نتایج جستجو برای: loec

تعداد نتایج: 108  

Journal: :Aquatic toxicology 2010
N W Shappell K M Hyndman S E Bartell H L Schoenfuss

17β-Estradiol is the most potent natural estrogen commonly found in anthropogenically altered environments and has been the focus of many toxicological laboratory studies. However, fewer aquatic toxicological data on the effects of 17α-estradiol, a diastereoisomer of 17β-estradiol, exists in the literature even though it has been found in the aquatic environment, sometimes at higher concentrati...

Journal: :Revista de biologia tropical 2012
Freylan Mena Torres Sascha Pfennig María de Jesús Arias Andrés Gabriel Márquez-Couturier Adrían Sevilla C Maurizio Protti

Biomarkers are a widely applied approach in environmental studies. Analyses of cholinesterase (ChE), glutathione S-transferase (GST) and lipid peroxidation (LPO) are biomarkers that can provide information regarding early effects of pollutants at different biochemical levels on an organism. The aim of this study was to evaluate the biomarker approach on a Costa Rican native and relevant species...

2014
Josef Velisek Alzbeta Stara Dalibor Koutnik Jana Machova

The aim of the study was to investigate effects of the triazine's herbicide terbuthylazine-2-hydroxy on early life stage of common carp (Cyprinus carpio L.) through antioxidant indices, mortality, growth, development, and histopathology. Based on accumulated mortality in the experimental groups, lethal concentrations of terbuthylazine-2-hydroxy were estimated at 35-day LC50 = 10.9 mg/L terbuthy...

2014
Eva Praskova Lucie Plhalova Lucie Chromcova Stanislava Stepanova Iveta Bedanova Jana Blahova Martin Hostovsky Misa Skoric Petr Maršálek Eva Voslarova Zdenka Svobodova

The aim of this study was to investigate effects of subchronic exposure to sublethal levels of diclofenac on growth, oxidative stress, and histopathological changes in Danio rerio. The juvenile growth tests were performed on Danio rerio according to OECD method number 215. Fish at the age of 20 days were exposed to the diclofenac environmental concentration commonly detected in the Czech rivers...

Journal: :Limnetica 2023

El presente estudio tuvo como objetivo investigar los efectos de metales pesados Níquel (Ni), Zinc (Zn) y Cadmio (Cd) sobre diferentes parámetros morfométricos pigmentos la macrófita acuática Lemna gibba. Ni produjo una disminución del área ejes longitudinal transversal las frondes, a partir 0.37 mg/L 0.92 respectivamente. Zn en estos concentraciones exposición 4.6 mg/L. Cd, por su parte, ejerc...

2012
Stanislava Štěpánová Lucie Plhalová Petra Doleželová Miroslav Prokeš Petr Maršálek Miša Škorič Zdeňka Svobodová

The aim of this study was to assess the impact of terbuthylazine in surface waters on fish under experimental conditions. Subchronic toxic effects on embryos and larvae of common carp (Cyprinus carpio) were investigated during a 30-day toxicity test. The exposure to terbuthylazin showed no effect on mortality, but significant differences (P < 0.0001) were revealed on weight and growth parameter...

Journal: :Journal of toxicology and environmental health. Part A 2014
G Hariharan R Purvaja R Ramesh

Acute and chronic toxicity tests were conducted on green mussel (Perna viridis) to determine the adverse effects of lead (Pb). Exposure of organisms to acute toxicity test for 96 h and lethal concentration (LC(50)) was the endpoint of the test. Acute toxicity for 96-h LC(50) and 95% confidence intervals of P. viridis was 2.62 ± 0.12 (2.62-3.24) mg/L Pb. Chronic toxicity tests revealed that surv...

Journal: :Ecotoxicology and environmental safety 2008
Karel A C De Schamphelaere Joris M Koene Dagobert G Heijerick Colin R Janssen

The ecological risk assessment and the development of water-quality criteria for Co are currently still hampered by insufficient knowledge about the toxicity of Co to freshwater organisms. A relevant group of organisms, for which no toxicity data with Co are available, is the class of the herbivorous pulmonate freshwater snails, which fulfil a pivotal role in the consumption and decomposition o...

2000
P. Chenon A. Rousset Y. Crouau

Ecotoxicological tests are increasingly being used to evaluate the toxicity of a substance or mixture of substances towards soil fauna. One of these uses the parthenogenetic collembolan Folsomia candida to test for soil contamination, and this has been standardised in Europe. However, in such studies, it is important to know whether different laboratories use genetically close clones. In this s...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید