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Journal articles on the topic 'Dendritic olivine'

Author: Grafiati

Published: 23 September 2022

Last updated: 31 July 2025

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1

Lee, Cin-Ty, Chenguang Sun, Eytan Sharton-Bierig, et al. "Widespread phosphorous excess in olivine, rapid crystal growth, and implications for magma dynamics." Volcanica 5, no. 2 (2022): 433–50. http://dx.doi.org/10.30909/vol.05.02.433450.

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Trace element zoning is often used to unravel the crystallization history of phenocrysts in magmatic systems, but interpretation requires quantifying the relative importance of equilibrium versus disequilibrium. Published partition coefficients for phosphorous (P) in olivine vary by more than a factor of ten. After considering kinetic effects, a new equilibrium partition coefficient was extrapolated from a re-examination of natural and experimental systems, indicating that P partition coefficients in olivine are significantly over-estimated. These new partitioning constraints allow us to estab

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Welsch, Benoit, Julia Hammer, and Eric Hellebrand. "Phosphorus zoning reveals dendritic architecture of olivine." Geology 42, no. 10 (2014): 867–70. http://dx.doi.org/10.1130/g35691.1.

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Barnes, Stephen, Thorvaldur Thordarson, Robin E. T. Hill, Caroline S. Perring, Sarah E. Dowling, and Belinda Godel. "Moinui Flow on Mauna Loa: transport and deposition of an olivine crystal cargo in a compound basaltic lava flow." Volcanica 7, no. 1 (2024): 247–72. http://dx.doi.org/10.30909/vol.07.01.247272.

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The Moinui lava flow on the west flank of Mauna Loa, Hawai`i, is a 32-km-long pāhoehoe basalt flow, between 760 and 1500 years old, characterised by the presence of two generations of olivine: 2–5-mm-sized glomerocrystic clusters of equant polyhedral grains, and dendritic plates. Both generations are distributed throughout the flow field from the vent at 3400 m above sea level to the ocean. We mapped roadcut outcrops in detail to investigate the internal geometry and emplacement mechanisms of the flow, and sampled these outcrops to collect quantitative textural data on the two olivine populati

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Wieser, Penny E., Zoja Vukmanovic, Rüdiger Kilian, et al. "To sink, swim, twin, or nucleate: A critical appraisal of crystal aggregation processes." Geology 47, no. 10 (2019): 948–52. http://dx.doi.org/10.1130/g46660.1.

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Abstract Crystal aggregates in igneous rocks have been variously ascribed to growth processes (e.g., twinning, heterogeneous nucleation, epitaxial growth, dendritic growth), or dynamical processes (e.g., synneusis, accumulation during settling). We tested these hypotheses by quantifying the relative orientation of adjacent crystals using electron backscatter diffraction. Both olivine aggregates from Kīlauea volcano (Hawaiʻi, USA) and chromite aggregates from the Bushveld Complex (South Africa) show diverse attachment geometries inconsistent with growth processes. Near-random attachments in chr

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Sönmez, Taki, and Namık Aysal. "Crystal Morphology of Antarctic Micrometeorites Based on Melting–Cooling Processes During Atmospheric Entry." Crystals 15, no. 2 (2025): 179. https://doi.org/10.3390/cryst15020179.

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Micrometeorites (MMs), which are cosmic dust grains ranging from 10 microns to 2 mm in size, can reach the Earth’s surface through collisions with asteroids or by fragmentation of comets in space. When MMs enter the atmosphere, they are heated to varying degrees depending on their size, mass, speed, and angle of entry. As a result of friction during atmospheric entry, MMs undergo partial melting and subsequently recrystallize during undercooling. In this study, we focused on molten micrometeorites and identified four main types: silicate, glassy, ferruginous, and intermediate forms. The minera

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Xing, Chang-Ming, Christina Yan Wang, Bernard Charlier, and Olivier Namur. "Ubiquitous dendritic olivine constructs initial crystal framework of mafic magma chamber." Earth and Planetary Science Letters 594 (September 2022): 117710. http://dx.doi.org/10.1016/j.epsl.2022.117710.

