Nitrogen, Phosphorus and Potassium Concentrations in Developing Maize Grains

A 2-year (1989, 1990) experiment was conducted in the Carpathian Basin near Keszthely, Hungary to evaluate the course of nitrogen (N), phosphorus (P) and potassium (K) concentrations in the developing grain. Two maize hybrids were grown at four rates of N application (0, 50, 150 and 250 kg N ha^-1). Plots had been fertilized at these levels since 1983. As a result of the long-term N treatments, stocks of P and K in the soil decreased as the rate of N application increased. As expected, concentrations of N in the mature grains were higher at high doses of N, whereas the rate of N application had little impact on the P and K concentrations in the ripe grains. Only in 1989, when grain yield showed a relatively stronger response to applications of N than in 1990, were the concentrations of P and, to a lesser extent, K reduced by additions of N. These results illustrate that P and K concentrations in the grain are well-buffered against increments in grain yield resulting from the application of N and are also relatively insensitive to low supplies of P and K in the soil. In both hybrids, concentrations of N, P and especially K declined considerably with ongoing grain filling, irrespective of N treatment. Differences in concentrations of P and K for hybrids existed but were not consistent across years.     

华山新麦草2Ns染色体SCAR标记的开发

为准确快速地建立小麦-华山新麦草杂交后代的分子标记鉴定方法,利用180条长度为10 bp的随机引物R1~R180对小麦-华山新麦草全套（1Ns~7Ns）二体附加系及其亲本华山新麦草和普通小麦7182共9个材料进行了RAPD分析。结果表明,R131在华山新麦草和小麦-华山新麦草2Ns二体附加系中可以扩增出特异条带。将该特异条带回收并测序,发现其全长为1 126 bp,对其进行序列比对分析后设计SCAR引物S131,然后利用S131重新对9份材料进行了SCAR分析。结果显示,S131只在华山新麦草和小麦-华山新麦草2Ns二体附加系中扩增出特异性条带,表明RAPD标记R131已成功转化为可靠、特异的SCAR标记S131。这个新的SCAR标记可用于检测普通小麦背景下华山新麦草2Ns染色体。     

A novel technique for ventral orbital stabilization: the masseter muscle flap

Loss of the caudal maxilla and ventral orbit after tumor resections can have negative functional and esthetic influences on the eye involved. This article reports on a case of a caudal maxillary acanthomatous ameloblastoma involving the ventral orbit that was resected and stabilized with a masseter muscle flap. The masseter muscle flap was generated from the superficial belly of the masseter muscle in order to close a defect in the orbital rim, created by a caudal maxillectomy. None of the published complications such as enophthalmos, excessive lacrimation, globe deviation, or strabismus were noted, 8 months following the procedure. The only clinical sign present at the time of re‐evaluation was mild lacrimation. The authors propose the use of a masseter muscle flap as a viable technique in stabilizing the ventral orbit after caudal maxillectomy and ventral orbitectomy, preventing the complications associated with this surgery.     

花前不同时段夜间增温对冬小麦旗叶光合特性及产量的影响

全球变暖表现出夜间增温幅度大于白天的非对称性增温特点,小麦作为温凉型作物,产量和生理特性易受非对称性增温的影响。为探究花前夜间增温对冬小麦光合特性及产最形成的影响,以春性品种扬麦18和半冬性品种烟农19为试验材料,采用大田盆栽方式,利用被动式增温装置分别在分蘖期至拔节期(WT-J)、拔节期至孕穗期(WJ-B)、孕穗期至开花期(WB-A)三个时间段进行夜间增温处理,以不增温为对照(CK),分析经过三个花前不同时段夜间增温后小麦旗叶光合特性及产量特性的变化。结果表明,花前夜间增温使小麦旗叶灌浆期的净光合速率、蒸腾速率、气孔导度和胞间CO₂浓度均有所增加,WT-J、WJ-B处理均提高了冬小麦旗叶面积、最大光化学效率和实际光化学效率,同时使旗叶气孔密度和气孔指数较CK分别增加了12.64%、8.45%和10.21%、7.56%。扬麦18、烟农19的可孕小穗数在WT-J处理下较CK分别提高了9.01%和5.25%。扬麦18开花期干物质积累量在WT-J和WJ-B处理下较CK分别提高了13.18%和10.23%,烟农19在WT-J和WJ-B处理下较CK分别提高了16.21%和1...     

食品工程原理课程创新改革与实践

针对“食品工程原理”课程教学存在的问题，基于“雨课堂”等信息手段进行混合教学，建立动静交替、线上线下结合的结构化教学模式，并融合学研结合和赛教互促，提升学生解决复杂工程问题的能力。该课程教学新范式取得显著效果，为其他高校相关课程建设的改革与发展提供范例，对食品工程类相关课程的建设具有引领和示范作用。