检索结果-南通市图书馆

Water quality in forest and village ponds in Burkina Faso(western Africa)

Journal of Forestry Research 2017年第5期28卷 1039-1048页

作者： Bilass Zongo Frdric Zongo Aboubacar Toguyeni Joseph I.Boussim Laboratoire de Biologie et Ecologie Vgtales Universit de Ouagadougou unit de recherche aquaculture et biodiversit aquatique Laboratoire d'etude et de recherche sur les Ressources Naturelles et les Sciences Environnementales Universit Polytechnique de Bobo-Dioulasso

Forest ecosystems help conserve the quality of water resources in aquatic habitats. The conservation of biological diversity in aquatic and terrestrial ecosystems remains a communal concern. Aquatic ecosystems and resources are vulnerable but can be preserved and protected by forests. In sub-Saharan regions of Africa, water from ecosystems such as ponds still play important role in the livelihood of local populations. Water from temporary ponds is used by local populations for multiple needs; however, in this part of the world, the population is increasing, thus increasing human needs and activities and land use in the region. Land-use changes lead to deforestation, land degradation and the decline in freshwater, affecting human health and well-being. Forest degradation leads to the decline in ecosystem goods and services, particularly those related to watersheds. This study conducted in eastern Burkina Faso aimed to assess water quality of temporary ponds in protected forest areas (reserves) and surrounding villages. It was conducted in 61 temporary ponds where physical, chemical and biological variables were measured, such as water surface area, depth, transparency, macrophyte cover, pH, dissolved O2, conductivity, nutrient concentrations and algae biomass. The results showed that at p depth (p = 0.00), nutrient content (p = 0.00), and algae biomass (p = 0.04) were significantly higher outside reserves than inside reserves. In contrast, macrophyte cover (mean cover percentages 53 vs. 44.5%) and water transparency (p = 0.02) were higher inside reserves. The variations in conductivity and pH were not significant. All trends showed the influences of human activities on water characteristics and the role forests and land cover had in preventing negative human impacts and disturbance of temporary ponds. Forests and land cover are important to water quality conservation and algae biomass regulation in temporary ponds. Prot

关键词： Ecosystem services Pond water Reserves Variables Western Africa

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Additive neurorestorative effects of exercise and docosahexaenoic acid intake in a mouse model of Parkinson’s disease

引用

Neural Regeneration Research 2025年第2期20卷 574-586页

作者： Olivier Kerdiles Méryl-Farelle Oye Mintsa Mi-mba Katherine Coulombe Cyntia Tremblay VincentÉmond Martine Saint-Pierre Clémence Rouxel Line Berthiaume Pierre Julien Francesca Cicchetti Frédéric Calon Facultéde pharmacie UniversitéLaval1050 Avenue de la MédecineQuebecQCCanada Axe Neuroscience Centre de recherche du CHU de Québec-UniversitéLaval(Pavillon CHUL)2705 Boulevard LaurierQuebecQCCanada Institute of Nutrition and Functional Foods QuebecQCCanada Optinutribrain International Associated Laboratory(NutriNeuro FranceINAFCanada)QuebecQCCanada Axe Endocrinologie et Néphrologie Centre de recherche du CHU de Québec-UniversitéLavalQuebecQCCanada Département de Médecine Facultéde MédecineUniversitéLavalQuebecQCCanada Département de Psychiatrie et Neurosciences Facultéde MédecineQuebecQCCanada

There is a need to develop interventions to slow or reverse the degeneration of dopamine neurons in Parkinson’s disease after *** that preclinical and clinical studies suggest benefits of dietary n-3 polyunsaturated fatty acids,such as docosahexaenoic acid,and exercise in Parkinson’s disease,we investigated whether both could synergistically interact to induce recovery of the dopaminergic ***,mice received a unilateral stereotactic injection of 6-hydroxydopamine into the striatum to establish an animal model of nigrostriatal *** weeks after lesion,animals were fed a docosahexaenoic acid-enriched or a control diet for the next 8 *** this period,the animals had access to a running wheel,which they could use or *** acid treatment,voluntary exercise,or the combination of both had no effect on(i)distance traveled in the open field test,(ii)the percentage of contraversive rotations in the apomorphine-induction test or(iii)the number of tyrosine-hydroxylase-positive cells in the substantia nigra pars ***,the docosahexaenoic acid diet increased the number of tyrosine-hydroxylase-positive terminals and induced a rise in dopamine concentrations in the lesioned *** to docosahexaenoic acid treatment or exercise alone,the combination of docosahexaenoic acid and exercise(i)improved forelimb balance in the stepping test,(ii)decreased the striatal DOPAC/dopamine ratio and(iii)led to increased dopamine transporter levels in the lesioned *** present results suggest that the combination of exercise and docosahexaenoic acid may act synergistically in the striatum of mice with a unilateral lesion of the dopaminergic system and provide support for clinical trials combining nutrition and physical exercise in the treatment of Parkinson’s disease.

