Effects of a new light source (cold cathode fluorescent lamps) on the growth of tree peony plantlets in vitro

The effect of a new light source, cold cathode fluorescent lamps (CCFLs), on the growth of peony (Paeonia suffruticosa cv. ‘Wu Long Peng Sheng’) plantlets in vitro was examined in six different light quality ratios: 100% red (R), 80% R + 20% blue (B), 70% R + 30% B, 60% R + 40% B, 100% B and white CCFLs. Control illumination was provided by conventional heat-generating plant growth fluorescent lamps (PGFLs). All plantlet growth parameters were as effective under 70% R + 30% B (the best performing CCFL ratio) as they were under PGFLs. Chlorophyll content (a, b and total) was greater in the range of 60–80% R + 20–40% B, although in general there were no significant differences between the best performing R:B ratio and PGFLs. This study indicates that CCFLs can be used as effectively – if not better – than conventional PGFLs to micropropagate this woody ornamental.     

红蓝LED光全生育期照射对樱桃番茄果实品质的影响

采用红蓝组合LED光源全生育期照射植株,研究不同配比的红蓝光对樱桃番茄果实品质的影响。结果表明:蓝光占60%时,单果质量和单株果数都显著大于其他处理,蓝光比例增大促进果实中番茄红素、可溶性固形物、游离氨基酸和类黄酮的形成,提升糖酸比值;红光比例增大促进果实中可滴定酸的形成;蓝光所占比例为50%时,果实中可溶性蛋白含量较高,比例提高到60%时蔗糖、可溶性糖、VC含量较高;而蓝光所占比例为25%时果实中番茄红素、可溶性固形物、可溶性蛋白含量较低,且可溶性糖、蔗糖、游离氨基酸、花青素的含量都较低。说明樱桃番茄果实品质明显受光质的调控,在一定范围内,红蓝光比值对果实营养品质的影响无质的差异,当蓝光所占比例较大时,有利于营养物质的积累,蓝光占25%时不利于果实品质的提高,蓝光占60%较有利于果实品质的提高。     

蓝藻泥干发酵潜力研究

探讨藻泥干式发酵资源化利用的潜力。以太湖脱水藻泥为原料,进行干式厌氧发酵产沼气试验,分析蓝藻干式发酵的可行性。结果表明,接种物与蓝藻体积比为3∶7时,在恒定温度为35℃的发酵环境中发酵42d,蓝藻TS产气潜力为352.31mL/g,VS产气潜力为381.59mL/g,产气高峰时沼气中甲烷的含量为67.25%,蓝藻TS利用率为50.15%,VS利用率为52.39%,TOC利用率为53.86%。蓝藻泥可以作为发酵原料直接进行干式发酵。     

Susceptibility of thermo-hydro-treated birch plywood to mould and blue stain fungi

In this study, mould and blue stain susceptibility, capillary water uptake (CWU) and microstructural properties of two thermo-hydro-treated (THT) birch plywood products A and B were investigated. Plywood A represented a THT industrial plywood glued with a phenol formaldehyde (PF) adhesive. Plywood B represented panels from THT veneers glued with a PF film. The THT regimes were (temperature, °C/time, min): 150/10, 150/50, 160/10 and 160/50. Both THT plywood products and untreated samples were resistant to mould and blue stain growth in 1 month of exposure in laboratory and outdoor conditions. A statistically significant correlation between fungal growth in laboratory and outdoor conditions for plywood products A and B was not found (P?>?.05). Artificial weathering of both plywood products provided adverse fungal growth results compared to the natural weathering test outdoors. The fungal growth on plywood A and B samples mutually strongly correlated (P?相似文献   

马尾松木材材性特点及加工利用研究

马尾松是我国松属树种中地理分布最广的一种,也是南方的造林先锋树种和主要用材树种。文中从物理力学性能、纤维特性以及渗透性等方面论述了马尾松木材材性特点,介绍了马尾松木材干燥及脱脂处理技术、木材蓝变及其防治方法,总结了马尾松木材在实木利用、人造板生产等领域的应用现状,展望了马尾松木材加工利用的发展前景。     

