检索结果-南通市图书馆

Unraveling giant Cu（110） surface restructuring induced by a non-planar phthalocyanine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2018年第5期11卷 2605-2611页

作者： Nataliya Kalashnyk Luke A. Rochford Dongzhe Li Alexander Smogunov yannick J. Dappe Tim S. Jones Laurent Guillemot Institut des Sciences Moleculaires d'Orsay CNRS Universite Paris-Sud 11 Orsay 91405 France School of Chemistry The University of Birmingham Birmingham B15 2TT UK Department of Physics University ofKonstanz Konstanz 78457 Germany SPEC CEA CNRS Universite Paris-Saclay CEA Saclay Gif-sur-Yvette Cedex 91191 France

The surface stability of coinage metals is paramount when they are used as electrode materials for functional electronic devices incorporating organic semiconductors. In this work, it is shown that the adsorption of non-planar vanadyl phthalocyanine molecules on Cu（110） drastically restructured the metal surface at room temperature, which was further enhanced upon moderate annealing. Scanning tunneling microscopy imaging demonstrated that the surface was restructured at step edges into sawtooth features that gradually replaced the （110） terraces. The edges of the modified steps were preferentially composed of chiral （1×6） kink sites decorated with vanadyl phthalocyanine molecules adsorbed in a tilted configuration with the oxygen atom pointing downwards. These results can have a strong impact on the optimization of the performance of organic devices integrated with phthalocyanine molecules.

关键词： surface restructuring step-etching chiral kink phthalocyanine

Prevalence of Chronic Kidney Disease and Associated Factors among HIV Patients in the Era of HAART in Ivory Coast: A Cross Sectional, Analytical Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Nephrology 2023年第1期13卷 20-30页

作者： Wognin Manzan Anastasie Gonan yannick Kpan Kehi Jonathan Koffi Reine Abdul Khatibat Tia Weu Mélanie Bourhaima Ouattara Internal Medicine Teaching Hospital of Bouaké Alassane Ouattara University Bouaké Ivory Coast

Background: Chronic kidney disease (CKD) may be common among HIV patients living in sub-saharan Africa due to the confluence of CKD risk factors and genetic predisposition. Preventive strategy through early detection and treatment has been advocated for CKD in Africa where majority of patients present late and cannot afford the cost of renal replacement therapy which is not widely available. The purpose of this study was to identify the prevalence and factors associated with CKD among HIV infected adults receiving HAART in a teaching hospital in Ivory Coast. Methods: This is a cross-sectional study of HIV patients on Highly Active Anti Retroviral Therapy followed at the HIV clinic of the medical out-patient department of the University teaching hospital of Bouaké from January to December 2021. CKD was defined as a serum creatinine-based estimated glomerular filtration rate ≤ 60 ml/min/1.73 m2. The collected data was analyzed by using Epi Info 2002 software. Results: Four hundred and two HIV-infected adults 18 years and over were recruited during the study period. We noticed 123 (30.6%) males. The mean age was 40 years. CKD was observed in 42 (10.44) patients infected-HIV. Eighty eight point three percent of patients had CD4 more than 500 cells. Low eGFR correlated with age more than 60 years old, worker in public sector, unemployed, no formal education and HIV type 2. Conclusion: Our study identified a prevalence of CKD of 10.44% by CKD EPI equations among HIV patients on HAART that attended the teaching hospital of Bouaké in Ivory Coast. Early screening and follow up of renal functions is important to minimize the risk of developing end stage kidney disease.

关键词： HIV CKD Prevalence Africa

Prevalence of Plasmodium falciparum isolates lacking the histidine rich protein 2 gene among symptomatic malaria patients in Kwilu Provinee of the Democratic Republic of Congo

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2021年第3期10卷 106-107页

作者： yannick Bazitama Munyeku Alain Abera Musaka Medard Ernest Chris Smith Paul Mankadi Mansiangi Richard Culleton Direction Des Laboratoires de Sante Ministere de La SanteKinshasaDemocratic Republic of the Congo Graduate School of Tropical Medicine and Global Health(TMGH) Nagasaki UniversityNagasakiJapan 不详

Background:Malaria rapid diagnostic tests have become a primary and critical tool for malaria diagnosis in malariaendemic countries where Plasmodium falciparum Histidine Rich Protein 2-based rapid diagnostic tests(PflHRP2-based RDTs)are widely ***,in the last decade,the accuracy of PflHRP2-based RDTs has been challenged by the emerge nee of *** strains harbouring deletions of the *** histidine rich protein 2(pflnrp2)gene,resulting in false-negative *** the Democratic Republic of Congo(***),little is known about the prevalence of the pfhrp2 gene deletion among *** isolates infecting symptomatic patients,especially in low to moderate transmission areas where pfhrp2 deletion parasites are assumed to emerge and *** we determine the local prevalence and factors associated with pfhrp2 gene deletions among symptomatic malaria patients in the Kwilu Province of the ***.

