目的 考察选矿药物十二胺经口给药的急性毒性作用.方法 用寇氏法计算十二胺的半数致死量LD50.将7周龄清洁级KM小鼠64只随机分成8个剂量组，雌雄各半.按0.2 mL/10g一次性灌胃.密切观察14 d内动物的中毒症状、外观体征和死亡情况，记录体重变化，所有动物均进行全身器官大体解剖及病变组织病理学检查.结果 十二胺灌胃给药对KM小鼠的LD50是1023 mg/kg(1100 ～ 950.6 mg
The type Ⅱ bacterial CRISPR/Cas system is a very valuable genome-engineering tool, which has been widely used in genome editing of variety of organisms.Previously, we generated the floxed alleles in r
Objective EphB2 is a member of receptor tyrosine kinases RTKs) family that is essential for the cell adhesion,neural crest migration, axon guidance and synaptogenesis in the nervous system.Recent stud
目的 测定海安县褐家鼠凝血酶原时间(PT).方法 PT测定采用仪器法,PT采用国际标准化比值(INR)表示.结果 褐家鼠平均PT值为0.71,其中雌鼠为0.71,雄鼠为0.73；对照大鼠PT均值为0.88；经t检验,两种鼠的PT均值比较有统计学意义(t=-3.228,P＜0.01).结论 此次实验所测得的褐家鼠PT值范围为0.64～0.78,褐家鼠与对照大鼠的PT均值有差异,其原因有待于进一步研究
Neural restoration has been proved to be difficult after brain stroke especially in its later stage.This is mainly due to the generation of an unpropitious niche in the injured area, including loss of
Wheat floral organ is directly related to kernel number per tiller.Characterizing genes specifically expressed in wheat flowers could help us understand and control floral organ development, and event
Heading date is a major determinant of adaptability and yield potential in rice (Oryza sativa L.) and is influenced by photoperiod.Among chromosome segment substitution lines (CSSLs), the introgressio
In plants, endogenous small RNAs, including microRNAs (miRNAs) and trans-acting small interfering RNAs play an important role in biological processes such as development and stress responses.While the
Alkaline/neutral invertases (A/N-Invs) have attracted more attention due to the increasing findings in their physiological significance, subcellular locations and enzymatic properties.In Hevea brasili
NF-Y (NUCLEAR FACTOR-Y), a heterotrimeric transcription factor, is composed of NF-YA, NF-YB, and NF-YC proteins in yeast, plant, and animal systems.In plants,each of the NF-YA/B/C subunits forms a mul