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Journal articles on the topic "LMO"
1
Gadani, Keval, Davit Dhruv, Zalak Joshi, Hetal Boricha, K. N. Rathod, M. J. Keshvani, N. A. Shah, and P. S. Solanki. "Transport properties and electroresistance of a manganite based heterostructure: role of the manganite–manganite interface." Physical Chemistry Chemical Physics 18, no. 26 (2016): 17740–49. http://dx.doi.org/10.1039/c6cp02053d.
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In this paper, we report the results of the investigations on the transport properties performed across the manganite–manganite interface in the LaMnO3−δ/La0.7Ca0.3MnO3/LaAlO3 (LMO/LCMO/LAO) heterostructure.
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Tuccillo, Mariarosaria, Oriele Palumbo, Michele Pavone, Ana Belen Muñoz-García, Annalisa Paolone, and Sergio Brutti. "Analysis of the Phase Stability of LiMO2 Layered Oxides (M = Co, Mn, Ni)." Crystals 10, no. 6 (June 20, 2020): 526. http://dx.doi.org/10.3390/cryst10060526.
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Transition-metal (TM) layered oxides have been attracting enormous interests in recent decades because of their excellent functional properties as positive electrode materials in lithium-ion batteries. In particular LiCoO2 (LCO), LiNiO2 (LNO) and LiMnO2 (LMO) are the structural prototypes of a large family of complex compounds with similar layered structures incorporating mixtures of transition metals. Here, we present a comparative study on the phase stability of LCO, LMO and LNO by means of first-principles calculations, considering three different lattices for all oxides, i.e., rhombohedral (hR12), monoclinic (mC8) and orthorhombic (oP8). We provide a detailed analysis—at the same level of theory—on geometry, electronic and magnetic structures for all the three systems in their competitive structural arrangements. In particular, we report the thermodynamics of formation for all ground state and metastable phases of the three compounds for the first time. The final Gibbs Energy of Formation values at 298 K from elements are: LCO(hR12) −672 ± 8 kJ mol−1; LCO(mC8) −655 ± 8 kJ mol−1; LCO(oP8) −607 ± 8 kJ mol−1; LNO(hR12) −548 ± 8 kJ mol−1; LNO(mC8) −557 ± 8 kJ mol−1; LNO(oP8) −548 ± 8 kJ mol−1; LMO(hR12) −765 ± 10 kJ mol−1; LMO(mC8) −779 ± 10 kJ mol−1; LMO(oP8) −780 ± 10 kJ mol−1. These values are of fundamental importance for the implementation of reliable multi-phase thermodynamic modelling of complex multi-TM layered oxide systems and for the understanding of thermodynamically driven structural phase degradations in real applications such as lithium-ion batteries.
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Zhang, Zhihua, Xin Wang, and Daren Lyu. "Estimation of Moist Atmospheric Profiles from Refraction and Attenuation Measurements by Using Centimeter and Millimeter Wave Links between LEO Satellites." Remote Sensing 15, no. 2 (January 8, 2023): 391. http://dx.doi.org/10.3390/rs15020391.
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Microwave occultation using centimeter and millimeter wave links between low Earth orbit (LEO) satellites provide a potential way to estimate the moist atmospheric profiles based on refraction and attenuation measurements, which is called the LEO-LEO microwave occultation (LMO) technique. It has not yet been implemented in orbit. In this paper, we analyzed the attenuation properties at different heights of centimeter and millimeter waves based on simulations. The observing capabilities with different frequency combinations at the X, K, and M bands were analyzed. The results show that LMO may improve the retrieval accuracy of bending angles above 35 km. By using several appropriate frequencies at the X+K+M band, water vapor profiles from the near-surface to the lower stratosphere (~24 km) can be obtained. When the M-band frequencies were added, the temperature retrieval accuracy does not change obviously, but the accuracy of water vapor retrieval can significantly improve above 15 km, especially at about 17–24 km, and the RMS errors decrease from over 20% to less 10%. For promoting the LMO mission in the real world, a frequency combination at the X+K band is proposed, which can provide the potential to observe the temperature profiles at about 2.5–50 km and water vapor profiles at about 2.5–15 km accurately under clear and cloudy conditions. This study demonstrates that LMO can greatly extend the capabilities of the radio occultation technique and improve our ability to measure the moist atmospheric profiles globally.
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Chen, Dong, Guangbiao Zhang, Zhenxiang Cheng, Shuai Dong, and Yuanxu Wang. "Robust manipulation of magnetism in LaAO3/BaTiO3 (A = Fe, Mn and Cr) superstructures by ferroelectric polarization." IUCrJ 6, no. 2 (January 15, 2019): 189–96. http://dx.doi.org/10.1107/s205225251801624x.
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Robust control of magnetism is both fundamentally and practically meaningful and highly desirable, although it remains a big challenge. In this work, perovskite oxide superstructures LaFeO3/BaTiO3 (LFO/BTO), LaMnO3/BaTiO3 (LMO/BTO) and LaCrO3/BaTiO3 (LCO/BTO) (001) are designed to facilitate tuning of magnetism by the electric field from ferroelectric polarization, and are systemically investigated via first-principles calculations. The results show that the magnetic ordering, conductivity and exchange interactions can be controlled simultaneously or individually by the reorientation of the ferroelectric polarization of BTO in these designed superstructures. Self-consistent calculations within the generalized gradient approximation plus on-site Coulomb correction did not produce distinct rotations of oxygen octahedra, but there were obvious changes in bond length between oxygen and the cations. These changes cause tilting of the oxygen octahedra and lead to spin, orbital and bond reconstruction at the interface, which is the structural basis responsible for the manipulation. With the G-type antiferromagnetic (G-AFM) ordering unchanged for both ±P cases, a metal–insulator transition can be observed in the LFO/BTO superstructure, which is controlled by the LFO thin film. The LMO/BTO system has A-type antiferromagnetic (A-AFM) ordering with metallic behavior in the +P case, while it shifts to a half-metallic ferromagnetic ordering when the direction of the polarization is switched. LCO/BTO exhibits C-type antiferromagnetic (C-AFM) and G-AFM orders in the +P and −P cases, respectively. The three purpose-designed superstructures with robust intrinsic magnetoelectric coupling are a particularly interesting model system that can provide guidance for the development of this field for future applications.
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Wang, Jiaxi, Xinyi Fan, Zhijie Chen, Chenwei Chen, and Jing Xie. "Fabrication of polyvinyl alcohol-starch controlled release active film incorporated with 2-hydroxypropyl-β-cyclodextrin/lemongrass oil emulsion for large yellow croaker (Pseudosciaena crocea) preservation." International Food Research Journal 30, no. 4 (August 30, 2023): 896–912. http://dx.doi.org/10.47836/ifrj.30.4.08.
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Polyvinyl alcohol-starch (PVA/ST) active films incorporated with lemongrass oil (LMO) or 2-hydroxypropyl-β-cyclodextrin, and LMO (HP-β-CD/LMO) emulsion were developed in the present work. The effects of LMO or HP-β-CD/LMO emulsion on the properties of films, and their application in large yellow croaker preservation were investigated. The average particle size and the encapsulation efficiency of the HP-β-CD/LMO emulsion were 150.07 nm and 81.32%, respectively. The scanning electron microscopy (SEM) results revealed that HP-β-CD improved the compatibility between PVA and starch, and LMO was well embedded in HP-β-CD. The incorporation of LMO or HP-β-CD/LMO enhanced the water vapour barrier property and flexibility of the film while weakening its mechanical strength. The oxygen barrier property of the film was weakened by the incorporation of LMO and strengthened by HP-β-CD/LMO. The film incorporated with HP-β-CD/LMO exhibited a little weaker antioxidant and antibacterial activities than the film containing LMO owing to their release property. The existence of HP-β-CD postponed the release of LMO from the film into food simulant (10% ethanol). The preservation results demonstrated that the film containing LMO or HP-β-CD/LMO efficiently inhibited the growth of microorganisms and lipid oxidation of fish; and delayed the decomposition of protein and freshness reduction of large yellow croaker. Additionally, the film added with HP-β-CD/LMO exhibited the best protection for fish quality. In other words, the film with the proper release property of active agents contributed to the preservation of aquatic products.
