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Journal articles on the topic 'El Laco'

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Published: 10 December 2022

Last updated: 28 January 2023

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1

Forde, Gareth M., Siddhartha Ghose, Nigel K. H. Slater, Anna V. Hine, Richard A. J. Darby, and Anthony G. Hitchcock. "LacO-LacI interaction in affinity adsorption of plasmid DNA." Biotechnology and Bioengineering 95, no. 1 (2006): 67–75. http://dx.doi.org/10.1002/bit.20955.

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2

Nicolas, Emilien, Michaël Lambin, and Bernard Hallet. "Target Immunity of the Tn3-Family Transposon Tn4430 Requires Specific Interactions between the Transposase and the Terminal Inverted Repeats of the Transposon." Journal of Bacteriology 192, no. 16 (June 4, 2010): 4233–38. http://dx.doi.org/10.1128/jb.00477-10.

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ABSTRACT Specificity of the Tn4430 target immunity signal was examined by fusing the transposase TnpA to the LacI repressor of Escherichia coli. The resulting chimeric proteins failed to impose immunity to DNA targets carrying copies of the lacO operator, though they were proficient in lacO binding in vivo and remained responsive to wild-type immunity conferred by the Tn4430 inverted repeat end. Intriguingly, the presence of lacO repeats within the target was found to strongly influence target site selection by Tn4430, but in a LacI-independent manner.

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3

Bharatan, Shanti M., Manjula Reddy, and J. Gowrishankar. "Distinct Signatures for Mutator Sensitivity of lacZ Reversions and for the Spectrum of lacI/lacO Forward Mutations on the Chromosome of Nondividing Escherichia coli." Genetics 166, no. 2 (February 1, 2004): 681–92. http://dx.doi.org/10.1093/genetics/166.2.681.

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Abstract A conditional lethal galE(Ts)-based strategy was employed in Escherichia coli, first to eliminate all growth-associated chromosomal reversions in lacZ or forward mutations in lacI/lacO by incubation at the restrictive temperature and subsequently to recover (as papillae) spontaneous mutations that had arisen in the population of nondividing cells after shift to the permissive temperature. Data from lacZ reversion studies in mutator strains indicated that the products of all genes for mismatch repair (mutHLS, dam, uvrD), of some for oxidative damage repair (mutMT), and of that for polymerase proofreading (dnaQ) are required in dividing cells; some others for oxidative damage repair (mutY, nth nei) are required in both dividing and nondividing cells; and those for alkylation damage repair (ada ogt) are required in nondividing cells. The spectrum of lacI/lacO mutations in nondividing cells was distinguished both by lower frequencies of deletions and IS1 insertions and by the unique occurrence of GC-to-AT transitions at lacO +5. In the second approach to study mutations that had occurred in nondividing cells, lacI/lacO mutants were selected as late-arising papillae from the lawn of a galE+ strain; once again, transitions at lacO +5 were detected among the mutants that had been obtained from populations initially grown on poor carbon sources such as acetate, palmitate, or succinate. Our results indicate that the lacO +5 site is mutable only in nondividing cells, one possible mechanism for which might be that random endogenous alkylation (or oxidative) damage to DNA in these cells is efficiently corrected by the Ada Ogt (or Nth Nei) repair enzymes at most sites but not at lacO +5. Furthermore, the late-arising papillae from the second approach were composed almost exclusively of dominant lacI/lacO mutants. This finding lends support to “instantaneous gratification” models in which a spontaneous lesion, occurring at a random site in DNA of a nondividing cell, is most likely to be fixed as a mutation if it allows the cell to immediately exit the nondividing state.

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4

Yabuki, Munehisa, W. Jason Cummings, John B. Leppard, Robert M. Immormino, Christi L. Wood, Daniel S. Allison, Patrick W. Gray, Larry W. Tjoelker, and Nancy Maizels. "Antibody Discovery Ex Vivo Accelerated by the LacO/LacI Regulatory Network." PLoS ONE 7, no. 4 (April 27, 2012): e36032. http://dx.doi.org/10.1371/journal.pone.0036032.

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5

Ding, Da-Qiao, and Yasushi Hiraoka. "Visualization of a Specific Genome Locus by the lacO/LacI-GFP System." Cold Spring Harbor Protocols 2017, no. 10 (July 21, 2017): pdb.prot091934. http://dx.doi.org/10.1101/pdb.prot091934.

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6

See, L., C. Perger, M. Hofer, J. Weichselbaum, C. Dresel, and S. Fritz. "LACO-WIKI: AN OPEN ACCESS ONLINE PORTAL FOR LAND COVER VALIDATION." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3/W5 (August 19, 2015): 167–71. http://dx.doi.org/10.5194/isprsannals-ii-3-w5-167-2015.

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The LACO-Wiki tool represents an open access, online portal that offers standardized land cover validation at local to global scales. LACO-Wiki integrates the LACOVAL prototype for land cover validation and the Geo-Wiki system for visualization, validation and crowdsourcing of land cover. This paper presents a conceptual overview of the LACO-Wiki system and describes the main validation workflow, in which the user uploads the map for validation, creates a validation sample, carries out the sample interpretation and generates a report detailing the accuracy assessment. In addition to a land cover validation tool, LACO-Wiki is also intended to become an open access repository for calibration and validation data that can be used by the land monitoring community to improve future land cover products.