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Shevko, A. Ya, D. V. Kuzmin, S. Z. Smirnov, M. P. Gora, I. R. Nizametdinov, and T. Yu Timina. "OLIVINE-ANORTHITE SPHERULITES OF KUDRYAVY VOLCANO: CRYSTALLIZATION CONDITIONS IN A SHALLOW CHAMBER." Tikhookeanskaya Geologiya 44, no. 2 (2025): 85–108. https://doi.org/10.30911/0207-4028-2025-44-2-85-108.

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The article is focused on the nature of olivine-plagioclase (allivalite) spherulites from a young basaltic andesite lava flow of the Kudryavy volcano. Spherulites are composed mainly of olivine (Fo81-77) and plagioclase (An95-92) and have a radial structure, which is not typical for allivalites of the Kuril-Kamchatka region. The study of mineral composition and primary melt inclusions in olivine showed that they formed from a low-alumina, low-potassium melt at temperatures of 970–1075 °C and oxygen fugacity corresponding to the NNO + 1.5 buffer. A characteristic feature of the initial melts wa

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Basch, Valentin, Elisabetta Rampone, Laura Crispini, Carlotta Ferrando, Benoit Ildefonse, and Marguerite Godard. "Multi-stage Reactive Formation of Troctolites in Slow-spreading Oceanic Lithosphere (Erro–Tobbio, Italy): a Combined Field and Petrochemical Study." Journal of Petrology 60, no. 5 (2019): 873–906. http://dx.doi.org/10.1093/petrology/egz019.

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Abstract Many recent studies have investigated the replacive formation of troctolites from mantle protoliths and the compositional evolution of the percolating melt during melt–rock interaction processes. However, strong structural and geochemical constraints for a replacive origin have not yet been established. The Erro–Tobbio impregnated mantle peridotites are primarily associated with a hectometre-size troctolitic body and crosscutting gabbroic dykes, providing a good field control on melt–rock interaction processes and subsequent magmatic intrusions. The troctolitic body exhibits high inne

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Welsch, Benoît, François Faure, Vincent Famin, Alain Baronnet, and Patrick Bachèlery. "Dendritic Crystallization: A Single Process for all the Textures of Olivine in Basalts?" Journal of Petrology 54, no. 3 (2012): 539–74. http://dx.doi.org/10.1093/petrology/egs077.

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Vítková, M., V. Ettler, Z. Johan, B. Kříbek, O. Šebek, and M. Mihaljevič. "Primary and secondary phases in copper-cobalt smelting slags from the Copperbelt Province, Zambia." Mineralogical Magazine 74, no. 4 (2010): 581–600. http://dx.doi.org/10.1180/minmag.2010.074.4.581.

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AbstractPyrometallurgical slags from three Cu-Co smelters (Nkana, Mufulira, Chambishi) in the Copperbelt Province, Zambia, were studied from mineralogical and chemical points of view. The slags were enriched in metals and metalloids, mainly Cu (up to 35 wt.%), Co (up to 2.4 wt.%) and As (up to 3650 ppm). The following primary phases were observed in slags: Ca-Fe silicates (clinopyroxene, olivine) and leucite, oxides (spinel-series phases), ubiquitous silicate glass and sulphide/metallic droplets of various sizes. The presence of glass and skeletal/dendritic crystal shapes indicated rapid cooli

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Aysal, Namık, Yiğit Kurt, Hüseyin Öztürk, et al. "Crystallization Kinetics: Relationship between Crystal Morphology and the Cooling Rate—Applications for Different Geological Materials." Crystals 13, no. 7 (2023): 1130. http://dx.doi.org/10.3390/cryst13071130.

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Crystal morphology is controlled by several physicochemical parameters such as the temperature, pressure, cooling rate, nucleation, diffusion, volatile composition, and viscosity. The development of different crystal morphologies is observed as a function of the cooling rate in many different rock types (i.e., glassy volcanic rocks, and archeometallurgical slags). Crystallization is a two-stage kinetic process that begins with the formation of a nucleus and then continues with the accumulation of ions on it. The shapes of the crystals depend on the degree of undercooling (ΔT), and euhedral cry

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Wenk, Hans-Rudolf, Rong Yu, Nobumichi Tamura, Duri Bischoff, and Walter Hunkeler. "Slags as Evidence for Copper Mining above Casaccia, Val Bregaglia (Central Alps)." Minerals 9, no. 5 (2019): 292. http://dx.doi.org/10.3390/min9050292.

