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Search Results: 1 - 10 of 1936 matches for " MS Diallo "
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In vitro regeneration of adult trees of Bambusa vulgaris
A Ndiaye, MS Diallo, D Niang, YK Gassama-Dia
African Journal of Biotechnology , 2006,
Abstract: We developed procedures for the regeneration of Bambusa vulgaris using nodal segments from adult plants. Optimal shoot growth was after 16 days cultivation on modified Murashige and Skoog (MMS) medium supplemented with 2 mg/l of BAP. Elongated shoots of B. vulgaris rooted (45.85%) when cultured in MMS + 20 mg/l IBA. The rooted and acclimated shoots were successfully transferred into the field with 100% of plantlets survival.
Plants regeneration from African cowpea variety (Vigna unguiculata L. Walp.)
MS Diallo, A Ndiaye, M Sagna, YK Gassama-Dia
African Journal of Biotechnology , 2008,
Abstract: Vigna unguiculata (L.) Walp. plant was efficiently regenerated from cotyledonary node explants. The shoots multiplication rate was influenced by the presence or the absence of cotyledons. Explants with two entire cotyledons from 5-6-d-old seedling produced the greater number of shoots (8.30) after two weeks on B5 medium supplemented with 1 mg.l-1 BAP. Shoots elongation is optimal on media supplemented with kinetin. Rooting is improved after an induction phase on half strength MS, producing 95.83% of rooted plants. No confined atmosphere surrounding plantlets is essential for survival during acclimatization. The regenerated plants flowered and produced pods and viable seeds.
Modernization of Public Transports in Senegal: Case of Ticket Payment Method in Dakar Dem Dikk (3Ds) Buses  [PDF]
Sall Ousmane, Diallo Ousmane
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.67013
Abstract: Transport is one of the important keys of growth and socio-economic development for any country. Since 2005, Senegalese authorities have embarked on a vast fleet renewal program to modernize urban transport and professionalize the actors. The purpose of this paper is to sensitize people about the modernization of ticket payment method in Dakar Dem Dikk buses. To achieve this objective, a survey was done through the users and results have shown that the majority of participants agree to adopt the electronic ticketing smart card in public transport. This contactless payment technology is also recommended in commerce sector to facilitate and secure transactions.
Electrical Instability in Pentacene Transistors with Mylar and PMMA/Mylar Gate Dielectrics Transferred by Lamination Process  [PDF]
Abdou Karim Diallo, Abdoul Kadri Diallo, Diouma Kobor, Marcel Pasquinelli
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47125
Abstract: This study deals with electrical instability under bias stress in pentacene-based transistors with gate dielectrics deposited by a lamination process. Mylar film is laminated onto a polyethylene terephthalate (PET) substrate, on which aluminum (Al) gate is deposited, followed by evaporation of organic semiconductor and gold (Au) source/drain contacts in bottom gate top contact configuration (Device 1). In order to compare the influence of the semiconductor/dielectric interface, a second organic transistor (Device 2) which is different from the Device 1 by the deposition of an intermediate layer of polymethyl methacrylate (PMMA) onto the laminated Mylar dielectric and before evaporating pentacene layer is fabricated. The critical device parameters such as threshold voltage (VT), subthreshold slope (S), mobility (μ), onset voltage (Von) and Ion/Ioff ratio have been studied. The results showed that the recorded hysteresis depend on the pentacene morphology. Moreover, after bias stress application, the electrical parameters are highly modified for both devices according to the regimes in which the transistors are operating. In ON state regime, Device 1 showed a pronounced threshold voltage shift associated to charge trapping, while keeping the μ, Ioff current and S minimally affected. Regardless of whether Device 2 exhibited better electrical performances and stability in ON state, we observed a bias stress-induced increase of depletion current and subthreshold slope in subthreshold region, a sign of defect creation. Both devices showed onset voltage shift in opposite direction.
