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Refining Soil Organic Matter Determination by Loss-on-Ignition

Pedosphere 2011年第4期21卷 473-482页

作者： M.h.SALEhI O.hAShEMI BENI h.beigi harchegani I.ESFANDIARPOUR BORUJENI h.R.MOTAGhIAN Department of Soil Science College of AgricultureShahrekord University Department of Soil Science College of AgricultureVali-e-Asr University

Wet oxidation procedure,i.e.,Walkley-Black (WB) method,is a routine,relatively accurate,and popular method for the determination of soil organic matter (SOM) but it is time-consuming,costly and also has a high potential to cause environmental pollution because of disposal of chromium and strong acids used in this ***,loss-on-ignition (LOI) procedure,a simple and cheap method for SOM estimation,which also avoids chromic acid wastes,deserves more *** aims of this research were to study the statistical relationships between SOM determined with the LOI (SOMLOI) and WB (SOMWB) methods to compare the spatial variability of SOM in two major plains,Shahrekord and Koohrang plains,of Chaharmahal-va-Bakhtiari Province,*** surface soil samples (0-25 cm) were randomly collected in each plain to determine SOM using the WB method and the LOI procedure at 300,360,400,500 and 550 ℃ for 2 *** samples covered wide ranges of soil texture and calcium carbonate equivalent (CCE).The general linear form of the regression equation was calculated to estimate SOM LOI from SOM obtained by the WB method for both overall samples and individual *** soil samples were also randomly selected to compare the SOM and CCE before and after ignition at each *** accuracy of the continuous maps generated for the LOI and WB methods was considered to determine the accordance of two *** showed a significant positive linear relationship between SOM LOI and SOM *** of determination (R2) of the equations for individual plains were higher than that of the overall *** of determination and line slopes decreased and root mean square error (RMSE) increased with increasing ignition temperature,which may be due to the mineral structural water loss and destruction of carbonates at higher temperatures.A temperature around 360 ℃ was identified as optimum as it burnt most organic carbon,destroyed less inorganic carbon,cau

关键词： calcium carbonate equivalent ignition temperature kriged maps spatial variability wet oxidation

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与细菌性阴道病治疗相关的抗微生物药物的耐药性

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世界核心医学期刊文摘（妇产科学分册） 2005年第3期1卷 11-11页

作者： beigi R.h. Austin M.N. Meyn L.A. 程广艳

This study was undertaken to evaluate antimicrobial susceptibility of vaginal anaerobic bacteria before and after treatment of bacterial vaginosis. A randomized clinical trial of 119 nonpregnant women with bacterial vaginosis receiving either intravaginal metronidazole for 5 days or clindamycin for 3 days was performed. Women had 1 baseline and 3 followup visits at which quantitative vaginal cultures were performed. Anaerobic isolates underwent antimicrobial susceptibility testing. Complete susceptibility data was available on 95 women (47 metronidazole and 48 clindamycin). Of 1059 anaerobic bacterial isolates, less than 1% demonstrated resistance to metronidazole. In contrast, 17% demonstrated baseline clindamycin resistance, and 53% demonstrated resistance to clindamycin after therapy. Women exposed to clindamycin (but not metronidazole) had high frequencies (80% ) of clindamy cin resistant anaerobic bacteria that persisted for 90 days after treatment. Treatment of bacterial vaginosis with clindamycin is associated with marked evidence of antimicrobial resistance among vaginal anaerobic bacteria. This may increase the vaginal reservoir of macrolide resistant bacteria.

关键词：细菌性阴道病抗微生物药物敏感性检测定量培养厌氧菌耐药菌分离株非妊娠妇女随机临床试验大环内酯类药物

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