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Registros recuperados: 9
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Age-dependent fecundity of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) with sublethal doses of gammacyhalothrin BABT
Pereira,Alexandre Igor Azevedo; Ramalho,Francisco de Sousa; Bandeira,Catarina de Medeiros; Malaquias,José Bruno; Zanuncio,José Cola.
Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) was exposed to gammacyhalothrin to study the stimulatory effect of low concentrations of this pyrethroid. The doses studied were 23.4375, 11.7188, 5.8594, 2.9297, 1.4648, 0.7324 mg.litre-1 and water, as control. The third, fourth, and fifth instars of P. nigrispinus were shorter with all the doses of this insecticide. The survival and longevity of this predator was highest with the lowest doses. The oviposition period of P. nigrispinus decreased as the doses increased. The lowest pre-and postoviposition periods were found with 11.7188 mg.litre-1 of gammacyhalothrin. The dose 0.7324 mg.litre-1 increased the clutch interval. The egg viability was similar between the treatments. The number of eggs per...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Predator; Pyrethroid; Stink bug; Hormesis; Biology.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500013
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Caffeic acid improves cell viability and protects against DNA damage: involvement of reactive oxygen species and extracellular signal-regulated kinase BJMBR
Li,Y.; Chen,L.J.; Jiang,F.; Yang,Y.; Wang,X.X.; Zhang,Z.; Li,Z.; Li,L..
Hormesis is an adaptive response to a variety of oxidative stresses that renders cells resistant to harmful doses of stressing agents. Caffeic acid (CaA) is an important antioxidant that has protective effects against DNA damage caused by reactive oxygen species (ROS). However, whether CaA-induced protection is a hormetic effect remains unknown, as is the molecular mechanism that is involved. We found that a low concentration (10 μM) of CaA increased human liver L-02 cell viability, attenuated hydrogen peroxide (H2O2)-mediated decreases in cell viability, and decreased the extent of H2O2-induced DNA double-strand breaks (DSBs). In L-02 cells exposed to H2O2, CaA treatment reduced ROS levels, which might have played a protective role. CaA also activated the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caffeic acid; Hormesis; Antioxidants; DNA double-strand breaks; Extracellular signal-regulated kinase.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000600502
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Complex Relationships between the Blue Pigment Marennine and Marine Bacteria of the Genus Vibrio ArchiMer
Falaise, Charlotte; James, Adele; Travers, Marie-agnes; Zanella, Marie; Badawi, Myriam; Mouget, Jean-luc.
Marennine, the water-soluble blue pigment produced by the marine diatom Haslea ostrearia, is known to display antibacterial activities. Previous studies have demonstrated a prophylactic effect of marennine on bivalve larvae challenged with a pathogenic Vibrio splendidus, suggesting that the blue Haslea is a good candidate for applications in aquaculture as a source of a natural antimicrobial agent. Indeed, the genus Vibrio is ubiquitous in aquaculture ecosystems, and regular events of pathogenic invasion cause some of the biggest losses worldwide. To better characterize the effects of marennine on Vibrios, a panel of 30 Vibrio strains belonging to 10 different species was tested, including bivalve pathogenic species (e.g., Vibrio crassostreae and Vibrio...
Tipo: Text Palavras-chave: Antibacterial activity; Diauxie; Haslea; Hormesis; Marennine; Vibrio.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00484/59598/62602.pdf
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Crescimento inicial de plantas de pequi após aplicação de 2,4-D PFB - Pesquisa Florestal Brasileira
Tavares, Cássio Jardim; Pereira, Leandro Spíndola; Araújo, Alana Cristina Ferreira; Martins, Deborah Amorim; Jakelaitis, Adriano.
O ácido 2,4-diclorafenóxacético (2,4-D) tem causado efeitos tóxicos em várias culturas cultivadas vizinhas ao local na qual foi destinado, devido à deriva durante sua aplicação. Objetivou-se, nesta pesquisa, avaliar o efeito da deriva simulada por meio de subdoses do herbicida 2,4-D em plantas de pequi (Caryocar brasiliense, Camb.). Testaram-se em blocos completos casualizados com seis repetições as doses de 0; 1,67; 3,35; 6,70; 16,75; 33,50; 67,00 e 134,00 g ha-1 de equivalente ácido do herbicida. A unidade experimental foi de um vaso contendo uma planta de pequi. A aplicação de 2,4-D causou sintomas leves de epinastia nas folhas, com valores entre 6,25 e 13,33% de fitointoxicação nas plantas de pequi; contudo, ocorreu a recuperação das plantas a partir...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recursos florestais; Fisiologia e tratos culturais; Herbologia Fitotoxicidadel; Herbicidas; Hormese Phytotoxicity; Herbicide; Hormesis.
Ano: 2017 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1280
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Effect of Trinexapac-Ethyl, at Two Application Timings, on the Initial Development of Eucalyptus under Water Deficit Planta Daninha
BACHA,A.L.; MARTINS,P.F.R.B.; ALVES,P.L.C.A.; PAULA,R.C..
