The effects of two herbicides used wide-spread, isoproturon (phenylurea) and terbutryn (triazine), on growth, dry weight, elemental composition, photosynthetic pigments and protein content, and cell volume assayed by flow cytometry in the freshwater microalgae Chlorella vulgaris were studied. Different parameters for algal activity show widely different sensitivities to these aquatic pollutants. After 96 h of herbicide exposure, terbutryn was the strongest inhibitor of growth, giving an EC50 value for growth twice lower than that for isoproturon cultures (EC50 terbutryn=0.097 microM; EC50 isoproturon=0.199 microM). However, lower concentrations of the triazine herbicide provoked an increase in the cellular density and growth rate of this microalga, not observed in the phenylurea-treated cultures. Cellular volume and dry weight of C. vulgaris cells were increased strongly in the presence of isoproturon and terbutryn. Other cellular parameters, such as pigment and protein content, were stimulated with both herbicides at higher concentrations.
Rafael MA, Olmo MF, González OV, Jodar XA, Pérez FJV. DSJ (salto vertical sem contra-movimento a partir de flexão de joelhos acima de 120º) e corrida de velocidade de 30m a partir do repouso. Fit Perf J. 2008 set-out;7(5):319-25. RESUMOIntrodução: Descreve-se o teste de salto vertical sem contra-movimento a partir da fl exão de joelhos acima de 120º (DSJ), sua relação com os testes SJ e CMJ, e com a corrida de 30m. Materiais e Métodos: 58 homens realizaram quatro tentativas de cada teste de salto e duas tentativas de corrida de velocidade de 30m. Constata-se um coefi ciente de variação (CV=2,73) que mostra a DSJ como um teste de grande estabilidade. Resultados: Os resultados mostraram diferenças signifi cativas (p≤0,01) entre os valores obtidos em DSJ e nos testes SJ e CMJ. A análise da correlação entre os diferentes testes de salto vertical mostrou níveis altos de correlação estatisticamente signifi cativos (p≤0,01). O DSJ mostra uma intensidade de correlação mais alta com o CMJ. Ao estabelecer a relação entre DSJ e a corrida de velocidade, as correlações resultaram estatisticamente signifi cativas (p≤0,01) em todos os casos, se observando a maior intensidade com o tempo em 30m. Discussão: A boa confi abilidade mostrada pelo DSJ, seus níveis de correlação com os outros testes de salto (SJ, CMJ) e com os tempos da corrida de velocidade demonstram que DSJ é um teste efi caz para controle da força e a potência. PALAVRAS-CHAVECorrida, Força Muscular, Dinamômetro de Força Muscular. DSJ (VERTICAL JUMP WITHOUT COUNTER MOVEMENT SINCE KNEE FLEXION LARGER THAN 120º) AND 30M SPEED RACE ABSTRACTIntroduction: The vertical jump test without counter movement knees flexion larger than 120º (DSJ) is described with its relation with the SJ and CMJ the tests, and with the 30 meters race. Materials and Methods: 58 men accomplished four attempts for each jump test and two attempts for a 30 m speed race. A variation coefficient (CV = 2.73) is evidenced, which shows the DSJ as a test of great stability. Results: The results showed significant differences (p≤0.01) among the obtained values in DSJ and in the SJ and CMJ tests. The correlation analysis among different tests of vertical jump showed high levels of correlation which were statistically significant (p≤0.01).The DSJ shows a higher intensity of correlation with the CMJ. When establishing the relation between DSJ and the speed race, the correlations were statistically significant (p≤0.01) in all cases, if observing the highest intensity with time in 30 m. Discussion: The good reliability shown by the DSJ, its correlation levels with other jump tests (SJ, CMJ) and with the speed race timing show that DSJ is an efficient test to control strength and potency.
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