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7

Du, Manyu, Seth Kodner, and Lu Bai. "Enhancement of LacI binding in vivo." Nucleic Acids Research 47, no. 18 (August 9, 2019): 9609–18. http://dx.doi.org/10.1093/nar/gkz698.

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Abstract Transcription factors (TFs) bind to specific sequences in DNA to regulate transcription. Despite extensive measurements of TFs’ dissociation constant (Kd) in vitro, their apparent Kdin vivo are usually unknown. LacI, a bacterial TF, is often used to artificially recruit proteins onto eukaryotic genomes. As LacI binds tightly to its recognition site (LacO) in vitro with a Kd about 10 picomolar (pM), it is often assumed that LacI also has high affinity to LacO in vivo. In this work, we measured LacI binding in living yeast cells using a fluorescent repressor operator system and found an apparent Kd of ∼0.6 μM, four orders of magnitude higher than that in vitro. By genetically altering (i) GFP-LacI structure, (ii) GFP-LacI stability, (iii) chromosome accessibility and (iv) LacO sequence, we reduced the apparent Kd to <10 nM. It turns out that the GFP tagging location and the fusion protein stability have a large effect on LacI binding, but surprisingly, chromosome accessibility only plays a mild role. These findings contribute to our quantitative understanding of the features that affect the apparent Kd of TF in cells. They also provide guidance for future design of more specific chromosomal recruitment through high-affinity TFs.

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8

Asti, G., F. Bolzoni, J. M. Le Breton, M. Ghidini, A. Morel, M. Solzi, F. Kools, and P. Tenaud. "Magnetic anisotropy of LaCo-substituted SrFe12O19 ferrites." Journal of Magnetism and Magnetic Materials 272-276 (May 2004): E1845—E1846. http://dx.doi.org/10.1016/j.jmmm.2003.12.1275.

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9

Henríquez, Fernando, and Jan Olov Nyström. "Magnetite bombs at El Laco volcano, Chile." GFF 120, no. 3 (September 1998): 269–71. http://dx.doi.org/10.1080/11035899809453216.

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10

Li, Siqiao, Tiantian Zhang, Yaojun Qiao, and Ji Zhou. "Dimming control scheme based on hybrid LACO-SCFDM for visible light communications." Chinese Optics Letters 19, no. 4 (2021): 040601. http://dx.doi.org/10.3788/col202119.040601.

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11

Wang, Guangtao, Minping Zhang, Zhen Li, and Zongxian Yang. "The electronic structure of LaCo 2 B 2." EPL (Europhysics Letters) 95, no. 1 (June 7, 2011): 17001. http://dx.doi.org/10.1209/0295-5075/95/17001.

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12

La Cruz, Nikita L., J. Tomás Ovalle, Adam C. Simon, Brian A. Konecke, Fernando Barra, Martin Reich, Mathieu Leisen, and Tristan M. Childress. "The Geochemistry of Magnetite and Apatite from the El Laco Iron Oxide-Apatite Deposit, Chile: Implications for Ore Genesis." Economic Geology 115, no. 7 (November 1, 2020): 1461–91. http://dx.doi.org/10.5382/econgeo.4753.

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Abstract The textures of outcrop and near-surface exposures of the massive magnetite orebodies (>90 vol % magnetite) at the Plio-Pleistocene El Laco iron oxide-apatite (IOA) deposit in northern Chile are similar to basaltic lava flows and have compositions that overlap high- and low-temperature hydrothermal magnetite. Existing models—liquid immiscibility and complete metasomatic replacement of andesitic lava flows—attempt to explain the genesis of the orebodies by entirely igneous or entirely hydrothermal processes. Importantly, those models were developed by studying only near-surface and outcrop samples. Here, we present the results of a comprehensive study of samples from outcrop and drill core that require a new model for the evolution of the El Laco ore deposit. Backscattered electron (BSE) imaging, electron probe microanalysis (EPMA), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were used to investigate the textural and compositional variability of magnetite and apatite from surface and drill core samples in order to obtain a holistic understanding of textures and compositions laterally and vertically through the orebodies. Magnetite was analyzed from 39 surface samples from five orebodies (Cristales Grandes, Rodados Negros, San Vicente Alto, Laco Norte, and Laco Sur) and 47 drill core samples from three orebodies (Laco Norte, Laco Sur, and Extensión Laco Sur). The geochemistry of apatite from eight surface samples from three orebodies (Cristales Grandes, Rodados Negros, and Laco Sur) was investigated. Minor and trace element compositions of magnetite in these samples are similar to magnetite from igneous rocks and magmatic-hydrothermal systems. Magnetite grains from deeper zones of the orebodies contain >1 wt % titanium, as well as ilmenite oxyexsolution lamellae and interstitial ilmenite. The ilmenite oxyexsolution lamellae, interstitial ilmenite, and igneous-like trace element concentrations in titanomagnetite from the deeper parts of the orebodies are consistent with original crystallization of titanomagnetite from silicate melt or high-temperature magmatic-hydrothermal fluid. The systematic decrease of trace element concentrations in magnetite from intermediate to shallow depths is consistent with progressive growth of magnetite from a cooling magmatic-hydrothermal fluid. Apatite grains from surface outcrops are F rich (typically >3 wt %) and have compositions that overlap igneous and magmatic-hydrothermal apatite. Magnetite and fluorapatite grains contain mineral inclusions (e.g., monazite and thorite) that evince syn- or postmineralization metasomatic alteration. Magnetite grains commonly meet at triple junctions, which preserve evidence for reequilibration of the ore minerals with hydrothermal fluid during or after mineralization. The data presented here are consistent with genesis of the El Laco orebodies via shallow emplacement and eruption of magnetite-bearing magmatic-hydrothermal fluid suspensions that were mobilized by decompression-induced collapse of the volcanic edifice. The ore-forming magnetite-fluid suspension would have rheological properties similar to basaltic lava flows, which explains the textures and presence of cavities and gas escape tubes in surface outcrops.

