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Advances in Entomology 2024年第3期12卷 183-194页

作者： Zinsou François-Xavier Akonde Ousmane Zakari Moussa Sanoussi Atta idriss Hamidou Leyo Iro Dan Guimbo Agricultural Zoology Laboratory AGRHYMET Regional Center Niamey Niger faculty of Agronomy Abdou Moumouni University Niamey Niger

Leafhoppers (jassids) are well-known pests of vegetable crops in Niger. They are often part of a parasitic complex that causes varying degrees of damage. Over the last two crop years, the Niamey region has seen a heavy outbreak of leaf hoppers on okra and guinea sorrel. These insects alone have caused spectacular damage, resulting in losses ranging from 50% to 100% of unharvested plants. Following this observation, infested fields were surveyed, specimens sampled, and the responsible species identified. Two sites were surveyed in the city of Niamey. At each site, two plots of okra and two of guinea sorrel were visited. Fifty (50) plants were randomly sampled using the double “W” method per plot. The sampled plants were used for active and passive leaf hopper capture, damage description and loss assessment. Captured leaf hoppers were identified based on their morphology observed with a binocular magnifying glass and compared with the data in the identification keys. The symptoms observed in the plots were yellowing, leaf curling and drying, stunting, abortion of flowers and immature fruit and very low production. Identification results revealed the single species Amrasca biguttula (Ishida, 1913), which can be considered a new invasive species in Niger. Further confirmation of this identification by molecular tests, the distribution of the pest in Niger and the development of appropriate control methods would yield good prospects.

关键词： Amrasca biguttula Guinea Sorrel Niger Okra Survey

Tuberculosis in the Carcinal Environment in Chad Due to the Mycobacterium Tuberculosis Circulante Complex

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Journal of Biosciences and Medicines 2024年第2期12卷 214-224页

作者： Ahmat idriss Ahmat Mahamat Tahir Ngaré Hassan Ngandolo Bongo Nare Richard Mahamat Adanao Adoudou Mbah Ntepe Leonel Javeres Hamidou Yacoubou Ali Mahamat Moussa Laboratory for Diagnostic Research and Scientific Expertise University of N’Djamena N’Djamena Chad Veterinary and Zootechnical Research Laboratory of farcha N’Djamena Livestock and Development Research Institute N’Djamena Chad Institute of Medical Research and Medicinal Plant Studies (IMPM) Ministry of Scientific Research and Innovation Yaoundé Cameroon Cameroon Ministry of Public Health Yaoundé Cameroon faculty of Human Health Sciences University of N’Djamena N’Djamena Chad

Tuberculosis (TB) is a serious infectious disease and its control is considered a challenge, particularly among vulnerable populations such as prisoners. The prevalence of TB in prisons is an alarming public health problem in many countries. The aim of this study is to describe the epidemiology of tuberculosis and the strategies for controlling this disease in the Chadian prison population. During the course of our study, the prevalence of tuberculosis in prisons was 9.64%. The age group between 55 years and over (43.33%) was the most represented in this study, and all patients were men with a frequency of 62.66%. The cross-tabulation of Culture_7H9G and Culture_7H9P showed that out of our total positive sample, we found a total of 87 positive strains and 63 negative strains. Our study shows that it is essential to know the prevalence of tuberculosis in all the country’s prisons. Indeed, this can serve as an indication of the need for action in prisons to reduce TB rates, in particular by improving the structure of prison environments, diagnosing new cases quickly and accurately, identifying drug-resistant strains and implementing effective, direct treatment observed in people with tuberculosis.

关键词： Mycobacterium Prison Tuberculosis and Chad

Neural Transfer Learning for Soil Liquefaction Tests New Approach to Evaluate Soil Liquefaction based on a Pre-trained Model

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Neural Transfer Learning for Soil Liquefaction Tests New App...

