Mercury (Hg) concentration in fish commercialized in the S ão Luís fish market (MA) and potential exposure of consumers
This study quantifies, for the first time, the Hg concentrations in nine most commercialized species in the São Luís (MA) fish market, where fish consumption is high, and estimates human exposure. Average Hg concentrations were highest in carnivorous species, yellow hake (Cynoscion acoupa) (0.296 mg kg-1), the Atlantic croaker (Micropogonias undulatus) (0.263 mg kg-1), whereas lowest concentrations were recorded in iliophagous Mullets (Mugil curema) (0.021 mg kg-1) and the Shorthead drum Larimus breviceps (0.025 mg kg-1). Significant correlations were observed between Hg concentrations and fish length in two species: the...
Source: An Acad Bras Cienc - April 17, 2024 Category: Science Authors: Luiz D Lacerda Victor L Moura Rayone Wesley S Oliveira Kevin Luiz C F Carmo Jorge Luiz S Nunes Arlan S Freitas Moises F Bezerra Source Type: research
Karyotypic changes and diversification time in Epinephelidae groupers (Perciformes). Implications on reproductive isolation
An Acad Bras Cienc. 2024 Apr 5;96(1):e20221011. doi: 10.1590/0001-3765202420221011. eCollection 2024.ABSTRACTGroupers (Epinephelidae and Serranidae) have attracted special attention to fish farming, and their species offer good opportunities for successful hybridizations. Cytogenetic data allow a better understanding of the role of karyotypic diversification in the acquisition of post-zygotic reproductive isolation (RI). Thus, chromosomal analyses were performed on E. striatus (Caribbean Sea), E. coioides and E. tauvina (Indo-Pacific Region), using standard procedures and mapping of six repetitive DNA classes by the in sit...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Karlla Danielle J Amorim Gide ão W W F Costa Cl óvis C Motta-Neto Rodrigo X Soares Amanda T Borges Daniel D Benetti Marcelo B Cioffi Luiz A C Bertollo Alongklod Tanomtong Wagner F Molina Source Type: research
Assessing the Time Evolution of COVID-19 Effective Reproduction Number in Brazil
An Acad Bras Cienc. 2024 Apr 5;96(1):e20221050. doi: 10.1590/0001-3765202420221050. eCollection 2024.ABSTRACTIn this paper, we use a Bayesian method to estimate the effective reproduction number ( R ( t ) ), in the context of monitoring the time evolution of the COVID-19 pandemic in Brazil at different geographic levels. The focus of this study is to investigate the similarities between the trends in the evolution of such indicators at different subnational levels with the trends observed nationally. The underlying question addressed is whether national surveillance of such variables is enough to provide a picture of the e...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Edson Porto DA Silva Antonio M N Lima Source Type: research
Redox profile of silver catfish challenged with Aeromonas hydrophila and treated with hexane extract of Hesperozygis ringens (Benth.) Epling through immersion bath
This study aimed to evaluate the effect of the HEHR, administered through single immersion bath, on lipid peroxidation and antioxidant defenses in muscle and liver tissue of silver catfish challenged with A. hydrophila. The results showed that the oxidative status of silver catfish was altered, although oxidative stress was not triggered during the experiment. HEHR at 30 mg/L (HEHR30) was not characterized as a pro-oxidant agent in the presence of infection, unlike florfenicol and HEHR at 15 mg/L treatments in some cases. In short, HEHR30 provided an important increase in hepatic catalase activity, characterizing one of th...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Isadora A Rosa Adriane E Bianchini Caroline A Bressan Fab íola T Ferrari Karine Ariotti Natacha C Mori Guerino Bandeira Junior Carlos G Pinheiro Maria Am ália Pavanato Juliana F Cargnelutti Bernardo Baldisserotto Berta Maria Heinzmann Source Type: research
Can species guilds act as hubs for energy transfer in macrophyte meadows of Amazonian floodplain lakes?
