Últimos itens adicionados do Acervo: Biblioteca Digital da Produção Intelectual e Científica da Unicamp

A Biblioteca Digital da Produção Intelectual e Científica da Unicamp tem por objetivo reunir e disseminar a produção intelectual, acadêmica e cultural da universidade e preservar sua memória institucional, além de contribuir para ampliar a visibilidade da instituição e dos seus pesquisadores em âmbito nacional e internacional.

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Childhood enuresis is a risk factor for bladder dysfunction in adult life?

Levi D'Ancona, Carlos Arturo; Baena de Moraes Lopes, Maria Helena; Faleiros-Martins, Anna Carolina; Lucio, Adelia Correia; Campos, Renata Martins; Costa, Jose Vilton
Fonte: Wiley-Blackwell; Hoboken Publicador: Wiley-Blackwell; Hoboken
Tipo: Artigo de Revista Científica
ENG
Aims To verify the relationship between enuresis in childhood and the type of urinary incontinence in adults, considering the gender and age. Methods In this retrospective cohort study the database used contained the records of patients who had with urinary complaints and underwent urodynamic studies in the period from 1999 to 2008. A multinomial logistic regression model was adjusted for the type of UI. Results A total of 661 patient records were analyzed, 585 (88.5%) women and 76 (11.5%) men, with mean age 54 (SD?=?13.3). Patients with urge urinary incontinence (UUI) were compared to those with stress urinary incontinence (SUI) and the variables associated were the presence of enuresis in childhood (OR?=?2.37, IC: 1.433.92) and age >50 years (OR?=?2.64, CI: 1.684.15). Comparing patients with mixed urinary incontinence (MUI) and SUI, the presence of enuresis was also associated ((OR?=?1.77, CI: 1.152.73) and the age of more than 50 years (OR?=?1.71, CI: 1.192.44). For both categories of urinary incontinence, the variable sex was not associated. Conclusions Individuals with MUI and UUI in adult life were more likely to have a history of enuresis in childhood than those with SUI. Neurourol. Urodynam. 31:634636, 2012. (C) 2012 Wiley Periodicals...

Initial experience at a university teaching hospital from using telemedicine to promote education through video conferencing

Tavares Pereira, Bruno Monteiro; Araujo Calderan, Thiago Rodrigues; Nolasco da Silva, Marcos Tadeu; da Silva, Antonio Carlos; Marttos, Antonio Carlos, Jr.; Fraga, Gustavo Pereira
Fonte: Associacao Paulista Medicina; Sao Paulo Publicador: Associacao Paulista Medicina; Sao Paulo
Tipo: Artigo de Revista Científica
ENG
CONTEXT AND OBJECTIVE: Telehealth and telemedicine services are advancing rapidly, with an increasing spectrum of information and communication technologies that can be applied broadly to the population's health, and to medical education. The aim here was to report our institution's experience from 100 videoconferencing meetings between five different countries in the Americas over a one-year period. DESIGN AND SETTING: Retrospective study at Universidade Estadual de Campinas. METHODS: Through a Microsoft Excel database, all conferences in all specialties held at our institution from September 2009 to August 2010 were analyzed retrospectively. RESULTS: A total of 647 students, physicians and professors participated in telemedicine meetings. A monthly mean of 8.3 (+/- 4.3) teleconferences were held over the analysis period. Excluding holidays and the month of inaugurating the telemedicine theatre, our teleconference rate reached a mean of 10.3 (+/- 2.7), or two teleconferences a week, on average. Trauma surgery and meetings on patient safety were by far the most common subjects discussed in our teleconference meetings, accounting for 22% and 21% of the total calls. CONCLUSION: Our experience with telemedicine meetings has increased students' interest; helped our institution to follow and discuss protocols that are already accepted worldwide; and stimulated professors to promote telemedicine-related research in their own specialties and keep up-to-date. These high-technology meetings have shortened distances in our vast country...

