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Qualitative Determination of Photodegradation Products of Progesterone and Testosterone in Aqueous Solution

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American Journal of Analytical Chemistry 2016年第1期7卷 22-33页

作者： Ladji Méité Baba Donafologo Soro Narcisse Kouassi Aboua Véronique Mambo karim Sory traoré Patrick Mazellier Joseh De Laat Laboratoire des Sciences de l’Environnement Unité de Formation et de Recherche des Sciences et Gestion de l’Environnement Université Nangui Abrogoua Abidjan Cote d’Ivoire CNRS-UMR 5805 EPOC Laboratoire de Physico et Toxico Chimie de l’Environnement Université de Bordeaux Bordeaux France Institut de Chimie des Milieux et Matériaux de Poitiers (UMR CNRS 7285) Equipe Eaux Géochimie Santé Ecole Nationale Supérieure d’Ingénieurs de Poitiers Université de Poitiers Poitiers France

Direct photochemical degradations of progesterone (PR) and testosterone (TR), two naturally produced hormones, have been conducted in non-buffered aqueous solution (pH ranging between 5.5 and 6.0). The irradiation experiments were carried out in a batch reactor upon monochromatic (254 nm) and polychromatic (λ > 290 nm) at 25°C. GLC/MS and LC/UV-DAD/MS analyses were performed to investigate phototransformation products after a solid phase extraction (SPE) step for analytes concentration. For each compound several by-products have been identified and are the same ones under both irradiation conditions. Because of the presence of the same chromophore (α, β-unsaturated group) absorbing UV radiations in both hormones, the majority of chromatographic peaks correspond to by-products formed according to identical mechanisms involving isomerization, enolization, oxidation and hydration to lead to the generation of lumiketone, cyclopentenone, spiro-hydration, oxidation and hydroxylation photoproducts.

关键词： Photoproducts Testosterone Progesterone GLC/MS LC/UV-DAD/MS

Epidemiological, Clinical and Echocardiographic Aspects of Non-Obstructive Hypertrophic Cardiomyopathy in the Nephrology and Haemodialysis Department of the POINT G University Hospital

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Open Journal of Nephrology 2023年第2期13卷 81-90页

作者： Hamadoun Yattara Nouhoum Coulibaly Yohana Koné Atabieme Kodio Seydou Sy Aboubacar Sidiki Fofana Abdou Messoum Dolo Djenebou Maiga Magara Samaké Alkaya Touré Abdoul karim traoré Mahamadoun Kougouliba Moustapha Tangara Sahare Fongoro Point G University Hospital Bamako Mali Sikasso Regional Hospital Sikasso Mali Kayes Regional Hospital Kayes Mali Segou Regional Hospital Segou Mali Faculty of Medicine and Odontostomatology University of Science Technique and Technologies of Bamako Bamako Mali

Introduction: LVH is the earliest cardiovascular abnormality in CKD. It is a significant risk factor for mortality and cardiovascular morbidity in patients with chronic kidney disease. The objective of this study was to investigate non-obstructive hypertrophic cardiomyopathy in CKD patients hospitalised in the nephrology and haemodialysis department of the POINT G University Hospital. Methods: This is a prospective study carried out from January 1, 2021 to December 31, 2021 and concerned chronic renal failure patients with non-obstructive hypertrophic cardiomyopathy. Results: During our study, we recorded 89 cases of non-obstructive hypertrophic cardiomyopathy, a prevalence of 42.8%. The sex ratio was 1.2 in favour of men. The average age of the patients was 45 ± 14.4 years with extremes of 16 and 78 years. The risk factors frequently found were anaemia (100%) and hypertension (92.1%). The clinical picture was dominated by the left heart failure syndrome (66.3% of cases). The different types of echocardiographic hypertrophy found were concentric (72%), eccentric (18%) and septal hypertrophy (10%). Conclusion: Non-obstructive hypertrophic cardiomyopathy is the early cardiovascular abnormality encountered in CKD. It is associated with cardiovascular risk factors such as hypertension, anaemia and phosphocalcic disorders.

