Probing the Electronic Structure of Bilayer Graphene by Raman Scattering

The electronic structure of bilayer graphene is investigated from a resonant Raman study using different laser excitation energies. The values of the parameters of the Slonczewski-Weiss-McClure model for graphite are measured experimentally and some of them differ significantly from those reported previously for graphite, specially that associated with the difference of the effective mass of electrons and holes. The splitting of the two TO phonon branches in bilayer graphene is also obtained from the experimental data. Our results have implications for bilayer graphene electronic devices.Comment: 4 pages, 4 figure

Identification of Discolobium species indigenous to the Brazilian Pantanal ecosystem by microsatellite (SSRs) markers.

201

Influence of landscape context on the abundance of native bee pollinators in tomato crops in Central Brazil.

Made available in DSpace on 2018-08-08T00:50:12Z (GMT). No. of bitstreams: 1 Franceschinelli2017ArticleInfluenceOfLandscapeContextOnT.pdf: 1599822 bytes, checksum: 148c797a99c6db89f0eec1352bd2d3b6 (MD5) Previous issue date: 2017-11-07bitstream/item/181024/1/Franceschinelli2017-Article-InfluenceOfLandscapeContextOnT.pd

The mPower Study, Parkinson Disease Mobile Data Collected Using Researchkit

Current measures of health and disease are often insensitive, episodic, and subjective. Further, these measures generally are not designed to provide meaningful feedback to individuals. The impact of high-resolution activity data collected from mobile phones is only beginning to be explored. Here we present data from mPower, a clinical observational study about Parkinson disease conducted purely through an iPhone app interface. The study interrogated aspects of this movement disorder through surveys and frequent sensor-based recordings from participants with and without Parkinson disease. Benefitting from large enrollment and repeated measurements on many individuals, these data may help establish baseline variability of real-world activity measurement collected via mobile phones, and ultimately may lead to quantification of the ebbs-and-flows of Parkinson symptoms. App source code for these data collection modules are available through an open source license for use in studies of other conditions. We hope that releasing data contributed by engaged research participants will seed a new community of analysts working collaboratively on understanding mobile health data to advance human health

Caracterização fisiológica de rizóbios isolados de nódulos de raiz e caule de Discolobium spp

This study aimed to characterize rhizobia isolates of root and stem nodules of Discolobium spp., a native legume of Pantanal. Ten isolated rhizobia were randomly chosen from the culture collection of the Soil Microbiology Laboratory of Federal University of Mato Grosso. The parameters evaluated were: growth in YM medium with different salt concentrations (0%, 1.5% and 3%), different initial pH levels (6.8, 3.0 and 9.0), in two different temperatures (28 and 39 °C), and mucus production. The analyses showed  that all isolates were tolerant to salinity and to temperature of 39 °C. The alkaline pH was more harmful than acidic pH to the growth of isolates, which may be related to adaptation to acid soils.Com o objetivo de caracterizar rizóbios isolados de nódulos de raiz e caule de Discolobium spp, uma leguminosa nativa do Pantanal mato-grossense, foram escolhidos aleatoriamente 10 isolados da coleção de cultura do Laboratório de Microbiologia do solo da UFMT. Os parâmetros avaliados  foram crescimento em meio YM com diferentes concentrações salinas (0%, 1,5% e 3%), diferentes níveis de pH iniciais (6,8, 3,0 e 9,0), em duas temperaturas diferentes (28 e 39  °C)  e produção de muco. De acordo com as análises todos os isolados apresentaram  tolerância à salinidade e à temperatura de 39 °C. O pH alcalino foi mais prejudicial ao crescimento dos isolados que o pH ácido, o que pode estar relacionado à adaptação aos solos ácidos

Divergent responses of serum testosterone and cortisol in athlete men after a marathon race

Physical exercise alters homeostasis, as it requires prompt mobilization of metabolic sources. In this study, we measured serum testosterone (T) and cortisol (C) levels and the muscle-wastage enzymes CK, CKMB and LDH in 20 healthy male athletes (ages 25 to 40 years) in response to a marathon race (42.2 km). Venous blood samples were drawn in 3 different periods: (i) in the morning, 48 h before the competition (control), (ii) at the end of the race (end), and (iii) in the next morning, 20 h after the race (recovery). At the end, T was significantly lower (from 673 to 303 ng/dl) and C higher (from 20.3 to 42.5 µg/dl) as compared to the control period. At recovery, both were virtually identical to control levels. CK, CKMB and LDH were significantly higher at the end of the competition and even higher in the recovering period (except for CKMB), characterizing muscle wastage. CK and LDH disclosed a significant negative correlation with T (-0.412 and -0.546, respectively), whereas CKMB correlated positively with C (0.4521). We conclude that the inverse correlation observed between T and C levels, and the pattern of CK, CKMB and LDH increase, allow us to confirm that a marathon race may cause a marked physical stress, resulting in a distinct hormonal imbalance and severe cellular damage.O exercício físico altera a homeostase, pois requer rápida mobilização de fontes metabólicas. Neste estudo, analisamos a resposta dos níveis séricos de testosterona (T) e cortisol (C) e das enzimas de desgaste muscular CK, CKMB e LDH, em 20 atletas masculinos sadios (25 a 40 anos), participantes de uma maratona (42,2 km). Coletas de sangue venoso foram feitas em 3 períodos: (i) pela manhã, 48 h antes da maratona (controle), (ii) logo após o término da corrida (final) e (iii) na manhã seguinte, 20 h após a realização da prova (recuperação). Ao final, T estava significantemente mais baixa (de 673 para 303 ng/dl) e C mais elevado (de 20,3 para 42,5 µg/dl) que no período controle. Na recuperação, ambos praticamente retornaram aos níveis basais. CK, CKMB e LDH estavam significantemente mais elevadas ao final da corrida e mais ainda na recuperação (exceto a CKMB), caracterizando o desgaste muscular. Enquanto CK e LDH apresentaram significante correlação negativa com a T (-0,412 e -0,546, respectivamente), CKMB correlacionou-se positivamente com o C (0,4521). Concluímos que a correlação inversa entre T e C, e o comportamento das enzimas CK, CKMB e LDH, permite comprovar que uma corrida de maratona causa intenso stress físico, provocando desequilíbrio hormonal e lesão celular severa.Universidade Federal de São Paulo (UNIFESP) Departamento de Medicina Centro de Medicina da Atividade Física e do EsporteUNIFESP, Depto. de Medicina Centro de Medicina da Atividade Física e do EsporteSciEL