Relevant bibliographies by topics / L12 Compounds

Academic literature on the topic 'L12 Compounds'

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Published: 6 September 2023

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Journal articles on the topic "L12 Compounds"

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Watanabe, Yoshimi. "Review, Role of L12 Modified (Al1−xMex)3Ti Intermetallic Compounds on Heterogeneous Nucleation of Alpha Aluminum Grains." MATEC Web of Conferences 326 (2020): 06008. http://dx.doi.org/10.1051/matecconf/202032606008.

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Al3Ti intermetallic compound with the tetragonal D022 structure undergoes a phase transformation to the high-symmetry L12 cubic structure by addition of third elements, Me. The lattice constants of some L12 modified (Al1−xMex)3Ti intermetallic compounds are closed to that of alpha aluminum. Therefore, it is expected that the addition of L12 modified (Al1−xMex)3Ti intermetallic compound particles show good grain refining performance of cast aluminum. In this paper, our recent results on novel refines containing heterogeneous nucleation site particles of L12 modified (Al1−xMex)3Ti intermetallic compounds have been reviewed.
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Abdank-Kozubski, Rafal, Mirosław Kozłowski, S. Czekaj, Veronique Pierron-Bohnes, and Wolfgang Pfeiler. "Atomic Migration as a Mechanism of Superstructure Formation in Intermetallic Compounds." Defect and Diffusion Forum 237-240 (April 2005): 609–20. http://dx.doi.org/10.4028/www.scientific.net/ddf.237-240.609.

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“Order-order” relaxations driven by atomic migration in superstructures proceed in nonsteady- state of a system, which relaxes to the equilibrium atomic configuration. Hence, the corresponding studies are complementary to standard steady-state diffusion investigations. Two time scales operating in “order-order” relaxations in L12-ordered (Ni3Al) and L10-ordered (FePd, FePt) binary intermetallics were experimentally observed. On the other hand, in B2-ordered NiAl – known of a giant vacancy concentration, “order-order” relaxations appeared surprisingly slow. Definite relationships between the activation energies for diffusion ( ) D A E and “order-order” relaxations ( ) O O A E − were revealed: ( ) D A E < ( ) O O A E − in L12-type superstructure; ( ) D A E ³ ( ) O O A E − in L10- and in B2-type superstructures. Corresponding simulation studies elucidated the specific atomistic mechanism of the processes. It has been shown that different time scales active in “order-order” relaxations in L12 and L10-ordered systems follow from specific atomic-jump correlations, which result from non-steady-state conditions and particular superlattice geometries: the availability of easy diffusion channels. A model of “order-order” kinetics in NiAl as controlled by a triple-defect mechanism is proposed.
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Kumer, Ajoy, Unesco Chakma, Md Masud Rana, Akhel Chandro, Shopnil Akash, Mona M. Elseehy, Sarah Albogami, and Ahmed M. El-Shehawi. "Investigation of the New Inhibitors by Sulfadiazine and Modified Derivatives of α-D-glucopyranoside for White Spot Syndrome Virus Disease of Shrimp by In Silico: Quantum Calculations, Molecular Docking, ADMET and Molecular Dynamics Study." Molecules 27, no. 12 (June 8, 2022): 3694. http://dx.doi.org/10.3390/molecules27123694.

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The α-D-glucopyranoside and its derivatives were as the cardinal investigation for developing an effective medication to treat the highest deadly white spot syndrome virus (WSSV) diseases in Shrimp. In our forthcoming work, both computational tools, such as molecular docking, quantum calculations, pharmaceutical kinetics, ADMET, and their molecular dynamics, as well as the experimental trial against WSSV, were executed to develop novel inhibitors. In the beginning, molecular docking was carried out to determine inhibitors of the four targeted proteins of WSSV (PDB ID: 2ED6, 2GJ2, 2GJI, and 2EDM), and to determine the binding energies and interactions of ligands and proteins after docking. The range of binding affinity was found to be between −5.40 and −7.00 kcal/mol for the protein 2DEM, from −5.10 to 6.90 kcal/mol for the protein 2GJ2, from −4.70 to −6.2 kcal/mol against 2GJI, and from −5.5 kcal/mol to −6.6 kcal/mol for the evolved protein 2ED6 whereas the L01 and L03 display the highest binding energy in the protein 2EDM. After that, the top-ranked compounds (L01, L02, L03, L04, and L05), based on their high binding energies, were tested for molecular dynamics (MD) simulations of 100 ns to verify the docking validation and stability of the docked complex by calculating the root mean square deviation (RMSD) and root mean square fluctuation (RMSF). The molecules with the highest binding energy were then picked and compared to the standard drugs that were been applied to fish experimentally to evaluate the treatment at various doses. Consequently, approximately 40–45% cure rate was obtained by applying the dose of oxytetracycline (OTC) 50% with vitamin C with the 10.0 g/kg feed for 10 days. These drugs (L09 to L12) have also been executed for molecular docking to compare with α-D-glucopyranoside and its derivatives (L01 to L08). Next, the evaluation of pharmacokinetic parameters, such as drug-likeness and Lipinski’s principles; absorption; distribution; metabolism; excretion; and toxicity (ADMET) factors, were employed gradually to further evaluate their suitability as inhibitors. It was discovered that all ligands (L01 to L12) were devoid of hepatotoxicity, and the AMES toxicity excluded L05. Additionally, all of the compounds convey a significant aqueous solubility and cannot permeate the blood-brain barrier. Moreover, quantum calculations based on density functional theory (DFT) provide the most solid evidence and testimony regarding their chemical stability, chemical reactivity, biological relevance, reactive nature and specific part of reactivity. The computational and virtual screenings for in silico study reveals that these chosen compounds (L01 to L08) have conducted the inhibitory effect to convey as a possible medication against the WSSV than existing drugs (L09, L10, L11 and L12) in the market. Next the drugs (L09, L10, L11 and L12) have been used in trials.
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Yamanaka, Syuki, Ken-ichi Ikeda, and Seiji Miura. "Effect of Multi-Elements Substitution on the Mechanical Properties of Intermetallic Compound." MRS Advances 4, no. 25-26 (2019): 1497–502. http://dx.doi.org/10.1557/adv.2019.119.

