ANUDEM-专业化数字高程模型插值算法及其特点   总被引：22，自引：0，他引：22  

杨勤科  Tim R．Mcvicar  李领涛  Tom G．Van Niel  张彩霞 《干旱地区农业研究》2006,24(3):36-41

基于已有地形图的数字化方式,通过内插方法建立数字高程模型,是迄今为止最为成熟和简单易行的DEM建立方法。ANUDEM是利用等高线、高程点和河流等数据插值建立DEM的专业化软件。该软件的基本算法由插值、数据平滑、地形强化等组成。软件具有自动诊断数据错误,客观地确定适应于插值基础数据精度的分辨率等特点,用其建立的DEM能正确反映地面水文地貌特征。初步应用研究表明,ANUDEM可应用于黄土高原并建立水文地貌关系正确的DEM,其质量较现有基于TIN方法建立的DEM有明显提高,能更好地描述地面的起伏和水文地貌关系。  相似文献   

脂多糖与β葡聚糖对迟钝爱德华氏菌亚单位疫苗的免疫促进效果研究     

刁菁叶海斌  于晓清许拉 樊英李天保  王淑君王娟 《中国农学通报》2014,30(5):46-52

为了研究脂多糖与β葡聚糖的协同免疫促进效果,本论文重组表达了迟钝爱德华氏菌的一个高效亚单位疫苗候选蛋白甘油醛-3-磷酸脱氢酶（GAPDH）,利用纯化的重组GAPDH（rGAPDH）蛋白单独或混合脂多糖和β葡聚糖免疫牙鲆,免疫后通过检测牙鲆抗体水平、免疫相关基因表达及免疫保护力三方面指标变化对脂多糖和酵母β葡聚糖的免疫促进效果进行研究。酶联免疫吸附试验（ELISA）检测结果显示,脂多糖和β葡聚糖与rGAPDH蛋白共免疫组牙鲆的抗体效价在免疫后第14和30天均显著高于单独免疫rGAPDH蛋白的牙鲆,在第30天时其效价为211.76;荧光定量PCR检测结果显示,相比PBS对照组,牙鲆在注射免疫后脾脏组织中IL-1β、IL-6、MHC-IIα、IgM、TCRα及C型溶菌酶6种免疫相关基因表达量均出现不同程度的上调,而其中脂多糖和β葡聚糖与rGAPDH蛋白共免疫组牙鲆在免疫后多个时间点其基因表达水平均显著高于单独免疫rGAPDH蛋白的牙鲆;免疫保护性实验结果同样显示,脂多糖和β葡聚糖与rGAPDH蛋白共免疫组牙鲆在攻毒后累计死亡率显著低于对照组和单独免疫rGAPDH蛋白组,直至第14天累计死亡率为30%,相对免疫保护率为68%。研究表明,脂多糖和β葡聚糖作为疫苗免疫刺激剂使用可显著增强牙鲆的免疫应答水平,提升亚单位疫苗的免疫效果。  相似文献   

A Comparison of Tree Rings and Peat Deposit Geochemical Archives in the Vicinity of a Lead Smelter     

Martin Mihaljevič  Milan Zuna  Vojtěch Ettler  Vladislav Chrastný  Ondřej Šebek  Ladislav Strnad  Tomáš Kyncl 《Water, air, and soil pollution》2008,188(1-4):311-321

The content of Pb, Cd, Mn, K, Ca, Mg and ²⁰⁶Pb/²⁰⁷Pb isotope ratios in spruce tree rings (Picea abies) and peat cores from the Brdy Hills area (10 km W of the Pb smelter) were compared with those in spruce tree rings in the vicinity of the Pb smelter. Maximum Pb content in tree rings (up to 60 mg kg^?1 Pb) corresponds to a peak of metallurgical production in the mid 1970s and highest smelter emissions in the early 1970s. The Pb concentration curves obtained from peat deposit profiles closely correlate with the Pb concentrations in tree rings at both sampling sites. The small differences between the individual tree cores, with the identical general trend, may be attributed to the difference in distance from the smelter and the altitude of each sampling site. Similar behaviour to Pb can be observed for Cd and Ca. Lead isotope composition in tree rings (²⁰⁶Pb/²⁰⁷Pb ~1.143–1.174) is controlled mainly by the smelter emissions (²⁰⁶Pb/²⁰⁷Pb ~1.16–1.17), with the exception of the youngest segments from the more distant locality from the smelter, which yield isotopic signatures corresponding to car-emission Pb (²⁰⁶Pb/²⁰⁷Pb ~1.143–1.150). Higher content of Mn, Mg and Ca in tree rings corresponding to the 1970s and 1980s may be related to soil chemistry changes caused by acid deposition. In addition, an increase in K, Mg (and in some cases also Mn) in the youngest part of wood cores corresponds to the physiological processes in sapwood, and may be influenced by a decrease in Pb in organic soil horizons, which limited the cycling of basic inorganic nutrients.  相似文献   

