Six new compounds, omaezol, intricatriol, hachijojimallenes A and B, debromoaplysinal, and 11,12-dihydro-3-hydroxyretinol have been isolated from four collections of Laurencia sp. These structures were determined by MS and NMR analyses. Their antifouling activities were evaluated together with eight previously known compounds isolated from the same samples. In particular, omaezol and hachijojim...

Hexane, chloroform, methanol, chloroform: methanol (2:1 v/v) and petroleum ether extracts of Turbinaria conoides from the coast of Mandapam were tested in vitro for their antibacterial activities against Escherichia coli, Salmonella typhi, Staphylococcus aureus, Pseudomonas aeruginosa and Proteus mirabilis with the disc diffusion method. Petroleum ether was the best solution for extracting the ...

This study describes an investigation into secondary metabolites that are produced by a marine red alga, Symphyocladia latiuscula, which was collected from coastal waters off Qingdao, China. A combination of normal, reversed phase, and gel chromatography was used to isolate six citric acid derived natural products, aconitates A-F (1-6), together with two known and ten new polybrominated phenols...

Although some alginate lyases have been isolated from marine bacteria, alginate lyases-excreting bacteria from the Arctic alga have not yet been investigated. Here, the diversity of the bacteria associated with the brown alga Laminaria from the Arctic Ocean was investigated for the first time. Sixty five strains belonging to nine genera were recovered from six Laminaria samples, in which Psychr...

Herbivory has long been considered an important component of biotic resistance against macroalgae invasions in marine habitats. However, most the studies on herbivory invasive algae refer only to consumption by strictly herbivorous organisms, whereas omnivorous species largely ignored and rarely quantified. In this study, we assess whether commonest sparid Mediterranean Sea are consuming highly...

to study the impact of growth factor bacteria , humic acid  and alga extract in drought stress condition  a test is established in form of completely random blocks  and spilt plot  in 4 replications  in a field in mahallat in arak  province in 1389. two primary plots including irrigation and stress  and secondary  plots including  growth factor bacteria ,humic acid  and  alga extract, ascophylu...

Understanding the feeding preferences of abalone (high-value marine herbivores) is integral to new species development in aquaculture because of the expected link between preference and performance. Performance relates directly to the nutritional value of algae--or any feedstock--which in turn is driven by the amino acid content and profile, and specifically the content of the limiting essentia...

Marine algae are a promising alternative feedstock for biosugar production since they rich in carbohydrate content, do not compete with food crops land, and fast growing. This study used the marine Kappaphycus alvarezii as to produce biosugar. In order convert algal biomass biosugar, hydrolysis is needed breakdown complex structure of lignocellulosic material tissues. this study, process was pe...

A new geographic record of the oomycete Olpidiopsis feldmanni infecting the tetrasporophytic stage of the red alga Asparagopsis sp. from the Adriatic Sea, confirmed through morphological identification, allowed us to expand previous observations of this organism. Ultrastructural investigations of environmental material showed a large central vacuole and a cell wall thicker than previously repor...

Oxidative stress and antioxidant defence systems were assessed in a marine brown alga Padina tetrastromatica, commonly occurring from the tropics. Lipid peroxidation (LPX) and H2O2 were measured as oxidative stress markers, and antioxidant defences were measured as catalase (CAT), glutathione S-transferase (GST) and ascorbic acid (AsA), in order to understand their dissimilarity with respect to...