Sinet, Ethiopian Journal of Science最新文献_第7页

Some biological characteristics of Lymnaea trncatula and laboratory production of Fasciola hepatica metacercariae 肝片形吸虫囊蚴的一些生物学特性及实验室生产

Sinet, Ethiopian Journal of Science Pub Date : 2007-08-07 DOI: 10.4314/SINET.V29I2.18273

T. Eguale, G. Tilahun, G. Medhin

引用次数: 2

Abundance, length-weight relationship and breeding season of Clarias gariepinus (Teleostei: Clariidae) in Lake Tana, Ethiopia 衣索比亚塔纳湖加里宾Clarias gariepinus (Teleostei: Clariidae)丰度、长重关系及繁殖季节

Sinet, Ethiopian Journal of Science Pub Date : 2007-08-07 DOI: 10.4314/SINET.V29I2.18274

A. Ameha, B. Abdissa, T. Mekonnen

引用次数: 1

Unique determination of structure and velocity by 3-D tomographic inversion of reflected and refracted waves 通过反射波和折射波的三维层析反演，独特地确定结构和速度

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18256

T. Mammo

{"title":"Unique determination of structure and velocity by 3-D tomographic inversion of reflected and refracted waves","authors":"T. Mammo","doi":"10.4314/SINET.V29I1.18256","DOIUrl":"https://doi.org/10.4314/SINET.V29I1.18256","url":null,"abstract":"Accurate determinations of interface depths and velocity fields are crucial for the oil industries in their search for hydrocarbon reservoirs. However, the so called velocity-depth ambiguity has always been a problem with the seismic reflection data that is normally used in petroleum exploration. In this paper the cause of this velocity-depth ambiguity is examined and a methodology is proposed that minimizes non-uniqueness in the inversion results. It is shown that simultaneous inversion of zero offset and offset reflection data as well as refraction data can reproduce accurate velocity-depth model using only certain picked seismic events. A subsequent 2-D Prestack depth migration based on the Kirchhoff method utilizing the velocity field obtained from the tomographic inversion extracts more information from the data and gives a clear picture of the subsurface. The superiority of the simultaneous inversion of the reflected and refracted waves to that of reflected waves alone is demonstrated using real data. Keywords : inversion, non-uniqueness, pre-stack, tomography, velocity-depth ambiguity SINET: Ethiopian Journal of Science Vol. 29(1) 2006: 17–26","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"456 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115292475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distribution and abundance of rodents in farmlands: a case study in Alleltu Woreda, Ethiopia 农田中啮齿动物的分布和丰度:以埃塞俄比亚Alleltu wooreda为例

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18260

Manyingerew Shenkut, A. Mebrate, M. Balakrishnan

引用次数: 15

Genetic analysis on the competitive ability of barley ( Hordeum vulgare L.) recombinant inbred lines intercropped with oat ( Avena sativa L.) weeds 大麦(Hordeum vulgare L.)重组自交系间作燕麦(Avena sativa L.)杂草竞争能力的遗传分析

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18257

T. Tanto

{"title":"Genetic analysis on the competitive ability of barley ( Hordeum vulgare L.) recombinant inbred lines intercropped with oat ( Avena sativa L.) weeds","authors":"T. Tanto","doi":"10.4314/SINET.V29I1.18257","DOIUrl":"https://doi.org/10.4314/SINET.V29I1.18257","url":null,"abstract":"Ninety-eight barley recombinant inbred lines (RILs) were studied to determine oat weed competitive ability at Wageningen Agricultural University farm in 1997/98 summer season. The major objectives of the study were to determine: the influence of oat weed competition on the phenotype of barley lines, competitive ability with oat weeds, Quantitative Trait Loci (QTL) responsible for weed competition, and to study the correlation of competitive ability with yield and other agronomic characters. The most important characters determining competitive ability of barley lines were found to be plant height, droopy leaf type, thousand kernel-weight and grain yield (kg/ha). The QTLs identified for these characters revealed the molecular marker ‘erect gene' as an aid to select lines that are competitive with oat weeds. The QTLs identified are stable for these characters and are located on chromosome VII at position of 62.6 and 67.6 cM. Correlation analysis also showed that plant height and thousand-kernel weight were positively and moderately correlated with grain yield (kg/ha) in the intercrop environments. Selecting barley lines consisting of traits like droopy leaf type, taller, more number of seeds per ear, with better thousand kernel weight and grain yield (kg/ha) would enable one to determine environmentally friendly way of barley lines to withstand oat weed infestation which could easily be used in local communities. Furthermore, the commonly used herbicide price is soaring from time to time and out of the reach of the poor farmers in the developing countries. Therefore, this method is an alternative which uses a low input and environmentally friendly approach to withstand the oat-weed infestation problem. Keywords : barley lines, competitive ability, intercropping, oat-weed, quantitative trait loci SINET: Ethiopian Journal of Science Vol. 29(1) 2006: 27–44","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127047886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ETHNOBOTANY OF PLANTS USED AS INSECTICIDES, REPELLENTS AND ANTI- MALARIAL AGENTS IN JABITEHNAN DISTRICT, WEST GOJJAM 新疆西部贾比特南地区用作杀虫剂、驱虫剂和抗疟疾剂的植物的民族植物学

