Introduction: since its creation, our urology department has taken care of tumor pathologies in particular kidney cancer in adults;our goal is to study the clinical and therapeutic epidemiological profiles of adult ki...Introduction: since its creation, our urology department has taken care of tumor pathologies in particular kidney cancer in adults;our goal is to study the clinical and therapeutic epidemiological profiles of adult kidney cancer in Mauritania. Materials and Methods: We carried out a retrospective study over a period of six years, from January 1, 2012 to December 31, 2017, including all cases of adult kidney cancer registered in the urology-andrology departments of the Cheikh Zayed Hospital and Pathological Anatomy of the National Hospital of Nouakchott (Mauritania). Results: we collected 50 cases of kidney cancer. The average annual incidence was 8.3 cases. The average age of the patients was 52.98 years with extremes of 18 and 84 years. There was a female predominance (52%) or 29 women for 21 men. Lumbar pain was the most frequent clinical expression, more than half of the patients had symptoms over a period of at least 12 months before the first consultation. The left kidney was the most frequently affected. The right localization was demonstrated in 23 patients, the extension assessment was made with thoraco-abdomino-pelvic CT in 40 patients. Twelve patients had a tumor localized in the kidney. The extension assessment had made it possible to objectify the existence of metastases in 17 of our patients (37%). The preferred locations of these metastases were pulmonary and hepatic. Surgical intervention was performed in 44 patients (88%), of whom 36 underwent radical nephrectomy (72%), and two patients underwent partial nephrectomy (4.5%). Surgical abstention was decided from the outset in 6 patients (13.6%). None of our patients had received treatment with anti-angiogenics. The histological type most observed in our patients was renal cell carcinoma, observed in 34 patients, or 77.72%. At the time of the study, more than a third of the patients had died. The mortality rate in our series had reached 24%. A specific survival rate could not be assessed due to lack of information in the files and significant numbers展开更多
拟海底反射层(Bottom Simulating Reflector,简称BSR)是水合物底界的地震反射标志,其上部的振幅空白带是含水合物地层的反射特征,下部的高振幅异常区代表了下伏的游离气区(Free Gas Zones,简称FGZs)。利用高分辨率三维地震资料,精细描...拟海底反射层(Bottom Simulating Reflector,简称BSR)是水合物底界的地震反射标志,其上部的振幅空白带是含水合物地层的反射特征,下部的高振幅异常区代表了下伏的游离气区(Free Gas Zones,简称FGZs)。利用高分辨率三维地震资料,精细描述了毛里塔尼亚滨海地区的BSR和FGZs的地震反射特征及其与周边沉积构造单元的关系。BSR在底辟构造上部出现上拱现象,在靠近峡谷两壁时BSR位置快速变深。据分析,在底辟构造带,沿断裂体系向上运移的热流体改变了此处的水合物稳定条件,导致水合物稳定底界向上变浅。而峡谷对周边沉积物的冷却作用使当地的水合物稳定条件发生与底辟构造带处相反的变化,导致水合物稳定底界向下发生移动,在地震上表现为BSR深度的增加。另外,研究发现BSR和FGZs在流体运移通道较发育的地区,如断层、气烟囱和底辟构造带地区更加发育,证明流体运移体系在该地区对水合物和FGZs的形成具有十分重要的作用,提供了水合物体系的气源供给。展开更多
In this study,the effects of chemical refining on the physicochemical indices,environmental pollutants,lipid functional groups,relaxation characteristics,fatty acid profiles,and triglyceride(TG)molecular species in cr...In this study,the effects of chemical refining on the physicochemical indices,environmental pollutants,lipid functional groups,relaxation characteristics,fatty acid profiles,and triglyceride(TG)molecular species in crude oil extracted from small fish in Mauritania were evaluated.The acid,peroxide,and iodine values of crude oil were identified as 5.52 mg KOH/g,1.73 meq/kg,and 200.78 g/100 g oil,respectively.After refining,these values were determined to be 0.29 mg KOH/g,0.76 meq/kg,and 210.80 g/100 g oil,respectively.The polychlorinated biphenyls and arsenic content of crude oil were identified as 32.30μg/kg and 1.00 mg/kg,respectively.After refining,these were not detected.The content of eicosapentaenoic acid(EPA)and docosahexaenoic acid(DHA)accounted for as much as 87.55%of the polyunsaturated fatty acids in the refined oil,indicating that high-quality fish oil is suitable as a food supplement.The correlation coefficient of the infrared spectra before and after refining was 0.968,and the relaxation time and peak shape data were almost similar before and after purification.Meanwhile,there were no significant differences(P≥0.05)in fatty acid profiles between the crude and refined oils,except for C16:0(P<0.01).Based on UPLC-Q E-MS/MS detection,137 TG molecules were identified in both crude and refined oils.Among the detected TG molecular species,64 contained EPA or DHA,which accounted for 46.83%and 46.00%of the total TG content in crude and refined oils,respectively.After refining,the content of the molecular species decreased by 31.95 mg/10 g,among which the three most variable molecular species were TG(16:0/18:1/22:6),(16:1/16:2/18:1),and(18:4/16:0/20:5),accounting for 29.26%of the decline of the molecular species.Overall,the refining process had little effect on the fatty acid profile and distribution of TG molecular species in fish oil.展开更多
