1
|
Zhang H, Chen X, Wang T, Huang X, Chen X, Shao YT, Meng F, Meisenheimer P, N'Diaye A, Klewe C, Shafer P, Pan H, Jia Y, Crommie MF, Martin LW, Yao J, Qiu Z, Muller DA, Birgeneau RJ, Ramesh R. Room-Temperature, Current-Induced Magnetization Self-Switching in A Van Der Waals Ferromagnet. Adv Mater 2024; 36:e2308555. [PMID: 38016700 DOI: 10.1002/adma.202308555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/30/2023] [Indexed: 11/30/2023]
Abstract
2D layered materials with broken inversion symmetry are being extensively pursued as spin source layers to realize high-efficiency magnetic switching. Such low-symmetry layered systems are, however, scarce. In addition, most layered magnets with perpendicular magnetic anisotropy show a low Curie temperature. Here, the experimental observation of spin-orbit torque magnetization self-switching at room temperature in a layered polar ferromagnetic metal, Fe2.5 Co2.5 GeTe2 is reported. The spin-orbit torque is generated from the broken inversion symmetry along the c-axis of the crystal. These results provide a direct pathway toward applicable 2D spintronic devices.
Collapse
Affiliation(s)
- Hongrui Zhang
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Xiang Chen
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Department of Physics, University of California, Berkeley, CA, 94720, USA
| | - Tianye Wang
- Department of Physics, University of California, Berkeley, CA, 94720, USA
| | - Xiaoxi Huang
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Xianzhe Chen
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Yu-Tsun Shao
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA
- Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089, USA
| | - Fanhao Meng
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Peter Meisenheimer
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Alpha N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Christoph Klewe
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Hao Pan
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Yanli Jia
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
| | - Michael F Crommie
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Department of Physics, University of California, Berkeley, CA, 94720, USA
| | - Lane W Martin
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Departments of Materials Science and NanoEngineering, Chemistry, and Physics and Astronomy, Rice University, Houston, TX, 77005, USA
- Rice Advanced Materials Institute, Rice University, Houston, TX, 77005, USA
| | - Jie Yao
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Ziqiang Qiu
- Department of Physics, University of California, Berkeley, CA, 94720, USA
| | - David A Muller
- School of Applied and Engineering Physics, Cornell University, Ithaca, NY, 14853, USA
- Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, 14853, USA
| | - Robert J Birgeneau
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Department of Physics, University of California, Berkeley, CA, 94720, USA
| | - Ramamoorthy Ramesh
- Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
- Department of Physics, University of California, Berkeley, CA, 94720, USA
- Department of Physics and Astronomy, Department of Materials Science and Nanoengineering, Rice University, Houston, TX, 77005, USA
| |
Collapse
|
2
|
Mosey A, Dale AS, Hao G, N'Diaye A, Dowben PA, Cheng R. Correction to "Quantitative Study of the Energy Changes in Voltage-Controlled Spin Crossover Molecular Thin Films". J Phys Chem Lett 2021; 12:2463. [PMID: 33661649 DOI: 10.1021/acs.jpclett.1c00608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
|
3
|
Mosey A, Dale AS, Hao G, N'Diaye A, Dowben PA, Cheng R. Quantitative Study of the Energy Changes in Voltage-Controlled Spin Crossover Molecular Thin Films. J Phys Chem Lett 2020; 11:8231-8237. [PMID: 32878433 DOI: 10.1021/acs.jpclett.0c02209] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Voltage-controlled nonvolatile isothermal spin state switching of a [Fe{H2B(pz)2}2(bipy)] (pz = tris(pyrazol-1-1y)-borohydride, bipy = 2,2'-bipyridine) film, more than 40 to 50 molecular layers thick, is possible when it is adsorbed onto a molecular ferroelectric substrate. Accompanying this high-spin and low-spin state switching, at room temperature, we observe a remarkable change in conductance, thereby allowing not only nonvolatile voltage control of the spin state ("write") but also current sensing of the molecular spin state ("read"). Monte Carlo Ising model simulations of the high-spin state occupancy, extracted from X-ray absorption spectroscopy, indicate that the energy difference between the low-spin and high-spin state is modified by 110 meV. Transport measurements demonstrate that four terminal voltage-controlled devices can be realized using this system.
