硒和蛋氨酸对雏鸡营养性胰腺萎缩及某些生化指标的影响

用京白Ⅲ系雏鸡进行2×2因子试验(添加蛋氮酸O,0.3％,硒O,0.2PPM),研究了饲粮硒和蛋氨酸缺乏与适量对雏鸡胰腺萎缩(NPA)及胰谷胱甘肽过氧化物酶(GSH-Px)和谷胱甘肽(GSH)的影响。结果表明,雏鸡耗硒一周后出现胰腺变性。缺硒使雏鸡胰、肝脏GSH-Px活性、GSH含量显著降低(P<0.05),GSH/GSSG比例降低。缺硒时1—4周血浆及四周的胰GSH-Px活性、胰硒含量在缺蛋氨酸组显著高于加蛋氨酸组。四周时胰脏GSH含量、GSH/GSSG比例显著低于加蛋氨酸组(P<0.01)。缺硒饲粮中添加蛋氨酸可使缺硒引起的NPA病变程度减轻。     

呼和浩特地区秋季淡水蓝藻初报

蓝藻在植物界中的分类地位是最为低等和原始的,其分布范围极为广泛。近年来,蓝藻在渔业生产、生物固氮、环境保护和监测以及植物分类系统的研究中,表现出愈来愈重要的作用。作者自1981～1989年的秋季,在呼和浩特市地区选择了十几个采集点进行采集,初步对呼和浩特市地区秋季淡水蓝藻进行了系统的调查与分类研究,这项工作在内蒙古尚为空白。根据这项研究,呼和浩特市地区秋季淡水蓝藻共有3个目,4个科,17个属,26个种,其中有7个种作为存疑种,尚需进一步研究。     

酚醛胶刨花板最佳工艺的研究

通过Ｌ９（３＾４）、Ｌ４（２＾３）两次正交试验和单因子分析的试验，得出了压制１２ｍｍ厚酚醛胶刨花板的最佳工艺条件。该条件下压制刨花板性能均达到原西德ＤＩＮ６８７６３中规定的标准。     

改性异氰酸酯树脂胶玉米秸秆皮板工艺

以异氰酸酯(PMDI)改性的脲醛胶作为胶黏剂,采用正交试验法分析了热压时间、成板密度、施胶量、胶混合比对玉米秸秆皮板主要物理性能的影响。结果表明:热压时间对玉米秸秆皮板的24 h吸水厚度膨胀率(24h TS)、弹性模量(MOE),成板密度和改性脲醛胶/异氰酸酯(UF/PMDI)的混合比例对24 h TSI、B、MOE以及施胶量对24 h TS均有高度显著性影响。在一定范围内,秸秆皮板材的物理力学性能指标随着热压时间、密度以及施胶量的增加而增大,异氰酸酯施加量的增加能持续提高板的性能。当工艺条件为:热压时间4～5 min,板密度0.9 g/cm3,施胶量12%,胶量比(UF/PMDI)7∶3时制得的板材性能最佳。     

抗根肿病桔红心大白菜甲型“两用系”转育研究

根据大白菜"核不育复等位基因遗传假说"、抗根肿病基因和球心色的遗传规律,提出抗根肿病桔红心大白菜甲型"两用系"转育模式。依照转育模式采用杂交、回交、自交、系内交和测交等方法,对不同转育世代依次进行球心色筛选、抗性鉴定、经济性状筛选和育性调查,经过4代转育得到抗根肿病桔红心大白菜甲型"两用系"。     

植物蛋白胶细木工板加工技术的研究

笔者使用的植物蛋白胶是以富含蛋白质的生物质为主要原料制备的无甲醛释放的胶粘剂。由于其初粘性不如"三醛胶"大,因此不能利用传统细木工板的生产工艺。针对该胶粘剂的特点,通过研究新的施胶工艺,确定木材含水率8%～12%,第1次预压15 min,热压第一阶段最佳工艺参数:施胶量170 g/m2,热压时间8 min,压力17 MPa,温度105℃;第2次预压15 min,热压第二阶段最佳工艺参数:施胶量155 g/m2,热压时间4 min,施胶量155 g/m2,温度100℃,压力15 MPa,板材外观能达到优等品标准,理化性能符合GB/T5849-2006的要求。     

