Limites de tempo e temperatura para a aclimatação ao frio em canola.

A aclimatação ao frio pode ser um dos mecanismos das plantas utilizados para garantir a sobrevivência durante o inverno, em temperaturas abaixo de zero

Determination of the neutrino mass hierarchy in the regime of small matter effect

We point out a synergy between T-conjugated oscillation channels in the determination of the neutrino mass hierarchy with oscillation experiments with relatively short baselines (L < 700 km), where the matter effect is small. If information from all four oscillation channels $\nu_\mu\to\nu_e$, $\bar\nu_\mu\to\bar\nu_e$, $\nu_e\to\nu_\mu$ and $\bar\nu_e\to\bar\nu_\mu$ is available, a matter effect of few percent suffices to break the sign-degeneracy and allows to determine the neutrino mass hierarchy. The effect is discussed by analytical considerations of the relevant oscillation probabilities, and illustrated with numerical simulations of realistic experimental setups. Possible configurations where this method could be applied are the combination of a super beam experiment with a beta beam or a neutrino factory, or a (low energy) neutrino factory using a detector with muon and electron charge identification.Comment: 13 pages, 3 figure

Study on the frequency of caries and associated factors in type 1 diabetes mellitus

Subjects with diabetes mellitus (DM) are more prone to certain disturbances of oral cavity but there are controversies concerning caries. This cross-sectional study investigated the frequency of caries and associated factors, in a sample of population with or without type 1 DM, including non-diabetic (53 women, 31 men) and 30 diabetic subjects (19 women, 11 men) aged 17-28 years. Diagnosis of dental caries was based on the DMF-T index (D= decay; M= miss; F= fill; T= teeth); in addition, a plaque control record (PCR) was obtained. A preponderance of female sex was found within the groups studied but such proportions did not differ when comparing diabetic and non-diabetic groups. Mean ages were 21.0 ± 2.2 and 19.5 ± 1.8 years, respectively for subjects without and with DM (p< 0.05). Education level was higher in the non-diabetic group as well as the DMF-T index (10.5 ± 5.8 vs. 6.7 ± 5.7, p< 0.01). Linear regression analysis (n= 114) showed significant associations of DMF-T with age, sucrose intake, daily frequency of tooth brushing, of dental floss use, PCR and of visits to the dentist. By ANOVA model with age as a covariate the non-diabetic condition (p= 0.047), sucrose index and PCR (r²= 0.820) were independently associated with the DMF-T. In the diabetic-specific model, with only the diabetic subjects included and sucrose index as a covariate, DM duration, fundus abnormality and PCR were significantly associated with the presence of caries (r²= 0.816). The sample of type 1 diabetic subjects suggest that they are less prone to caries than non-diabetics, despite having a higher frequency of meals, less tooth brushing and dental floss use. We speculate that DM duration may contribute to the occurrence of caries and restricted sucrose consumption to lower frequency of caries in diabetic subjects.Indivíduos com diabetes mellitus (DM) são mais susceptíveis a doenças da cavidade bucal, havendo controvérsias quanto à cárie. Este estudo transversal investigou a freqüência de cárie e fatores associados em amostra portadora ou não de DM tipo 1, incluindo-se 84 jovens não-diabéticos (53F / 31M) e 30 diabéticos (19F / 11M) entre 17-28 anos. O diagnóstico de cárie baseou-se no índice de CPO-D (dentes C= cariados; P= perdidos; O= obturados); além deste, foi obtido registro de controle de placa (RCP). Nos grupos estudados houve predomínio do sexo feminino, embora estas proporções não tenham diferido entre os grupos diabético e não-diabético. As médias de idade foram de 21,0 ± 2,2 e 19,5 ± 1,8 anos, respectivamente para indivíduos sem e com DM (p< 0,05). A escolaridade foi mais elevada no grupo não-diabético, assim como o índice de CPO-D (10,5 ± 5,8 vs. 6,7 ± 5,7; p< 0,01). A análise de regressão simples (n= 114) mostrou associações significantes da CPO-D com idade, consumo de sacarose, número de escovações diárias, uso do fio dental, RCP e de visitas ao dentista. Em modelo de ANOVA, tendo a idade como co-variável, associaram-se significantemente à CPO-D a condição não-diabética, índice de sacarose e RCP (r²= 0,820). No modelo que incluiu apenas o grupo com DM, tendo o índice de sacarose como co-variável, o tempo de DM, anormalidade da fundoscopia e RCP associaram-se significantemente à cárie (r²= 0,816). A amostra de indivíduos diabéticos sugere que estes apresentam menos cáries que os não-diabéticos, apesar de realizarem maior número de refeições e menor uso de escovação e fio dental. Especula-se que a duração do DM possa contribuir para ocorrência de cárie e o consumo restrito de sacarose para menor freqüência de cárie em portadores de DM.Universidade Federal de São Paulo (UNIFESP) Departamento de Medicina PreventivaUSPUNIFESP, Depto. de Medicina PreventivaSciEL

LHC phenomenology of supersymmetric models beyond the MSSM

We discuss various phenomenological aspects of supersymmetric models beyond the MSSM. A particular focus is on models which can correctly explain neutrino data and the possiblities of LHC to identify the underlying scenario.Comment: Contribution to the 16th International Symposium on Particles, Strings and Cosmology (PASCOS 2010), Valencia (Spain), July 19-23, 201

Dynamical solution to the μ\mu problem at TeV scale

We introduce a new confining force (\mu-color) at TeV scale to dynamically generate a supersymmetry preserving mass scale which would replace the \mu parameter in the minimal supersymmetric standard model (MSSM). We discuss the Higgs phenomenology and also the pattern of soft supersymmetry breaking parameters allowing the correct electroweak symmetry breaking within the \mu-color model, which have quite distinctive features from the MSSM and also from other generalizations of the MSSM.Comment: 12 pages, REVte

New interactions: past and future experiments

In this talk I will review the present status and future perspectives of some popular extensions of the conventional three-neutrino oscillation scenario, from a purely phenomenological point of view. For concreteness I will focus only on three specific scenarios: non-standard neutrino interactions with matters, models with extra sterile neutrinos, and neutrino decay and decoherence.Comment: LaTeX file using jpconf class, 8 pages, 2 tables. Proceedings of the "XXIII International Conference on Neutrino Physics and Astrophysics" (Neutrino 08), Christchurch, New Zealand, May 25-31, 200

Theta-13 as a Probe of Mu-Tau symmetry for Leptons

Many experiments are being planned to measure the neutrino mixing parameter $\theta_{13}$ using reactor as well as accelerator neutrino beams. In this note, the theoretical significance of a high precision measurement of this parameter is discussed. It is emphasized that it will provide crucial information about different ways to understand the origin of large atmospheric neutrino mixing and move us closer towards determining the neutrino mass matrix. For instance if exact $\mu\leftrightarrow \tau$ symmetry in the neutrino mass matrix is assumed to be the reason for maximal $\nu_\mu-\nu_\tau$ mixing, one gets $\theta_{13}=0$. Whether $\theta_{13}\simeq \sqrt{\Delta m^2_{\odot}/\Delta m^2_A}$ or $\theta_{13}\simeq \Delta m^2_{\odot}/\Delta m^2_A$ can provide information about the way the $\mu\leftrightarrow \tau$ symmetry breaking manifests in the case of normal hierarchy. We also discuss the same question for inverted hierarchy as well as possible gauge theories with this symmetry.Comment: 12 pages; no figures; latex; more exact expressions given for some parameters and minor typos corrected; paper accepted for publication in JHE