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Dye-sensitized er^(3+)-doped CaF_(2)nanoparticles for enhanced near-infrared emission at 1.5μm

Photonics Research 2021年第10期9卷 2037-2045页

作者： JING LIU FLAVIA ARTIZZU mIN ZENG luca PILIA PIETer GEIREGAT RIK VAN DEUN Key Laboratory of Luminescence Analysis and molecular Sensing Ministry of EducationSchool of Materials and EnergySouthwest UniversityChongqing 400715China Department of Chemistry Ghent UniversityB-9000 GhentBelgium Department of Sciences and Technological Innovation University of Eastern Piedmont“Amedeo Avogadro”15121 AlessandriaItaly Department of mechanical Chemical and Material EngineeringUniversity of Cagliari09123 CagliariItaly

Lanthanide(Ln)-doped nanoparticles have shown potential for applications in various ***,the weak and narrow absorption bands of the Ln ions(Ln^(3+)),hamper efficient optical pumping and severely limit the emission *** sensitization is a promising way to boost the near-infrared(NIR)emission of er^(3+),hence promoting possible application in optical amplification at 1.5μm,a region that is much sought after for telecommunication ***,we introduce the fluorescein isothiocyanate(FITC)organic dye with large absorption cross section as energy donor of small-sized(∼3.6 nm)er^(3+)-doped CaF_(2)*** molecules on the surface of CaF_(2)work as antennas to efficiently absorb light,and provide the indirect sensitization of er^(3+)boosting its *** this paper,we employ photoluminescence and transient absorption spectroscopy,as well as density functional theory calculations,to provide an in-depth investigation of the FITC→er^(3+)energy transfer *** show that an energy transfer efficiency of over 89%is achieved in CaF_(2):er^(3+)@FITC nanoparticles resulting in a 28 times enhancement of the er^(3+)NIR emission with respect to bare CaF_(2):er^(3+).Through the multidisciplinary approach used in our work,we are able to show that the reason for such high sensitization efficiency stems from the suitable size and geometry of the FITC dye with a localized transition dipole moment at a short distance from the surface of the nanoparticle.

关键词： process. absorption hence

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Least speciose among the most speciose:Natural history correlates of monospecific and bispecific genera of Rodentia and Soricomorpha

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Integrative Zoology 2017年第6期12卷 489-499页

作者： Giovanni AmORI Alessandra maria BISSATTINI Spartaco GIPPOLITI Leonardo VIGNOLI Luigi mAIORANO luca LUISELLI CNR Institute of Ecosystem StudiesRomeItaly Department of Science University Roma TreRomeItaly SocietàItaliana di Storia della Fauna RomeItaly Department of Biology and Biotechnology Charles Darwin Sapienza UniversityRomeItaly Department of Applied and Environmental Biology Rivers State University of Science and TechnologyPort HarcourtNigeria and Institute for DevelopmentEcologyConservation and CooperationRomeItaly

monospecific and bispecific genera are of special concern as they represent unique phylogenetic/evolutionary trajectories within larger *** addition,as phylogenetically older taxa are supposed to be exposed to higher rarity and extinction risk,monospecific and bispecific genera may be intrinsically more prone to extinction risks than multispecies genera,although extinction risks also depend on the ecological and biological strategy of the ***,the distribution across biogeographical zones and the levels of threat to 2 speciose orders of mammals(monospecific and bispecific genera of Rodentia and Soricomorpha)are investigated in order to highlight major patterns at the worldwide *** Rodentia,39.7%of the genera(n=490)were monospecific and 17.9%were *** Soricomorpha,44.4%of the total genera(n=45)were monospecific and 15%were *** was a positive correlation between the number of monospecific genera and the total number of genera per *** of monospecific and bispecific genera richness were observed in Neotropical,Oriental and Afrotropical regions in rodents and in the Palearctic region in *** size was significantly uneven across biogeographic region in rodents(with larger ranges in Nearctic and Oriental regions and smaller ranges in the Australian region),but there was no difference across biogeographic regions in terms of range size in *** of the monospecific and bispecific genera occurred in forest habitat in both *** frequency distribution of the monospecific and bispecific genera across IUCN categories did not differ significantly from the expected pattern using the total rodent genera and the multispecies genera.