Collapse
Affiliation(s)
- Aaron Mosey
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
| | - Ashley S Dale
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
| | - Guanhua Hao
- Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, United States
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Alpha N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, Nebraska 68588, United States
| | - Ruihua Cheng
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
| |
Collapse
|
4
|
Dembowski M, Prange MP, Pouvreau M, Graham TR, Bowden ME, N'Diaye A, Schenter GK, Clark SB, Clark AE, Rosso KM, Pearce CI. Inference of principal species in caustic aluminate solutions through solid-state spectroscopic characterization. Dalton Trans 2020; 49:5869-5880. [PMID: 32307503 DOI: 10.1039/d0dt00229a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Tetrahedrally coordinated aluminate Al(OH)4- and dialuminate Al2O(OH)62- anions are considered to be major species in aluminum-rich alkaline solutions. However, their relative abundance remains difficult to spectroscopically quantify due to local structure similarities and poorly understood effects arising from extent of polymerization and counter-cations. To help unravel these relationships here we report detailed characterization of three solid-phase analogues as structurally and compositionally well-defined reference materials. We successfully synthesized a cesium salt of the aluminate monomer, CsAl(OH)4·2H2O, for comparison to potassium and rubidium salts of the aluminate dimer, K2Al2O(OH)6, and Rb2Al2O(OH)6, respectively. Single crystal and powder X-ray diffraction methods clearly reveal the structure and purity of these materials for which a combination of 27Al MAS-NMR, Al K-edge X-ray absorption and Raman/IR spectroscopies was then used to fingerprint the two major tetrahedrally coordinated Al species. The resulting insights into the effect of Al-O-Al bridge formation between aluminate tetrahedra on spectroscopic features may also be generalized to the many materials that are based on this motif.
Collapse
Affiliation(s)
- Mateusz Dembowski
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Hu Y, Zhong G, Guan YS, Armstrong JN, Li C, Liu C, N'Diaye A, Bhattacharya A, Ren S. Strongly Correlated Aromatic Molecular Conductor. Small 2019; 15:e1900299. [PMID: 30786158 DOI: 10.1002/smll.201900299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 02/11/2019] [Indexed: 06/09/2023]
Abstract
Strongly correlated electronic molecules open the way for strong coupling between charge, spin, and lattice degrees of freedom to enable interdisciplinary fields, such as molecular electronic switches and plasmonics, spintronics, information storage, and superconducting circuits. However, despite exciting computational predictions and promising advantages to prepare flexible geometries, the electron correlation effect in molecules has been elusive. Here, the electron correlation effects of molecular plasmonic films are reported to uncover their coupling of charge, spin, lattice, and orbital for the switchable metal-to-insulator transition under external stimuli, at which the simultaneous transition occurs from the paramagnetic, electrical, and thermal conducting state to the diamagnetic, electrical, and thermal insulating state. In addition, density functional theory calculation and spectroscopic studies are combined to provide the mechanistic understanding of electronic transitions and molecular plasmon resonance observed in molecular conducting films. The self-assembled molecular correlated conductor paves the way for the next generation integrated micro/nanosystems.
Collapse
Affiliation(s)
- Yong Hu
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Guohua Zhong
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
| | - Ying-Shi Guan
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Jason N Armstrong
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Changning Li
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Changjiang Liu
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Alpha N'Diaye
- Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Anand Bhattacharya
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Shenqiang Ren
- Department of Mechanical and Aerospace Engineering, Research and Education in Energy, Environment & Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| |
Collapse
|
6
|
Cao Y, Wang Z, Park SY, Yuan Y, Liu X, Nikitin SM, Akamatsu H, Kareev M, Middey S, Meyers D, Thompson P, Ryan PJ, Shafer P, N'Diaye A, Arenholz E, Gopalan V, Zhu Y, Rabe KM, Chakhalian J. Artificial two-dimensional polar metal at room temperature. Nat Commun 2018; 9:1547. [PMID: 29670098 PMCID: PMC5906683 DOI: 10.1038/s41467-018-03964-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 03/23/2018] [Indexed: 11/09/2022] Open
Abstract
Polar metals, commonly defined by the coexistence of polar crystal structure and metallicity, are thought to be scarce because the long-range electrostatic fields favoring the polar structure are expected to be fully screened by the conduction electrons of a metal. Moreover, reducing from three to two dimensions, it remains an open question whether a polar metal can exist. Here we report on the realization of a room temperature two-dimensional polar metal of the B-site type in tri-color (tri-layer) superlattices BaTiO3/SrTiO3/LaTiO3. A combination of atomic resolution scanning transmission electron microscopy with electron energy-loss spectroscopy, optical second harmonic generation, electrical transport, and first-principles calculations have revealed the microscopic mechanisms of periodic electric polarization, charge distribution, and orbital symmetry. Our results provide a route to creating all-oxide artificial non-centrosymmetric quasi-two-dimensional metals with exotic quantum states including coexisting ferroelectric, ferromagnetic, and superconducting phases.