Relationship between function, strength and electromyography of upper extremities of persons with tetraplegia

de Vargas Ferreira, V. M.; Varoto, R.; Azevedo Cacho, E. W.; Cliquet, A., Jr.
Fonte: Nature Publishing Group; London Publicador: Nature Publishing Group; London
Tipo: Artigo de Revista Científica
ENG
Study design: Cross-sectional. Objective: To analyze the relationships between functional tests, arm strength and root mean square of surface electromyography (EMG). Setting: Sao Paulo, Brazil. Methods: Twenty-four individuals with chronic tetraplegia participated. Upper extremity motor score (UEMS), functional independence measure (FIM) motor score, spinal cord independence measure III and capabilities of upper extremity (CUE) were performed. Muscle strength of the right elbow flexors-extensors was assessed using dynamometry and manual muscle test (MMT) and EMG of right biceps and triceps brachii were performed. Spearman's rank correlation coefficients and Mann-Whitney's U-test were used. Results: Functional tests and UEMS correlated strongly among them. UEMS highly correlated with triceps dynamometry and EMG. The dynamometry showed a very high correlation with MMT on the extensor group and a moderate correlation with flexor group. Triceps EMG showed moderate correlation with FIM and CUE. High correlations between triceps EMG and elbow extensors dynamometry and MMT were observed. A significant better performance on functional tests was observed on lower ASIA motor levels. The low-tetraplegia group showed a significant higher score on triceps EMG and dynamometry. Conclusion: Arm strength and EMG seem to be related to functional capabilities and independence in chronic tetraplegia. Spinal Cord (2012) 50...

Diastolic function parameters are improved by the addition of simvastatin to enalapril-based treatment in hypertensive individuals

Beck, Adenalva L. S.; Otto, Maria E. B.; Avila, Luciana B. O. D.; Netto, Fernando M.; Armendaris, Marinez K.; Sposito, Andrei C.
Fonte: Elsevier; Clare Publicador: Elsevier; Clare
Tipo: Artigo de Revista Científica
ENG
Objective: Diastolic dysfunction (DD) is a frequent condition in hypertensive patients whose presence increases mortality and whose treatment remains unclear. The aim of this study was to investigate in a prospective, double-blinded, placebo-controlled randomized design the additive effect of simvastatin on DD in enalapril-treated hypertensive patients with average cholesterol levels. Methods: Hypertensive patients with DD and LDL-cholesterol <160 mg/dL underwent a run-in phase to achieve a systolic blood pressure (SBP) <135 mmHg and diastolic blood pressure (DBP) <85 mmHg with enalapril. Hydrochlorothiazide was added when need to achieve blood pressure control. Four weeks after reaching the optimum anti-hypertensive regimen patients were randomized to receive 80 mg simvastatin (n = 27) or placebo (n = 28) for a period of 20 weeks. Echocardiograms were performed before and after treatment with measurement of maximum left atrial volume (LAV), conventional and tissue Doppler velocities in early diastole (E, e') and late diastole (A, a'). Results: After 20 weeks, the simvastatin group presented reduction in SBP (-4 +/- 2 mmHg, p = 0.02), increase in E/A ratio (1.0 +/- 0.05 to 1.2 +/- 0.06, p = 0.03) and decrease of LAV indexed to body surface area (24.5 +/- 0.9 to 21.1 +/- 0.8 ml/m(2)...

Gender characterization in a large series of Brazilian patients with spondyloarthritis

