The Development of Tissue around Various Prosthetic Implants Used as Replacements for Ligaments and Tendons     

Goodship AE  Wilcock SA  Shah JS 《Veterinary surgery : VS》1986,15(3):245-245

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黄芪成分对鸡外周血淋巴细胞增殖反应的影响   总被引：18，自引：3，他引：15  

高微微  曹丽  李展  佟建明  萨仁娜 《中国兽药杂志》2001,35(6):16-18

采用ELISA方法检测不同工艺生产的黄芪多糖和黄芪皂苷体外对ConA和LPS刺激鸡外周血中淋巴细胞增殖反应影响。4种工艺生产的黄芪多糖及2种工艺生产的黄芪皂苷对ConA诱导的鸡外周血T淋巴细胞增殖有明显的促进作用。其中2种黄芪多糖对LPS诱导的鸡外周血B淋巴细胞增殖也有明显促进作用。实验所用的3种工艺生产的黄芪皂苷对LPS诱导的鸡外周血B淋巴细胞增殖均无促进作用。说明不同工艺生产的黄芪多糖和黄芪皂苷体外对鸡免疫细胞功能的影响有很大差异。  相似文献   

Sulfonylurea herbicide-resistant Monochoria vaginalis in Korean rice culture     

Kuk YI  Jung HI  Kwon OD  Lee DJ  Burgos NR  Guh JO 《Pest management science》2003,59(9):949-961

Nine Monochoria vaginalis Pres1 accessions from Chonnam province, Korea were tested for resistance to the sulfonylurea herbicide, imazosulfuron, in whole-plant response bioassay. All accessions were confirmed resistant (R) to imazosulfuron. The GR50 (imazosulfuron concentration that reduced shoot dry weight by 50%) values of R accessions were 1112-3172 (accession #9) times higher than that of the standard susceptible (S) accession. Accession #9 exhibited cross-resistance to other sulfonylurea herbicides, bensulfuron-methyl, cyclosulfamuron and pyrazosulfuron-ethyl, but not to the imidazolinone herbicides, imazapyr and imazaquin. The R biotype could be controlled by other herbicides with different modes of action, such as mefenacet and pyrazolate, applied to soil at recommended rates. Foliar-applied herbicides, 2,4-D and bentazone, also controlled both the R and S biotypes. Sulfonylurea-based mixtures, except ethoxysulfuron plus fentrazamide, did not control resistant M. vaginalis. Rice yield was reduced 70% by resistant M. vaginalis that escaped pyrazosulfuron-ethyl plus molinate, compared with hand weeding in direct-seeded rice culture. In contrast, rice yield was reduced 44% by resistant M. vaginalis that survived the pyrazosulfuron-ethyl plus molinate treatment, compared with pyrazolate plus butachlor in transplanted rice culture. In vitro acetolactate synthase (ALS) activity of the R biotype was 183, 35, 130 and 31 times more resistant to imazosulfuron, bensulfuron-methyl, cyclosulfamuron and pyrazosulfuron-ethyl, respectively, than the S biotype. Imidazolinone herbicides, imazapyr and imazaquin had similar effect on in vitro ALS activity of the R and S biotypes. The in vivo ALS activity of the R biotype was also less affected than the S biotype by the sulfonylurea herbicides imazosulfuron and pyrazosulfuron-ethyl. Results of in vitro and in vivo ALS assays indicate that the resistance mechanism of M. vaginalis to sulfonylurea herbicides may be due, in part, to an alteration in the target enzyme, ALS. Since the level of resistance in the enzyme assay was much lower than that in the whole-plant assay, other mechanisms of resistance, such as herbicide metabolism, may be involved.  相似文献   

两种人工栽培藏茵陈生物学特性的研究     

韩君伟  洒威 《草业与畜牧》2007,(9):18-20

通过椭圆叶花猫（Halenia elliptica D．Don）、四数獐牙菜（Swertia tetraptera maxim）的人工栽培试验表明：两种藏茵陈植物都为两年生草本，第一年仅以叶簇形态生枝条不伸长，只进行营养生长，生长第二年枝条才开始伸长，开花结实后完成生活史；两种藏茵陈播种时间都以秋播为宜，有利于自然通过低温春化作用打破种子休眠，促进翌年春天种子萌发，显著提高田间出苗率；两种藏茵陈通过人工栽培，其茎、叶都比野生植物生长高大、粗壮，可大幅提高生药产量，是保护珍稀野生植物资源的有效途径之一；两种藏茵陈50％以上的种子在土壤中有较长期的休眠特性，一般在一年中的春秋两季萌发，所以适当增加播种量第二年后可使田间一年、二年生植株同时生长，对生药生产可连年持续收获产品，免去了对土壤的耕、翻、耙、种等作业，从而可有效降低栽培成本。  相似文献   

