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Search Results: 1 - 10 of 209 matches for " Southgate VR "
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Studies on the biology of schistosomiasis with emphasis on the Senegal river basin
Southgate VR,Tchuem Tchuenté L-A,Sène M,De Clercq D
Memórias do Instituto Oswaldo Cruz , 2001,
Abstract: The construction of the Diama dam on the Senegal river, the Manantali dam on the Bafing river, Mali and the ensuing ecological changes have led to a massive outbreak of Schistosoma mansoni in Northern Senegal, associated with high intensity of infections, due to intense transmission, and the creation of new foci of S. haematobium. Data on the vectorial capacity of Biomphalaria pfeifferi from Ndombo, near Richard Toll, Senegal are presented with sympatric and allopatric (Cameroon) S. mansoni. Comparisons are made on infectivity, cercarial production, chronobiology of cercarial emergence and longevity of infected snails. Recent data on the intermediate host specificity of different isolates of S. haematobium from the Lower and Middle Valley of the Senegal river basin (SRB) demonstrate the existence of at least two strains of S. haematobium. The role of Bulinus truncatus in the transmission of S. haematobium in the Lower and Middle Valleys of the SRB is reviewed. Both S. haematobium and S. mansoni are transmitted in the same foci in some areas of the SRB.
Deforestation, Agrarian Reform and Oil Development in Ecuador, 1964-1994  [PDF]
Robert Wasserstrom, Douglas Southgate
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.41004
Abstract:

Recent biodiversity research in the Western Amazon has emphasized the linkages among road construction, deforestation and loss of indigenous lands. Many observers have concluded that hydrocarbon production inevitably means destruction of forests and expropriation of native territory. Yet evidence from the eastern lowlands of Ecuador (known as the Oriente) shows that oil can be developed without roads or harmful impacts. The Oriente also provides another contrasting case: in areas where no oil was discovered, the government often built roads to support its agricultural colonization efforts. In these areas, a great deal of deforestation and indigenous displacement occurred. Such evidence suggests that a different set of agrarian and environmental policies might permit oil activity without loss of rain forest or indigenous territory.

 