作者： idriss Jairi 西南石油大学

学位级别：硕士

Robust Estimators for Poisson Regression

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Open Journal of Statistics 2023年第1期13卷 112-118页

作者： idriss Abdelmajid idriss Weihu Cheng College of Applied Science Department of Statistics Beijing University of Technology Beijing China

The present paper proposes a new robust estimator for Poisson regression models. We used the weighted maximum likelihood estimators which are regarded as Mallows-type estimators. We perform a Monte Carlo simulation study to assess the performance of a suggested estimator compared to the maximum likelihood estimator and some robust methods. The result shows that, in general, all robust methods in this paper perform better than the classical maximum likelihood estimators when the model contains outliers. The proposed estimators showed the best performance compared to other robust estimators.

关键词： Poisson Regression Model Maximum Likelihood Estimator Robust Estimation Contaminated Model Weighted Maximum Likelihood Estimator

MiR-140 downregulates fatty acid synthesis by targeting transforming growth factor alpha(TGfa)in bovine mammary epithelial cells

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Journal of Integrative Agriculture 2022年第10期21卷 3004-3016页

作者： CHU Shuang-feng ZHAO Tian-qi Abdelaziz Adam idriss ARBAB YANG Yi CHEN Zhi YANG Zhang-ping College of Animal Science and Technology Yangzhou UniversityYangzhou 225009P.R.China Joint International Research Laboratory of Agriculture&Agri-Product Safety Yangzhou UniversityYangzhou 225009P.R.China Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses College of Veterinary MedicineYangzhou UniversityYangzhou 225009P.R.China

fat is an indispensable nutrient and basic metabolite for sustaining life,and milk is particularly rich in fatty acids,including a variety of saturated and unsaturated fatty ***(miRNA)and mRNA play an important role in the regulation of milk fat metabolism in mammary gland *** has been shown that lipid metabolism has a complex transcriptional regulation,but the mechanism by which milk fat synthesis is regulated through miRNA–mRNA interactions is poorly *** this study,we performed transcriptome sequencing with bovine mammary gland tissue in the late lactation(270 and 315 days after parturition)to identify the key gene that regulating milk fat metabolism.A total of 1207 differentially coexpressed genes were selected,828 upregulated genes and 379 downregulated genes were *** transforming growth factor alpha(TGfa)gene was selected as the target gene,and luciferase reporter assay,Western blotting and q RT-PCR were used for further *** results demonstrated that miR-140 was an upstream regulator of TGfa,and miR-140 could inhibit(Pfatty acid and triglyceride(TAGs)production in bovine mammary epithelial cells(BMECs).In contrast,TGfa promoted(Pfatty acid and TAG *** experiments further indicated the mi R-140/TGfa regulatory *** together,these results suggest that the mi R-140/TGfa pathway can inhibit(Pfat metabolism and improve milk quality by genetic means.

关键词： bovine mammary epithelial cells TGfa transcriptome sequencing miR-140 fatty acid metabolism

Weighted Maximum Likelihood Technique for Logistic Regression

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Open Journal of Statistics 2023年第6期13卷 803-821页

作者： idriss Abdelmajid idriss Weihu Cheng Yemane Hailu Fissuh Department of Statistics Faculty of Science Beijing University of Technology Beijing China Department of Statistics Aksum University Tigray Ethiopia

In this paper, a weighted maximum likelihood technique (WMLT) for the logistic regression model is presented. This method depended on a weight function that is continuously adaptable using Mahalanobis distances for predictor variables. Under the model, the asymptotic consistency of the suggested estimator is demonstrated and properties of finite-sample are also investigated via simulation. In simulation studies and real data sets, it is observed that the newly proposed technique demonstrated the greatest performance among all estimators compared.