拟南芥RPT2与RIP1互作调节下胚轴向光弯曲的功能鉴定

拟南芥突变体rpt2-2表型类似于蓝光受体双突变体phot1 phot2, 缺失强蓝光诱导的下胚轴向光弯曲, 不同于双突变体phot1 rpt2-2下胚轴向光性正常, 表明在RPT2上游存在受PHOT1抑制的旁路调节途径。本文以RPT2为诱饵蛋白进行酵母文库筛选, 成功筛选到包括JAC1 和PHOT1在内的6个与RPT2互作的蛋白(RIPs, RPT2 Interacting Proteins)。酵母互作验证显示, 其中有4个蛋白可以与RPT2相互作用。表型分析显示基因RIP1对应的2个突变体rip1-1和rip1-2, 发现rip1-1和rip1-2单突变体下胚轴向光弯曲正常, 而rpt2-2 rip1-1和rpt2-2 rip1-2双突变体表型类似于phot1 rpt2-2双突变体, 恢复拟南芥下胚轴向光弯曲反应, 暗示RIP1蛋白可能调节PHOT1介导强蓝光抑制反应, 分析鉴定蛋白RIP1的生物学功能将有助于揭示PHOT1介导强蓝光抑制反应的机制。     

Improved hatchery‐rearing techniques for juvenile production of blue swimming crab,Portunus pelagicus (Linnaeus, 1758)

The effects of tank colour, larval stocking density, antibiotic administration and water exchange on survival and moulting of blue swimming crab, Portunus pelagicus, were determined. Circular 4‐m³ experimental larval‐rearing tanks were used in triplicate for all treatments. White, dark grey, blue and brown were tested as tank background colours. The stocking densities tested were 10, 20, 40, 60, 80 and 100 larvae L^?1. The effect of oxytetracycline was estimated by comparing a treatment with oxytetracycline to a treatment without oxytetracycline administration. The daily water exchange rates tested were 0%, 25%, 50% and 100% of the tank volume. In all treatments, the larvae were fed with Artemia nauplii, rotifers and encapsulated Spirulina. The highest percentage survival was observed in the dark‐grey tanks when the stocking density of larvae was 20 larvae L^?1. No larva reached the juvenile crab size in white tanks. No significant difference in survival was found between treated and non‐treated larvae with oxytetracycline when the daily water exchange rate was more than 50%.     

几种双孢蘑菇菌株对稻草降解能力的研究

以蘑菇属的5个菌株为试材,采用Bavendamm显色反应、RB亮蓝平板变色反应、Eriksson变色圈试验及木质降解试验等方法,研究双孢蘑菇对稻草的降解能力。结果表明:通过Bavendamm平板和RB亮蓝平板显色试验,初步判断2796及A5,优于其它菌种,有较高的木质素降解相关酶系(木质素降解酶;木质素过氧化物酶;锰依赖过氧化物酶)活力;这2种菌种进一步通过变色圈和降解试验,表明2796为选择性降解纤维素的菌种,而A5为选择性降解木质素的菌种,但2796对木质素的降解率为39.82%,A5仅为20.91%,说明菌种对木质素的选择性降解与否与其降解率之间没有相关性。     

流动注射化学发光法测定茶叶对羟自由基的清除率

建立了Fe²⁺-H₂O₂-亚甲基蓝化学发光新体系,并用于茶叶对羟自由基（·OH）清除率的测定。实验发现,在酸性介质中,Fe²⁺和H₂O₂在线生成的·OH与亚甲基蓝反应能产生极强的化学发光,茶叶提取液可清除溶液中部分·OH,使化学发光强度降低。据此,结合流动注射技术,建立了测定茶叶对·OH清除率的化学发光新方法。对不同茶类的成茶及苦丁茶和绞股蓝茶清除·OH作用进行了比较研究,结果表明,绿茶对·OH的清除率最高,抗氧化活性最强。