Typing of Staphylococcus aureus isolated from bovine mastitis cases in Australia and India          下载免费PDF全文

J Gogoi‐Tiwari  C Babra Waryah  R Sunagar  HB Veeresh  V Nuthanalakshmi  PL Preethirani  R Sharada  S Isloor  A Bhat  H Al‐Salami  NR Hegde  TK Mukkur 《Australian veterinary journal》2015,93(8):278-282

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冀中南棉区棉花黄萎病发生与气象因子关系分析   总被引：8，自引：0，他引：8  

齐俊生  马存  李红梅  姚树然 《棉花学报》1998,(5)

１９８６～１９９６年在石家庄河北棉花所黄、枯萎病混生病圃,对中棉所１２每年８月２０～２５日进行黄萎病调查,并与当地６～８月每旬的平均气温、降水量、日照时数和空气相对湿度等与发生黄萎病关系进行单项和综合分析。结果表明,７月份气温２７℃是发病轻重的转折点,７月中下旬的气温是影响黄萎病发病强度的主要因素,可分为高温、低湿、少雨轻病年和低温、高湿、多雨重病年,两者出现频率接近５０％。经过对黄萎病指（Ｙ）与所有因子逐步回归分析,入选因子为７月中旬湿度（Ｘ５）、６月下旬降水量（Ｘ１２）、７月中旬降水量（Ｘ１４）、７月下旬日照时数（Ｘ２４）和６月下旬平均气温（Ｘ３０）,得出回归方程可试用于黄萎病发病的预测预报。  相似文献   

The effect of root-absorbed PSII inhibitors on Kautsky curve parameters in sugar beet   总被引：2，自引：0，他引：2  

M ABBASPOOR  HB TEICHER†  & JC STREIBIG 《Weed Research》2006,46(3):226-235

The effects of the photosystem II inhibitors metamitron and terbuthylazine on the shape of the Kautsky (chlorophyll fluorescence induction) curve were investigated in sugar beet grown in hydroponic culture. The objective of the study was to trace recovery processes following herbicide injury using Kautsky curve parameters. Metamitron is used for selective weed control in sugar beet because it is metabolized in this crop. In contrast, terbuthylazine is toxic to sugar beet. Two hours after treatment, various fluorescence induction curve parameters, such as maximum quantum efficiency (F_V/F_m), the relative changes at the J step (F_vj) and area (the area between the Kautsky curve and maximum fluorescence, F_m), were affected by metamitron at concentration ranges of 70–280 mg active ingredient (a.i.) L^?1 in plants treated at the four‐true‐leaf stage. Shortly after herbicide application, F_v/F_m was more affected by the hydrophilic metamitron [log(K_ow) = 0.83] than by the lipophilic terbuthylazine [log(K_ow) = 3.21], but these differences between compounds were alleviated as metamitron was metabolized and terbuthylazine was not. Terbuthylazine at 1 mg a.i. L^?1 affected sugar beet at the four‐ and six‐true‐leaf stages to the same extent, whereas metamitron at a dose of 140 mg a.i. L^?1 affected much more at four‐ than at the six‐true‐leaf stage. Sugar beet recovered from metamitron injury even at high doses (140 and 280 mg a.i. L^?1). Fluorescence induction curve parameters were similarly affected by terbuthylazine and, although sugar beet recovered from terbuthylazine injury at low doses (<0.2 mg a.i. L^?1), the Kautsky curve was irreversibly affected at higher doses (1–10 mg a.i. L^?1), leading finally to plant death. Older plants were affected later, and recovered sooner, from both herbicides.  相似文献   

高效液相色谱仪期间核查方法研究     

胡大方  王海波 《中国兽药杂志》2005,39(11):14-15

高效液相色谱仪做为强制检定仪器除按规定定期送法定检定机构进行检定外,在两次检定周期之间还需对使用频率高的仪器进行期间核查以维持设备校准状态的可信度.本文简述了期间核查的项目和方法,包括外观检查、输液系统检查、色谱柱和检测器性能检查及做好检查和处理结果的记录.  相似文献   

Thermally Switchable Periodicities and Diffraction from Mesoscopically Ordered Materials     

JM Weissman  HB Sunkara  AS Tse  SA Asher 《Science (New York, N.Y.)》1996,274(5289):959-960

Two switchable, mesoscopically periodic materials were created by combining crystalline colloidal array (CCA) self-assembly with the temperature-induced volume phase transition of poly(N-isopropylacrylamide) (PNIPAM). Body-centered-cubic CCAs of hydrated, swollen PNIPAM particles Bragg-diffract infrared, visible, and ultraviolet light weakly, whereas arrays of compact shrunken particles diffract efficiently. A tunable diffracting array was also created by embedding a CCA of polystyrene spheres within a PNIPAM hydrogel that swells and contracts with temperature; thus the array lattice constant varies with temperature, and the diffracted wavelength was thermally tunable across the entire visible spectrum. These materials may find applications in many areas of optics and materials science.  相似文献