Publications by authors named "Gustavo Henrique Pereira Goncalves"
Exposure to pesticides used in rice farming (bentazone, chlorantraniliprole and tebuconazole) affects biochemical biomarkers and hepatic histopathological parameters of hammertoad tadpoles (Boana faber).
Comp Biochem Physiol C Toxicol Pharmacol
September 2024
Article Synopsis
- Pesticides from rice farming can harm non-target organisms, impacting biodiversity, leading researchers to study their presence in river water and their effects on Boana faber tadpoles.
- The study found no major developmental issues in tadpoles but noted increased malondialdehyde (MDA) levels indicating oxidative stress after pesticide exposure, particularly with herbicide BTZ and fungicide TBZ.
- Histological examinations revealed significant changes in the tadpoles, such as inflammation and liver enzyme activity alterations, highlighting the negative impact of rice pesticides on local aquatic ecosystems and biodiversity.
Diversity of gastrointestinal parasites and molecular characterization of Giardia duodenalis in free-living and captive howler monkeys (Alouatta guariba clamitans) in southern Brazil.
Vet Parasitol Reg Stud Reports
July 2024
Article Synopsis
- Non-human primates, particularly southern brown howler monkeys in Brazil and Argentina, share a close relationship with humans, making them important for studying infectious agents.
- A study collected and analyzed stool samples from free-living and captive howler monkeys, revealing intestinal parasites like Giardia duodenalis and Cryptosporidium spp. for the first time in this species in the wild.
- The presence of these parasites, especially one that can be transmitted to humans, highlights the impact of human activities and habitat fragmentation on wildlife health and underscores the need for eco-health measures.
Tebuconazole (TBZ) and azoxystrobin (AZX) are fungicides frequently used in rice cultivation. Despite protecting crops against fungal diseases, these compounds can contaminate the natural environments close to the crops, exerting negative effects on non-target organisms, the present study aimed to characterize the contamination by fungicides of a river that flows in an area dominated by rice cultivation in the north of the state of Santa Catarina, SC, Brazil. Concentrations of TBZ and AZX found in the field were used to evaluate their negative effects on development, biochemical biomarkers and histopatology of the liver of a native tadpole species, the hammerfrog (Boana faber).
View Article and Find Full Text PDFIntroduction: Zoonotic transmission is a challenge for the control and elimination of malaria. It has been recorded in the Atlantic Forest, outside the Amazon which is the endemic region in Brazil. However, only very few studies have assessed the antibody response, especially of IgM antibodies, in Neotropical primates (NP).
View Article and Find Full Text PDFArticle Synopsis
- The study focuses on Plasmodium simium, a malaria-causing parasite in Brazilian non-human primates (NHP), which poses a risk for human infections and challenges malaria elimination efforts.* -
- Researchers analyzed blood samples from 35 NHP using quantitative PCR to measure specific parasite transcript levels, finding that 87.5% of samples confirmed P. simium infection with various rates of gametocyte presence.* -
- This research establishes a molecular understanding of P. simium in NHP, highlighting low gametocyte counts in most carriers and the potential implications for malaria transmission dynamics.*
Plasmodium infection and its association with biochemical and haematological parameters in free-living Alouatta guariba clamitans (Cabrera, 1940) (Primates: Atelidae) in Southern Brazil.
Mem Inst Oswaldo Cruz
March 2020
Article Synopsis
- The study investigates the infection rates of Plasmodium spp. in Southern brown howler monkeys in Brazil, aiming to link infection with various health parameters.
- A high infection positivity rate of 70% was found among captured monkeys, but no clinical or morphometric differences were noted between infected and uninfected individuals.
- The only significant finding was elevated alanine aminotransferase (ALT) levels in infected monkeys, indicating potential liver issues and highlighting the need for ongoing monitoring of malaria for wildlife conservation efforts.
Background: Physiological values reflect the health condition and responses of individuals to handling in captivity. The aim of this study was to establish hematological and serum biochemistry parameters of clinically healthy animals of the Alouatta guariba clamitans subspecies.
Methods: We collected blood samples from adult males and females kept at the Center for Biological Research of Indaial after chemical containment with 3.