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81.
Physiologic and yield effects of mixtalol at various concentrations sprayed on rape at the anthesis stage were examined. Foliar sprays of 4 and 2 ppm mixtalol significantly increased the chlorophyll content of rape leaves and pods, reduced the accumulation of malondialdehyde and ethylene production, and delayed the degradation of superoxide dismutase and catalase activities of the rape plant. Mixtalol also increased root oxidizability. Meanwhile, the number of branches and pods per plant was increased, and a 10.7% and 8.2% increase of seed yield over the controls was observed with treatments of 4 and 2 ppm mixtalol, respectively. No significant effects from mixtalol were observed on the maturation of plants or on the seed oil content or the erucic acid and glucosinolate content. Total rape oil production increased with 4 and 2 ppm mixtalol significantly by 12.4% and 10.5%, respectively, over the controls.Abbreviations MTL
mixtalol
- MDA
malondialdehyde
- TBA
thiobarbituric acid
- SOD
Superoxide dismutase
- CAT
catalase
- TTC
tetrazolium 相似文献
82.
83.
Tian-Su Zhou 《Plant cell reports》1995,15(3-4):181-185
Characteristics of the hyperhydric protocormlike-bodies (hPLBs) and the normal PLBs (nPLBs) of Doritaenopsis are morphologically and ontogenetically compared. The hPLBs have a translucent and turgid appearance which is due to a lack of air volume in the intercellular spaces. The hPLBs have a lower capacity of shoot formation but a higher capacity of differentiation of new PLBs than the nPLBs. The new PLBs derived from the hPLBs can be recovered from hyperhydricity using a medium containing potato juice. This suggests the possibility that hPLBs can be used for the in vitro propagation of orchid plants.Abbreviations PLB
Protocorm-Like-Body
- mVW
Modified Vacin and Went Medium 相似文献
84.
S. M. Renaud H. C. Zhou D. L. Parry Luong-Van Thinh K. C. Woo 《Journal of applied phycology》1995,7(6):595-602
The effect of temperature from 10 °C to 35 °C on the growth, total lipid content, and fatty acid composition of three species of tropical marine microalgae, Isochrysis sp., Nitzschia closterium, N. paleacea (formerly frustulum), and the Tahitian Isochrysis sp. (T.ISO), was investigated.Cultures of N. closterium, Isochrysis sp. and T.ISO grew very slowly at 35 °C, while N. closterium did not grow at temperatures higher than 30 °C or lower than 20 °C. N. paleacea was low-temperature tolerant, with cells growing slowly at 10 °C. N. paleacea produced the highest percentage of lipids at 10 °C, while the other species produced maximum amounts of lipid at 20 °C. None of the species maintained high levels of polyunsaturated fatty acids (PUFAs) at high growth temperature and there was a significant inverse relationship between the percentage of PUFAs and temperature for N. paleacea. A curved relationship was found between temperature and percentage of PUFA for N. closterium and tropical Isochrysis sp., with the maximum production of PUFA at 25 °C and 20 °C, respectively. The two Nitzschia species produced higher levels of the essential fatty acid eicosapentaenoic acid [20:5(n-3)] at lower growth temperatures, but the two Isochrysis species had little change in percentage of 20:5(n-3) with temperature. Only T.ISO had the highest percentage of 22:6(n-3) at lowest growth temperature (11.4% total fatty acids at 10 °C).School of Mathematical and Physical SciencesAuthor for correspondence 相似文献
85.
The dissociation constants for the binding of ferric enterobactin with FepA and FecA are quantitated with displacement experiments. It is found that K
d for FepA is 12 times lower than the one for FecA. This indicates that FepA is an high-affinity receptor while FecA binds ferric enterobactin with a lower affinity. Monoclonal antibodies specific for binding epitopes of FepA inhibit the binding of ferric enterobactin with purified FepA. These same antibodies do not inhibit the binding of ferric enterobactin with purified FecA. This indicates that the binding epitopes in FecA and FepA are different. 相似文献
86.
87.
损毁和刺激垂体对大鼠痛阈的影响 总被引:1,自引:0,他引:1
采用局限性损毁和刺激垂体的方法,以行为测痛为指标,观察大鼠垂体在痛觉调节中的作用以及地塞米松(Dex)对其影响。实验结果显示,损毁垂体中间叶(IL)及邻近的前叶(AL),大鼠痛阈明显低于手术前的痛阈(P<0.01)。电刺激垂体的上述同样部位,大鼠痛阈明显高于手术基础值及自身假刺激值(P<0.001)。经Dex处理的动物,电刺激垂体不再引起痛阈升高。结果表明,大鼠垂体IL及靠近AL与痛调节有关,这种 相似文献
88.
89.
本文通过研究提出了一种由大肠杆菌细胞中提取重组猪生长激素的方法。提取回收率为52.4%,纯度为94.1%,具有生物学活性。 相似文献
90.
将单拷贝人α心钠素基因3′端用Ban Ⅱ酶解除去包括终止密码在内的36个碱基对,代之以人工合成的含Glu-Lys-Phe-Glu连接片段与另一单拷贝人α心钠素基因的5′端串连成编码60肽的双拷贝心钠素基因,克隆于大肠杆菌分泌型表达载体pIN-Ⅲ-OmpA_2质粒中,表达生成60肽的双拷贝人α型心钠素衍生物,在信号肽的作用下分泌至胞膜间质并自动切割为60肽的外源基因产物。分子量约8K的表达产物用分子筛或超滤膜分离后再经HPLC纯化,表达产物具有明显的心钠素放免活性和舒张血管活性。 相似文献