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Slags from the remote Mota Farun locality above Casaccia (Val Bregaglia, Swiss Alps) have been analyzed with scanning electron microscopy, X-ray powder diffraction and microfocus synchrotron X-ray diffraction to determine mineralogical composition and microstructures. Non-magnetic slag samples are largely composed of euhedral and dendritic iron-rich olivine in a glassy matrix. Locally there are zones with globular inclusions rich in bornite ((Cu5Fe)S4) and locally metallic copper. Some regions display dendritic pentlandite ((Fe,Ni)9S8). Magnetic samples are mainly composed of fayalite (Fe2SiO4

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13

Kitchen, D. E. "The partial melting of basalt and its enclosed mineral-filled cavities at Scawt Hill, Co. Antrim." Mineralogical Magazine 49, no. 354 (1985): 655–62. http://dx.doi.org/10.1180/minmag.1985.049.354.04.

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AbstractPartially melted basalts enclosing amygdales which have been completely melted formed at Scawt Hill adjacent to a Tertiary dolerite plug. Melting of the basalts commenced in a clay-rich mesostasis to produce a feldspathic liquid which then crystallized to an assemblage of dendritic olivine, skeletal hypersthene, opaque oxide and Mg-hercynite in a microcrystalline plagioclase matrix. An original mineral assemblage of zeolite, calcite, and saponite-nontronite in the amygdales melted and quenched to a brown glass now containing complexly zoned pyroxenes with plagioclase and opaque oxide.

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Wilson, Allan H. "The Late-Paleoarchean Ultra-Depleted Commondale Komatiites: Earth's Hottest Lavas and Consequences for Eruption." Journal of Petrology 60, no. 8 (2019): 1575–620. http://dx.doi.org/10.1093/petrology/egz040.

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Abstract The c.3·3 Ga Commondale komatiites located south of the Barberton greenstone belt in the Kaapvaal Craton are different from other komatiites, possessing compositional and textural features unique to this occurrence. Unlike almost all other known komatiite occurrences, they are not associated with komatiitic basalts or basalts. The komatiite flows are 0·5–25 m thick and are made up of a marginal zone of spinifex-textured and fine-grained aphyric rocks (low-Mg group) and an inner zone of olivine cumulates (high-Mg group), arranged in such a way to give highly symmetrical compositional p

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Haji Muhammad, Bilal jan, Wang Ping, Muhammad Jalal Mohabbat, Ihtisham Islam, and Imtiaz Ahmad. "The COMPARATIVE ANALYSIS OF MECHANICAL STRENGTH AND PETROGRAPHIC FEATURES OF ANDESITE AND BASALT FROM SAWABI AREA, N-W PAKISTAN: IMPLICATIONS FOR CONSTRUCTION ENGINEERING." Journal of Mountain Area Research 9 (May 8, 2024): 92. http://dx.doi.org/10.53874/jmar.v9i0.199.

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This study delves into a comparative analysis of the mechanical properties and petrographic characteristics of andesite and basalt from the Sawabi area in North-West Pakistan, with a focus on uniaxial tensile strength (UTS) and uniaxial compressive strength (UCS). Mega-porphyritic and badinage textures, as well as a huge, fine-grained structure, define the basaltic rocks of Swabi. These rocks are mostly composed of ferro-magnesium minerals such as olivine, pyroxene, and amphibole; as accessory minerals, they also include quartz, plagioclase, and alkali feldspar. On the other hand, the andesiti

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Claydon, R. V., and B. R. Bell. "The structure and petrology of ultrabasic rocks in the southern part of the Cuillin Igneous Complex, Isle of Skye." Transactions of the Royal Society of Edinburgh: Earth Sciences 83, no. 4 (1992): 635–53. http://dx.doi.org/10.1017/s0263593300003345.

