Expression of DNA repair gene ERCC1 and its relationship with PAH-DNA adducts in lung cancer tissues     

WANG Yun-nan  LV Jia-chun  ZENG Bo-hang  BIN Xiao-nong 《园艺学报》2004,20(7):1153-1156

AIM: To investigate the expression of nucleotide excision repair gene ERCC1 and its relationship with PAH (polycyclic aromatic hydrocarbons)-DNA adducts in lung cancer tissues. METHODS: ERCC1 mRNA expression and the PAH-induced DNA adducts were detected in 150 lung cancer tissues, 120 adjacent lung tissues without cancer cells, 40 benign lung lesions and 40 normal lung tissues. The effects of some exposure factors on the expression of ERCC1 gene and the connection between ERCC1 and PAH-DNA adduct was analyzed. RESULTS: Reduced expression levels of ERCC1 were observed in 46 of 150 (30.7%) lung cancer specimens and 1 of 40 (2.5%) normal lung tissues. Smoking may suppress the expression of ERCC1 gene. The level of PAH-DNA adduct was negatively correlated with the expression of ERCC1 gene, the Spearman coefficient was -0.648, P<0.01. CONCLUSION: ERCC1 is an important nucleotide excision repair gene and may participate in the repair of DNA damage, such as PAH-DNA adduct. Low expression of ERCC1 may play an important role in the development of human lung cancer.  相似文献   

华北农牧交错带退化草地土壤种子库动态变化   总被引：4，自引：4，他引：4  

邵新庆  王堃  吕进英 《草业科学》2005,22(11):8-12

对华北农牧交错带不同退化演替阶段土壤种子库的数量和物种组成及与地上植被的关系进行了初步的研究,结果表明:农牧交错带草地在刈割和放牧等干扰下,发生逆行演替,土壤种子库中植物种类及种子数量呈递减的趋势,轻度退化类型土壤种子库物种组成最高,有23种植物,种子数量最多,有4 303粒,禾本科所占比例较大,为32.3%;而极度退化草地物种组成最低,有14种植物,种子数量仅有1 156粒,禾本科只占8.4%.草地逆行演替过程中植被与土壤种子库在物种组成上存在一定差别,中度退化阶段差别最大,有18种植物未在种子库中出现,极度退化阶段差别最小,有2种未在种子库中出现.  相似文献   

广西5种人工林地土壤微生物数量及土壤酶活性分析     

王冠玉  吕世凡  吕成群  梁朝旭  李鸣 《河北农业大学学报》2017,40(1)

为当地珍贵速生树种人工林的发展及合理利用提供理论依据。分析广西5种珍贵树种人工林土壤微生物数量及土壤酶活性差异,以相同立地条件下12年生的黑木相思(Acacia melanoxylon)、老排(Mytilaria laosensis)、红椎(Castanopsis hystrix)、黧蒴椎(Castanopsis fissa)和火力楠(Michelia macelurei)人工纯林为研究对象,采用稀释平板涂布法和土壤酶活性测定法,测定和分析该5种人工林地土壤微生物数量及酶活性。结果表明:5种林地的土壤微生物总数和细菌数量大小均为:火力楠黧蒴锥红椎黑木相思米老排。但5种林地的土壤酶活性大小不一,蔗糖酶、脲酶、蛋白酶、酸性磷酸酶活性在5种林地之间的差异极其显著,而过氧化氢酶活性不显著。5种林地中土壤酶活性相对较强的是米老排人工林,较弱的是黑木相思林和火力楠林。土壤酶活性与微生物数量的相关分析表明,土壤中蔗糖酶活性与放线菌数量呈极显著正相关关系,其余相关性没有达到显著水平。  相似文献   

我国绿系蜂胶的探讨     

吕泽田 《蜜蜂杂志》2011,31(5):17-19

绿系蜂胶的概念主要来自巴西蜂胶。近些年来，我国出现的大炒巴西蜂胶的现象源于对巴西蜂胶狭隘和浅薄的认识及商业利益的驱动。我们通过赴巴西对巴西蜂胶及相关情况的实地考察，引发了我们对以巴西蜂胶为代表的绿系蜂胶的探讨。  相似文献   

Evaluation on Tolerance of Montmorillonite as a Mycotoxin Adsorbent     

LIU Shao-wen  BAI Xue  CHENG Chuan-min  GUO Chun-hua  XIAO Ying  LV Na 《中国畜牧兽医》2015,42(6):1449-1457

