Optoelectronic forces with quantum wells for cavity optomechanics in GaAs/AlAs semiconductor microcavities

Radiation pressure, electrostriction, and photothermal forces have been investigated to evidence backaction, nonlinearities, and quantum phenomena in cavity optomechanics. We show here through a detailed study of the relative intensity of the cavity mechanical modes observed when exciting with pulsed lasers close to the GaAs optical gap that optoelectronic forces involving real carrier excitation and deformation potential interaction are the strongest mechanism of light-to-sound transduction in semiconductor GaAs/AlAs distributed Bragg reflector optomechanical resonators. We demonstrate that the ultrafast spatial redistribution of the photoexcited carriers in microcavities with massive GaAs spacers leads to an enhanced coupling to the fundamental 20-GHz vertically polarized mechanical breathing mode. The carrier diffusion along the growth axis of the device can be enhanced by increasing the laser power, or limited by embedding GaAs quantum wells in the cavity spacer, a strategy used here to prove and engineer the optoelectronic forces in phonon generation with real carriers. The wavelength dependence of the observed phenomena provide further proof of the role of optoelectronic forces. The optical forces associated with the different intervening mechanisms and their relevance for dynamical backaction in optomechanics are evaluated using finite-element methods. The results presented open the path to the study of hitherto seldom investigated dynamical backaction in optomechanical solid-state resonators in the presence of optoelectronic forces.Fil: Villafañe, Viviana Daniela. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Sesin, Pablo Ezequiel. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Soubelet, Pedro Ignacio. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Anguiano, Sebastian. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Bruchhausen, Axel Emerico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Rozas, Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Gomez Carbonell, C.. Université Paris Sud; FranciaFil: Lemaître, A.. Université Paris Sud; FranciaFil: Fainstein, Alejandro. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentin

Brillouin Scattering in Hybrid Optophononic Bragg Micropillar Resonators at 300 GHz

We introduce a monolithic Brillouin generator based on a semiconductor micropillar cavity embedding a high frequency nanoacoustic resonator operating in the hundreds of GHz range. The concept of two nested resonators allows an independent design of the ultrahigh frequency Brillouin spectrum and of the optical device. We develop an optical free-space technique to characterize spontaneous Brillouin scattering in this monolithic device and propose a measurement protocol that maximizes the Brillouin generation efficiency in the presence of optically induced thermal effects. The compact and versatile Brillouin generator studied here could be readily integrated into fibered and on-chip architectures.Comment: 9 pages, 4 figure

What do HRD scholars and practitioners need to know about power, emotion and HRD?

International audienc

Bacteriemia secundaria a balanitis por pseudomona aeruginosa XDR en paciente con LLC con inmunosupresión severa prolongada

PB-071 Introducción: La neutropenia severa (7- 10 días) es indicación de profilaxis antibiótica en pacientes de alto riesgo para desarrollo de infección según guías de recomendación. En enfermedades con clonalidad linfoide como la leucemia linfática crónica (LLC), se añade frecuentemente el desarrollo de hipogamaglobulinemia, que produce afectación de la inmunidad innata y humoral, aumentando el riesgo infeccioso de base. Caso clínico: Paciente de 70 años con antecedentes de colicitis ulcerosa (CU) y LLC estadío Rai 4 Binet C desde mayo de 2017, con cadena pesada de las inmunoglobulinas y p53 normales, que recibió Ibrutinib durante 20 días en diciembre de 2017, suspendiéndose por múltiples complicaciones infecciosas: NAC, bacteriemia por E. Coli, gripe A y aspergilosis pulmonar invasiva. Ingresa en hematología en abril de 2018 por diarrea, disuria y balanitis prepucial de una semana de evolución. Presenta fiebre en contexto de neutropenia severa y prolongada, con posible foco infeccioso digestivo y/o urinario. Se inicia tratamiento antibiótico empírico y se continúa tratamiento antifúngico previo. Digestivo descarta que la diarrea sea secundaria a brote de CU. Presenta mejoría de cuadro diarreico con empeoramiento de balanitis, documentándose tándose aislamiento de P. aeruginosa XDR en orina y exudado uretral. Se realizó cambio de antibiótico a aztreonam y colistina según antibiograma recogido en Tabla 1. Durante la evolución, se reactiva infección por CMV y se decide inicio de valganciclovir sin evidencia de lesión orgánica o enfermedad por CMV. Se descarta infección fúngica invasiva activa durante la hospitalización. Debido a progresión clínica de adenopatías y aumento de hepatoesplenomegalia, además de neutropenia persistente, secundarios a infiltración por LLC; se decide inicio de quimioterapia con esquema R-Clorambucilo y reinicio de G-CSF (G-CSF inefectivo en ingresos previos). Se descarta transformación de hemopatía de base mediante biopsia de médula ósea. Se produce reducción importante de adenopatías axilares e inguinales con menor respuesta del conglomerado adenopático abdominal. ..