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AbstractThe ultrabasic rocks of the southern portion of the Early Tertiary Cuillin Igneous Complex, Isle of Skye, are recognised as forming a Peridotite Series s.l. and have been separated into six distinct structural–lithological units. These units range from almost pure dunite (Unit 1, at the lowest structural level), through to feldspathic peridotites and allivalites (Units 5 and 6, at the highest structural levels). Detailed field and mineralogical studies indicate that both cumulus and postcumulus processes involving ultrabasic (picritic) magmas may be identified, and that the latter proc

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17

Horta, Susana, and Antero Fraga. "“AZORES GEMS AND MINERALS” - Envolva-se na riqueza e arte que a natureza dos Açores oferece!" Boletim do Museu de Geociências da Amazônia 12, no. 2 (2025): 1–9. https://doi.org/10.31419/issn.2594-942x.v122025i2a4sh.

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Azores Gems and Minerals strives to uncover the geological richness of the Azores, converting its minerals and gems into unique jewelry and single collection objects. Normally restricted to academic research, these natural treasures became accessible to the public, through the brand’s pieces, which combine art and scientific rigor. Each item, made of minerals such as sandy olivines, peridots, and dendritic agates, among others, is accompanied by a gemological report, which provides details about the origin, characteristics as well as a small description about the mineral. Sustainability is an

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Liu, Feng-Quan, Wen-Peng Wang, Ya-Xia Yin, et al. "Upgrading traditional liquid electrolyte via in situ gelation for future lithium metal batteries." Science Advances 4, no. 10 (2018): eaat5383. http://dx.doi.org/10.1126/sciadv.aat5383.

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High-energy lithium metal batteries (LMBs) are expected to play important roles in the next-generation energy storage systems. However, the uncontrolled Li dendrite growth in liquid electrolytes still impedes LMBs from authentic commercialization. Upgrading the traditional electrolyte system from liquid to solid and quasi-solid has therefore become a key issue for prospective LMBs. From this premise, it is particularly urgent to exploit facile strategies to accomplish this goal. We report that commercialized liquid electrolyte can be easily converted into a novel quasi-solid gel polymer electr

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Hoffmann, Caroline, Floriane Noël, Maximilien Grandclaudon, et al. "Abstract 2105: PD-L1 high ICOSL low Secretory dendritic cells infiltrate human solid tumors." Cancer Research 82, no. 12_Supplement (2022): 2105. http://dx.doi.org/10.1158/1538-7445.am2022-2105.

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Abstract Background: Human conventional dendritic cells (cDC) are essential for the anti-tumor immune response. Their immunogenic and tolerogenic states in cancer remain controversial. Our objective was to define the range of DC activation states in vitro and to determine their relevance ex vivo in cancer. Methods: First, in vitro, we activated healthy donor cDC with 16 different stimuli and measured cDC and T cells cytokine and chemokine secretion upon co-culture (n = 130 individual experiments) to define new maturation archetypes. Second, we established the relevance of these archetypes in c

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Delgado-Arévalo, C., M. Calvet-Mirabent, A. Triguero-Martinez та ін. "POS0367 NLRC4 AND FC-γ-R CROSSTALK ON CD1C+ DENDRITIC CELLS DIFFERENTIALLY CONTRIBUTES TO RHEUMATOID ARTHRITIS IMMUNOPATHOLOGY". Annals of the Rheumatic Diseases 80, Suppl 1 (2021): 413.2–413. http://dx.doi.org/10.1136/annrheumdis-2021-eular.3192.

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Background:Rheumatoid arthritis (RA) is an autoimmune disorder in which Th17 cells, B cells and inflammatory cytokines (1-3) contribute to joint tissue damage, however the role of specific myeloid populations to immunopathogenesis of RA remains unclear.Objectives:To address this question, we studied transcriptional, phenotypical and functional characteristics of monocytes (Mo), CD1c+ and CD141+ conventional dendritic cells (cDC) from RA patients.Methods:Frequencies and maturation patterns of Lin-CD14-HLADR+ plasmacytoid (CD11c-), CD1c+ and CD141+ cDC (CD11c+) subsets and CD14+ Mo from n=25 RA

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Pagadala, Meghana, Victoria Wu, Eva Pérez-Guijarro, et al. "Abstract 3825: Germline modifiers of the tumor immune microenvironment reveal drivers of immunotherapy response." Cancer Research 82, no. 12_Supplement (2022): 3825. http://dx.doi.org/10.1158/1538-7445.am2022-3825.