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18263

A. Berhan, Zemede Asfaw Z. Asfaw, E. Kelbessa

{"title":"ETHNOBOTANY OF PLANTS USED AS INSECTICIDES, REPELLENTS AND ANTI- MALARIAL AGENTS IN JABITEHNAN DISTRICT, WEST GOJJAM","authors":"A. Berhan, Zemede Asfaw Z. Asfaw, E. Kelbessa","doi":"10.4314/SINET.V29I1.18263","DOIUrl":"https://doi.org/10.4314/SINET.V29I1.18263","url":null,"abstract":"An ethnobotanical study on plants used for the prevention and treatment of malaria was conducted to document the indigenous knowledge particularly associated with the use and conservation of anti-malarial, insecticide and insect repellent medicinal plants. In this study, five sampling sites were selected based on the prevalence of malaria and availability of practitioners. Twenty five key informants were selected based on the comments from indigenous peoples, religious leaders and authorities. Moreover, 45 other informants were selected randomly by tossing a coin in their house or in working fields. Eight medicinal plants were found to be used as insecticides and insect repellents and 11 species as anti-malarial. Informants' consensus showed that 65.7 percent of the informants used Lepidium sativum for medicinal purposes followed by Croton macrostachyus (61.4 percent). The paired comparison showed that Allium sativum ranked first followed by Calpurnia aurea, C. macrostachyus, L. sativum and Phytolaca dodecandra for the treatment of malaria. On the other hand, the direct matrix ranking revealed that C. aurea ranked first followed by Dodonea angustifolia, C. macrostachyus, P. dodecandra and Gnidia involucrata . The study indicated that medicinal plants are at conservation risk because of suspected overuse and deforestation for settlement, agriculture and construction purposes. The introduction of proper management system in the society and encouraging practitioners to use medicinal plants sustainably can serve as a tool for the conservation of medicinal plants. SINET: Ethiopian Journal of Science Vol. 29(1) 2006: 87–92","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129526918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 35

ETHNOBOTANICAL STUDY OF FOOD PLANTS AROUND 'DHEERAA' TOWN, ARSI, ETHIOPIA 埃塞俄比亚arsi ' dheeraa '镇附近食用植物的民族植物学研究

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18261

T. Wondimu, Zemede Asfaw Z. Asfaw, E. Kelbessa

{"title":"ETHNOBOTANICAL STUDY OF FOOD PLANTS AROUND 'DHEERAA' TOWN, ARSI, ETHIOPIA","authors":"T. Wondimu, Zemede Asfaw Z. Asfaw, E. Kelbessa","doi":"10.4314/SINET.V29I1.18261","DOIUrl":"https://doi.org/10.4314/SINET.V29I1.18261","url":null,"abstract":"A study aimed at identifying plant species used and manipulated by the community for food was carried out around ‘Dheeraa' town, in Arsi Zone of Oromia National Regional state, Ethiopia. The data were collected through four round fieldworks co nducted from October to December 2003. Random and systematic sampling methods were employed to select the study sites as well as the informants. Ethnobotanical methods using semi-structured interviews were employed to collect data on food plants used by the community. In this study, 71 species of food plants were recorded of which, the local people cultivate 30 species. Wild edible plant species claimed a larger proportion (41 species, 58%) of the total records. Of the edible plants of the study area 16 species used by the community in traditional medicine, are categorized as nutraceuticals. The non-cultivated food plants are very rare in the area and this might be attributed to the ongoing habitat modification and loss of natural vegetation. It is important to create awareness on sustainable use of wild edibles and the cultivated food. On top of the benefits that these food plants offer as part of the local vegetation, their potentials as food sources are worth considering in efforts towards realizing household food self-sufficiency in the study area. SINET: Ethiopian Journal of Science Vol. 29(1) 2006: 71–80","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"16 29","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114044593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