Mieloma múltiple extra-óseo, un caso con mala evolución ¿es lo usual?

PB-021 Introducción: El mieloma extramedular (MEM) se presenta al diagnóstico en 3-18% de los casos y otro 10-30% lo padecerá en algún en la evolución. Esta presentación de MM se asocia a morfología inmadura, Cg de alto riesgo, escape de cadenas ligeras, disminución en la expresión de CD56y aumento en la expresión de CD44 y CXCR4; con peor pronóstico pese a los avances en el tratamiento. Metodologia: Presentamos el caso de un paciente con diagnóstico de MM IgA K extra óseo con una evolución desfavorable. Diagnóstico inicial en Febrero 2014 ISS I, con plasmocitoma en V, VIII y IX arco costal, recibió tratamiento con VD por 6 ciclos alcanzando RC y posteriormente TASPE y consolidación con Velcade por 6 ciclos. Primer recaída en Ago 2016 con masa en pared torácica sin contacto óseo; escape a CLL K, tratamiento con VRD por 6 ciclos logrando RC y segundo TASPE y mantenimiento con R. Segunda recaída en Mayo 2018 con derrame pleural y ascitis maligna, tratamiento con DVd por 1 ciclo y progresión intratratamiento; cambio a Pomalidomida-Claritromicina- Dexametasona sin respuesta, desarrollo de insuficiencia respiratoria, fallo renal y hepático culminando en su fallecimiento en Agosto 2018. Conclusiones: Acorde a lo reportado, la supervivencia de la paciente fue menor a lo esperado por escalas de riesgo (ER) habitual (ISS) y el grado de respuesta alcanzado con el tratamiento, la SG fue de 54 meses con SLP 31 meses, la supervivencia después de la segunda recaída fue de 3 meses, similar a lo ya descrito (6 meses). Acorde a un estudio realizado por Weinstock el MEM solo 1, 32% de los MEM se manifestaron con enfermedad pleural y derrame, y 0, 62% en peritoneo y ascitis (como en el caso). Al igual que lo reportado, la enfermedad de la paciente presentó liberación de cadenas ligeras. Si bien existe evidencia y ..

Characterization of constricted fruit (ctf) Mutant Uncovers a Role for AtMYB117/LOF1 in Ovule and Fruit Development in Arabidopsis thaliana

Pistil and fruit morphogenesis is the result of a complex gene network that is not yet fully understood. A search for novel genes is needed to make a more comprehensive model of pistil and fruit development. Screening for mutants with alterations in fruit morphology generated by an activation tagging strategy resulted in the isolation of the ctf (constricted fruit) mutant. It is characterized by a) small and wrinkled fruits, with an enlarged replum, an amorphous structure of the septum and an irregular distribution of ovules and seeds; b) ectopic carpelloid structures in sepals bearing ovule-like structures and c) dwarf plants with curled rosette leaves. The overexpressed gene in ctf was AtMYB117, also named LOF1 (LATERAL ORGAN FUSION1). AtMYB117/LOF1 transcripts were localized in boundary regions of the vegetative shoot apical meristem and leaf primordia and in a group of cells in the adaxial base of petioles and bracts. Transcripts were also detected in the boundaries between each of the four floral whorls and during pistil development in the inner of the medial ridges, the placenta, the base of the ovule primordia, the epidermis of the developing septum and the outer cell layers of the ovule funiculi. Analysis of changes of expression of pistil-related genes in the ctf mutant showed an enhancement of SHATTERPROOF1 (SHP1) and SHP2 expression. All these results suggest that AtMYB117/LOF1 is recruited by a variety of developmental programs for the establishment of boundary regions, including the development of floral organs and the initiation of ovule outgrowth

Glomerulonefritis membranoproliferativa paraneoplásica en leucemia linfática crónica: a propósito de un caso