关键词： 6-hydroxydopamine dopamine dopamine transporter exercise neurorestoration Parkinson’s disease polyunsaturated fatty acids omega-3

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Interest of D-dimer level,severity of COVID-19 and cost of management in Gabon

引用

World Journal of Critical Care Medicine 2025年第1期14卷 91-99页

作者： Berthe A Iroungou Arnaud Nze O Helga M Kandet Y Neil-Michel Longo-Pendy Nina D Mezogho-Obame Annicet-Clotaire Dikoumba Guignali L Mangouka unitéMixte de recherche Centre International de Recherches Médicales de Franceville et le Service de SantéMilitaireLibreville 20404EstuaireGabon AP-HP Health Economics Research UnitHtel Dieu HospitalParis 75004Ilede-FranceFrance Laboratory Hôpital D'Instruction des Armées D'AkandaLibreville 20404EstuaireGabo unitéde recherche enÉcologie de la Santé Centre Interdisciplinaire de Recherches Médicales de FrancevilleFranceville 769Gabon Laboratory Hôpital D'Instruction des Armées Omar Bongo OndimbaLibreville 20404EstuaireGabon department of Medecine Polyvalente Hôpital D'Instruction des Armées Omar Bongo OndimbaLibreville 20404EstuaireGabon

BACKGROUND Coronavirus disease 2019(COVID-19)is strongly associated with an increased risk of thrombotic events,including severe outcomes such as pulmonary *** D-dimer levels are a critical biomarker for assessing this *** Gabon,early implementation of anticoagulation therapy and D-dimer testing has been crucial in managing *** study hypothesizes that elevated Ddimer levels are linked to increased COVID-19 *** To determine the impact of D-dimer levels on COVID-19 severity and their role in guiding clinical *** This retrospective study analyzed COVID-19 patients admitted to two hospitals in Gabon between March 2020 and december *** study included patients with confirmed COVID-19 diagnoses and available D-dimer measurements at *** on demographics,clinical outcomes,D-dimer levels,and healthcare costs were ***-19 severity was classified as non-severe(outpatients)or severe(inpatients).A multivariable logistic regression model was used to assess the relationship between D-dimer levels and disease severity,with adjusted odds ratios(OR)and 95%*** A total of 3004 patients were included,with a mean age of 50.17 years,and the majority were female(53.43%).Elevated D-dimer levels were found in 65.81%of patients,and 57.21%of these experienced severe *** analysis showed that patients with elevated D-dimer levels had 3.33 times higher odds of severe COVID-19(OR=3.33,95%CI:2.84-3.92,Pden,particularly for uninsured *** D-dimer predicts COVID-19 severity and guides treatment,but the high cost of anticoagulant therapy highlights the need for policies ensuring affordable access in resource-limited settings like Gabon.

关键词： D-dimers COVID-19 Management Disease severity Healthcare costs Gabon

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Central role of altered phosphodiesterase 2-dependent signaling in the pathophysiology of cognition-based brain disorders

引用

Neural Regeneration Research 2025年第8期20卷 2302-2303页

作者： Asma Boulksibat Alessandra Tempio Barbara Bardoni Institut de Pharmacologie Moléculaire et Cellulaire CNRS UMR7275Inserm U1323ValbonneFrance

The second messengers 3',5'-cyclic adenosine monophosphate(cAMP)and 3',5'-cyclic guanosine monophosphate(cGMP)modulate molecular pathways that are involved in a large variety of cellular *** the brain,these processes include neurogenesis,neuronal differentiation,activation and function of microglia,and synaptic plasticity,finally resulting in memory formation.