关键词： bispecific genera conservation monospecific genera Rodentia Soricomorpha

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An in-depth multi-technique characterization of rare earth carbonates-RE_(2)(CO_(3))_(3)·2H_(2)O-owning tengerite-type structure

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Journal of Rare Earths 2022年第8期40卷 1281-1290页

作者： luca Spiridigliozzi mauro Bortolotti Grazia Accardo Alessandro Vergara Domenico Frattini Claudio Ferone Raffaele Cioffi Gianfranco Dell'Agli Department of Civil and mechanical Engineering University of Cassino and Southern LazioVia G.Di Biasio 4303043Cassino(FR)Italy Department of Industrial Engineering University of TrentoVia Sommarive 938123TrentoItaly Center of Hydrogen-Fuel Cell Research Korea Institute of Science and TechnologyHwarang-ro 14-gilSeongbuk-guSeoul136-791Republic of Korea Centre for Cooperative Research on Alternative Energies(CIC EnergiGUNE) Basque Research and Technology Alliance(BRTA)Alava Technology ParkCalle Albert Einstein 4801510Vitoria-GasteizSpain Department of Chemical Sciences University of Napoli“Federico II”Via Cintia80126NapoliItaly Graduate School of Energy and Environment Seoul National University of Science and TechnologyGongneung-ro 232Nowon-guRepublic of Korea Department of Engineering University of Napoli“Parthenope”Centro DirezionaleIsola C480143Napoli(NA)Italy INSTm-National Interuniversity Consortium of materials Science and Technology

The present study has been conducted to contribute,once and for all,filling the lack of structural information for the whole class of rare earth(RE)carbonates owning the tengerite-(Y)structure.A complete structural characterization,carried out by Rietveld refinement of X-ray powder diffraction(XRD)data,was comparatively performed for the first time on several hydrated RE carbonates,having the general chemical formula RE_(2)(CO_(3))_(3)·χH_(2)O,RE=Y,Gd,Tb,Dy,Ho and *** samples share the same space group and lattice parameters similar to tengerite-(Y);the structures are also closely related,consisting in all cases of a three-dimensional framework of nine-fold coordinated RE atom polyhedral,linked together by carbonate *** addition to relatively minor changes in fractional coordinates of atom sites and corresponding interatomic distances,the only perceivable difference lies in the lattice parameters affected by the ionic radius of RE^(3+).However,in the case of er,which has the lowest cationic radius among the analyzed RE,the stabilization of tengerite structure is at its limit condition,because the carbonate groups are heavily ***,FT-IR and Raman spectra confirm the main structural features obtained by Rietveld *** observed morphology of the various samples is almost the same,being characterized by the presence of bidimensional rod-like particles grouped in agglomerates,typical of tengerite crystals,thus indicating that the crystallization mechanism occurring during the hydrothermal synthesis is the same,irrespective of the involved RE cation.

关键词： Rare Earth carbonates Tengerite Structural refinement Hydrothermal treatment

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3D-printed bioactive scaffolds from nanosilicates and PEOT/PBT for bone tissue engineering

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Regenerative Biomaterials 2019年第1期6卷 29-37页

作者： James K.Carrow Andrea Di luca Alireza Dolatshahi-Pirouz Lorenzo moroni Akhilesh K.Gaharwar Department of Biomedical Engineering Texas A&M UniversityCollege StationTX 77843USA Tissue Regeneration Department MIRA Institute for Biomedical Technology and Technical MedicineUniversity of TwenteEnschedeThe Netherlands DTU Nanotech Center for Intestinal Absorption and Transport of BiopharmaceuticalsTechnical University of Denmark2800 KgsLyngbyDenmark Department of Complex Tissue Regeneration MERLN Institute for Technology-Inspired Regenerative MedicineMaastricht UniversityUniversiteitsingel 406229ER MaastrichtThe Netherlands Department of materials Science Texas A&M UniversityCollege StationTX 77843USA Center for Remote Health Technologies and Systems Texas A&M UniversityCollege StationTX 77843USA

Additive manufacturing(Am)has shown promise in designing 3D scaffold for regenerative ***,many synthetic biomaterials used for Am are ***,we report synthesis of bioactive nanocomposites from a poly(ethylene oxide terephthalate)(PEOT)/poly(butylene terephthalate)(PBT)(PEOT/PBT)copolymer and 2D nanosilicates for fabricating 3D scaffolds for bone tissue ***/PBT have been shown to support calcification and bone bonding ability in vivo,while 2D nanosilicates induce osteogenic differentiation of human mesenchymal stem cells(hmSCs)in absence of osteoinductive *** effect of nanosilicates addition to PEOT/PBT on structural,mechanical and biological properties is ***,the addition of nanosilicate to PEOT/PBT improves the stability of nanocomposites in physiological conditions,as nanosilicate suppressed the degradation rate of ***,no significant increase in the mechanical stiffness of scaffold due to the addition of nanosilicates is *** addition of nanosilicates to PEOT/PBT improves the bioactive properties of Am nanocomposites as demonstrated in *** readily proliferated on the scaffolds containing nanosilicates and resulted in significant upregulation of osteo-related proteins and production of mineralized *** synergistic ability of nanosilicates and PEOT/PBT can be utilized for designing bioactive scaffolds for bone tissue engineering.