PB-070 Introducción: La leucemia linfática crónica (LLC) es una neoplasia hematológica con alta incidencia en la población general. Sin embargo, la incidencia de afectación extranodal o extramedular secundaria a procesos paraneoplásicos es rara. En las series de casos encontradas en la literatura, la incidencia de afectación sintomática a nivel genitourinario o ginecológico es inferior al 10%, pero en autopsias se ha encontrado infiltración asintomática hasta en un 90% de los casos. La glomerulonefritis membranoproliferativa (GNMP) es la afectación paraneoplásica más frecuentemente encontrada a nivel renal y se presenta generalmente con insuficiencia renal o síndrome nefrótico. Caso clínico: Paciente de 81 años con antecedentes de HTA, dislipemia, fibrilación auricular, HBP e hipoacusia crónica. Ingresa en Nefrología en septiembre de 2018 por insuficiencia renal progresiva desde una creatinina basal de 1.26 mg/dL hasta 2.54 mg/dL, asociado a microhematuria y proteinuria; sin proceso intercurrente ni exposición a nefrotóxicos. Se encuentra asintomático, sin hallazgos patológicos a la exploración física. Se objetiva proteinuria de 7.7 gramos en orina de 24 horas, proteinuria de Bence Jones negativa y hematuria persistente. Así mismo, se objetiva una linfocitosis de 5.8x103/microL. Se completa el estudio etiológico mediante biopsia renal, con el diagnóstico de GNMP. En las pruebas de inmunohistoquímica, se objetiva un infiltrado linfocítico en cápsula renal CD20 positivo, CD23 y CD5 focalmente positivos; compatible con infiltración por LLC. En la citometría de flujo de sangre periférica, se halla un 38, 1% de linfocitos B maduros, siendo un 96% elementos clonales con inmunofenotipo de LLC con coexpresión de CD20, CD19, CD23, CD200 y CD5. En la citogenética se obtiene trisomía del cromosoma 12. Presenta biología molecular no mutada para TP53 y VH. En la serie ósea no se objetivan imágenes osteolíticas. En diciembre de 2018, Nefrología inicia tratamiento con ..

Large Momentum Transfer Measurements of the Deuteron Elastic Structure Function A(Q^2) at Jefferson Laboratory

The deuteron elastic structure function A(Q^2) has been extracted in the Q^2 range 0.7 to 6.0 (GeV/c)^2 from cross section measurements of elastic electron-deuteron scattering in coincidence using the Hall A Facility of Jefferson Laboratory. The data are compared to theoretical models based on the impulse approximation with inclusion of meson-exchange currents, and to predictions of quark dimensional scaling and perturbative quantum chromodynamicsComment: Submitted to Physical Review Letter

Inferring the Regulatory Network of the miRNA-mediated Response to Biotic and Abiotic Stress in Melon

[EN] Background: MiRNAs have emerged as key regulators of stress response in plants, suggesting their potential as candidates for knock-in/out to improve stress tolerance in agricultural crops. Although diverse assays have been performed, systematic and detailed studies of miRNA expression and function during exposure to multiple environments in crops are limited. Results: Here, we present such pioneering analysis in melon plants in response to seven biotic and abiotic stress conditions. Deep-sequencing and computational approaches have identified twenty-four known miRNAs whose expression was significantly altered under at least one stress condition, observing that down-regulation was preponderant. Additionally, miRNA function was characterized by high scale degradome assays and quantitative RNA measurements over the intended target mRNAs, providing mechanistic insight. Clustering analysis provided evidence that eight miRNAs showed a broad response range under the stress conditions analyzed, whereas another eight miRNAs displayed a narrow response range. Transcription factors were predominantly targeted by stressresponsive miRNAs in melon. Furthermore, our results show that the miRNAs that are down-regulated upon stress predominantly have as targets genes that are known to participate in the stress response by the plant, whereas the miRNAs that are up-regulated control genes linked to development. Conclusion: Altogether, this high-resolution analysis of miRNA-target interactions, combining experimental and computational work, Illustrates the close interplay between miRNAs and the response to diverse environmental conditions, in melon.The authors thank Dr. A. Monforte for providing melon seeds and Dra. B. Pico (Cucurbits Group - COMAV) for providing melon seeds and Monosporascus isolate respectively. This work was supported by grants AGL2016-79825-R, BIO2014-61826-EXP (GG), and BFU2015-66894-P (GR) from the Spanish Ministry of Economy and Competitiveness (co-supported by FEDER). The funders had no role in the experiment design, data analysis, decision to publish, or preparation of the manuscript.Sanz-Carbonell, A.; Marques Romero, MC.; Bustamante-González, AJ.; Fares Riaño, MA.; Rodrigo Tarrega, G.; Gomez, GG. (2019). Inferring the Regulatory Network of the miRNA-mediated Response to Biotic and Abiotic Stress in Melon. BMC Plant Biology. 1-17. https://doi.org/10.1186/s12870-019-1679-0S117Zhang B. MicroRNAs: a new target for improving plant tolerance to abiotic stress. J Exp Bot. 2015;66:1749–61.Zhu JK. Abiotic stress signaling and responses in plants. Cell. 2016;167:313–24.Bielach A, Hrtyan M, Tognetti VB. Plants under stress: involvement of auxin and Cytokinin. Int J Mol Sci. 2017;4(18):7.Zarattini M, Forlani G. 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