检索结果-南通市图书馆

Epidemiology of antibiotic resistance in Burkina Faso

Asian Pacific journal of Tropical Medicine 2008年第2期1卷 1-6页

作者： Simpore j Zeba B Karou D Ilboudo D Pignatelli S Nacoulma OG Musumeci S Saint Camille Medical Centre(SCMC) OuagadougouBurkina Faso University of Ouagadougou Burkina Faso University of Rome "Tor Vergata" RomeItaly Department of Pharmacology Gynecology and ObstetricsPediatricsUniversity of Sassari and Institute of Biomolecular ChemistryNational Research Council(CNR)Li Punti(SS)Italy

Burkina Faso(West Africa) is a tropical country with a high incidence of infectious *** uncontrolled use of antibiotics against bacterial pathogens has given rise to the emergence of antibiotic resistance in this *** aims of this study were;i) to determine the prevalences of the most important pathogenic bacteria isolated in the town of Ouagadougou;ii) to identify the bacterial species which have acquired resistance as a result of antibiotic selection;iii) to compare antibiotic-resistances of Escherichia coli isolated from stool culture in the present study with results obtained in 2002 from strains collected in the same structure in Burkina Faso;iv) to determine the trend of antibiotic resistance in Burkina Faso in order to give local advice on the most appropriate empiric antibiotic *** thousand two hundred and sixty four samples of blood,stools, urine,sputum,pus and vaginal secretion were collected and analyzed in Saint Camille Medical Center(SCMC) laboratory from May 2001 to May *** of the 6264 samples tested no pathogen was identified in 1583(25.31%),whilst 4681(74.73%) were positive with the incidence of the microrganisms isolated being as follows;Escherichia coli 1291(27.6%),Staphylococcus aureus 922(19.7%),Salmonella spp 561(12. 0%),Streptococcus spp 499(10.7%),Klebsiella spp 359(7.7%),Shigella spp(6.3%),Acinetobacter spp 266(5.7%) and others 783(16.7%).Among the isolated pathogens,the highest resistance was found to amoxicillin:Proteus spp 95,6%,Escherichia coli 78,2%,Salmonella spp 62,2%,Shigella spp 73,4% and Klebsiella spp 89,9%,followed by resistance to ampicillin and *** the prevalence of antibiotic resistance of Escherichia cob’from stool cultures isolated during 1999-2000 to that of 2001-2006, a significant reduction was found which could be due to the improved use of antibiotics in recent *** reduced antibiotic-resistance observed in pathogens isolated in Burkina Faso during this study as compa

关键词： Escherichia coli antibiotic-resistance Burkina Faso

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tolerance of Corn (<i>Zea mays</i>L.) to Early and Late Glyphosate Applications

引用

American journal of Plant Sciences 2014年第18期5卷 2748-2754页

作者： Kris j. Mahoney Robert E. Nurse Wesley j. Everman Christy L. Sprague Peter H. Sikkema Agriculture and Agri-Food Canada Harrow Canada Michigan State University East Lansing USA North Carolina State University Raleigh USA University of Guelph Ridgetown Campus Ridgetown Canada

Fifteen field experiments were conducted from 2009 to 2012 in Ontario, Canada and Michigan, USA to determine the tolerance of corn (Zea mays L.) to early (spike or 1- to 2-leaf stage) or late (8- or 10-leaf stage) applications of 900, 1800, 3600, or 7200 g·ae·ha-1 of glyphosate. Postemergence applications were evaluated for corn injury, cob length and deformity, crop moisture at harvest, and yield in the absence of weed competition. In the early application experiment, no visible injury was detected with applications of up to 3600 g·ae·ha-1;however, 1.4% injury was observed 4 weeks after treatment (WAT) when 7200 g·ae·ha-1 was applied to 1- to 2-leaf stage corn. Yet by harvest, the observed injury was transient as yields were similar to the untreated control regardless of glyphosate dose or timing. In the late application experiment, visible injury tended to increase with glyphosate dose. In addition, for corn treated with 7200 g·ae·ha-1 at the 10-leaf stage, injury increased over time as 6%, 11%, and 12% injury was observed 1, 2, and 4 WAT, respectively. Similar to the visible injury of vegetative tissue, cob deformity and reductions in yield tended to increase with glyphosate dose, but this response varied and the data were pooled into two environment groups. For example, in one environment group, corn treated with 7200 g·ae·ha-1 at the 8- and 10-leaf stage had a 9.5% and 14.6% reduction in yield, respectively. Whereas in another environment group, corn yields were similar to the untreated control regardless of glyphosate dose or timing. This research demonstrated that commercially available corn hybrids have tolerance to glyphosate at doses greater than what has been previously published or could reasonably be expected during spray overlaps in a field.