关键词： formation processes finally

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Measurement of electrical charges carried by airborne bacteria laboratory-generated using a single-pass bubbling aerosolizer

引用

Particuology 2015年第1期13卷 179-185页

作者： Xavier Simon Sébastien Bau denis Bémer Philippe Duquenne Institut National de recherche et de Securite(INRS)

Widely used bioaerosol generators like Collison nebulizer probably produce electrostatically charged par- ticles, but the electrical charges carried by laboratory-generated airborne microorganisms using bubbling aerosolizers are poorly understood. In this study, we measured the fraction of neutral particles and num- ber of elementary charges per particle as a function of the aerodynamic diameter of airborne bacteria （Escherichia coli and Enterococcus hirae）. Bioaerosols were produced by a liquid sparging aerosolizer-type bubbling generator, with particle sizes ranging from roughly 0.6 to 2 p^m. The experimental setup included an electrostatic precipitator and real-time devices including an electrometer, aerodynamic particle sizer, and electrical low-pressure impactor. Experimental results obtained for various operating conditions showed that aerosols produced with a higher bubbling airflow contained a larger proportion of neutral particles （from around 30% to 50%） and that bacteria carried a greater average absolute number of elementary charges （from around -10 to -60 elementary units） than those under lower airflow. Under the investigated conditions, a neutralization step is unnecessary because it may have a negative effect on the viability of sensitive microorganisms. Our results suggest that the neutral fraction can be used down- stream of an electrostatic precipitator, and that this setup may have advantages over bipolar neutralizers.

关键词： Bubbling generator Bioaerosol Electrical charge Electrostatic precipitator Escherichia coil Enterococcus hirae

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Data-driven drug repositioning using olfactory omics profiles:challenges and perspectives in neurodegeneration

引用

Neural Regeneration Research 2025年第7期20卷 1997-1998页

作者： Paz Cartas-Cejudo Adriana Cortés Mercedes Lachén-Montes Elena Anaya-Cubero Joaquín Fernández-Irigoyen Enrique Santamaría Clinical Neuroproteomics unit Proteomics PlatformNavarrabiomedHospitalario Universitario de Navarra(HUN)Universidad Pública de Navarra(UPNA)IdiSNANavarra Institute for Health ResearchPamplonaSpain

Data-driven drug repositioning using olfactory omics profiles-challenges and perspectives in neurodegeneration:Neurodegenerative diseases are characterized by progressive degeneration and loss of neuronal function in the central nervous *** diseases are often characterized as proteinopathies,which are disorders primarily driven by the aggregation or misfolding of specific amyloid proteins within cells,leading to their dysfunction and eventual *** the gain-of-function hypothesis related to the aggregation of these proteins,recently,an alternative hypothesis regarding the loss-of-function of the soluble monomeric proteins during the process of aggregation into amyloids is gaining *** last event is called proteinopenia and refers to conditions characterized by a deficiency or decrease in the levels of specific soluble proteins in the body(Ezzat et al.,2023).It has been demonstrated that levels of soluble proteins involved in neurodegenerative diseases are decreased.

关键词： diseases drug amyloid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Wave packet dynamics of nonlinear Gazeau–Klauder coherent states of a position-dependent mass system in a Coulomb-like potential

引用

Chinese Physics B 2021年第6期30卷 154-163页

作者： Faustin Blaise Migueu Mercel Vubangsi Martin Tchoffo Lukong Cornelius Fai unitéde recherche de Matière Condensée d'Électronique et de Traitement du SignalDépartement de PhysiqueFacultédes SciencesUniversitéde DschangB.P:67DschangCameroon Computational Material Science Laboratory Higher Technical Teachers'Training College BambiliUniversity of BamendaPO Box 39BamendaCameroon Centre d'Études et de recherches en Agronomie et en biodiversité Universitéde DschangDschangCameroon

AD = 1 position-dependent mass approach to constructing nonlinear quantum states for a modified Coulomb potential is used to generate Gazeau–Klauder coherent states. It appears that their energy eigenvalues are scaled down by the quantum number and the nonlinearity coefficient. We study the basic properties of these states, which are found to be undefined on the whole complex plane, and some details of their revival structure are discussed.

