A5011897836- Marine and coastal plant biology
- Coral and Marine Ecosystems Studies
- Seaweed-derived Bioactive Compounds
- Marine Biology and Ecology Research
- Marine Biology and Environmental Chemistry
- Marine and fisheries research
- Algal biology and biofuel production
- Marine Sponges and Natural Products
- Heavy metals in environment
- Diatoms and Algae Research
- Ocean Acidification Effects and Responses
- Myxozoan Parasites in Aquatic Species
- Polysaccharides and Plant Cell Walls
- Cellular Mechanics and Interactions
- Coastal and Marine Management
- Marine Ecology and Invasive Species
- Protist diversity and phylogeny
- Biocrusts and Microbial Ecology
- Antimicrobial Peptides and Activities
- Protein Hydrolysis and Bioactive Peptides
- Cephalopods and Marine Biology
- Paleontology and Stratigraphy of Fossils
- Calcium Carbonate Crystallization and Inhibition
- Maritime and Coastal Archaeology
- Force Microscopy Techniques and Applications
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
2015-2024
Universidade Federal de Pernambuco
2021
Universidade Federal do Rio de Janeiro
2003-2008
Universidade Federal Fluminense
2008
Rhodoliths are nodules of non-geniculate coralline algae that occur in shallow waters (<150 m depth) subjected to episodic disturbance. Rhodolith beds stand with kelp beds, seagrass meadows, and algal reefs as one the world's four largest macrophyte-dominated benthic communities. Geographic distribution rhodolith is discontinuous, large concentrations off Japan, Australia Gulf California, well Mediterranean, North Atlantic, eastern Caribbean Brazil. Although there major gaps terms seabed...
Recent studies indicate that the cell membrane, interacting with its attached cytoskeleton, is an important regulator of function, exerting and responding to forces. We investigate this relationship by looking for connections between membrane elastic properties, especially surface tension bending modulus, function. Those properties are measured pulling tethers from optical tweezers. Their values determined all major types central nervous system, as well macrophage. Astrocytes glioblastoma...
The reef system off the Amazon River mouth extends from Amapá state to Maranhão along Brazilian Equatorial Margin, encompassing more than 10,000 km2 of rhodolith beds and high-relief hard structures on outer shelf upper slope. This unique bottom mosaic is remarkable for being influenced by turbid hyposaline plume world’s largest river, also representing a connectivity corridor between Caribbean Brazil. Bryozoans were recently recognized as major builders in Southwestern Atlantic, but their...
Abstract Background Seaweeds of the Laurencia genus have a broad geographic distribution and are largely recognized as important sources secondary metabolites, mainly halogenated compounds exhibiting diverse potential pharmacological activities relevant ecological role anti-epibiosis. Host-microbe interaction is driving force for co-evolution in marine environment, but molecular studies seaweed-associated microbial communities still rare. Despite large amount research describing chemical...
PEREIRA-FILHO, G.H.; AMADO-FILHO, G.M.; MOURA, R.L.; BASTOS, A.C.; GUIMARÃES, S.M.P.B.; SALGADO, L.T.; FRANCINI-FILHO, R.B.; BAHIA, R.G.; ABRANTES, D.P.; GUTH, A.Z., and BRASILEIRO, P.S., 2012. Extensive rhodolith beds cover the summits of southwestern Atlantic Ocean seamounts.Calcium carbonate production by marine organisms is an essential process in global budget , coralline reefs are most important benthic producers. Crustose algae (CCA) well recognized as builders tropical Brazilian...
Glycolytic enzymes reversibly associate with the human erythrocyte membrane (EM) as part of their regulatory mechanism. The site for this association has been described amino terminus band 3, a transmembrane anion transporter. Binding glycolytic to is recognized inhibit glycolysis, since binding inhibits catalytic activity these enzymes, including rate-limiting enzyme 6-phosphofructo-1-kinase (PFK). However, existence putative stimulatory within EM proposed. PFK able other proteins, such...
The interaction between phenolic substances (PS) and alginates (ALG) has been suggested to play a role in the structure of cell walls brown seaweeds. However, no clear evidence for this was reported. Vanadium bromoperoxidase (VBPO) proposed as possible catalyst binding PS ALG. In work, we studied ALG from algae using size exclusion chromatography (SEC) optical tweezers microscopy. analysis by SEC revealed that forms high-molecular-weight complex with PS. To study formation molecular complex,...
Tropical reefs are declining rapidly due to climate changes and local stressors such as water quality deterioration overfishing. The so-called marginal sustain significant coral cover growth but dominated by fewer species adapted suboptimal conditions most species. However, the dynamics of systems may diverge from that archetypical oligotrophic tropical reefs, it is unclear whether they more or less susceptible anthropogenic stress. Here, we present largest (100 fixed quadrats at five reefs)...