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ABSTRACTIt is well known that various elements substitute for a certain sub-lattice of intermetallic compounds. There have been various experimental investigations of the effects of substituted elements on mechanical properties, however, there are few reports describing the effects of multi-element substitution. In the present study, L12-type compounds A3B (Ni3Al and Co3(Al,W)) were selected as model compounds because their substitution behavior is well known. It was reported that various elements such as Ni, Co, Cu, Pd and Pt occupy the A-site, whereas Al, Si, Ga, Ge, Ti, V, Nb, Ta, Mo, and W occupy the B-site. These elements are expected to introduce local lattice distortion, which may affect the motion of dislocations over a wide range of temperatures. Several alloys composed of five or more elements including Ni, Co, Al, Mo, and W, were prepared using an Ar-arc melting machine and heat-treated. Several alloys were found to include an (Ni, Co)3(Al, Mo, W, …)-L12 compound as a constituent phase. The nano-hardness of these L12 phases was higher than that of the high-strength Co3(Al,W)-L12 compound, confirming that multi-element substitution is an effective way to improve the mechanical properties of an intermetallic compound without decreasing the phase stability.
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Reeta, Seung Cheol Baek, Jae Pil Lee, T. M. Rangarajan, Ayushee, Rishi Pal Singh, Manjula Singh, et al. "Ethyl Acetohydroxamate Incorporated Chalcones: Unveiling a Novel Class of Chalcones for Multitarget Monoamine Oxidase-B Inhibitors Against Alzheimer’s Disease." CNS & Neurological Disorders - Drug Targets 18, no. 8 (December 30, 2019): 643–54. http://dx.doi.org/10.2174/1871527318666190906101326.

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Background: Chalcones are considered as the selective scaffold for the inhibition of MAO-B. Objective: A previously synthesized ethyl acetohydroxamate-chalcones (L1-L22) were studied for their inhibitory activities against human recombinant monoamine oxidase A and B (hMAO-A and hMAO-B, respectively) and acetylcholinesterase (AChE) as multi-target directed ligands for the treatment of Alzheimer’s Disease (AD). Methods: Enzyme inhibition studies of MAO-A, MAO-B and AChE is carried out. Computational studies such as Molecular docking, Molecular Mechanics/Generalized Born Surface Area calculations, ADMET prediction, and protein target prediction are also performed. Results: Among the screened compounds, compound L3 has most potent hMAO-B inhibition with an IC50 value of 0.028 ± 0.0016 µM, and other compounds, L1, L2, L4, L8, L12, and L21 showed significant potent hMAO-B inhibition with IC50 values of 0.051 ± 0.0014, 0.086 ± 0.0035, 0.036 ± 0.0011, 0.096 ± 0.0061, 0.083 ± 0.0016, and 0.038 ± 0.0021 µM, respectively. On the other hand, among the tested compounds, compound L13 showed highest hMAO-A inhibition with an IC50 value of 0.51± 0.051 µM and L9 has a significant value of 1.85 ± 0.045 µM. However, the compounds L3 and L4 only showed high selectivities for hMAO-B with Selectivity Index (SI) values of 621.4 and 416.7, respectively. Among the substituents in ring A of ethyl acetohydroxamate-chalcones (L1-L9), F atom at p-position (L3) showed highest inhibitory effect against hMAO-B. This result supports the uniqness and bizarre behavior of fluorine. Moreover, chalcones L3, L4, L9, L11, and L12 showed potential AChE inhibitory effect with IC50 values of 0.67, 0.85, 0.39, 0.30, and 0.45 µM, respectively. Inhibitions of hMAO-B by L3 or L4 were recovered to the level of the reversible reference (lazabemide), and were competitive with Ki values of 0.0030 ± 0.0002 and 0.0046 ± 0.0005 µM, respectively. Inhibitions of AChE by L3 and L11 were of the competitive and mixed types with Ki values of 0.30 ± 0.044 and 0.14 ± 0.0054 µM, respectively. Conclusion: The studies indicated that L3 and L4 are considered to be promising multitarget drug molecules with potent, selective, and reversible competitive inhibitors of hMAO-B and with highly potent AChE inhibitory effect.
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Balagurov, Anatoly M., Nataliya Yu Samoylova, Ivan A. Bobrikov, Sergey V. Sumnikov, and Igor S. Golovin. "The first- and second-order isothermal phase transitions in Fe3Ga-type compounds." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 6 (November 9, 2019): 1024–33. http://dx.doi.org/10.1107/s2052520619013106.

