胡杨愈伤组织继代增殖和器官发生中蛋白分子标记的研究

利用十二烷基磺酸钠聚丙烯酰胺凝胶电泳 (SDS PAGE)和等电聚焦双向电泳 (IEF 2D)对胡杨不同类型愈伤组织和愈伤组织分化不定芽过程中表达的蛋白进行了研究。发现 :不同类型愈伤组织中表达的蛋白存在着明显的差异。在光照和培养基中BA NAA值为 1时诱导产生的有极强器官发生能力的茎基愈伤组织 ,其蛋白组分明显地少于经过继代培养、器官发生能力明显下降的愈伤组织 ,表明了茎基愈伤组织本身分化程度低。实验获得了不同类型愈伤组织和愈伤组织分化不定芽过程中不同阶段所表达的特异蛋白 ,表现为经过黑暗和培养基中BA NAA值为 0 5的继代增殖培养 ,愈伤组织产生了特异的 2 4 5kDa和 5 8 6kDa的标记蛋白带 ,并且也表达了其器官发生时表达的 19kDa和 31kDa蛋白带。茎基愈伤组织在光照和BA NAA值为 0 5的条件下进行器官发生诱导并且随着愈伤组织形成分生细胞团块和不定芽原基 ,明显地表达了 2 0kDa和 5 5kDa蛋白带 ,在 2 0kDa蛋白带中含有pI为 5 5～ 6 5的特异蛋白。pI为 6 5～ 7 5的 4 3kDa为不定芽发生前期表达的特异蛋白。文中就愈伤组织器官发生能力与其表达蛋白的关系进行了讨论。     

利用异氰酸酯树脂胶和农业剩余物制造人造板的若干问题讨论

在我国森林资源缺乏的形势下,利用农业剩余物制造人造板更加必要,农业剩余物是最具潜力的替代纤维资源。本文基于作者大量的研究经历,总结和讨论了在利用异氰酸酯和农业剩余物制造人造板时,应重视的一些主要问题,包括原料准备、热压工艺、胶接技术、防止霉变等问题,以及相应的解决办法。研究认为,利用稻秸和麦秸制造人造板,最合适的胶粘剂是异氰酸酯树脂胶,同时还应选择合适的工艺、胶接办法和处理办法。表1参9。     

Dynamic properties of three types of wood-based composites

This study used a vibration test method to show that grain angles of face veneer have substantial effects on sound velocities and dynamic Youngs moduli of three types of wood-based composites. The sound velocity at 0° grain angle of face veneer was the highest, and it decreased with increasing grain angle in the range of 0° to 90°. This tendency was similar to that for dynamic Youngs modulus. The relationship between the grain angle of face veneer and the sound velocity of three types of wood-based composites can be expressed in the form of Hankinsons equation or a second-order parabolic equation. This study also showed that the application of orthotropic elasticity theory was valid for the three types of wood-based composites. The relationship between the grain angle of the face veneer and the Youngs modulus of three types of wood-based composites can be expressed in the form of the Jenkin equation, Hankinsons equation, or a second-order parabolic equation. Rule of mixture can also be used to predict the Youngs modulus of wood-based composite from the Youngs moduli of the two elements.Part of this study was presented at the 53rd Annual Meeting of the Japan Wood Research Society, Fukuoka, Japan, March 2003 and the 15th Annual Meeting of Chugoku Shikoku Branch of the Japan Wood Research Society, Higashi-Hiroshima, Japan, September 2003     

Simultaneous determination of six isoflavonoids in commercial Radix Astragali by HPLC-UV

A HPLC-UV method for the quantification of six major isoflavonoids, calycosin 7-O-beta-D-glucoside (1), formononetin 7-O-beta-D-glucoside (2), (6alphaR, 11alphaR) 3-hydroxy-9,10-dimethoxypterocarpan-3-O-beta-D-glucoside (3), 7,2'-dihydroxy-3',4'-dimethoxyisoflavan-7-O-beta-D-glucoside (4), calycosin (5) and formononetin (6), in Radix Astragali (Huangqi) was developed and validated. The method was proven to be sensitive, specific, accurate and precise, as well as effective and easy.     

赤桉材干燥终了调湿处理中的流变行为

在实验室的小型调温调湿箱中对25 mm厚赤桉干燥材进行终了调湿处理,并以切片法分析调湿过程中的弹性应变和机械吸附应变特性.结果表明:经24 h的处理,表层的吸湿效果显著,含水率上升达5%,而板材的平均含水率上升2.5%～3.0%;表层压缩弹性应变在经历处理开始3 h内的短暂上升后迅速下降,而整个处理过程中心层的拉伸弹性应变变化不大;处理9 h后,次表层的压缩弹性应力比表层的大,产生反向的应力梯度;处理中,木材表层吸湿软化发生了补充收缩,缩小了内外各层长度差异,应力减小;表层软化有效地减小乃至消除机械吸附应变,但由于干燥历史的影响,机械吸附应变的变化滞后于含水率的变化,在处理的第3～9 h间下降幅度最大.     

