Do bromadiolone treatments to control grassland water voles (Arvicola scherman) affect small mustelid abundance?     

Javier Fernandez‐de‐Simon  Michael Coeurdassier  Geoffroy Couval  Isabelle Fourel  Patrick Giraudoux 《Pest management science》2019,75(4):900-907

  相似文献   

Effect of Kechuanning on airway remodeling and protein level of p-ERK1/2 in lung tissues of asthmatic rats induced by virus     

CHEN Xing-yu  LUO Yin-he  WANG Meng-qing  CHEN Ying-ying  LI Yan  HUANG Kai-ling  SUN Le  DING Yi  SUN Xuan-long 《园艺学报》2019,35(7):1268-1275

AIM:To investigate the effect of Kechuanning on airway remodeling and the protein level of p-ERK1/2 in lung tissues of asthmatic rats induced by virus. METHODS:The asthmatic rat model induced by respiratory syncytial virus was established. The experimental rats were divided into normal group, asthma model group, low dose (0.33 mL/kg), middle dose (3.0 mL/kg) and high dose (10 mL/kg) of Kechuanning groups, and PD98059 (3 mg/kg) group. The airway responsiveness of the rats was measured by animal ventilator. The pathological changes of the lung tissues were observed by HE staining. PAS staining and Masson staining were used to observe goblet epithelial cells metaplasia and airway collagen deposition. The expression of matrix metalloproteinases-9 (MMP-9) and tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) in the lung tissues of the rats was detected by immunohistochemical staining. The protein levels of ERK1/2 and p-ERK1/2 were determined by Western blot. RESULTS:Compared with model group, the airway responsiveness of the rats in middle dose and high dose of Kechuanning groups was significantly decreased (P<0.01), the injury of lung tissues was significantly decreased, the goblet epithelial cells metaplasia and airway collagen deposition were significantly reduced (P<0.01), and the expression of MMP-9 and TIMP-1 in the lung tissues was also significantly decreased (P<0.01). In addition, the protein level of p-ERK1/2 in high dose of Kechuanning group was significantly decreased compared with model group (P<0.01). CONCLUSION:Kechuanning may treat asthma by regulating the expression of p-ERK1/2 in the lung tissues and improving the airway remodeling symptoms of asthmatic rats induced by virus.  相似文献   

陆地棉GRF基因家族的鉴定和生物信息学分析     

张书芹  乐愉  武斐 《分子植物育种》2019,17(12):3817-3824

为了揭示陆地棉生长调控因子(growth-regulating factors, GRF)家族的功能,本研究利用全基因组信息在陆地棉基因组中鉴定了 33个GRF蛋白,并对这些家族成员进行了保守结构域分析、蛋白的基本理化性质分析、进化分析、基因的结构分析、染色体定位、保守基序分析和组织表达模式分析。研究表明,陆地棉GRF均含有QLQ和WRC 2个保守结构域,系统进化分为4个亚家族,基因定位在19条染色体上,基因上有2~19个蛋白编码区域,大多数的基因在柱头、子房和20 d的种子中高量表达。本研究弄清了棉花GRF家族的基本信息,为进一步研究棉花GRF家族成员的功能提供了理论指导。  相似文献   

Vacuum Drying for Extending Litchi Shelf-Life: Vitamin C,Total Phenolics,Texture and Shelf-Life Assessment     

Felipe Richter Reis  Aline Caroline de Oliveira  Gabriella Giani Pieretti Gadelha  Marcela Breves de Abreu  Hillary Isabelle Soares 《Plant foods for human nutrition (Dordrecht, Netherlands)》2017,72(2):120-125

In an attempt to obtain shelf-stable litchi fruit with preserved nutritional quality and good sensory features, quarters of peeled and pitted fruits were vacuum dried at 50, 60 and 70 °C at a constant pressure of 8.0 kPa. The product was assessed for its vitamin C, total phenolics and texture (hardness). In addition, the product with the best texture was assessed for its shelf-life by means of accelerated testing. Results suggest that vacuum dried litchi retained almost 70% of the vitamin C and total phenolics when compared to frozen fruits (control). Vitamin C and phenolic compounds content significantly decreased with drying, while no difference was found between different drying temperatures. Hardness increased with drying temperature. The sample dried at 70 °C presented crispness, which is a desired quality feature in dried fruit products. This sample was subjected to shelf-life evaluation, whose result suggests a shelf-life of eight months at 23 °C. Total color change (CIE ΔE₀₀) was the expiry criterion. Vacuum drying was a suitable technique for producing shelf-stable litchi fruit with good texture while preserving its desirable original nutrients. Consumption of vacuum dried litchi may be beneficial to health due to its remarkable content of phenolic compounds and vitamin C.  相似文献   

星花玉兰新品种‘粉荷’     

马天晓  王艳梅  刘金顶  张一鸣  杨乐  李春朋  胡新权  毕学伟 《园艺学报》2017,44(5):1017-1017

‘粉荷’星花玉兰,成蕾早,花蕾产量高。花期2月中旬至3月下旬,花瓣形如荷花,色泽艳丽,花量大,抗性强,病害少,易管理,观赏价值高。  相似文献   

Conservation planning with spatially explicit models: a case for horseshoe bats in complex mountain landscapes     

Marie Le Roux  Mathilde Redon  Frédéric Archaux  Jed Long  Stéphane Vincent  Sandra Luque 《Landscape Ecology》2017,32(5):1005-1021