Most countries’ land use and land cover (LULC) are changing dramatically today. Most of these changes are related to the way humans and the environment interact. Various methodologies and data sources have been used ...Most countries’ land use and land cover (LULC) are changing dramatically today. Most of these changes are related to the way humans and the environment interact. Various methodologies and data sources have been used in conjunction with remote sensing (RS) to categorize and map changes in LULC. This study used RS and Geographic Information System (GIS) tools to analyze LULC change and transitions from 1984 to 2022 in a tropical forested landscape in southwest Mauritania. Using a suitable and high-quality collection of Landsat satellite images. For the classification and creation of LULC maps for the selected periods, the supervised technique using a maximum likelihood classifier was used. The results indicated that there was a remarkable change in all classes of LULC, with an increase in all classes, except barren land, which had a tremendous decrease of −68.58% for the total study area. Therefore, for the total study area, an increase in agricultural land (221%), water bodies (118.46%), vegetation (57.50%), and built-up areas (14.65%) was observed. We believe that by informing policymakers, environmental managers, and the general public about the current changes, our study will help the region to establish appropriate land use rules that may lead to policy document development.展开更多
Trauma care including abdominal trauma is a big challenge. It is associated with high morbidity and mortality and continues to be a public health problem worldwide. The main aims of our study were to assess the patter...Trauma care including abdominal trauma is a big challenge. It is associated with high morbidity and mortality and continues to be a public health problem worldwide. The main aims of our study were to assess the patterns and outcomes of our patients, and to describe our experience in management of abdominal trauma. This descriptive retrospective study was conducted in general surgery department at National Centre Hospital of Nouakchott in Mauritania. We recruited patients presented at our department with abdominal trauma (2012-2016). Out of 100 cases, 92% were men. Mean age: 22.78 years (5 - 70 years). Eighty percent of patients suffered of penetrating abdominal trauma. Stab injuries were the most frequent mechanism (60%). The commonest organ injury was small intestine (16%). Mortality has been strongly related to road traffic accidents. Cares of severe abdominal traumas are not common in our hospital, due to lack of required overall data. Emergency health system is needed to better care of trauma patients in Mauritania.展开更多
<strong>Introduction: </strong>Tracheotomy is a commonly performed procedure, but with very large disparities according to the teams, both in terms of frequency and modality (percutaneous or surgical), tra...<strong>Introduction: </strong>Tracheotomy is a commonly performed procedure, but with very large disparities according to the teams, both in terms of frequency and modality (percutaneous or surgical), tracheotomy has been evolved with medical advances. The objective of this study was to clarify the indications and complications of emergency tracheotomies at the National hospital center (CHN) in Nouakchott Mauritania. <strong>Materials and Methods: </strong>It is a retrospective study of tracheotomies performed in the ENT department of the CHN during the period from January 1, 2010 to December 31, 2018. The indications and complications were noted, as well as the modalities and time of decannulation. <strong>Results:</strong> Tracheotomy was motivated by upper airway obstruction (UAO) in 139 (94%) cases (mean age 32.5 years), or the need for prolonged ventilation in 8 patients (median age 46 years). Sixteen (7%) early complications were noted with 5 untimely decannulations including one fatal and 5 obstructive plug responsible for another death. Six pneumothorax was observed. Fifteen (26%) late complications required additional surgery;7% (n = 11) of patients were decannulated with a mean duration of tracheotomy 26 months. In 19 (28%) cases of decannulations, the persistence of a tracheocutaneous fistula required surgery. <strong>Conclusion:</strong> Emergency tracheotomy is a survival gesture that is sure to be effective. A tracheotomy is not deprived of complications. Familiarity with the technique, the right choice of equipment, perfect knowledge of the anatomical relationships of the trachea, rigorous monitoring and postoperative care represent the main conditions for minimizing the risk of complications.展开更多
