comprising ulva linza, ulva compressa and ulva intestinalis) and ulva lactuca (green), palmaria palmata and polysiphonia lanosa (red) were studied in terms of their cu(ii) biosorption performance. this is the first study of its kind to compare cu(ii) uptake by these seaweeds in the south-east of ireland. potentiometric and conductimetric titrations revealed a variety of functionalities on the seaweed ... | 2007 | 17234234 |
| epibacterial community patterns on marine macroalgae are host-specific but temporally variable. | marine macroalgae are constantly exposed to epibacterial colonizers. the epiphytic bacterial patterns and their temporal and spatial variability on host algae are poorly understood. to investigate the interaction between marine macroalgae and epiphytic bacteria, this study tested if the composition of epibacterial communities on different macroalgae was specific and persisted under varying biotic and abiotic environmental conditions over a 2-year observation time frame. epibacterial communities ... | 2011 | 21078035 |
| synergistic effects of sulfated polysaccharides from mexican seaweeds against measles virus. | sulfated polysaccharides (sps) extracted from five seaweed samples collected or cultivated in mexico (macrocystis pyrifera, eisenia arborea, pelvetia compressa, ulva intestinalis, and solieria filiformis) were tested in this study in order to evaluate their effect on measles virus in vitro. all polysaccharides showed antiviral activity (as measured by the reduction of syncytia formation) and low cytotoxicity (mtt assay) at inhibitory concentrations. sps from eisenia arborea and solieria filiform ... | 2016 | 27419139 |
| strong endemism of bloom-forming tubular ulva in indian west coast, with description of ulva paschima sp. nov. (ulvales, chlorophyta). | ulva intestinalis and ulva compressa are two bloom-forming morphologically-cryptic species of green seaweeds widely accepted as cosmopolitan in distribution. previous studies have shown that these are two distinct species that exhibit great morphological plasticity with changing seawater salinity. here we present a phylogeographic assessment of tubular ulva that we considered belonging to this complex collected from various marine and estuarine green-tide occurrences in a ca. 600 km stretch of t ... | 2014 | 25329833 |
| seawater temperature alters feeding discrimination by cold-temperate but not subtropical individuals of an ectothermic herbivore. | seawater temperature varies across multiple spatial and temporal scales, yet the roles that such variation play in altering biotic interactions are poorly known. we assessed temperature-mediated feeding behavior exhibited by the herbivorous amphipod ampithoe longimana collected from cold-temperate and subtropical estuaries (27 degrees n and 41 degrees n, respectively). individuals were offered a pairwise feeding choice between lyophilized seaweeds that provide higher fitness (ulva intestinalis) ... | 2009 | 19218494 |
| growth dynamics of ulva rotundata (chlorophyta) in a fish farm: implications for biomitigation at a large scale(1). | changes in biomass of several macroalgae [ulva rotundata bliding; gracilariopsis longissima (s. g. gmel.) steentoft, l. m. irvine et farnham; ulva intestinalis l.; and cladophora sp.] and marine plants (zostera noltii and ruppia cirrhosa) growing naturally in earthen ponds of a fish farm (acuinova, san fernando, southern spain) were recorded during a year. the farm is mainly devoted to the culture of gilthered seabream (sparus aurata). the most conspicuous algal species thriving in the ponds was ... | 2008 | 27041626 |