Avermectins,a novel class of compounds: implications for use in arthropod pest control

对阿维菌素B_2a进行结构优化,在阿维菌素B_2a的C4\     

生姜群体光台特性的研究

利用田间同化箱对生姜的群体光合特性进行了研究。结果表明，生姜群体光合速率（ＣＰｎ）有明显的季节变化和日变化，随着季节的进展ＣＰｎ呈二次曲线型。ＣＰｎ的日变化呈单峰曲线，峰值出现在中午１２时左右。ＣＰｎ的峰值与旺盛生长季节相吻合。在本试验范围内单位土地面积的ＣＰｎ随ＬＡＩ的增加而增加，若以叶面积计算ＣＰｎ则随叶面积指数（ＬＡＩ）的增加而降低。在田间试验条件下ＣＰｎ随光强和ＣＯ２浓度的增加而增加，在自然光下未测到生姜ＣＰｎ的光饱和点。     

Immune responses in piglets infected with highly pathogenic porcine reproductive and respiratory syndrome virus

Porcine reproductive and respiratory syndrome virus (PRRSV) infection compromises the host's innate and adaptive immunity. The aim of this study was to investigate the immune responses of piglets infected with highly pathogenic (HP) PRRSV (HuN4 strain) with or without the immunization with CH-1R attenuated PRRSV vaccine. The response was evaluated for the clinical signs, pathological changes and virus load in immune organs, antibody responses and levels of serum IFN-γ, IL-4 and IL-10. The result showed that in comparison with the piglets received the immunization, the piglets infected with HP-PRRSV alone had the thymus atrophy, decreased serum levels of IL-4 and increased serum levels of IL-10 and INF-γ. These results suggest that elevated IL-10 levels at the early stage of the infection may enhance virus survival and delay the induction of protective immunity, while increased levels of IL-4 induce the effective immune responses and increase the animals' health status.     

油料树种风吹楠播种繁殖试验

对热带油料树种风吹楠的播种繁殖试验结果：风吹楠整个果实土壤播种萌发率高达90.52%,种子土壤和沙床播种萌发率分别为68.75%和64.81%,但整个果实沙床播种萌发率仅为12.64%。整个果实和种子的土壤播种苗都生长良好,生长量无明显差异。     

矢量数据和栅格数据在土地预测中的应用对比——以山西岔口小流域为例

研究目的:为了对比矢量数据和栅格数据在土里利用过程中的差别。研究方法:借助于Super Map2008、MATLAB R2009a、Arc GIS9.2和IDRISI Andes15.0等软件,建立马尔科夫模型,得到转移概率矩阵进行对比分析。研究结果:矢量数据的结果一般更为精确,但软件利用程度低。栅格数据的结果比较而言没有那么精确,但是思路简单,软件利用程度高,结果易得且也能满足预测要求。研究结论:不论是矢量数据还是栅格数据都可以很好地用于土地利用中的预测。     

浅析物联网与智慧林业

物联网是物物相连的互联网,其用途十分广泛,在传统林业向智慧林业的转变过程中起到了不可替代的作用。本文拟对物联网在林业中的资源监测、保护等方面的应用进行分析,以期为物联网在今后智慧林业方面的发展提供技术支持。     

Effects of isorhapontigenin on cell cycle arrest and down-regulation of cyclin D1 expression in bladder cancer cells

AIM：To explore the inhibitory mechanism of isorhapontigenin (ISO) on the proliferation, migration and invasion of UMUC3 bladder cancer cells. METHODS：Human UMUC3 bladder cancer cells were pretreated with ISO, and the proliferation of the cells was observed under phase-contrast microscope and by ATPase assay. The expression of cyclin D1 was determined by RT-PCR and Western blotting. The cell cycle alteration was detected by flow cytometry, and the cell migration was examined by wound-healing assay. RESULTS：Over 20 μmol/L of ISO significantly inhibited the proliferation of UMUC3 cells with the IC50 of (22.5±2.8) μmol/L. The mRNA and protein levels of cyclin D1 in UMUC3 cells were markedly decreased after treatment with ISO. Exposure of UMUC3 cells to low dose (5 μmol/L) of ISO led to significant induction of G0/G1 growth arrest at both 12 h (58.82%) and 24 h (63.94%), compared with the negative control cells (47.33%) without inducing obvious apoptosis. ISO at dose of 5 μmol/L also markedly inhibited the cell migration. CONCLUSION：ISO significantly exhibits inhibitory effects on the proliferation and migration of human bladder cancer cells by down-regulation of cyclin D1 expression accompanying with G0/G1 cell cycle arrest.     

Effects of nitrogen and water stress on the rehydration,endogenous hormonal regulation and yield of maize

Water scarcity is known to be a strong limiting factor affecting maize grown and yield in cold semi-arid regions. Numerous studies have shown that rehydration improves maize growth. Our study aimed to explore the effects of rehydration treatments on maize growth and yield under water and nitrogen stress during different growth stages. We selected the drought-tolerant maize variety Nendan 19 (ND19) and subjected it to water stress during the V6 (sixth-leaf), R2 (filling) and R6 (maturity) growth stages and a rehydration treatment after each stress stage. Our results indicated that N1 (N100 kg N ha⁻¹) and N3 (N300 kg N ha⁻¹) treatments significantly increased the leaf moisture status relative to water content (RWC), bound water content (BWC), free water content (FWC) and water potential (WP)) at different growth stages. Similar trends were observed in the accumulation of plant leaf and root hormones (zeatin+zeatin riboside, indole-3-acetic acid, abscisic acid and gibberellic acid), photosynthetic pigments and chlorophyll fluorescence. However, under the same water stress conditions, they decreased as the N rate increased and reached a minimum value in the S3 (water stress for N3) treatments. In addition, with growth stage advancement and extension of the rehydration time, both showed a gradual upward trend. The results showed that to save water resources in the cold semi-arid region, rehydration treatments (R2S1 and R2S3) significantly increased the photosynthetic pigments and chlorophyll fluorescence parameters, leaf moisture status, biomass, 100-grain weight, hormone content, ear characteristics and grain yield of maize.     

从油橄榄引种看我国木本食用油料产业的发展

为了科学制定木本油料产业发展规划,论述了我国发展木本食用油料产业的优势和特点,分析了橄榄油的营养价值和市场动力,简述了我国油橄榄引种栽培的历史,指出了我国目前木本食用油料产业发展中存在的主要问题,并提出了促进木本食用油料产业发展的对策与措施。