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Kobori, Hiromi, Megumi Sogabe, Akinori Hoshino, Toshifumi Taniguchi, and Tetsuo Shimizu. "Magneto-Transport Properties and Hole Self-Doping due to Excess Oxygen Addition in Polycrystalline LaMnO<sub>3</sub>." Materials Science Forum 1053 (February 17, 2022): 55–60. http://dx.doi.org/10.4028/p-90n56r.
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We have presented the study on magneto-transport properties and hole self-doping due to excess oxygen addition in polycrystalline LaMnO3 (LMO). The polycrystalline LMO samples were prepared by use of a solid-state reaction method. Powder mixtures with a molar ratio of 1:1 between La2O3 and Mn2O3 were pre-annealed at 1100oC for 18 hours in the atmospheres of O2, He and vacuum. By this pre-annealing, non-crystalline LMO samples were produced. After that, the non-crystalline LMO samples were grinded and were pressed into pellets at the pressure of 3t/cm3. The pellets were annealed at 1100oC and 1300oC for 18 hours in the same atmospheres as the pre-annealing. Through these processes, crystalline LMO samples were produced. To investigate the crystallographic structure of the LMO samples, X-ray diffraction (XRD) measurements have been performed by use of Cu-K radiation. From the results of XRD measurements, we have found that all LMO samples have perovskite structure and are polycrystalline. In addition, to investigate the surface structure of the LMO samples, scanning electron microscope (SEM) measurements have been carried out. Electrical resistivities (ERs) for the LMO samples have been measured as a function of temperature (4K-300K). The ERs of the LMO samples produced in O2 atmosphere show lower values as compared with other LMO ones produced in He and vacuum atmospheres. Especially, the temperature dependence of the ER for a LMO sample produced at the annealing temperature of 1100oC in O2 atmosphere shows metallic conduction. Thus, we have considered that this LMO sample has the largest hole self-doping concentration in all LMO ones. In addition, the magnetic field dependences of the magneto-resistance (MR) ratios for the LMO samples have been measured at several temperatures. The ferromagnetic behaviors on the MR ratios have been observed for LMO samples produced in O2 and He atmospheres.
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Kobori, Hiromi, Tohru Kitamura, Toshifumi Taniguchi, and Tetsuo Shimizu. "Strong Hole Self-Doping in LaMnO3 Thin Film on a-SiO2 Substrate Produced by Metal Organic Decomposition Method." Materials Science Forum 962 (July 2019): 17–21. http://dx.doi.org/10.4028/www.scientific.net/msf.962.17.
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We have studied the strong hole self-doping into LaMnO3(LMO) thin films produced by metal organic decomposition (MOD) method. With different heat treatment conditions, LMO thin films have been prepared by the MOD method in the 100 % O2gas atmosphere. We consider that the excess of O2-ions in LMO thin films induces the strong hole self-doping into LMO ones. The quantity of excess O2-ions in LMO is sensitive to the heat treatment conditions of the LMO production, especially the temperature, time and atmosphere gas. Although LMO single crystal is an antiferromagnetic insulator, LMO thin films we have produced in the 100 % O2gas atmosphere by use of the MOD method shows the properties of ferromagnetic metal.
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Kobori, Hiromi, Megumi Sogabe, Akinori Hoshino, Atsushi Yamasaki, Toshifumi Taniguchi, and Tetsuo Shimizu. "Evidence of Hole Self-Doping due to Excess Oxygen Addition in Polycrystal LaMnO3." Materials Science Forum 1023 (March 2021): 9–13. http://dx.doi.org/10.4028/www.scientific.net/msf.1023.9.
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We have presented the evidence of hole self-doping due to excess oxygen addition in polycrystal LaMnO3 (LMO). The polycrystal LMO samples were prepared by use of a solid-state reaction method. Powder mixtures with a molar ratio of 1:1 between La2O3 and Mn2O3 were pre-annealed at 1100oC for 18 hours in the atmospheres of oxygen gas, helium gas and vacuum. By this heat treatment, non-crystalline LMO samples were produced. After that, the non-crystalline LMO samples were grinded and were pressed into pellets at the pressure of 3t/cm3. The pellets were annealed at 1100oC and 1300oC for 18 hours in the same atmospheres as the pre-annealing. Through these processes, polycrystal LMO samples were finally produced. To investigate crystallographic structure of the LMO samples, X-ray diffraction (XRD) measurements were performed by use of Cu-K radiation. From the experimental results of XRD measurements, we have found that all LMO samples have perovskite structure and are polycrystals. In addition, to investigate surface structure of the LMO samples, scanning electron microscope (SEM) measurements were carried out. Electrical resistivities (ERs) of the polycrystal LMO samples were measured as a function of temperature (4K-300K). The ERs of polycrystal LMO samples produced in an oxygen gas atmosphere show lower values as compared with other LMO ones in He gas and vacuum atmospheres. Especially, the temperature dependence of the ER for a polycrystal LMO sample produced at the annealing temperature of 1100oC in an oxygen atmosphere shows a metallic behavior. Thus, we have considered that this LMO sample has the largest hole self-doping concentration in all LMO ones.
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Jo, Minsang, Seong-Hyo Park, and Hochun Lee. "Effects of a Sodium Phosphate Electrolyte Additive on Elevated Temperature Performance of Spinel Lithium Manganese Oxide Cathodes." Materials 14, no. 16 (August 19, 2021): 4670. http://dx.doi.org/10.3390/ma14164670.
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LiMn2O4 (LMO) spinel cathode materials suffer from severe degradation at elevated temperatures because of Mn dissolution. In this research, monobasic sodium phosphate (NaH2PO4, P2) is examined as an electrolyte additive to mitigate Mn dissolution; thus, the thermal stability of the LMO cathode material is improved. The P2 additive considerably improves the cyclability and storage performances of LMO/graphite and LMO/LMO symmetric cells at 60 °C. We explain that P2 suppresses the hydrofluoric acid content in the electrolyte and forms a protective cathode electrolyte interphase layer, which mitigates the Mn dissolution behavior of the LMO cathode material. Considering its beneficial role, the P2 additive is a useful additive for spinel LMO cathodes that suffer from severe Mn dissolution.
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Proschek, V., G. Kirchengast, and S. Schweitzer. "Greenhouse gas profiling by infrared-laser and microwave occultation: retrieval algorithm and demonstration results from end-to-end simulations." Atmospheric Measurement Techniques Discussions 4, no. 2 (April 21, 2011): 2273–328. http://dx.doi.org/10.5194/amtd-4-2273-2011.