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Abstract With the continued promise of immunotherapy as an avenue for treating cancer, understanding how host genetics contributes to the tumor immune microenvironment (TIME) is essential to tailoring cancer risk screening and treatment strategies. Using genotypes from over 8,000 European individuals in The Cancer Genome Atlas and 137 heritable tumor immune phenotype components (IP components), we identified and investigated 532 TIME-SNPs. Focusing on 77 variants that were relevant to cancer risk, survival, or treatment response, we explored their potential to reveal novel targets for immunoth

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Klaver, Elsenoor, Henry Leonard, Elizabeth Lieverse, et al. "Abstract 3975: A therapeutic screening platform for assessing antigen-specific T cell-mediated tumor killing in vitro." Cancer Research 84, no. 6_Supplement (2024): 3975. http://dx.doi.org/10.1158/1538-7445.am2024-3975.

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Abstract Many cancers remain resistant to conventional therapies, consequently there has been an exponential rise in the number of therapeutics harnessing the power of the immune system in an oncology setting, with several remarkable examples of success. High frequencies of infiltrating tumor-specific T cells have been linked to improved patient outcomes, which highlights the importance of uncovering how therapeutics can enhance their function. To explore this functionality in a preclinical setting it is critical to have physiologically relevant models. Here, we demonstrate that common issues,

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Maier, M. A., E. Olivier, S. N. Baker, P. A. Kirkwood, T. Morris, and R. N. Lemon. "Direct and Indirect Corticospinal Control of Arm and Hand Motoneurons in the Squirrel Monkey (Saimiri sciureus)." Journal of Neurophysiology 78, no. 2 (1997): 721–33. http://dx.doi.org/10.1152/jn.1997.78.2.721.

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Maier, M. A., E. Olivier, S. N. Baker, P. A. Kirkwood, T. Morris, and R. N. Lemon. Direct and indirect corticospinal control of arm and hand motoneurons in the squirrel monkey ( Saimiri sciureus). J. Neurophysiol. 78: 721–733, 1997. Anatomic evidence suggests that direct corticomotoneuronal (CM) projections to hand motoneurons in the New World squirrel monkey ( Saimiri sciureus) are weak or absent, but electrophysiological evidence is lacking. The nature of the corticospinal linkage to these motoneurons was therefore investigated first with the use of transcranial magnetic stimulation (TMS) of

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Rohlff, Christian, Solmaz Sahebjam, Alain Mita, et al. "Abstract 1975: Potential novel Immuno-oncology mechanism revealed during translational phase I Immuno-blood profiling of experimental ADC medicine OBT076 in a gastric cancer patient." Cancer Research 82, no. 12_Supplement (2022): 1975. http://dx.doi.org/10.1158/1538-7445.am2022-1975.

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Abstract CD205 is a type I transmembrane glycoprotein, with unique characteristics that make it an ideal target for Antibody Drug Conjugate (ADC) therapy. Here we report on a potential novel immuno-oncology mechanism revealed during the Translational Phase I (NCT04064359) immuno-blood profiling of a chemo-refractory patient treated with OBT076, an experimental CD205-directed ADC. A chemo-refractory advanced gastric cancer patient with 60% CD205 expression in the primary tumor via IHC and having previously undergone 2 lines of chemotherapy treatment (Docetaxel/cisplatin/5FU and Ramucirumab/Pacl

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Krishnan, Shanmugarajan, Bishnu Joshi, Justin Keith, et al. "Abstract 1331: MiNK-215, an IL-15 armored FAP-targeting CAR iNKT cell therapy, effectively treats human organoid models of treatment-refractory MSS colorectal cancer (CRC) liver metastases." Cancer Research 84, no. 6_Supplement (2024): 1331. http://dx.doi.org/10.1158/1538-7445.am2024-1331.