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Structural features and kinetics of the transition between ordered metastable b.c.c.-derived D03 and equilibrium f.c.c.-derived L12 phases of Fe–xGa alloys (x = 27.2% and 28.0%) have been analyzed by in situ real-time neutron diffraction during isothermal annealing in the temperature range 405–470°C. It has been revealed that the transition proceeds with alternation of the first- and second-order phase transformations according to a D03 → A2 → A1 → L12 scheme, where A2 and A1 are disordered b.c.c. and f.c.c. structures. Deformations of the crystal lattice that arise due to these transitions are determined. The kinetics of the L12 phase nucleation and growth were analyzed in the frame of the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model; however, only the early stage of the D03 → L12 transition is well described by the JMAK equation. The value of the Avrami exponent corresponds to the constant growth rate of the new L12 phase and decreasing nucleation rate in the Fe–27.2Ga alloy and indicates the presence of pre-existing nucleation centres of the L12 phase in the Fe–28.0Ga alloy.
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Carlsson, A. E., and P. J. Meschter. "Relative stability of LI2, DO22, and DO23 structures in MAl3 compounds." Journal of Materials Research 4, no. 5 (October 1989): 1060–63. http://dx.doi.org/10.1557/jmr.1989.1060.

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The structural energy differences between cubic LI2 and tetragonal DO22 crystal structures are calculated for MAl3 compounds, where M is a group III, IV, or V transition metal. The stability of the DO22 structure relative to L12 increases rapidly as the transition-metal d-electron count increases. Typical values of E(DO22) – E(L12) are 0.1–0.15 eV/atom (9600–14500 J/g-atom) for group III,  0.05 eV/atom ( 4800 J/g-atom) for group IV, and ∼ –0.2 eV/atom (∼ –19000 J/g-atom) for group V trialuminides. Similar trends are calculated for the DO23/L12 energy difference. The calculated electronic densities of states (DOS) show that each structure has a minimum in the DOS distribution at a characteristic d-electron count. The preferred crystal structure for a given compound is the one in which the Fermi level lies in the minimum.
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Yang, Yunfei, Changhao Wang, Junhao Sun, Shilei Li, Wei Liu, Hao Wu, and Jinshu Wang. "First-Principles Study of Mechanical and Thermodynamic Properties of Binary and Ternary CoX (X = W and Mo) Intermetallic Compounds." Materials 14, no. 6 (March 13, 2021): 1404. http://dx.doi.org/10.3390/ma14061404.

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In this study, the structural, elastic, and thermodynamic properties of DO19 and L12 structured Co3X (X = W, Mo or both W and Mo) and μ structured Co7X6 were investigated using the density functional theory implemented in the pseudo-potential plane wave. The obtained lattice constants were observed to be in good agreement with the available experimental data. With respect to the calculated mechanical properties and Poisson’s ratio, the DO19-Co3X, L12-Co3X, and μ-Co7X6 compounds were noted to be mechanically stable and possessed an optimal ductile behavior; however, L12-Co3X exhibited higher strength and brittleness than DO19-Co3X. Moreover, the quasi-harmonic Debye–Grüneisen approach was confirmed to be valid in describing the temperature-dependent thermodynamic properties of the Co3X and Co7X6 compounds, including heat capacity, vibrational entropy, and Gibbs free energy. Based on the calculated Gibbs free energy of DO19-Co3X and L12-Co7X6, the phase transformation temperatures for DO19-Co3X to L12-Co7X6 were determined and obtained values were noted to match well with the experiment results.
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Izumi, Osamu, and Takayuki Takasugi. "Mechanisms of ductility improvement in L12 compounds." Journal of Materials Research 3, no. 3 (June 1988): 426–40. http://dx.doi.org/10.1557/jmr.1988.0426.

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The present article first describes some characteristics of structure, chemistry, and electronic (bond) nature for grain boundaries in the A3B Li2-type intermetallic compounds. Next, the phenomenological aspects for the grain boundary brittleness of the Li2-type intermetallic compounds are reviewed with respect to the combination of the constituent atoms, the alloying effect, the stoichiometry effect, and a role of impurity or gaseous atoms. It is emphasized that the brittleness of grain boundaries in the intermetallic compounds is directly controlled by the atomistic and electronic structures at grain boundary regions. Based on these systematic investigations, it is suggested that the brittleness of the Li2-type intermetallic compounds can be manipulated by appropriate control of composition and the corresponding electrochemical bond environment at grain boundary planes and by control of test environment. Furthermore, some examples of the materials development are described.
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Himuro, Yoshiyuki, Katsumi Koyama, and Yoichiro Bekki. "Precipitation Behaviour of Zirconium Compounds in Zr-Bearing Al-Mg-Si Alloy." Materials Science Forum 519-521 (July 2006): 501–6. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.501.

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In commercial aluminum alloys, Zr is recognized as an important additional element improving their properties such as strength, corrosion resistivily, and so on. It forms very fine particles of the metastable Al3Zr phase with L12 ordered configuration, in the case of alloys without Si. On the other hand, the DO22-type (Al, Si)3Zr phase besides the L12-type Al3Zr phase is precipitated in alloys including large amounts of Si, such as 6000 series. In this study the main stress falls on precipitation behavior of these Zr compounds in a Zr bearing Al-Mg-Si alloy. The Al-0.67Mg-0.97Si-0.37Zr alloy was cast into a metal mold and hot-rolled to a 5 mm thick plate. A lot of fine L12-type Al3Zr particles were coherently precipitated in the matrix by aging the plate at 673K. The aged plate was cold-rolled to a 1 mm thick sheet and annealed at 553-813K, and then microstructure was investigated by using a transmission electron microscope. It was realized that fine coherent L12-type Al3Zr particles are transformed to incoherent and coarse DO22-type (Al, Si)3Zr particles through recrystallization. The DO22-type (Al, Si)3Zr particles reduced recrystallized grain size owing to their pinning effect.
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Dissertations / Theses on the topic "L12 Compounds"

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Jiang, Xia. "Cadmium jump frequencies in L1₂ intermetallic compounds." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/x_jiang_042408.pdf.