关键词： Dose Injury cob Deformity Yield

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Relationship between Physico-Mechanical Properties, Compacting Pressure and Mixing Proportion of Briquettes Produced from Maize cobs and Sawdust

引用

journal of Sustainable Bioenergy Systems 2014年第1期4卷 50-60页

作者： Stephen j. Mitchual Kwasi Frimpong-Mensah Nicholas A. Darkwa Department of Construction and Wood Technology Education University of Education Winneba Kumasi Campus Kumasi Ghana Department of Wood Science and Technology Kwame Nkrumah University of Science and Technology Kumasi Ghana

This study examined the relationship between selected physico-mechanical properties, compacting pressure and mixing proportion of briquettes produced from combination of maize cob particles and sawdust of low, medium and high density timber species. Particle sizes of maize cobs and sawdust used for the study were ≤1 mm. The two materials were combined at mixing percentages of 90:10, 70:30 and 50:50 (Sawdust:maize cobs). Briquettes were produced at room temperature (28°C) using compacting pressures 20, 30, 40 and 50 MPa. The results suggested that combining maize cob particles with sawdust of low, medium and high density wood species could significantly enhance the relaxed density, compressive strength in cleft and impact resistance index of briquettes produced from agricultural biomass residue like maize cobs. The results further indicated that the physical and mechanical characteristics of briquettes produced from combinations of sawdust of low density species and maize cobs were exceptionally higher than that produced from combinations of maize cob particles, and medium density and high density timber species. The R2 values for the regression model between the independent variables (mixing percentage and compacting pressure) and relaxed density, compressive strength in cleft and impact resistance index of briquettes produced from combinations of maize cob particles and sawdust of low density species (Ceiba pentandra) were 0.966, 0.932 and 0.710 respectively. This study provides a hope for briquetting maize cobs at room temperature using a low compacting pressure.

关键词： Briquette Compacting Pressure Maize cobs Mixing Proportions Physico-Mechanical Properties Sawdust

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物质用于焦炭和烧结生产的实验室评价

引用

世界钢铁 2012年第6期12卷 8-17页

作者： S Thomas S j McKnight E j Serrano A Malejová R Zelinsky j Tomá P Vlaic 王旭明美国钢铁公司研究与技术中心美国钢铁公司环境事务部美国钢铁公司USSE研究中心

生物质作为碳可供选择的环保替代燃料,用其进行炼焦和炼铁是一个非常好的选择,因此,应该积极调查、研究如何采取不同的方法利用生物质,以减少硫化物、氮氧化物、二氧化碳的排放和可能的成本投入。对生物质在炼焦生产与烧结生产中的实用... 详细信息

生物质作为碳可供选择的环保替代燃料,用其进行炼焦和炼铁是一个非常好的选择,因此,应该积极调查、研究如何采取不同的方法利用生物质,以减少硫化物、氮氧化物、二氧化碳的排放和可能的成本投入。对生物质在炼焦生产与烧结生产中的实用性在独立的试验中进行评估。生物质对炼焦生产的实用性研究如下:将1%～5%的木质生物质或是焙烤(轻度热解)的木质生物质作为部分高挥发性煤的替代物添加至配合煤中,在实验室焦炉中进行碳化试验。试验结果表明,当把粉碎的生物质加入到配合煤后,焦化压力显著降低,同时焦炭的硫含量下降,但是焦炭的高温强度和力学性能亦有轻微下降,但这种实测强度的降低需要进一步的研究。另外,在一系列独立试验中,通过利用生物质(分别是锯末、粉碎的玉米芯、树皮、木炭等)作为烧结用粉焦的替代燃料在实验室烧结锅进行评估。试验中,燃料用10%、20%、30%、40%的生物质代替。试验结果显示,烧结混合料的堆密度和烧结时间都有下降,添加了生物质的烧结矿质量没有显著恶化。这些初步的试验表明,在实际的炼焦与炼铁生产中生物质很有可能作为一种可再生能源替代部分传统的化石燃料。为了某种特定应用而进行产品优化则需要额外试验。

关键词：生物质干燥二氧化碳焦炭烧结矿试验炉烧结锅

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Effect of Maize Grain Size on the Physicochemical Properties of Isolated Starch, Crude Maize Flour and Nixtamalized Maize Flours