天麻高产栽培配套技术     

杨途熙  魏安智  韩东锋  杨恒  张睿  撒文清  杨桂芳 《陕西林业科技》2002,(3):81-83

本文在试验的基础上 ，结合生产实际，总结出了克服天麻无性繁殖中麻种退化，实现天麻高产稳产的配套栽培技术。  相似文献   

单板密度β射线检测法的研究   总被引：1，自引：1，他引：1  

李慧  撒潮  李丽 《林业机械与木工设备》2007,35(8):19-22

单板是制造层积材、胶合板等人造板材的基础材料,其密度对人造板材的机械、物理性能影响很大.对单板密度进行快速无损检测具有较高的实用价值.本文在分析国内外木材密度检测现状的基础上,提出了一种以计算机为核心的可以在线、无损检测单板密度的β射线检测法,并研究了系统的实现原理.  相似文献   

ALA对红掌叶片光合作用及叶绿素荧光参数的影响     

康博文  李文华  刘建军 《西北农林科技大学学报(自然科学版)》2009,37(4):97-102

【目的】探讨叶面喷施5-氨基乙酰丙酸(ALA)对红掌光合作用及叶绿素荧光参数的影响,为花卉植物上合理施用ALA奠定基础。【方法】选择3组红掌,每组60株,自2007-07-15~10-30,每15 d每组叶面分别喷施1次0(清水),200和400 mg/L的ALA,利用Li-6400光合测定系统和Li-6400-40荧光叶室分别测定不同质量浓度ALA处理对红掌叶片光合作用及叶绿素荧光参数指标的影响。【结果】与对照相比,200和400 mg/L ALA处理的红掌叶片叶绿素总量均极显著(P<0.01)提高,提高幅度分别为6.7%和8.5%;1 d中(8:00~18:00)的光合速率显著提升,在较高光辐射强度下,光合速率的提高更为明显;初始荧光(Fo)极显著(P<0.01)地降低,降低幅度分别为7.5%和10.4%;最大荧光(Fm)、可变荧光(Fv)、最大光化学效率(Fv/Fm)、潜在光化学效率(Fv/Fo)、光能获取能力(1/Fo-1/Fm)依次提高0.3%和0.7%,2.5%和3.8%,2.2%和3.1%,10.7%和15.8%,10.4%和15.0%,差异达极显著(P<0.01)或显著(P<0.05)水平;200和400 mg/L ALA处理对有效光化学速率(Fv′/Fm′)的影响不显著(P>0.05),但可使ФPSⅡ分别提高42.4%和66.7%,NPQ分别提高2.1%和3.3%,qP分别提高43.0%和67.7%,差异均达显著水平(P<0.05);可使PCR分别降低13.9%和40.0%,ETR分别提高37.1%和61.9%,差异均达极显著水平(P<0.01)。【结论】喷施ALA可以提高红掌叶片的光化学效率,对降低不良环境的胁迫有积极作用,因而其可以在红掌上施用。  相似文献   

U/Pb zircon geochronology and tempo of the end-permian mass extinction     

SA Bowring  DH Erwin  Jin M W Martin YG  K Davidek  W Wang 《Science (New York, N.Y.)》1998,280(5366):1039-1045

The mass extinction at the end of the Permian was the most profound in the history of life. Fundamental to understanding its cause is determining the tempo and duration of the extinction. Uranium/lead zircon data from Late Permian and Early Triassic rocks from south China place the Permian-Triassic boundary at 251.4 +/- 0.3 million years ago. Biostratigraphic controls from strata intercalated with ash beds below the boundary indicate that the Changhsingian pulse of the end-Permian extinction, corresponding to the disappearance of about 85 percent of marine species, lasted less than 1 million years. At Meishan, a negative excursion in delta13C at the boundary had a duration of 165,000 years or less, suggesting a catastrophic addition of light carbon.  相似文献   

三拂微乳剂防治稻纵卷叶螟效果初报     

周耀建  刘玉  沙金红 《大麦与谷类科学》2007,(2):43-44

近几年来,稻纵卷叶螟在里下河地区持续大发生,成为水稻生产的重要害虫.随着剧毒、高毒农药禁止生产、销售,筛选高效、低毒、低残留农药防治稻纵卷叶螟成为亟需解决的课题.2006年我们与浙江新农化工有限公司合作,用该公司最新研制的31%三拂微乳剂农药,在田间进行防治稻纵卷叶螟的药效试验,取得了较好结果.  相似文献   

蓟马对紫花苜蓿危害的空间分布特征   总被引：2，自引：0，他引：2  

刘玉良  米福贵  特木尔布和  王普昶  马小廷  撒多文 《华北农学报》2009,24(2)

昆虫空间分布格局是其种群的一种客观属性,对于同一种群,其格局类型是固有的.蓟马为一种体型较小的昆虫,取食时移动性强,易逃逸,所以用危害特征的空间分布来代替其本身的空间分布更具有稳定性和实用性.采用不同尺度研究探讨蓟马对紫花苜蓿危害的空间分布特征.研究表明在现蕾期危害空间分布为聚集分布,危害斑块尺度是40 cm×30 cm～50 cm×30 cm的椭圆型,长轴方向是东西向.因此在这一物候期选择抗蓟马材料时,取样应该按南北方向,尺度距离大于40～50 cm,更具有代表性,在开花期危害空间分布为均匀分布,但是取样尺度也应大于40～50 cm,更具有代表性,而且在开花期取样要比现蕾期取样更好一些,会减少取样误差.  相似文献