Collapse
Affiliation(s)
- Yanwei Cao
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA. .,CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Zhejiang, 315201, Ningbo, China.
| | - Zhen Wang
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA, 70803, USA.,Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Se Young Park
- Department of Physics, University of California Berkeley, Berkeley, CA, 94720, USA
| | - Yakun Yuan
- Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA
| | - Xiaoran Liu
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - Sergey M Nikitin
- Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA
| | - Hirofumi Akamatsu
- Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA
| | - M Kareev
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - S Middey
- Department of Physics, University of Arkansas, Fayetteville, AR, 72701, USA.,Department of Physics, Indian Institute of Science, Bangalore, 560012, India
| | - D Meyers
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - P Thompson
- XMas CRG, European Synchrotron Radiation Facility, Cedex 38043, Grenoble, France
| | - P J Ryan
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA.,School of Physical Sciences, Dublin City University, Dublin, 9, Ireland
| | - Padraic Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - A N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - E Arenholz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Venkatraman Gopalan
- Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, PA, 16802, USA
| | - Yimei Zhu
- Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Karin M Rabe
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| | - J Chakhalian
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, USA
| |
Collapse
|
7
|
Fowler DB, N'Diaye A, Laudencia-Chingcuanco D, Pozniak CJ. Quantitative Trait Loci Associated with Phenological Development, Low-Temperature Tolerance, Grain Quality, and Agronomic Characters in Wheat (Triticum aestivum L.). PLoS One 2016; 11:e0152185. [PMID: 27019468 PMCID: PMC4809511 DOI: 10.1371/journal.pone.0152185] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 03/10/2016] [Indexed: 12/14/2022] Open
Abstract
Plants must respond to environmental cues and schedule their development in order to react to periods of abiotic stress and commit fully to growth and reproduction under favorable conditions. This study was initiated to identify SNP markers for characters expressed from the seedling stage to plant maturity in spring and winter wheat (Triticum aestivum L.) genotypes adapted to western Canada. Three doubled haploid populations with the winter cultivar ‘Norstar’ as a common parent were developed and genotyped with a 90K Illumina iSelect SNP assay and a 2,998.9 cM consensus map with 17,541 markers constructed. High heritability’s reflected large differences among the parents and relatively low genotype by environment interactions for all characters considered. Significant QTL were detected for the 15 traits examined. However, different QTL for days to heading in controlled environments and the field provided a strong reminder that growth and development are being orchestrated by environmental cues and caution should be exercised when extrapolating conclusions from different experiments. A QTL on chromosome 6A for minimum final leaf number, which determines the rate of phenological development in the seedling stage, was closely linked to QTL for low-temperature tolerance, grain quality, and agronomic characters expressed up to the time of maturity. This suggests phenological development plays a critical role in programming subsequent outcomes for many traits. Transgressive segregation was observed for the lines in each population and QTL with additive effects were identified suggesting that genes for desirable traits could be stacked using Marker Assisted Selection. QTL were identified for characters that could be transferred between the largely isolated western Canadian spring and winter wheat gene pools demonstrating the opportunities offered by Marker Assisted Selection to act as bridges in the identification and transfer of useful genes among related genetic islands while minimizing the drag created by less desirable genes.