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Abstract. Measuring greenhouse gas (GHG) profiles with global coverage and high accuracy and vertical resolution in the upper troposphere and lower stratosphere (UTLS) is key for improved monitoring of GHG concentrations in the free atmosphere. In this respect a new satellite mission concept adding an infrared-laser part to the already well studied microwave occultation technique exploits the joint propagation of infrared-laser and microwave signals between Low Earth Orbit (LEO) satellites. This synergetic combination, referred to as LEO-LEO microwave and infrared-laser occultation (LMIO) method, enables to retrieve thermodynamic profiles (pressure, temperature, humidity) and accurate altitude levels from the microwave signals and GHG profiles from the simultaneously measured infrared-laser signals. However, due to the novelty of the LMIO method, a retrieval algorithm for GHG profiling did not yet exist. Here we introduce such an algorithm for retrieving GHGs from LEO-LEO infrared-laser occultation (LIO) data, applied as a second step after retrieving thermodynamic profiles from LEO-LEO microwave occultation (LMO) data as recently introduced in detail by Schweitzer et al. (2011b). We thoroughly describe the LIO retrieval algorithm and unveil the synergy with the LMO-retrieved pressure, temperature, and altitude information. We furthermore demonstrate the effective independence of the GHG retrieval results from background (a priori) information in discussing demonstration results from LMIO end-to-end simulations for a representative set of GHG profiles, including carbon dioxide (CO2), water vapor (H2O), methane (CH4), and ozone (O3). The GHGs except for ozone are well retrieved throughout the UTLS, while ozone is well retrieved from 10 km to 15 km upwards, since the ozone layer resides in the lower stratosphere. The GHG retrieval errors are generally smaller than 1% to 3% r.m.s., at a vertical resolution of about 1 km. The retrieved profiles also appear unbiased, which points to the climate benchmarking capability of the LMIO method. This performance, found here for clear-air atmospheric conditions, is unprecedented for vertical profiling of GHGs in the free atmosphere and encouraging for future LMIO implementation. Subsequent work will examine GHG retrievals in cloudy air, addressing retrieval performance when scanning through intermittent upper tropospheric cloudiness.
Dissertations / Theses on the topic "LMO"
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Lester, Krystal L. "Characterisation of Oncogenic LMO Transcriptional complexes." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13754.
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The LIM only (LMO) family of proteins are transcriptional regulators that are critical for the regulation of many developmental processes. In early red blood cell development one family member, LMO2, regulates blood cell development (erythropoiesis) through involvement in a transcriptional complex that also contains Tal1, E2a proteins, Gata1 and LDB1. Two components of this complex, Tal1 and LMO2, along with their homologues Lyl1, LMO1 and LMO3, are oncogenes in T cell acute lymphoblastic leukaemia (T ALL). Complexes similar to the erythropoietic LMO2 transcriptional complex are thought to drive the onset of T ALL. This thesis investigates the protein protein interactions of potential constituents of both normal and oncogenic complexes. A full set of tethered LMO-LDB1 sub-complexes was designed, generated, purified and characterised using SEC/MALLS, CD spectropolarimetry and 1D 1H-NMR. The proteins were folded, predominantly monomeric and may be more stable than previously generated versions. Attempts to crystallise the previously uncharacterised LMO1-LDB1 and LMO3-LDB1 constructs are described. GST-pulldown and EMSA experiments were used to show that LMO1–3-LDB1 but not LMO4 LDB1 can bind to Tal1 E2a and Lyl1 E2a heterodimers in the absence of DNA and to characterise heterodimer DNA binding of the higher order complex. These data indicate that the bHLH proteins likely undergo dimer exchange, such that in the presence of DNA, Tal1 E2a proteins form substantial amounts of homodimers as well as heterodimers, but heterodimer formation is favoured by interaction with LMO-LDB1 proteins. No evidence of Lyl1 E2a heterodimer formation on DNA was observed by EMSA, but this heterodimer was stabilised through higher order complex formation with LMO2-LDB1. Binding affinities of LMO1–4-LDB1 to Tal1 E2a heterodimers indicate no binding by LMO4 and similar levels of binding for LMO1–3-LDB1. A protein engineering approach was thus used to generate more stable extended Tal1 E2a constructs, which would be useful for further characterisation of these interactions. Finally, it was shown that Gata2 and Gata3 bind with similar, but slightly lower affinity to LMO2. Also, only the C-terminal finger of Gata1 shows appreciable independent binding to DNA containing GATC/G motifs. The implications of this data for the mechanisms of transcriptional complex formation, and how variant complexes can up- and down-regulate different sets of genes throughout normal development and T-cell leukaemia are discussed.
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Dong, Wei-Feng. "Expression and regulation of rhombotin-2 (RBTN/LMO-2) in normal hematopoiesis and leukemogenesis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0017/NQ53807.pdf.
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Kwan, Ann Hau Yu. "Protein Design Based on a PHD Scaffold." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/564.
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The plant homeodomain (PHD) is a protein domain of ~45�100 residues characterised by a Cys4-His-Cys3 zinc-binding motif. When we commenced our study of the PHD in 2000, it was clear that the domain was commonly found in proteins involved in transcription. Sequence alignments indicate that while the cysteines, histidine and a few other key residues are strictly conserved, the rest of the domain varies greatly in terms of both amino acid composition and length. However, no structural information was available on the PHD and little was known about its function. We were therefore interested in determining the structure of a PHD in the hope that this might shed some light on its function and molecular mechanism of action. Our work began with the structure determination of a representative PHD, Mi2b-P2, and this work is presented in Chapter 3. Through comparison of this structure with the two other PHD structures that were determined during the course of our work, it became clear that PHDs adopt a well-defined globular fold with a superimposable core region. In addition, PHDs contain two loop regions (termed L1 and L3) that display increased flexibility and overlay less well between the three PHD structures available. These L1 and L3 regions correspond to variable regions identified earlier in PHD sequence alignments, indicating that L1 and L3 are probably not crucial for the PHD fold, but are instead likely to be responsible for imparting function(s) to the PHD. Indeed, numerous recent functional studies of PHDs from different proteins have since demonstrated their ability in binding a range of other proteins. In order to ascertain whether or not L1 and L3 were in fact dispensable for folding, we made extensive mutations (including both insertions and substitutions) in the loop regions of Mi2b-P2 and showed that the structure was maintained. We then went on to illustrate that a new function could be imparted to Mi2b-P2 by inserting a five-residue CtBP-binding motif into the L1 region and showed this chimera could fold and bind CtBP. Having established that the PHD could adopt a new binding function, we next sought to use combinatorial methods to introduce other novel functions into the PHD scaffold. Phage display was selected for this purpose, because it is a well-established technique and has been used successfully to engineer zinc-binding domains by other researchers. However, in order to establish this technique in our laboratory, we first chose a control system in which two partner proteins were already known to interact in vitro. We chose the protein complex formed between the transcriptional regulators LMO2 and ldb1 as a test case. We have examined this interaction in detail in our laboratory, and determined its three-dimensional structure. Furthermore, inappropriate formation of this complex is implicated in the onset of T-cell acute lymphoblastic leukemia. We therefore sought to use phage display to engineer ldb1 mimics that could potentially compete against wild-type ldb1 for LMO2, and this work is described in Chapter 4. Using a phage library containing ~3 x 10 7 variants of the LMO2-binding region of ldb1, we isolated mutants that were able to interact with LMO2 with higher affinity and specificity than wild-type ldb1. These ldb1 mutants represent a first step towards finding potential therapeutics for treating LMO-associated diseases. Having established phage display in our laboratory, we went on to search for PHD mutants that could bind selected target proteins. This work is described in Chapter 5. We created three PHD libraries with eight randomized residues in each of L1, L3 or in both loops of the PHD. These PHD libraries were then screened against four target proteins. After four rounds of selection, we were able to isolate a PHD mutant (dubbed L13-FH6) that could bind our test protein Fli-ets. This result demonstrates that a novel function can be imparted to the PHD using combinatorial methods and opens the way for further work in applying the PHD scaffold to other protein design work. In summary, the work detailed in Chapters 3 and 5 demonstrates that the PHD possesses many of the properties that are desirable for a protein scaffold for molecular recognition, including small size, stability, and a well-characterised structure. Moreover, the PHD motif possesses two loops (L1 and L3) of substantial size that can be remodeled for target binding. This may lead to an enhancement of binding affinities and specificities over other small scaffolds that have only one variable loop. In light of the fact that PHDs are mainly found in nuclear proteins, it is reasonable to expect that engineered PHDs could be expressed and function in an intracellular environment, unlike many other scaffolds that can only function in an oxidizing environment. Therefore, our results together with other currently available genomic and functional information indicate PHD is an excellent candidate for a scaffold that could be used to modify cellular processes. Appendices 1 and 2 describe completed bodies of work on unrelated projects that I have carried out during the course of my PhD candidature. The first comprises the invention and application of DNA sequences that contain all N-base sequences in the minimum possible length. This work is presented as a reprint of our recently published paper in Nucleic Acids Research. The second Appendix describes our structural analysis of an antifreeze protein from the shorthorn sculpin, a fish that lives in the Arctic and Antarctic oceans. This work is presented as a manuscript that is currently under review at the Journal of the American Chemical Society.