de Carvalho, Hellen M. S.; Bortoluzzo, Adriana B.; Goncalves, Celio R.; Braga da Silva, Jose Antonio; Ximenes, Antonio Carlos; Bertolo, Manoel B.; Ribeiro, Sandra L. E.; Keiserman, Mauro; Menin, Rita; Skare, Thelma L.; Carneiro, Sueli; Azevedo, Valderilio
Fonte: Springer; London Publicador: Springer; London
Tipo: Artigo de Revista Científica
ENG
An increasing number of women have been diagnosed with spondyloarthritis (SpA) in recent decades. While a few studies have analyzed gender as a prognostic factor of the disease, no studies have addressed this matter with a large number of patients in South America, which is a peculiar region due to its genetic heterogeneity. The aim of the present study was to analyze the influence of gender on disease patterns in a large cohort of Brazilian patients with SpA. A prospective study was carried out involving 1,505 patients [1,090 males (72.4%) and 415 females (27.6%)] classified as SpA according to the European Spondyloarthropaties Study Group criteria who attended at 29 reference centers for rheumatology in Brazil. Clinical and demographic variables were recorded and the following disease indices were administered: Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI), Bath Ankylosing Spondylitis Radiologic Index (BASRI), Maastricht Ankylosing Spondylitis Enthesitis Score (MASES), and Ankylosing Spondylitis Quality of Life (ASQoL). Ankylosing spondylitis (AS) was the most frequent disease in the group (65.4%), followed by psoriatic arthritis (18.4%), undifferentiated SpA (6.7%)...

Seizures in Primary Antiphospholipid Syndrome: The Relevance of Smoking to Stroke

de Carvalho, Jozelio Freire; Pasoto, Sandra Gofinet; Appenzeller, Simone
Fonte: Hindawi Publishing Corporation; New York Publicador: Hindawi Publishing Corporation; New York
Tipo: Artigo de Revista Científica
ENG
Objectives. To evaluate the frequency of seizures in primary antiphospholipid syndrome (PAPS) and their possible clinical and laboratory associations. Methods. Eighty-eight PAPS patients (Sydney's criteria) were analyzed by a standard interview, physical examination and review of medical charts. Risk factors for seizures, clinical manifestations, associated comorbidities, and antiphospholipid antibodies were evaluated. Results. Nine (10.2%) patients with seizures were identified, 77.8% had convulsions onset after PAPS diagnosis. Mean age, gender, and race were comparable in groups with or without seizures. Interestingly, a higher frequency of current smoking (44.4 versus 10.1%, P = 0.019) was observed in the first group. Stroke, Sneddon's syndrome, and livedo reticularis were more frequent in PAPS patients with seizures than those without seizures, although not statistically significant (P > 0.05). Comparison between patients with seizures onset after PAPS diagnosis (n = 7) and those without convulsions (n = 79) demonstrated a higher frequency of current smoking (42.9 versus 10%, P = 0.042) and stroke in the first group (71.4 versus 30.4%, P = 0.041). Regression analysis confirmed that smoking (P = 0.030) and stroke (P = 0.042) were independently associated to seizures. Conclusion. About 10.2% of PAPS patients had convulsions...

Seasonality Role on the Phenolics from Cultivated Baccharis dracunculifolia

SOUSA, Joao Paulo B. de; LEITE, Mateus F.; JORGE, Renata F.; RESENDE, Dimas O.; SILVA FILHO, Ademar A. da; FURTADO, Niege A. J. C.; SOARES, Ademilson E. E.; SPADARO, Augusto C. C.; MAGALHAES, Pedro Melillo de; BASTOS, Jairo K.
Fonte: HINDAWI PUBLISHING CORPORATION Publicador: HINDAWI PUBLISHING CORPORATION
Tipo: Artigo de Revista Científica
ENG
Baccharis dracunculifolia is the source of Brazilian green propolis (BGP). Considering the broad spectrum of biological activities attributed to green proplis, B. dracunculifolia has a great potential for the development of new cosmetic and pharmaceutical products. In this work, the cultivation of 10 different populations of native B. dracunculifolia had been undertaken aiming to determine the role of seasonality on its phenolic compounds. For this purpose, fruits of this plant were collected from populations of 10 different regions, and 100 individuals of each population were cultivated in an experimental area of 1800 m(2). With respect to cultivation, the yields of dry plant, essential oil and crude extract were measured monthly resulting in mean values of 399 +/- 80 g, 0.6 +/- 0.1% and 20 +/- 4%, respectively. The HPLC analysis allowed detecting seven phenolic compounds: caffeic acid, ferulic acid, aromadendrin-4'-methyl ether (AME), isosakuranetin, artepillin C, baccharin and 2-dimethyl-6-carboxyethenyl-2H-1-benzopyran acid, which were the major ones throughout the 1-year monthly analysis. Caffeic acid was detected in all cultivated populations with mean of 4.0%. AME displayed the wide variation in relation to other compounds showing means values of 0.65 +/- 0.13% at last quarter. Isosakuranetin and artepillin C showed increasing concentrations with values between 0% and 1.4% and 0% and 1.09%...

