检索结果-南通市图书馆

Journal of Pharmaceutical Analysis 2013年第3期3卷 161-167页

作者： Vicky Manyanga Ehab Elkady Jos Hoogmartens erwin Adams Laboratory for Pharmaceutical Analysis Faculteit Farmaceutische Wetenschappen KU LeuvenO&N2 PB 923 Herestraat 49 B-3000 Leuven Belgium Pharmaceutical Chemistry Department Faculty of Pharmacy Cairo University Kasr El-Aini St.Cairo 11562 Egypt

Tobramycin is one of the aminoglycoside antibiotics that lack a UV absorbing chromophore. However, the application of pulsed electrochemical detection （PED） has been used successfully for the analysis of this and similar antibiotics. This work describes an improved liquid chromatographic （LC） method combined with PED, which is able to separate much more impurities than before. Using a Discovery C-18 RP column （250 mm × 4.6 mm i.d., 5 μm）, isocratic elution was carried out with a mobile phase, containing sodium sulfate （35 g/L）, sodium octanesulphonic acid （1 g/L）, tetrahydrofuran （14mL/L） and 0.2 M phosphate buffer pH 3.0 （50 mL/L）. Using these experimental conditions, the limit of quantification （LOQ, S/N= 10） was 5 ng. The linearity was examined in the range LOQ-60 μg/mL and the coefficient of determination was 0.998. The method also proved to be repeatable and the recovery was close to 100%. The influence of the different chromatographic parameters on the separation was investigated by means of an experimental design. The proposed method is useful in quality control of tobramycin drug substances and drug products.

关键词： Liquidchromatography-Pulsed electrochemicaldetection Tobramycin Aminoglycosideantibiotics

维普期刊数据库

Identification of characteristic plant co-occurrences in neotropical secondary montane forests

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2009年第1期2卷 31-41页

作者： Miguel D.Mahecha Alfredo Martı´nez Holger Lange Markus Reichstein erwin Beck Max Planck Institute for Biogeochemistry PO Box 10016407701 JenaGermany Department of Environmental Sciences Swiss Federal Institute of Technology—ETH Zurich8092 ZurichSwitzerland Bayreuth Centre for Ecology and Environmental Research University of Bayreuth95440 BayreuthGermany Fundacion Cordillera Tropical Jaime Roldos 4-80 y Huayna CapacEd.El Consorcio of.412CuencaEcuador Norwegian Forest and Landscape Institute PO Box 1151431 AsNorway

Aims Inferring environmental conditions from characteristic patterns of plant co-occurrences can be crucial for the development of conservation strategies concerning secondary neotropical ***,nomethodological agreement has been achieved so far regarding the identification and classification of characteristic groups of vascular plant species in the *** study examines botanical and,in particular,statistical aspects to beconsidered in such *** on these,we propose a novel data-driven approach for the identification of characteristic plantco-oc currences in neotropical secondary mountain *** Floristic inventory data were gathered in secondary tropical mountain forests in *** classification was performed by coupling locally adaptive isometric feature mapping,a non-linear ordination method and fuzzy-c-means *** approach was designed for dealing with underlying non-linearities and uncertainties in the inventory *** Findings The results indicate that the applied non-linear mapping in combination with fuzzy classification of species occurrence allows an effective identification of characteristic groups of co-occurring species as fuzzy-defined *** selected species indicated groups representing characteristic life-form distributions,as they correspond to various stages of forest *** the identified‘characteristic species groups’with meta-information derived from accompanying studies indicated that the clusters can also be related to habitat *** conclusion,we identified species groups either characteristic of different stages of forest succession after clear-cutting or of impact by fire or a *** expect that the proposed data-mining method will be useful for vegetation classification where no a priori knowledge is available.

