以黄豆[Giycine max (Linn.) Merrill]幼苗的第一真叶和第二真叶为研究对象,测定了第一真叶和第二真叶的可溶性蛋白质、光合色素、丙二醛和抗坏血酸含量以及过氧化氢酶和过氧化物酶活性。结果表明,第一真叶与第二真叶中的可溶性蛋白质...以黄豆[Giycine max (Linn.) Merrill]幼苗的第一真叶和第二真叶为研究对象,测定了第一真叶和第二真叶的可溶性蛋白质、光合色素、丙二醛和抗坏血酸含量以及过氧化氢酶和过氧化物酶活性。结果表明,第一真叶与第二真叶中的可溶性蛋白质含量没有显著性差异;第二真叶中的叶绿素a和类胡萝卜素含量高于第一真叶,分别高23.4%和89.9%,第一真叶中的叶绿素b含量高于第二真叶,高76.9%,总光合色素含量在第一真叶与第二真叶中较为接近,第二真叶中叶绿素a/b的值是第一真叶中的2.18倍;第一真叶的丙二醛含量高于第二真叶,前者是后者的3.04倍;第二真叶的抗坏血酸含量高于第一真叶,是后者的1.52倍;两真叶中未测到过氧化物酶和过氧化氢酶活性。抗坏血酸含量与可溶性蛋白质含量、丙二醛含量和叶绿素b含量为负相关,与叶绿素a含量和类胡萝卜素含量为正相关。展开更多
The adsorption capacities of new biomaterials derived from lemon leaf (Citrus sp.) toward fluoride ions have been explored by varying different physicochemical parameters such as pH, initial concentration, adsorbent d...The adsorption capacities of new biomaterials derived from lemon leaf (Citrus sp.) toward fluoride ions have been explored by varying different physicochemical parameters such as pH, initial concentration, adsorbent dose, contact time, stirring rate and temperature. The entire study was done through batch process. Maximum fluoride adsorption of 96.9% - 98.8% was achieved with an initial concentration of 10 mg/L. Langmuir isotherm model well expressed fluoride ad- sorption onto LLD-1, LLD-2 and LLD-3. According to correlation coefficient, the fluoride adsorption onto these 3 ad- sorbents was correlated well with pseudo-second-order kinetic model. From thermodynamic study, the spontaneous nature and feasibility of the adsorption process with negative enthalpy (ΔH0) value also supported the exothermic nature were shown. The rate of fluoride adsorption was mathematically described as a function of experimental parameters and was modeled through Box-Behnken (Response surface methodology). The results showed that the responses of fluoride adsorption were significantly affected by the quadratic term of pH, initial concentration, contact time and temperature and the statistical analysis was performed by ANOVA which indicated good correlation of experimental parameters.展开更多
文摘以黄豆[Giycine max (Linn.) Merrill]幼苗的第一真叶和第二真叶为研究对象,测定了第一真叶和第二真叶的可溶性蛋白质、光合色素、丙二醛和抗坏血酸含量以及过氧化氢酶和过氧化物酶活性。结果表明,第一真叶与第二真叶中的可溶性蛋白质含量没有显著性差异;第二真叶中的叶绿素a和类胡萝卜素含量高于第一真叶,分别高23.4%和89.9%,第一真叶中的叶绿素b含量高于第二真叶,高76.9%,总光合色素含量在第一真叶与第二真叶中较为接近,第二真叶中叶绿素a/b的值是第一真叶中的2.18倍;第一真叶的丙二醛含量高于第二真叶,前者是后者的3.04倍;第二真叶的抗坏血酸含量高于第一真叶,是后者的1.52倍;两真叶中未测到过氧化物酶和过氧化氢酶活性。抗坏血酸含量与可溶性蛋白质含量、丙二醛含量和叶绿素b含量为负相关,与叶绿素a含量和类胡萝卜素含量为正相关。
文摘The adsorption capacities of new biomaterials derived from lemon leaf (Citrus sp.) toward fluoride ions have been explored by varying different physicochemical parameters such as pH, initial concentration, adsorbent dose, contact time, stirring rate and temperature. The entire study was done through batch process. Maximum fluoride adsorption of 96.9% - 98.8% was achieved with an initial concentration of 10 mg/L. Langmuir isotherm model well expressed fluoride ad- sorption onto LLD-1, LLD-2 and LLD-3. According to correlation coefficient, the fluoride adsorption onto these 3 ad- sorbents was correlated well with pseudo-second-order kinetic model. From thermodynamic study, the spontaneous nature and feasibility of the adsorption process with negative enthalpy (ΔH0) value also supported the exothermic nature were shown. The rate of fluoride adsorption was mathematically described as a function of experimental parameters and was modeled through Box-Behnken (Response surface methodology). The results showed that the responses of fluoride adsorption were significantly affected by the quadratic term of pH, initial concentration, contact time and temperature and the statistical analysis was performed by ANOVA which indicated good correlation of experimental parameters.