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Salomaa-Robertson, Terhi. "L2 acquisition of Spanish compounds by native speakers of Finnish." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ57173.pdf.

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Lu, Yeong-Wei. "Sorption of organic compounds on oil shale materials and sorption of selected chemicals on a Western soil." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91135.

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The sorption capacity of a raw shale (Anvil Points), three spent shales, (Antrim, Oxy 6, and Run 16), and a western soil for three organic compounds (2-Hydroxynaphthalene, 1,2,3,4-Tetrahydroquinoline, and 2,3,5-Trimethylphenol) was evaluated by batch and column sorption studies. In addition, the sorption capacity of the western soil for selected inorganic agents (arsenic, cadmium, calcium, potassium, iron, ammonium, fluoride, and sulfate) was also determined. The results of the study showed that the sorption capacity of oil shales for organic compounds varied with the retorting conditions of spent shales, the characteristics of sorbates, and the number of different sorbates present. The overall sorption capacity of the oil shales and the soil were greatly enhanced in multi-sorbate solutions. On the other hand, mutual inhibition for sorption of individual compounds was evident throughout the study. The western soil, in general, exhibited a better sorption capacity for organic compounds than Anvil, Oxy 6, and Run 16 shale, yet Antrim shale appeared to be the best sorbent. Sorption of inorganic ions by soil was closely related to the pH of the solution, and was greatly affected by the interactions between ion species in multi-sorbate solutions. The soil had good affinity for arsenic, cadmium and iron, but little sorption capacity for ammonium and sulfate. Desorption of calcium and potassium from the soil was evident.
M. Eng.
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Ngan, Alfonso Hing-wan. "The temperature dependence of yield strength in L1 [inferior] 2 compounds." Thesis, University of Birmingham, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658066.

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Pannier, Andy Joseph. "Reductive transformation of 2,4,6-Trinitrotoluene by Yarrowia lipolytica AN-L15 under conditions of different initial pH of the culture medium or in the presence of ferrihydrite." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/pannier/PannierA0509.pdf.

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Batch and column studies were conducted to examine the difference in the transformation pathways of 2,4,6-trinitrotoluene (TNT) reduction by a hemiascomycetous yeast (Yarrowia lipolytica AN-L15) under conditions of different initial pH of the culture medium or in the presence or absence of ferrihydrite. Using high performance liquid chromatography (HPLC), it was observed that Y. lipolytica AN-L15 was able to transform TNT at three different initial proton concentrations of the culture medium: pH 7.0, pH 6.5, and pH 4.5. In the presence of TNT, Y. lipolytica AN-L15 showed preferential growth (OD₆₀₀) at the lower initial pH of 4.5. The increased growth (OD₆₀₀) resulted in increased reduction of TNT-metabolites in the culture medium with an initial pH of 4.5, as compared to, the culture medium with an initial pH of 6.5 or the culture medium with an initial pH of 7.0. TNT transformation via aromatic ring reduction was the major transformation pathway observed, with the major metabolite being 3-H̄ -TNT. 4-hydroxylaminodinitrotoluene (4-HADNT) was the major metabolite of the nitro-group reduction pathway. In the presence of ferrihydrite at a pH of 7.0, the transformation of TNT by Y. lipolytica AN-L15 showed a change in the transformation pathway. Nitro-group reduction was the major pathway of TNT transformation in the presence of ferrihydrite with 4-HADNT and 2-aminodinitrotoluene (4-ADNT) being the major metabolites formed. The time it took to reduce TNT was longer and the concentrations of TNT-metabolites were lower in the presence of ferrihydrite than in its absence. This may have been due to competition for available electrons between TNT and TNT-metabolites and Fe(III). It is also possible that some of the intermediate products of TNT transformation were oxidized back to TNT-metabolites by Fe(III) resulting in lower concentrations of TNT-metabolites and increased concentrations of Fe(II). This study demonstrates the complexity of the interactions of various environmental parameters, under controlled laboratory conditions, in the transformation of TNT by Y. lipolytica AN-L15.
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Garimella, Narayana. "Multicomponent interdiffusion in austenitic Ni-, Fe-Ni-base alloys and L1₂-Ni₃Al intermetallic for high-temperature applications." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002521.

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Lence, Nicole Louise. "IMPACT OF GINGER-RELATED COMPOUNDS, ZINGERONE AND CURCUMIN, ON PPARγ ACTIVATION, LIPID ACCUMULATION, AND CELL VIABILITY IN 3T3-L1 FIBROBLASTS." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1227.