关键词： Plasmodium falciparum histidine rich protein 2 Gene deletion False negative Rapid diagnostic test Symptomatic patient

Consequences of coinfection with protective symbionts on the host phenotype and symbiont titres in the pea aphid system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2017年第5期24卷 798-808页

作者： Melanie Leclair Sarah Polin Thibaut Jousseaume Jean-Christophe Simon Akiko Sugio Stephanie Morliere Takema Fukatsu Tsutomu Tsuchida yannick Outreman IGEPP Agrocampus Ouest INRA Universite de Rennes 1 Universite Bretagne-Loire Rennes France IGEPP Agrocampus OuestINRA Universit6 de Rennes 1 Le Rheu France Bioproduction Research Institute AIST Tsukuba Japan Graduate School of Science and Engineering University of Toyama Toyama Japan

Symbiotic associations between microbes and insects are widespread, and it is frequent that several symbionts share the same host individual. Hence, interactions can occur between these symbionts, influencing their respective abundance within the host with consequences on its phenotype. Here, we investigate the effects of multiple infections in the pea aphid, Acyrthosiphon pisurn, which is the host of an obligatory and several facultative symbionts. In particular, we study the influence of a coinfection with 2 protective symbionts： Harniltonella defensa, which confers protection against parasitoids, and Rickettsiella viridis, which provides protection against fungal pathogens and predators. The effects of Hamiltonella-Rickettsiella coinfection on the respective abundance of the symbionts, host fitness and efficacy of enemy protection were studied. Asymmetrical interactions between the 2 protective symbionts have been found： when they coinfect the same aphid individuals, the Rickettsiella infection affected Hamiltonella abundance within hosts but not the Hamiltonella-mediated protective phenotype while the Hamiltonella infection negatively influences the Rickettsiella-mediated protective phenotype but not its abundance. Harboring the 2 protective symbionts also reduced the survival and fecundity of host individuals. Overall, this work highlights the effects of multiple infections on symbiont abundances and host traits that are likely to impact the maintenance of the symbiotic associations in natural habitats.

关键词： Acyrthosiphon pisum Hamiltonella defensa host fitness multiple infections protective symbionts symbiont abundance

Photonic properties of novel Yb3＋ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2018年第2期11卷 189-198页

作者： Lauro J. Q. MAIA Jyothis THOMAS yannick LEDEMI Kummara V. KRISHNAIAH Denis SELETSKIY Younes MESSADDEQ Raman KASHYAP Instituto de Fisica Universidade Federal de Goias Av. Esperanga 1533 Campus Samambaia Goiania GO 74690-900 Brazil Department of Electrical Engineering Ecole Polytechnique de Montrral P.O. Box 6079 Station Centre-ville Montreal QC H3C 3A7 Canada Department of Engineering Physics Ecole Polytechnique de Montrral P.O. Box 6079 Station Centre-ville Montreal QC H3C 3A7 Canada Centre d'Optique Photonique et Laser 2375 Rue de la Terrasse Universite Laval Qurbec QC G1V 0A6 Canada