Lipomas are the most common fatty mesenchymal tumors in the human body. They are very rare in the oral cavity. With a predilection, they have a rate of 1% to 4%. We report the case of a 74-year-old woman with a large ...Lipomas are the most common fatty mesenchymal tumors in the human body. They are very rare in the oral cavity. With a predilection, they have a rate of 1% to 4%. We report the case of a 74-year-old woman with a large painless lump on the left cheek of the mouth. This mass invading the deep spaces of the face induced a more difficult surgical excision.展开更多
文摘Introduction: since its creation, our urology department has taken care of tumor pathologies in particular kidney cancer in adults;our goal is to study the clinical and therapeutic epidemiological profiles of adult kidney cancer in Mauritania. Materials and Methods: We carried out a retrospective study over a period of six years, from January 1, 2012 to December 31, 2017, including all cases of adult kidney cancer registered in the urology-andrology departments of the Cheikh Zayed Hospital and Pathological Anatomy of the National Hospital of Nouakchott (Mauritania). Results: we collected 50 cases of kidney cancer. The average annual incidence was 8.3 cases. The average age of the patients was 52.98 years with extremes of 18 and 84 years. There was a female predominance (52%) or 29 women for 21 men. Lumbar pain was the most frequent clinical expression, more than half of the patients had symptoms over a period of at least 12 months before the first consultation. The left kidney was the most frequently affected. The right localization was demonstrated in 23 patients, the extension assessment was made with thoraco-abdomino-pelvic CT in 40 patients. Twelve patients had a tumor localized in the kidney. The extension assessment had made it possible to objectify the existence of metastases in 17 of our patients (37%). The preferred locations of these metastases were pulmonary and hepatic. Surgical intervention was performed in 44 patients (88%), of whom 36 underwent radical nephrectomy (72%), and two patients underwent partial nephrectomy (4.5%). Surgical abstention was decided from the outset in 6 patients (13.6%). None of our patients had received treatment with anti-angiogenics. The histological type most observed in our patients was renal cell carcinoma, observed in 34 patients, or 77.72%. At the time of the study, more than a third of the patients had died. The mortality rate in our series had reached 24%. A specific survival rate could not be assessed due to lack of information in the files and significant numbers
文摘拟海底反射层(Bottom Simulating Reflector,简称BSR)是水合物底界的地震反射标志,其上部的振幅空白带是含水合物地层的反射特征,下部的高振幅异常区代表了下伏的游离气区(Free Gas Zones,简称FGZs)。利用高分辨率三维地震资料,精细描述了毛里塔尼亚滨海地区的BSR和FGZs的地震反射特征及其与周边沉积构造单元的关系。BSR在底辟构造上部出现上拱现象,在靠近峡谷两壁时BSR位置快速变深。据分析,在底辟构造带,沿断裂体系向上运移的热流体改变了此处的水合物稳定条件,导致水合物稳定底界向上变浅。而峡谷对周边沉积物的冷却作用使当地的水合物稳定条件发生与底辟构造带处相反的变化,导致水合物稳定底界向下发生移动,在地震上表现为BSR深度的增加。另外,研究发现BSR和FGZs在流体运移通道较发育的地区,如断层、气烟囱和底辟构造带地区更加发育,证明流体运移体系在该地区对水合物和FGZs的形成具有十分重要的作用,提供了水合物体系的气源供给。
基金the“National Key Research and Development Program of China”(Project NO.2016YFD0400202-8).
文摘In this study,the effects of chemical refining on the physicochemical indices,environmental pollutants,lipid functional groups,relaxation characteristics,fatty acid profiles,and triglyceride(TG)molecular species in crude oil extracted from small fish in Mauritania were evaluated.The acid,peroxide,and iodine values of crude oil were identified as 5.52 mg KOH/g,1.73 meq/kg,and 200.78 g/100 g oil,respectively.After refining,these values were determined to be 0.29 mg KOH/g,0.76 meq/kg,and 210.80 g/100 g oil,respectively.The polychlorinated biphenyls and arsenic content of crude oil were identified as 32.30μg/kg and 1.00 mg/kg,respectively.After refining,these were not detected.The content of eicosapentaenoic acid(EPA)and docosahexaenoic acid(DHA)accounted for as much as 87.55%of the polyunsaturated fatty acids in the refined oil,indicating that high-quality fish oil is suitable as a food supplement.The correlation coefficient of the infrared spectra before and after refining was 0.968,and the relaxation time and peak shape data were almost similar before and after purification.Meanwhile,there were no significant differences(P≥0.05)in fatty acid profiles between the crude and refined oils,except for C16:0(P<0.01).Based on UPLC-Q E-MS/MS detection,137 TG molecules were identified in both crude and refined oils.Among the detected TG molecular species,64 contained EPA or DHA,which accounted for 46.83%and 46.00%of the total TG content in crude and refined oils,respectively.After refining,the content of the molecular species decreased by 31.95 mg/10 g,among which the three most variable molecular species were TG(16:0/18:1/22:6),(16:1/16:2/18:1),and(18:4/16:0/20:5),accounting for 29.26%of the decline of the molecular species.Overall,the refining process had little effect on the fatty acid profile and distribution of TG molecular species in fish oil.