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The prevalence over overweight and obesity has risen dramatically during the past few decades corresponding with a clustering of metabolic pathologies including cardiovascular disease, type 2 diabetes, endometrial, breast, and colon cancers. Obesity is not only implicated as one of the primary causes of these degenerative diseases but also represents a major component of the metabolic syndrome. In obesity, the primary defect leading to these metabolic pathologies appears to be an impairment of adipogenesis resulting in adipocyte hypertrophy and dysfunction. Current pharmacological therapies prescribed for T2DM, such as thiazolidinones (TZDs), improve insulin sensitivity through regulation of adipogenesis. However, utilization of these drugs is often associated with several side effects, including weight gain, liver disease, and bone loss. Thus, there is an important need to identify alternative therapies that can modify these adipogenic regulators without adverse complications. Ginger (Zingiber officinale Roscoe), a member of the Zingiberaceae family, has a long history of use in traditional medicine and as been used for a wide array of ailments such as arthritis, diabetes, nausea, and stroke. Several studies have demonstrated anti-emetic, anti-inflammatory, and anti-carcinogenic properties of ginger. When used at high concentrations (μM), two phytochemcials derived from ginger root curcumin and zingerone, have been shown to promote weight loss and modify adipogenic signaling. However, due to the low bioavailability of curcumin the physiological relevance of these findings remains to be determined. The purpose of this study was to determine the extent to which curcumin and zingerone modify adipogenesis in 3T3-L1 fibroblasts. To determine the effects of the bioactive components in varying concentrations, 3T3-L1 preadipocytes were exposed to either 100pM, 100nM, or 100μM of curcumin or zingerone and tested for cell viability, lipid accumulation, and PPARγ activation. The results of this study suggest that high concentrations of curcumin (100 μM) may be toxic to 3T3-L1 fibroblasts in vitro and significantly inhibit both cell viability and lipid accumulation. The resultant low PPARγ activity may be attributable to cell necrosis rather than dose-dependent inhibition, suggesting need for further research into extreme curcumin supplementation. While results for zingerone did not differ significantly from vehicle, the results of this study provide evidence that further research is needed to ascertain to what extent curcumin and zingerone dose-dependently modify PPARγ and TCF/LEF in 3T3-L1 fibroblasts using lower physiologically relevant doses.
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Ballou, Rafik. "Anisotropies magnétiques du cobalt dans les composés intermétalliques lanthanide-cobalt." Grenoble 1, 1987. http://www.theses.fr/1987GRE10114.

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Analyse phénoménologique des processus d'aimantation des composes YCo5 et GDCo5 mettant en évidence une anisotropie des interactions d'échangé Ln-Co liée à l'anisotropie de polarisation des électrons 5d de l'atome Ln. Etude de l'incidence de l'instabilité du magnétisme de bande 3d sur l'anisotropie magnétique dans les phases Ln2Co7 et LnCo3. Etude de l'anisotropie des systèmes à empilement quasi-unidimensionnel LnCo(1-epsilon ). Analyse de la sélection orbitale induite par les intégrales de transfert
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Omar, Abderrahim. "Contribution à l'étude des propriétés électromagnétitques des couches et multicouches supraconductrices à haute Tc : mesure d'impédance de surface par oscillateur à diode tunnel." Grenoble 1, 1993. http://www.theses.fr/1993GRE10168.

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Nous avons concu et realise un systeme de mesure d'impedance de surface z#s de films minces conducteurs ou supraconducteurs par couplage electromagnetique de ces films a un oscillateur a diode tunnel. La mesure de la resistance de films metalliques (or et aluminium) par cette technique inductive (sans contact) nous a permis, en comparant aux mesures directes (4 fils), de valider cette methode. Nous avons ensuite etudie la reponse electromagnetique de films supraconducteurs d'yba#2cu#3o#7 et de multicouches yba#2cu#3o#7/la#2##xsr#xcuo#4. Cette etude a mis en evidence le caractere granulaire de ces materiaux reflete par des valeurs trop elevees de la profondeur de penetration () et la presence d'une resistance residuelle dans la phase supraconductrice. Le comportement de en fonction de la temperature indique que le couplage intergranulaire serait de type sis dans le cas de films et sns dans le cas des multicouches etudiees. Cette difference devrait avoir son origine dans les procedes et conditions de fabrication de ces echantillons
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Schwerdtfeger, Michael. "Elaboration et caractérisation de multicouches supraconductrices YBaCuO/LaSrCuO." Grenoble 1, 1993. http://www.theses.fr/1993GRE10179.

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Ce travail est consacre a l'elaboration et a la caracterisation structurale et electrique de multicouches supraconductrices de type yba#2cu#3o#7#-#/la#2#-#xsr#xcuo#4 (ybco/lasrcuo). Deux dopages differents en strontium ont ete choisis afin de separer les couches d'ybco soit par des couches semi-isolantes de la#2cuo#4 (lco) pour x=0, soit par des couches metalliques de la#1#,#8#5sr#0#,#1#5cuo#4 (lsco) pour x=0,15. Le principal objectif de ce travail est donc d'etudier comment l'intercalation de couches de lasrcuo, de nature et d'epaisseur differentes, affecte la dimensionnalite et l'anisotropie de ces systemes. Les echantillons sont elabores par photo-ablation avec un laser excimere d'une longueur d'onde de 248 nm (krf). Une etude prealable, portant sur les proprietes structurales et electriques de couches minces d'ybco, de lco et de lsco, a permis de constituer une base de reference pour l'etude du comportement des multicouches. Les proprietes structurales et morphologiques ont ete analysees par diffraction de rayons x, par rbs et par microscopie electronique. En particulier les figures de poles x ont revele la rotation des axes a et b des couches de lco de 45 par rapport aux axes des substrats de srtio#3. L'etude de la magnetoresistance et des fluctuations de conductance des couches d'ybco a montre que ce compose est moderement anisotrope et qu'il ne presente pas un comportement purement bidimensionnel. La derniere partie de ce memoire est consacree a l'etude des proprietes des multicouches. Ainsi, la diffraction de rayons x a permis de constater la bonne qualite epitaxiale des echantillons, avec une rotation de 45 des axes a et b des couches de lco par rapport aux axes des substrats et des couches d'ybco. Cette etude a egalement revele la presence probable de contraintes aux interfaces entre les couches d'ybco et les couches de lasrcuo. A partir de l'analyse de la transition resistive, des fluctuations de conductance et de la magnetoresistance, il a ete montre que le decouplage des couches d'ybco par des couches de lasrcuo d'epaisseur croissante resulte en un abaissement de la temperature critique, la suppression du passage d'un regime bidimensionnel a un regime tridimensionnel et une anisotropie accrue
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Books on the topic "L12 Compounds"

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Pelleg, Joshua. Diffusion in the Iron Group L12 and B2 Intermetallic Compounds. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7.