Studies on the biology of schistosomiasis with emphasis on the Senegal river basin
Southgate, VR;Tchuem Tchuenté, L-A;Sène, M;De Clercq, D;Théron, A;Jourdane, J;Webster, BL;Rollinson, D;Gryseels, B;Vercruysse, J;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000900010
Abstract: the construction of the diama dam on the senegal river, the manantali dam on the bafing river, mali and the ensuing ecological changes have led to a massive outbreak of schistosoma mansoni in northern senegal, associated with high intensity of infections, due to intense transmission, and the creation of new foci of s. haematobium. data on the vectorial capacity of biomphalaria pfeifferi from ndombo, near richard toll, senegal are presented with sympatric and allopatric (cameroon) s. mansoni. comparisons are made on infectivity, cercarial production, chronobiology of cercarial emergence and longevity of infected snails. recent data on the intermediate host specificity of different isolates of s. haematobium from the lower and middle valley of the senegal river basin (srb) demonstrate the existence of at least two strains of s. haematobium. the role of bulinus truncatus in the transmission of s. haematobium in the lower and middle valleys of the srb is reviewed. both s. haematobium and s. mansoni are transmitted in the same foci in some areas of the srb.
Comment on “An incidental finding of the accessory inferior thyroid artery”
Vollala VR
International Journal of Anatomical Variations , 2008,
Abstract: To the Editor, International Journal of Anatomical Variations:I read the recently published article “An incidental finding of the accessory inferior thyroid artery” by Jiri Sedy [1] with keen interest and found the article very enlightening. The authors have provided useful information regarding the variant thyroid artery, which will be helpful for the anatomists and mostly surgeons working on thyroid area.The anatomy of inferior thyroid arteries is variable. These paired arteries even be absent on one or both sides in about 0.2 to 6% of cases [2-6]. The inferior thyroid artery when usually small or absent may be replaced or supplemented by thyroidea ima artery or if it is absent on both sides; on the right side it may be replaced by an artery branching off from the right internal thoracic artery and on the left side by an artery, a branch of vertebral artery [3]. During routine dissection, Moriggl & Oturm found out the absence of both inferior thyroid arteries and right superior thyroid artery in a 7-year old female donor. In this case a large lowest thyroid artery took origin from the left internal thoracic artery to supply the thyroid gland [4]. A study by Ramesh Rao et al. showed absence of both inferior thyroid arteries and both superior thyroid arteries solely supplied the thyroid tissue by giving superior and inferior branches [5].Even though origin of accessory inferior thyroid artery from the thyrocervical trunk is rare, there are reports in the literature [7,8]. To my opinion the paper by Jiri Sedy [1] was informative and addition of these points will strengthen the article.
Learning with the community. Evolution to transformative action research.
Ramsden VR
Canadian Family Physician , 2003,
Abstract:
Permanent Grasslands in an Anthropogenically Burdened Region, and Their Contribution to Sustainable Development  [PDF]
Jaroslava Vráblíková, Petr Vráblík, Eli?ka Wildová, Miloslav ?och
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.88060
Abstract: The landscape of the northern part of the Czech Republic (the Chomutov, Most, Teplice and ústí nad Labem districts) has long been burdened by the surface mining of brown coal. Within the reclamation and restoration processes, the anthropogenic formations which were created have been successfully integrated into the surrounding landscape. One of the important regional elements which have been utilized during the regeneration is permanent grasslands (PGL). They are of considerable importance not only for cattle grazing, but also for the preservation of the region’s biodiversity and protection of the soil. The contribution deals with the production and non-production functions of permanent grasslands in the landscape, and their significance within the scope of the permanently sustainable development of an anthropogenically burdened region. Permanent grasslands are part of the agricultural landscape, but their significance is multifunctional, because they not only provide an environment for cattle grazing, but also protect soil, the nutrient cycle and the microclimate, and preserve biodiversity. At the same time, the article analyzes in detail the development of this vegetation in the area of interest-Northern Bohemia. During the period of the greatest mining boom (1967-1990), its rapid decrease-by as much as 4500 ha-was recorded in some areas. Since the year 1990, there has been a significant growth in the most damaged areas. At present, the development of PGLs has stabilized.
Changes in Physical and Chemical Soil Characteristics as a Result of Subsurface Tile Drainage  [PDF]
Jan Vopravil, Tomá? Khel, Petr Vráblík, Jaroslava Vráblíková
Open Journal of Soil Science (OJSS) , 2017, DOI: 10.4236/ojss.2017.712026
Abstract: This project defined changes in soil properties after construction of subsurface tile drainage. We compared the physical and chemical properties of soil samples taken before construction of drainage and new soil samples taken from identical sites at present. The research was made for Stagnic Cambisols (Dystric) and Haplic Stagnosols. The pH value and saturation of the topsoil sorption complex of both soil types statistically increased and simultaneously the cation exchange capacity (CEC) decreased. In the topsoil of Stagnosols, the effective cation exchange capacity and porosity also decreased, and at the same time the particle density and bulk density increased. Soil organic matter and minimum air capacity increased in the topsoil of Cambisols. Porosity and minimum air capacity increased in both soils in the subsoil. In the Cambisol subsoil, the CEC and bulk density decreased. We can assume that after drainage Stagnosols are susceptible to soil compaction, especially in topsoil.
Sorbent Mineralogy in the Most Basin and Their Utilization for Reclamation Works  [PDF]
Michal ?eho?, Petr Vráblík, Jaroslava Vráblíková, Luká? ?i?ka
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.712118
Abstract: The contribution is focused on the relation between sorptive efficiency, mineral structure, and reclamation extraction of clay sorbents originating from the Most Basin. Clay sorbents are an important accessory raw material that occurs on several localities in the North Bohemian Brown Coal Basin, which are briefly described in the first part of the paper. The results from clay sorbents were obtained by mineralogy survey based on a diffract analysis with a D 5000 Siemens X-ray diffractometer. Localities, where zeolites and montmorillonites were found, are the main subjects of the research. The results show that parameters of clay sorbents mined in these localities are suitable for reclamation works. A successful reclamation with the use of bentonites is demonstrated on Strimice dump.
Economic Development of an Area Burdened by the Surface Mining of Brown Coal, with Regard to the Principle of Sustainable Development  [PDF]
Petr Vráblík, Jaroslava Vráblíková, Eli?ka Wildová
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.812101
Abstract: The article deals with an analysis of the economic development of an area which has been burdened with the surface mining of brown coal over a long period. It is an area in the northern part of the Czech Republic (Most Basin). The contribution mainly deals with the economic perspective, which is closely linked to the region’s social and environmental conditions. For the purposes of compiling the contribution, it was necessary to utilize materials relating to sustainable development and prepared statistical analyses together with the authors’ practical experiences. The model area has an unemployment rate which is among the highest in the Czech Republic (8.2%); however, it is the lowest in the last 2 years. The demographic situation contends with an ageing population and the migration of productive inhabitants inland in the direction of the capital. At the same time, there is a large proportion of socially disadvantaged people here. However, the geographic location enables cross-border cooperation with neighboring Germany and, thanks partly to updated infrastructure, a better connection is possible. GDP is currently at the level of CZK 275,214 (EUR 10,089). It has increased compared to previous years. The region’s potential lies mainly in new recreational areas, which will be created within the scope of reclamation after mining, and which will strengthen tourism and the service sector. After mining ends, around 2055, the transition to a renewable energy source will mean a further investment. Despite the negative image of the area of interest, particularly in terms of pollution as a result of mining, it is a region with the potential for sustainable economic development.
Future of Renewable Resources in an Area Burdened by Brown Coal Mining  [PDF]
Jaroslava Vráblíková, Petr Vráblíková, Eli?ka Wildová, Miroslava Blazková
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.812046
Abstract:
This contribution is focused on a possible utilization of renewable energy resources in the Podkrušnohoří?region (Chmomutov, Most, Teplice, ústí nad Labem districts) in the northern part of the Czech Republic after the end of brown coal mining in 2055. Results of the research describe current share of renewable energy resources (solar, wind, water, biogas) in the model area, and a future energy potential in order to ensure sustainable development of an anthropogenically burdened region. Aim of this contribution is to determine, which renewable energy resources would be the most suitable for energy production after the end of brown coal mining. It also describes current and possible use of geothermal power as there are registered heat flow anomalies in the area.
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