Natural within-thallus concentrations of elatol produced by Laurencia obtusa (Huds.) J. V. Lamour. inhibit herbivory and prevent fouling. However, occurs in larger amounts within the thallus compared with quantities from surface this alga. We evaluated whether both fouling content corps en cerise can be transferred to external cell walls. Surface did not sea urchins, settlement barnacle larvae, or mussel attachment. Evidence a connection between cerise, where is probably stored, wall L. was...
In clones of the red alga Laurencia obtusa, frequency vesicle transport from corps en cerise (CC) to cell wall region was evaluated in response differences temperature, irradiance, desiccation, bacterial fouling, and bromine (Br) availability. addition, morphology analyzed. Traffic vesicles induced by exposing L. obtusa low temperatures variations irradiance. It also verified that fouling traffic. Under high membranous tubular connections were lost not seen. The varied according availability...
The abundance of reef builders, non-builders and the calcium carbonate produced by communities established in Calcification Accretion Units (CAUs) were determined three Abrolhos Bank shallow reefs during period from 2012 to 2014. In addition, seawater temperature, irradiance, amount composition sediments determined. inner outer arcs compared. CAUs located on shelf under influence terrigenous sediments. On reefs, composed primarily marine biogenic carbonates. mean production was 579 ± 98 g...
Most coral reefs have recently experienced acute changes in benthic community structure, generally involving dominance shifts from slow-growing hard corals to fast-growing invertebrates and fleshy photosynthesizers. Besides overfishing, increased nutrification sedimentation are important drivers of this process, which is well documented at landscape scales the Caribbean Indo-Pacific. However, small-scale processes that occur level individual organisms remain poorly explored. In addition,...
Allelopathy and autotoxicity are well-known biological processes in angiosperms but very little explored or even unknown seaweeds. In this study, extract major pure compounds from two distinct populations of the red seaweed Laurencia dendroidea were investigated to evaluate effect through auto- crossed experiments under laboratory conditions, using chlorophyll fluorescence imaging measure inhibition photosynthesis (ΦPSII) as a variable response. Individuals L. Azeda beach inhibited by their...
Rhodolith beds are biogenic benthic habitats mainly formed by unattached, non-geniculate coralline algae, which can be inhabited many associated species. The Brazilian continental shelf encompasses the largest continuous rhodolith bed in world. This study was based on samples obtained from seven sites and videos taken a Remotely Operated Vehicle (ROV) at four transects off Sergipe-Alagoas Coast northeast shelf. ROV operations bottom trawl sampling revealed occurrence of between 25 54 m...
Brown algae phenolic compounds (PC) are secondary metabolites that participate in many biological processes, such as ultraviolet radiation (UV) protection, polyspermy blocking and trace metals bounding. Recently, PC has also been studied due to possible interactions with cell wall polysaccharides. However, there few evidences of these their influence physiological processes. The between from the brown alga Padina gymnospora alginates on UV absorption properties were investigated this work....
Trypanosoma cruzi epimastigotes store high amounts of cholesterol and cholesteryl esters in reservosomes. These unique organelles are responsible for cellular digestion by providing substrates homeostasis parasite differentiation. Here we demonstrate that under nutritional lipid stress, preferentially mobilized reservosome stocks, instead bodies, leading to the consumption reservoirs production ergosterol. Starved acquired more LDL-NBD-cholesterol endocytosis distributed exogenous their...
In Laurencia dendroidea, halogenated secondary metabolites are primarily located in the vacuole named corps en cerise (CC). For chemical defence at surface level, these intracellularly mobilised through vesicle transport from CC to cell periphery for posterior exocytosis of chemicals. The structures involved this specific traffic as well cellular related positioning and anchoring within not known. Here, we aimed investigate role cytoskeletal elements both processes. Cellular molecular assays...
The new pyrrole-imidazole and pyrrole-guanidine alkaloids 4-debromooroidin (1), 4-debromougibohlin (2), 5-debromougibohlin (3), 5-bromopalau’amine (4), along with the known hymenidin (5) (+)-monobromoisophakellin (6), have been isolated from a Dictyonella sp. marine sponge, collected at Amazon River mouth. bromine-substitution pattern observed for compounds 1, 2 4 is unusual among bromopyrrole sponges. 20S proteasome inhibitory activities of 1–6 recorded, (4) being most active in this series.
We investigated the organelles involved in biosynthesis of fatty acid (FA) derivatives cortical cells Laurencia translucida (Rhodophyta) and effect these compounds as antifouling (AF) agents. A bluish autofluorescence (with emission at 500 nm) within L. was observed above thallus surface via laser scanning confocal microscopy (LSCM). hexanic extract (HE) from split into two isolated fractions called hydrocarbon (HC) lipid (LI), which were subjected to HPLC coupled a fluorescence detector,...