关键词： Logistic Regression Clean Model Robust Estimation Contaminated Model Weighted Maximum Likelihood Technique

Metformin alleviates LTA-induced inflammatory response through PPARγ/MAPK/NF-κB signaling pathway in bovine mammary epithelial cells

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BIOCELL 2022年第11期46卷 2443-2454页

作者： ABDELAZIZ ADAM idriss ARBAB CHUNQING YIN XUBIN LU YAN LIANG ISMAIL MOHAMED ABDALLA AMER ADAM IDRIS TIANLE XU YONGJIANG MAO ZHANGPING YANG College of Animal Science and Technology Yangzhou UniversityYangzhou225009China Joint International Research Laboratory of Agriculture and Agri-Product Safety ofMinistry of Education of China Yangzhou UniversityYangzhou225009China Biomedical Research Institute Darfur CollegeNyala63313Sudan Shandong Haiding husbandry Co. Ltd.Jinan250100China

Mastitis is a common inflammatory cow mammary infection;that causes significant economic loss in dairy *** the interesting connection between metformin’s anti-inflammatory function and mastitis model induced by LTA in pbMECs,our objective was to prove that metformin was beneficial in suppressing proinflammatory response induced by LTA through modulation of mitogen-activated protein kinase(MAPK)and nuclear factor kappa B(NF-κB)signaling pathways and activation of peroxisome proliferator-activated receptor-γ(PPARγ)in *** proliferation of cells and mRNA expression were measured using EdU assay and quantitative reverse transcriptase-polymerase chain reaction(qRT-PCR).Immunoblotting and immunofluorescence analysis were conducted to evaluate the expression of target proteins in inflammatory and anti-inflammatory responses to metformin and ***,pbMECs were allowed to treat with the PPAR antagonist GW9662,and inflammatory markers were detected in the *** results showed that LTA concentration at 100μg/mL significantly stimulated the MAPK14,IL-6 and IL-1βmRNA expressions compared to the control cells(P<0.05)in dose-dependent tests for *** suppressed the phosphorylation expressions of MAPK(ERK1/2,p38,and JNK)in LTA-stimulated *** also reduced the protein expression of NF-κB,interleukin-8(IL-8),interleukin-1β(IL-1β)and interleukin-6(IL-6)in pbMECs pretreated with *** administration activated PPARγphosphorylation by up-regulating the expression of PPARγin LTA-stimulated *** with GW9662 resulted in increased IL-6 expression,which was reversed by *** findings collectively indicated that metformin act to attenuate LTA-stimulated inflammatory response in pbMECs by suppressing MAPK and NF-κB activation via a mechanism partially dependent on PPARγ*** results suggested that metformin could function as an anti-inflammatory drug in the treatment of mastitis.

关键词： Metformin LTA Primary bovine mammary epithelial cell Anti-inflammatory effect PPARγ Nuclear factor-κB Mitogen-activated protein kinase

Different Species of Salmonella spp and Shigella spp and Their Risk of Infection in N’Djamena Chad

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Journal of Biosciences and Medicines 2023年第11期11卷 1-12页

作者： Mahamat Tahir N’garé Hassan Ahmat idriss Ahmat Yacoub Mahamat Allamine Abakar Lawane idriss Allagueryane Djimadinan Abderrazzack Adoum Foudda Ali Mahamat Moussa Laboratoire de Recherche Diagnostics et d’Expertises Scientifiques Ministère de la Santé Publique et de la Prevention N’Djamena Tchad Laboratoire de Recherche en Sciences des Aliments et Nutrition Faculté des Sciences de la Santé Humaine (FSSH) Université de N’Djamena N’Djamena Tchad Programme Sectoriel de Lutte Contre le Sida Université Touma&iuml N’Djamena Tchad Services Gastro-Entero-Hépatique Centre Hospitalier Universitaire de la Référence Nationale N’Djaména Tchad Faculté des Sciences de la Santé Humaine N’Djaména Tchad