Collapse
Affiliation(s)
- D B Fowler
- Department of Plant Sciences and Crop Development Centre, University of Saskatchewan, Saskatoon, SK, Canada, S7N 5A8
| | - A N'Diaye
- Department of Plant Sciences and Crop Development Centre, University of Saskatchewan, Saskatoon, SK, Canada, S7N 5A8
| | - D Laudencia-Chingcuanco
- Crop Improvement and Genetics Research Unit, USDA-ARS WRRC, 800 Buchanan St. Albany, CA, United States of America, 94710
| | - C J Pozniak
- Department of Plant Sciences and Crop Development Centre, University of Saskatchewan, Saskatoon, SK, Canada, S7N 5A8
| |
Collapse
|
8
|
Lefebvre N, Margery J, N'Diaye A, Farhi D, Ba-Fall K, Niang A, Gning SB, Debonne JM. [Using PubMed subject headings to enhance reference searches]. Med Trop (Mars) 2007; 67:303-8. [PMID: 17784687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The PubMed search engine is an essential tool to stay abreast of the latest medical literature on specific topics. While the basic search techniques are common knowledge, the ability to use medical subject headings properly is an essential in obtaining valuable references. The purpose of this article is to explain what medical subject headings are and how they can be used to improve the results of reference searches in PubMed.
Collapse
Affiliation(s)
- N Lefebvre
- Service des maladies infectieuses et tropicales, Hôpitaux Universitaires de Strasbourg.
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Jannin V, Bérard V, N'Diaye A, Andrès C, Pourcelot Y. Comparative study of the lubricant performance of Compritol 888 ATO either used by blending or by hot melt coating. Int J Pharm 2003; 262:39-45. [PMID: 12927386 DOI: 10.1016/s0378-5173(03)00316-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Compritol 888 ATO is used as a lubricant in oral solid dosage formulations. It can also be used as a hot melt coating agent sprayed onto a powder. In this study, we compare the lubricant performance of Compritol 888 ATO either used by classical blending or by hot melt coating onto Lactopress by compression tests. In physical mix, the Compritol concentration does not affect the compressibility. The same compressibility is obtained with lactose coated by 0.5 or 1% of Compritol, but a higher compressibility can be observed with 2 and 3%. Cohesiveness of lactose depends on the process: hot melt coating induces a decrease of tablet tensile strength. In terms of forces transmission during compression phase and axial ejection pressures, Compritol used by hot melt coating allows for a concentration of 0.5% to directly obtain the lubricant performance of 3% of Compritol used by blending. These results suggest that the hot melt coating process induces an homogeneous repartition of the lubricant on the lactose surface, contrary to classical blending procedure. Thus, lubrication by hot melt coating seems to be a very efficient procedure. It could be used specifically for large surface area particulate systems producing a lot of friction.
Collapse
Affiliation(s)
- V Jannin
- Pharmaceutical Development Laboratory, Gattefossé S.A., BP 603 69804 Saint-Priest Cedex, France
| | | | | | | | | |
Collapse
|
10
|
N'Diaye A, Jannin V, Bérard V, Andrès C, Pourcelot Y. Comparative study of the lubricant performance of Compritol HD5 ATO and Compritol 888 ATO: effect of polyethylene glycol behenate on lubricant capacity. Int J Pharm 2003; 254:263-9. [PMID: 12623202 DOI: 10.1016/s0378-5173(03)00027-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this paper is to study the lubricant capacity of Compritol HD5 ATO, a glyceryl and polyethylene glycol dibehenate, obtained by atomization. This material is compared to Compritol 888 ATO, constituted only by glyceryl dibehenate. First, this study verifies that Compritol HD5 ATO and Compritol 888 ATO present the same granular characteristics and that their mixes with Lactopress present no structural differences. Secondly, in term of compressibility and cohesiveness, the use of Compritol 888 ATO or Compritol HD5 ATO with Lactopress does not involve any significant modification. Finally, the minor difference of lubricant capacity between Compritol HD5 ATO and Compritol 888 ATO has no consequence in compression practice. The presence of polyethylene glycol behenate does not decrease the glyceryl dibehenate compression functionality. This study concludes that Compritol HD5 ATO could be a very interesting excipient because it associates the glyceryl dibehenate lubricant capacity with the polyethylene glycol behenate-specific capacity in terms of dissolution enhancement.
