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Length correction for early-juvenile Brazilian herring Sardinella janeiro (Eigenmann, 1894) after preservation in formalin, ethanol and freezing Neotropical Ichthyology
Santos,Joaquim N. S.; Araújo,Francisco G.; Silva,Débora S..
This work aims to quantify the variation in total length and body mass for the early-juvenile Brazilian herring Sardinella janeiro and to determine total length and body mass correction equation to allow fresh measures to be calculated from preserved ones. Fishes were randomly assigned to one of five preservation methods (freezing at - 20º C, 2.5% and 5% formalin, 70% and 95% ethanol), and measured for total length (TL) and body mass (W) before preservation, and on days 5, 15, 30, and 60 after storage. Significant reductions in total length and body mass occurred during the first 5 days after preservation and continued to contract significantly at a lesser rate through 30 days in most methods. Exceptions were shown for body mass in freezing and 5%...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Shrinkage; Storage; Back-calculation; Initial length; Size conversion; Clupeidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100011
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Correction of the weight and length for juveniles Atherinella brasiliensis (Actinopterygii: Atherinopsidae) after fixation in formalin and preservation in ethanol Rev. Bras. Zool.
Melo,Marcelo T.; Saturnino,Cíntia; Santos,Joaquim N. S.; Vasconcellos,Ruan M.; Cruz-Filho,Antonio G.; Araújo,Francisco G..
The present study compared losses of weight and length in specimens of Atherinella brasiliensis (Quoy & Gaimard, 1825) after fixation in formalin 10% during ten days, and posterior preservation in ethanol 70% for 45 days, in two solvents: freshwater and marine water. Additionally, correction factors were proposed to calculate the correction for weight and length from preserved specimens. The specimens were weighted and measured after collection (fresh), and with 10, 20, 27, 34, 41 and 55 days of fixation plus preservation. The largest losses in weight occurred during the first 20 days (10.35 ± 0.31% - freshwater; 11.29 ± 0.44% - marine water), continuing with lesser intensity up to the 27th day in freshwater dilution, and up to the 34th day in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Back-calculation; Initial length; Shrinkage; Size conversion.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600009
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Phytotoxicity of leaf aqueous extract of Rapanea umbellata (Mart.) Mez (Primulaceae) on weeds - doi: 10.4025/actasciagron.v35i2.16166 Agronomy
Novaes, Paula; Universidad de Cadiz; Imatomi, Maristela; Universidade Federal de São Carlos; Miranda, Maria Agusta Ferraz Machado; Universidade Federal de São Carlos; Gualtieri, Sonia Cristina Juliano; Universidade Federal de São Carlos.
Allelopathic substances can be used to develop weed control alternatives based on natural products. The objective of this study was to compare the phytotoxic activity of aqueous leaf extracts of Rapanea umbellata with the toxicity of a synthetic herbicide on the germination and growth of weed species. The weeds species barnyard grass (Echinochloa crus-galli), wild poinsettia (Euphorbia heterophylla) and morning glory (Ipomoea grandifolia) were used. The effects of the aqueous leaf extract of R. umbellata at concentrations of 10% and 5% (g mL-1) were compared to the control (distilled water) and to the synthetic herbicide oxyfluorfen. The average weed germination time was significantly lower (p < 0.05) in control than in extract and herbicide...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agronomia; Botânica; Fisiologia vegetal; Alelopatia controle de espécies infestantes allelopathy; Germination; Growth; Initial length; Oxyfluorfen agronomia; Manejo e tratos culturais.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16166
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