共查询到20条相似文献，搜索用时 78 毫秒
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<正> 绵油11(绵杂95-13)是四川省绵阳市农科所选育的甘蓝型两系杂交种。2000年通过四川省农作物品种委员会审定,列为全省重点推广品种,2002年通过国家审定,应用前景十分广阔。 1.丰产性突出,增产潜力大1998～1999年2年参加四川省油菜品种区域试验,平均比对照中油821(下 相似文献
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<正>"三北98"是由贵州油菜研究所和陕西三北华农种业有限公司共同选育的高油杂交油菜新品种。该品种高油、优质、高产、稳产,综合性状好,2008年通过国家长江中游区油菜品种审定(审定号:国审油2008023)。 相似文献
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Silicon oxynitride occurs as a mineral (sinoite) in meteorites. Equilibrium measurements are reported which provide information on the approximate ratios of pressures of oxygen to nitrogen required for existence of this phase under equilibrium conditions at elevated temperatures. This ratio is approximately 10-(15) at 1400 degrees to 1500 degrees C. 相似文献
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真核生物mRNA的稳定性的调节是调节基因表达的主要机制之一.调控mRNA的途径主要有4个:mRNA自身的序列元件(5′-帽结构、5′-非翻译区、编码区、3′-非翻译区、poly(A)尾巴、5′-和3′-两末端的相互作用),mRNA结合蛋白(5′-帽结合蛋白、编码区结合蛋白、3′-UTR结合蛋白、poly(A)结合蛋白),mRNA的翻译产物(自主调控),核酸酶、病毒等因素对mRNA稳定性的控制. 相似文献
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研究温度、光照时间对辣木油抗氧化稳定性的影响,以此选择合理的保存方式。用石油醚浸出法制成辣木油试样,以过氧化值(POV)为试验指标,采用Sehaal烘箱法和室内自然光照射法进行试验,测定不同温度和不同受热、光照时间下的POV值并计算氧化诱导时间。结果表明:不同受热时间下测得的POV值之间的差异性不显著,而不同光照时间的POV值则具有显著性差异,说明辣木油对温度比较稳定,但对光照则相反,光照时间越长抗氧化的稳定性就越差,光照氧化诱导时间仅为3.5 d。提示了辣木油应在20℃左右保存并特别注意避光,在此条件下的货架期可达304 d。 相似文献
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Fluid flows that are smooth at low speeds become unstable and then turbulent at higher speeds. This phenomenon has traditionally been investigated by linearizing the equations of flow and testing for unstable eigenvalues of the linearized problem, but the results of such investigations agree poorly in many cases with experiments. Nevertheless, linear effects play a central role in hydrodynamic instability. A reconciliation of these findings with the traditional analysis is presented based on the "pseudospectra" of the linearized problem, which imply that small perturbations to the smooth flow may be amplified by factors on the order of 10(5) by a linear mechanism even though all the eigenmodes decay monotonically. The methods suggested here apply also to other problems in the mathematical sciences that involve nonorthogonal eigenfunctions. 相似文献
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