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Physicochemical and Bacteriological Profile of Bilanko and Ngamakala Peat Bog Soils (Republic of Congo)

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Journal of Environmental Protection 2024年第8期15卷 842-862页

作者： Gatsé Elgie Viennechie Mboukou Kimbatsa Irène Marie Cecile Ignoumba Evariste Mesmin Morabandza cyr Jonas Nguimbi Etienne Laboratory of Microbiology Infectiology and Immunology ENS-UMNG Brazzaville Republic of Congo Laboratory of Cellular and Molecular Biology FST-UMNG Brazzaville Republic of Congo Laboratory of Remote Sensing and Forest Ecology ENS-UMNG Brazzaville Republic of Congo

Peatlands are unique and complex natural ecosystems that are part of the most important carbon reservoirs on our planet, home to a diversity of microorganisms responsible for fermentation, humification or peat. The aim is to understand chemical and biological indicators of peatland soils. This work aims to determine the physicochemical and bacteriological profile and lipolytic activity of soil bacteria in Bilanko peatlands. The bacterial profile with the production of lipases is carried out by classical microbiology techniques. The results show that the soils are moderately acidic with temperatures of 27.8˚C ± 0.01˚C for Bilanko and 27.1˚C ± 0.57˚C for Ngamakala. The electroconductivity (EC) varies from (9.52 ± 0.002) μS/cm to (39.01 ± 1.4) μS/cm with low turbidity of (2.04 ± 0.66) mg/L to (31.02 ± 0.84) mg/L and low ion concentrations with, however, a richness in phenolic compounds for Bilanko compared to Ngamakala. FMAT diversity ranged from (1.71 ± 0.88)∙104 UFC/g to (2.92 ± 0.07)∙105 UFC/g for Bilanko and (1.30 ± 0.73)∙104 UFC/g to (2.89 ± 0.06)∙104 UFC/g for Ngamakala. Bacillus loads ranged from (5.20 ± 1.40)∙103 CFU/g to (1.22 ± 0.13)∙104 CFU/g and from (1.11 ± 0.13)∙104 CFU/g to (9.20 ± 2.05)∙103 CFU/g;enterobacteria loads from (1.40 ± 0.76)∙103 CFU/g to (8.80 ± 1.73)∙103 CFU/g and from (1.01 ± 0.02)∙103 CFU/g to (9.20 ± 2.05)∙103 CFU/g;in Pseudomonas from 0 to (2.30 ± 0.53)∙102 CFU/g and from 0 to (8.90 ± 2.35)∙102 CFU/g for Bilanko and Ngamakala respectively. These results reveal a variation in bacterial similarity and distribution in the Bilanko and Ngamakala peat bogs.

关键词： Bacteria Lipase Polyphenol Soil Peat Bog Republic of Congo

Quality of Life in Living Kidney Donors Grenoble Teaching Hospital (France)

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Open Journal of Nephrology 2024年第3期14卷 313-323页

作者： Manzan Edwige Anastasie Wognin Abdoul Yannick Gonan Kéhi Jonathan Kpan Monlet cyr Guei Konan Nguessan Michel Christ Ziahy Reine Marie Tia Weu Melanie Bourhaïma Ouattara Lionel Rostaing Department of Internal Medicine Nephrology Hemodialysis Teaching Hospital of Bouak Bouak Ivory Coast Medical Sciences Training and Research Unit Alassane Ouattara University Bouak Ivory Coast Nephrology Hemodialysis and Kidney Transplantation Department Yopougon Teaching Hospital Abidjan Ivory Coast Medical Sciences Training and Research Unit Flix Houphouet Boigny University Abidjan Ivory Coast Department of Internal Medicine Teaching Hospital of Abidjan Abidjan Ivory Coast Department of Nephrology Hemodialysis Apheresis and Renal Transplantation Grenoble Teaching Hospital Grenoble France

Context: Kidney transplantation is today the standard treatment for patients suffering from chronic end-stage renal failure. Living kidney donation offers many advantages for the recipient, but requires a subject without comorbidities to undergo surgery. The aim of this study was to assess the quality of life and psychosocial experience of living kidney donors after donation. Methods: This was a cross-sectional study with an analytical aim, involving living kidney donors during the period from January 2016 to April 2019 at CHUGA. (University Hospital Center of Grenoble Alpes in France). Results: Our study shows that out of 88 donors, 70 responded to our questionnaires, representing a prevalence of 80.5%. The average age of our donors was 55.6 years with a female predominance. Seven out of eight domains of the SF36 score had a good quality of life after donation and the donation did not alter their psychosocial experience. The majority of our donors expressed their pride and enthusiasm, did not regret having saved a life, and this experience was considered positive. Conclusion: Kidney donation does not have a negative impact on quality of life and psychosocial life. The majority of donors do not regret their donation. The dissemination of such results could make it possible to increase the number of kidney transplants from living donors in France, especially in our African countries where the management of ESRD remains a real public health problem.

