ABSTRACT: Spermatogonial stem cells (SSCs) are responsible for the production of spermatozoa throughout adulthood and recovery spermatogenesis following exposure to cytotoxic agents. Previously, we have shown that combined administration bleomycin, etoposide, cisplatin (BEP) used in treatment testicular cancer causes impaired reduced sperm rat. However, definitive evidence about potential impact such chemotherapy on SSCs is still lacking. The objective this study was determine whether...

To investigate possible morphological changes to the liver tissue of lambaris, Astyanax bimaculatus (Linnaeus, 1758), females were exposed treatments sublethal concentrations insecticide Thiodan(®) for 96 hr. Treatments included three 1.15, 2.3, and 5.6 μg L(-1) a control group without insecticide. The action at did not affect structure as whole, but in isolated locations hepatic parenchyma observed. Glycogen depletion, nuclear cytoplasmic deformation, hypertrophy, hyperemia, cellular...

This paper aims to establish possible changes in the main reproductive parameters of so-called piau-branco, Schizodon knerii, three sections São Francisco River basin. Fish (n = 388) were captured quarterly between May 2012 and April 2013 from (SFR): section 1 Três Marias Reservoir (TMR), a lentic environment; 2 SFR, first 34 km downstream TMR, lotic environment which temperature, oxygen levels, flow are not suitable for reproduction; 3 34–54 TMR after confluence with Abaeté River, levels...

Abstract: In order to assess the influence of Três Marias dam on reproduction white piranha, Serrasalmus brandtii, 1569 specimens captured from June 2011 May 2012 in three sections São Francisco River basin were analyzed: section 1 = reservoir (TMR); 2 (SFR) segment immediately downstream TMR; and 3 SFR at confluence with Abaeté River. Total length (TL), body weight (BW), gonadosomatic index (GSI), gonadal maturation stages determined for each specimen, while vitellogenic follicle diameter,...

Thiodan® is an insecticide which can cause morphological changes in fish tissues, dependent on the concentration. To investigate possible changes, this study evaluated number and diameter of ovarian follicles lambaris Astyanax bimaculatus exposed to for 96 h different treatments at three sub-lethal concentrations: 1.15, 2.3 5.6 μg L−1 a control group without Thiodan®. Females were divided into four treatments: (i) acclimation food, (ii) with (iii) 10 days food; (iv) food. In study, it was...

The Doce River basin is impacted by mining, dams, introduction of non-native species, andother human actions. Here we show an additional threat — the ingestion anthropogenic objects bythe freshwater fishes region. We collected 234 specimens at five sites across basin.We found that seventeen (7.3% total) fish species ingested debris(including those from fishing activities). Our findings need for new studies, especially to evaluatedrifting residues in main river channel. In addition, our...

The knowledge regarding labial salivary glands is becoming progressively more important, as their application in autologous transplantion, to promote ocular surface lubrication, are an ever-increasing procedure veterinary medicine. In this study the gland was collected, a single piece, along with oral mucosa from 10 adult dog cadavers. sample removed left lower lip marked by second premolar tooth and extended until distal edge of molar. Morphological, morphometric histochemical evalutations...

Abstract In this study, we determined the main reproductive parameters of piau gordura, Leporinus piau, in two sections São Francisco River basin. Between May 2015 and April 2016, a total 573 specimens were captured from lentic environment (section 1), Três Marias Reservoir (TMR), lotic 2), downstream TMR at confluence (SFR) with Abaeté River. Analysis activity showed that L. both reproduced, but females males section 1 exhibited higher length, body weight, Fulton condition factor,...

O Thiodan(r) é um organoclorado a base de endosulfan que pode causar alterações morfológicas nos tecidos peixes, dependendo da concentração e tempo exposição. Este estudo teve como objetivo determinar CL50-96h do (endosulfan 350g L-1) para fêmeas lambaris Astyanax bimaculatus em período reprodução analisar morfologia desenvolvimento folicular diferentes concentrações agrotóxico. Foram feitos quatro experimentos: 1) sem aclimatação alimentação; 2) alimentados; 3) com 10 dias 4) alimentados. A...

<div class="section abstract"><div class="htmlview paragraph">This study aims to present a virtual numerical validation procedure for durability in brake system components, using artificial neural networks and based on experimental bench tests. The focus was concentrated the drum spider component, responsible mechanically connecting subassemblies. To develop procedure, engineering software such as ABAQUS, Fe-Safe, Minitab, MATLAB used. These were crucial carrying out stress...

<div class="section abstract"><div class="htmlview paragraph">The demand for enhanced safety and extended lifespan of brake systems prompts the investigation to increase static mechanical properties fatigue resistance commercial vehicle spiders through incorporation niobium nanoparticles into a cast iron alloy. This study aims improve material structure as well dynamic component. Chemical, microscopic, analyses were conducted in samples nanostructured alloy spider. A durability...

Five females and five males of Megaleporinus elongatus captured in the Jequitinhonha River were transferred to hypophysation tanks with a constant water flow at 26°C Machado Mineiro Fish Farm. They submitted induced reproduction by method. Crude carp pituitary extract (Cyprinus carpio) was injected into coelomic cavity two doses (2.5 5.0 mg/kg) for 3 (2.5, 5.0, 2.5 females. The applied 24-hr interval between 1st 2nd 12-hr 3rd ones. Oocytes semen obtained manual extrusion, dry method used...

Abstract Hoplias intermedius , of the Characiformes order and Erytrinidae family, is widely distributed across South America. This commercially interesting species can reach a length 100 cm weight 15–20 kg. To evaluate reproductive biology H. in São Francisco River, Brazil, 154 males 190 females were captured bi‐monthly between September 2018 August 2019 from downstream regions Três Marias dam. Gillnets with differently sized meshes deployed at distances 34–54 km after confluence Abaeté...

Bovine cysticercosis is a zoonosis that affects humans in their adult form (taeniasis) and its larval found inserted the musculature of infected cattle (cysticerci). It still not entirely clear how animal immune response against infection occurs, being comprehension this process necessary for enhancement diagnostic capacity disease prevention. This work aimed to evaluate evolution experimentally cattle, compared with findings cell by optical microscopy. Nine animals were at rate 120,000 eggs...

ABSTRACT: Lambari, Astyanax bimaculatus, is an oviparous, multiple-spawning fish that reproductively active throughout the year, which makes it promising for cultivation and research. This research histologically evaluates ovaries of lambari have undergone artificial spawning induced with pituitary extract (control group), effect growth hormone at a dose 2 mg/g body weight (treatment group) on subsequent process ovarian recovery. Ovaries in both control treatments groups were collected 120...