N-(α-萘乙酰基)-N-′(2-丙酸基)-硫脲的合成     

赵增兵  时蕾 《安徽农业科学》2008,36(35)

研究了从α-萘乙酸出发,用一锅法合成出N-(α-萘乙酰基)-N-′(2-丙酸基)-硫脲。首先,α-萘乙酸与氯化亚砜反应生成α-萘乙酰氯,然后,再加入硫氰酸钾,并在乙腈为溶剂的条件下,合成α-萘乙酰基硫氰酸酯,最后,再与丙氨酸反应,生成目标产物。所得产物结构经IR初步确证。  相似文献   

(甜)玉米澄清汁饮料加工工艺的研究   总被引：1，自引：0，他引：1  

陈俊  陈芳 《农产品加工．学刊》2007,(6):50-51,54

以甜玉米为原料,经提取玉米汁液,添加调配白砂糖和柠檬酸等,对甜玉米饮料的加工工艺(酶解,澄清)进行研究,研制出一种口味纯正的天然饮品。  相似文献   

东北地区小麦赤霉病镰孢菌种群及其致病性测定   总被引：1，自引：0，他引：1  

潘晓静  陈楠  姚远  刘限  高增贵 《华北农学报》2015,(3)

为了明确东北地区小麦赤霉病镰孢菌的种群组成及分布,分别从辽宁省沈阳市、黑龙江省哈尔滨市和密山市、内蒙古自治区扎兰屯市、呼伦贝尔市和通辽市等地区采集小麦赤霉病病样,经单孢分离纯化共得到118株镰孢菌,传统形态学鉴定的基础上,采用基因组DNA的EF-1α序列分析技术进行了镰孢菌种类的辅助鉴定,确定属于7个种:禾谷镰孢菌为优势种,分离频率为64.41%,藤仓镰孢菌为次优势种,分离频率为18.64%;燕麦镰孢菌、尖孢镰孢菌、木贼镰孢菌、锐顶镰孢菌和轮枝镰孢菌的分离频率分别为5.08%,3.39%,3.39%,3.39%,1.70%。同时,在玉米成株期进行了致病性测定,结果表明,小麦赤霉病镰孢菌可以侵染玉米,较玉米茎腐镰孢菌的致病力低。  相似文献   

Cmponent Study on Flavonoids From Leaves of Dendrocalamus Latiflorus   总被引：5，自引：0，他引：5  

唐浩国  郑卫东  陈宗道 《中国农学通报》2005,21(4):114-114

从麻竹（Dendrocalamus latiflorus）叶中分离得到四个黄酮类化合物。经性质和光谱（UV,IR,MS,1HNMR,13CNMR等）法鉴定其结构,分别为牡荆苷（?）,芦丁（II）,山奈酚-3-O-β-D-芸香糖苷（III）,山奈酚-3-O-β-D-葡萄糖基(1-2)-α-L-鼠李糖苷（IV）。四种化合物均为首次从该植物中得到。  相似文献   

Three new water-soluble alkaloids from the leaves of Suregada glomerulata (Blume) Baill     

Yan RY  Wang HQ  Liu C  Chen RY  Yu DQ 《Fitoterapia》2011,82(2):247-250

Three new water-soluble alkaloids (1-3) together with twelve known compounds (4-15) have been isolated from the water extract of leaves of Suregada glomerulata. Their structures were determined by spectroscopic analysis and chemical method. Compounds 1-3 were evaluated for their in vitro inhibitory activity against α-glucosidase and HIV-1 replication. However, no significant activities were found.  相似文献   

Enhancing the Simplified Surface Energy Balance (SSEB) approach for estimating landscape ET: Validation with the METRIC model     