关键词： Quality of Life Kidney Donors Psychosocial Life

A unified plasticity methodology for rate-and temperature-sensitive alloys exhibiting a non-linear kinematic hardening behavior

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Acta Mechanica Solida Sinica 2017年第1期30卷 27-37页

作者： Jacques Luk-cyr Daniel Paquet Jacques Lanteigne Henri Champliaud Aurelian Vadean Department of Mechanical Engineering Ecole Polyechnique de Montreal 2900 Blvd Edouard-Montpetit MontrealQC H3T 1J4 Institut de recherche d'Hydro-Quebec 1800 Blvd Lionel-Boulet Varennes QC J3X 1S1 Department of Mechanical Engineering Ecole de technologie superieure 1100 Rue Notre-Dame O Montreal QCH3C 1K3

In this paper, a novel unified plasticity methodology is proposed to allow the coupling of rate-and temperature-sensitivity of engineering alloys as well as the non-linear kinematic hardening behavior often observed during cyclic loading. The proposed methodology is general in the sense that an arbitrary constitutive model may be chosen for the viscoplastic part, as well as the cyclic part. We adapt our model with a physically-motivated viscoplasticity flow rule and a nonlinear kinematic hardening model. In contrast with other unified plasticity models, the simplified theory involves few material parameters that can be readily calibrated from standard mechanical tests. The capabilities of the proposed theory are demonstrated for a hot rolled annealed 304 L stainless steel supplied by Vimetal Peckover. The model is tested with stress–strain curves obtained from standard tensile and cyclic uniaxial tests at various strain amplitudes and strain-rates, and good accuracy of the response is obtained for strains up to 15%, within a temperature range of 293–673 K. We note that the cyclic plasticity model in our adapted theory can be readily enhanced with ratchetting, mean stress relaxation, strain amplitude history, Masing effects or other complex capabilities.

关键词： Unified plasticity Constitutive behavior Viscoplasticity Non-linear kinematic hardening Stainless steels

How can the forest sector mitigate climate change in a changing climate? Case studies of boreal and northern temperate forests in eastern Canada

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Forest Ecosystems 2022年第2期9卷 267-287页

作者： Lucas Moreau Evelyne Thiffault Dominic cyr Yan Boulanger Robert Beauregard Departement des sciences du bois et de la foret Universite LavalQuebecCanada Science and Technology Branch Environment and Climate Change CanadaGatineauCanada Laurentian Forestry Centre Natural Resources CanadaQuebecCanada

Background:Forest based climate mitigation emerged as a key component of the Paris Agreement,and thus re-quires robust science to reduce uncertainties related to such *** aim of this study was to assess and compare the cumulative effects on carbon dynamics of forest management and climate change on boreal and northern temperate forest sector in eastern Canada for the 2020–2100 ***:We used the spatially explicit forest landscape model LANDIS-II and its extension Forest Carbon Suc-cession,in conjunction with the Carbon Budget Model for Harvested Wood Products *** simulated the dynamics of forest composition and carbon flows from forest ecosystems to wood products and their substitution effect on markets under increasing climate forcing,according to a tonne-year *** were con-ducted for a series of forest management scenarios based on realistic practices principally by clearcut in the boreal territory and continuous-cover forestry in the northern temperate *** scenarios included:i)a business-as-usual scenario(BaU),representing the current management strategy,ii)increased harvesting by 6.3%to 13.9%,iii)increased conservation(*** harvesting by 11.1%to 49.8%),iiii)and a scenario representing the natural evolution of the forest landscape(*** any management activity).Results:Our study revealed that increasing harvesting levels had contrasting effects on the mitigation potential in northern temperate(enhance net sequestration)and boreal forest sector(enhance net emissions)in comparison to the BaU from 2040 onwards,regardless of the future *** storage in wood products and the substi-tution effect were not sufficient to offset carbon emissions from ***,climate change had a strong impact on the capacity of both landscapes to act as carbon *** temperate landscapes became a net source of carbon over time due to their greater vulnerability to climate change than boreal landsc

关键词： Climate change Carbon Forest sector Forest management Boreal landscapes Northern temperate landscape Mitigation potential

Some Properties of First Order Differential Operators

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Advances in Pure Mathematics 2019年第11期9卷 934-943页

作者： Servais cyr Gatse Département de Mathématiques Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo

We study some properties of first order differential operators from an algebraic viewpoint. We show this last can be decomposed in sum of an element of a module and a derivation. From a geometric viewpoint, we give some properties on the algebra of smooth functions. The Dirac mass at a point is the best example of first order differential operators at this point. This allows to construct a basis of this set and its dual basis.

