干旱区杨树用材林土壤特性和林木生长对供水的响应

经过4年试验,结果表明,(1)供水对土壤水分调控作用明显,土壤各项含水指标均随供水量的增加而增加;(2)通过灌溉可改善土壤的三相比结构和土壤容重;灌溉对总孔隙度影响不明显;(3)灌溉对地下水位的影响显著,灌水前林地地下水埋深为3.46m,而灌水期内地下水埋深在2.36~2.87m之间,在7500m3/hm2.a灌溉定额以下时,不会造成土地次生盐渍化;(4)不同供水量对林木生长的效应是不同的,随灌溉量增加而造成不同程度的正增长;(5)人工林的蒸腾耗水量随供水量的增加而增加;(6)河套灌区杨树速生丰产林的合理灌溉量为7500m3/hm2.a。     

N-(7-氟-3-氧-3,4-二氢-苯并噁嗪-6-基-)乙酰胺类化合物的合成及除草活性

为了寻找高效、安全的具有除草活性的新化合物,利用2-取代乙酰氯和2H苯并噁嗪-3-酮反应合成了9个N-(7-氟-3-氧-3,4-二氢苯并噁嗪-6-基-)乙酰胺类化合物,其结构经元素分析、IR、1H NMR确证。初步除草活性测试表明:在有效剂量75 g/hm2下,化合物 5d 芽后茎叶处理对刺苋Amaranthus spinosus等4种杂草显示出90%以上的抑制率。     

Study on the immunological function of sodium butyrate-induced immature human monocyte-derived dendritic cells

AIM: To investigate the immunological function of sodium butyrate-induced immature dendritic cells in vitro.METHODS: The human monocyte-derived dendritic cells were induced in the presence of human granulocyte macrophage-colony stimulating factor(GM-CSF) and interleukin-4 (IL-4), combined with sodium butyrate. The immunological function of sodium butyrate-induced dendritic cells was detected by the FCM, endocytic activity, T cells stimulatory proliferation capacity, and interleukin-12 (IL-12) production.RESULTS: Sodium butyrate could down-regulate the major histocompatibility complex(MHC) class II and costimulatory molecules of dendritic cells, increase the endocytic activity, induce a stage of T-cell anergey, and inhibit the T helper cell type 1-skewing factor IL-12 production. CONCLUSION: Sodium butyrate inhibits the maturation of dendritic cells and induces production of immature dendritic cells, which may help to explore the machenism of its epigenitic modification.     

华北落叶松木质与树皮材积比率和胸径关系的探讨

<正>林业用材林生产往往需要培育木质材积比率高、树皮材积比率低的林木,以达到速生、丰产、优质的目的。在对林木材积影响的因子中,胸径是主要指标之一,笔者以华北落叶松为研究对象来探讨木质与树皮材积比率和胸径的关系。     

优良观赏保健树大叶冬青扩繁利用研究

在引进大叶冬青树种种质资源的基础上,系统地研究了大叶冬青生物学特性、生态适应性、生长习性、实生种播苗关键技术和组织培养及其微繁技术,以及生态复合拟生栽培技术,培育出了大叶冬青绿化苗木18万株。并测定了大叶冬青叶内可溶性蛋白质、超氧化物歧化酶(SOD)等抗衰老成分含量和叶组织中抗菌成分含量及其抑菌功能。因地制宜研制出优质嫩芽型、嫩叶炒青型、老叶微波干燥型3种苦丁保健绿茶,为大叶冬青叶资源产业化开发奠定了基础。     

蔷薇科植物上5种锈菌的形态学特征

通过对采集到的病害标本作形态学比较,并对照有关资料,鉴定出寄生于南京地区蔷薇科植物的多孢锈菌属锈菌5个种,即:短尖多孢锈菌Phragm idium mucronatum(Pers.)Schlechtendal,蔷薇多孢锈菌P.rosae-multi-floraeD ietel.,山田多孢锈菌P.yamadanumH iratsukaf.,玫瑰多孢锈菌P.rosae-rugosaeKasai和少隔多孢锈菌P.pauciloculare(D ietel.)H.et P.Sydow。进而对这5种锈菌的形态学特征作了详尽的描述。     

仙客来播种育苗试验

将仙客来种子用高锰酸钾质量分数1000×10 6液浸泡26h左右,进行种皮软化和消毒处理,然后播种在泥炭基质内,深度为(0 6±0 1)cm。在无光条件下保持温度(20±5)℃,湿度90%左右,在50～60d后即可发芽。发芽后应注意增加光照和施肥,也可以用稀释的肥料代替喷水,成苗率达89 9%。     

德钦县旅游业发展研究

德钦县位于云南省迪庆州西北部，国土面积7504km^2，人口58300人，国内生产总值9094万元，是国家级贫困县。由于历史的原因，社会经济发展滞后。天保工程实施后，“木头财政”受到极大的冲击，因此必须进行产业结构调整，培育新的经济增长点，其重要内容是发展旅游业。德钦县具有发展旅游业的丰富资源，发展旅游业是产业结构调整的需要，是培育其他支柱产业和环境保护的需要。对发展旅游业的前景进行了市场分析和预测，分析了目前存在的问题，提出了今后发展的建议。     

Mdivi-1, mitochondrial fission inhibitor,impairs developmental competence and mitochondrial function of embryos and cells in pigs

Mitochondria are highly dynamic organelles that undergo constant fusion/fission as well as activities orchestrated by large dynamin-related GTPases. These dynamic mitochondrial processes influence mitochondrial morphology, size and function. Therefore, this study was conducted to evaluate the effects of mitochondrial fission inhibitor, mdivi-1, on developmental competence and mitochondrial function of porcine embryos and primary cells. Presumptive porcine embryos were cultured in PZM-3 medium supplemented with mdivi-1 (0, 10 and 50 μM) for 6 days. Porcine fibroblast cells were cultured in growth medium with mdivi-1 (0 and 50 μM) for 2 days. Our results showed that the rate of blastocyst production and cell growth in the mdivi-1 (50 μM) treated group was lower than that of the control group (P < 0.05). Moreover, loss of mitochondrial membrane potential in the mdivi-1 (50 μM) treated group was increased relative to the control group (P < 0.05). Subsequent evaluation revealed that the intracellular levels of reactive oxygen species (ROS) and the apoptotic index were increased by mdivi-1 (50 μM) treatment (P < 0.05). Finally, the expression of mitochondrial fission-related protein (Drp 1) was lower in the embryos and cells in the mdivi-1-treated group than the control group. Taken together, these results indicate that mdivi-1 treatment may inhibit developmental competence and mitochondrial function in porcine embryos and primary cells.