In order to study the tolerance dose of Kunming mice to montmorillonite as a mycotoxin adsorbent in diets,the experiment selected 60 healthy male Kunming mice with initial average body weight of (17±0.12)g,randomly divided them into 5 treatments with two replicates per group and 6 mice per replicate.Five experimental diets were added to 0 (control group),0.5%,1%,2% and 5% montmorillonite,respectively.After 30 days,the growth performance,nutrients apparent digestibility,serum biochemical indices and internal organization were tested to determine the tolerance dose of montmorillonite for Kunming mice.The results showed that the ADFI was significantly increased in 0.5% group (P< 0.05),while there were no significant differences in ADFI and ADG between 1% group and control group (P> 0.05),then the ADFI was significantly decreased with the increasing of montmorillonite supplemental level (P< 0.05).The ADG in 2% group had no significant difference when compared with the control group (P> 0.05),while significantly lower than that in 0.5% and 1% groups (P< 0.05).The apparent digestibility of DM,CP and EE showed no significant effect at any level of montmorillonite (P> 0.05).Serum ALT,AST activities and MDA content were gradually increased with the montmorillonite supplemental level increasing,and that in 1%,2% and 5% groups were significantly higher than that in control group (P< 0.05),but there were no significant differences between 0.5% group and control group (P> 0.05).Tissue sections showed that mice livers were damaged in varying degrees when the montmorillonite supplemental level was 5%.In conclusion,based on a comprehensive consideration of all indexes,it could be seen that the tolerance dose of the tested montmorillonite for Kunming mice was between 0.5% and 2% when mycotoxin contents in diets were in security range.  相似文献   

桑园施沼液好处多     

吕美坤  金伟峰 《蚕桑通报》2011,42(1):20-21

随着各地新农村建设不断深入开展,农村旧村改造以及城镇旧城改造进一步扩大,农民人居环境得到了不断改善,从事畜禽生产的农户急剧减少,并逐渐向专业大户养殖发展。农户在种植土地上施用农家肥也越来越少,  相似文献   

产甲壳素酶菌株的筛选与诱变     

夏祥  吕梦圆  罗玲  蔡俊  胡瑛 《湖北农业科学》2015,54(5)

以胶体甲壳素作为惟一碳源,从自然界微生物中筛选并诱导到一株产甲壳素酶活性较高的菌株,经16S r DNA鉴定为Aeromonas sp.。并以该菌株作为出发菌株,经过一次紫外诱变,酶活是初筛菌株的1.48倍。再经过二次紫外诱变或者紫外-Li Cl复合诱变,酶活分别是初筛菌株的3.16和3.87倍,最高酶活达到3.48 U/m L。最后通过连续传代培养,确定了菌株HMX-16经过紫外和复合诱变后突变性状稳定性良好。  相似文献   

国家经济安全审计实施路径研究     

曹越  吕亦梅  伍中信 《湖南农业大学学报(自然科学版)》2015,(2):83-88

国家经济安全审计是指审计机关依赖有效的审计制度对被审单位财政、财务收支和经济活动的真实性、合法性和效益性进行审计的基础上，针对经济安全的关键领域，识别、评估、预警和报告危害经济安全的风险，确保财产权益安全完整的一种审计模式。该模式奠定了审计监督在国家经济安全体系中的基础性地位。创新审计模式及审计策略、变革国家审计体制、构建以审计监督为基础的新型国家经济安全体系是国家经济安全审计的三大实施路径。  相似文献   

Preparation of Adjuvant Diluent for Live Vaccine against Classical Swine Fever and Evaluation of its Immune Effects     

LIANG Kong-xian  LV Xiao-jun  DING Dan  XU Qi  ZHOU Jie  LIU Wei 《中国畜牧兽医》2015,42(9):2467-2473

The aim of this study was to develop a novel oil-in-water (O/W) emulsion as adjuvant diluents (AD) for live vaccine against classical swine fever (CSF) that could effectively enhance the immune effect of vaccine.The AD was prepared by high-pressure homogenization technique.Formulations and preparation parameters were optimized with response surface design.Its stability, particle size, polydispersity (PDI) and Zeta potential were characterized.The humoral immune response and cellular immune response of the AD were evaluated with BALB/c mice by intramuscular injection.The particle size of the AD prepared by optimized formulation and parameters was 100.4 nm, PDI was 0.147, and Zeta potential was —28.7 mV.The experiment results showed that the AD had good stability.The AD was inoculated combined with live vaccine against CSF into BALB/c mice by intramuscular injection.The results showed that the live vaccine against CSF specific immune responses could be evoked in mice by co-inoculation with AD and vaccine.The cellular immune response levels in co-inoculated groups were significantly higher than control group (P<0.05), with obvious phenomena of higher levels of IFN-γ, IL-6 and IL-4 in serum.The result revealed that cellular immune capability significantly improved with the AD.The results strongly revealed that cellular immune capability significantly improved by introducing AD for effective immune-adjuvant for live vaccine against CSF.  相似文献   

斑茅纤维降解生产燃料酒精的发酵工艺研究     

张树河  甘礼惠  李海明  李和平  潘世明  龙敏南 《福建农业学报》2017,32(5)

以能源植物斑茅纤维为原料,探讨纤维素糖化液生产燃料酒精的发酵工艺研究,分析了时间、温度、pH、氮源种类、酵母膏用量与酵母用量等因素对斑茅纤维素酒精发酵的影响。结果表明:反应时间72~96h,温度35℃,pH4.8~5.2,酵母膏氮源用量0.8%~1.0%,酵母用量10%~15%时斑茅纤维糖化液的酒精发酵效果最好。通过正交试验确定了最佳发酵条件:时间84h、温度35℃、酵母膏用量1.2%、酵母用量20%,发酵验证酒精值达4.6%(V/V),酒精得率32.62%。  相似文献