The role of nitric oxide in cancer

Nitric oxide (NO) is a pleiotropic regulator, critical to numerous biological processes, including va-sodilatation, neurotransmission and macrophage-mediated immunity. The family of nitric oxide synthases (NOS) comprises inducible NOS (iNOS), endothelial NOS (eNOS), and neuronal NOS (nNOS). Interestingly, various studies have shown that all three isoforms can be involved in promoting or inhibiting the etiology of cancer. NOS activity has been detected in tumour cells of various histogenetic origins and has been associated with tumour grade, proliferation rate and expression of important signaling components associated with cancer development such as the oestrogen receptor. It appears that high levels of NOS expression (for example, generated by activated macrophages) may be cytostatic or cytotoxic for tumor cells, whereas low level activity can have the opposite effect and promote tumour growth. Paradoxically therefore, NO (and related reactive nitrogen species) may have both genotoxic and angiogenic pro     

Proteomic analysis of changes in protein expression in liver mitochondria in apoE knockout mice

The involvement of both apolipoprotein E (apoE) and mitochondria in lipid metabolism is widely recognized, however there is surprisingly scarce data about the putative mitochondrial action(s) of this protein. The aim of the study was to screen the alterations in liver mitochondrial proteome caused by apoE deficiency. We applied 2DE-LC-MS/MS methodology to investigate the changes in liver mitochondrial protein expression in 6-months old apoE(-/-) mice as compared to C57BL/6J controls. ApoE(-/-), but not C57BL/6J mice developed visible atherosclerotic changes in aorta and mild, diffuse steatosis of the liver. Collectively, 18 differentially expressed proteins were identified in mitochondria, related to apoptosis, antioxidant and detoxifying mechanisms of mitochondria, as well as lipid metabolism and transport. In conclusion, differential proteomic approach revealed several lines of proteomic evidence that mitochondrial function in the liver of apoE(-/-) mice could be altered as a result of overlapping of pathological and compensatory changes in expression of proteins.     

应用电激法在大肠杆菌中导入外源性DNA

本文报道用国产基因导科脉冲仪(LN－101型),采用高压脉冲电场,将质粒DNA和噬菌体DNA成功地转化或转导人大肠杆菌。该电场单次电压脉冲范围1．Okv一2．5kv(初电场强度2,8kV／cm一16kV／cm)、电容范围5—20μF,用质粒pUC18和受体菌株DH5α,获得10　9－10　10转化子／μgDNA。电场强度、电容及脉冲时间等不同的因素影响转化效率。转化率与DNA的强度呈线性关系,与受体细胞密度成正比。 DNA和受体菌混合物在电激前,后的孵育时间,对转化效率影响不明显。用噬菌体M13mp 19 RF及受体菌株JMl09,同样可获得较高的转化效率。     

非布司他对痛风合并高尿酸血症患者血清sICAM-1, ET-1 及尿酸水平的影响

目的:探讨非布司他对痛风合并高尿酸血症患者血清内皮素-1(ET-1)、细胞间粘附分子-1(ICAM-1)及尿酸水平的影响。方法:收集在我院就诊或住院治疗的80例痛风合并高尿酸血症患者,随机分为实验组和对照组,每组40例。对照组患者给予别嘌呤醇片治疗;实验组患者给予非布司他片治疗。观察并比较两组患者治疗前后血尿酸、s ICAM-1、ET-1水平及临床疗效。结果:与治疗前相比,两组患者治疗后的血尿酸、s ICAM-1、ET-1水平均显著降低(P0.05);与对照组相比,实验组患者的血尿酸、s ICAM-1、ET-1水平较低(P0.05),临床治疗总有效率较高(P0.05)。结论:非布司他能够降低痛风合并高尿酸血症的s ICAM-1、ET-1及尿酸水平,且临床疗效较好。     

舍蝇发育起点及有效积温常数的研究

<正> 舍蝇Musca domestica vicina是绝大多数地区的优势蝇种,与人类关系极为密切,对人为害亦严重。为了更好地防治为其预测预报提供科学依据,作者对舍蝇的发育起点和有效积温常数进行了测定,其结果如下。 一、观察及测定方法 1.饲养与观察 1982年6月至11月在自然变温情况下采用500毫升普通玻璃罐头瓶为饲养容器,内盛200克常用幼虫饲料,连续饲养舍蝇 首次接种的舍蝇卵采自本站饲养室舍蝇     

БРАХИОПОДЫ ДЕВОНА СЕВЕРО-ВОСТОЧНОΓО КИТАЯ

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НАУТИЛОИДЕИ НИЖНЕГО ОРДОВИКА ИЗ РАЙОНА ЦЗОЦЗЫШАНВ ИКЗЧЖАОМЗНЬ ВНУТРЕННЕГО МОНГОЛИИ

Polydesmia zuezshanensis Chang (sp.nov.)(CD74)Polydesmia yilehetoensis Chang (sp.nov.)(CD74)Polydesmia sp.A (CD74)Polydesmia sp.B (CD73A)Polydesmia sp.C (CD73B)Ordosoceras sphaeroiforme Chang (gen.et sp.nov.),(CD74A)Ordosoceras quasilineatum Chang (gen.et sp.nov.)(CD74B)Ordosoceras sp.(CD74B)Ormoceras sp.A (CD74)Ormoceras sp.B (CD74D)Ormoceras(?) sp.(CD74C)Endoceras sp.(CD74)Cameroceras sp.(CD74)Vaginoceras undulatum Chang (sp,nov.)(CD74D)Vaginoceras sp.(CD74D)Polygrammoceras sp.(CD74D)Polygrammoceras(?) sp.(CD74D)Michelinoceras sp.A (CD74D)     

以豆腐柴叶为原料提取果胶工艺研究

本文开发了一条从豆腐柴叶中提取果胶的新工艺。该工艺中,树脂吸附纯化、超滤浓缩和喷雾干燥是三个重要的单元操作。为了确定最佳提取条件和考察树脂吸附纯化和超滤浓缩两个单元操作的商业应用可行性,进行了三种不同规模的试验。结果表明,所开发的工艺在能耗和果胶质量方面明显优于传统的醇沉淀法。