兰州百合鳞片扦插繁殖技术研究

为实现兰州百合的标准化、规模化、高效繁育,以兰州百合鳞片为试材,研究不同消毒剂及其处理时间、基质配比和扦插方法对鳞片扦插的小籽球发生率、小籽球直径、生根数、根长和平均繁殖系数等繁殖指标的影响.结果表明:用多菌灵1000倍液处理10 m i n为最佳消毒方法,其小籽球发生率最高,达93.3％,小籽球直径、生根数、根长和平...     

Comparative analysis of receptor-binding specificity and pathogenicity in natural reassortant and non-reassortant H3N2 swine influenza virus

Genetic reassortment between human and avian influenza viruses can create pandemic viruses. Influenza surveillance of pigs in Jilin Province, in China during 2007–2008 revealed that there were two distinguishable genotypes: a human-like H3N2 genotype and a double-reassortant genotype derived from the human H3N2 and avian H5 viruses. In this study, viral infection potential, replication kinetics, and pathogenicity were compared. The solid-phase binding assay demonstrated that both viruses prominently maintained a preference for the human-type receptor and the reassortant A/swine/Jilin/37/2008 (Sw/JL/37/08) showed relatively higher binding affinities than the non-reassortant A/swine/Jilin/19/2007 (Sw/JL/19/07). Replication kinetics showed that Sw/JL/37/08 had higher replicability in MDCK cells than Sw/JL/19/07. The mouse experiments clearly revealed that Sw/JL/37/08 had higher virulence than Sw/JL/19/07 as measured by more significant body weight loss, higher viral lung load, delayed viral clearance from lungs, and more severe pulmonary lesions. Sequence analysis indicated that the absence of glycosylation sites at residue 126 of HA and 93 of NA, as well as the characteristic NS1 C-terminal PL residues of ESEV may account for the increased replication and pathogenicity of Sw/JL/37/08. These results may imply that human may have infection risk by the reassortant swine influenza virus and emphasize the necessity for enhanced viral surveillance strategies, which monitor reassortment events in nature to reduce the public health threat posed by influenza viruses with the potential for human-to-human transmission currently circulating in pig populations.     

11种肉及肉制品动物源性成分PCR检测技术

为建立准确的动物源肉制品检测技术,采用生物信息学方法,针对猪、牛、马、山羊、小鼠、大鼠、兔、犬、鸡、鸭、鹅等11种动物肉类的特异性基因,建立了特异性PCR检测技术。该技术可高特异性检测猪、牛、马、山羊、兔、犬、鸡、鸭、鹅源肉样,并可鉴别掺入的大鼠、小鼠等违禁肉类成份,最低检测限为1.00 ng/μL基因组DNA,以及低至1%的肉类添加量。运用该技术在市场中随机抽检3种初加工肉制品各10份进行验证,结果在每种肉制品中均检出掺假样品,不同种类肉品的掺假率为10%～20%。本研究建立了具有高灵敏、准确、低成本、适用范围广等优势的肉制品动物源性成份检测技术,为消费市场肉制品质量检测提供了技术支撑。     

白泉山生态公园建设对城市生态环境的影响

文章从白泉山生态公园的区位优势、效益分析等方面对城市生态文明建设的作用进行了论述。     

拯救紫檀

文章简述了紫檀生物学特性,分析拯救的必要性,提出拯救方法和内容,达到扩大紫檀种群数量和保护珍稀濒危物种之目的。     

小果型西瓜品种对比试验

为选择适合大兴地区种植的小果型西瓜,选用由日本蔌原公司引进的KM、L555和L600作为试验品种．与本地传统优良品种京秀进行对比试验。结果表明：4个品种植株生长势较为一致。商品瓜产量品种间差异不显著．其中L600最高,每667m2产量为2932kg。4个品种皮厚差异不大,均在0．5～0．6mm之间。中心可溶性固形物含量品种间差异不显著,其中L555最高为11．74％。边缘可溶性固形物含量KM最高为10．11％,L555次之,京秀最低且与前两者存在显著差异。供试品种VI感均为酥脆,纤维含量少,各品种间差异不大。引进的3个试验品种中KM和L555优于对照．L600与对照相当．所有试验品种均适合在大兴区进行推广种植。     

拟南芥β-罗勒烯合成酶基因T-DNA插入突变体的鉴定

β-罗勒烯（β-Ocimene）是一种单萜挥发性有机物,亦是一种重要的植物通讯信号分子。为了进一步研究β-罗勒烯的作用机理,需要获得β-罗勒烯合成酶基因表达沉默的实验材料。根据TAIR网站上公布的β-罗勒烯合成酶信息,从美国拟南芥生物资源中心购买该基因的T-DNA插入突变体材料,运用双引物法对这些突变体进行了T-DNA插入位点的鉴定,获得8株稳定遗传的纯合突变体,该结果为深入研究β-罗勒烯的功能奠定了良好基础。     

An improved method for rapid quantitative analysis of the insoluble dietary fiber in common cereals and some sorts of beans

An improved rapid analysis for determining the content of insoluble dietary fiber (IDF) in common cereals and some sorts of beans is described in this paper. The procedure includes starch gelatinization in water bath for 20 min at 100 °C and 2.5% (w/w) α-amylase hydrolyzed reaction followed by neutral detergent wash and acetone extraction. Compared with 1.5 h for filtration (estimated) and 18 h for the enzymatic hydrolysis required by the typical American Association of Cereal Chemists (AACC) method, the filtration and enzymatic treatment procedures in the improved method was completed within 15 min and 1.5 h, respectively. The length of time for the filtration and the enzymatic hydrolysis for the improved method was significantly shortened from 19.5 h (AACC method) to 1.75 h. In addition, orthogonal array design (OAD) has been applied to optimize parameters of the improved method. The recovery yield of microcrystalline cellulose was 97.75% (w/w), in agreement with the result obtained using the typical AACC method, demonstrating the reliability of the improved method. Furthermore, several common cereals and beans were employed to validate the accuracy and universality of this improved method.     

奶牛乳腺中乳成分前体物对乳成分合成影响的研究进展

乳成分的含量及组成直接影响牛乳的品质.本文主要综述了乳腺中乳成分前体物对乳糖、乳蛋白质和乳脂等合成的影响,为进一步提高乳脂和乳蛋白质产量,改善牛乳品质提供参考.     

牛源非结核分支杆菌血清型的初步鉴定

为了解近年来长春地区非结核分支杆菌血清型流行情况,及时掌握本地区的优势血清型,以利于疫苗株的选择和免疫程序的制定,更好地控制由非结构分支杆菌引起疾病的发生和流行.对从长春地区屠宰牛的颌下淋巴结和肠系膜淋巴结中分离得12株非结核分支杆菌制备抗血清,通过Schaefer的凝集反应和凝集素吸收试验,初步将其分为5种血清型.