ABSTRACT: Eucalyptus plants are sensitive to stress during their initial development, and water deficit is the most important one. Thus, the hormetic effect caused by the application of chemical products may be a factor that allows plants to tolerate such stresses. The objective of this study was to evaluate the effects of trinexapac-ethyl on the initial growth of Eucalyptus urophylla (Clone I-144), under water deficiency, at two application timings (before planting - BP; and after planting - AP). Two experiments were conducted simultaneously in a greenhouse for 74 days after planting (DAP) eucalyptus in 15 L pots. Treatments consisted of three trinexapac-ethyl doses (0.0, 30, and 60 g a.i. ha-1) and two water conditions (with and without water deficit). A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eucalyptus urophylla; Hormesis; Subdose; Abiotic stress.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100203
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Effects of 2,4-D Herbicide on Species of the Digitaria Genus Planta Daninha
GAZOLA,T.; DIAS,M.F.; DIAS,R.C.; CARBONARI,C.A.; VELINI,E.D..
ABSTRACT: The objective of this work was to evaluate the effects of the 2,4-D herbicide on the growth and development of Digitaria insularis and Digitaria horizontalis plants under different climatic conditions. Two greenhouse experiments were conducted in a completely randomized design, with 11 treatments (rates of the herbicide) and four replications. Rate-response curves were determined for the 2,4-D rates of 0, 50.37, 100.75, 201.5, 403, 806, 1,612, 3,224, 6,448, 12,896, and 25,792 g a.i. ha-1. The plants presented growth stimulus with low rates of 2,4-D in the autumn-winter period, but this stimulus was not found in the spring-summer period. The plants subjected to application of high rates of 2,4-D had significantly lower growth and development than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Synthetic auxin; Digitaria insularis; Digitaria horizontalis; Hormesis.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100173
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Exploring the Herbicidal and Hormetic Potential of Allelopathic Crops Against Fenoxaprop-Resistant Phalaris minor Planta Daninha
ABBAS,T.; NADEEM,M.A.; TANVEER,A.; ALI,H.H.; SAFDAR,M.E.; ZOHAIB,A.; FAROOQ,N..
ABSTRACT: Recent increases in the development of herbicide resistance in Phalaris minor worldwide demand alternative non-chemical strategies to control this weed. A series of experiments were conducted under laboratory and greenhouse conditions to explore the herbicidal potential of four allelopathic crops, including maize, rice, sorghum and sunflower, at different concentrations of aqueous extracts (2.5% and 5%), residues (1%, 2% and 4%) and mulches (4, 8, and 12 ton ha-1) against fenoxaprop-resistant P. minor. Aqueous extracts, residues and mulches provided 86-100%, 73-100% and 16-40% control of this resistant weed biotype, respectively. The dry biomass reduction due to aqueous extracts, residues and mulches was 48-100%, 48-100% and 20-54%, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allelopathy; Alternative weed management; Hormesis; Littleseed canarygrass; Natural herbicides.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100257
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Hormesis response of marine and freshwater luminescent bacteria to metal exposure Biol. Res.
SHEN,KAILI; SHEN,CHAOFENG; LU,YUAN; TANG,XIANJIN; ZHANG,CONGKAI; CHEN,XINCAI; SHI,JIYAN; LIN,QI; CHEN,YINGXU.
The stimulatory effect of low concentrations of toxic chemicals on organismal metabolism, referred to as hormesis, has been found to be common in the widely used luminescence bioassay. This paper aims to study the hormesis phenomenon in both marine and freshwater luminescent bacteria, named Photobacterium phosphorem and Vibrio qinghaiensis. The effects of Cu (II), Zn (II), Cd (II) and Cr (VI) on luminescence of these two bacteria were studied for 0 to 75 minutes exposure by establishing dose- and time-response curves. A clear hormesis phenomenon was observed in all four testing metals at low concentrations under the condition of luminescence assays.
Tipo: Journal article Palavras-chave: Hormesis; Bioluminescence; Q67; T3.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200006
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Morphoanatomical injuries in Pistia stratiotes L. (Araceae) as a result of exposure to clomazone in water Anais da ABC (AABC)
RIBEIRO,VICTOR HUGO VIDAL; COUTINHO,ÍTALO ANTÔNIO COTTA; ALENCAR,BRENDA THAIS BARBALHO; CABRAL,CÁSSIA MICHELLE; SANTOS,JOSÉ BARBOSA DOS; FERREIRA,EVANDER ALVES; FRANCINO,DAYANA MARIA TEODORO.
Abstract Contamination of water sources due to herbicide is of great concern. Clomazone is a pesticide with a high contamination potential which could possibility lixiviate to water streams. Changes caused by residual herbicide include flora modifications which are generally detrimental for some species. The lack of morphological studies performed in aquatic plants exposed to herbicide-contaminated environments has encouraged the development of our research. For the first time, we present a study that aimed to evaluate leaf injuries visible to the naked eye as well as microscopical effects which may be caused by clomazone on Pistia stratiotes. Pistia stratiotes was subjected to five concentrations of clomazone. Our analysis showed leaf injuries,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic macrophyte; Clomazone; Herbicide; Hormesis; Leaf anatomy; Water lettuce.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201003
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