福州宦溪野生蕉（Musa spp.，AB group）2个PSAG成员的克隆及生物信息学分析

植物光系统Ⅰ反应中心亚基V (photosystem Ⅰ reaction center subunit V,简称PSAG或PS Ⅰ-G)是光合系统Ⅰ的主要组件.具有维持PSⅠ复合体稳定性的重要作用,并与抗盐密切相关.本研究以福州宦溪野生蕉(Musa spp.AB group)叶片为材料,采用同源克隆的方法,首次分离到PSAG基因的2个成员:PSAG1、PSAG2(GenBank登录号分别为JX317082、JX317083),分别为800、827 bp,分别编码150、160个氨基酸;PSAG1、PSAG2的基因组序列分析表明2个成员均没有内含子.生物信息学分析表明:PSAG1、PSAG2具有PSⅠ的X亚基超家族(photosystem Ⅰ reaction center subunitX psaK)保守结构域,是不具有信号肽的跨膜蛋白,具有亲水性:PSAG1、PSAG2均有4个位点发生磷酸化.宦溪野生蕉PSAG在进化过程中形成了特殊的结构特征,即PSAG1和PSAG2没有内含子,并且在不同物种间保守区具有高度的一致性,为保持PSAG功能的稳定性提供了重要保证.     

Polyurethane Adhesive Ingestion

Polyurethane adhesives are found in a large number of household products in the United States and are used for a variety of purposes. Several brands of these expanding wood glues (those containing diphenylmethane diisocyanate [MDI]) have the potential to form gastrointestinal (GI) foreign bodies if ingested. The ingested adhesive forms an expanding ball of glue in the esophagus and gastric lumen. This expansion is caused by a polymerization reaction using the heat, water, and gastric acids of the stomach. A firm mass is created that can be 4-8 times its original volume. As little as 2 oz of glue have been reported to develop gastric foreign bodies. The obstructive mass is reported to form within minutes of ingestion of the adhesive. The foreign body can lead to esophageal impaction and obstruction, airway obstruction, gastric outflow obstruction, mucosal hemorrhage, ulceration, laceration, perforation of the esophageal and gastric linings, and death. Clinical signs following ingestion include anorexia, lethargy, vomiting, tachypnea, and abdominal distention and pain, and typically develop within 12 hours. Clinical signs may depend upon the size of the mass. If left untreated, perforation and rupture of the esophagus or stomach can occur. The glue mass does not stick to the GI mucosa and is not always detectable on abdominal palpation. Radiographs are recommended to confirm the presence of the “glue-ball” foreign body, and radiographic evidence of the obstruction may be seen as early as 4-6 hours following ingestion. Emesis is contraindicated owing to the risk of aspiration of the glue into the respiratory tree or the subsequent lodging of the expanding glue mass in the esophagus. Likewise, efforts to dilute the glue and prevent the formation of the foreign body through administration of liquids, activated charcoal, or bulk-forming products to push the foreign body through the GI tract have proven ineffective. Even endoscopy performed to remove the foreign body has been shown to be unreliable. The safest, most effective, and successful therapy is surgical intervention to remove the GI foreign body. If performed early enough, complete recovery of the animal can be expected. Differential diagnoses for polyurethane adhesive ingestion include any potential cause of GI obstruction. The public is largely unaware of the hazards that ingestion of this product may produce. Public education efforts are needed to inform pet owners about the hazards of these glues and the overall importance of providing our companion animals with safe, poison-free environments.     

低温等离子处理对重竹板材浸渍剥离性能的影响

采用低温等离子处理已经疏解的竹片,研究低温等离子处理对重组竹上胶量及浸渍剥离性能的影响。结果表明：随着低温等离子处理时间的增加,竹片上胶量先上升后趋于平稳,且浸渍剥离性能的变化与上胶量变化一致,其最佳处理工艺为低温等离子处理时间5 s,胶液固体含量25%,浸渍时间10 min。     

松香松节油在环氧树脂及固化剂中的应用进展

综述了国内外在利用松香、松节油合成与改性环氧树脂、固化剂方面的研究现状,以及其应用方面的进展。