排序方式: 共有14条查询结果,搜索用时 31 毫秒
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以甲基紫精(MV)500 μmo1·L-1在1 150μmol·m-2·s-1左右光强下处理梨树叶片,研究了水杨酸(SA)对梨树叶片光氧化胁迫的缓解效应.结果表明,光氧化胁迫导致梨树叶片光合效率下降,丙二醛(MDA)积累,并导致超氧化物歧化酶(SOD)活性降低.光氧化胁迫条件下,SA可提高叶片的光合速率,减少膜脂过氧化产物MDA的积累,提高叶片中SOD的活性并降低叶片质膜透性,减轻光氧化胁迫对细胞膜的伤害.表明水杨酸可以缓解光氧化胁迫对梨树叶片的伤害作用,且在所试浓度范围内,以300μmol·L-1的SA作用效果最好. 相似文献
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Masaaki Satoh Makoto Saito Kohsuke Tanaka Sumako Iwanaga Salem Nagla Elwy Salem Ali Takahiro Seki Seiji Okada Michinori Kohara Shinji Harada Chieko Kai Kyoko Tsukiyama-Kohara 《Comparative immunology, microbiology and infectious diseases》2010,33(6):e81-e88
In this study, we infected NOD/Scid/Jak3null mice engrafted human peripheral blood leukocytes (hu-PBL-NOJ) with measles virus Edmonston B strain (MV-Edm) expressing hepatitis C virus (HCV) envelope proteins (rMV-E1E2) to evaluate the immunogenicity as a vaccine candidate. Although human leukocytes could be isolated from the spleen of mock-infected mice during the 2-weeks experiment, the proportion of engrafted human leukocytes in mice infected with MV (103–105 pfu) or rMV-E1E2 (104 pfu) was decreased. Viral infection of the splenocytes was confirmed by the development of cytopathic effects (CPEs) in co-cultures of splenocytes and B95a cells and verified using RT-PCR. Finally, human antibodies against MV were more frequently observed than E2-specific antibodies in serum from mice infected with a low dose of virus (MV, 100–101 pfu, and rMV-E1E2, 101–102 pfu). These results showed the possibility of hu-PBL-NOJ mice for the evaluation of the immunogenicity of viral proteins. 相似文献
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Corn bran was microfluidized through a 200-μm channel in the pressure range of 124.1–158.7 MPa for 1–5 passes following the central composite experimental design. Physicochemical properties and antioxidant properties of microfluidized bran samples were measured and fitted to the second order polynomial model. The response surface equations obtained showed that all the properties examined had a positive linear relationship with pressure and a negative quadratic relationship with number of passes except for ABTS radical scavenging activity which was quadratically related to both processing parameters. The number of passes generally had a more pronounced effect on the examined properties compared with pressure. Within the experimental range, the maximum values of swelling capacity, water-holding capacity, and oil-holding capacity were respectively 10.62 ml/g d.w. (at 158.7 MPa), 5.49 g water/g d.w. (at 158.7 MPa), and 4.61 g oil/g d.w. (at 124.1 MPa); the maximum values of surface reactive phenolic content, DPPH and ABTS radical scavenging activities were 148.80 mg/FAE g d.w. (at 158.7 MPa), 50.02 μmol TE/g d.w. (at 158.7 MPa), and 47.90 μmol TE/g d.w. (at 145.9 MPa), respectively. All maximum values of the properties occurred at 5 passes. 相似文献
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针对农业生产领域存在的劳动力资源紧缺、人工采摘成本较高等问题,提出一种基于STM32的水果采摘机器人控制系统设计方案。该方案主要采用自动化采摘的方式,实现成熟水果的智能识别与采摘,利用STM32单片机作为该系统的主控芯片,视觉识别部分采用Open MV图像处理功能作为核心。通过试验验证方式对系统的可行性进行了分析,结果表明该系统可满足用户的实际使用要求。 相似文献
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旨在确定枯草芽孢杆菌262XY2´菌肥的最佳施用浓度并为其实际应用提供理论依据。以番茄和枯草芽孢杆菌262XY2´菌肥为试材,以形态观察和分光光度计测定等方法测定番茄生长与生理指标。结果显示0.5%~2%菌肥处理的生长生理指标最佳。出苗率、株高、茎粗、叶面积、地上地下部鲜干质量、壮苗指数、生长函数、根冠比、叶绿素a、b、类胡萝卜素含量、根系活力和可溶性蛋白含量最高值分别比CK高11.115%、14.589%、35.616%、91.704%、49.369%、48.330%、86.634%、85.714%、71.429%、50.000%、59.164%、86.887%、156.827%、10.589%、7.035%和54.294%,-20℃和40℃处理后相对电导率最低值分别比CK低6.483%和3.116%。施用0.5%~2%枯草芽孢杆菌262XY2´菌肥可促进番茄生长,其中0.5%菌肥处理组对番茄促生效果最为显著。 相似文献
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为了培育高产稳产、抗旱节水、多抗广适的突破性小麦品种,以高产品种‘临麦2号’为母本,以高产抗旱品种‘烟农19’为父本,采用系谱法聚合二者优异农艺性状,通过多点多生态鉴定与评价,育成小麦新品种‘济麦262’。该品种产量高,品质优良,抗病抗逆性好,农艺性状优异,水旱兼用。在2010—2011年度济南和蒙阴水浇地品比试验中,平均产量较对照‘济麦22’增产2.87%和9.41%,均居第一位;在2012—2013年度山东省旱地区域试验中,平均产量较对照‘鲁麦21’增产9.74%,是近10年来增产幅度最大的旱地小麦。该品种籽大饱满,籽粒蛋白质含量、湿面筋含量和面粉白度等品质指标优于对照品种‘鲁麦21’;抗干热风,中抗条锈病;株高67.2 cm,后期叶片功能期长,落黄佳,长方形穗,穗粒数37.5粒,千粒重44.7 g,白粒,粉质。‘济麦262’于2016年2通过山东省审定,适宜在无浇灌条件的旱肥地及水资源匮乏地区种植应用。 相似文献
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