Varicocele and DNA Fragmentation in Senegalese Infertile Males—A Study of 95 Cases  [PDF]
Mama Sy Diallo, Oumar Faye, Yoro Diallo, Rokhaya Ndiaye Diallo, Jean Pascal Demba Diop, Abdoulaye Séga Diallo, Babacar Diao
Advances in Reproductive Sciences (ARSci) , 2017, DOI: 10.4236/arsci.2017.53006
Abstract: Varicocele is the first etiology of infertility in men worldwide and affects almost half of the men dealing with infertility in Senegal. Varicocele is associated with a high rate of sperm DNA fragmentation so this test is being more and more recommended especially when patients have to benefit from an ART (Assisted Reproductive Technology) procedure. The aim of our study was to assess if our patients with varicocele are concerned by higher DNA fragmentation rate in spermatozoon. Sperm samples were collected (95 cases of varicocele and 30 controls) and analyzed between January 2013 and June 2016 in a prospective study. Sperm DNA damage, characterized by the rate of DNA fragmentation was evaluated by TUNEL assay using fluorescence microscopy. There was a significant higher percentage of DNA fragmentation in patients with varicocele (p < 0.001), compared to controls. We plan to study a bigger cohort to assess this tendency and study the benefits of surgery in varicocele by evaluating DNA fragmentation after the procedure.
Semen Abnormality Patterns and Parameters in Male Partners of Infertile Couples in Dakar (Senegal)  [PDF]
Mama Sy Diallo, Abdoulaye Séga Diallo, Pyrrhus Fotso, Yoro Diallo, Babacar Diao, Oumar Faye
Open Journal of Urology (OJU) , 2015, DOI: 10.4236/oju.2015.59024
Abstract: Introduction: Inter individual variation for semen on analysis is well known. Therefore, Semen profile is not the same in individuals from different geographic locations, environments, ways of life, and populations. It is important for a laboratory to have an idea of the semen profile of its population, especially for those who present with infertility. The aim of this study was to draw the pattern of semen abnormalities in male partner of infertile couple in Dakar, Senegal. Materials and Methods: A retrospective study of all the semen samples of male partners of infertile couples submitted for analysis in the laboratory of Cytogenetic and Reproductive Biology of Dakar at the University Teaching hospital from January 2013 to June 2014. Results: A total of 262 male semen analyses were reported. Analysis was performed according to WHO, 2010 manual for examination of human semen. Our study reveals that 80.9% of men in infertile couples present an abnormality in sperm pattern. The main one is oligo-astheno-terato-necrozoospermia (20.2%), followed by azoospermia, (14.1%), astheno-necrospermia (10.3%) and astheno-terato-necro-zoospermia (10.3%). Leucocytospermia was found in 57.8%. Teratozoospermia (80.9%) was the most associated abnormality, followed by necrozoospermia (76.2%). Low sperm count under 5 million per ml concerned 27.7% of the patients, and 11.2% patients had low ejaculate volume. Nearly 42.1% of the male partners are potential candidates for Assisted Reproductive Technology for male infertility. Conclusion: The high rate of semen abnormality in patients of infertile couples and consequently the high rate of potential candidates to Assisted Reproductive Technology for male infertility are important reasons for taking into account rigorously the male subject if we want to improve fertility rate in our context. The pattern of the specific abnormalities found is precious clues to guide management of these patients.