Abstract In recent years, our research group has developed and studied new rare-earth doped materials for the promising technology of solid-state laser cooling, which is based on anti-stokes fluorescence. To the best of our knowledge, our group is the only one in Canada leading the research into the properties of nanoparticles, glasses and glass-ceramics for optical refrigeration appli- cations. In the present work, optical properties of 50GeO2- 30PbF2-18PbO-2YbF3 glass-ceramics for laser cooling are presented and discussed as a function of crystallization temperature. Spectroscopic results show that samples have near infrared photoluminescence emission due to the 2F5/2 - 2F7/2 Yb3＋ transition, centered at -1016 nm with an excitation wavelength of 920 nm or 1011 nm, and the highest photoluminescence emission efficiency occurs for heat-treatment for 5 h at 350℃. The internal photolumi- nescence quantum yield varies between 99% and 80%, depending on the temperature of heat-treatment, being the most efficient under 1011 nm excitation. The 2F5/2 lifetime increases from 1.472 to 1.970 ms for heat treatments at 330℃ to 350℃, respectively, due to energy trapping and the low phonon energy of the nanocrystals. The sample temperature dependence was measured with a fiber Bragg grating sensor, as a function of input pump laser wavelength and processing temperature. These measure- ments show that the heating process approaches near zero for an excitation wavelength between 1020 and 1030 nm, which is an indication that phonons are removed effectivelly from the glass-ceramic materials, and they can be used for optical laser cooling applications. On theother hand, the temperature increase as a function of input laser power into samples remains constant between 920 and 980 nm wavelength excitation, a temperature variation of 36 K/W （temperature of 58℃/W） was attained under excitation at 950 nm, showing a possible use for biomedical applications to be explored.

关键词： optical refrigeration oxyfluoride glass-cera-mics Yb3+ doping quantum yield infrared emission lifetime

Biermer Disease in an Unusual Neurological Presentation without Anemia: A Case Report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2022年第5期12卷 129-135页

作者： Nsenga Djapa Guy Roger Fogang Fogoum yannick Ndjitoyap Ndam Antonin Wilson Kowo Pierre Mathurin Ankouane Andoulo Firmin Choukem Simon Pierre Department of Internal Medicine and Specialties Faculty of Medicine and Pharmaceutical Sciences University of Dschang Dschang Cameroon Gastroenterology Unit Internal Medicine Service Ebolowa Regional Hospital Ebolowa Cameroon Department of Internal Medicine and Specialties Faculty of Medicine and Biomedical Sciences University of Yaoundé I Ya-oundé Cameroon

Background: Biermer disease is a megaloblastic disease caused by vitamin B12 deficiency. It is a rare clinical entity especially in subsahara Africa. Case presentation: We report the case of a 45 years old female patient who consulted for a one month history of generalised muscle cramps, weakness and numbness of all four limbs. Physical examination was relevant for a poor gait, poor coordination of both upper and lower limbs, a positive Romberg sign, normal muscle tone in all four limbs, reduced pallesthesia and deep tendon reflexes, abolished plantar reflexes. Paraclinical investigations revealed macrocytosis without anemia, a low cyanocobalamin (vitamin B12) level with a normal folic acid level, an atrophic corporeofundic mucosa which upon pathological analysis revealed a chronic atrophic gastritis with no Helicobacter pylori infection. Anti-intrinsic factor antibodies were positive while anti parietal cells antibodies were negative. The diagnosis of Biermer disease was considered and the patient did well on vitamin B12 supplementation. Conclusion: Though a rare disease, Biermer disease should be considered in a patient who consults for polyneuropathy even in the absence of anemia.

关键词： Biermer Disease Pernicious Anemia Autoimmune Disease Atrophic Gastritis Vitamin B12 Deficiency Cameroon

Rare Association between Chronic Tophaceous Gout and Rheumatoid Arthritis in a Black African Subject: A Case Report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Rheumatology and Autoimmune Diseases 2023年第4期13卷 71-77页

作者： yannick Laurent Tchenadoyo Bayala Abdoul Aziz Ismael Ayouba Tinni Fulgence Kaboré Wenlassida Joëlle Stéphanie Zabsonré/Tiendrebeogo Dieu-Donné Ouedraogo Department of Rheumatology University Teaching Hospital of Bogodogo Ouagadougou Burkina Faso

Rheumatoid arthritis (RA) and gout are common diseases, but their coexistence is rare. We describe the case of a 76-year-old man with hypertension who had been treated for gout for 20 years on allopurinol and colchicine. He was seen in consultation for deforming polyarthritis of the small and large joints, which had been evolving for about 2 years. The acute episode occurred 10 days earlier with the onset of bilateral and symmetrical polyarthritis affecting the large and small joints. The physical examination revealed a peripheral joint syndrome with ulnar gale force deformities of the hands and several buttonhole deformities of the fingers. In addition, there were nodules, some of which were fistulised, giving rise to a chalky slurry. The biology revealed an inflammatory syndrome in addition to rheumatoid factors and ACPA, which were elevated. Biological analysis of the nodular fluid revealed clusters of sodium urate crystals and ultrasound scans of the joints revealed a double-contour appearance in several joints. The diagnosis of RA was made using the 2010 ACR/EULAR criteria. The patient was treated as an outpatient with corticosteroids before being put on methotrexate. It is important to understand that these two conditions can occur at the same time, so it is important to consider them when treating patients with gout or RA.