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Deniszczyk, Józef. Struktura elektronowa, właściwości magnetyczne i parametry struktury nadsubtelnej wybranych międzymetalicznych związków żelaza o strukturze typu B2, DO3 i L21. Katowice: Wydawnictwo Uniwersytetu Śląskiego, 2005.

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Pelleg, Joshua. Diffusion in the Iron Group L12 and B2 Intermetallic Compounds. Springer, 2018.

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Pelleg, Joshua. Diffusion in the Iron Group L12 and B2 Intermetallic Compounds. Springer London, Limited, 2016.

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Pelleg, Joshua. Diffusion in the Iron Group L12 and B2 Intermetallic Compounds. Springer, 2016.

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Book chapters on the topic "L12 Compounds"

1

Pelleg, Joshua. "Diffusion Mechanisms in L12 Structures." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 23–28. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_2.

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Mishima, Yoshinao, and Tomoo Suzuki. "Mechanical Properties and Phase Stability of L12 Ni3Al Ternary Compounds." In Alloy Phase Stability, 23–27. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0915-1_3.

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Pope, David P. "Deformation and Fracture of Intermetallic Compounds Having the L12 Crystal Structure." In Ordered Intermetallics — Physical Metallurgy and Mechanical Behaviour, 143–53. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2534-5_11.

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Pelleg, Joshua. "Diffusion Equations and Mechanisms." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 3–20. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_1.

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Pelleg, Joshua. "Diffusion in CoAl." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 295–307. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_10.

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Pelleg, Joshua. "Diffusion in CoGa." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 309–19. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_11.

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Pelleg, Joshua. "Diffusion in FeAl." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 323–55. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_12.

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Pelleg, Joshua. "Diffusion in Ni3Al." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 31–147. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_3.

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Pelleg, Joshua. "Diffusion in Ni3Ga." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 149–64. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_4.

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Pelleg, Joshua. "Diffusion in Ni3Ge." In Diffusion in the Iron Group L12 and B2 Intermetallic Compounds, 165–78. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39522-7_5.

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Conference papers on the topic "L12 Compounds"

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Desta, Okbamichael, and Yu Timoshenko. "THE GEOMETRY OPTIMIZATION CALCULATIONS ON MECHANICAL PROPERTIES OF L12 STRUCTURE AL3X AND ALX3-TYPE (X = AU, AG, CU) INTERMETALLIC COMPOUNDS." In PHYSICAL BASIS OF MODERN SCIENCE-INTENSIVE TECHNOLOGIES. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2022. http://dx.doi.org/10.34220/pfmsit2022_27-34.

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In this work, computer simulation of mechanical properties such as elastic constants and moduli as well as intrinsic hardness of Al , Al3X and AlX3 having crystal lattice structure of the type L12 is presented. To describe the energy of interaction in metals and alloys, the Sutton-Chen semi-empirical inter-atomic potential was utilized. The simulation was run using the geometry optimization method with the General Utility Lattice Program (GULP) 5.1. From the six different alloys studied, the alloy with highest intrinsic hardness isAlAg3 while with the lowest value for CuAl3. The findings show that Al -based alloys have values of mechanical characteristics that are higher than the pure aluminium metal. The values of mechanical characteristics of the alloys are indirectly proportional to the percentage of aluminium in a given alloy system. The work further confirms that the percentage of aluminium in the alloy systems have significant impact on the mechanical properties.
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Wang, H., P. Li, Q. Guo, and H. Yang. "Study of Microstructure and Atomization Forming Process of Ultrasonic Arc Sprayed TiAI Alloy Coatings." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0639.

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Abstract By means of homemade ultrasonic arc spraying equipment patented, under the condition of the optimum arc spraying parameters, TiAl alloy coatings were manufactured on the aluminum alloy (LY12) matrix surface. The ultrasonic arc spraying forming process and microstructure of TiAl compounds alloy coatings were investigated by the color metallurgical microscopy, SEM, XRD, EPMA and chemical composition quantitative analysis (ICP). The results showed that TiAl compounds composite coatings can be synthesized by ultrasonic arc spraying system, the coatings possess typical lamella character, consist of TiN (or TiO), TiAl, Ti0.7.1.1 Al(N,O), Ti2.4Al(N,O), Ti2.4Al and aluminum alloy solid solution.
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Kahlon, K. S., A. S. Dhaliwal, Baltej Singh Sidhu, and Manoj Kumar Gupta. "Calculated values of jump factor and jump ratios of lanthanum compounds in K shell and L1, L2 and L3 subshells." In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2020): 5th National e-Conference on Advanced Materials and Radiation Physics. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0053046.

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Schruter, M., A. Pawlak, A. Mukherjee, D. Celi, and M. Krattenmacher. "HICUM/L2: Extensions over the last decade." In 2020 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium (BCICTS). IEEE, 2020. http://dx.doi.org/10.1109/bcicts48439.2020.9392954.

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Ionescu, Daniela, and Maria Kovaci. "Performances of the racetrack memories of high density based on intermetallic compounds with high anisotropy in L10 phase." In 2016 12th IEEE International Symposium on Electronics and Telecommunications (ISETC). IEEE, 2016. http://dx.doi.org/10.1109/isetc.2016.7781071.