Collapse
Affiliation(s)
- A N'Diaye
- Pharmacy Division LPG, UFR Pharmacy, Université de Bourgogne, F-21079 Dijon, France
| | | | | | | | | |
Collapse
|
11
|
N'Diaye A, Sévoz-Couche C, Nosjean A, Hamon M, Laguzzi R. Stimulation of 5-HT2 receptors in the nucleus tractus solitarius enhances NMDA receptor-mediated reflex-evoked bradycardiac responses in the rat. Auton Neurosci 2001; 92:45-55. [PMID: 11570703 DOI: 10.1016/s1566-0702(01)00318-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The modulation by 5-HT2 receptors in the nucleus tractus solitarius of the reflex bradycardia evoked by stimulation of peripheral baroreceptors and cardiopulmonary chemoreceptors, and their possible functional interactions with local NMDA receptors, were investigated in pentobarbital- and urethane-anaesthetized rats, respectively. Microinjection of the 5-HT2 receptor agonist, 2,5-dimethoxy-4-iodoamphetamine (0.1-0.5 pmol), into the nucleus tractus solitarius elicited a dose-dependent hypotension and bradycardia. Bilateral microinjections at the same site of a subthreshold dose of 2,5-dimethoxy-4-iodoamphetamine (0.05 pmol) significantly enhanced the aforementioned reflex-evoked bradycardiac responses. In contrast, local bilateral microinjections of the NMDA receptor antagonist, 2-amino-5-phosphonopentanoic acid (500 and 1000 pmol), reduced, in a dose-dependent manner, both reflex-evoked responses. The facilitatory effect of 2,5-dimethoxy-4-iodoamphetamine upon these reflex-evoked bradycardiac responses was prevented by prior local microinjection of low doses of either the selective 5-HT2 receptor antagonist, ketanserin (10 pmol), or 2-amino-5-phosphonopentanoic acid (100 pmol), which, on their own, did not affect the reflex-associated bradycardia. These data suggest that 5-HT2 receptors within the nucleus tractus solitarius participate in a facilitatory modulation of the reflex control of heart rate, probably through functional interactions with local NMDA receptors.
Collapse
Affiliation(s)
- A N'Diaye
- Institut National de la Santé et de la Recherche Médicale, Unité 288, Centre Hospitalo-Universitaire Pitié-Salpêtrière, Paris, France
| | | | | | | | | |
Collapse
|
12
|
Bonagamba LG, Sévoz-Couche C, N'Diaye A, Uygun-Louvet K, Callera J, Machado BH, Hamon M, Laguzzi R. Bradycardic responses to microinjection of N-methyl-D-aspartate into the nucleus tractus solitarius are inhibited by local activation of 5-HT(3) receptors. Neuropharmacology 2000; 39:2336-45. [PMID: 10974317 DOI: 10.1016/s0028-3908(00)00093-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Previous reports have described that glutamate ionotropic receptors in the nucleus tractus solitarius (NTS) are involved in the reflex control of heart rate, and that such a control can be inhibited by NTS-5-HT(3) receptor stimulation. In the present study, we examined in urethane anaesthetized rats the effects of intra-NTS microinjection of 1-(m-chlorophenyl)-biguanide (CPBG), a potent and selective 5-HT(3) receptor agonist, on the cardiovascular responses to local administration of glutamate ionotropic receptor agonists. Intra-NTS microinjection of CPBG reduced the atropine-sensitive bradycardia elicited by local microinjection of NMDA without affecting the cardiovascular responses to intra-NTS microinjections of AMPA or kainic acid. The reduction by CPBG of the NMDA-evoked cardiac response was blocked by prior intra-NTS microinjection of granisetron, a 5-HT(3) receptor antagonist, as well as bicuculline, a GABA(A) receptor antagonist. These results suggest that the stimulation of NTS 5-HT(3) receptors specifically reduces, via a GABA-dependent mechanism, the cardiac response to local NMDA administration.
Collapse
Affiliation(s)
- L G Bonagamba
- Department of Physiology, School of Medicine of Ribeirao Preto, Sao Paulo, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Abstract
In prosthetic surgery of the hip joint it is essential to recenter the hip to recreate the leverage of the gluteus medius muscle. Determination of the center of rotation of the hip is difficult if both hip joints have been destroyed. On the basis of 70 frontal radiographs of the hip in the standing position, the authors measured the position of the center of the femoral head in relation to Köhler's line and the TD line joining the two radiological Us ("tear-drops"). On the same radiograph they defined the horizontal and vertical indices. The descriptive analysis of these parameters stresses the influence of sex on the coordinates of the center of rotation of the hip. The authors demonstrated the statistical correlations between the coordinates of this center of rotation of the joint and certain horizontal and vertical indices. It emerged that knowledge of these indices suffices to define the theoretic position of the center of rotation. The method is compared with other principles set out in the literature. The procedure has a clinical application in the context of preoperative planning of prosthetic reconstruction of the acetabulum, whenever it is destroyed bilaterally (after trauma, in congenital dislocation or acetabular loosening, etc).