伊维菌素泼背剂对牦牛寄生虫的驱除效果试验   总被引：2，自引：0，他引：2  

拉环  蔡进忠  李春花  孙延生 《中国牛业科学》2007,33(5):41-43,46

为选择适应于高寒牧区放牧牦牛大群驱除体内外寄生虫的理想荆型,在青海大通种牛场通过粪检选60头牦牛,随机分为3组,每组20头,试验1组用伊维菌素泼背荆接0.5 mg/kg体重剂量经背部皮肤浇泼给药,试验2组用伊维菌素注射剂按0.2 mg/kg体重剂量经皮下注射给药,试验3组为空白对照组.分析了三组不同寄生虫卵转率、虫卵减少率及驱虫率指标的变化,同时对药物的安全性进行了观察.结果试验1组消化道线虫虫卵转阴率、减少率分别为90%和99.1%,原圆科线虫幼虫转阴率、减少率分别为80%和92.8%;线虫成虫、寄生阶段幼虫的总计驱虫率分别为99.3%和98.8%;试验2组相应指标分别为90%和98.7%、80%和92.9%、99.4%和99.2%;1.2组对牛颚虱杀虫率均达100%,但对莫尼茨绦虫无效,对照组体内外寄生虫均无明显变化.表明伊维菌素泼背剂0.5 mg/kg剂量安全,驱虫效果可信,可在青海高寒地区牦牛体内外寄生虫驱虫工作中推广应用.  相似文献   

主要饲料原料对颗粒饲料颗粒质量的作用     

Tom Winowiski  石永峰 《国外畜牧学(猪与禽)》2007,27(1):10-13

通常能满足营养需求的最低成本配方技术会规定饲料产品的原料选择,因而也限制了变更饲料原料。但是,对颗粒饲料而言,占饲料组成不到1%的原料发生了变动,通常会导致颗粒饲料的物理性状产生显著的差异。选用的磷原料、制粒过程中脂肪的添加时间和使用的制粒辅助剂或制粒粘合剂,所  相似文献   

Briarane Diterpenoids from the Gorgonian Dichotella gemmacea     

Ming-Ping La  Jiao Li  Cui Li  Hua Tang  Bao-Shu Liu  Peng Sun  Chun-Lin Zhuang  Tie-Jun Li  Wen Zhang 《Marine drugs》2014,12(12):6178-6189

Seven new briarane diterpenoids, gemmacolides AS-AY (1–7), were isolated together with ten known analogues (8–17) from the South China Sea gorgonian Dichotella gemmacea. The structures of the new compounds were elucidated by the detailed analysis of spectroscopic data and comparison with reported data. The absolute configuration of compounds was determined based on electronic circular dichroism (ECD) experiments and genetic correlations as well. Compounds 15 and 16 were reported for the first time for the gorgonian. In the preliminary in vitro bioassays, compound 5 showed potential growth inhibitory activity against MG63 cells.  相似文献   

不同筋力小麦品种麦胚中挥发性成分的检测分析   总被引：1，自引：0，他引：1  

燕雯  张正茂  刘拉平  王甜  刘玉秀  何娇 《麦类作物学报》2013,33(4):835-839

为了研究不同筋力小麦品种麦胚的风味特点,采用顶空固相微萃取技术萃取强筋、中筋和弱筋小麦麦胚中的挥发性成分,并进行气相色谱-质谱分析.结果表明,强筋、中筋、弱筋小麦品种麦胚中分别检出32、35和28种挥发性成分,其中相同成分有19种,分别占挥发性成分含量的65％以上,说明三种不同筋力小麦品种的胚中挥发性成分存在一定差异,但大部分主要成分相同,以醇类、酚类、烃类物质为主.  相似文献   

Mapping vegetation suitability in coarse sandy hill catchment areas of the Loess Plateau     

Zhongming Wen  Xiaohui He  Feng Jiao  Tim R. McVicar  Lingtao Li  Tom G. Van Niel 《Frontiers of Forestry in China》2008,3(2):148-157

Vegetation suitability mapping is important for the selection of species for implementing the re-vegetation program in the coarse sandy hill catchment areas of the Loess Plateau, China. We introduce a Boolean model, which uses a thin plate smoothing spline interpolation method to model the distribution of precipitation and temperature and analyze the suitability of 38 species using GIS techniques considering the requirement of these species for environmental conditions. Then we overlay a single suitability map of these 38 species to obtain a species frequency map for a specific site. In our study, we mean with ‘high frequency’ a high suitability of a site for revegetation. The results show that we can model the spatial changes of vegetation suitability with a combination of topographic analyses based on DEM and GIS functions. We also demonstrate these spatial changes on the screen using Visual Basic language and GIS functions, which will help decision makers to have a clear view of species and site suitability changes over large areas. Although more powerful models, such as GLM and GAM, were not used due to data limitation, our methods can still provide some relevant insights for similar studies. __________ Translated from Science of Soil and Water Conservation, 2007, 5(1): 19–26 [译自: 水土保持科学]  相似文献   

柞树叶营养成分及脱毒处理的研究     

米拉  苏日娜  张建中  敖特根 《内蒙古林学院学报》1999,(1)

本试验对我区柞树叶的营养成分进行了分析测定,并对柞树叶的单宁进行脱毒处理。结果表明,柞树叶中粗蛋白、粗脂肪、粗灰分、粗纤维以及钙、磷的含量分别为１３．３％、４．９％、５．２％、１７．１％、０．９２％、０．１９％;氨基酸总量占粗蛋白质的７９．０％（色氨酸未测）;用石灰水浸泡法脱毒处理,可脱除９０％以上的单宁,脱毒处理对柞树叶的营养成分影响不大。  相似文献   

Dormancy breaking in Fagus sylvatica seeds is linked to formation of abscisic acid-glucosyl ester     

Vondráková  Zuzana  Pešek  Bedřich  Malbeck  Jiří  Bezděčková  Lena  Vondrák  Tomáš  Fischerová  Lucie  Eliášová  Kateřina 《New Forests》2020,51(4):671-688

New Forests - Seed dormancy is an adaptive mechanism that allows seed germination under suitable environmental conditions. Germination of stored dormant seeds proceeds after dormancy breaking...  相似文献