Structural basis of GC-1 selectivity for thyroid hormone receptor isoforms

BLEICHER, Lucas; APARICIO, Ricardo; NUNES, Fabio M.; MARTINEZ, Leandro; DIAS, Sandra M. Gomes; FIGUEIRA, Ana Carolina Migliorini; SANTOS, Maria Auxiliadora Morim; VENTURELLI, Walter H.; SILVA, Rosangela da; DONATE, Paulo Marcos; NEVES, Francisco A. R.; SI
Fonte: BIOMED CENTRAL LTD Publicador: BIOMED CENTRAL LTD
Tipo: Artigo de Revista Científica
ENG
Background: Thyroid receptors, TRa and TR beta, are involved in important physiological functions such as metabolism, cholesterol level and heart activities. Whereas metabolism increase and cholesterol level lowering could be achieved by TR beta isoform activation, TRa activation affects heart rates. Therefore, beta-selective thyromimetics have been developed as promising drug-candidates for treatment of obesity and elevated cholesterol level. GC-1 [ 3,5-dimethyl-4-(4'-hydroxy- 3'-isopropylbenzyl)-phenoxy acetic acid] has ability to lower LDL cholesterol with 600-to 1400-fold more potency and approximately two-to threefold more efficacy than atorvastatin (Lipitor(C)) in studies in rats, mice and monkeys. Results: To investigate GC-1 specificity, we solved crystal structures and performed molecular dynamics simulations of both isoforms complexed with GC-1. Crystal structures reveal that, in TRa Arg228 is observed in multiple conformations, an effect triggered by the differences in the interactions between GC-1 and Ser277 or the corresponding asparagine (Asn331) of TR beta. The corresponding Arg282 of TR beta is observed in only one single stable conformation, interacting effectively with the ligand. Molecular dynamics support this model: our simulations show that the multiple conformations can be observed for the Arg228 in TR alpha...

Sugarcane genes associated with sucrose content

PAPINI-TERZI, Flavia S.; ROCHA, Flavia R.; VENCIO, Ricardo Z. N.; FELIX, Juliana M.; BRANCO, Diana S.; WACLAWOVSKY, Alessandro J.; BEM, Luiz E. V. Del; LEMBKE, Carolina G.; COSTA, Maximiller D. L.; NISHIYAMA JR., Milton Y.; VICENTINI, Renato; VINCENTZ, Mi
Fonte: BIOMED CENTRAL LTD Publicador: BIOMED CENTRAL LTD
Tipo: Artigo de Revista Científica
ENG
Background -: Sucrose content is a highly desirable trait in sugarcane as the worldwide demand for cost-effective biofuels surges. Sugarcane cultivars differ in their capacity to accumulate sucrose and breeding programs routinely perform crosses to identify genotypes able to produce more sucrose. Sucrose content in the mature internodes reach around 20% of the culms dry weight. Genotypes in the populations reflect their genetic program and may display contrasting growth, development, and physiology, all of which affect carbohydrate metabolism. Few studies have profiled gene expression related to sugarcane's sugar content. The identification of signal transduction components and transcription factors that might regulate sugar accumulation is highly desirable if we are to improve this characteristic of sugarcane plants. Results -: We have evaluated thirty genotypes that have different Brix (sugar) levels and identified genes differentially expressed in internodes using cDNA microarrays. These genes were compared to existing gene expression data for sugarcane plants subjected to diverse stress and hormone treatments. The comparisons revealed a strong overlap between the drought and sucrose-content datasets and a limited overlap with ABA signaling. Genes associated with sucrose content were extensively validated by qRT-PCR...