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13

Swerdlow, Sarah J., and Roel M. Schaaper. "Mutagenesis in the lacI gene target of E. coli: Improved analysis for lacId and lacO mutants." Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 770 (December 2014): 79–84. http://dx.doi.org/10.1016/j.mrfmmm.2014.09.004.

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14

Liu Xiaoshuang, 刘晓爽, 李建锋 Li Jianfeng, 任亚浩 Ren Yahao, and 黄治同 Huang Zhitong. "无线光通信中LACO-OFDM的非迭代检测接收方法." Chinese Journal of Lasers 49, no. 11 (2022): 1106002. http://dx.doi.org/10.3788/cjl202249.1106002.

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15

Xiao-hua, Yan, and Liang Jing-kui. "Structure and magnetic properties of LaCo 13 -based alloys." Acta Physica Sinica (Overseas Edition) 3, no. 4 (April 1994): 297–302. http://dx.doi.org/10.1088/1004-423x/3/4/007.

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16

Wang, Caiyun, Lirong Zeng, Wei Guo, Cairong Gong, and Jing Yang. "Enhancing oxygen and hydrogen evolution activities of perovskite oxide LaCoO3via effective doping of platinum." RSC Advances 9, no. 61 (2019): 35646–54. http://dx.doi.org/10.1039/c9ra05491j.

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Among the perovskite LaCo_1−xPt_xO_3−δ catalysts, LaCo_0.94Pt_0.06O_3−δ proved best for catalyzing OER/HER, with η = 454/294 mV, which might be attributed to LCP6 having the e_g orbital filling of Co closest to 1.2.

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17

Bain, Wyatt M., Matthew Steele-MacInnis, Fernando Tornos, John M. Hanchar, Emily C. Creaser, and Dorota K. Pietruszka. "Evidence for iron-rich sulfate melt during magnetite(-apatite) mineralization at El Laco, Chile." Geology 49, no. 9 (May 17, 2021): 1044–48. http://dx.doi.org/10.1130/g48861.1.

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Abstract The origins of Kiruna-type magnetite(-apatite) [Mt(-Ap)] deposits are contentious, with existing models ranging from purely hydrothermal to orthomagmatic end members. Here, we evaluate the compositions of fluids that formed the classic yet enigmatic Mt(-Ap) deposit at El Laco, northern Chile. We report evidence that ore-stage minerals crystallized from an Fe-rich (6–17 wt% Fe) sulfate melt. We suggest that a major component of the liquid was derived from assimilation of evaporite-bearing sedimentary rocks during emplacement of andesitic magma at depth. Hence, we argue that assimilation of evaporite-bearing sedimentary strata played a key role in the formation of El Laco and likely Mt(-Ap) deposits elsewhere.

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18

Guo, Dongwei, Yanhe Li, Chao Duan, and Changfu Fan. "Involvement of Evaporite Layers in the Formation of Iron Oxide-Apatite Ore Deposits: Examples from the Luohe Deposit in China and the El Laco Deposit in Chile." Minerals 12, no. 8 (August 19, 2022): 1043. http://dx.doi.org/10.3390/min12081043.

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Iron oxide-apatite (IOA) deposits are important sources of iron. The role of evaporite layers in the formation of IOA ore deposits remains controversial. The Luohe deposit in eastern China and the El Laco deposit in Chile are representative IOA deposits. In this study, the S isotope characteristics of these two deposits are revisited. The formation of the Luohe ore deposit is closely related to marine evaporite layers in the Middle Triassic Dongma’anshan Formation. At Luohe, most of the sulfides and sulfates have high δ34SV-CDT values (concentrated from 6‰ to 10‰ and 16‰ to 20‰, respectively). The δ34SV-CDT values of sulfates are similar to those of marine evaporite layers (28–30‰) in the Dongma’anshan Formation. Estimates show that 46–82% of sulfur in the Luohe deposit is derived from marine evaporite layers. Unlike the Luohe deposit, the El Laco ore deposit formed in close relation to terrestrial evaporite layers from the Cretaceous-Tertiary Salta Group. At El Laco, the sulfides and sulfates have lower δ34SV-CDT values of −2.3‰ to −0.9‰ and 6.8‰ to 10.5‰, respectively. The δ34SV-CDT values of sulfates from the El Laco deposit are similar to those of sulfates from terrestrial evaporite layers (9.5‰) in the Salta Group. Estimates reveal that more than 70% of sulfur comes from terrestrial evaporite layers. These results indicate that evaporite layers have been involved in IOA ore-forming systems of both hydrothermal and magmatic deposits. Evaporite layers are proposed to have played key roles in the ore-forming processes of the Luohe and the Laco deposits and in other IOA deposits elsewhere.