Change of trunk sap flow of Ginkgo biloba L. and its response to inhibiting transpiration treatment

For this paper, GREENSPAN sap flow system was used to monitor the dynamics of trunk sap flow of Gingkgo biloba. Results indicate that sap flow velocity is significantly different among different heights, depths, and directions of the trunk. Sap flow velocity at the upper position of the trunk is higher than that of the middle and lower position, but cumulative flux is not significantly different among the upper, middle and lower sections. Sap flow velocity at 10 mm reached the most and that at 20 mm the least. However, sap flow velocity at 5 mm and 15 mm was similar and was second among the four depths. Results also showed that sap flow velocity of the south was the highest, and that of the west was next. An Automatic Weather Station of HOBO was synchronously applied to measure these meteorological parameters, and the relationship between these parameters and the changes of trunk sap flow velocity were analyzed. We found that the change of sap flow velocity was a single-crest curve on clear days and multi-crest curve on cloudy and rainy days. In addition, it is also revealed that by stepwise regression analyses photosynthetical active radiation (PAR), temperature and wind speed are the main environmental factors affecting sap flow velocity. The efficient methods of reducing water transpiration of trees, including leaf pruning, overshadowing and antitranspirant spraying, were found by investigating the effects on inhibiting transpiration, which indicated that spraying of antitranspirants, leaf pruning and overshadowing could significantly reduce transpiration but the effects of leaf pruning and overshadowing were far better than that of antitranspirant spraying. Translated from Scientia Silvae Sinicae, 2006, 42(5): 22–28 [译自: 林业科学]     

毛白杨多功能新品种选育研究

观测北京、河北、河南３地点的１３年生毛白杨无性系试验林,无性系间的树高、胸径、木材密度、纤维长度等性状的差异均极显著;无性系的遗传稳定性、生长适应性、主干通直系数、树体形态系数、抗病虫指数等性状存在一定差别。材积生长量无性系×地点交互作用极显著,无性系间生长型不同（“广适型”、“高产型”、“低产型”）。无性系的材积生长量、木材密度、主干通直系数、树体系数和抗病虫害指数的重复率分别为０．５８０、０．５３６、０．３９０、０．４１１和０．５００,性状经济权重分别为０．３５、０．２５、０．１０、０．１０和０．２０,建立多功能型无性系的选择指数,其综合育种增益比对照品种≥１５％为中选优良无性系新品种。为北京、河北、河南分别选育出８个、７个和６个优良无性系,平均综合增益分别提高２３．９％、２４．９％和２１．０％;３个地点都中选的３７、３５１、９８３２和１０１２等优良无性系的平均综合育种增益提高２５．１％。所选无性系皆为雄性,显著提高了城乡绿化效应。     

刨花板厚度方向变形研究Ⅲ.刨花板厚度方向变形模型及规律的确定

对不同密度杨木刨花板、落叶松刨花板及不同厚度杨木、落叶松在不同方向的吸水厚度膨胀率进行追踪测试 ,然后进行回归拟合 ,结果表明 ,刨花板和木材的吸水厚度膨胀率方程与理论推导结果能很好的吻合 ,方程的数学形式都为 :TS(t) =a -be-t τ。由此得到刨花板的粘弹变形方程和胶接点破坏引起的变形方程的数学形式也与上式相同 ,对于机械吸附蠕变方程通过数学级数变换 ,也可得到相同的近似式。研究还表明用刨花板的吸水厚度膨胀率方程描述刨花板的尺寸稳定性 ,可得到该刨花板的最大吸水厚度膨胀率和衡量关于刨花板厚度膨胀速率的参数等信息 ,因此它更合理和实用     

苦楝中国分布区的物候区划

苦楝 (Meliaazedarach)是我国优良的乡土树种 ,它具生长快、材质优良、驱虫、耐腐、吸附烟尘能力强等特性 ;根、皮、花、果均可入药 ,对昆虫具有很强的杀伤力 ,有“天然杀虫剂”之美誉 ,是高效、低毒的广谱生物农药的原材料之一 ;苦楝也是良好的蜜源植物 ,同时苦楝果实是榨油和     

BL-甲醛消纳剂在竹地板上的应用研究

针对我国竹地板销售价格连年走低、环保要求日益严格的现状,提出了将无毒、高效、低成本、生产和使用方便的BL-甲醛消纳剂应用于竹地板生产的设想.作者使用BL-甲醛消纳剂分别在竹地板上进行了小试和中试,并分析了BL-甲醛消纳剂在竹地板上的应用前景.结果表明,使用BL-甲醛消纳剂完全可以生产出高强度、低成本、环保的竹地板;BL-甲醛消纳剂和芬兰太尔化工有限公司生产的Aerolite UP4116胶配制使用时,较佳的添加量为20%～30%;BL-甲醛消纳剂在竹地板行业应用前景广阔.