  相似文献   

基于智能交流接触器的采摘机器人机械臂设计     

王臻卓  李伟  范乐 《农机化研究》2017,(6):209-213

在充分考虑机械臂伺服电机智能速度检测装置的结构和闭环运动过程控制的基础上,将智能交流接触器引入到了采摘机器人机械臂关节伺服电机的反馈控制中,并建立了PID闭环反馈调节回路,有效地提高了机械臂的控制精度。同时,将智能交流接触器以速度控制函数的形式嵌入到了PID控制环节,采用ADMAS和MatLab软件对机械臂的轨迹控制精度进行了测试,并利用Mat Lab软件计算得到了关节的控制变量,以Spline形式将变量导入到了ADMAS中对机械臂两关节进行控制。通过仿真得到了机械臂关节的输入和输出位移随时间变化曲线和机械臂末端的运动结果,结果表明:输入和输出的位移基本吻合,并且机械臂末端可以按照预定的圆环轨迹运动,从而验证了智能交流接触器PID控制的控制精度。  相似文献   

汉中市小麦条锈病流行的影响因子及预测模型     

张吉昌  王清文  黎钊  李乐  张勇  王保通  王晖  杨建军 《麦类作物学报》2017,(12):1640-1644

为掌握汉中市小麦条锈病流行规律,提高病害测报的科学性和准确性,采用DPS数据处理系统,对多年来汉中市小麦条锈病测报资料进行了主导因素分析,筛选出影响发病程度的主要因子包括小麦感病品种种植比例(x1)、秋苗病田率(x2)、秋苗单位面积平均病叶数(x3)、1月份平均气温(x6)、上年11月份降雨量(x11)、早春病田率(x18)、3月中旬病田率(x19),与发生程度(y)进行逐步回归分析,建立了发病程度预测模型:y=-6.354 7+0.084 0x1+0.022 8x3+0.662 8x6+0.020 9x11,R2=0.968 7。拟合预测符合率为92.31%,相对误差8.96%。利用预测模型对2014-2016年汉中市小麦条锈病进行预测,预测的病级分别为2.93、3.21、1.92,与2014、2015、2016年发生的实际病级3、3、2相吻合。此模型可应用于生产中小麦条锈病的测报。  相似文献   

Comparing mating designs to restore seed production of interspecific hybrids between Trifolium repens (white clover) and Trifolium uniflorum          下载免费PDF全文

Muhammad Naeem  Isabelle Marjorie Verry  Peter D. Kemp  James P. Millner  Warren Mervyn Williams 《Plant Breeding》2017,136(3):420-426

Interspecific hybrids between Trifolium uniflorum and cultivated white clover (Trifolium repens) have highly useful characteristics for temperate pastoral systems derived from both parent species. However, the early hybrids (F₁ and BC₁) also have unacceptably poor seed production for commerce. This study analysed the basis for the poor seed production and investigated breeding strategies for overcoming the problem. The BC₁F₁ generation produced lower‐than‐expected numbers of heads per plant and seeds per floret. Backcrossing of selected hybrids to white clover corrected these deficiencies and created new variation. Seed numbers were also returned to near target levels by recurrent selection within the BC₁ generation. Thus, it was possible to retain a theoretical average of 25% of T. uniflorum genome and still achieve high seed production per plant. The BC₁F₂ and BC₂F₁ generations produced high seed numbers per plant, along with reasonable variation. Both of these second‐generation hybrid forms have high reproductive potential and should be the focus for the selection of the desired combinations of agronomic and seed production traits.  相似文献   

Flavan-3-ols and procyanidins in grape seeds: biodiversity and relationships among wild and cultivated vines     

Mehdi Trad  Carine Le Bourvellec  Hmida Ben Hamda  Catherine M. G. C. Renard  Mounira Harbi 《Euphytica》2017,213(11):242

Flavan-3-ol monomers and polymers composition of seeds from wild (17) and autochthonous (8) Vitis vinifera grapes growing in northern Tunisia were evaluated. Wild grape seeds were spherical with a small beak and relatively a high seed/berry ratio (~ 18.1%w/w). Local cultivars developed pyriform-shaped seeds with a well-developed beak representing on average 2.2% of total weight of the berry. Flavanol concentrations ranged between 40.9 and 67.5 mg/g FW in seeds from wild accessions and between 48.9 and 96.7 mg/g FW in seeds from cultivated grapes. Differences between accessions were highly significant (p < 0.01) and seeds from cultivar ‘Boukhasla’ showed the highest polyphenols content. Among flavan-3-ol monomers, (+)-catechin was predominant for all ecotypes and generally their abundance was: (+)-catechin (Cat) > (?)-epicatechin (Ec) > (?)-epicatechin-3-O-gallate (EcG). The Cat/Ec ratio was approximately 1.7 for wild grapes while it was about 2.5 for cultivated grapes. Procyanidins in wild seeds differed from cultivated ones by a lower mDP and higher proportions of galloylated derivatives, likely to affect fruit bitterness and astringency. (?)-epicatechin was the main extension subunit in grape seed procyanidins, reaching on average 52% in wild and 58% in cultivated seeds. Hierarchical cluster analysis based on seeds morphometry and procyanidin profile indicated close proximity between some wild and cultivated grapes suggesting that some cultivars derived from ancestral events of local domestication or cross hybridization with native wild plants.  相似文献