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Tian,Hongtao; Tan,Jianxin; Zhang,Lifang; Gu,Xinxi; Xu,Wentao; Guo,Xinghua; Luo,Yunbo. |
The effects of the expression of a small heat shock protein (shsp) gene from Streptococcus thermophilus on stress resistance in Lactococcus lactis under different environmental stresses were investigated in this study. pMG36e-shsp, an expression vector, was first constructed by inserting a shsp open reading frame (ORF) cloned from S. thermophilus strain St-QC into pMG36e. Then, a food-grade expression vector, pMG-shsp, was generated by deleting the erythromycin resistance gene from pMG36e-shsp. The transformation rate of pMG-shsp was comparable to that of pMG36e-shsp when each of these two vectors was introduced into L. lactis. These results demonstrated that the shsp ORF could successfully used as a food-grade selection marker in both pMG-shsp and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Shsp gene; Streptococcus thermophilus; Lactococcus lactis; Food-grade vector; Stress resistance. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000300043 |
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Luz,Ronald Kennedy; Portella,Maria Célia. |
The establishment of evaluation parameters for larvae and juvenile quality assessment is highly desirable. The experiment evaluated the Stress Resistance Rate (Re) on Hoplias lacerdae larvae and juveniles. Larvae on the 13th, 16th, 19th, 23rd and 26th days of life were subjected to Re evaluation tests. Twenty animals were stoked in one liter beaker and kept at 27 to 28.5°C. The following treatments were applied: E3 -3 minutes; E5 - 5 minutes; E7 - 7 minutes; E10 - 10 minutes and E15 -15 minutes on drying paper. After 24 hours Re was evaluated. It was observed that Re values showed an increase from 13th to 19th day in all treatments indicating an increasing resistance related to larval development. High Re rates were observed during the whole experiment,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hoplias lacerdae; Fish larvae; Stress resistance. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500009 |
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