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Kwan, Ann Hau Yu. "Protein Design Based on a PHD Scaffold." University of Sydney. Molecular and Microbial Biosciences, 2004. http://hdl.handle.net/2123/564.
Full textAbstract:
The plant homeodomain (PHD) is a protein domain of ~45�100 residues characterised by a Cys4-His-Cys3 zinc-binding motif. When we commenced our study of the PHD in 2000, it was clear that the domain was commonly found in proteins involved in transcription. Sequence alignments indicate that while the cysteines, histidine and a few other key residues are strictly conserved, the rest of the domain varies greatly in terms of both amino acid composition and length. However, no structural information was available on the PHD and little was known about its function. We were therefore interested in determining the structure of a PHD in the hope that this might shed some light on its function and molecular mechanism of action. Our work began with the structure determination of a representative PHD, Mi2b-P2, and this work is presented in Chapter 3. Through comparison of this structure with the two other PHD structures that were determined during the course of our work, it became clear that PHDs adopt a well-defined globular fold with a superimposable core region. In addition, PHDs contain two loop regions (termed L1 and L3) that display increased flexibility and overlay less well between the three PHD structures available. These L1 and L3 regions correspond to variable regions identified earlier in PHD sequence alignments, indicating that L1 and L3 are probably not crucial for the PHD fold, but are instead likely to be responsible for imparting function(s) to the PHD. Indeed, numerous recent functional studies of PHDs from different proteins have since demonstrated their ability in binding a range of other proteins. In order to ascertain whether or not L1 and L3 were in fact dispensable for folding, we made extensive mutations (including both insertions and substitutions) in the loop regions of Mi2b-P2 and showed that the structure was maintained. We then went on to illustrate that a new function could be imparted to Mi2b-P2 by inserting a five-residue CtBP-binding motif into the L1 region and showed this chimera could fold and bind CtBP. Having established that the PHD could adopt a new binding function, we next sought to use combinatorial methods to introduce other novel functions into the PHD scaffold. Phage display was selected for this purpose, because it is a well-established technique and has been used successfully to engineer zinc-binding domains by other researchers. However, in order to establish this technique in our laboratory, we first chose a control system in which two partner proteins were already known to interact in vitro. We chose the protein complex formed between the transcriptional regulators LMO2 and ldb1 as a test case. We have examined this interaction in detail in our laboratory, and determined its three-dimensional structure. Furthermore, inappropriate formation of this complex is implicated in the onset of T-cell acute lymphoblastic leukemia. We therefore sought to use phage display to engineer ldb1 mimics that could potentially compete against wild-type ldb1 for LMO2, and this work is described in Chapter 4. Using a phage library containing ~3 x 10 7 variants of the LMO2-binding region of ldb1, we isolated mutants that were able to interact with LMO2 with higher affinity and specificity than wild-type ldb1. These ldb1 mutants represent a first step towards finding potential therapeutics for treating LMO-associated diseases. Having established phage display in our laboratory, we went on to search for PHD mutants that could bind selected target proteins. This work is described in Chapter 5. We created three PHD libraries with eight randomized residues in each of L1, L3 or in both loops of the PHD. These PHD libraries were then screened against four target proteins. After four rounds of selection, we were able to isolate a PHD mutant (dubbed L13-FH6) that could bind our test protein Fli-ets. This result demonstrates that a novel function can be imparted to the PHD using combinatorial methods and opens the way for further work in applying the PHD scaffold to other protein design work. In summary, the work detailed in Chapters 3 and 5 demonstrates that the PHD possesses many of the properties that are desirable for a protein scaffold for molecular recognition, including small size, stability, and a well-characterised structure. Moreover, the PHD motif possesses two loops (L1 and L3) of substantial size that can be remodeled for target binding. This may lead to an enhancement of binding affinities and specificities over other small scaffolds that have only one variable loop. In light of the fact that PHDs are mainly found in nuclear proteins, it is reasonable to expect that engineered PHDs could be expressed and function in an intracellular environment, unlike many other scaffolds that can only function in an oxidizing environment. Therefore, our results together with other currently available genomic and functional information indicate PHD is an excellent candidate for a scaffold that could be used to modify cellular processes. Appendices 1 and 2 describe completed bodies of work on unrelated projects that I have carried out during the course of my PhD candidature. The first comprises the invention and application of DNA sequences that contain all N-base sequences in the minimum possible length. This work is presented as a reprint of our recently published paper in Nucleic Acids Research. The second Appendix describes our structural analysis of an antifreeze protein from the shorthorn sculpin, a fish that lives in the Arctic and Antarctic oceans. This work is presented as a manuscript that is currently under review at the Journal of the American Chemical Society.
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Vera, Arboleda Anderson Arley. "Homomorphismes de type Johnson pour les surfaces et invariant perturbatif universel des variétés de dimension trois." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAD009/document.
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Soit Σ une surface compacte connexe orientée avec une seule composante du bord. Notons par M le groupe d'homéotopie de Σ. En considérant l'action de M sur le groupe fondamental de Σ, il est possible de définir différentes filtrations de M ainsi que des homomorphismes sur chaque terme de ces filtrations. Le but de cette thèse est double. En premier lieu, nous étudions deux filtrations de M : la " filtration de Johnson-Levine " introduite par Levine et la " filtration de Johnson alternative " introduite recemment par Habiro et Massuyeau. Les définitions de ces deux filtrations prennent en compte un corps en anses bordé par la surface. Nous nous référons à ces filtrations comme " filtrations de type Johnson " et les homomorphismes correspondants sont appelés " homomorphismes de type Johnson " par leur analogie avec la filtration de Johnson originale et les homomorphismes de Johnson usuels. Nous donnons une comparaison de la filtration de Johnson avec la filtration de Johnson-Levine au niveau du monoïde des cobordismes d'homologie de Σ. Nous donnons également une comparaison entre la filtration de Johnson alternative, la filtration Johnson-Levine et la filtration de Johnson au niveau du groupe d'homéotopie. Deuxièmement, nous étudions la relation entre les " homomorphismes de type Johnson" et l'extension fonctorielle de l'invariant perturbatif universel des variétés de dimension trois (l'invariant de Le-Murakami-Ohtsuki ou invariant LMO). Cette extension fonctorielle s'appelle le foncteur LMO et il prend ses valeurs dans une catégorie de diagrammes. Nous démontrons que les "homomorphismes de type Johnson " peuvent être lus dans la réduction arborée du foncteur LMO. En particulier, cela fournit une nouvelle grille de lecture de la réduction arborée du foncteur LMOLet Σ be a compact oriented surface with one boundary component and let M denote the mapping class group of Σ. By considering the action of M on the fundamental group of Σ it is possible to define different filtrations of M together with some homomorphisms on each term of the filtrations. The aim of this thesis is twofold. First, we study two filtrations of M : the « Johnson-Levine filtration » introduced by Levine and « the alternative Johsnon filtration » introduced recently by Habiro and Massuyeau. The definition of both filtrations involve a handlebody bounded by Σ. We refer to these filtrations as ≪ Johnson-type filtrations » and the corresponding homomorphisms have referred to as « Johnson-type homomorphisms » by their analogy with the original Johnson filtration and the usual Johnson homomorphisms. We provide a comparison of the Johnson filtration with the Johnson-Levine filtration at the level of the monoid of homology cobordisms of Σ. We also provide a comparison of the alternative Johnson filtration with the Johnson-Levine filtration and the Johnson filtration at the level of the mapping class group. Secondly, we study the relationship between the « Johnson-type homomorphisms » and the functorial extension of the universal perturbative invariant of 3-manifolds (the Le-Murakami-Ohtsuki invariant or LMO invariant). This functorial extension is calling the LMO functor and it takes values in a category of diagrams. We prove that the « Johnson-type homomorphisms » is in the tree reduction of the LMO functor. In particular, this provides a new reading grid of the tree reduction of the LMO functor
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Gieu, Jean-Baptiste. "Étude des interfaces électrode/électrolyte des batteries lithium-ion : cas de l'électrode à base de Li4Ti5O12." Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3043/document.
