Dengue is a significant public health problem worldwide. Despite the important social and clinical impact, there is no vaccine or specific antiviral therapy for prevention and treatment of dengue virus (DENV) infection. Considering the above, drug discovery research for dengue is of utmost importance; in addition natural marine products provide diverse and novel chemical structures with potent ...

Members of the genera Phytophthora de Bary and Pythium Pringsheim are economically important “fungal-like-organisms” or “pseudofungi” which have been widely studied throughout the world but their taxonomic treatment has been highly controversial. The production of globose oogonia in the sexual reproduction has placed them in the phylum Oomycota. Although members of Oomycota are similar to all f...

Rates of macroalgal carbon monoxide (CO) production were compared among 5 taxa representing 3 major phylogenetic groups (Phaeophyta, Chlorophyta, Rhodophyta). CO production varied substantially from a minimum of about 20 ng CO gdw–1 h–1 for Fucus vesiculosus to >4000 ng CO gdw–1 h–1 for Laminaria saccharina. None of the macroalgae examined contained significantly elevated CO concentrations with...

Sensitivity to ultraviolet (UV) radiation (UV-A, lambda = 315-400 nm; plus UV-B, lambda = 280-315 nm) of zygotes of the brown alga Fucus serratus L. (Phaeophyta) has been assessed through effects on growth of developing germlings. Different stages of development were distinguished by considering 5 h periods of time after fertilisation. Both the stage of the zygote and the UV radiation condition...

Among the three main divisions of marine macroalgae (Chlorophyta, Phaeophyta and Rhodophyta), marine green algae are valuable sources of structurally diverse bioactive compounds and remain largely unexploited in nutraceutical and pharmaceutical areas. Recently, a great deal of interest has been developed to isolate novel sulfated polysaccharides (SPs) from marine green algae because of their nu...

In Ochromonas danica and two related species (Chrysophyceae) and in Rhodomonas lens and Cryptomonas sp. (Cryptophyceae), the chloroplast is surrounded by an outer double-membraned envelope which lies outside the usual double-membraned chloroplast envelope. At the borders of the area where the chloroplast lies adjacent to the nucleus, this outer envelope is continuous with the outer membrane of ...

Photosynthesis, Dark Fixation, /?-Carboxylation, C4-Metabolism, Brown Algae Marine brown macroalgae including Macrocystis integrifolia, Nereocystis luetkeana, Lessoniopsis littoralis, Laminaria saccharina, Fucus serratus and some further representatives of the Laminariales and Fucales (Phaeophyta) have been investigated with respect to their remarkably high potential for /?-carboxylation of pho...

Anticoagulant properties of marine algae have been extensively studied for the last 60 years. Sulphated polysaccharides (SPS) of three major divisions of marine algae, viz. Rhodophyta, Phaeophyta and Chlorophyta are reported to have such properties. Some of the active components have been chemically well characterized. Sulphated galactans and fucoidan sulphates from red and brown algae, respect...

In contrast to the generally boron-poor terrestrial environment, the concentration of boron in the marine environment is relatively high (0.4 mM) and while there has been extensive interest in its use as a surrogate of pH in paleoclimate studies in the context of climate change-related questions, the relatively depth independent, and the generally non-nutrient-like concentration profile of this...

Bacteria and allied micro-organisms are of direct economic concern to man in many ways besides causing diseases and bringing about the decomposi tion of marine a,nimals and commercial algae . There are many p roblems in the general economy of the ocean , the solu tio n of which requi res the a id of the microbio log ist. The m ic ro-organisms belong to a wide range of groups and include bacteri...