关键词： LVH Risk Factor Chronic Renal Failure Echocardiography

Steel Surface Defect Detection Using Learnable Memory Vision Transformer

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Computers, Materials & Continua 2025年第1期82卷 499-520页

作者： Syed Tasnimul karim Ayon Farhan Md.Siraj Jia Uddin Department of Computer Science and Engineering BRAC UniversityDhaka1212Bangladesh Department of AI and Big Data Endicott CollegeWoosong UniversityDaejeon34606Republic of Korea

This study investigates the application of Learnable Memory Vision Transformers(LMViT)for detecting metal surface flaws,comparing their performance with traditional CNNs,specifically ResNet18 and ResNet50,as well as other transformer-based models including Token to Token ViT,ViT withoutmemory,and Parallel *** awidely-used steel surface defect dataset,the research applies data augmentation and t-distributed stochastic neighbor embedding(t-SNE)to enhance feature extraction and *** techniques mitigated overfitting,stabilized training,and improved generalization *** LMViT model achieved a test accuracy of 97.22%,significantly outperforming ResNet18(88.89%)and ResNet50(88.90%),aswell as the Token to TokenViT(88.46%),ViT without memory(87.18),and Parallel ViT(91.03%).Furthermore,LMViT exhibited superior training and validation performance,attaining a validation accuracy of 98.2%compared to 91.0%for ResNet 18,96.0%for ResNet50,and 89.12%,87.51%,and 91.21%for Token to Token ViT,ViT without memory,and Parallel ViT,*** findings highlight the LMViT’s ability to capture long-range dependencies in images,an areawhere CNNs struggle due to their reliance on local receptive fields and hierarchical feature *** additional transformer-based models also demonstrate improved performance in capturing complex features over CNNs,with LMViT excelling particularly at detecting subtle and complex defects,which is critical for maintaining product quality and operational efficiency in industrial *** instance,the LMViT model successfully identified fine scratches and minor surface irregularities that CNNs often *** study not only demonstrates LMViT’s potential for real-world defect detection but also underscores the promise of other transformer-based architectures like Token to Token ViT,ViT without memory,and Parallel ViT in industrial scenarios where complex spatial relationships are *** research m

关键词： Learnable Memory Vision Transformer(LMViT) Convolutional Neural Networks(CNN) metal surface defect detection deep learning,computer vision image classification learnable memory gradient clipping label smoothing t-SNE visualization

Single-Centre Descriptive Epidemiological Study of Emergency Haemodialysis Patients in the Haemodialysis Unit of the CHU Point G (Mali)

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Open Journal of Nephrology 2023年第3期13卷 246-255页

作者： Hamadoun Yattara Nouhoum Coulibaly Abdoul karim traoré Seydou Sy Atabieme Kodio Karamoko Djiguiba Mahamadoun Kougoulba Moctar Coulibaly Sah Dit Baba Coulibaly Modi Sidibé Abdou Messoum Dolo Yohana Koné Moustapha Tangara Alkaya Touré Aboubacar Sididki Fofana Magara Samaké Sahare Fongoro Point G University Hospital Bamako Mali Regional Hospital of Segou Segou Mali Hopital Mère-Enfant le Luxembourg Bamako Mali Mali Gavardo Hospital Bamako Mali Infirmary Garnison de Kati Kati Mali Sikasso Regional Hospital Sikasso Mali Kayes Regional Hospital Sikasso Mali Faculty of Medicine and Ondotostomatology of Bamako Bamako Mali