文摘Most countries’ land use and land cover (LULC) are changing dramatically today. Most of these changes are related to the way humans and the environment interact. Various methodologies and data sources have been used in conjunction with remote sensing (RS) to categorize and map changes in LULC. This study used RS and Geographic Information System (GIS) tools to analyze LULC change and transitions from 1984 to 2022 in a tropical forested landscape in southwest Mauritania. Using a suitable and high-quality collection of Landsat satellite images. For the classification and creation of LULC maps for the selected periods, the supervised technique using a maximum likelihood classifier was used. The results indicated that there was a remarkable change in all classes of LULC, with an increase in all classes, except barren land, which had a tremendous decrease of −68.58% for the total study area. Therefore, for the total study area, an increase in agricultural land (221%), water bodies (118.46%), vegetation (57.50%), and built-up areas (14.65%) was observed. We believe that by informing policymakers, environmental managers, and the general public about the current changes, our study will help the region to establish appropriate land use rules that may lead to policy document development.
文摘Trauma care including abdominal trauma is a big challenge. It is associated with high morbidity and mortality and continues to be a public health problem worldwide. The main aims of our study were to assess the patterns and outcomes of our patients, and to describe our experience in management of abdominal trauma. This descriptive retrospective study was conducted in general surgery department at National Centre Hospital of Nouakchott in Mauritania. We recruited patients presented at our department with abdominal trauma (2012-2016). Out of 100 cases, 92% were men. Mean age: 22.78 years (5 - 70 years). Eighty percent of patients suffered of penetrating abdominal trauma. Stab injuries were the most frequent mechanism (60%). The commonest organ injury was small intestine (16%). Mortality has been strongly related to road traffic accidents. Cares of severe abdominal traumas are not common in our hospital, due to lack of required overall data. Emergency health system is needed to better care of trauma patients in Mauritania.
文摘<strong>Introduction: </strong>Tracheotomy is a commonly performed procedure, but with very large disparities according to the teams, both in terms of frequency and modality (percutaneous or surgical), tracheotomy has been evolved with medical advances. The objective of this study was to clarify the indications and complications of emergency tracheotomies at the National hospital center (CHN) in Nouakchott Mauritania. <strong>Materials and Methods: </strong>It is a retrospective study of tracheotomies performed in the ENT department of the CHN during the period from January 1, 2010 to December 31, 2018. The indications and complications were noted, as well as the modalities and time of decannulation. <strong>Results:</strong> Tracheotomy was motivated by upper airway obstruction (UAO) in 139 (94%) cases (mean age 32.5 years), or the need for prolonged ventilation in 8 patients (median age 46 years). Sixteen (7%) early complications were noted with 5 untimely decannulations including one fatal and 5 obstructive plug responsible for another death. Six pneumothorax was observed. Fifteen (26%) late complications required additional surgery;7% (n = 11) of patients were decannulated with a mean duration of tracheotomy 26 months. In 19 (28%) cases of decannulations, the persistence of a tracheocutaneous fistula required surgery. <strong>Conclusion:</strong> Emergency tracheotomy is a survival gesture that is sure to be effective. A tracheotomy is not deprived of complications. Familiarity with the technique, the right choice of equipment, perfect knowledge of the anatomical relationships of the trachea, rigorous monitoring and postoperative care represent the main conditions for minimizing the risk of complications.
文摘Lipomas are the most common fatty mesenchymal tumors in the human body. They are very rare in the oral cavity. With a predilection, they have a rate of 1% to 4%. We report the case of a 74-year-old woman with a large painless lump on the left cheek of the mouth. This mass invading the deep spaces of the face induced a more difficult surgical excision.