关键词： secondary tropical mountain forests characteristic species groups non-linear ordination fuzzy-c-means clustering Ecuador

Geological setting, mining and reduction of mercury vapor contamination in the gold-silver district of Vetas-Calofornia （Santander, Colombia）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Episodes 2005年第4期28卷 252-256页

作者： erwin Wolff Carreno Juan Manuel Pinzon Angel Rodolfo Contreras Moreno Christoph Bernardy Corporacion Autonoma Regional Para la Defensa de la Mescta de Bucaramanga Carrera 23 N°37-63 Bucaramanga Colombia Formely with Corporacidn Autonoma Regional Para la Defensa de la Mescta de Bucaramanga Carrera 23 N°37-63 Bucaramanga Colombia. Formerly with Federal Institute for Geosciences and Natural Resources Stilleweg 2 30655 Hannover Germany

Bucaramanga, with a population of about one million, is the capital of the Department of Santander （Colombia）, and has the Rio Surata as its main source of drinking water. In the upper reaches of the river, small-scale gold mining has been going onfor many centuries （Vetas-California mining district）. Geologically, the Vetas-California mining district is part of the Santander Massif which is composed of pre-Devonian metamorphic rocks and Mesozoic igneous rocks. The mineralisation is restricted to structurally controlled veins and is often associated with hydrothermal alteration. There is also disseminated mineralisation, but presently only the vein-type is mined. The processing residues are discharged into the nearby watercourses, contaminating the waters of the Surata river basin. As part of a joint Colombian-German technical cooperation project, with the purpose of controlling the negative environmental effects of gold mining pollution, an integrated distillation system for the recovery of mercuury. has been designed and tested.

关键词：地质条件矿床哥伦比亚蒸发作用金银

Incidence of colorectal neoplasms among male pilots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第27期20卷 9116-9120页

作者： Menachem Moshkowitz Ohad Toledano Lior Galazan Aharon Hallak Nadir Arber erwin Santo Integrated Cancer Prevention Center and Department of Gastroenterology Tel-Aviv Sourasky Medical Center and Sackler Faculty of Medicine Tel-Aviv University

AIM: To assess the prevalence of colorectal neoplasms (adenomas, advanced adenomas and colorectal cancers) among Israeli military and commercial airline pilots.

关键词： Colorectal cancer Adenomatous polyps Colon neoplasms Hyperplastic polyps

Microbial Diversity of Planctomycetes and Related Bacteria in Wetlands with Different Anthropogenic Disturbances

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

湿地科学 2013年第2期11卷 158-166页

作者： Yu Wang Guibing Zhu erwin van der Biezen Mike S M Jetten Chengqing Yin State Key Laboratory of Environmental Aquatic Quality Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Department of Microbiology Institute for Water and Wetland Research (IWWR) Radboud University Nijmegen

The diversity of Planctomycetes and related bacteria in 3 types of freshwater wetlands with different anthropogenic disturbances were investigated by cloning and sequencing PCR-amplified partial 16S rRNA genes. Three clone libraries were constructed using 16S rRNA-targeted forward PCR primer specific for Planctomycetales and general bacterial reverse primer. Phylogenetic analysis of the 16S rRNA gene sequences defined 95 operational taxonomic units (OTUs) with 163 sequences. The clone libraries covered a wide microbial diversity of Proteobacteria and the Planctomycetes-Verrucomicrobia-Chlamydiales (PVC) superphylum. The majority of the OTUs were related to the phylum of Planctomycetes (33 OTUs), Proteobacteria (22 OTUs) and Verrucomicrobia (22 OTUs). Four known genera from the Planctomycetes phylum were all detected. The genus Pirellula (18 OTUs) dominated the Planctomycetes community, but different patterns of distribution were observed in the wetlands. The littoral wetlands of Baiyangdian Lake with the least anthropogenic disturbances covered more species and showed the highest biodiversity. However, the Jiaxing paddy fields with the highest anthropogenic disturbances showed a higher biodiversity than that in the riparian wetlands of the North Canal. Bacteria distantly related to anammox bacteria were also detected with a small proportion (4 OTUs). It showed that wetlands hold a great biodiversity of phyla Planctomycetes and related bacteria; furthermore, there is ample opportunity to discover novel phylotypes of Planctomycetes in the wetland ecosystems.