Introduction: Haemodialysis is an exchange of solutes and water between the patient’s blood and a dialysis solution with a composition close to that of normal extracellular fluid, through a semi-permeable membrane. It is used in the treatment of acute or chronic renal failure. The aim was to study the clinical and paraclinical aspects and the outcome of patients starting dialysis treatment for renal failure in an emergency setting. Method: This was a prospective study from 1 January to 31 July 2020, with a sample of 62 patients receiving haemodialysis in an emergency setting in the nephrology department of the Point G University Hospital. Results: The study showed that the sex ratio was 1.38 in favour of men and that the mean age of patients was 36.82 years. The group of patients with a low socio-economic standard of living dominated, accounting for 71% of cases. Hypertension and anaemia were the predominant risk factors in 77.4% and 87.3% respectively. Hyperphosphaemia, hypocalcaemia and secondary hyperparathyroidism accounted for 94.7%, 98.2% and 97.7% respectively. Left ventricular hypertrophy was 29.27% on electrocardiogram and 22% on cardiac ultrasound. Isolated cardiomegaly was found in 30.76% of patients. The main indications for dialysis were uraemic syndrome (69.2%), pericardial friction (27.4), anuria for 48 hours (20.1%), hyperkalaemia (17.7%) and acute lung oedema (16.1%). The mean duration of haemodialysis was less than one month in one out of two cases. There was no significant association between age and time on dialysis (p = 0.178). The death rate was 20.97%. Case fatality was higher in patients whose duration of dialysis was less than one month than in the others (p = 0.0006). Conclusion: CKD is a public health problem in Mali. It affects young people, especially males. Low economic income is an obstacle to the management of this disease.

关键词： Haemodialysis Emergency CHU Point G

Self-supervised Learning for Speech Emotion Recognition Task Using Audio-visual Features and Distil Hubert Model on BAVED and RAVDESS Databases

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Journal of Systems Science and Systems Engineering 2024年第5期33卷 576-606页

作者： karim Dabbabi Abdelkarim Mars Research Unite of Analyse and Processing of Electrical and Energetic Systems Faculty of Sciences of TunisTunis El-Manar University2092Tunis-Tunisia Research Laboratory in Algebra Numbers Theory and Intelligent SystemsFaculty of Sciences of Monastir90 Mohamed V street5000-MonastirTunisia

Existing pre-trained models like Distil HuBERT excel at uncovering hidden patterns and facilitating accurate recognition across diverse data types, such as audio and visual information. We harnessed this capability to develop a deep learning model that utilizes Distil HuBERT for jointly learning these combined features in speech emotion recognition (SER). Our experiments highlight its distinct advantages: it significantly outperforms Wav2vec 2.0 in both offline and real-time accuracy on RAVDESS and BAVED datasets. Although slightly trailing HuBERT’s offline accuracy, Distil HuBERT shines with comparable performance at a fraction of the model size, making it an ideal choice for resource-constrained environments like mobile devices. This smaller size does come with a slight trade-off: Distil HuBERT achieved notable accuracy in offline evaluation, with 96.33% on the BAVED database and 87.01% on the RAVDESS database. In real-time evaluation, the accuracy decreased to 79.3% on the BAVED database and 77.87% on the RAVDESS database. This decrease is likely a result of the challenges associated with real-time processing, including latency and noise, but still demonstrates strong performance in practical scenarios. Therefore, Distil HuBERT emerges as a compelling choice for SER, especially when prioritizing accuracy over real-time processing. Its compact size further enhances its potential for resource-limited settings, making it a versatile tool for a wide range of applications.

关键词： Wav2vec 2.0 Distil HuBERT HuBERT SER audio and audio-visual features

On Direct Limits of Finite Products of Fields as Subrings of a Commutative Ring

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Algebra Colloquium 2016年第2期23卷 243-249页

作者： D. karim Department of Mathematics Faculty of Nador University Mohamed First P.O. Box 300 62702 Nador Morocco

Let R be a commutative ring. In this paper, we develop the existence of direct limits of finite products of fields as subrings of R.

