Onset of luteal activity in foaling and seasonally anoestrous mares treated with artificial light.

Sixty-four mares (27 foaling, 37 barren or maiden), mainly Finnhorses, were subjected to treatment with 14.5 h of light and 9.5 h of darkness, starting at the beginning of December. The onset of cycling in non-foaling mares was estimated by weekly serum progesterone determinations. All of the non-foaling mares cycled in the middle of March. They started to cycle on average in the middle of February, 11.1 weeks after the beginning of the trial. There were statistically significant differences in relation to breed (Finnhorses started to cycle 2 weeks later than warm blooded, p less than 0.02) and in relation to age (brood mares with mean age 10 years, started to cycle 10 days later than those 3 years old, p less than 0.03). However, there was no statistical significant relation to previous lactation, although lactating mares lactating up to the previous autumn started to cycle 7 days later than dry mares (p less than 0.15). Artificial insemination of 14 mares in the 2nd oestrus of the year, in March, resulted in 12 foalings in the subsequent year (86%). The following winter, all pregnant mares (N = 27) were exposed to the same kind of light treatment, starting on 1st December. The 1st mare foaled at the end of January. The time from foaling to 1st post partum ovulation was significantly longer (17.0 days) in foalings taking place within 10 weeks from the beginning of the light treatment period, than in foalings occurring after more than 10 weeks of lighting (12.1 days) (p less than 0.01).     

6-BA缓解黄瓜弱光胁迫的浓度研究

在温室条件下,研究喷施不同浓度6-苄氨基嘌呤(6-BA)对弱光条件下不同类型黄瓜气体交换参数和叶绿素荧光参数的影响。结果表明,华南型杂交组合‘07QP56’在10 μmol/L 6-BA处理条件下,欧洲迷你型杂交组合‘07QP51’在2,5 μmol/L 6-BA 处理时,可以较为明显地缓解由弱光导致的饱和光合速率(A_sat)、气孔导度(Gs)和蒸腾速率(Tr)降低的现象。同时,10 μmol/L 6-BA处理对缓解弱光下‘07QP56’的PSⅡ潜在活性(Fv/Fo)、原初光能转化效率(Fv/Fm)的降低也有一定的效果。‘07QP51’较‘07QP56’耐弱光,并且对高浓度6-BA处理也更为敏感。     

基于MATLAB的强度分布曲线的拟合研究

介绍一种基于Matlab拟合工具箱实现对小鼠皮肤的OCT强度信息进行拟合的方法。采用了单次散射模型和基于EHF理论的多次散射模型进行对比。各项参数表明多次散射模型在拟合包含多层皮肤结构信息的OCT信号强度时,拟合效果较好。     

光照和温度对中型滇丁香种子萌发的影响

采用室内发芽试验法研究了不同光照和温度条件对中型滇丁香种子萌发的影响。结果表明,中型滇丁香种子的萌发需在有光照的条件下进行,在有光照状况下中型滇丁香种子萌发的最适温度为25℃。在此温度条件下,其种子12～14天开始萌发,2～3周萌发完全,种子发芽率可达98%。以25℃为界,温度的升高或降低均会降低其种子的发芽率。     

一品红不同品种叶片叶绿素荧光特性比较

 利用叶绿素荧光技术测定了一品红4个品种‘金多利’、‘圣诞天使’、‘索诺拉飞雪’、‘旗帜’叶片光强依赖的叶绿素荧光特性。结果表明: ‘金多利’初始荧光( F_o ) 、最大荧光( F_m ) 和可变荧光( F_v ) 值极显著高于其它3个品种。在各个光强( PAR, 0～2 171μmol·m^{- 2} ·s^{- 1} ) 下, 表观电子传递速率( rETR) 、实际光化学效率(Yield) 和光化学淬灭( q_P ) 的变化趋势一致, 均为‘金多利’ > ‘圣诞天使’ > ‘索诺拉飞雪’ > ‘旗帜’, 在高PAR下这种差异更明显。拟合参数最大潜在相对电子传递速率( rETR_max ) 、半饱和光强( Ik) 和光抑制参数(β) 也同rETR等具有一致变化。说明‘金多利’有较高的PSⅡ活性, 耐强光; 而‘旗帜’则光化学效率较弱, 高光强下易受光抑制。     

球声源作振动时两种声强计算方法的比较

采用间接测量技术计算声强时，是用两传声器各自测得的声压进行算术平均，用其平均值代替被测点声压，分析发现：在高频区误差较大。应用两测点声压的几何平均值代替被测点的声压，并以作振动的球声源为例，对基于这两种计算声压的方法得到的声强误差进行比较，结果表明：对作振动的球声源，几何平均声强计算误差曲线比算术平均声强计算误差曲线随波数或频率的变化具有更平缓的特性，随着△r／r的增大，曲线上误差为零的点向着波数或频率增大的方向移动，且这种移动算术平均声强比几何平均声强更敏感，所以由几何平均声压得到的声强更适合于更宽频率范围的测量。     

聚合物发光二极管的研究进展

对共轭聚合物中进行电运输及电致发光器件－聚合物发光二极管的研究进展进行了综述。     

光照在蛋鸡养殖中的合理应用

蛋鸡对光照周期、光照时间、光源性质和光照强度都有着特殊的敏感性和反应性。适宜的光照对鸡的活动、物质代谢、生长发育和生产力都有重要作用,特别是光照可以刺激蛋鸡性激素分泌,加快卵子形成与排出,提高蛋鸡生产性能。总结了一套合理的蛋鸡光照管理方法,在蛋鸡养殖过程中起着积极的指导作用。     

路灯照射对大豆生长发育和产量的影响

通过对淮北五马路沿线夏大豆的田间调查分析表明：受路灯照射的影响，夏大豆株高增加，开花期、成熟期推迟，底荚部位上升，单株生产力下降。且距离越近，植株越高，开花、成熟越晚，底荚部位越高，单株生产力越低。     

光质对草坪草生长发育影响的研究进展

综述了不同光质对作物及草坪草生长发育影响的研究进展，指出研究光质对遮荫草坪中草坪草生长发育的影响具有一定意义，提出了遮荫草坪中光质的研究方向。