关键词： Arthritis Gout Rheumatoid Arthritis Tophus Africa

Etiologies, Clinical Presentation and Outcome of Adult Patients Presenting with Bowel Obstruction on a Virgin Abdomen

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surgical Science 2023年第3期14卷 252-269页

作者： Georges Bwelle Motto Tim Fabrice yannick Mahamat Ekani Boukar El-Alaoui Mounjid Khadija Emmanuella Joseph Cyrille Chopkeng Ngoumfe Arthur Essomba Department of Surgery and Specialties Faculty of Medicine and Biomedical Sciences The University of Yaounde 1 Yaounde Cameroon Departement of Visceral and Digestive Surgery Yaounde Central Hospital Yaounde Cameroon Departement of General Surgery Soa District Hospital Yaounde 2 Yaounde Cameroon

Context: Generally in Africa, BO remains the leading cause of acute abdomen. We therefore sought to study the current etiological factors of intestinal obstruction on a virgin abdomen or unhealed abdomen at the central hospital of Yaoundé in order to better understand the main causes and to better anticipate and improve the diagnosis, management and the evolution of intestinal obstruction on a virgin abdomen. Method: The patients were prospectively included from June 2021 to May 2022, these patients were recruited from the digestive and emergency surgery units of the Yaoundé Central Hospital during the study period and who met the inclusion criteria, with suspicion of partial or total intestinal obstruction or those with an intraoperative confirmed diagnosis were enrolled. Results: We recruited 73 patients including 43 (60.3%) men and 29 (39.7%) women whose mean age was 42.5 years with extremes ranging from 16 to 70 years. Most of them consulted after 72 hours, i.e. 65.2% of cases due to self-medication or even prior consultations in the lower level center at the Central Hospital of Yaoundé. The patients retained for this work presented in majority the symptoms according to the abdominal pains, the stop of the materials and gases;meteorism and vomiting. Abdominal wall hernias with incarcerated intestinal loops were the most common cause of intestinal obstruction in an unscarred abdomen in adults at 38.4% of cases, followed by digestive tumors 23.3% and adhesions 17.8%. Exceptionally, a cluster of roundworms was found as the cause of intestinal obstruction in two of our patients. Complications occurred in 25 patients or 31.5% of cases and were dominated respectively by nausea and hematoma (36%), local infections (24%) and malaria (24%). Death occurred in 5 of our patients, or 6.8% of cases, and was mostly caused by hypovolemic shock (40%) and pulmonary embolism (40%). Conclusion: Intestinal obstructions on the abdomen without scarring remain the prerogative of young

关键词： Acute Abdomen Intestinal Obstructions Etiologies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

热生长陶瓷薄膜在压应力作用下的脱落行为

稀有金属材料与工程 2009年第S2期38卷 1150-1153页

作者：齐育红 Philippe Lours yannick Le Maoult 张宗宝大连海事大学 Research Centre on Tools Materials & ProcessesEcoledes Mines

采用表面压痕技术和CCD监测技术研究了PM2000Fe-Cr-Al高温合金热生长氧化物陶瓷薄膜在压应力作用下的脱落行为。结果表明,表面压痕法产生的压痕周围裂纹区域面积和裂纹宽度可定性表征氧化物陶瓷薄膜附着能力,裂纹区域面积越大或裂纹越... 详细信息

采用表面压痕技术和CCD监测技术研究了PM2000Fe-Cr-Al高温合金热生长氧化物陶瓷薄膜在压应力作用下的脱落行为。结果表明,表面压痕法产生的压痕周围裂纹区域面积和裂纹宽度可定性表征氧化物陶瓷薄膜附着能力,裂纹区域面积越大或裂纹越宽薄膜附着能力越差;采用CCD摄像技术可以测得氧化物陶瓷薄膜初试脱落温度及脱落区域的形貌、位置、面积等数据。为进一步理解氧化物陶瓷薄膜的脱落机制提供了更多的信息。

关键词：热生长陶瓷薄膜脱落表面压痕技术 CCD监测技术