An Acad Bras Cienc. 2024 Apr 5;96(1):e20230327. doi: 10.1590/0001-3765202420230327. eCollection 2024.ABSTRACTAquatic macrophytes are the main autochthonous component of primary production in the Amazon Basin. Floating meadows of these plants support habitats with highly diverse animal communities. Fishes inhabiting these habitats have been assumed to use a broad range of food items and compose a particular food web. We employed carbon (δ13C) and nitrogen (δ15N) stable isotope analysis to draw the trophic structure of these habitats and to trace the energy flow by its trophic levels. Fishes and other animals from 18 indep...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Ana Cristina B Oliveira Carlos E C Freitas Marc Pouilly Kedma Cristine Yamamoto Lawrence Edward Hurd Pieter Dehart Jamerson A Santos Carlos Eduardo Rezende Marcelo G DE Almeida Flavia Kelly Siqueira-Souza Source Type: research
Antifungal chemosensitization through induction of oxidative stress: A model for control of candidiasis based on the Lippia origanoides essential oil
An Acad Bras Cienc. 2024 Apr 5;96(1):e20230532. doi: 10.1590/0001-3765202420230532. eCollection 2024.ABSTRACTIn this work, evaluated the antifungal chemosensitizing effect of the Lippia origanoides essential oil (EO) through the induction of oxidative stress. The EO was obtained by hydrodistillation and analyzed by GC-MS. To evaluate the antifungal chemosensitizing effect through induction of oxidative stress, cultures of the model yeast Saccharomyces cerevisiae ∆ycf1 were exposed to sub-inhibitory concentrations of the EO, and the expression of genes known, due be overexpressed in response to oxidative and mutagenic str...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Sandra Layse F Sarrazin Jean-Paul Bourdineaud Jos é Guilherme S Maia Rosa Helena V Mour ão Ricardo B Oliveira Source Type: research
Synthesis and mechanistic study of 2-(trifluoromethyl)-10H-phenoselenazine from double cross coupling reaction
An Acad Bras Cienc. 2024 Apr 5;96(1):e20230745. doi: 10.1590/0001-3765202420230745. eCollection 2024.ABSTRACTPhenoselenazines are nitrogen and selenium-based heterocyclic compounds that have important biological activities. However, their preparation methods are scarce and difficult to handle. The synthesis of a phenoselenazine from a simple and robust CuO nanoparticle catalyzed methodology, using bis-aniline-diselenide and 1,2-dihalobenzenes under microwave irradiation. Also, the double-cross-coupling reaction mechanism for C-Se and C-N bond formation, including the observation of a reaction intermediate by mass spectrome...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: C ássio Siqueira Gianluca Ciancaleoni Sumbal Saba Antonio L Braga Jamal Rafique Giancarlo V Botteselle Source Type: research
Reactive oxygen species impair Na+ transport and renal components of the renin-angiotensin-aldosterone system after paraquat poisoning
This study evaluated how ROS acutely influences Na+-transporting ATPases and the renal RAAS. Adult male Wistar rats received paraquat (20 mg/kg; ip). After 24 h, we observed body weight loss and elevation of urinary flow and serum creatinine. In the renal cortex, paraquat increased ROS levels, NADPH oxidase and (Na++K+)ATPase activities, angiotensin II-type 1 receptors, tumor necrosis factor-α (TNF-α), and interleukin-6. In the medulla, paraquat increased ROS levels and NADPH oxidase activity but inhibited (Na++K+)ATPase. Paraquat induced opposite effects on the ouabain-resistant Na+-ATPase in the cortex (decrease) and m...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Marry A S Cirilo Val éria B S Santos Nat ália K S Lima Humberto Muzi-Filho Ana D O Paix ão Adalberto Vieyra Leucio D Vieira Source Type: research
Evolution of the redox-altered, two-tiered Muralha Flow in the Fronteira Oeste Rift, southern Paran á Volcanic Province
An Acad Bras Cienc. 2024 Apr 5;96(1):e20231088. doi: 10.1590/0001-3765202420231088. eCollection 2024.ABSTRACTThe thorough redox alteration of a lava flow is an undescribed feature in intraplate basaltic provinces. The Early Cretaceous (134.5 Ma) Paraná Province displays that alteration in the major Muralha Flow. This oxidized and reduced flow from the southern part of the province was studied with satellite images, field surveying, petrography, and published whole rock geochemistry. The 100 x 100 km flow from the Cuesta de Haedo presents two hydrothermal tiers - lower Tier 1 is gray to white, upper Tier 2 is red. Iron oxy...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: L éo A Hartmann Leonardo Cardoso Renner Eduarda Klabunde Source Type: research
A preliminary study of cutaneous wound healing on the upper eyelid in a small Brazilian population using Rhizophora mangle-based cream
This study aimed to evaluate the effectiveness of the 5% Rhizophora mangle cream compared to the 5% dexpanthenol cream in healing open surgical wounds on the upper eyelid. A total of 18 patients were submitted to the experiment and divided into 2 groups with 9 patients each who used topically and daily 5% dexpanthenol cream (control group) or 5% R.mangle cream (intervention group) for 7 days. Clinical, morphometric and histomorphometric analyses of wounds and surgical procedures for skin removal were performed. In the morphometric analysis, all wounds treated with R.mangle and dexpanthenol creams showed complete macroscopi...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Jerrar J X Silva Leila B Leal J éssica G A Sá Larissa R A Sabino Isabelle M F S D Cavalcanti Luzia A Silva Eduarda S DE Santana Fernando Henrique P Fernandes Iranildo Jos é C Filho Wesley F M Brand ão Jeymesson Raphael C Vieira Source Type: research