Collapse
Affiliation(s)
- M H Fessy
- Laboratoire d'Anatomie Médico-Chirurgicale, Faculté de Médecine J. Lisfranc, Saint-Etienne, France
| | | | | | | |
Collapse
|
14
|
Clyti E, Faye O, Huerre M, Cisse L, N'Diaye A, Konare-Diawara H, Keita S. [Case for diagnosis. Ectopic cutaneous schistosomiasis]. Ann Dermatol Venereol 1998; 125:737-8. [PMID: 9867788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- E Clyti
- Service de Dermatologie, Centre Hospitalier de Cayenne
| | | | | | | | | | | | | |
Collapse
|
15
|
N'Diaye A, Herzberg G, Minchella P, Ml S, Neidhardt JH, Morin A. [Resistance of the the coraco-clavicular ligaments to traction: clinical application]. Morphologie 1998; 82:29-32. [PMID: 9949998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
One method for treating chronic incapacitating acromioclavicular dislocation is to resect the external extremity of the clavicle and to stabilise the stump by ligamentoplastic procedures, using the coracoclavicular ligament. The purpose of this work was to evaluate the mechanical quality of the ligamentoplastic approach. Twelve fresh cadavers, average age 80 years, were studied. The samples taken were 24 coracoclavicular ligaments, 24 coraco-acromial ligaments, 9 tendons from the palmaris longus muscle and 9 iliotibial tracts. The ligaments removed were tested in a Instron traction machine at a speed of 10 cm/mn. The mechanical properties of the coracoclavicular and coraco-acromial ligaments were studied. For comparison, those of the tendon of the palmaris longus muscle and the iliotibial tract were also studied. The results show the pre-rupture resistance of the coraco-acromial ligament to be 50% lower than that of the trapezoid and conoid parts of the coracoclavicular ligaments taken together. These results suggest the validity of ligamentoplastic treatment using the coraco-acromial ligament, but that reinforcement, using a tendon from the palmaris longus muscle or a piece of the iliotibial tract, may also be necessary, especially for subjects taking part in sports or with well-developed musculature.
Collapse
Affiliation(s)
- A N'Diaye
- Laboratoire d'Anatomie, Faculté de Médecine, Université Cheikh Anta DIOP, Dakar, Sénégal
| | | | | | | | | | | |
Collapse
|
16
|
N'Diaye A, Mauppin JM, Dia A, Sow ML. [Radiculo-medullary arteries of vertebral origin. Various anatomic aspects from 30 injections-dissections]. Bull Assoc Anat (Nancy) 1993; 77:25-7. [PMID: 8241573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Among medullary arteries we have only examined those directly arising from the vertebral artery at the cervical level. This study is about thirty anatomical samples of cervical spine removed during necropsies; there are treated by injection-dissection method. The observed variations do not allow isolation of any artery for the cervical bulge, as possible most frequently at the lumbar bulge level. We observed variations as sometimes alternate pedicles right or left, as sometimes a symmetrical aspect finishing at the same medullar level. By injecting differently colored liquids, in the right and in the left, a side prevalence has sometimes been noted but real conclusions cannot be draw without isobar and simultaneous injections.
Collapse
Affiliation(s)
- A N'Diaye
- Laboratoire d'Anatomie et d'Organogénèse, Faculté de Médecine et de Pharmacie, Université Cheickh Anta Diop, Dakar, Sénégal
| | | | | | | |
Collapse
|
17
|
Abstract
Blood of different breeds of cattle, namely Lagune from the Atlantic province, Borgou and Borgou x Zebu from the Borgou province, and Somba and Zebu from the Atacora province of Benin, were examined for trypanosome infection. Thick and thin blood smears for trypanosomes, the card agglutination test (CATT), indirect immunofluorescent antibody test (IFAT) and trypanolytic test for antibodies to trypanosomes were used. Trypanosomes were detected in 19.3% (range 9.8-31.4%) of animals by examination of blood smears; antibodies to trypanosomes were found in 89.8% (range 88.4-100%) of samples by IFAT, 50.6% (range 34-87.5%) by CATT and 3.4% (range 1.1-7.1%) by trypanolytic test. Trypanosoma vivax and Trypanosoma congolense were the main species in Benin with a low number of Trypanosoma brucei. Zebu had lower infection rates than trypanotolerant breeds of Benin. The infection rates of various trypanotolerant breeds were not significantly different.