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19

Childress, Tristan, Adam C. Simon, Martin Reich, Fernando Barra, Laura D. Bilenker, Nikita L. La Cruz, Ilya N. Bindeman, and J. Tomás Ovalle. "Triple Oxygen (δ18O, Δ17O), Hydrogen (δ2H), and Iron (δ56Fe) Stable Isotope Signatures Indicate a Silicate Magma Source and Magmatic-Hydrothermal Genesis for Magnetite Orebodies at El Laco, Chile." Economic Geology 115, no. 7 (November 1, 2020): 1519–36. http://dx.doi.org/10.5382/econgeo.4760.

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Abstract The Plio-Pleistocene El Laco iron oxide-apatite (IOA) orebodies in northern Chile are some of the most enigmatic mineral deposits on Earth, interpreted to have formed as lava flows or by hydrothermal replacement, two radically different processes. Field observations provide some support for both processes, but ultimately fail to explain all observations. Previously proposed genetic models based on observations and study of outcrop samples include (1) magnetite crystallization from an erupting immiscible Fe- and P-rich (Si-poor) melt and (2) metasomatic replacement of andesitic lava flows by a hypogene hydrothermal fluid. A more recent investigation of outcrop and drill core samples at El Laco generated data that were used to develop a new genetic model that invokes shallow emplacement and surface venting of a magnetite-bearing magmatic-hydrothermal fluid suspension. This fluid, with rheological properties similar to basaltic lava, would have been mobilized by decompression-induced collapse of the volcanic edifice. In this study, we report oxygen, including 17O, hydrogen, and iron stable isotope ratios in magnetite and bulk iron oxide (magnetite with minor secondary hematite and minor goethite) from five of seven orebodies around the El Laco volcano, excluding San Vicente Bajo and the minor Laquito deposits. Calculated values of δ18O, Δ17O, δD, and δ56Fe fingerprint the source of the ore-forming fluid(s): Δ17Osample = δ17Osample – δ18Osample * 0.5305. Magnetite and bulk iron oxide (magnetite variably altered to goethite and hematite) from Laco Sur, Cristales Grandes, and San Vicente Alto yield δ18O values that range from 4.3 to 4.5‰ (n = 5), 3.0 to 3.9‰ (n = 5), and –8.5 to –0.5‰ (n = 5), respectively. Magnetite samples from Rodados Negros are the least altered samples and were also analyzed for 17O as well as conventional 16O and 18O, yielding calculated δ18O values that range from 2.6 to 3.8‰ (n = 9) and Δ17O values that range from –0.13 to –0.07‰ (n = 5). Bulk iron oxide from Laco Norte yielded δ18O values that range from –10.2 to +4.5‰ (avg = 0.8‰, n = 18). The δ2H values of magnetite and bulk iron oxide from all five orebodies range from –192.8 to –79.9‰ (n = 28); hydrogen is present in fluid inclusions in magnetite and iron oxide, and in minor goethite. Values of δ56Fe for magnetite and bulk iron oxide from all five orebodies range from 0.04 to 0.70‰ (avg = 0.29‰, σ = 0.15‰, n = 26). The iron and oxygen isotope data are consistent with a silicate magma source for iron and oxygen in magnetite from all sampled El Laco orebodies. Oxygen (δ18O Δ +4.4 to –10.2‰) and hydrogen (δ2H ≃ –79.9 to –192.8‰) stable isotope data for bulk iron oxide samples that contain minor goethite from Laco Norte and San Vicente Alto reveal that magnetite has been variably altered to meteoric values, consistent with goethite in equilibrium with local δ18O and δ2H meteoric values of ≃ –15.4 and –211‰, respectively. The H2O contents of iron oxide samples from Laco Norte and San Vicente Alto systematically increase with increasing abundance of goethite and decreasing values of δ18O and δ2H. The values of δ2H (≃ –88 to –140‰) and δ18O (3.0–4.5‰) for magnetite samples from Cristales Grandes, Laco Sur, and Rodados Negros are consistent with growth of magnetite from a degassing silicate melt and/or a boiling magmatic-hydrothermal fluid; the latter is also consistent with δ18O values for quartz, and salinities and homogenization temperatures for fluid inclusions trapped in apatite and clinopyroxene coeval with magnetite. The sum of the data unequivocally fingerprint a silicate magma as the source of the ore fluids responsible for mineralization at El Laco and are consistent with a model that explains mineralization as the synergistic result of common magmatic and magmatic-hydrothermal processes during the evolution of a caldera-related explosive volcanic system.

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20

Essalih, Taha, Mohammad Ali Khalighi, Steve Hranilovic, and Hassan Akhouayri. "Optical OFDM for SiPM-Based Underwater Optical Wireless Communication Links." Sensors 20, no. 21 (October 24, 2020): 6057. http://dx.doi.org/10.3390/s20216057.