关键词： Planctomycetes biodiversity PVC superphylum anthropogenic disturbances freshwater wetlands

维普期刊数据库

临汾市树叶磁性的时空变化特征及其对大气重金属污染的指示

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2016年第5期59卷 1729-1742页

作者：曹丽婉胡守云 Appel erwin 师尚礼尹刚德国图宾根大学地球科学系地球物理实验室德国72076 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008 草业生态系统教育部重点实验室(甘肃农业大学) 兰州730070

粉煤灰经工厂废气排放进入大气,对人类健康和生态系统都造成了无法弥补的破坏.本文选取具有高空间分辨率优势的树叶作为收集粉煤灰的载体,对临汾市大气中可吸入颗粒物进行磁学参数和重金属含量监测.结果表明,磁化率最大值出现在工厂污... 详细信息

粉煤灰经工厂废气排放进入大气,对人类健康和生态系统都造成了无法弥补的破坏.本文选取具有高空间分辨率优势的树叶作为收集粉煤灰的载体,对临汾市大气中可吸入颗粒物进行磁学参数和重金属含量监测.结果表明,磁化率最大值出现在工厂污染源附近,磁化率空间分布呈现随污染源距离增加而降低的趋势.工业区收集到的磁性颗粒以低矫顽力、粗粒度的磁铁矿为主.夏季磁性矿物来源单一,主要为人为影响.冬季大气中悬浮的磁性颗粒有部分来自于西北风/北风的自然尘降.同一采样点磁化率随时间变化特征表明,树叶的磁学性质可以灵敏和有效地反映较短时期内大气污染的现状.统计分析表明磁化率和重金属元素(铁,铬,镍,铜,铅,钴)之间存在显著相关性.污染负荷指数用于评估研究区域内重金属各元素综合污染的程度.结果显示,在废弃的旧工业区附近无大气污染指示,但在运营中的工厂集中的地区,大气均受到严重污染.污染负荷指数与表征磁性矿物含量的磁化率呈相关性(r2=0.66),因此树叶的磁性参数可以作为大气重金属污染的替代指标.

关键词：环境磁学粉煤灰重金属污染污染负荷指数临汾市

维普期刊数据库

Vision rehabilitation using microperimetric biofeedback training in age-related macular degeneration

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2023年第6期16卷 933-938页

作者： Sri Hudaya Widihastha erwin Iskandar Karmelita Satari Irawati Irfani Rova Virgana Primawita Oktarima Amiruddin Department of Ophthalmology Faculty of MedicineUniversitas PadjadjaranBandung 40117Indonesia National Eye Center Cicendo Hospital Bandung 40117Indonesia

·AIM: To determine the impact of microperimetric biofeedback training(MBFT) on the quality of vision in patients with age-related macular degeneration(AMD).·METHODS: This study was a prospective, interventional, comparative study with subjects of patients diagnosed with AMD in the National Eye Center Cicendo Eye Hospital, Indonesia. Patients were randomly divided into two groups, intervention and non-intervention with 18 patients in each group. The intervention group would receive six MBFT training sessions of 10-minute time duration each.·RESULTS: A statistically significant improvement of best corrected visual acuity(BCVA) was found after the intervention, from 1.24±0.416 to 0.83±0.242(log MAR;P<0.001). A statistically significant improvement for near vision acuity(NVA) was also observed, from 1.02±0.307 log MAR to 0.69±0.278 log MAR(P<0.001). In addition, reading rate increased, from 40.83±30.411 to 65.06±31.598 words/min(P<0.001). Similarly, a comparison of changes in BCVA, NVA, and reading rate between intervention and non-intervention groups showed a significant difference(P<0.001).·CONCLUSION: MBFT significantly and positively impacts visual acuity, NVA, and reading rate in patients with AMD.

关键词： microperimetric biofeedback training agerelated macular degeneration vision rehabilitation

Diet of patients after pouch surgery may affect pouch inflammation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第38期19卷 6458-6464页

作者： Orit Ianco Hagit Tulchinsky Michal Lusthaus Amos Ofer erwin Santo Nachum Vaisman Iris Dotan Comprehensive Pouch Clinic IBD CenterDepartment of Gastroenterology and Liver DiseasesTel Aviv Sourasky Medical CenterTel Aviv 64239Israel Sackler Faculty of Medicine Tel Aviv UniversityTel Aviv 64239Israel Comprehensive Pouch Clinic and the Proctology Unit Department of SurgeryTel Aviv Sourasky Medical CenterTel Aviv 64239Israel Unit of Clinical Nutrition Tel Aviv Sourasky Medical CenterTel Aviv 64239Israel

