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Iron is an essential micronutrient for brain development, participating in mitochondrial respiration, myelination, and neurotransmitter synthesis. However, previous studies have demonstrated that excessive iron during early postnatal life induces oxidative reactions, leading to mitochondrial dysfunction and synaptic failure. These alterations compromise energy metabolism and neuronal integrity, contributing to long-lasting cog...
Aim We evaluated how native vegetation cover influences the diversity of arachnid assemblages across multiple spatial scales in major Brazilian ecosystems. Location Brazil (Amazon and Atlantic rainforests, Cerrado savanna and Caatinga dry forest). Taxon Arachnida (Opiliones, Pseudoscorpiones and Scorpiones). Methods We sampled arachnids at 120 sites using active search and litter sifting. Native vegetation cover was quantified...
Unravelling the skin of the nurse shark: A morphological description of the placoid scales of Ginglymostoma cirratumNARA Subscribed
Ginglymostoma cirratum , commonly known as the nurse shark, is a nocturnally active benthic shark, often found in western and eastern Atlantic waters. Although this shark has been well explored in many biological aspects, few studies have thoroughly examined the morphology of its dermal denticles (or placoid scales). The dermal denticles are teeth‐like structures present in the skin of sharks and play an important role in the...
Aim To investigate the lineages diversification of Dolichothele exilis in the Caatinga biome and to infer geological and climatic drivers of diversification in this region. Location Caatinga, Northeast of Brazil. Taxon Dolichothele exilis (Araneae: Theraphosidae). Methods We used 96 individuals for genomic sequencing (GBS sequencing) and 39 individuals for COI mitochondrial marker sequencing. Population structure was inferred...
Understanding how internal mechanisms, social dynamics, and environmental factors interact to influence foraging behaviour is essential to unravel the complexity of decision-making in social insects. Despite extensive research on foraging behaviour in social insects, the mechanisms driving solitary foraging, particularly in Neotropical species, remain largely unexplored. This laboratory study evaluated how experience, colony s...
Micro‐Refuges or Ecological Traps: Context‐Dependent Effects of Rock Pools on Intertidal Biodiversity Across LatitudesNARA Subscribed
Aim We investigated how local‐scale environmental heterogeneity influences biodiversity patterns across broad biogeographic gradients, using intertidal microhabitats as a model system within one of the most environmentally stressful ecosystems on Earth. Location Intertidal habitats at 26 locations (two rocky shore sites per location) across six continents, spanning 98° of latitude (38°S to 60°N). Time Period 2019–2022. Major T...
The cDNA sequences of the common gonadotrophic hormone α-subunit (ag-Gthα) and of the specific follicle-stimulating hormone β-subunit (ag-Fshβ) of the giant Amazonian fish Arapaima gigas have been previously isolated by our research group. A synthesis of ag-Fsh in HEK293 cells and its purification and preliminary characterization were also carried out. In the present work, ag-Fsh was obtained and purified from the same host ce...