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Underwater optical wireless systems have dual requirements of high data rates and long ranges in harsh scattering and attenuation conditions. In this paper, we investigate the advantages and limitations of optical orthogonal frequency-division multiplexing (O-OFDM) signaling when a silicon photo-multiplier (SiPM) is used at the receiver in order to ensure high sensitivity. Considering a light-emitting diode (LED) transmitter and taking into account the limited dynamic range imposed by the transmitter and the SiPM receiver, we study the performance of three popular O-OFDM schemes, i.e., DC-biased, asymmetrically-clipped, and layered asymmetrically-clipped O-OFDM (DCO-, ACO-, and LACO-OFDM, respectively). We consider a constraint on transmit electrical power PTxe and take into account the required DC bias for the three considered schemes in practice, showing the undeniable advantage of ACO- and LACO-OFDM in terms of energy efficiency. For instance, for the considered SiPM and LED components, a spectral efficiency of ∼1 bps/Hz with a data rate of 20 Mbps, a link range of 70 m, and a target bit-error-rate (BER) of 10−3, ACO and LACO allow a reduction of about 10 and 6 mW, respectively, in the required PTxe, compared to DCO-OFDM. Meanwhile, we show that when relaxing the PTxe constraint, DCO-OFDM offers the largest operational link range within which a target BER can be achieved. For instance, for a target BER of 10−3 and a data rate of 20 Mbps, and considering PTxe of 185, 80, and 50 mW for DCO-, LACO-, and ACO-OFDM, respectively, the corresponding intervals of operational link range are about 81, 74.3, and 73.8 m. Lastly, we show that LACO-OFDM makes a good compromise between energy efficiency and operational range flexibility, although requiring a higher computational complexity and imposing a longer latency at the receiver.

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21

KREBS, CHRISTOPHER. "LEONIDES LACO QUIDEM SIMILE APUD THERMOPYLAS FECIT: CATO AND HERODOTUS." Bulletin of the Institute of Classical Studies 49, no. 1 (December 1, 2006): 93–103. http://dx.doi.org/10.1111/j.2041-5370.2006.tb00679.x.

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22

Wang, Rongrong, Hanfeng Liang, Jinqing Hong, and Zhoucheng Wang. "Layer-tunable LaCO 3 OH microstructures and their photoluminescence property." Materials Letters 175 (July 2016): 184–87. http://dx.doi.org/10.1016/j.matlet.2016.04.025.

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23

Nyström, Jan Olov, Fernando Henríquez, José A. Naranjo, and H. Richard Naslund. "Magnetite spherules in pyroclastic iron ore at El Laco, Chile." American Mineralogist 101, no. 3 (March 2016): 587–95. http://dx.doi.org/10.2138/am-2016-5505.

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24

Yang, Fang, Yaqi Sun, and Junnan Gao. "Adaptive LACO-OFDM With Variable Layer for Visible Light Communication." IEEE Photonics Journal 9, no. 6 (December 2017): 1–8. http://dx.doi.org/10.1109/jphot.2017.2768435.

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25

Hyppa, Randy W., Joshua D. Cho, Mridula Nambiar, and Gerald R. Smith. "Redirecting meiotic DNA break hotspot determinant proteins alters localized spatial control of DNA break formation and repair." Nucleic Acids Research 50, no. 2 (December 30, 2021): 899–914. http://dx.doi.org/10.1093/nar/gkab1253.

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Abstract During meiosis, DNA double-strand breaks (DSBs) are formed at high frequency at special chromosomal sites, called DSB hotspots, to generate crossovers that aid proper chromosome segregation. Multiple chromosomal features affect hotspot formation. In the fission yeast S. pombe the linear element proteins Rec25, Rec27 and Mug20 are hotspot determinants – they bind hotspots with high specificity and are necessary for nearly all DSBs at hotspots. To assess whether they are also sufficient for hotspot determination, we localized each linear element protein to a novel chromosomal site (ade6 with lacO substitutions) by fusion to the Escherichia coli LacI repressor. The Mug20-LacI plus lacO combination, but not the two separate lac elements, produced a strong ade6 DSB hotspot, comparable to strong endogenous DSB hotspots. This hotspot had unexpectedly low ade6 recombinant frequency and negligible DSB hotspot competition, although like endogenous hotspots it manifested DSB interference. We infer that linear element proteins must be properly placed by endogenous functions to impose hotspot competition and proper partner choice for DSB repair. Our results support and expand our previously proposed DSB hotspot-clustering model for local control of meiotic recombination.

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26

Yamamoto, Isao, Masuhiro Yamaguchi, Noritaka Deguchi, and Shigeto Miura. "Magnetic Field Effects on the Chemical Equilibrium in LaCo₅-H System." Journal of the Japan Institute of Metals 61, no. 12 (1997): 1296–99. http://dx.doi.org/10.2320/jinstmet1952.61.12_1296.

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27

Velasco, Francisco, Noelia de la Pinta, Fernando Tornos, Thomas Briezewski, and Aitor Larrañaga. "The relationship of destinezite to the acid sulfate alteration at the El Laco magnetite deposit, Chile." American Mineralogist 105, no. 6 (June 1, 2020): 860–72. http://dx.doi.org/10.2138/am-2020-7122.