The undifferentiated afromontane forest of Denkoro in the central highland of Ethiopia: a floristic and structural analysis 埃塞俄比亚中部高地登科罗的未分化非山地森林:植物区系和结构分析

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18258

Abate Ayalew, T. Bekele, S. Demissew

{"title":"The undifferentiated afromontane forest of Denkoro in the central highland of Ethiopia: a floristic and structural analysis","authors":"Abate Ayalew, T. Bekele, S. Demissew","doi":"10.4314/SINET.V29I1.18258","DOIUrl":"https://doi.org/10.4314/SINET.V29I1.18258","url":null,"abstract":"The floristic composition and vegetation structure of Denkoro forest, South Wello Zone of Amhara Region, N. Ethiopia, were described during November–December, 2002. A total of 95 sample plots were analysed, and 174 species of vascular plants representing 66 families were recorded. Out of these, 41 species were new records reported for the first time from Wello. Eleven endemic species, which are included in the IUCN Red List categories, have been recorded. Based on the results of vegetation classification, six clusters were recognized and designated as local plant community types: 1) Erica arborea - Hypericum revolutum, 2) Myrsine melanophloeos - Dombeya torrida, 3) Myrsine africana – Maesa lanceolata – Prunus africana, 4) Olinia rochetiana – Olea europaea, 5) Olinia rochetiana – Allophylus abyssinicus – Apodytes dimidiata , and 6) Maytenus gracilipes – Teclea nobilis. Structural analysis of the forest showed the density of individuals > 10 cm DBH to be almost twice as that of individuals with DBH >20 cm. A higher proportion of woody individuals (ca. 65%) fell in the low height classes (i.e., SINET: Ethiopian Journal of Science Vol. 29(1) 2006: 45–56","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116244070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 59

Design chart procedures for polygonal concrete-filled steel columns under uniaxial bending 单轴弯曲下多边形钢混凝土柱的设计图程序

Sinet, Ethiopian Journal of Science Pub Date : 2006-10-12 DOI: 10.4314/SINET.V29I1.18255

E. Ketema, S. Taye

引用次数: 2

A study on abundance, group size and composition of Soemmering's Gazelle ( Gazella soemmerringii ) in Awash National Park and Alledeghi Wildlife Reserve, Ethiopia 埃塞俄比亚阿瓦什国家公园和阿勒德吉野生动物保护区苏默林瞪羚(Gazella soemmerringii)丰度、种群大小和组成的研究

Sinet, Ethiopian Journal of Science Pub Date : 2006-04-12 DOI: 10.4314/SINET.V28I2.18252

B. Gebremedhin, S. Yirga

{"title":"A study on abundance, group size and composition of Soemmering's Gazelle ( Gazella soemmerringii ) in Awash National Park and Alledeghi Wildlife Reserve, Ethiopia","authors":"B. Gebremedhin, S. Yirga","doi":"10.4314/SINET.V28I2.18252","DOIUrl":"https://doi.org/10.4314/SINET.V28I2.18252","url":null,"abstract":"Population status, group composition and social organization of the Soemmerring's gazelle ( Gazella soemmeringii ) were studied at Awash National Park (ANP) and Alledeghi Wildlife Reserve (AWR) in 2000. Total count method was used to assess the population size of the gazelle. Thirteen routes, each route being two kilometres away from the other, were designated at AWR for the vehicle survey. Similarly, 10 routes, each being one kilometre away from the other, were designated at ANP. The results revealed a mean population of 457.8 individuals in the selected study site in Alledeghi Wildlife Reserve, and 41.45 in Ilala Sala. Grouping pattern showed that cohesion was stronger. The large females group containing juveniles and of adult males were the two main social units. Mean group size in ANP was 4.4 whereas that of AWR was 16.8 individuals (p>0.001). A paired-sample t-test comparison of the total frequency of categories of the group sizes for the two areas showed a significant difference (p=0.026). Local variation in group size did exist in AWR (p=0.021). But this variable showed no significant difference (p= 0.414) in ANP. Herds of 6–10 were most common at Ilala Sala and 20–50 at AWR. However, herd size ranges from 3–250 individuals at AWR. Comparing seasonal variations in group sizes showed no significant difference. It is presumed that alteration of the original habitats might have an effect on the group pattern and social organization of study population as observed from one of the study site. Keywords : abundance, Alledeghi Wildlife Reserve, Awash National Park, group size, Soemmerring's gazelle SINET: Ethiopian Journal of Science Vol. 28(2) 2005: 161-170","PeriodicalId":245987,"journal":{"name":"Sinet, Ethiopian Journal of Science","volume":"360 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116689870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5