关键词： 3D printing nanocomposites two dimensional(2D)nanoparticles copolymer tissue engineering

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The airborne contagiousness of respiratory viruses:A comparative analysis and implications for mitigation

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Geoscience Frontiers 2022年第6期13卷 257-264页

作者： Alex mikszewski luca Stabile Giorgio Buonanno Lidia morawska International Laboratory for Air Quality and Health Queensland University of TechnologyBrisbaneQueenslandAustralia CIUS Building Performance Lab The City University of New YorkNew YorkNYUSA Department of Civil and mechanical Engineering University of Cassino and Southern LazioCassinoFRItaly Global Centre for Clean Air Research(GCARE) Department of Civil and Environmental EngineeringFaculty of Engineering and Physical SciencesUniversity of SurreyGuildford GU27XHUnited Kingdom

The infectious emission rate is a fundamental input parameter for airborne transmission risk assessment,but data are limited due to reliance on estimates from chance superspreading *** study assesses the strength of a predictive estimation approach developed by the authors for SARS-CoV-2 and uses novel estimates to compare the contagiousness of respiratory *** applied the approach to SARS-CoV-1,SARS-CoV-2,merS,measles virus,adenovirus,rhinovirus,coxsackievirus,seasonal influenza virus and mycobacterium tuberculosis(TB)and compared quanta emission rate(er)estimates to literature *** calculated infection risk in a prototypical classroom and barracks to assess the relative ability of ventilation to mitigate airborne *** median standing and speaking erestimate for SARS-CoV-2(2.7 quanta h)is similar to active,untreated TB(3.1 quanta h),higher than seasonal influenza(0.17 quanta h-1),and lower than measles virus(15 quanta h).We calculated event reproduction numbers above 1 for SARS-CoV-2,measles virus,and untreated TB in both the classroom and barracks for an activity level of standing and speaking at low,medium and high ventilation rates of 2.3,6.6 and 14 L per second per person(L sp),*** predictive erestimates are consistent with the range of values reported over decades of *** congregate settings,current ventilation standards are unlikely to control the spread of viruses with upper quartile erqvalues above 10 quanta h,such as SARS-CoV-2,indicating the need for additional control measures.

关键词： SARS-CoV-2(COVID-19)airborne transmission Quanta emission rate Ventilation measles Influenza

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An in Vitro Comparison of Bonding Effectiveness of Different Adhesive Strategies on erbium:Yttrium-Alluminum-Garnet Laser Irradiated Dentin

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Open Journal of Stomatology 2016年第1期6卷 1-11页

作者： Daniele Scaminaci Russo Jacopo Buti luca Giachetti Department of Surgery and Translational medicine Unit of Dentistry University of Firenze Florence Italy School of Dentistry The University of Manchester Manchester UK Department of Surgery and Translational medicine Unit of Dentistry University of Firenze Florence Italy

Background: To date there is not a material considered ideal for the lased dentin. Objective: To compare the bond strength to human lased dentin of self-etch and etch-and-rinse adhesive systems, a self-adhesive resin composite and a glass-ionomer cement. methods: Forty human molars were sectioned to obtain a 2 mm-thick slab of mid-coronal dentin. The occlusal surface of each slab was polished by SiC paper (P600) for 10 s. Then an half part of dentin slabs was randomly selected for receiving treatment with 2.94 μm er:YAG laser (DEKA, Smart 2940D Plus) with 10 Hz at 100 mJ, pulse duration of 230 μs with contact tip. Dentin slabs were randomly divided into four groups (n = 10). Six conical frustum-shaped build-ups were constructed on the occlusal surface of each dentin slab using bonding agents (OptiBond Solo Plus Group 1;OptiBond All-in-one Group 2) combined with a resin composite (Premise Flow), self-adhesive resin composites (Vertise Flow Group 3) and a glass-ionomer cement (Ketac-Fil Group 4). Specimens were subjected to μSBS test. Data were analyzed by a mixed model and Tukey’s test. Results: measured bond strengths were (mean ± standard deviation): 20.8 ± 5.5 mPa (laser treatment) and 15.6 ± 4.5 mPa (SiC paper) for Group 1, 18.9 ± 5.3 mPa (laser treatment) and 14.0 ± 4.3 mPa (SiC paper) for Group 2, 7.9 ± 2.8 mPa (laser treatment) and 4.3 ± 2.2 mPa (SiC paper) for Group 3, 4.7 ± 1.9 mPa (laser treatment) and 2.6 ± 1.2 mPa (SiC paper) for Group 4. The inferential analysis showed that the dentin laser treatment significantly affected the bond strength within each individual group. On dentin treated with laser the bond strengths recorded for build-ups constructed with etch and rinse and self-etch adhesive systems were significantly higher than those recorded for build-ups constructed with self-adhesive resin composite and glass-ionomer cement (p milarly, on dentin treated with SiC paper the bond strengths recorded for build-ups constructed with etch and