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Mazur, Zdzislaw, Rafael Garci´a-Illescas, Jorge Aguirre-Romano, and Norberto Pe´rez-Rodri´guez. "Last-Stage Blade Failure Evaluation." In ASME 2007 Power Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/power2007-22010.

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A last stage turbine blades failure was experienced in two units of 660 MW. These units have one high-pressure turbine and two tandem-compound low-pressure turbines with 44-inch last-stage blades. The blades that failed were in a low pressure (LP) turbine connected to the high pressure (HP) turbine (LP1) and in LP turbine connected to the generator (LP2). The failed blades had cracks in their roots initiating at the trailing edge, concave side of the steeple outermost fillet radius. Laboratory evaluation of the cracking indicates the failure mechanism to be high cycle fatigue (HCF). The last-stage blades failure evaluation was carried out. The investigation included a metallographic analysis of the cracked blades, natural frequency test and analysis, blade stress analysis, unit’s operation parameters and history of events analysis, fracture mechanics and crack propagation analysis. This paper provides an overview of this failure investigation, which led to the identification of the blades torsional vibrations near 120 Hz and some operation periods with low load low vacuum as the primary contribution to the observed failure.
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Šeklić, Dragana, Milena Jovanović, Nevena Milivojević, and Marko Živanović. "PLATINUM(IV) COMPLEX AND ITS CORRESPONDING LIGAND SUPPRESS CELL MOTILITY AND PROMOTE EXPRESSION OF FRIZZLED-7 RECEPTOR IN COLORECTAL CANCER CELLS." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.288s.

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Suppression of cell movement is an imperative in the effectiveness of future generations of chemotherapeutics. Frizzled 7 receptor (FZD7), as the first protein of Wnt/β-catenin signaling cascade, plays a significant role in regulation of cell differentiation, proliferation, and cell migration. This study aimed to investigate the potential effects of platinum (IV) complex: [PtCl4 (dbu-S, S-eddp)] – C1, and its corresponding ligand – L1 on cell movement, as well as the FZD7 expression and localization after treatments on two human colorectal carcinoma cell lines (HCT-116, SW-480). A Wound healing assay was used to examine cell migration, while FZD7 protein expression was examined by immunofluorescence. Chemical compounds, especially L1, reduced cell motility of both tested cell lines. They showed a particularly good effect on HCT-116 cells, increasing protein expression of the antimigratory marker FZD7 whose localization was observed on the cell membrane of HCT-116 cells. Suppression of cell movement was significantly lower in SW-480 cells after treatments, when compared to HCT-116, with an obvious decrease of FZD7 receptor expression and its localization in the cytoplasm of these cells. Our results indicate that among the examined treatments, the ligand showed more significant results in the suppression of HCT-116 cell movement, most likely through the stimulation of differentiation, which is indicated by the promotion of FZD7 expression.
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Ligrani, Phillip M., and Stephen W. Mitchell. "Effects of Embedded Vortices on Injectant From Film Cooling Holes With Large Spanwise Spacing and Compound Angle Orientations in a Turbulent Boundary Layer." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-211.

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Experimental results are presented which describe the effects of embedded, longitudinal vortices on heat transfer and film injectant downstream of a single row of film cooling holes with compound angle orientations. Holes are spaced 7.8 hole diameters apart in the spanwise direction so that information is obtained on the interactions between the vortices and the injectant from a single hole. The compound angle holes are oriented so that their angles with respect to the test surface are 30 degrees in a spanwise/normal plane projection, and 35 degrees in a streamwise/normal plane projection. A blowing ratio of 0.5 is employed and the ratio of vortex core diameter to hole diameter is 1.6–1.67 just downstream of the injection holes (x/d=10.2). At the same location, vortex circulation magnitudes range from 0.15 m2/s to 0.18 m2/s. The most important conclusion is that local heat transfer and injectant distributions are strongly affected by the longitudinal embedded vortices, including their directions of rotation and their spanwise positions with respect to film injection holes. To obtain information on the latter, clockwise rotating vortices R0-R4 and counter-clockwise rotating vortices L0-L4 are placed at different spanwise locations with respect to the central injection hole located on the spanwise centerline. With vortices R0-R4, the greatest disruption to the film is produced by the vortex whose downwash passes over the central hole (R0). With vortices L0-L4, the greatest disruption is produced by the vortices whose cores pass over the central hole (L1 and L2). To minimize such disruptions, vortex centers must pass at least 1.5 vortex core diameters away from an injection hole on the upwash sides of the vortices and 2.9 vortex core diameters away on the downwash sides of the vortices. Differences resulting from vortex rotation are due to secondary flow vectors, especially beneath vortex cores, which are in different directions with respect to the spanwise velocity components of injectant after it exits the holes. When secondary flow vectors near the wail are in the same direction as the spanwise components of the injectant velocity (vortices R0-R4), the film injectant is more readily swept beneath vortex cores and into vortex upwash regions than for the opposite situation in which near-wall secondary flow vectors are opposite to the spanwise components of the injectant velocity (vortices L0-L4). Consequently, higher Stanton numbers are generally present over larger portions of the test surface with vortices R0-R4 than with vortices L0-L4.
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Lefevre, Lauriane, Antoine Dazin, Jerome Delva, and Vianney Nowinski. "Experimental Evaluation of the Aerodynamic Rotor/Propeller Interactions on High Speed Helicopters, Efforts and Velocity Fields Measurements." In Vertical Flight Society 78th Annual Forum & Technology Display. The Vertical Flight Society, 2022. http://dx.doi.org/10.4050/f-0078-2022-17458.