引用

Agricultural Sciences 2016年第2期7卷 114-125页

作者： Lineth j. Vega-Rojas Margarita Contreras-Padilla Natalia Rincon-Londoño alicia del Real López Rosa M. Lima-Garcia Natalia Palacios-Rojas Mario E. Rodriguez-Garcia Maestría en Ciencias Químico-Biológicas Facultad de Química Universidad Autónoma de Querétaro Querétaro México División de Investigación y Posgrado Facultad de Ingeniería Universidad Autónoma de Querétaro Cerro de las Campanas s/n Las Campanas Santiago de Querétaro Querétaro México Departamento de Nanotecnología Centro de Física Aplica y Tecnología Avanzada Universidad Nacional Autónoma de México Campus Juriquilla Querétaro México Posgrado en Ciencia e Ingeniería de Materiales Centro de Física Aplica y Tecnología Avanzada Universidad Nacional Autónoma de México Campus Juriquilla Querétaro México International Maize and Wheat Improvement Center (CIMMYT) Km 45 Carretera México-Veracruz Texcoco México Licenciatura en Ingeniería Física Facultad de Ingeniería Universidad Autónoma de Querétaro Querétaro México

Usually, the maize cob is formed by grains of medium size. However, the extremes have larger or smaller size grains. The objective of this study was to investigate the influence of grain size from the same hybrid on the physicochemical properties of isolated starch, crude maize flours and nixtamalized maize flours. Two hybrids, one from CIMMyT-Mexico called IMIC-254 and one commercial sample from Monsanto (Puma) were studied. The isolated starch granules from small, medium, and large grains exhibit the same size and distribution. The grain size has influence in the determination of cooking and steeping times;small grains reach these parameters faster than medium and large ones. The hardness of the grain size for both hybrids does not showed statistical differences between them. The starch from small, medium and large grains is mainly composed of amylopectin;this result is confirmed by X-ray diffraction and Megazine analysis. The apparent viscosity of the isolated starches of small grains showed statistically significant higher peak values. According to these results, it is possible to use small, medium, and large grains to obtain products with the same physicochemical properties, by adjusting the cooking and steeping times and Ca2+ content.

关键词： Maize Grain Size Nixtamalization Starch Rheological Properties

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

玉米秸秆对风沙土土壤微生物的影响

引用

内蒙古林业科技 2019年第1期45卷 5-10页

作者：袁立敏张文军闫德仁黄海广刘博内蒙古自治区林业科学研究院内蒙古呼和浩特010010 内蒙古自治区森林资源资产评估管理中心内蒙古呼和浩特010010

本研究以新型沙袋沙障为研究对象,分别对不同内部添加物、不同外层材料袋沙障内部、外部风沙土土壤细菌、真菌、放线菌及土壤微生物总量进行了测定。结果表明:沙袋沙障内添加玉米秸秆、玉米芯营养物质能够有效改善沙袋沙障内部风沙土环... 详细信息

本研究以新型沙袋沙障为研究对象,分别对不同内部添加物、不同外层材料袋沙障内部、外部风沙土土壤细菌、真菌、放线菌及土壤微生物总量进行了测定。结果表明:沙袋沙障内添加玉米秸秆、玉米芯营养物质能够有效改善沙袋沙障内部风沙土环境,沙障内部微生物数量显著提高,微生物总数量分别达到了7.35×10~7 cfu/g、9.47×10~7 cfu/g,分别是对照(只灌装风沙土)沙袋沙障的113.11倍、145.62倍,并且添加玉米芯的作用效果更加显著,土壤微生物总数比添加玉米秸秆的高28.77%;添加玉米秸秆、玉米芯均对土壤真菌的影响较大,真菌数量可升高至微生物总数量的50%以上;玉米秸秆、玉米芯添加量越多,微生物数量越多,添加物体积百分比达到20%时,土壤微生物总数达到了1.01×10~8 cfu/g,随着添加量的继续增加,沙障内微生物数量无显著增加趋势;3种外层材料黄麻纤维、玻璃纤维、稻草沙袋沙障内部微生物总数排序为黄麻纤维>稻草>玻璃纤维,黄麻纤维沙障内部土壤细菌、真菌、放线菌三者总数分别比稻草、玻璃纤维的高58.80%、112.64%。

关键词：沙袋沙障外层材料填充物细菌真菌放线菌库布齐沙漠

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：