AIM:To investigate the diet of pouch patients compared to healthy controls,and to correlate pouch patients’diet with disease ***:Pouch patients were recruited and prospectively followed-up at the Comprehensive Pouch Clinic at the Tel Aviv Sourasky Medical *** behavior was determined based on clinical,endoscopic and histological *** age-and sex-matched volunteers were selected from the"MABAT"Israeli Nutrition and Public Health Governmental Study and served as the control *** the participants completed a 106-item food frequency questionnaire categorized into food groups and nutritional values based on those used in the United States Department of Agriculture food pyramid and the Israeli food *** on Dietary behavior,food avoidance,the use of nutritional supplements,physical activity,smoking habits,and body-mass index(BMI)were also *** patients who had familial adenomatous polyposis(n=3),irritable pouch syndrome(n=4),or patients whose pouch surgery took place less than one year previously(n=5)were excluded from ***:The pouch patients(n=80)consumed significantly more from the bakery products food group(1.2±1.4 servings/d vs 0.6±1.1 servings/d,P<0.05)and as twice as many servings from the oils and fats(4.8±3.4 servings/d vs 2.4±2 servings/d,P<0.05),and the nuts and seeds food group(0.3±0.6 servings/d vs 0.1±0.4 servings/d,P<0.05)compared to the controls(n=80).The pouch patients consumed significantly more total fat(97.6±40.5 g/d vs 84.4±39 g/d,P<0.05)and fat components[monounsaturated fatty acids(38.4±16.4 g/d vs 30±14 g/d,P<0.001),and saturated fatty acids(30±15.5 g/d vs 28±14.1 g/d,P<0.00)]than the *** contrast,the pouch patients consumed significantly fewer carbohydrates(305.5±141.4 g/d vs 369±215.2 g/d,P=0.03),sugars(124±76.2 g/d vs 157.5±90.4 g/d,P=0.01),theobromine(77.8±100 mg/d vs 236.6±244.5 mg/d,P<0.00),retinol(474.4±337.1μg/d vs 832.4±609.6μg/d,P<0.001)and dietary fibers(26.2±15.4

关键词： Ulcerative colitis Dietary reference intake Body mass index Ileal-pouch anal anastomosis Pouch surgery Food frequency questionnaire

Traumatic aortic rupture mimicking intramural hematoma of the entire thoracic aorta

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华胸心血管外科杂志 2003年第4期 68-69页

作者： Paul R. Vogt , Joerg Babin-Ebell , erwin P. Bauer Department for Cardiovascular Surgery University Hospital Giessen and the Kerckhoff Clinic Foundation Bad Nauheim Germany Department for Cardiovascular Surgery University Hospital Giessen and the Kerckhoff Clinic Foundation Bad Nauheim Germany Department for Cardiovascular Surgery University Hospital Giessen and the Kerckhoff Clinic Foundation Bad Nauheim Germany

抢救 1例因摩托车事故急诊入院男病人。X线胸片发现病人右气管旁外侧纹理和左纵隔影异常增宽 ,并扩展至主动脉弓水平。经食管心脏超声检查发现围绕主动脉根部和升主动脉的壁间水肿 ,延伸至主动脉弓和左横膈下水平的全程降主动脉 ;左锁... 详细信息

抢救 1例因摩托车事故急诊入院男病人。X线胸片发现病人右气管旁外侧纹理和左纵隔影异常增宽 ,并扩展至主动脉弓水平。经食管心脏超声检查发现围绕主动脉根部和升主动脉的壁间水肿 ,延伸至主动脉弓和左横膈下水平的全程降主动脉 ;左锁骨下动脉起始点远端降主动脉上端全层断裂。急诊手术行降主动脉上端端端吻合 ,终因心跳骤停未及手术死亡。尸检证实全程胸主动脉自破裂处向前和逆向延伸 ,引起双向主动脉夹层。

关键词：降主动脉主动脉降部主动脉弓主动脉结 Traumatic aortic rupture mimicking intramural hematoma of the entire thoracic aorta

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Mein Dorf

德语人文研究 2008年第4期 9-12+8页

作者： erwin Strittmatter

Ich war nicht ganz sieben Jahre alt,da sah ich dieses Dorf zum ersten Male, und ich kam von drei Drfern *** saβauf dem von Onkel geborgten Ackerwagen und kutschierte einen *** mir saβmein Groβvater,und unter sein... 详细信息

关键词： der Mein Dorf