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不同细胞质雄性不育小麦中谷胱甘肽过氧化物酶活性比较 总被引:2,自引:0,他引:2
以几种具有较好应用前景的细胞质雄性不育型小麦为材料,对分蘖期小麦叶片中的谷胱甘肽过氧化物酶的活性进行了测定,实验结果表明,亲本中国春的谷胱甘肽的含量和谷胱甘肽过氧化物酶的比活最高,华麦8号次之,细胞质雄性不育小麦均低于保持系中国春与华麦8号,这可能意味着细胞质雄性不育小麦在分蘖斯植株体内清除活性氧代谢的能力的能力低于可育品种,是小麦以后发育过程花粉走向败育的内在原因之一。 相似文献
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基于Simulink和FlightGear软件的机载惯性测量单元仿真 总被引:1,自引:0,他引:1
包含动力学和运动学特性的机载IMU数据对于飞行对准等惯性系统算法研究具有重要意义。基于人在回路仿真的思想,设计了一种可包含完整飞机模型,不需要设计特定的自动驾驶仪,来实现任意机动下机载惯性测量单元仿真的方案。给出了惯性测量单元仿真模型,设计了基于Simulink、AeroSim模块集及FlightGear模拟飞行软件的新方案,实现了一个机载惯性测量单元的仿真模型,该模型采用飞行摇杆,由人实现对飞机的控制和机动飞行。仿真结果表明,采用该仿真方案,避免了复杂的自动驾驶仪设计,可以得到机动飞行条件下的机载惯性测量单元仿真数据和导航参数基准数据,方案切实可行。 相似文献
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Quantum Generalized Subspace Projector Measurement and Measurement Induced Entanglement 总被引:1,自引:0,他引:1 下载免费PDF全文
We propose the concept of the quantum generalized subspace projector measurement (QGSPM). The distinguished properties of QGSPM is revealed: no matter what the state of the system is prior to the measurement and what the measured result occurs, the state posterior to the measurement can be collapsed onto the specified subspace. Subsequently, the quantum generalized case-projector measurement (QGCPM), as a special case of QGSPM, is also discussed carefully. It is demonstrated that no matter what measured result occurs, the state of the system posterior to QGCPM can be collapsed into one of pure states. Consequently, QGCPM can be used to generate the maximally entangled pure states for multiple particles. As illustrative examples, several concrete methods of generating entanglement are proposed for two two-level particles. It is found that the maximally entangled pure states of two 2-level particles can be generated just by a single QGCPM and the corresponding QGCPM operators are physically realizable in principle if an ancillary four-dimensional quantum system can be introduced. 相似文献
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This paper explores the potential of controlling quantum systems by
introducing ancillary systems and then performing unitary operation
on the resulting composite systems. It generalizes the concept of
pure state controllability for quantum systems and establishes the
link between the operator controllability of the composite system and
the generalized pure state controllability of its subsystem. It is
constructively demonstrated that if a composite quantum system can be
transferred between any pair of orthonormal pure vectors, then its
subsystem is generalized pure-state controllable. Furthermore, the
unitary operation and the coherent control can be concretely given to
transfer the system from an initial state to the target state.
Therefore, these properties may be potentially applied in quantum
information, such as manipulating multiple quantum bits and creating
entangled pure states. A concrete example has been given to
illustrate that a maximally entangled pure state of a quantum system
can be generated by introducing an ancillary system and performing
open-loop coherent control on the resulting composite system. 相似文献
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以 HPGMR农垦 5 8S为材料 ,研究了光周期处理前、后 Ca2 /Ca M依赖性蛋白激酶 (Ca2 /Ca M- PK)活性及其酶谱特征 .结果表明 :随着幼穗的发育 ,Ca2 /Ca M- PK活性均有提高 ,并且长日照和自然日照条件下的酶活提高程度大大高出短日照处理 .不同时期、不同处理的 Ca2 /Ca M- PK酶谱带数未见明显差异 ,但在总体上 ,不育植株 (L D和 ND)的酶带弱于可育植株 (SD) 相似文献
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提出了一种新的大脑光学功能映射流程。流程设计任务为周期形式,且周期远小于血液动力学的有效时间跨度。在连续周期刺激下,皮层功能区响应进入稳态,信号表现为围绕稳态值的周期小幅振荡。利用谱分析工具提取体元序列的任务频率成分、综合谱的幅值和相位信息最终确定任务相关脑区。采用SD大鼠的后肢区(HP)作为模型,使用红光(605±10nm)作为照射源。此流程很好地消除了血管伪迹。分析发现,左右脑后肢区任务响应有先后关系。根据相位图讨论了局部微循环血液交换、动静脉网的血液交换等问题。通过实验发现了高频刺激下血管系统的共振现象。实验结果证明本映射流程是一种有价值的新型功能映射流程,相对传统方法能够得到更多的皮层神经活动时空信息。 相似文献
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通过高速离心、( NH4) 2 SO4沉淀、琼脂糖凝胶过滤和 Ca M- sepharose4B亲和层析 ,从 HPGMR( 5 8S)叶片中初步纯化出 Ca2 / Ca M依赖性蛋白激酶 .纯化的 Ca2 / Ca M依赖性蛋白激酶经 SDS-聚丙烯酰胺凝胶线性梯度电泳 ,亚基分子量约为 5 5× 10 3.在 Ca2 / Ca M依赖性蛋白激酶的标准反应体系中 ,存在过量的 ATP,提取磷酸化反应剩余的 ATP,用叶绿体 Mg2 - ATP酶分解 ATP,最后用复合孔雀绿测定无机磷 ,从而来计算 Ca2 / Ca M依赖性蛋白激酶的活性 .实验结果表明 ,该酶活性是依赖 Ca2 和 Ca M的 ,并且 EGTA和 TFP对酶活性有明显的抑制作用 相似文献