Spin alignment measurements of the K*(0)(892) and phi(1020) vector mesons in heavy ion collisions at root S(NN)=200 GeV

ABELEV, B. I.; AGGARWAL, M. M.; AHAMMED, Z.; ANDERSON, B. D.; ARKHIPKIN, D.; AVERICHEV, G. S.; BAI, Y.; BALEWSKI, J.; BARANNIKOVA, O.; BARNBY, L. S.; BAUDOT, J.; BAUMGART, S.; BEAVIS, D. R.; BELLWIED, R.; BENEDOSSO, F.; BETTS, R. R.; BHARDWAJ, S.; BHASIN,
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
We present the first spin alignment measurements for the K*(0)(892) and phi(1020) vector mesons produced at midrapidity with transverse momenta up to 5 GeV/c at root s(NN) = 200 GeV at RHIC. The diagonal spin-density matrix elements with respect to the reaction plane in Au+Au collisions are rho(00) = 0.32 +/- 0.04 (stat) +/- 0.09 (syst) for the K*(0) (0.8 < p(T) < 5.0 GeV/c) and rho(00) = 0.34 +/- 0.02 (stat) +/- 0.03 (syst) for the phi (0.4 < p(T) < 5.0 GeV/c) and are constant with transverse momentum and collision centrality. The data are consistent with the unpolarized expectation of 1/3 and thus no evidence is found for the transfer of the orbital angular momentum of the colliding system to the vector-meson spins. Spin alignments for K(*0) and phi in Au+Au collisions were also measured with respect to the particle's production plane. The phi result, rho(00) = 0.41 +/- 0.02 (stat) +/- 0.04 (syst), is consistent with that in p+p collisions, rho(00) = 0.39 +/- 0.03 (stat) +/- 0.06 (syst), also measured in this work. The measurements thus constrain the possible size of polarization phenomena in the production dynamics of vector mesons.

Proteome analysis of schizophrenia patients Wernicke's area reveals an energy metabolism dysregulation

MARTINS-DE-SOUZA, Daniel; GATTAZ, Wagner F.; SCHMITT, Andrea; NOVELLO, Jose C.; MARANGONI, Sergio; TURCK, Christoph W.; DIAS-NETO, Emmanuel
Fonte: BIOMED CENTRAL LTD Publicador: BIOMED CENTRAL LTD
Tipo: Artigo de Revista Científica
ENG
Background: Schizophrenia is likely to be a consequence of DNA alterations that, together with environmental factors, will lead to protein expression differences and the ultimate establishment of the illness. The superior temporal gyrus is implicated in schizophrenia and executes functions such as the processing of speech, language skills and sound processing. Methods: We performed an individual comparative proteome analysis using two-dimensional gel electrophoresis of 9 schizophrenia and 6 healthy control patients' left posterior superior temporal gyrus (Wernicke's area - BA22p) identifying by mass spectrometry several protein expression alterations that could be related to the disease. Results: Our analysis revealed 11 downregulated and 14 upregulated proteins, most of them related to energy metabolism. Whereas many of the identified proteins have been previously implicated in schizophrenia, such as fructose-bisphosphate aldolase C, creatine kinase and neuron-specific enolase, new putative disease markers were also identified such as dihydrolipoyl dehydrogenase, tropomyosin 3, breast cancer metastasis-suppressor 1, heterogeneous nuclear ribonucleoproteins C1/C2 and phosphate carrier protein, mitochondrial precursor. Besides, the differential expression of peroxiredoxin 6 (PRDX6) and glial fibrillary acidic protein (GFAP) were confirmed by western blot in schizophrenia prefrontal cortex. Conclusion: Our data supports a dysregulation of energy metabolism in schizophrenia as well as suggests new markers that may contribute to a better understanding of this complex disease.; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Cytomegalovirus frequency in neonatal intrahepatic cholestasis determined by serology, histology, immunohistochemistry and PCR

