Asparagopsis armata Harvey is a red alga native from the southern hemisphere and then introduced in Mediterranean Sea Atlantic Ocean, including Azores Archipelago, where it considered an invasive alga. Some studies show that extracts exhibit antimicrobial antifouling activities, incorporated some commercialized cosmetic products. (e.g., Ysaline®). However, knowledge of this species chemical com...

Intertidal mussel species often provide a secondary substrate for competitively inferior species, while excluding them from the primary substrate. To evaluate the net effect, we conducted field experiments that specifically focused on interactions between mussels Septifer virgatus (Miegmann) and algae species. Mussels affected the abundance of 7 algal species differentially, with effects being ...

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...

1. The efficiencies of ferredoxins and flavodoxins from a range of sources as mediators in systems for hydrogen evolution were assessed. 2. In supporting electron transfer from dithionite to hydrogenase of the bacterium Clostridium pasteurianum, highest activity was shown by the ferredoxin from the cyanobacterium Chlorogloeopsis fritschii and flavodoxin from the bacterium Megasphaera elsdenii. ...

The ciliate Paramecium bursaria and the green alga Chlorella species can establish endosymbiosis by mixing them through the host digestive vacuoles. Pulse-labeling of alga-free Paramecium cells with isolated symbiotic algae for 1.5 min and chasing for various times showed presence of four cytological phenomena which are indispensable for the algal reinfection. (1) Some algae acquire temporal re...

Red algae represent an evolutionarily important group that gave rise to the whole red clade of photosynthetic organisms. They contain a unique combination of light-harvesting systems represented by a membrane-bound antenna and by phycobilisomes situated on thylakoid membrane surfaces. So far, very little has been revealed about the mobility of their phycobilisomes and the regulation of their li...

Caulerpa racemosa is a tropical green alga introduced into the Mediterranean probably as an immigrant from the Red Sea. This study evaluated the modifications caused by C. racemosa invasion on the structure of the benthic macroalgal community near Leghorn (northwestern Mediterranean). To achieve this objective, we studied invasion by C. racemosa of algal assemblages on 2 different substrata by ...

Glycolipids were extracted from the red alga Osmundaria obtusiloba from Southeastern Brazilian coast. The acetone insoluble material was extracted with chloroform/methanol and the lipids, enriched in glycolipids, were fractionated on a silica gel column eluted with chloroform, acetone and then methanol. Three major orcinol-positive bands were found in the acetone and methanol fractions, being d...