核型多角体病毒对斜纹夜蛾两种酶活性的影响

对感染核型多角体病毒的斜纹夜蛾(Spodoptera lituta)幼虫血淋巴酯酶和酚氧化酶进行了电泳分析,结果表明,两种酶的谱带在感染病毒后12h发生了明显的变化,导致酶带位移和新酶带的产生,在虫体内建立了新的酶系统;酚氧化酶比活性在感染核型多角体病毒后12 h最低,48h达到最高点.     

油青四九菜心细胞核不育系转育研究

[目的]探索油青四九菜心细胞核不育系的转育。[方法]以法45抗热大白菜不育系为不育源,通过常规杂交转育得到油青四九菜心细胞核不育系、新甲型两用系和临时保持系。[结果]用可育品系与雄性不育系中不育株和甲型两用系中不育株杂交,以及新甲型两用系中可育株正反交,测定15个菜心可育品系基因型均为MsfMsf。按雄性不育系杂交转育方案,育成了大白菜细胞质油青四九菜心的新甲型两用系,雄性不育系和临时保持系。按照回交转育方案,完成了大白菜细胞质和菜心细胞质4个世代雄性不育系的转育,其后代雄蕊育性分离比例完全符合回交转育模式。[结论]在雄性不育系的转育过程中,注意同型株的选择,会有很好的转育效果。     

小鼠卵母细胞去核方法的研究

用 McGrath 和 Solter 的去核方法和改进的胚胎染色体制备技术,研究小鼠卵母细胞去核的基本方法及吸出的胞质量和极体的有无对去核率的影响。实验表明:(1)小鼠卵母细胞透明带弹性很差,去核操作成功率仅53.8%;(2)制备卵母细胞染色体,无需用秋水仙素等处理,直接经2～3min 低渗处理便可使第2次减数发裂中期染色体充分展开;(3)小鼠卵母细胞去核时抽1/4胞质的染色体全部去除率(49%)和抽1/3胞质的(54%)差异未达到显著水平(P>0.05);(4)注射 HCG 后15～16h 获取的小鼠卵母细胞,只有1/3左右具有明显的第1极体;抽取无极体卵母细胞之卵周隙较大一侧的细胞质,去核率与见极体卵母细胞的无明显差异。     

柞蚕核蛋白CREB的初步分离鉴定

从柞蚕蛹血淋巴细胞中提取总核蛋白,利用SDS-PAGE法对它进行分离,并采用免疫印迹法对核蛋白CREB进行初步鉴定.核蛋白经电泳分析出现了7条主要的蛋白质谱带,其分子量分别为118,90,55,50,41,20和13 ku.Western blotting结果显示核蛋白与CREB抗体发生了较强的结合反应,在41 ku位置附近出现了清晰的反应条带,推测其可能为柞蚕的CREB蛋白.     

大理市华山松大树移植技术措施

介绍华山松移植的情况及必要性,对大理市华山松大树移植的移植时间、植株选择、移植树木挖掘和包扎、装卸和运输、栽植等一系列技术措施进行了阐述.对栽后的浇水、施肥、管护和病虫害防治等管护措施也作了概述.     

利用新的外植体建立棉花高效转化系统的研究

利用陆地棉 (Gossypium hirsutum cv.Cok-er3 1 2和 G.hirsutum.晋棉 7号 ,冀合 3 2 1 ) 8～1 2 d无菌苗侧根 1 0 mm切段作为新的外植体与农杆菌 L BA440 4 p BK9(3 5 s∶∶ LUC∶∶ Nos)共培养将外源基因导入棉花 ,成功的获得转基因工程植株 ,提高了愈伤组织和转基因工程植株的转化效率。 p BK9质粒上携带的萤光素酶基因 [Lucif-erous(lux) ]为报告基因 (reporter gene) ,新霉素磷酸转移酶基因 (npt II)为选择标记基因 (markergene) ,经选择获得的转基因工程植株通过 VedioImage System进行整株活体萤光素酶基因 (lux)活性表达检测 ,获得 To 代和 T1代萤光素酶基因(lux)阳性表达植株。进行 DNA分子杂交 (South-ern blot)分析 ,证明外源基因已经整合到棉花基因组中。转基因工程植株萤光素酶基因 (lux)和新霉素磷酸转移酶基因 (npt II)在自交后代中得到保持 ,外源基因呈核基因单一位点显性遗传。     

家蚕核型多角体病毒及抗病育种

本文介绍了家蚕核型多角体病毒的发现、性状、复制机制以及对家蚕核型多角体病毒病的防治方法。不同的研究者用不同的材料研究了家蚕对NPV的抵抗性及其遗传规律,得到了不同的结果。我们的研究发现了高抗NPV的家蚕特优种质,探明了家蚕对BmNPV抗性的遗传规律。以306和NB为亲本,组配了近等基因系,筛选了与常染色体上抗NPV基因连锁的RAPD分子标记,并以NB为素材,育成了一批新种质。     

Purification and characterization of a nucleoplasmin-like protein from carp (Cyprinus carpio) eggs

ABSTRACT: Nucleoplasmin, first isolated from Xenopus laevis eggs, promotes nucleosome assembly. Hereby, we have purified a nucleoplasmin-like protein from carp ( Cyprinus carpio ) eggs using ion exchange and subsequent gel filtration columns. The protein was recognized by a polyclonal antiserum against Xenopus laevis nucleoplasmin and had an amino acid composition similar to other member of the nucleoplasmin family proteins. Partial amino acid sequences from the cyanogen bromide (CNBr)-cleaved fragments showed high homology with Xenopus nucleoplasmin. The protein was also found to form an oligomeric complex and to be phosphorylated. Moreover, this protein promoted sperm nuclear decondensation as well as that of nucleoplasmin from Xenopus laevis eggs. These results suggest that the fish protein isolated here is a member of nucleoplasmin family.     

Nuclear scanning with 99mTc-HDP for the initial evaluation of osseous metastasis in canine osteosarcoma

The purpose of this retrospective analysis was to evaluate the use of nuclear scintigraphy in determining the rate of secondary sites of osseous malignancy at initial presentation in dogs with osteosarcoma. Radiographs of suspicious secondary lesions were reviewed and placed into four separate categories: benign lesions; no lesion seen on radiographs; subtle radiographic changes suggestive of, but not conclusive for, metastasis; and metastatic lesions highly suspected on radiographs. Three hundred and ninety‐nine dogs were evaluated by technetium nuclear scanning for suspected osteosarcoma. Three hundred and twenty‐six of 399 dogs (82%) had only one apparent site on the nuclear scan, whereas 72 dogs (18%) had more than one suspicious site on the nuclear scans. Highly suspected secondary metastatic lesions were detected by nuclear scans in 7.8% of cases. Although interpretation of nuclear scans is subjective, this study showed a 7.8% chance of detecting unsuspected osseous metastasis with nuclear scans in canine osteosarcoma patients on initial presentation.