BELLOMO-BRANDAO, Maria Angela; ANDRADE, Paula D.; COSTA, Sandra C. B.; ESCANHOELA, Cecilia A. F.; VASSALLO, Jose; PORTA, Gilda; TOMMASO, Adriana M. A. De; HESSEL, Gabriel
Fonte: W J G PRESS Publicador: W J G PRESS
Tipo: Artigo de Revista Científica
ENG
AIM: To determine cytomegalovirus (CMV) frequency in neonatal intrahepatic cholestasis by serology, histological revision (searching for cytomegalic cells), immunohistochemistry, and polymerase chain reaction (PCR), and to verify the relationships among these methods. METHODS: The study comprised 101 non-consecutive infants submitted for hepatic biopsy between March 1982 and December 2005. Serological results were obtained from the patient's files and the other methods were performed on paraffin-embedded liver samples from hepatic biopsies. The following statistical measures were calculated: frequency, sensibility, specific positive predictive value, negative predictive value, and accuracy. RESULTS: The frequencies of positive results were as follows: serology, 7/64 (11%); histological revision, 0/84; immunohistochemistry, 1/44 (2%), and PCR, 6/77 (8%). Only one patient had positive immunohistochemical findings and a positive PCR. The following statistical measures were calculated between PCR and serology: sensitivity, 33.3%; specificity, 88.89%; positive predictive value, 28.57%; negative predictive value, 90.91%; and accuracy, 82.35%. CONCLUSION: The frequency of positive CMV varied among the tests. Serology presented the highest positive frequency. When compared to PCR...

Analysis of the histologic features in the differential diagnosis of intrahepatic neonatal cholestasis

BELLOMO-BRANDAO, Maria Angela; ESCANHOELA, Cecilia A. F.; MEIRELLES, Luciana R.; PORTA, Gilda; HESSEL, Gabriel
Fonte: W J G PRESS Publicador: W J G PRESS
Tipo: Artigo de Revista Científica
ENG
AIM: To compare the histologic features of the liver in intrahepatic neonatal cholestasis (IHNC) with infectious, genetic-endocrine-metabolic, and idiopathic etiologies. METHODS: Liver biopsies from 86 infants with IHNC were evaluated. The inclusion criteria consisted of jaundice beginning at 3 mo of age and a hepatic biopsy during the 1st year of life. The following histologic features were evaluated: cholestasis, eosinophilia, giant cells, erythropoiesis, siderosis, portal fibrosis, and the presence of a septum. RESULTS: Based on the diagnosis, patients were classified into three groups: group 1 (infectious; n = 18), group 2 (genetic-endocrine-metabolic; n = 18), and group 3 (idiopathic; n = 50). There were no significant differences with respect to the following variables: cholestasis, eosinophilia, giant cells, siderosis, portal fibrosis, and presence of a septum. A significant difference was observed with respect to erythropoiesis, which was more severe in group 1 (Fisher's exact test, P = 0.016). CONCLUSION: A significant difference was observed in IHNC of infectious etiology, in which erythropoiesis was more severe than that in genetic-endocrine-metabolic and idiopathic etiologies, whereas there were no significant differences among cholestasis...

In utero protein restriction causes growth delay and alters sperm parameters in adult male rats

TOLEDO, Fabiola C.; PEROBELLI, Juliana E.; PEDROSA, Flavia P. C.; ANSELMO-FRANCI, Janete A.; KEMPINAS, Wilma D. G.
Fonte: BIOMED CENTRAL LTD Publicador: BIOMED CENTRAL LTD
Tipo: Artigo de Revista Científica
ENG
Background: Recent studies have supported the concept of ""fetal programming"" which suggests that during the intrauterine development the fetus may be programmed to develop diseases in adulthood. The possible effects of in utero protein restriction on sexual development of rat male offspring were evaluated in the present study. Methods: Pregnant Wistar rats were divided into two experimental groups: one group treated with standard chow (SC, n = 8, 17% protein) and the other group treated with hypoproteic chow (HC, n = 10, 6% protein) throughout gestation. After gestation the two experimental groups received standard chow. To evaluate the possible late reproductive effects of in utero protein restriction, the male offspring of both groups were assessed at different phases of sexual development: prepubertal (30 days old); peripubertal (60 days old); adult (90 days old). Student's t test and Mann-Whitney test were utilized. Differences were considered significant when p < 0.05. Results: We found that in utero protein restriction reduced the body weight of male pups on the first postnatal day and during the different sexual development phases (prepubertal, peripubertal and adult). During adulthood, Sertoli cell number, sperm motility and sperm counts in the testis and epididymal cauda were also reduced in HC. Furthermore...