Collapse
Affiliation(s)
- A Doko
- Faculté des Sciences Agronomiques, Université Nationale du Bénin, Cotonou
| | | | | | | | | | | | | |
Collapse
|
18
|
N'Diaye A, Georges P, N'Go A, Festy B. Soil amoebas as biological markers to estimate the quality of swimming pool waters. Appl Environ Microbiol 1985; 49:1072-5. [PMID: 4004231 PMCID: PMC238507 DOI: 10.1128/aem.49.5.1072-1075.1985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The legal biological survey of swimming pool waters is based on both the level of bacteriological contamination and the amount of material of fecal origin. The great number of soil amoebas and the occasional epidemiological risk involved led us to consider using these organisms as possible biological markers to estimate the quality of pool water and the extent of disinfection. During a 1-year survey of 54 public swimming pools, 765 superficial pool and tap water samples were collected. One portion (50 ml) drawn from 1-liter samples was filtered and cultured for amoebas. In specimens considered contaminated we detected at least 20 amoebas per liter, whereas uncontaminated samples contained fewer than 20 amoebas per liter. By keeping the threshold value voluntarily low, we were able to compare tap water with pool water and to monitor the quality of various disinfection procedures (i.e., chlorine, bromine, and Cu-Ag). The data suggest that the filters were not always protective against a high concentration of amoebas. Furthermore, these disinfection procedures were not equally efficient according to estimates based on biological criteria. In addition, the quality of swimming pool water also depends on the quality of its source tap water. Thus, the numeration of soil amoebas can be used as an additional biological marker to estimate the quality of swimming pool water.
Collapse
|
19
|
Chailley B, N'Diaye A, Boisvieux-Ulrich E, Sandoz D. Comparative study of the distribution of fuzzy coat, lectin receptors, and intramembrane particles of the ciliary membrane. Eur J Cell Biol 1981; 25:300-7. [PMID: 7333292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Cilia from seminal vesicles of Discoglossus (Anura, Amphibia) are partially covered with a fuzzy coat easily stained by the PATAg technique. The freeze-fractures of the ciliary membrane show large intramembrane particles (IMPs) not randomly distributed. At the base of the cilium, 3 or 4 rows of large IMPs form the ciliary necklace. Above the necklace, a 0.1 micrometer high region is devoid of particles after which the shaft membrane exhibits large IMPs coarsely lined up in 9 longitudinal rows 0.6 micrometer in height. Smaller IMPs appear randomly dispersed. The fuzzy coat is well developed in regions possessing large IMPs: the necklace region and the basal portion of the shaft. Between the necklace and the shaft, the region lacking in IMPs is also devoid of fuzzy coat. The distribution of Con A receptors is similar to that of large IMPs and to that of filaments in the fuzzy coat. On the contrary, wheat germ agglutinin (WGA) receptors are randomly distributed all along the ciliary membrane. Finally, the relationships between fuzzy coat, lectin receptors, IMPs and fibrillar links between plasma membrane and microtubules of the axoneme are illustrated.
Collapse
|
20
|
Vallot R, N'Diaye A, Bermont A, Jakubowicz C, Yu L. Comportement electrochimique en milieu aqueux de composes organiques moleculaires insolubles ou peu solubles—I. Voltamperometrie de derives quinoniques. Electrochim Acta 1980. [DOI: 10.1016/0013-4686(80)87169-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
21
|
N'Diaye A, Ozon R. [Inhibitory action of prolactin on the ultrastructure of seminal vesicules in Discoglossus picuts Otth (Amphibian anuran)]. Gen Comp Endocrinol 1976; 28:434-45. [PMID: 955374 DOI: 10.1016/0016-6480(76)90152-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
22
|
N'Diaye A, Sandoz D, Boisvieux-Ulrich E, Ozon R. [Action of androgens in the anuran amphibian Discoglossus pictus (Otth). III. Effects of castration and action of androgens on the ultrastructure of the seminal vesicle]. Gen Comp Endocrinol 1974; 24:286-304. [PMID: 4430441 DOI: 10.1016/0016-6480(74)90183-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|