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Abstract The presence of liver metastases in patients with microsatellite-stable (MSS) or mismatch repair proficient (pMMR) colorectal cancer (CRC) is associated with poor response to current pharmacological treatments, including immune checkpoint blockade (ICB). The tumor microenvironment (TME) of CRC liver metastases is characterized by a highly immunosuppressive phenotype that includes poor immunogenicity, a paucity of dendritic cells, elimination of tumor-specific effector T cells, and an abundance of immunosuppressive intrahepatic Kupffer cells and myeloid-derived suppressor cells. This u

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Hoffmann, Caroline, Jan-Timon Werle, Jocelyn Gal, et al. "Abstract 4603: Single-cell and spatial dissection of the effect of combined PD-L1 and TGFb blockade by bintrafusp alfa from the ICING window-of-opportunity trial in resectable locally advanced HNSCC patients." Cancer Research 84, no. 6_Supplement (2024): 4603. http://dx.doi.org/10.1158/1538-7445.am2024-4603.

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Abstract Despite high tumor mutational burden, immune checkpoint blockade has shown limited efficacy in head and neck squamous cell carcinoma (HNSCC), highlighting the need for additional therapeutic targets. TGFb signaling has been associated with an immunosuppressive tumor microenvironment as well as a lack of response to anti-PD(L)1 therapy, which led to the development of combined therapeutic approaches. ICING is a prospective (NCT04428047) open label, multicenter, phase II, window-of-opportunity preoperative, single-agent trial. The primary objective was to evaluate the efficacy and biolo

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Zhou, Yanlong, Nicolas Emery, Jean-Pierre Pereira-Ramos, Oliver Nguyen, and Rita Baddour-Hadjean. "(Digital Presentation) Lithium Transition Metal Nitride Li₇MnN₄ (LMN) As Competitive Negative Electrode Material for Li-Ion Battery: Synthesis Optimization and High Energy Density of the NMC/Li_5.3MnN₄ Full Cell." ECS Meeting Abstracts MA2022-01, no. 2 (2022): 363. http://dx.doi.org/10.1149/ma2022-012363mtgabs.

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Li-on battery (LIB) is an important technology which is widely used in portable electronic devices, electric vehicles (EV) and other energy storage applications. Commercial LIB has multiple choices as positive electrode materials such as layered transition metal oxides (LiCoO2, LiNi1-y-zMnyCozO2...), spinel oxides LiNixMn2-xO4 as well as olivine LiFePO4. Conversely, the selection of negative electrodes is mainly limited to graphite or Li4Ti5O12 (LTO). Graphite is inexpensive and delivers large capacity but suffers from the formation of solid electrolyte interphase (SEI) as well as Li dendrites

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De Maleprade, B., B. Gerard, P. Brevet, et al. "POS0242 RESPONSE TO ABATACEPT IN RHEUMATOID ARTHRITIS PATIENTS REQUIRES A SPECIFIC MACROPHAGE POLARISATION." Annals of the Rheumatic Diseases 82, Suppl 1 (2023): 354–55. http://dx.doi.org/10.1136/annrheumdis-2023-eular.1094.

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BackgroundAbatacept (ABA), a biologic treatment for rheumatoid arthritis (RA), is a recombinant fusion protein composed of the extracellular domain of human CTLA-4 combined with the Fc portion of human IgG1. Lack of response to treatment occurs in 30 % of RA patients, highlighting the need to better understanding its mechanism of action and to identify predictive factors of response. Although ABA is considered to interrupt the costimulatory signal, the importance of this mechanism on the drug effect lacks evidence. Moreover, therapies targeting T cells were disappointing in RA [1]. In contrast

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Salas, Pablo, Philipp Ruprecht, Laura Hernández, and Osvaldo Rabbia. "Out-of-sequence skeletal growth causing oscillatory zoning in arc olivines." Nature Communications 12, no. 1 (2021). http://dx.doi.org/10.1038/s41467-021-24275-6.

