大白菜显性核不育材料9405A的育性遗传初步研究

大白菜自交系(9209)与显性核不育两用系(9405AB)的不育株(9405A)测交,F1代全部植株恢复可育,F2 代育性分离株行与不分离株行之比为11,在育性分离株行中,大部分株行内的育性比贴近13(可)3(不).这一现象表明9209与9405AB的育性与呈相对显隐关系的3个育性基因Mf(可)＞Ms(不)＞mf(可)或4个育性基因Mf(可)＞Ms(不)＞mf(可)＞ms(不或可)和两对非同源染色体上的两对等位点相关,由此构成MsmfMfmf、MsmsMfmf和MsmfMfms三类型的双基因杂合体,它的自交S1代均能产生13(可)3(可)育性比的抑制效应,若ms为不育属性时,可用具有复等位基因性质的双隐性不育基因纯合体msmsmsms(不)进行判别其前述三类型.9203AB应归属何型?尚待鉴定.     

生长猪饲粮加硒量对生产性能、组织含硒量、谷胱甘肽过氧化物酶活性的影响

38头八周龄断奶仔猪(约克夏×雅南)喂以不同水平的天然饲粮,对生产性能、组织含量,谷胱甘肽过氧化物酶(GSH～PX)活性进行了研究。未加硒猪只发生死亡,加硒量0.05ppm以下发生不同程度组织病变。加硒猪平均日增重比不加硒猪高22.8％(P<0.05),但加硒组间差异不显著。随加硒量提高,组织含硒量和血液GSH—PX活性呈二次或三次曲线上升,加硒0.3ppm全血和血浆GSH—PX活性均达稳定。发生亚临床缺乏时,肝脏、猪毛、血浆含硒量分别小于0.7341±0.066、0.208±0.027、0.094±0.008ppm,血浆GSH—PX活性小于0.78单位/毫升,死亡时,肝脏、血浆含硒量分别小于0.147±0.055、0.025±0.002 ppm,血浆GSH—PX活性小于0.57单位/毫升。冕宁天然低硒饲粮中,生长猪无机硒添加量以0.3ppm为宜。     

MDF管道与搅拌联合施胶新工艺试验

在中密度纤维板生产过程中采用管道与搅拌联合施胶新工艺，可以有效地解决产品表面存在的胶斑问题。试验表明，管道施胶部分比例达到４５％－５５％可以取得预期的效果，产品力学性能还有所提高，而胶耗量比传统的管道施胶有明显的减少。     

柑桔树体性状与产量的相关研究

通过对血橙、温州蜜柑的调查和统计分析,探明了柑桔冠径、千周、叶面积系数和末级梢数对幼树早期产量有极显著影响,其中冠径、干周是早期丰产稳产的重要树体结构基础。树冠投影面积和复盖率与群体产量的关系较密切,二者共同对产量作用的决定程度最大,又互为制约和消长。为早果丰产栽培提供了依据。     

中密度纤维板生产线水洗系统B阀的改进设计

对中密度纤维板生产线水洗系统闸板结构AB阀中的B阀进行改造,解决了漏水问题,延长了使用寿命,而且维修简易,带来显著的经济效益。     

接装纸涂胶量对卷烟滤嘴通风率的影响

为使接装纸透气度及滤嘴通风率在指标范围内保持稳定,采用单因素试验法,研究接装纸涂胶量对接装纸透气度及滤嘴通风率的影响,以及接装纸涂胶量随接装机运转速度和接装纸包角的变化关系。结果表明,1接装纸涂胶量对接装纸透气度及滤嘴通风率的影响显著;2接装纸涂胶量随接装机运转速度的提高而减少;3接装纸涂胶量随接装纸包角的增大而增加。并建立了接装纸涂胶量与接装机运转速度和接装纸涂胶量与接装纸包角之间的函数关系,经过分析计算得到了接装纸包角与接装机运行速度的数学模型。当接装机运转速度发生变化时,该模型可通过调节接装纸包角使接装纸涂胶量保持稳定,进而使接装纸透气度及滤嘴通风率保持稳定。     

Glue barriers reduce earwig damage on apricots in north-western Italy

The European earwig, Forficula auricularia L. (Dermaptera: Forficulidae), is a well-known species that is cosmopolitan and present throughout Europe. Due to its omnivorous feeding behaviour, this species can act as a generalist predator, preying on several top fruit pests, but also as a pest causing shallow gouges or holes in stone and soft fruits such as apricots, strawberries, raspberries or blackberries. In Piedmont (NW Italy), significant fruit damage has been observed lately in apricot orchards where earwigs fed on ripening fruits and made a considerable part of the produce unmarketable. In this study, we sampled earwig populations in three apricot orchards in Piedmont and tested the effectiveness of glue barriers applied to the tree trunks in reducing both earwig density in the canopy and fruit damage. The arboreal glues Rampastop® and Vebicolla® were tested both in the field and laboratory trials. Glue barriers demonstrated to be effective control measures, significantly reducing earwig abundance in the canopy and fruit damage. Rampastop® gave better results on old trees with a very rough and cracked bark, since in that case Vebicolla® could not perfectly bond with the trunk.     

新型刨花施胶系统的探讨

刨花施胶是否均匀是提高刨花板质量、减少施胶量、降低生产成本的关键。正确实施调供胶控制技术,可以合理控制刨花及胶液的流量和施胶比。本研究采用了精确的刨花、胶液流量计量控制方式。     

导电胶合板的研究

脲醛树脂中分别添加三种导电剂压制导电胶合板，可使胶层面积电阻率降至１００Ω以下。导电胶合板外加低电压时，板面温度分布的不均匀性主要来自电极处的高温区和板子边角处的低温区，小粒度的导电剂可以改善这一不均匀性，研究表明：在添加ＨＦ－２型导电粉和混加ＭＧ型稀释剂的条件下，板面温度分布均匀，中央区域的温度极差小于４℃，变异系数小于６％，并有利于改善板子的胶合强度。     

Preparation of anion-exchange resins from pine sulfuric acid lignin,one of the acid hydrolysis lignins

To utilize acid hydrolysis lignin effectively, chemical conversion to anion-exchange resin was investigated by two methods. Sulfuric acid lignin (SAL) was selected as a typical acid hydrolysis lignin in this experiment. Because it is less reactive, SAL was phenolated with sulfuric acid catalyst to yield reactive phenolized SAL (P-SAL) with p-hydroxyphenyl nuclei. One method was the restricted resinification of P-SAL followed by the Mannich reaction with formaldehyde and dimethylamine to yield a weakly basic anion-exchange resin with an ion-exchange capacity of 2.4mEq/g. Another method was to react resinified P-SAL with glycidyltrimethylammonium chloride to yield a strongly basic anion-exchange resin with an ion-exchange capacity of 2.0mEq/g. The reaction of a simple P-SAL model compound with an epoxide suggested that the phenolic hydroxyl group of the p-hydroxyphenyl nucleus had slightly higher reactivity than that of the guaiacyl nucleus.Part of this report was presented at the 47th Lignin Symposium, Fukuoka, October 2002