关键词： deformed Coulomb potential energy spectrum coherent states photon number distribution quantum revivals

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Role of the ejaculatory bulb in biosynthesis of the male pheromone cis-vaccenyl acetate in Drosophila melanogaster

引用

Integrative Zoology 2007年第2期2卷 89-99页

作者： Gaëlle GUIRAUDIE-CAPRAZ Dang Ba PHO Jean-Marc JALLON unitéMixte de recherche Universitéde Paris-Sud et Centre National de la recherche Scientifique n°8620 University of Paris SudOrsayFrance

In Drosophila melanogaster,the male ejaculatory bulb is the site of synthesis of a male-specific pheromone,cis-vaccenyl acetate,which functions as both an attractant and an *** long monounsaturated acetate is structurally similar to a number of shorter gland-synthesized moth *** cell monolayer that forms the Drosophila male ejaculatory bulb wall is responsible for the production and secretion of cis-vaccenyl acetate into the seminal *** dissected bulbs were incubated with sodium[14-C]-acetate(or deuterated acetate),a labeled acetate ester was *** labeled acetate ester co-migrated with cis-vaccenyl acetate in thin layer *** of the abdomens of males from which the ejaculatory bulbs had been removed,or the abdomens of females,with radiolabeled acetate did not yield any acetate ester,but did yield other lipid products,including *** the isolated labeled acetate ester was hydrolyzed,no radioactive vaccenol was *** strongly suggests that the acetyl group is incorporated via a transacetylation reaction,but that the vaccenyl moiety is not synthetized in the *** transacetylation enzyme activity was localized in the microsomal subfraction of the bulb homogenate,and its affinity for vaccenol was not very different from that reported for monounsaturated alcohol substrates in moths.

关键词： cis-vaccenyl acetate Drosophila melanogaster ejaculatory bulb male pheromone microsomes transacetylation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dynamics of high-frequency modulated waves in a nonlinear dissipative continuous bi-inductance network

引用

Chinese Physics B 2021年第6期30卷 193-205页

作者： S M Ngounou F B Pelap unitéde recherche de Mécanique et de Modélisation des Systèmes Physiques(UR-2 MSP) Facultédes SciencesUniversitéde DschangBP 69 DschangCameroun unitéde recherche de Matière Condensée d'Electronique et de Traitement du Signal(UR-MACetS) Facultédes SciencesUniversitéde DschangBP 67 DschangCameroun

This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coefficient whose evolution in terms of the carrier wave frequency is checked. There appears that the dissipation coefficient increases with the carrier wave frequency. In the linear limit and for high frequency waves, study of the asymptotic behavior of plane waves reveals the existence of two additional regions in the dispersion curve where the modulational phenomenon is observed compared to the lossless line. Based on the multiple scales method exploited in the continuum approximation using an appropriate decoupling ansatz for the voltage of the two different cells, it appears that the motion of modulated waves is described by a dissipative complex Ginzburg–Landau equation instead of a Korteweg–de Vries equation. We also show that this amplitude wave equation admits envelope and hole solitons in the high frequency mode. From basic sources, we design a programmable electronic generator of complex signals with desired characteristics, which delivers signals exploited as input waves for all our numerical simulations. These simulations are performed in the LTspice software that uses realistic components and give the results that corroborate perfectly our analytical predictions.

关键词： dissipative bi-inductance network high-frequency mode continuous approximation dissipative complex Ginzburg–Landau equation programmable electronic generator LT-Pspice observations

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanical and Abrasive Wear Properties of Anodic Oxide Layers Formed on Aluminium

引用

Journal of Materials Science & Technology 2009年第4期25卷 508-512页

作者： W. Bensalah K. Elleuch M. Feki M. Wery H.F. Ayedi unit'e de recherche de Chimie Industrielle et Mat'eriaux(URCIM) Departement of Materials EngineeringNational School of Engineering IUT Orsay-Paris XI University

Aluminium oxide coatings were formed on aluminium substrates in oxalic acid-sulphuric acid bath. Abrasion tests of the obtained anodic layers were carried out on a pin-on-disc machine in accordance with the ISO/DP 825 specifications. The rickets microhardness, D （HV0.2）, and the abrasion weight loss, Wa （mg） were measured. Influence of oxalic acid concentration （Cox）, bath temperature （T） and anodic current density （J） on D and Wa has been examined, and the sulphuric acid concentration （Csul） was maintained at 100 g.L-1. It was found that high microhardness and abrasive wear resistance of oxide layers were produced under low temperatures and high current densities with the addition of oxalic acid. The morphology and the composition of the anodic oxide layer were examined by scanning electron microscopy （SEM）, atomic force microscopy （AFM）, optical microscopy and glow-discharge optical emission spectroscopy （GDOES）. It was found that the chemistry of the anodizing electrolyte, temperature, and current density are the controlling factors of the mechanical properties of the anodic oxide layer.

关键词： Aluminium oxide Vickers microhardness Abrasive wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：