Effect of seasonality and estuarine waters on the phytoplankton of the Guam á River (Belém, Amazon, Brazil)
This study aimed to analyze the application of the Phytoplankton Community Index-PCI and Functional Groups-FG in determining the water quality of the Guamá River (Pará, Amazônia, Brazil). Samplings occurred monthly for analyses of phytoplankton and physical and chemical parameters, for two years, at the station where water was collected for human supply consumption. Seasonality influenced electrical conductivity, total suspended solids, dissolved oxygen, transparency, winds, true color, and N-ammoniacal. The ebb tide showed high turbidity and suspended solids. The density varied seasonally with the highest values occurr...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Paola Vitoria B Pires Eliane B DE Sousa Aline L Gomes Celly Jenniffer S Cunha Vanessa B DA Costa Tavares Samara Cristina C Pinheiro Bruno S Carneiro Nuno Filipe A C DE Melo Source Type: research
Huanglian Decoction treats Henoch-Schonlein purpura nephritis by inhibiting NF- κB/NLRP3 signaling pathway and reducing renal IgA deposition
This study aimed to investigate the protective mechanism of HLD treatment in HSPN. The effects of HLD on HSPN biochemical indices, kidney injury and NF-κB/NLRP3 signaling pathway were analyzed by biochemical analysis, ELISA, HE and PAS staining, immunohistochemistry, immunofluorescence, and Western Blot. In addition, the effects of HLD on HSPN cells were analyzed. We found that HLD treatment significantly reduced renal tissue damage, decreased the levels of IL-17, IL-18, TNF-α, and IL-1β, and increased the levels of TP and ALB in HSPN mice. It also inhibited the deposition of IgA, IgG, and C3 in kidney tissues and signi...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Lian Hu Linlin Li Hong Che Bingjie Zhao L I Xiao Peijia Liu Wenjing Yi Songshan Liu Source Type: research
Hippocampal acetylcholinesterase activation induced by streptozotocin in mice is protected by an organotellurium compound without evidence of toxicity
This study aimed to evaluate if the tellurium-containing organocompound, 3j, 5'-arylchalcogeno-3-aminothymidine derivative, interferes with the effects of streptozotocin, as well as to investigate its toxicity in adult mice. Cognitive deficit was induced by two doses of streptozotocin (2.25 mg/kg/day, 48 h interval) intracerebroventricularly. After, the mice were subcutaneously treated with 3j (8.62 mg/kg/day) for 25 days. The effects were assessed by evaluating hippocampal and cortical acetylcholinesterase and behavioral tasks. 3j toxicity was investigated for 10 (0, 21.55, or 43.10 mg/kg/day) and 37 (0, 4.31, or 8.62 mg/...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Nilce C Peixoto Jamile S Bernardi Cl áudia S Oliveira Mariana Suelen C Santos Sara L Marion Rafael S Silva Raquel M Rosa Oscar E D Rodrigues Maria Ester Pereira Source Type: research
Green manure (Crotalaria juncea L.) enhances Origanum vulgare L. biomass accumulation, essential oil yield, and phytochemical properties
The objectives of this study were to evaluate the GM on biomass, essential oil (EO), phenolic and antioxidant. The experiment consisted: control; 150, 300, 450, and 600 g (Sh= leaves+steam) more 200 g roots (R); 600 g aerial part; 200 g roots; and soil with 300 g cattle manure per pot. The highest dry weights were observed in the presence of GM and cattle manure (90 days). The control had an EO production 75% lower in relation to the dose of 450 g GM (Sh+R). Principal component analysis showed that GM and cattle manure positively influenced the dry weight, content, yield, and EO constituents, and total flavonoids. The GM c...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Rafael M A DE Assis Jandeilson P Dos Santos Alan DA Cunha Honorato Jo ão Pedro M Rocha Alexandre A DE Carvalho Suzan Kelly V Bertolucci Jos é Eduardo B P Pinto Source Type: research
The effect of linseed oil/canola oil blend on the coating and thermal properties of waste PET-based alkyd resins
This study aims to prepare oil-modified alkyd resins using a linseed oil/canola oil (LO/CO) blend and waste PET depolymerization product, suitable for environmentally friendly coating applications. Waste PET flakes obtained from grinding post-consumer water bottles were depolymerized by the aminoglycolysis reaction at high pressure. Raw depolymerization product (DP) was used in the synthesis of four components, 50% oil alkyd resins by monoglyceride method. DP has partly replaced the dibasic acid component in the PET-based alkyd formulations. Besides PET-based alkyds, reference alkyds without DP were also synthesized for co...
Source: An Acad Bras Cienc - April 10, 2024 Category: Science Authors: Tu ğba Erol Demet H Özaltun Ferda Civan Çavuşoğlu I şil Acar Gamze G üçlü Source Type: research