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Abstract Destinezite, ideally Fe23+(PO4)(SO4)(OH)·6(H2O), is found as nodular lumps in hematite-rich epiclastic sediments accumulated in small crater lakes on the slopes of El Laco volcano. These lumps are almost entirely dominated by fine-grained destinezite replacing earlier lipscombite, and associated with gray hematite. The crystal structure of destinezite has been re-examined to test for possible differences with respect to the earthy and poorly crystalline destinezite that forms by weathering in cave soils and mine waste dumps. The structural refinements confirm that the differences are minor. The El Laco destinezite was refined in space group P1 with a = 9.5828(2), b = 9.7440(3), c = 7.3302(3) Å, and α = 98.796(3)°, β = 107.985(3)°, γ = 63.898(2)°, V = 584.50(4) Å3, and Z = 1. We measured by calorimetry the enthalpy and derived the entropy and the Gibbs free energy of formation of destine-zite (–4051.7 ± 4.3, –1518.5 ± 20.0, and –3598.9 ± 7.1 kJ/mol, respectively). This has allowed us to estimate the equilibrium constant in the temperature range 0–300 °C (log K = –27.97 ± 1.1). We can predict that destinezite coexists with hematite over the range of conditions that typically encompass the steam-heated hydrothermal environments recognized at El Laco. The presence of destinezite along with hematite and the occurrence of alunite, jarosite, and variscite in the system provide evidence of intense hydrothermal alteration during the extrusion of Fe-rich melts at El Laco volcano. The mineral assemblage and the available geochemical data suggest that destinezite formed in hydrothermal conditions by “maturation” of an immiscible Fe–P-rich melt. An unknown Fe–P–O phase produced by this melt was first replaced by lipscombite and later, owing to intense sulfidation, by destinezite. This replacement took place in the vadose zone above the paleowater table by relatively cool (<150 °C) groundwaters acidified by oxidation of magmatic SO2 to aqueous sulfate in a steam-heated system. Our model precludes other modes of formation, such as devitrification of hypothetical Fe–P–S–O-rich melts ejected from the volcano and supergene crystallization.

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Bressan, Debra A., Julio Vazquez, and James E. Haber. "Mating type–dependent constraints on the mobility of the left arm of yeast chromosome III." Journal of Cell Biology 164, no. 3 (January 26, 2004): 361–71. http://dx.doi.org/10.1083/jcb.200311063.

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Mating-type gene (MAT) switching in budding yeast exhibits donor preference. MATa preferentially recombines with HML near the left telomere of chromosome III, whereas MATα prefers HMR near the right telomere. Donor preference is controlled by the recombination enhancer (RE) located proximal to HML. To test if HML is constrained in pairing with MATα, we examined live-cell mobility of LacI-GFP–bound lactose operator (lacO) arrays inserted at different chromosomal sites. Without induction of recombination, lacO sequences adjacent to HML are strongly constrained in both MATα and RE-deleted MATa strains, compared with MATa. In contrast, chromosome movement at HMR or near a telomere of chromosome V is mating-type independent. HML is more constrained in MATa Δre and less constrained in MATa RE+ compared with other sites. Although HML and MATa are not prealigned before inducing recombination, the three-dimensional configuration of MAT, HML, and HMR is mating-type dependent. These data suggest there is constitutive tethering of HML, which is relieved in MATa cells through the action of RE.

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29

Barnhart, Meghan C., P. Henning J. L. Kuich, Madison E. Stellfox, Jared A. Ward, Emily A. Bassett, Ben E. Black, and Daniel R. Foltz. "HJURP is a CENP-A chromatin assembly factor sufficient to form a functional de novo kinetochore." Journal of Cell Biology 194, no. 2 (July 18, 2011): 229–43. http://dx.doi.org/10.1083/jcb.201012017.

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Centromeres of higher eukaryotes are epigenetically marked by the centromere-specific CENP-A nucleosome. New CENP-A recruitment requires the CENP-A histone chaperone HJURP. In this paper, we show that a LacI (Lac repressor) fusion of HJURP drove the stable recruitment of CENP-A to a LacO (Lac operon) array at a noncentromeric locus. Ectopically targeted CENP-A chromatin at the LacO array was sufficient to direct the assembly of a functional centromere as indicated by the recruitment of the constitutive centromere-associated network proteins, the microtubule-binding protein NDC80, and the formation of stable kinetochore–microtubule attachments. An amino-terminal fragment of HJURP was able to assemble CENP-A nucleosomes in vitro, demonstrating that HJURP is a chromatin assembly factor. Furthermore, HJURP recruitment to endogenous centromeres required the Mis18 complex. Together, these data suggest that the role of the Mis18 complex in CENP-A deposition is to recruit HJURP and that the CENP-A nucleosome assembly activity of HJURP is responsible for centromeric chromatin assembly to maintain the epigenetic mark.

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30

Loïodice, Isabelle, Mickael Garnier, Ivaylo Nikolov, and Angela Taddei. "An Inducible System for Silencing Establishment Reveals a Stepwise Mechanism in Which Anchoring at the Nuclear Periphery Precedes Heterochromatin Formation." Cells 10, no. 11 (October 20, 2021): 2810. http://dx.doi.org/10.3390/cells10112810.

