This paper presents the results of petrographic study of sedimentary iron ore from surface strata of the Shendi-Atbara Basin,River Nile State,Sudan.The aims of this study are to investigate the geological behavior and...This paper presents the results of petrographic study of sedimentary iron ore from surface strata of the Shendi-Atbara Basin,River Nile State,Sudan.The aims of this study are to investigate the geological behavior and geological conditions affecting precipitation of sedimentary iron ore.The methodologies have been used to realize the objectives of this study include field work,office work and laboratory work including thin sections and polished sections analysis.According to field observation sedimentary iron ore can broadly be considered as occurring in three major classes:Ferribands iron,ferricrete iron and oolitic iron ores.The modes of occurrence of iron ore were described at the outcrops and vertical sedimentary profiles revealed that the iron occurred in the study area at different types in stratigraphic sequence such as cap,bedded and interbedded conformable with Shendi Formation.Petrographic study of iron ore in collected samples using polarized microscope and ore microscope includes study of the textures and structures of ores to obtain ore history.The main types of textures and structures in studied samples are oolitic,granular,lamellar and bands.According to these results the origin of iron ore is formed by chemical precipitation during chemical weathering of surrounding areas in continental lacustrine environment.The iron ore in study area is potential for future mining works and steel industry.展开更多
Objective:To evaluate the situation regarding gastrointestinal helminth parasites in ruminants (cattle, sheep and goats) slaughtered in the abattoir of Shendi, River Nile State, Sudan. Methods: From September 2015 to ...Objective:To evaluate the situation regarding gastrointestinal helminth parasites in ruminants (cattle, sheep and goats) slaughtered in the abattoir of Shendi, River Nile State, Sudan. Methods: From September 2015 to October 2016, a total of 687 fecal samples were collected and analyzed by flotation and sedimentation techniques. Results: A total of 411 ruminants examined were positive with one or more helminths, giving 59.8% overall prevalence with intensity of 548.23 eggs per gram feces. A total of 12 gastrointestinal helminth parasite genera were identified, including 2 trematodes (Fasciola spp. and Paramphistomum spp.);7 nematodes (Haemonchus spp.,Strongyloides spp., Trichostrongylus sp.,Ostertagia sp.,Ascaris spp.,Nematodirus spp., and Dictyocaulus sp.);and 3 cestodes (Moniezia sp.,Taenia spp., and Dipylidium sp.). Prevalence of Taenia spp. infection was the highest, whereas Trichostrongylus sp. and Dictyocaulus sp. infections had the lowest prevalences. Adult ruminants had higher infection prevalence than the younger ones, but this difference was not statistically significant (P > 0.05). On the other hand, male ruminants had significantly higher infection prevalence than the females (P < 0.05). Helminth prevalence was significantly higher during the rainy season than the dry season. The highest mean egg outputs were recorded for the young and the female ruminants. Likewise, the mean egg output of helminth was higher during the dry than the rainy season, with a significant difference (P < 0.05). Conclusions: These results encourage implementation of effective preventive and control measures directed against the parasites of ruminants throughout the country.展开更多
文摘This paper presents the results of petrographic study of sedimentary iron ore from surface strata of the Shendi-Atbara Basin,River Nile State,Sudan.The aims of this study are to investigate the geological behavior and geological conditions affecting precipitation of sedimentary iron ore.The methodologies have been used to realize the objectives of this study include field work,office work and laboratory work including thin sections and polished sections analysis.According to field observation sedimentary iron ore can broadly be considered as occurring in three major classes:Ferribands iron,ferricrete iron and oolitic iron ores.The modes of occurrence of iron ore were described at the outcrops and vertical sedimentary profiles revealed that the iron occurred in the study area at different types in stratigraphic sequence such as cap,bedded and interbedded conformable with Shendi Formation.Petrographic study of iron ore in collected samples using polarized microscope and ore microscope includes study of the textures and structures of ores to obtain ore history.The main types of textures and structures in studied samples are oolitic,granular,lamellar and bands.According to these results the origin of iron ore is formed by chemical precipitation during chemical weathering of surrounding areas in continental lacustrine environment.The iron ore in study area is potential for future mining works and steel industry.
文摘Objective:To evaluate the situation regarding gastrointestinal helminth parasites in ruminants (cattle, sheep and goats) slaughtered in the abattoir of Shendi, River Nile State, Sudan. Methods: From September 2015 to October 2016, a total of 687 fecal samples were collected and analyzed by flotation and sedimentation techniques. Results: A total of 411 ruminants examined were positive with one or more helminths, giving 59.8% overall prevalence with intensity of 548.23 eggs per gram feces. A total of 12 gastrointestinal helminth parasite genera were identified, including 2 trematodes (Fasciola spp. and Paramphistomum spp.);7 nematodes (Haemonchus spp.,Strongyloides spp., Trichostrongylus sp.,Ostertagia sp.,Ascaris spp.,Nematodirus spp., and Dictyocaulus sp.);and 3 cestodes (Moniezia sp.,Taenia spp., and Dipylidium sp.). Prevalence of Taenia spp. infection was the highest, whereas Trichostrongylus sp. and Dictyocaulus sp. infections had the lowest prevalences. Adult ruminants had higher infection prevalence than the younger ones, but this difference was not statistically significant (P > 0.05). On the other hand, male ruminants had significantly higher infection prevalence than the females (P < 0.05). Helminth prevalence was significantly higher during the rainy season than the dry season. The highest mean egg outputs were recorded for the young and the female ruminants. Likewise, the mean egg output of helminth was higher during the dry than the rainy season, with a significant difference (P < 0.05). Conclusions: These results encourage implementation of effective preventive and control measures directed against the parasites of ruminants throughout the country.
