A5087918015- Marine and coastal plant biology
- Algal biology and biofuel production
- Biocrusts and Microbial Ecology
- Seaweed-derived Bioactive Compounds
- Polar Research and Ecology
- Marine Biology and Ecology Research
- Light effects on plants
- Plant Stress Responses and Tolerance
- Fungal Biology and Applications
- Physiological and biochemical adaptations
- Polyamine Metabolism and Applications
- Ocean Acidification Effects and Responses
- Botanical Research and Applications
- Magnetic and Electromagnetic Effects
- Microbial Metabolism and Applications
- Heavy metals in environment
- Paleontology and Stratigraphy of Fossils
- Microbial Community Ecology and Physiology
- Microbial Natural Products and Biosynthesis
- Oil Spill Detection and Mitigation
- Echinoderm biology and ecology
- Geochemistry and Elemental Analysis
- Microbial bioremediation and biosurfactants
- Lichen and fungal ecology
- Marine and coastal ecosystems
Universidade Federal de Santa Catarina
2014-2025
The effect of lead and copper on apical segments Gracilaria domingensis was examined. Over a period 7 days, the were cultivated with concentrations 5 10 ppm under laboratory conditions. samples processed for light, confocal, electron microscopy, as well histochemistry, to evaluate growth rates, mitochondrial activity, protein levels, chlorophyll a, phycobiliproteins, carotenoids. After days exposure copper, rates slower than control, biomass loss observed copper-treated plants....
Ultraviolet radiation (UVR) interferes with aspects of life on Earth. It is necessary for the synthesis important molecules, as vitamin D, but it harmful to organisms leading photoaging and skin cancer. Artificial sunscreens prevent these effects, may be carcinogenic neurotoxic; also they accumulate in aquatic ecosystem, harming environment coral bleaching. Most artificial commercialized are fossil fuel derived produced by petrochemical industry. As society turns bioeconomy, substituted...
The photoacclimation responses of the brown macroalga Sargassum cymosum were studied to determine its cytochemical and ultrastructural organization, as well photosynthetic pigments performance. S. was cultivated in three salinities (30, 35 40 psu) under four irradiation treatments: PAR-only, PAR + UVA, UVB UVA UVB. Plants exposed at 70 μmol photons m(-2) s(-1), 0.35 W +UVA 0.70 for 3 h per day during 7 days vitro. Growth rate not significantly affected by any type radiation or salinity....
This study investigated the effects of radiation (PAR+UVA+UVB) on development and growth rates (GRs) young gametophytes Gelidium floridanum. In addition, photosynthetic pigments were quantified, carotenoids identified, performance assessed. Over a period 3 days, cultivated under laboratory conditions exposed to photosynthetically active (PAR) at 80 μmol photons m(-2) s(-1) PAR+UVA (0.70 W m(-2))+UVB (0.35 m(-2)) for h per day. The samples processed light electron microscopy analyze...
Abstract Polar environments pose extreme challenges for life due to low temperatures, limited water, high radiation, and frozen landscapes. Despite these harsh conditions, numerous macro microorganisms have developed adaptive strategies reduce the detrimental effects of cold. A primary survival tactic involves avoiding or tolerating intra extracellular freezing. Many organisms achieve this by maintaining a supercooled state producing small organic compounds like sugars, glycerol, amino...
Abstract The in vitro effect of cadmium (Cd) on apical segments Pterocladiella capillacea was examined. Over a period 7 days, the were cultivated with combination different salinities (25, 35, and 45 practical salinity units) Cd concentrations, ranging from 0.17 to 0.70 ppm. effects growth rates content photosynthetic pigments analyzed. In addition, metabolic profiling performed, samples processed for microscopy. Serious damage physiological performance ultrastructure observed under...
The effect of ultraviolet (UV) radiation and copper (Cu) on apical segments Pterocladiella capillacea was examined under two different conditions radiation, PAR (control) PAR+UVA+UVB (PAR+UVAB), three concentrations, ranging from 0 to 0.62, 1.25 2.50 μm. Algae were exposed in vitro photosynthetically active (PAR) at 70 μmol photons m(-2) s(-1) , + UVB 0.35 W +UVA 0.70 during a 12-h photocycle for 3 h each day 7 days. effects growth rates, content photosynthetic pigments performance analyzed....
Gelidium floridanum W.R. Taylor tetraspores are units of dispersal and responsible for substrate attachment. This study aimed to examine evidence direct interaction between germ tube formation Golgi activity during tetraspore germination G. floridanum. After release, the were incubated with brefeldin A (BFA) in concentrations 4 8 μM over a 6 h period. The controls treatments analyzed light, fluorescence (FM4-64 dye) transmission electron microscopy. In control samples, bodies formation....
Ocean warming is increasing and scientific predictions suggest a rise of up to 4°C in sea water temperatures. The combination polluted warmer environment may be detrimental for aquatic species, especially primary producers such as seaweeds. This study investigated the potential interactive effects an increased seawater temperature copper‐rich on photosynthetic pigments metabolic compounds red seaweed Gelidium floridanum . Seaweed samples were cultivated factorial design with (24°C 30°C),...
Presence of toxic compounds in marine coastal waters has increased exponentially since Industrial Revolution. In this way, we aimed to evaluate biochemical and physiological changes occurring within Hypnea musciformis after short-term exposure gasoline. was cultivated without gasoline then exposed various concentrations it (0.001 % - 1.0 %, v/v) for periods 30 min, 1 h, 12 h 24 h. A Pricncipal Compound Analysis UV-vis spectral window (200-700 nm) able discriminate gasoline-exposed samples...
Spore settlement and development are bottlenecks for resilience of habitat‐forming macroalgal species. These processes directly related to temperature, a global stressor protagonist ocean warming. The toxic effects local pollutants such as copper may be worsened under warming scenario. Therefore, in this paper, we investigated the increased temperature combined with elevated concentrations on viability, photosynthetic pigments, ultrastructure Gelidium floridanum tetraspores. Tetraspores were...
Antarctic active volcanoes can disperse pyroclastic minerals at long distances, transporting nutrients and microorganisms to the surrounding glacial environment. The sedimented volcanic materials - called tephras may interact with glacier ice produce a unique environment for microbial life. This study aimed describe community structure of an tephra layers in terms its taxonomic functional diversity. Ice samples from Collins Glacier (King George Island) containing Deception Island volcano...