The Missing Part of Seed Dispersal Networks: Structure and Robustness of Bat-Fruit Interactions

MELLO, Marco Aurelio Ribeiro; MARQUITTI, Flavia Maria Darcie; GUIMARAES JR., Paulo Roberto; KALKO, Elisabeth Klara Viktoria; JORDANO, Pedro; AGUIAR, Marcus Aloizio Martinez de
Fonte: PUBLIC LIBRARY SCIENCE Publicador: PUBLIC LIBRARY SCIENCE
Tipo: Artigo de Revista Científica
ENG
Mutualistic networks are crucial to the maintenance of ecosystem services. Unfortunately, what we know about seed dispersal networks is based only on bird-fruit interactions. Therefore, we aimed at filling part of this gap by investigating bat-fruit networks. It is known from population studies that: (i) some bat species depend more on fruits than others, and (ii) that some specialized frugivorous bats prefer particular plant genera. We tested whether those preferences affected the structure and robustness of the whole network and the functional roles of species. Nine bat-fruit datasets from the literature were analyzed and all networks showed lower complementary specialization (H(2)' = 0.3760.10, mean 6 SD) and similar nestedness (NODF = 0.5660.12) than pollination networks. All networks were modular (M=0.32 +/- 0.07), and had on average four cohesive subgroups (modules) of tightly connected bats and plants. The composition of those modules followed the genus-genus associations observed at population level (Artibeus-Ficus, Carollia-Piper, and Sturnira-Solanum), although a few of those plant genera were dispersed also by other bats. Bat-fruit networks showed high robustness to simulated cumulative removals of both bats (R = 0.55 +/- 0.10) and plants (R = 0.68 +/- 0.09). Primary frugivores interacted with a larger proportion of the plants available and also occupied more central positions; furthermore...

Observation of the suppression of the flux of cosmic rays above 4x10(19) eV

ABRAHAM, J.; ABREU, P.; AGLIETTA, M.; AGUIRRE, C.; ALLARD, D.; ALLEKOTTE, I.; ALLEN, J.; ALLISON, P.; ALVAREZ-MUNIZ, J.; AMBROSIO, M.; ANCHORDOQUI, L.; ANDRINGA, S.; ANZALONE, A.; ARAMO, C.; ARGIRO, S.; ARISAKA, K.; ARMENGAUD, E.; ARNEODO, F.; ARQUEROS, F
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
The energy spectrum of cosmic rays above 2.5 x 10(18) eV, derived from 20 000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional to E(-gamma), at energies between 4 x 10(18) eV and 4 x 10(19) eV is 2.69 +/- 0.02(stat) +/- 0.06(syst), steepening to 4.2 +/- 0.4(stat) +/- 0: 06 (syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Upper limit on the diffuse flux of ultrahigh energy tau neutrinos from the Pierre Auger Observatory

ABRAHAM, J.; ABREU, P.; AGLIETTA, M.; AGUIRRE, C.; ALLARD, D.; ALLEKOTTE, I.; ALLEN, J.; ALLISON, P.; ALVAREZ-MUNIZ, J.; AMBROSIO, M.; ANCHORDOQUI, L.; ANDRINGA, S.; ANZALONE, A.; ARAMO, C.; ARGIRO, S.; ARISAKA, K.; ARMENGAUD, E.; ARNEODO, F.; ARQUEROS, F
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth's crust. Tau leptons from nu(tau) charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of nu(tau) at EeV energies. Assuming an E(nu)(-2) differential energy spectrum the limit set at 90% C. L. is E(nu)(2)dN(nu tau)/dE(nu) < 1: 3 x 10(-7) GeV cm(-2) s(-1) sr(-1) in the energy range 2 x 10(17) eV< E(nu) < 2 x 10(19) eV.