Increased DNA Fragmentation in Patients with Infertility in Dakar (Senegal)  [PDF]
Mama Sy Diallo, Oumar Faye, Abdoulaye Séga Diallo, Yoro Diallo, Babacar Diao
Advances in Reproductive Sciences (ARSci) , 2015, DOI: 10.4236/arsci.2015.34012
Abstract: The presence of DNA fragmentation in semen is associated with poor results in ART (Assisted Re-productive Technology). This has led to the introduction of sperm DNA integrity testing in the clinical assessment of male infertility. The TUNEL assay is one of the most commonly used tests to measure DNA fragmentation in research studies, but it is now being optimized for routine clinical use. So, the objectives of our study were to install the TUNEL assay in our laboratory and to use it to assess the degree of DNA fragmentation in our patients dealing with couple infertility. Forty seven (47) and 25 samples from patients followed up for infertility and known fertile men were analyzed between August 2013 and July 2015 respectively. The sperm samples were evaluated according to the World Health Organization Guidelines. Sperm DNA damage was assessed by the TUNEL assay, with a standardized protocol that we adapted for reading using fluorescence microscopy instead of flow cytometry. The Sperm DNA Fragmentation Index was significantly higher in patients with infertility compared to the controls (22.2% ± 5.6% vs. 16.7% ± 0.7%) with a p < 0.05. This Index was also high in patients with varicocele compared to the control group (22.8% ± 9.2 vs. 16.7% ± 0.7%) (p < 0.01). After establishing the ROC curve (Receiver Operating Characteristics curve), we found a 15% threshold of DNA fragmentation, separating the patients with infertility from the control group. In our study, a 15% threshold positivity of DNA fragmentation using the TUNEL assay was highly associated with infertility. The results indicate that high level DNA fragmentation is associated with infertility.
Forceps Delivery at the Maternity Ward of Donka National Teaching Hospital Conakry (Guinea): Indications and Maternal-Fœtal Prognosis  [PDF]
M. H. Diallo, I. S. Baldé, O. Baldé, B. S. Diallo, A. Diallo, I. Sylla, B. Diallo, A. D. Diallo, Y. Hyjazi, N. Keita
Open Journal of Obstetrics and Gynecology (OJOG) , 2019, DOI: 10.4236/ojog.2019.94049
Abstract: Objectives: The objectives of this work were to describe the socio-demographic, clinical and prognostic characteristics of forceps deliveries at the maternity ward of the Donka National Teaching Hospital of Conakry. Parturients and Method: This was a prospective and descriptive study of all forceps deliveries performed at the Donka National Hospital maternity ward over a 6-month period from April 1, 2018 to September 30, 2018. Results: We performed 90 fetal extractions by forceps on 3518 deliveries i.e. a frequency of 2.55%. The socio-demographic profile of the parturient women was that of a young primiparous woman with an average age of 21.20 years and a full-term pregnancy with an average gestational age of 39 weeks of amenorrhoea. Fore position varieties were the most frequent with, in order of frequency, the fore left occipito-iliac (61.3%) and the fore right occipito-iliac (22.22%).
Data on the migration of health-care workers: sources, uses, and challenges
Bulletin of the World Health Organization , 2004, DOI: 10.1590/S0042-96862004000800010
Abstract: the migration of health workers within and between countries is a growing concern worldwide because of its impact on health systems in developing and developed countries alike. policy decisions need to be made at the national, regional and international levels to manage more effectively this phenomenon, but those decisions will be effective and correctly implemented and evaluated only if they are based on adequate statistical data. most statistics on the migration of health-care workers are neither complete nor fully comparable, and they are often underused, limited (because they often give only a broad description of the phenomena) and not as timely as required. there is also a conflict between the wide range of potential sources of data and the poor statistical evidence on the migration of health personnel. there are two major problems facing researchers who wish to provide evidence on this migration: the problems commonly faced when studying migration in general, such as definitional and comparability problems of "worker migrations" and those related to the specific movements of the health workforce. this paper presents information on the uses of statistics and those who use them, the strengths and limitations of the main data sources, and other challenges that need to be met to obtain good evidence on the migration of health workers. this paper also proposes methods to improve the collection, analysis, sharing, and use of statistics on the migration of health workers.
Quand le savant l’emporte sur le politique
David Diallo
Transatlantica : Revue d'études Américaines , 2009,
Abstract: In this article, I examine some of the reactions that William Julius Wilson’s The Declining Significance of Race has triggered among his colleagues and among black activists. I explain that some criticisms, clearly at odds with scientific research, are the result of ideological interpretations that completely divorce Wilson’s work from its scholarly context. Through my analysis of the controversy caused by Wilson thesis, I importantly address issues of methodology, analytical rigor, and objectivity in scholarly works and emphasize highly biased assumptions presented by myopic researchers who let racial and political ideology take precedence over objectivity.
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