关键词： Commutative Algebra Differential Operators Module of Differentials

用脉冲半导体激光观察铷原子基态塞曼能级的相干共振

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光学学报 1992年第11期12卷 992-997页

作者：杨世琪 M.Tetu N.cyr M.Guy 华南师范大学物理系广州510631 加拿大拉瓦尔大学电机系光学和激光光电子中心

用半导体激光脉冲序列泵浦汽泡铷原子,观察其基态能级的△m=1和△m=2的塞曼(Zeeman)相干.利用直接调制激光二极管注入电流的增益开关技术,在波长780nm处产生约200ps的激光脉冲.对△m=1,用偏振光谱学方法检测;而对△m=2,则直接使用前向... 详细信息

用半导体激光脉冲序列泵浦汽泡铷原子,观察其基态能级的△m=1和△m=2的塞曼(Zeeman)相干.利用直接调制激光二极管注入电流的增益开关技术,在波长780nm处产生约200ps的激光脉冲.对△m=1,用偏振光谱学方法检测;而对△m=2,则直接使用前向散射光谱学方法检测.

关键词：脉冲激光塞曼效应激光技术铷

On the Caginalp for a Conserve Phase-Field with a Polynomial Potentiel of Order 2<i>p</i>- 1

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Journal of Applied Mathematics and Physics 2020年第12期8卷 2744-2756页

作者： Narcisse Batangouna cyr Séraphin Ngamouyih Moussata Urbain cyriaque Mavoungou Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville République du Congo

Our aim in this paper is to study on the Caginalp for a conserved phase-field with a polynomial potentiel of order 2p - 1. In this part, one treats the conservative version of the problem of generalized phase field. We consider a regular potential, more precisely a polynomial term of the order 2p - 1 with edge conditions of Dirichlet type. Existence and uniqueness are analyzed. More precisely, we precisely, we prove the existence and uniqueness of solutions.

关键词： A Conserved Phase-Field Polynomial Potentiel of Order 2p - 1 Dirichlet Boundary Conditions Maxwell-Cattaneo Law

Finite Difference Preconditioners for Legendre Based Spectral Element Methods on Elliptic Boundary Value Problems

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Applied Mathematics 2013年第5期4卷 838-847页

作者： Seonhee Kim Amik St-cyr Sang Dong Kim Computation and Modeling Shell Technology Center Houston (STCH) Houston USA Department of Mathematics Kyungpook National University Daegu South Korea

Finite difference type preconditioners for spectral element discretizations based on Legendre-Gauss-Lobatto points are analyzed. The latter is employed for the approximation of uniformly elliptic partial differential problems. In this work, it is shown that the condition number of the resulting preconditioned system is bounded independently of both of the polynomial degrees used in the spectral element method and the element sizes. Several numerical tests verify the h-p independence of the proposed preconditioning.

关键词： Finite Difference Preconditioner Iterative Method Spectral Element Method Elliptic Operator

O Measles-Associated Acute Acalculous Cholecystitis

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Advances in Infectious Diseases 2012年第4期2卷 97-99页

作者： Caroline Clerckx Jean-cyr Yombi Leila Belkhir Bernard Vandercam Divisions of Internal Medicine Cliniques Universitaires Saint-Luc Université Catholique de Louvain Brussels Belgium Divisions of Tropical and Infectious Diseases Cliniques Universitaires Saint-Luc Université Catholique de Louvain Brussels Belgium

Background Measles is a highly contagious viral infection whose complications most commonly involve the respiratory tract and the central nervous system. We report here what we think to be the first case of acute acalculous cholecystitis occurring during the course of measles. Case Presentation A 22-year-old female presented with fever, sore throat, coryza and an erythematous maculopapular eruption. The diagnosis of measles was confirmed by the presence of IgM antibodies to measles virus in the absence of IgG antibodies. After initial favorable evolution, she developed abdominal pain with positive Murphy’s sign and elevated liver enzymes. Ultrasonographic examination of the abdomen showed thickening (6.5 mm) of the gallbladder wall in the absence of stones or biliary tract dilatation. Evolution was spontaneously favorable, so that neither antibiotic therapy nor surgical intervention were necessary. Conclusion In the context of worldwide recent measles outbreak, we think that clinicians should be aware of the possible occurrence of acute acalculous cholecystitis, a pathology usually associated with a high rate of complications.

关键词： Acalculous Cholecystitis Measles