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In eukaryotic cells, silent chromatin is mainly found at the nuclear periphery forming subnuclear compartments that favor silencing establishment. Here, we set up an inducible system to monitor silencing establishment at an ectopic locus in relation with its subnuclear localization in budding yeast. We previously showed that introducing LacI bound lacO arrays in proximity to gene flanked by HML silencers favors the recruitment of the yeast silencing complex SIR at this locus, leading to its silencing and anchoring at the nuclear periphery. Using an inducible version of this system, we show that silencing establishment is a stepwise process occurring over several cell cycles, with the progressive recruitment of the SIR complex. In contrast, we observed a rapid, SIR-independent perinuclear anchoring, induced by the high amount of LacI binding at the lacO array leading to nucleosome eviction at this array and to the phosphorylation of H2A in the neighboring nucleosomes by Mec1 kinase. While the initial phosphorylation of H2A (H2A-P) and perinuclear anchoring are independent of the SIR complex, its latter recruitment stabilizes H2A-P and reinforces the perinuclear anchoring. Finally, we showed that Sir3 spreading stabilizes nucleosomes and limits the access of specific DNA-binding protein to DNA.

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31

Mravcová, Vladimíra. "Neistá Bratislava: medzi iniciáciou a imitáciou (Ivan Horváth: Laco a Bratislava)." Slovenská literatúra 68, no. 3 (May 10, 2021): 255–62. http://dx.doi.org/10.31577/slovlit.2021.68.3.5.

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32

Sun, Yaqi, Fang Yang, and Junnan Gao. "Novel Dimmable Visible Light Communication Approach Based on Hybrid LACO-OFDM." Journal of Lightwave Technology 36, no. 20 (October 15, 2018): 4942–51. http://dx.doi.org/10.1109/jlt.2018.2866825.

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33

Yan, Xinda, Jing He, Jin Shi, Zhihua Zhou, and Qi Tang. "Time-efficient adaptive modulation scheme for LACO-OFDM in VLC systems." Optics Communications 474 (November 2020): 126069. http://dx.doi.org/10.1016/j.optcom.2020.126069.

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34

Hu, Weiwen. "Design of a Cyclic Shifted LACO-OFDM for Optical Wireless Communication." IEEE Access 8 (2020): 76708–14. http://dx.doi.org/10.1109/access.2020.2989931.

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35

KWON, O., and M. SHIN. "LACO: A location-aware cooperative query system for securely personalized services." Expert Systems with Applications 34, no. 4 (May 2008): 2966–75. http://dx.doi.org/10.1016/j.eswa.2007.05.022.

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36

Zhang, Xintong, Wei Wang, Wenxin Shi, Jiaojie He, Hui Feng, Yongpeng Xu, Fuyi Cui, and Ce Wang. "Carbon nanofiber matrix with embedded LaCO3OH synchronously captures phosphate and organic carbon to starve bacteria." Journal of Materials Chemistry A 4, no. 33 (2016): 12799–806. http://dx.doi.org/10.1039/c6ta04364j.

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37

Zhang, Yong-Xing, Xiang-Bo Zhou, Zhong-Liang Liu, Qin-Zhuang Liu, Guang-Ping Zhu, Kai Dai, Bing Li, Bai Sun, Zhen Jin, and Xuan-Hua Li. "Green synthesis of monodispersed LaCO3OH microgears with novel plum blossom-like structure via a glycerol-mediated solvothermal method." RSC Advances 5, no. 28 (2015): 21925–30. http://dx.doi.org/10.1039/c4ra15800h.

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38

Defossé, Guillermo Emilio, María Marcela Godoy, and María Lila Bertolin. "Carbon balance and fire emissions in Andean cypress (Austrocedrus chilensis) forests of Patagonia, Argentina." International Journal of Wildland Fire 29, no. 8 (2020): 661. http://dx.doi.org/10.1071/wf19183.

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Wildfires are disturbances that affect forest structure and dynamics. Forests and the atmosphere interact in different ways; one is by emitting carbon (C) through wildfires and recapturing it by photosynthesis of regrowing vegetation. Estimation of C emissions and uptake allows monitoring and inventorying C at stand, landscape, or regional levels. We indirectly estimated C and other greenhouse gas emissions and uptake following Intergovernmental Panel on Climate Change (IPCC) guidelines, and also using growth curves derived from real data, in three burned pure Andean cypress (Austrocedrus chilensis) stands in Patagonia, Argentina. The sites, termed INTA (humid), LACO (mesic) and CECE (xeric), were burned on different dates (1987, INTA; 1999, CECE; 2008, LACO). Nearby unburned stands with similar structural and floristic characteristics were used as analogues to make our estimations. Carbon losses represented 245, 225, and 215t CO2 ha−1 for CECE, INTA and LACO respectively. Amount of carbon sequestered by post-fire vegetation depended on the time-lag from fire occurrence to date of sampling, whereas C uptake rates varied in time according to differences in site environmental conditions. Andean cypress seedlings present in burned stands suggest that outside the time needed, each site may recover not only lost C but also former structure and functions.

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39

Li, Bolong, Lulu Li, and Chen Zhao. "A highly stable Ru/LaCO3OH catalyst consisting of support-coated Ru nanoparticles in aqueous-phase hydrogenolysis reactions." Green Chemistry 19, no. 22 (2017): 5412–21. http://dx.doi.org/10.1039/c7gc02414b.