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Les batteries lithium-ion (Li-ion) sont privilégiées dans de nombreuses applications comme solution de stockage de l’énergie. Le composé Li4Ti5O12 (LTO) est une alternative au graphite qui demeure majoritairement utilisé comme matériau d’électrode négative dans les batteries Li-ion. Pour de potentielles applications à haute température, il est nécessaire d’étudier les couches interfaciales qui se forment dans ces conditions en surface des électrodes LTO. En effet, la formation de telles couches est un phénomène commun aux batteries Li-ion, dont la maîtrise revêt un rôle fondamental pour l’obtention de bonnes performances électrochimiques. La surface des électrodes LTO a pour cela été principalement caractérisée par Spectroscopie Photoélectronique à rayonnement X (XPS) et des analyses complémentaires ont aussi été ponctuellement menées en microscopie Auger à balayage (Scanning Auger Microscopy : SAM) pour l’acquisition de cartographies élémentaires et en spectrométrie de masse d’ions secondaires à temps de vol (Time-of-Flight Secondary Ions Spectrometry : ToF-SIMS) pour établir des profils de concentration élémentaires et moléculaires en profondeur. Ces résultats ont été systématiquement confrontés aux données électrochimiques. L’influence de différents paramètres sur les propriétés de la couche interfaciale formée en cyclage face au lithium a été évaluée. Une comparaison des couches interfaciales formées au premier cycle à température ambiante, 60 °C et 85 °C a ainsi montré qu’une température de cyclage plus élevée favorise la formation d’une couche interfaciale plus épaisse. L’utilisation d’un électrolyte contenant l’additif VC accélère la formation d’une SEI plus épaisse dès le premier cycle, moins sujette au phénomène de dissolution au cours de la délithiation et susceptible d'améliorer la rétention de capacité en longs cyclages. La substitution du sel de lithium LiPF6 par le sel LiTFSI entraîne la formation d’une couche plus fine, ce qui est principalement dû à une quantité de LiF déposée plus faible. De manière similaire, la substitution des solvants EC:DMC par les solvants PC:EMC, induit la formation d’une couche plus fine, du fait d’une quantité moins importante de LiF déposée. Par ailleurs, plus la surface spécifique de l’additif carboné entrant dans la composition des électrodes est élevée, plus la part de LiF parmi les espèces de la couche interfaciale formée est élevée, sans que cela n’influence son épaisseur. Puis, le comportement des interfaces électrode/électrolyte dans une batterie LiMn2O4/Li4Ti5O12 a finalement été étudié. Une couche interfaciale se forme en surface des deux électrodes. Néanmoins la couche formée sur l’électrode positive est plus fine que celle formée sur l’électrode négative. Leur composition est similaire, à l’exception du composé MnF2 uniquement détecté sur l’électrode négative et provenant d’un phénomène de dissolution du matériau LiMn2O4. Un prolongement de ce travail peut être envisagé concernant des électrodes à base de particules LTO avec différents coatings. De plus, une synergie systématique entre les trois techniques utilisées dans cette thèse pourra être encouragéeLithium-ion (Li-ion) batteries have been considered as the solution of choice for energy storage in numerous applications. Li4Ti5O12 (LTO) compound is an alternative to the widely used graphite, as a negative electrode material. For potential high temperature applications, the study of interfacial layers formed on top of LTO electrodes in such conditions is a necessary step. The formation of such surface layers is commonly observed in lithium-ion batteries and their properties are critical for maintaining good batteries performances. Therefore, LTO electrodes surfaces were mainly analyzed by X-ray Photoelectron Spectroscopy (XPS) and complementary measurements were performed by Scanning Auger Microscopy (SAM) for the acquisition of elemental mappings and by Time-of-Flight Secondary Ions Spectrometry (ToF-SIMS) for depth profile analysis. Surface analysis results were systematically linked to electrochemical data. The influence of several parameters was investigated for LTO electrodes cycled versus lithium. The comparison of surface layers formed during the first cycle at room temperature, 60 °C and 85 °C showed that higher cycling temperatures induce the formation of a thicker layer. The use of a VC-containing electrolyte accelerates the formation of a thicker layer since the first cycle, less prone to dissolution during delithiation and susceptible to enhance the capacity retention for long cycling. Substitution of LiPF6 lithium salt by LiTFSI leads to the formation of thinner layer, which is mainly due to a lower amount of deposited LiF. Similar results are obtained for the substitution of EC:DMC solvants by PC:EMC. Furthermore, the higher the specific surface of the electrode carbonaceous additive is, the higher the share of LiF in the interfacial layer composition is, even if its thickness remains similar. Finally, the behavior of electrode/electrolyte interfaces was studied in a LiMn2O4 /Li4Ti5O12 full cell. Interfacial layers are formed on the surface of both electrodes. Nevertheless, the layer on the positive electrode is thinner than the one on the negative electrode. Their composition are similar except for MnF2 compound, coming from LiMn2O4 dissolution at the positive electrode, which is only detected on the negative electrode. This work could be continued with the study of electrodes based on coated LTO particles. Moreover, a greater synergy between three characterization techniques used in this work could be promoted
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Zerrouki, Alan. "Compréhension et Optimisation du Procédé de Dépôt par Électrophorèse en Mode Pulsé en Milieu Aqueux de Nanoparticules Modèles et d'Intérêt Industriel." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK010.
