Search results for "INOS"

Searches for lepton number violation and resonances in K± → πμμ decays

2017

The NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles in 2003–2004. A new upper limit on the rate of the lepton number violating decay K±→π∓μ±μ± is reported: B(K±→π∓μ±μ±)<8.6×10−11 at 90% CL. Searches for two-body resonances X in K±→πμμ decays (such as heavy neutral leptons N4 and inflatons χ ) are also presented. In the absence of signals, upper limits are set on the products of branching fractions B(K±→μ±N4)B(N4→πμ) and B(K±→π±X)B(X→μ+μ−) for ranges of assumed resonance masses and lifetimes. The limits are in the (10−11,10−9) range for resonance lifetimes below 100 ps.

Mecanismos de percepción y de respuesta a bajas temperaturas en Saccharomyces cerevisiae

2014

A lo largo de los años, la levadura S. cerevisiae se ha convertido en organismo modelo tanto en la industria, como en el campo de la investigación básica, debido a sus características metabólicas y su fácil manipulación. Es conocido que, cuando la célula se enfrenta a una situación de estrés, debe modificar su fisiología para mantener la homeostasis celular. En el ámbito industrial, el aumento en la demanda de levaduras con características especiales, ha hecho patente la necesidad de nuevas cepas que se adecuen a los requerimientos y necesidades del consumidor. En esta línea, las estrategias de mejora y selección de cepas industriales se ven limitadas por el escaso conocimiento que disponem…

lhc phenomenology and neutrino physics in gut inspired susy models

2014

En la primera parte de la tesis investigamos un modelo supersimetrico con un mecanismo seesaw para explicar las masas de los neutrinos. Implementamos el modelo en SPheno que nos permitió calcular observables de LHC (Large Hardron Collider) como por ejemplo los ``Edge observables''. Con la ayuda de estos observables pudimos reconstruir el espectro de masa de una teoría como SUSY y compararlo con los resultados de los experimentos. Como no hemos observado SUSY en ningún experimento calculamos para diferentes parámetros de SUSY el espectro usando errores esperados para nuestra análisis. Para poder decidir si un modelo resulta verdadero necesitamos un valor independiente que nos permita cuantif…

Lierojen parittelumenestyksen yhteys sää- ja ympäristöoloihin, yksilötiheyteen ja yksilön kokoon

2011

Yksilön kelpoisuus riippuu jälkeläistuotosta, ja parittelumenestys on yksi jälkeläistuoton avaintekijöistä. Monien eläinlajiryhmien lisääntymistä on tutkittu laajasti sekä laboratorio-oloissa että luonnossa, mutta lierojen lisääntymismenestykseen vaikuttavia tekijöitä luonnonpopulaatioissa ei vielä juurikaan tunneta. Tämän tutkimuksen tavoitteena oli selvittää, miten kahden ekologialtaan erilaisen lierolajin parittelumenestys riippuu ympäristöoloista, yksilötiheydestä ja yksilön koosta. Tutkimuksessa käytettiin tietoja lieronäytteistä, jotka oli kerätty syksyinä 2004 ja 2005 viljelymailta eri puolilta Suomea. Spermatoforien esiintymistä yksilöillä käytettiin indikaattorina näytteenottoa ede…

Studio delle popolazioni di lieviti di interesse enologico sull’isola di linosa

2011

Temperature effects explain continental scale distribution of cyanobacterial toxins

2018

Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect…

LBNO-DEMO (WA105): a large demonstrator of the Liquid Argon double phase TPC

2016

LBNO-DEMO (WA105) is a large demonstrator of the double phase liquid argon TPC intended to develop and test the main elements of the GLACIER-based design for the purpose of scaling it up to the 10–50 kton size needed for Long Baseline Neutrino Oscillation studies. The crucial components of the design are: ultra-high argon purity in non-evacuable tank, long drifts, very high drift voltages, large area Micro Pattern Gas Detectors, and cold preamplifiers. The active volume of the demonstrator is 6×6×6 m3 (approximately 300t). WA105 is under construction at CERN and will be exposed to charged particle beams (0.5-20 GeV/c) in the North Area in 2018. The data will provide the necessary calibratio…

Seasonal Modulation of the $^7$Be Solar Neutrino Rate in Borexino

2017

We detected the seasonal modulation of the $^7$Be neutrino interaction rate with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. The period, amplitude, and phase of the observed time evolution of the signal are consistent with its solar origin, and the absence of an annual modulation is rejected at 99.99\% C.L. The data are analyzed using three methods: the sinusoidal fit, the Lomb-Scargle and the Empirical Mode Decomposition techniques, which all yield results in excellent agreement.

Biology of the sauropod dinosaurs: the evolution of gigantism

2010

The herbivorous sauropod dinosaurs of the Jurassic and Cretaceous periods were the largest terrestrial animals ever, surpassing the largest herbivorous mammals by an order of magnitude in body mass. Several evolutionary lineages among Sauropoda produced giants with body masses in excess of 50 metric tonnes by conservative estimates. With body mass increase driven by the selective advantages of large body size, animal lineages will increase in body size until they reach the limit determined by the interplay of bauplan, biology, and resource availability. There is no evidence, however, that resource availability and global physicochemical parameters were different enough in the Mesozoic to ha…

The ALHAMBRA survey: B -band luminosity function of quiescent and star-forming galaxies at 0.2 ≤  z  < 1 by PDF analysis

2016

[Aims]: Our goal is to study the evolution of the B-band luminosity function (LF) since z ∼ 1 using ALHAMBRA data. [Methods]: We used the photometric redshift and the I-band selection magnitude probability distribution functions (PDFs) of those ALHAMBRA galaxies with I ≤ 24 mag to compute the posterior LF. We statistically studied quiescent and star-forming galaxies using the template information encoded in the PDFs. The LF covariance matrix in redshift - magnitude - galaxy type space was computed, including the cosmic variance. That was estimated from the intrinsic dispersion of the LF measurements in the 48 ALHAMBRA sub-fields. The uncertainty due to the photometric redshift prior is also…