G.B. Senay 《Agricultural Water Management》2011,98(4):606-618

Evapotranspiration (ET) can be derived from satellite data using surface energy balance principles. METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration) is one of the most widely used models available in the literature to estimate ET from satellite imagery. The Simplified Surface Energy Balance (SSEB) model is much easier and less expensive to implement. The main purpose of this research was to present an enhanced version of the Simplified Surface Energy Balance (SSEB) model and to evaluate its performance using the established METRIC model. In this study, SSEB and METRIC ET fractions were compared using 7 Landsat images acquired for south central Idaho during the 2003 growing season. The enhanced SSEB model compared well with the METRIC model output exhibiting an r² improvement from 0.83 to 0.90 in less complex topography (elevation less than 2000 m) and with an improvement of r² from 0.27 to 0.38 in more complex (mountain) areas with elevation greater than 2000 m. Independent evaluation showed that both models exhibited higher variation in complex topographic regions, although more with SSEB than with METRIC. The higher ET fraction variation in the complex mountainous regions highlighted the difficulty of capturing the radiation and heat transfer physics on steep slopes having variable aspect with the simple index model, and the need to conduct more research. However, the temporal consistency of the results suggests that the SSEB model can be used on a wide range of elevation (more successfully up 2000 m) to detect anomalies in space and time for water resources management and monitoring such as for drought early warning systems in data scarce regions. SSEB has a potential for operational agro-hydrologic applications to estimate ET with inputs of surface temperature, NDVI, DEM and reference ET.  相似文献   

野生二粒小麦α-淀粉酶抑制因子编码基因序列分析     

江斌  王际睿  魏育明  颜泽洪  郑有良 《四川农业大学学报》2006,24(3):247-251

对3份野生二粒小麦(Triticum dicoccoides)材料的抗虫24 kDaα-淀粉酶抑制因子编码基因进行分离克隆,得到72个24 kDaα-淀粉酶抑制因子基因,并进行序列分析。结果发现,α-淀粉酶抑制因子在野生二粒小麦中以多拷贝形式存在,经卡方检验初步推断野生二粒小麦中的α-淀粉酶抑制因子成熟蛋白编码基因序列变异类型在供试材料间无显著差异。序列分析表明,24 kDaα-淀粉酶抑制因子成熟蛋白编码基因序列无论在野生二粒小麦种内还是与小麦属的其他物种之间,都具有很高的一致性,说明该基因在进化过程中十分保守。  相似文献   

甘肃滩羊血清酯酶和α-淀粉酶多态性分析   总被引：3，自引：0，他引：3  

李积友  李秉诚  刘霞  折富有  武广善  宋祖才  田世雄  赵承银 《甘肃农业大学学报》2001,36(4):369-373

运用聚丙烯酰胺凝胶电泳技术(PAGE)对甘肃滩羊产区皋兰、景泰及靖远3293只滩羊的血清酯酶(Es)、α-淀粉酶(α-Amy)基因座多态性进行了检测分析。结果表明:甘肃滩羊Es基因座存在3种基因型Es++ 、 Es+- 、 Es-- ,它们由Es+、Es-两个共显性等位基因控制,其中Es+-基因型在3个群体中均占优势,频率分别为0.620 0(皋兰)、0.666 6(景泰)、0.730 0(靖远);在皋兰群体和景泰群体中,Es-基因占优势,基因频率分别为0.540 0和0.548 4,而在靖远群体中优势基因则为Es+,其基因频率为0.525 0。在α-Amy基因座上没有检测到多态性。  相似文献   

松节油微波加热水合反应制松油醇   总被引：6，自引：0，他引：6  

李艳琳  韦藤幼 《福建林学院学报》2003,23(4):335-337

以HAc为催化剂,在微波加热条件下,对松节油直接水合制松节醇进行研究.结果表明:微波加热较传统加热更能促进反应的进行;在优化反应条件下,直接将松节油于85℃水合反应5h,其转化率达85.91%,选择性为0.453.  相似文献   

甘蔗不同品种(种)个体发育过程中叶片淀粉酶活性的变化     

郑德森 《福建农林大学学报(自然科学版)》1990,(3)

甘蔗品种(种)叶片α-淀粉酶活性变化的基因型效应较大,12个供试材料间的差异明显,种间的差异大于品种间的差异,在个体发育过程中变化幅度较小。β-淀粉酶的活性变化与生长发育的关系较为密切,其变化呈典型的单峰曲线,活性的最高峰出现在甘蔗的旺长时期。几乎所有供试材料酶活性变化趋势是一致的,但变化幅度有差异。分蘖末期至伸长初期,同一材料的β-淀粉酶活性通常高于α-淀粉酶。  相似文献