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Ce travail de thèse s’inscrit dans le cadre d’une problématique industrielle visant à réaliser par voie électrophorétique des dépôts d’épaisseur micrométrique de matériaux d’électrodes de batterie au lithium. En raison de contraintes posées par l’utilisation de solvants organiques pour formuler à grande échelle des suspensions de nanoparticules céramiques, le procédé EPD (ElectroPhoretic Deposition) envisagé dans le contexte de ce travail fait appel à des suspensions colloïdales en milieu aqueux, ainsi qu’à une polarisation en régime pulsé afin de limiter le phénomène d’électrolyse de l’eau néfaste à l’obtention de dépôts denses.L’objectif de cette étude est d’optimiser le procédé EPD en termes de vitesse et de qualité de dépôt, en faisant appel à des suspensions modèles de nanoparticules de silice. Ainsi les conditions de synthèse de ces particules obtenues par la méthode Stöber ont été optimisées pour conférer aux nanoparticules des caractéristiques géométriques et physico-chimiques (potentiel zêta, point isoélectrique) très similaires aux nanomatériaux d’intérêt industriel.Les cinétiques de dépôt par EPD ont été simulées à travers un premier modèle par éléments finis et comparées à des retours d’expériences tant sur les suspensions monodisperses de nanoparticules de silice que sur des suspensions polydisperses de matériaux d’électrodes d’intérêt industriel. Un second modèle électrochimique a permis de simuler l’évolution du pH en surface d’électrode en régime pulsé et d’apporter une meilleure compréhension du procédé. L’hypothèse d’un mécanisme étendu de la théorie DLVO incluant une diminution du pH résultant de l’oxydation de l’eau a été mis en évidence dans le domaine des basses fréquences du régime pulsé. De plus, il a été montré que cette acidification peut être limitée en diminuant la valeur du rapport cyclique, donc en augmentant la période de relaxation du potentiel en régime pulsé, et en opérant à hautes fréquences (f > 1000 Hz).Finalement, une attention particulière a été portée sur la fissuration des dépôts qui intervient au cours de l’étape de séchage. L’utilisation de suspensions modèles polydisperses ou de conditions de séchage à humidité relative élevée ont permis d’améliorer la qualité des dépôts sans pour autant éliminer les fissures. En revanche, la résorption partielle des fissures a été observée en incorporant un polyélectrolyte anionique (la gomme xanthane) non adsorbé en surface des nanoparticules de silice ou un polymère neutre (le polyéthylène glycol, PEG) ayant une forte affinité pour la siliceThis thesis work is part of an industrial issue aiming to achieve micrometer-thick deposits of lithium battery electrode materials by electrophoretic deposition. Due to constraints related to the large-scale use of organic solvent suspensions of ceramic materials, the EPD (ElectroPhoretic Deposition) process considered in the context of this work involves colloidal suspensions of nanoparticles in an aqueous medium, as well as pulsed polarization to limit the harmful water electrolysis phenomenon in obtaining dense deposits.The objective of this study is to optimize the EPD process in terms of deposition yield and quality, using model suspensions of silica nanoparticles. Thus, the synthesis conditions of these particles obtained by the Stöber approach, were optimized to get geometric and physico-chemical characteristics (zeta potential, isoelectric point) very similar to the industrial materials of interest.The deposition kinetics by EPD were simulated through a first finite element model and compared to experimental data on both monodisperse silica nanoparticle suspensions and polydisperse suspensions of industrial electrode materials.A second electrochemical model allowed simulating the evolution of pH at the electrode surface in pulsed mode and providing a better understanding of the process. The hypothesis of an extended mechanism of the DLVO theory including a decrease in pH resulting from water oxidation was highlighted in the low-frequency range of the pulsed regime. Furthermore, it was shown that this acidification can be limited by decreasing the duty cycle, thus increasing the relaxation period of the potential in pulsed mode, and operating at high frequencies (f > 1000 Hz).Finally, particular attention was focused on the cracking of deposits that occurs during the drying stage. The use of polydisperse model suspensions or drying conditions at high relative humidity improved the quality of the deposits without eliminating the cracks. However, incorporating an anionic polyelectrolyte (xanthan gum) that is not adsorbed on the surface of silica nanoparticles or a neutral polymer (polyethylene glycol, PEG) having a high affinity for silica induced a partial decrease of the cracks
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Tuladhar, Kapil. "Lim-only domain proteins in developmental haematopoiesis." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:d6b73e89-7095-402f-9d9f-4d7837a4db00.
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The production of adult blood initiates from the haematopoietic stem cell (HSC). This clinically important cell has the capacity to maintain all blood lineages throughout the lifetime of an organism. HSCs emerge de novo from the haemogenic endothelium in the ventral wall of the embryonic dorsal aorta, from where they go on to seed adult sites of haematopoiesis. We have shown that Lmo4a is required for the emergence of HSCs in the zebrafish, and go on to demonstrate that Lmo4a regulates expression of the critical transcription factor, gata2a. Strikingly, both over- and under-expression of gata2a in the dorsal aorta severely diminishes HSC production. The LIM-only domain protein Lmo4 has previously been shown to interact with the known haematopoietic regulator, Ldb1. Together with our collaborators, we have identified novel binding partners of Lmo4 in mouse erythroleukaemic cells. Our functional analysis shows that many of these partners are also necessary for HSC emergence, thus revealing several new potential regulators of HSC formation. Given that these proteins were identified in an in vitro model of definitive erythropoiesis, it is remarkable that they also appear to act together in vivo at the level of HSC formation, and our data suggests that a transcriptional complex containing Lmo4 and these partners may directly repress gata2a. The related protein Lmo2 is also known to bind Ldb1. Together with Scl, Lmo2 is a master regulator of the haemangioblast programme. We have been utilising this activity, together with recent structural studies, to identify functionally important residues in the Lmo2 molecule. As a cell’s transcriptional programme drives both normal and pathological development, and misexpression of both Lmo2 and Lmo4 is involved in a variety of oncogenic states, the work presented in this thesis is likely to inform efforts to develop therapeutically relevant reagents.
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Mochizuki, Atsushi. "On the Casson-Walker invariant of 3-manifolds with genus one open book decompositions." Kyoto University, 2019. http://hdl.handle.net/2433/242583.
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尾野, 雄一. "急性T細胞性白血病におけるTAL1とLMOファミリーの協調的転写活性化機構の解析." 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/181174.
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要旨pdfファイル:タイトル「急性T細胞性白血病におけるTAL1とLMOファミリーの強調的転写活性化機構の解析」Kyoto University (京都大学)
0048
新制・論文博士
博士(理学)
乙第10366号
論理博第1382号
新制||理||1181(附属図書館)
UT51-2000-F432
(主査)教授 竹市 雅俊, 教授 井口 八郎, 教授 岡 穆宏
学位規則第4条第2項該当
Books on the topic "LMO"
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Cheptea, Dorin. A functorial LMO invariant for Lagrangian cobordisms. Kyoto, Japan: Research Institute for Mathematical Sciences, Kyoto University, 2007.
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Kim, Hong-jin. Ŭiyakpʻum chejo wŏllyoyong yujŏnja pyŏnhyŏng saengmulchʻe (LMO) anjŏn kwalli pangan yŏnʼgu =: Biosafety assessment of living modified organisms (LMO) used for biotechnological medicines. [Seoul]: Sikpʻum Ŭiyakpʻum Anjŏnchʻŏng, 2007.
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Chŏng, Hyŏn-mi. Yujŏnja pyŏnhyŏng saengmulch'e (LMO) ŭi chayŏn saengt'aegye yŏnghyang p'yŏngka mit anjŏn kwalli saŏp: Hwan'gyŏng chŏnghwayong yujŏnja pyŏnhyŏng singmulch'e ŭi chayŏn saengt'aegye yŏnghyang yŏn'gu (IV). [Inch'ŏn Kwangyŏksi]: Kungnip Hwan'gyŏng Kwahagwŏn, 2008.
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Barnett, Mac. Wei shen me ni kan bu jian Lio: Leo. Taibei Shi: San cai wen hua gu fen you xian gong si, 2016.
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Jie du Luo tuo Xiangzi. Beijing Shi: Jing hua chu ban she, 2001.
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Holdings et reprise d'enterprise: LBO-LMBO-Rachat par les cadres-intégration fiscale. Paris: Editions d'Organisation, 1988.
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United States. National Aeronautics and Space Administration., ed. Velocity deltas for LEO to L2, L3, L4, & L5, and LLO to L1 & L2. Houston, Tex: Eagle Engineering, Inc., 1989.
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Bi, Hua Liu. Wei lao yan lao. Hong Kong: Bo Yi, 1995.
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Lao qiang: Lao Qiang. Shanghai: Shanghai wen yi chu ban she, 1989.
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Lao tan: Lao tan. Beijing Shi: Ren min wen xue chu ban she, 2008.