关键词： Adhesion micro Shear Bond Strength Test Dentin Restorative materials

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Human Embryo Neuronal Culture <i>in Vitro</i>: A model to Study Cellular Physiology, Receptors, Power and Toxicity of Cytostatic Drugs for Human Use

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Neuroscience & medicine 2012年第3期3卷 321-326页

作者： Stabile mariano monaco Roberto Iuorio Tina Buoninfante luca marino Lucia Altieri Vincenzo Della Ragione Carlo masillo Francesco Anatomy Pathology Department Hospital “A. Cardarelli” Naples Italy Department of Gynecology and Obstetrics Hospital “Maria SS Addolorata” Eboli Italy Genetic Department Hospital “Ele-nad’ Aosta” Naples Italy ZigoteGenetic and Prenatal Diagnosis Centre Salerno Italy

Neural cells cultures from human embryo brain of 9° - 11°W gestational age have been used to study erα (Estrogens Receptor α) and to perform toxicity test for mitomycin C and methotrexate. Histochemical confirmation of cellular neuronal phenotype was based on histochemical evidence of NSE (Neuron Specific Enolase).The detection of erα in neuronal cells was performed with a rabbit monoclonal Antibody. erα was absent both on neurons grown in vitro and on tissue brain specimens. This finding is apparently in contrast with the positive immunoreactivity of erα and erβ reported by other Authors on foetal and adult CNS (Central Nervous System). The absence of nuclear erα on neurons in culture and in brain tissue specimens in our experiment is not in contrast with the relevant physiologic role of estrogens on nervous central system, but it could be correlated to the embryonic period of life and could represent a protection of male brain from an undue estrogens imprinting. The mitomycin C, alkylation agent, has shown in our experiment a major neurotoxic and cytostatic power in comparison with methotrexate. Our conclusion is that human embryo neuronal culture in vitro is a powerful instrument for physiology and human therapy for cancer and neurodegenerative diseases.

关键词： Human Embryo Neuronal Culture erα on Embryonic Brain mitomycin C Toxicity Test in Vitro methotrexate Toxicity Test in Vitro

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Tamoxifen Treatment in Correlation with Increased ET-1 Levels Is Associated with the Development of Breast Cancer metastases

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Journal of Cancer Therapy 2018年第5期9卷 438-463页

作者： melanie von Brandenstein Julia Straube Christina-maria Geisbusch luca Ozretic Yasemin Ural Verena Kirn Wolfram malter Jochen W.U.Fries Department of Urology University Hospital of KoelnKoelnGermany Department of molecular and Experimental Surgery University Hospital ErlangenErlangenGermany Department of Pediatric and Adolescent Psychiatry Psychsomatic and Psychotherapy University Clinic RTWH AachenGermany Department of Cellular Pathology Royal Free HospitalLondonUK Department of Urology University Hospital of KoelnKoelnGermany Department of Gynecology and Obstetrics University Hospital of KoelnKoelnGermany Department of Pathology University Hospital of KoelnKoelnGermany

Background: In breast cancer patients, a correlation between endothelin-1 (ET-1) and lymph node metastasis was found. While breast cancer with a positive er status can be treated with Tamoxifen, several studies describe increasing Tamoxifen resistance in patients. We analyzed the relationship between Tamoxifen, ET-1 overexpression, and er leading to Tamoxifen resistance. methods: Breast cancer cell lines were treated with Tamoxifen, ET-1, estrogen and combinations. Using qRT-PCR, immune-precipitation, Western blot, EmSA and immunohistology target gene expression and er complex partners were investigated. Human biopsies and mastectomy specimens were immunohistologically studied for Vimentin 3, and erβ. Results: Breast cancer cells stimulated with a combination of Tamoxifen and ET-1 downregulate erα, while upregulating intracellular ET-1, and erβ. Immunoprecipation of nuclear extracts with ET-1, erα or erβ agarose conjugated antibodies reveals a complex formation change replacing erα by erβ once Tamoxifen forms a complex with ET-1. erβand ET-1 migrate into the nucleus. ET-1 stimulation upregulates metastases promoting target genes (IL-6, Wnt11), including a novel one, Vimentin 3. Tissue analyses show Vim3 and erβ expression in metastases of erα positive breast cancer, and in erα negative biopsies/mastectomy specimens. Conclusion: We are the first to describe a complex consisting of Tamoxifen, erβ and ET-1, whose nuclear transmigration causes an overexpression of target genes. This mechanism may explain Tamoxifen resistance. Future pathologic analyses should include estrogen beta receptor status as well as the ET-1 expression. This concept presents a new treatment approach for individualized medicine in breast cancer patients with increased ET-1 levels.

关键词： Endothelin-1 Estrogen Estrogen Receptors Tamoxifen Vimentin3

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