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This paper focuses on the experimental evaluation of the rotor/propeller interactions for hybrid compound configurations. Experiments are conducted in the ONERA L2 large size-low speed wind tunnel with a 1/7.7 Dauphin 365N model and a four-bladed small-scale propeller. Measurements are realized using two six-component balances, accelerometers, and blade pitch, flap and lead-lag angle sensors. PIV measurements are performed to visualize the velocity fields around the helicopter. Different flight conditions (wind speeds and propeller rotational speeds) have been tested. The comparison of the results obtained with an isolated main rotor and an isolated propeller with the complete assembly highlighted the influence of their interactions on their performances. In hover, the propeller is completely immersed in the rotor wake, and the thrust is therefore maximal. At low speed, the propeller is partially immersed and the flow on the propeller disk is highly asymmetrical. No direct interactions are measured at high speed, where the interactions increase the performances of the propeller due to the increased angle of attack of the flow on the propeller disk.
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Morales-Kastresana, Aizea, Marina Pavlidou, Janet Peper, Lucia Pattarini, Christian Barthels, Eva-Maria Hansbauer, Rachida Bel Aiba, et al. "Abstract LB135: Simultaneous costimulatory T-cell engagement and checkpoint inhibition by PRS-344/S095012, a PD-L1/4-1BB bispecific compound for tumor localized activation of the immune system." In Proceedings: AACR Annual Meeting 2021; April 10-15, 2021 and May 17-21, 2021; Philadelphia, PA. American Association for Cancer Research, 2021. http://dx.doi.org/10.1158/1538-7445.am2021-lb135.

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Reports on the topic "L12 Compounds"

1

Blumwald, Eduardo, and Avi Sadka. Citric acid metabolism and mobilization in citrus fruit. United States Department of Agriculture, October 2007. http://dx.doi.org/10.32747/2007.7587732.bard.

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Accumulation of citric acid is a major determinant of maturity and fruit quality in citrus. Many citrus varieties accumulate citric acid in concentrations that exceed market desires, reducing grower income and consumer satisfaction. Citrate is accumulated in the vacuole of the juice sac cell, a process that requires both metabolic changes and transport across cellular membranes, in particular, the mitochondrial and the vacuolar (tonoplast) membranes. Although the accumulation of citrate in the vacuoles of juice cells has been clearly demonstrated, the mechanisms for vacuolar citrate homeostasis and the components controlling citrate metabolism and transport are still unknown. Previous results in the PIs’ laboratories have indicated that the expression of a large number of a large number of proteins is enhanced during fruit development, and that the regulation of sugar and acid content in fruits is correlated with the differential expression of a large number of proteins that could play significant roles in fruit acid accumulation and/or regulation of acid content. The objectives of this proposal are: i) the characterization of transporters that mediate the transport of citrate and determine their role in uptake/retrieval in juice sac cells; ii) the study of citric acid metabolism, in particular the effect of arsenical compounds affecting citric acid levels and mobilization; and iii) the development of a citrus fruit proteomics platform to identify and characterize key processes associated with fruit development in general and sugar and acid accumulation in particular. The understanding of the cellular processes that determine the citrate content in citrus fruits will contribute to the development of tools aimed at the enhancement of citrus fruit quality. Our efforts resulted in the identification, cloning and characterization of CsCit1 (Citrus sinensis citrate transporter 1) from Navel oranges (Citrus sinesins cv Washington). Higher levels of CsCit1 transcripts were detected at later stages of fruit development that coincided with the decrease in the juice cell citrate concentrations (Shimada et al., 2006). Our functional analysis revealed that CsCit1 mediates the vacuolar efflux of citrate and that the CsCit1 operates as an electroneutral 1CitrateH2-/2H+ symporter. Our results supported the notion that it is the low permeable citrateH2 - the anion that establishes the buffer capacity of the fruit and determines its overall acidity. On the other hand, it is the more permeable form, CitrateH2-, which is being exported into the cytosol during maturation and controls the citrate catabolism in the juice cells. Our Mass-Spectrometry-based proteomics efforts (using MALDI-TOF-TOF and LC2- MS-MS) identified a large number of fruit juice sac cell proteins and established comparisons of protein synthesis patterns during fruit development. So far, we have identified over 1,500 fruit specific proteins that play roles in sugar metabolism, citric acid cycle, signaling, transport, processing, etc., and organized these proteins into 84 known biosynthetic pathways (Katz et al. 2007). This data is now being integrated in a public database and will serve as a valuable tool for the scientific community in general and fruit scientists in particular. Using molecular, biochemical and physiological approaches we have identified factors affecting the activity of aconitase, which catalyze the first step of citrate catabolism (Shlizerman et al., 2007). Iron limitation specifically reduced the activity of the cytosolic, but not the mitochondrial, aconitase, increasing the acid level in the fruit. Citramalate (a natural compound in the juice) also inhibits the activity of aconitase, and it plays a major role in acid accumulation during the first half of fruit development. On the other hand, arsenite induced increased levels of aconitase, decreasing fruit acidity. We have initiated studies aimed at the identification of the citramalate biosynthetic pathway and the role(s) of isopropylmalate synthase in this pathway. These studies, especially those involved aconitase inhibition by citramalate, are aimed at the development of tools to control fruit acidity, particularly in those cases where acid level declines below the desired threshold. Our work has significant implications both scientifically and practically and is directly aimed at the improvement of fruit quality through the improvement of existing pre- and post-harvest fruit treatments.
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