Find full textBook chapters on the topic "LMO"
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Tartèse, Romain. "Water in the LMO." In Encyclopedia of Lunar Science, 1–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-05546-6_26-1.
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Tartèse, Romain. "Water in the LMO." In Encyclopedia of Lunar Science, 1257–65. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-319-14541-9_26.
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Lalitha, N. "Socioeconomic Assessment of Potential LMO Adopters in Gujarat." In Socio-Economic Impact Assessment of Genetically Modified Crops, 121–76. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9511-7_7.
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Davenport, Jesse. "Lunar Magma Ocean, Composition of the Bulk LMO." In Encyclopedia of Lunar Science, 1–7. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-05546-6_32-1.
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Davenport, Jesse. "Lunar Magma Ocean, Composition of the Bulk LMO." In Encyclopedia of Lunar Science, 681–88. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-319-14541-9_32.
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Rosado, André. "Interpreting Precision Breeding: Key Legal Concepts Under International Law and Current Domestic Regulatory Approaches in the Global South." In A Roadmap for Plant Genome Editing, 437–52. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-46150-7_26.
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AbstractIn various countries, especially in the Global South, there is legal uncertainty about which products or organisms derived from precision breeding, also called new breeding technologies, are subject to biosafety regulation. It is not clear whether which precision breeding products are classified as Living Modified Organisms (LMOs), or Genetically Modified Organisms (GMOs), and therefore be subject to regulatory oversight under biosafety laws.This section, under Chap. 3 of Policies and Regulations, provides an overview of key definitions under international and national legislation to clarify the regulatory status of precision breeding products. This is done by assessing provisions under international biosafety law and national legislation in selected countries in the Global South. The outcome of this section is to provide a baseline for further discussion about the regulatory status of precision breeding globally.First, the background is presented, covering the development of international and national legal frameworks governing biosafety of LMOs and GMOs. Second, the legal definition of LMO and related terms under international law is discussed. Third, the GMO definition of national law in selected jurisdictions is presented. Fourth, a snapshot of the emergence of regulations governing precision breeding in the Global South is analyzed. Finally, key future perspectives to the regulatory status of precision breeding products are suggested.
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Panczakiewicz, Artur, and Victor M. Anisimov. "The Linear Scaling Semiempirical LocalSCF Method and the Variational Finite LMO Approximation." In Challenges and Advances in Computational Chemistry and Physics, 409–37. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-2853-2_15.
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Vivekanandan, N., C. Srishailam, and R. G. Patil. "Intercomparison of MoM, MLM and LMO Estimators of Probability Distributions for Assessment of Extreme Rainfall." In Climate Change Impact on Water Resources, 423–36. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8524-9_34.
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Gilmour, Jess K. "Leo." In The Practical Astronomer’s Deep-sky Companion, 69–71. London: Springer London, 2003. http://dx.doi.org/10.1007/978-1-4471-0071-3_23.
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Walters, Robert, and Marko Novak. "Lao." In Cyber Security, Artificial Intelligence, Data Protection & the Law, 249–60. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1665-5_10.
Full textConference papers on the topic "LMO"
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Eshghinejad, Ahmadreza, Wen-I. Liang, Qian Nataly Chen, Feiyue Ma, Ying-Hao Chu, and Jiangyu Li. "Probing Multiferroic Heterostructures of BiFeO3-LiMn2O4 Using Magnetic, Piezoelectric and Piezomagnetic Force Microscopies." In ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/smasis2014-7513.
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In this study magnetic force microscopy (MFM), piezoresponse force microscopy (PFM), and the newly developed piezomagnetic force microscopy (PmFM) techniques are used to probe the ferroelectric and ferromagnetic properties of BiFeO3-LiMn2O4 (BFO-LMO) heterostructures at nano-scale. The PmFM technique is also used to probe the ferromagnetic properties of CoFe2O4 (CFO) as a case study. The PFM and PmFM mappings of the BFO-LMO heterostructures clearly distinguish the BFO matrix and LMO nanopillars while the MFM mapping is ambiguous. The relatively high piezomagnetic response of BFO matrix is believed to be due to the Mn doping while the piezoelectric-like response of LMO nanopillars is due to the ionic activities and the vertical geometry of its heterostructure. Lastly, limitations of the PmFM technique are discussed.
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Jibhakate, Piyush D., and George J. Nelson. "Fabrication and Characterization of Nanostructured Cathodes for Li-Ion Batteries." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67873.
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Li-ion batteries have emerged as a leading energy storage technology for several applications including portable electronics devices and electric vehicles. Rigorous efforts are made to develop these batteries with higher energy density, higher power density, and better cycling stability while reducing cost and environmental impact. To better understand how electrode microstructure contributes to the electrode performance, the spinel LiMn2O4 (LMO) cathode material was prepared using a template-assisted sol-gel synthesis method. This method involves soaking of polycarbonate template membranes in the precursor solution followed by drying, to remove the solvent. The dried templates containing precursor materials were etched in an oxygen plasma to remove the template, and the nanostructured electrode formed was then calcined to convert these nanostructures to spinel LiMn2O4. Simultaneously, powdered LMO was prepared using the same synthesis procedure, but without the aid of a template to control electrode morphology. A series of tests were performed to study the effect of processing conditions on the structure and morphology of the nanostructured electrodes. The resulting electrodes were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM) in support of efforts to understand the effects of process parameters on the electrochemical performance of the electrode. The template assisted synthesis approach yielded an electrode of well-defined nanotubules. Extending the template soaking time was found to provide better definition of individual tubule structures. Increasing calcination temperature was found to create a better defined spinel structure for the LMO. These observations provide insight into process parameters relevant to electrode preparation and substrate selection when producing nanostructured electrodes using template-assisted methods.
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Surampudi, Ph.D., Bapiraju, Yanyu Wang Ph.D., Dustin Kramer, and Ian Smith. "Analysis of overcharge tolerance of aged LMO cells with Examples." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. 10-2 Gobancho, Chiyoda-ku, Tokyo, Japan: Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0108.
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<div class="section abstract"><div class="htmlview paragraph">The capacity of a lithium-ion battery decreases during cycling. This capacity loss or fade occurs due to several different mechanisms associated with unwanted side reactions that occur in these batteries. The same reactions occur during overcharge and cause electrolyte decomposition, passive film formation, active material dissolution, and other phenomena. As the battery ages the accuracy of state of charge prediction decreases and vulnerability to persistent overcharge increases. Moreover, as the battery ages, its tolerance to such unintended overcharge changes. This tolerance depends on the nature of the history of cycle and calendar aging. A map of this tolerance in the BMS can provide awareness of the factor of safety due to overcharge as battery ages. Signatures of early warning signs of incipient thermal runaway due to overcharge can also be very useful features in a BMS. The SwRI EssEs-I consortium conducted aging of two commercially available LMO cell types with different calendar and cycle conditions. These cells were tested with the SAE 2464 3C overcharge procedure at BOL and EOL stages, but at an ambient temperature of 50 °C.</div><div class="htmlview paragraph">The primary objective of this work was to investigate LMO cells for overcharge tolerance after aging. The secondary objective was to study to notice trends and correlations of overcharge tolerance to capacity, temperature, ΔSOC, charge/discharge power during aging.</div><div class="htmlview paragraph">A very strong correlation was established between Ah to failure and EOL Ah. This makes sense since amount of life degradation makes the cell more vulnerable to failure. Scatter between samples seem to increase with EOL capacity. Tolerance to overcharge for cell type #2 seem to be closer to 45 °C than 55 °C indicating a need for close thermal management in aged packs. Calendar aging seemed to be more dominant in determining the tolerance to overcharge than cycle aging.</div></div>
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Chen, F., Z. Ye, Y. Zhang, R. Zhang, Z. Zhou, and W. Wang. "High Accuracy LMO-Based Multi-Parameter Inversion for OBN Data." In 85th EAGE Annual Conference & Exhibition - Workshop Programme. European Association of Geoscientists & Engineers, 2024. http://dx.doi.org/10.3997/2214-4609.202410973.