Introduction: Salmonella and Shigella are gram-negative bacilli that are resistant to most antibiotics and play an important role in an etiology of diarrhea disease. The aim of the study was to determine the prevalence of Salmonella spp and Shigella spp isolated from stool and blood samples in the city of N’Djamena. Materials and Method: This was a prospective study conducted in the four district hospitals of N’Djamena from 14 July 2022 to 31 December 2022. A questionnaire form was drawn up to collect the information sent to the study patients. The samples were analyzed at the CHU de la Mère et de l’Enfant, Labo-Redes laboratory according to their protocols and the standard of the antibiogram committee of the French microbiology society. Results: Of the 803 biological samples analyzed, 39 were positive for Salmonella spp and Shigella spp, including 15 for Salmonella and 24 for Shigella, giving an overall prevalence rate of 4.85%. Borehole water, uncooked food and lack of access to a latrine constitute a risk of being infected by Salmonella spp and Shigella spp species. Of the 8 antibiotics tested, Salmonella spp and Shigella spp strains showed good sensitivity to nalidixic acid (100% for Salmonella and 90 for Shigella) and to ciprofloxacin (90.9% for Salmonella and 75% for Shigella). Resistance to ampicillin was found in 81.81% of Salmonella species and 78.57% of Shigella species, as was resistance to chloramphenicol (81.81% of Salmonella species and 67.85% of Shigella species). Similarly, cleanliness of the service and equipment is an essential factor in preventing Salmonella and Shigella infections.

关键词： Salmonella Shigella Species Prevalence Antibiotics Resistance Chad

Maternal betaine suppresses adrenal expression of cholesterol trafficking genes and decreases plasma corticosterone concentration in offspring pullets

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Journal of Animal Science and Biotechnology 2020年第1期11卷 241-250页

作者： Halima Abobaker Yun Hu Nagmeldin A.Omer Zhen Hou Abdulrahman A.idriss Ruqian Zhao MOE Joint International Research Laboratory of Animal Health&Food Safety Nanjing Agricultural UniversityNanjing 210095People’s Republic of China Key Laboratory of Animal Physiology&Biochemistry Nanjing Agricultural UniversityNanjing 210095People’s Republic of China College of Allied Medical Sciences University of Nyala155 NyalaSudan.

Background:Laying hens supplemented with betaine demonstrate activated adrenal steroidogenesis and deposit higher corticosterone(CORT)in the egg *** we further investigate the effect of maternal betaine on the plasma CORT concentration and adrenal expression of steroidogenic genes in offspring ***:Maternal betaine significantly reduced(Pfamily 11 subfamily A member 1 and cytochrome P450 family 21 subfamily A member 2,were significantly(Pfactors,such as steroidogenic factor-1,sterol regulatory element-binding protein 1 and c AMP response element-binding protein,was significantly(P<0.05)enhanced,together with their downstream target genes,such as 3-hydroxy-3-methyl-glutaryl-coenzyme A reductase,LDL receptor and sterol regulatory element-binding protein cleavage-activating *** promoter regions of most steroidogenic genes were significantly(P<0.05)hypomethylated,although methyl transfer enzymes,such as AHCYL,GNMT1 and BHMT were ***:These results indicate that the reduced plasma CORT in betaine-supplemented offspring pullets is linked to suppressed cholesterol trafficking into the mitochondria,despite the activation of cholesterol and corticosteroid synthetic genes associated with promoter hypomethylation.

关键词： Adrenal gland Chicken Cholesterol Corticosterone Maternal betaine Steroidogenesis

A stochastic threshold of a delayed epidemic model incorporating Levy processes with harmonic mean and vaccination

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International Journal of Biomathematics 2020年第7期13卷 297-323页

作者： Mohamed El fatini idriss Sekkak Aziz Laaribi Roger Pettersson Kai Wang Laboratory of PDE’s Algebra and Spectral Geometry Faculty of SciencesIbn Tofail University BP 133KenitraMorocco Department of Mathematics Sultan Moulay Slimane University Beni MellalMorocco Department of Mathematics Linnaeus University 35195 VaxjoSweden Department of Applied Mathematics Anhui University of Finance and Economics Bengbu 233030 P.R.China

The aim of this paper is to investigate a stochastic threshold for a delayed epidemic model driven by Levy noise with a nonlinear incidence and ***,we derive a stochastic threshold 77s which depends on model parameters and stochastic coefficients for a better understanding of the dynamical spreading of the ***,we prove the well posedness of the ***,we study the extinction and the persistence of the disease according to the values of ***,using different scenarios of Tuberculosis disease in Morocco,we perform some numerical simulations to support the analytical results.

关键词： Dynamics Levy process delayed model stochastic threshold