关键词： Artinian ring direct limit of finite products of fields infinite product von Neumann regular ring zero-dimensional ring

On Crossed Product Algebras over Henselian Valued Fields

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Algebra Colloquium 2020年第3期27卷 389-404页

作者： Driss Bennis karim Mounirh Faculty of Sciences Research Center CeReMAR Mohammed V University in RabatRabatMorocco

Let D be a tame central division algebra over a Henselian valued field E,D be the residue division algebra of D,E be the residue field of E,and n be a positive *** prove that M_(n)(D)has a strictly maximal subfield which is Galois(resp.,abelian)over E if and only if M_(n)(D)has a strictly maximal subfield K which is Galois(resp.,abelian)and tame over E withГ_(K)■Г_(D),whereГ_(K)andГ_(D)are the value groups of K and D,*** partially generalizes the result proved by Hanke et *** 2016 for the case n=1.

关键词： (graded)Brauer group valued division algebras Henselization graded division algebras gauges

Conservation of challenging endemic plant species at high risk of extinction in arid mountain ecosystems:a case study of Rosa arabica Cré*** Egypt

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Journal of Mountain Science 2021年第10期18卷 2698-2721页

作者： karim OMAR Ibrahim ELGAMAL Nature Conservation Sector Ministry of EnvironmentCairo 11728Egypt United Nation Development Program(UNDP) Cairo 2007Egypt

Rosa arabica Cré*** a perennial shrub belonging to the family *** is endemic to the high mountain area of *** Protected Area(SCPA)in southern Sinai,Egypt,and is listed as one of the most 100 threatened plants in the ***,it has been listed as critically endangered by IUCN Red List due to its small extent of occurrence and tiny population *** reported the continuous decline in habitat quality for this species and the urgent need to carry out on-ground conservation ***,this research aims to conserve Rosa arabica through in situ practices by implementing the following steps,respectively:a)evaluate the current conservation status through IUCN Red List to extract the environmental factors controlling the species’distribution necessary for establishing the recovery program,b)determine the potential species habitat suitability under the current climate conditions using Maxent,and c)based on the previous two steps,the translocation process for *** in the suitable habitat will be done after the simple layering process as one of the most effective traditional vegetative methods for wild cultivation for this *** steps aimed to reduce the impact of threats and the risk of extinction through increasing the population size,the Extent of Occurrence(EOO),and the Area of Occupancy(AOO).We extracted the environmental factors controlling the target species’distribution and habitat suitability range using the IUCN Red List assessment and Species Distribution Model(SDM).The most suitable habitat for *** is predicted in the middle northern parts of SCPA,with the highest suitability in the High *** of driest quarter,precipitation of wettest month,precipitation of coldest quarter,and aspect are the highest mean contributors determining the distribution of *** in *** arabica potential distribution covers 324.4 km^(2)(7.46%)of the total SCPA area(4350 km^(2)).This area is divided into:18.1 km^(2)high

关键词： Mountain ecosystems Recovery Translocations Layering Conservation Species distribution modelling Maxent IUCN Red List

A Survey of Arsenic Level in Tube-Wells in Bam Province (Burkina Faso)

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Journal of Environmental Protection 2014年第14期5卷 1406-1410页

作者： Touridomon Issa Somé Abdoul karim Sakira Alidou Kaboré Aissata traoré Laboratory of Toxicology Environment and Health Doctorate School of Health University of Ouagadougou Ouaga Burkina Faso Plan Burkina Ouagadougou Burkina Faso

Groundwater is a main source of water supply for populations in Burkina Faso where there is a serious problem for drinking water access. However, water quality has not been always followed regularly. Recent studies showed that more than 50% of drillings in Yatenga province (north of Burkina Faso) have an arsenic concentration above the recommended WHO requirement. Preliminaries studies conducted in Bam (Center North of Burkina Faso) showed high arsenic level in certain localities. This work presents for the first time data on a large scale evaluation that had been performed in all the localities of Bam province in other to have a better assessment of contamination scale. A total of 707 drilling water samples have been selected randomly in 9 communes and analysed for the arsenic level using atomic absorption spectrometry with hydride generation. The results showed that 11% of drillings have an arsenic concentration above the recommended WHO requirements with Rouko commune having the highest rate of high arsenic level (22%).

关键词： Arsenic Groundwater Contamination Bam Province