促性腺激素(LH,FSH)对鸡卵泡孕酮分泌的影响     

李赞东  田中耕作  古贺修 《中国农业大学学报》1993,(Z1):1-7

摘出垂体12 h 后的卵泡孕酮(P_4)浓度显著下降.单独添加 LH 时第一卵泡(F_1)的P_4浓度显著增加,同时添加 LH 和 FSH 时,所有卵泡的颗粒层 P_4浓度恢复到对照的水平.但是单独添加 FSH 时无促进作用.LH 和 FSH 的处理对卵泡的卵泡膜 P_4浓度影响极小.在细胞培养液中添加 LH 和 FSH 可以促进颗粒层的 P_4合成,这种反应以 F_1最为明显.LH 和 FSH同时添加时对颗粒层 P_4合成有显著效果,但是对卵泡膜 P_4合成无明显促进作用.表明 P_4在 LH和 FSH 的协同调控下,主要在 F_1的颗粒层中合成.  相似文献   

Variation of indole acetic acid (IAA) amounts in cambial-region tissues in 7- and 24-year-old sugi (Cryptomeria japonica) trees     

Yoshio Kijidani  Naoki Ohshiro  Daisuke Iwata  Masanori Nagamine  Taiga Nishiyama  Junji Matsumura  Shinya Koga 《Journal of Wood Science》2014,60(3):177-185

Recently, breeding programs have attempted to produce high growth rates for shorter rotation cycles in plantation trees. In these trees, the ratio of juvenile wood increases; thus, the juvenile wood properties should be improved for structural use. To this end, it is important to understand the influences on juvenile wood properties precisely. In this study, we report on the indole acetic acid (IAA) amounts of juvenile sugi (Cryptomeria japonica) trees in September and compare the IAA amounts to those in mature trees. The IAA amounts at the lower trunks in juvenile trees were significantly larger than those in mature trees and the IAA amounts decreased with tree height. In each stand, except a mature tree stand, there is no significant effect of IAA amounts on latewood width and MFA. However, put together all samples, the latewood width and MFA increased with IAA amounts in samples with IAA <200 ng/cm². The samples at lower trunk in juvenile trees had significantly larger IAA amounts, larger MFA and larger latewood width than the samples in mature trees (p < 0.01). The very large IAA amounts may have a certain relation with juvenile wood properties.  相似文献   

Improvement in gluten-free rice bread quality by protease treatment     

Yasuko Kawamura-Konishi  Kazuo Shoda  Hironori Koga  Yuji Honda 《Journal of Cereal Science》2013

The wide prevalence of gluten-related disorders has led to increase in the demand for gluten-free foods. Rice is a gluten-free and less allergenic cereal. However, bread made from rice flour, i.e., gluten-free rice bread, is generally of poor quality because rice flour cannot develop a network with gluten-like properties. In this study, we investigated the effects of protease treatment on gluten-free rice to improve the quality of its bread. Bread treated with a commercial protease from Bacillus stearothermophilus (thermoase) was of higher quality, i.e., good crumb appearance, high volume, and soft texture, depending on the amount of enzyme added. Rice proteins in the protease-treated bread were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, which showed that glutelins and prolamins were hardly digested by thermoase in comparison with other proteins. Scanning electron microscopy revealed that many cellular structures were formed in the thermoase-treated bread; however, these structures were rare in the untreated control. Bread crumb color was not affected by the treatment. The staling rate was much lower for the thermoase-treated bread than for the control. These results indicate that thermoase treatment can be successfully used to improve the quality of gluten-free rice bread by partial digestion of rice proteins.  相似文献