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AbstractPrimitive olivines from the monogenetic cones Los Hornitos, Central-South Andes, preserve dendritic, skeletal, and polyhedral growth textures. Consecutive stages of textural maturation occur along compositional gradients where high Fo–Ni cores of polyhedral olivines (Fo92.5, Ni ~3500 ppm) contrast with the composition of dendritic olivines (Fo < 91.5, Ni < 3000 ppm), indicating sequential nucleation. Here we present a new growth model for oscillatory Fo–Ni olivine zoning that contrasts with the standard interpretation of continuous, sequential core-to-rim growth. Olivine grows ra

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Zhang, Haoran, Xiwei Xu, and Saihong Yang. "Ultramafic pseudotachylytes in high-pressure metamorphogenic peridotite from Luobusha, Tibet: a record of crustal paleo-earthquakes." Frontiers in Earth Science 11 (October 12, 2023). http://dx.doi.org/10.3389/feart.2023.1267211.

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In this paper, we report an occurrence of ultramafic pseudotachylytes, providing fault-rock evidence of paleo-earthquakes, from the Luobusha ophiolite complex in the Yarlung Zangbo suture zone. The pseudotachylytes form hairline-thin aphanitic veinlets and vein networks bounded by micro-damage zones cutting through the host harzburgite, forming flow banding in some places. The pseudotachylyte veins are dominated by close-knit ultrafine-grained minerals consisting of olivine, orthopyroxene, serpentine, spinel, and magnetite, cemented by an extremely fine matrix. As the primary component of the

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Beno, Carl J., John R. Bowman, Patrick C. Loury, Lorraine M. Tapanila, and Diego P. Fernandez. "Evidence for dendritic crystallization of forsterite olivine during contact metamorphism of siliceous dolostones, Alta stock aureole, Utah." Contributions to Mineralogy and Petrology 175, no. 10 (2020). http://dx.doi.org/10.1007/s00410-020-01734-9.

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Nozaki, Tatsuo, Junichiro Ohta, Takaaki Noguchi, et al. "A Miocene impact ejecta layer in the pelagic Pacific Ocean." Scientific Reports 9, no. 1 (2019). http://dx.doi.org/10.1038/s41598-019-52709-1.

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AbstractMeteorite impacts have caused catastrophic perturbations to the global environment and mass extinctions throughout the Earth’s history. Here, we present petrographic and geochemical evidence of a possible impact ejecta layer, dating from about 11 Ma, in deep-sea clayey sediment in the Northwest Pacific. This clay layer has high platinum group element (PGE) concentrations and features a conspicuous negative Os isotope anomaly (187Os/188Os as low as ~0.2), indicating an influx of extraterrestrial material. It also contains abundant spherules that include pseudomorphs suggestive of porphy

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Welsch, Benoît, François Faure, and Emily C. First. "Reappraising Crystallization Kinetics with Overgrowth Chronometry: An In Situ Study of Olivine Growth Velocities." Journal of Petrology, August 1, 2023. http://dx.doi.org/10.1093/petrology/egad055.

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Abstract We investigated the early stages of olivine crystal growth via in situ seeded experiments in a single plagioclase-hosted melt inclusion, using a heating stage microscope. Each experiment was subjected to a cooling ramp of 7800 °C/h followed by an isothermal dwell at 19, 38, 57, 77, 96 or 129 °C of undercooling. The seeds (6 – 16 μm in diameter Ø) grew into large crystals (Ø 80 – 169 μm) in 3 to 30 min through the symmetrical development of tabular, skeletal, and dendritic overgrowths as the undercooling of the system increased. Time-resolved image processing and incremental measuremen

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Wieser, Penny E., Marie Edmonds, John Maclennan та John Wheeler. "Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawaiʻi". Nature Communications 11, № 1 (2020). http://dx.doi.org/10.1038/s41467-019-13635-y.

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Abstract:

AbstractDistorted olivines of enigmatic origin are ubiquitous in erupted products from a wide range of volcanic systems (e.g., Hawaiʻi, Iceland, Andes). Investigation of these features at Kīlauea Volcano, Hawaiʻi, using an integrative crystallographic and chemical approach places quantitative constraints on mush pile thicknesses. Electron backscatter diffraction (EBSD) reveals that the microstructural features of distorted olivines, whose chemical composition is distinct from undistorted olivines, are remarkably similar to olivines within deformed mantle peridotites, but inconsistent with an o

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