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Zhao, Yixin, and Sara Behdad. "Electric Vehicle Battery Simulation: How Electrode Porosity and Thickness Impact Cost and Performance." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-71511.
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Abstract Lithium-ion batteries almost exclusively power today’s electric vehicles (EVs). Cutting battery costs is crucial to the promotion of EVs. This paper aims to develop potential solutions to lower the cost and improve battery performance by investigating its design variables: positive electrode porosity and thickness. The open-access lithium-ion battery design and cost model (BatPac) from the Argonne National Laboratory of the United States Department of Energy, has been used for the analyses. Six pouch battery systems with different positive materials are compared in this study (LMO, LFP, NMC 532/LMO, NMC 622, NMC 811, and NCA). Despite their higher positive active material price, nickel-rich batteries (NMC 622, NMC 811, and NCA) present a cheaper total pack cost per kilowatt-hour than other batteries. The higher thickness and lower porosity can reduce the battery cost, enhance the specific energy, lower the battery mass but increase the performance instability. The reliability of the results in this study is proven by comparing estimated and actual commercial EV battery parameters. In addition to the positive electrode thickness and porosity, six other factors that affect the battery’s cost and performance have been discussed. They include energy storage, negative electrode porosity, separator thickness and porosity, and negative and positive current collector thickness.
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Taira, T. "Thick periodically poled MgO-doped LMO/sub 3/ devices and their applications." In 2005 IEEE LEOS Annual Meeting. IEEE, 2005. http://dx.doi.org/10.1109/leos.2005.1548096.
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Lindi, Hadi Azizpour, Farzaneh Bayati, and Hamid R. Siahkoohi. "Attenuating GR by using SVD in F-X domain after applying LMO." In Istanbul 2012 - International Geophysical Conference and Oil & Gas Exhibition. Society of Exploration Geophysicists and The Chamber of Geophysical Engineers of Turkey, 2012. http://dx.doi.org/10.1190/ist092012-001.42.
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Aguirre, Myriam. "Probing the interface influence on magnetoelectric coupling at the BFO/LMO systems." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.1465.
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Lu, Lu, and Jianhui Yu. "Analysis of Automatic Depressurization System Stage 4 Valves Inadvertent Actuation Scenario for a Certain Passive Power Plant." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15841.
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The automatic depressurization system (ADS) stage 4 valves inadvertent actuation scenario is one of the risk-significant cases in probabilistic risk assessment (PRA) analysis of passive power plant. Based on mini-ASTRUM (automated statistical treatment of uncertainty method) and CQD (code qualification document) method together, the calculation which utilizing WCOBRA/TRAC and HOTSPOT codes has been made in this paper. And the results indicate that, the calculated peak cladding temperature (PCT), local maximum oxidation (LMO), and core-wide oxidation (CWO) are all low enough, which meet the three design acceptance criteria defined in 10 CFR 50.46 emergency core cooling system (ECCS).
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Kricker, Andrew. "A surgery formula for the 2–loop piece of the LMO invariant of a pair." In Invariants of Knots and 3--manifolds. Mathematical Sciences Publishers, 2002. http://dx.doi.org/10.2140/gtm.2002.4.161.
Full textReports on the topic "LMO"
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Anderson, Bogi. The Role of a LIM Only Factor, LMO-4, in Breast Cancer. Fort Belvoir, VA: Defense Technical Information Center, October 2004. http://dx.doi.org/10.21236/ada431446.
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Cresce, Arthur, Glenn Pastel, and Marshall Schroeder. An Additive Study for Water-in-Salt Electrolyte (WiSE) with Lithium Manganese Oxide (LMO) and Titanium Niobate (TNO) Electrodes. Aberdeen Proving Ground, MD: DEVCOM Army Research Laboratory, December 2022. http://dx.doi.org/10.21236/ad1189023.
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Smith, Troy. MK46 MOD0 (LMG). Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada386349.
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Lang, J., ed. Link Management Protocol (LMP). RFC Editor, October 2005. http://dx.doi.org/10.17487/rfc4204.
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Nipper, Ronald M. Leo Marquez: Air Force Logistician. Fort Belvoir, VA: Defense Technical Information Center, May 1988. http://dx.doi.org/10.21236/ada202095.
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Cristiano-Botia, Deicy J., Manuel Dario Hernandez-Bejarano, and Mario A. Ramos-Veloza. Labor Market Indicator for Colombia (LMI). Banco de la República de Colombia, December 2020. http://dx.doi.org/10.32468/be.1152.
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We construct the Labor Market Indicator (LMI) focusing on the cyclical similarities of eighteen time series from household, industrial, and opinion surveys between 2001 and 2019. The LMI summarizes the growth cycle of the labor market as defined by \cite{mintz} and is connected to the evolution of the traditional business cycle indicators as well as to that of the GDP and the Unemployment rate GAP. The evolution of the indicator provide useful information to policy makers, as it complements the characterization of expansions and turning points. Thus, improving the analysis of the current momentum of the labor market.
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Lee, E. P. Heavy ion driven LMF design concept. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/5729224.
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Lee, E. P. Heavy ion driven LMF design concept. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10129707.
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Mintii, Iryna S., Svitlana V. Shokaliuk, Tetiana A. Vakaliuk, Mykhailo M. Mintii, and Vladimir N. Soloviev. Import test questions into Moodle LMS. [б. в.], September 2019. http://dx.doi.org/10.31812/123456789/3271.
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The purpose of the study is to highlight the theoretical and methodological aspects of preparing the test questions of the most common types in the form of text files for further import into learning management system (LMS) Moodle. The subject of the research is the automated filling of the Moodle LMS test database. The objectives of the study: to analyze the import files of test questions, their advantages and disadvantages; to develop guidelines for the preparation of test questions of common types in the form of text files for further import into Moodle LMS. The action algorithms for importing questions and instructions for submitting question files in such formats as Aiken, GIFT, Moodle XML, “True/False” questions, “Multiple Choice” (one of many and many of many), “Matching”, with an open answer – “Numerical” or “Short answer” and “Essay” are offered in this article. The formats for submitting questions, examples of its designing and developed questions were demonstrated in view mode in Moodle LMS.
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Meisel-Roca, Adolfo, and María Aguilera-Díaz. Cartagena, 2005-2018: Lo bueno, lo regular y lo malo. Banco de la República de Colombia, December 2020. http://dx.doi.org/10.32468/dtseru.294.
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En las dos primeras décadas del siglo XXI Cartagena presentó un crecimiento económico sin precedentes. No obstante, la prosperidad fue desigual y un alto porcentaje de la población aún presenta enormes carencias y vive en la pobreza. Esta investigación se enfoca en el estudio del avance económico de la ciudad y, a la vez, en el estancamiento relativo en materia social, durante el periodo 2005 y 2018, usando la información de los dos últimos censos de población y comparando con cinco de las principales ciudades de Colombia. En la ciudad se realizaron grandes inversiones de capital en los sectores industrial, construcción y logística portuaria que ampliaron la capacidad productiva local. Por el lado de los indicadores sociales, se dieron avances en la cobertura en educación y salud, pero sin mejorías significativas en la calidad de esos servicios. En buena medida, lo anterior podría ser un resultado de los constantes cambios de alcalde, lo cual llevó a una baja gobernabilidad que impediría que la administración distrital pudiera proveer los bienes y servicios necesarios para mejorar la calidad de vida de la población más vulnerable.