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40

Tilset, B. Gilbu, H. Fjellvåg, A. Kjekshus, B. C. Hauback, Ola Persson, Ruo-Hua Zhang, Kurt V. Mikkelsen, and Alexander Senning. "Properties of LaCo(1-t)Cr(t)O3. IV. Structure and Magnetism." Acta Chemica Scandinavica 52 (1998): 733–44. http://dx.doi.org/10.3891/acta.chem.scand.52-0733.

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41

Lacava, Cosimo, Zunaira Babar, Xiaoyu Zhang, Iosif Demirtzioglou, Periklis Petropoulos, and Lajos Hanzo. "High-speed multi-layer coded adaptive LACO-OFDM and its experimental verification." OSA Continuum 3, no. 9 (September 11, 2020): 2614. http://dx.doi.org/10.1364/osac.394227.

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42

Babar, Zunaira, Xiaoyu Zhang, Panagiotis Botsinis, Dimitrios Alanis, Daryus Chandra, Soon Xin Ng, and Lajos Hanzo. "Near-Capacity Multilayered Code Design for LACO-OFDM-Aided Optical Wireless Systems." IEEE Transactions on Vehicular Technology 68, no. 4 (April 2019): 4051–54. http://dx.doi.org/10.1109/tvt.2019.2896764.

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43

Garcés, Mercedes, Vicente Villanueva, José Angel Mauri, Ana Suller, Carolina García, Franscisco Javier López González, Xiana Rodríguez Osorio, et al. "Factors influencing response to intravenous lacosamide in emergency situations: LACO-IV study." Epilepsy & Behavior 36 (July 2014): 144–52. http://dx.doi.org/10.1016/j.yebeh.2014.05.015.

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44

Makshina, E. V., N. S. Nesterenko, S. Siffert, E. A. Zhilinskaya, A. Aboukais, and B. V. Romanovsky. "Methanol oxidation on LaCo mixed oxide supported onto MCM-41 molecular sieve." Catalysis Today 131, no. 1-4 (February 2008): 427–30. http://dx.doi.org/10.1016/j.cattod.2007.10.088.

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45

Kang, J. S., S. J. Youn, S. K. Kwon, and B. I. Min. "Effect of Fe substitution in the electronic structure of LaCo/sub 13/." IEEE Transactions on Magnetics 35, no. 5 (1999): 3283–85. http://dx.doi.org/10.1109/20.800499.

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46

Li, Baolong, Wei Xu, Simeng Feng, and Zhengquan Li. "Spectral-Efficient Reconstructed LACO-OFDM Transmission for Dimming Compatible Visible Light Communications." IEEE Photonics Journal 11, no. 1 (February 2019): 1–14. http://dx.doi.org/10.1109/jphot.2019.2892849.

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47

Sedwick, W. D., R. D. Anderson, J. Baxter, S. Donover, S. Schneiter, and M. L. Veigl. "Correlation of doxorubicin footprints with deletion endpoints in lacO of E. coli." Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 326, no. 1 (January 1995): 17–27. http://dx.doi.org/10.1016/0027-5107(94)00155-x.

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48

Ge, Xiaoming, Bing Li, Delvin Wuu, Afriyanti Sumboja, Tao An, T. S. Andy Hor, Yun Zong, and Zhaolin Liu. "Nanostructured Perovskite LaCo1-xMnxO3 as Bifunctional Catalysts for Rechargeable Metal–Air Batteries." Journal of Molecular and Engineering Materials 03, no. 01n02 (March 2015): 1540006. http://dx.doi.org/10.1142/s2251237315400067.

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Bifunctional catalyst that is active for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is one of the most important components of rechargeable metal–air batteries. Nanostructured perovskite bifunctional catalysts comprising La , Co and Mn ( LaCo 1-x Mn x O 3, LCMO ) are synthesized by hydrothermal methods. The morphology, structure and electrochemical activity of the perovskite bifunctional catalysts are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and rotating disk electrode (RDE) techniques. Nanorod, nanodisc and nanoparticle are typical morphologies of LCMO . The electrocatalytic activity of LCMO is significantly improved by the addition of conductive materials such as carbon nanotube. To demonstrate the practical utilization, LCMO in the composition of LaCo 0.8 Mn 0.2 O 3( LCMO82 ) is used as air cathode catalysts for rechargeable zinc–air batteries. The battery prototype can sustain 470 h or 40 discharge–charge cycles equivalent.

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Fuertes, V. C., M. C. Blanco, D. G. Franco, S. Ceppi, R. D. Sánchez, M. T. Fernández-Díaz, G. Tirao, and R. E. Carbonio. "A new LaCo0.71(1)V0.29(1)O2.97(3) perovskite containing vanadium in octahedral sites: synthesis and structural and magnetic characterization." Dalton Transactions 44, no. 23 (2015): 10721–27. http://dx.doi.org/10.1039/c4dt03858d.

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Xu, Lijuan, Minh Ngoc Ha, Qiangsheng Guo, Lichao Wang, Yanan Ren, Na Sha, and Zhe Zhao. "Photothermal catalytic activity of combustion synthesized LaCoxFe1−xO3 (0 ≤ x ≤ 1) perovskite for CO2 reduction with H2O to CH4 and CH3OH." RSC Adv. 7, no. 73 (2017): 45949–59. http://dx.doi.org/10.1039/c7ra04879c.

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