Precise measurements of direct CP violation, CPT symmetry, and other parameters in the neutral kaon system

ABOUZAID, E.; ARENTON, M.; BARKER, A. R.; BARRIO, M.; BELLANTONI, L.; BLUCHER, E.; BOCK, G. J.; BOWN, C.; CHEU, E.; COLEMAN, R.; CORCORAN, M. D.; COX, B.; ERWIN, A. R.; ESCOBAR, C. O.; GLAZOV, A.; GOLOSSANOV, A.; GOMES, R. A.; GOUFFON, P.; GRAHAM, J.; HAM
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
We present precise tests of CP and CPT symmetry based on the full data set of K -> pi pi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This data set contains 16 x 10(6) K -> pi(0)pi(0) and 69 x 10(6) K -> pi(+)pi(-) decays. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 +/- 2.1) x 10(-4). We find the K(L) -> K(S) mass difference Delta m = (5270 +/- 12) x 10(6) (h) over tilde s(-1) and the K(S) lifetime tau(S) = (89.62 +/- 0.05) x 10(-12) s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter epsilon and the superweak phase: phi(epsilon) - phi(SW) =(0.40 +/- 0.56)degrees. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K -> pi(+)pi(-) (phi(+-)) and for K -> pi(0)pi(0) (phi(00)): Delta phi = (0.30 +/- 0.35)degrees. From these phase measurements, we place a limit on the mass difference between K(0) and (K) over bar (0): Delta M < 4.8 x 10(-19) GeV/c(2) at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Multimode Vibrational Couplings in Resonant Positron Annihilation

SANCHEZ, Sergio d'A.; LIMA, Marco A. P.; VARELLA, Marcio T. do N.
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
The mechanisms for multimode vibrational couplings in resonant positron annihilation are not well understood. We show that these resonances can arise from positron-induced distortions of the potential energy surface (target response to the positron field). Though these distortions can transfer energy into single- and multiquantum vibrations, they have so far been disregarded as a pathway to resonant annihilation. We also compare the existing annihilation theories and show that the currently accepted model can be cast as a special case of the Feshbach annihilation theory.; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Magnetic resonant x-ray diffraction study of europium telluride

DIAZ, B.; GRANADO, E.; ABRAMOF, E.; RAPPL, P. H. O.; CHITTA, V. A.; HENRIQUES, A. B.
Fonte: AMER PHYSICAL SOC Publicador: AMER PHYSICAL SOC
Tipo: Artigo de Revista Científica
ENG
Here we use magnetic resonant x-ray diffraction to study the magnetic order in a 1.5 mu m EuTe film grown on (111) BaF(2) by molecular-beam epitaxy. At Eu L(II) and L(III) absorption edges, a resonant enhancement of more than two orders was observed for the sigma ->pi(') diffracted intensity at half-order reciprocal-lattice points, consistent with the magnetic character of the scattering. We studied the evolution of the (1/21/21/2) magnetic reflection with temperature. When heating toward the Neel temperature (T(N)), the integrated intensity decreased monotonously and showed no hysteresis upon cooling again, indicating a second-order phase transition. A power-law fit to the magnetization versus temperature curve yielded T(N)=9.99(1) K and a critical exponent beta=0.36(1), which agrees with the renormalization theory results for three-dimensional Heisenberg magnets. The fits to the sublattice magnetization dependence with temperature, disregarding and considering fourth-order exchange interactions, evidenced the importance of the latter for a correct description of magnetism in EuTe. A value of 0.009 was found for the (2j(1)+j(2))/J(2) ratio between the Heisenberg J(2) and fourth-order j(1,2) exchange constants. The magnetization curve exhibited a round-shaped region just near T(N) accompanied by an increase in the magnetic peak width...