11 documents found, page 1 of 2
Survival and swimming behavior of insecticide-exposed larvae and pupae of the y...
Tomé, Hudson V. V.; Pascini, Tales V.; Dângelo, Rômulo A. C.; Guedes, Raul N. C.; Martins, Gustavo F.The yellow fever mosquito Aedes aegypti is essentially a container-inhabiting species that is closely associated with urban areas. This species is a vector of human pathogens, including dengue and yellow fever viruses, and its control is of paramount importance for disease prevention. Insecticide use against mosquito juvenile stages (i.e. larvae and pupae) is growing in importance, particularly due to the ever-...
Age-mediated and environmentally mediated brain and behavior plasticity in the ...
Tomé, Hudson Vaner V.; Rosi-Denadai, Conrado A.; Pimenta, Jessica Fernanda N.; Guedes, Raul Narciso C.; Martins, Gustavo F.Structural changes in the insect brain related to age and individual experience may underlie the behavioral plasticity that is particularly important in such social insects as bees. This study assessed the influence of age and rearing conditions (field vs laboratory) in mediating changes in the volume of mushroom bodies and antennal lobes in the brains of workers of the native stingless bee Melipona quadrifasci...
Digestive and regenerative cells in the midgut of haploid and diploid males of ...
Fernandes, Kenner M.; Martins, Gustavo F.; Serrão, José E.; Neves, Clóvis A.In eusocial bees, workers and queens are diploid (2n), whereas males are haploid (n). However, in some species, including the stingless bee Melipona quadrifasciata anthidioides Lepeletier, 1836, 2n males arise from fertilized eggs resulting from the crossing between a queen and her brother. In the present study, we provide a comparative analysis of the digestive and regenerative cells in n and 2n pupae and adul...
Morphology and morphometry of the Midgut in the Stingless Bee Friesella schrott...
Oliveira, André H.; Gonçalves, Wagner G.; Fernandes, Kenner M.; Barcellos, Marcelo S.; Sampaio, Wagner M. S.; Lopes, Marcos P.; Martins, Gustavo F.Friesella schrottkyi is a small stingless bee (3-mm long) important for agricultural and native forest pollination. This study describes the morphology and morphometry of the midgut in F. schrottkyi forager workers. The F. schrottkyi midgut presents a single-layered epithelium with digestive, regenerative and endocrine cells. The digestive cells are similar along the entire midgut length with a spherical nucleu...
Spinosad in the native stingless bee Melipona quadrifasciata: regrettable non-t...
Martins, Gustavo F.; Tomé, Hudson Vaner V.; Barbosa, Wagner F.; Guedes, Raul Narciso C.The risks imposed by novel insecticides, mainly bioinsecticides, are largely unknown despite their increased use and their perceived environmental safety, which is based on their natural origin. Furthermore, unlike honeybees, native pollinator species have received little attention. In the present study, the lethal and sublethal effects of the neonicotinoid imidacloprid and the bioinsecticide spinosad were asse...
The ultrastructure of the Aedes aegypti heart
Leódido, Ana Carolina M.; Martins, Gustavo F.; Ortigão, Marcelo RamalhoComparative structural analyses of the heart and associated tissues in 4th instar larvae (L4), pupae and adults of Aedes aegypti were undertaken using a combination of microscopy techniques. The Ae. aegypti heart consists of cardiomyocytes arranged in a helical fashion, and it is physically associated with intersegmental groups of pericardial cells (PCs) and the alary muscles (AMs). Ramifications commonly prese...
Alternative control of Aedes aegypti resistant to pyrethroids: lethal and suble...
Silva, Indira M. A.; Martins, Gustavo F.; Melo, Carlisson R.; Santana, Alisson S.; Faro, Ruan R. N.; Blank, Arie F.; Alves, Péricles B.The mosquito Aedes aegypti is intensely controlled because it is vector of viruses that cause innumerous diseases, especially in tropical regions. Due to the indiscriminate use of insecticides, populations from different regions have been resistant to pyrethroids. Here, we analyzed the lethal and sublethal effects of essential oil of Aristolochia trilobata and its major compounds on A. aegypti from susceptible ...
Termiticidal lectins from Myracrodruon urundeuva (Anacardiaceae) cause midgut d...
Lima, Thâmarah A.; Fernandes, Kenner M.; Oliveira, Ana Patrícia S.; Dornelles, Leonardo P.; Martins, Gustavo F.; Napoleão, Thiago H.Myracrodruon urundeuva is a hardwood tree, and its bark, heartwood and leaf contain lectins (MuBL, MuHL and MuLL respectively) with termiticidal activity against Nasutitermes corniger. In this work, the effects of these lectins on the midgut of N. corniger workers were evaluated. The insects were supplied with an artificial diet containing the lectins at their respective LC 50 (previously determined). At 48 h a...
The insect spermatheca: an overview
Pascini, Tales V.; Martins, Gustavo F.In the female insect, the spermatheca is an ectodermal organ responsible for receiving, maintaining, and releasing sperm to fertilize eggs. The number and morphology of spermathecae vary according to species. Within the spermathecal lumen, substances in the semen and secretions from the spermathecal gland nourish the sperm. Thus, the spermatheca provides an appropriate environment that ensures the long-term via...
Detection of a new pyrethroid resistance mutation (V410L) in the sodium channel...
Martins, Gustavo F.; Haddi, Khalid; Tomé, Hudson V. V.; Du, Yuzhe; Valbon, Wilson R.; Nomura, Yoshiko; Dong, Ke; Oliveira, Eugênio E.The yellow fever mosquito, Aedes aegypti, particularly in Neotropical regions, is the principal vector of dengue, yellow fever, Zika and Chikungunya viruses. Pyrethroids remain one of the most used insecticides to control Aedes mosquitoes, despite the development of pyrethroid resistance in many mosquito populations worldwide. Here, we report a Brazilian strain of A. aegypti with high levels (approximately 100–...