26 research outputs found
Restrição da poliembrionia em tangerineira "Cleópatra" mediante a cultura in vitro de embriões imaturos.
Study of Damage Propagation at the Interface Localization-Delocalization Transition of the Confined Ising Model
The propagation of damage in a confined magnetic Ising film, with short range
competing magnetic fields () acting at opposite walls, is studied by means
of Monte Carlo simulations. Due to the presence of the fields, the film
undergoes a wetting transition at a well defined critical temperature .
In fact, the competing fields causes the occurrence of an interface between
magnetic domains of different orientation. For ) such
interface is bounded (unbounded) to the walls, while right at the
interface is essentially located at the center of the film.
It is found that the spatio-temporal spreading of the damage becomes
considerably enhanced by the presence of the interface, which act as a
''catalyst'' of the damage causing an enhancement of the total damaged area.
The critical points for damage spreading are evaluated by extrapolation to the
thermodynamic limit using a finite-size scaling approach. Furthermore, the
wetting transition effectively shifts the location of the damage spreading
critical points, as compared with the well known critical temperature of the
order-disorder transition characteristic of the Ising model. Such a critical
points are found to be placed within the non-wet phase.Comment: 22 pages, 13 figures include
Evidências de Validade do Teste Luria-Nebraska para Crianças: Relações com Escolaridade e Inteligência
Reemerging of natural infection by Trypanosoma evansi in horses in Arari, Marajó Island, Brazil
Dengue-specific serotype related to clinical severity during the 2012/2013 epidemic in centre of Brazil
Abstract Multilingual abstracts Please see Additional file 1 for translations of the abstract into the five official working languages of the United Nations. Background Currently, in Brazil, there is a co-circulation of the four dengue (DENV-1 to DENV-4) serotypes. This study aimed to assess whether different serotypes and antibody response patterns were associated with the severity of the disease during a dengue outbreak, which occurred in 2012/2013 in centre of Brazil. Methods We conducted a prospective study with 452 patients with laboratory confirmed dengue in central Brazil, from January 2012 to July 2013. The clinical outcome was the severity of cases: dengue, dengue with warning signs, and severe dengue. The patients were evaluated at three different moments. Blood sampling for laboratory testing and confirmatory tests for dengue infection were performed. We performed a multinomial analysis considering the three categories of the dependent variable, as outlined above. The odds ratios (ORs) were calculated. A multinomial logistic regression model was applied for variables with a P-value <0.20. Statistical analysis was performed with STATA 12.0 software. Results Four hundred fifty-two patients (452/632, 71.5%) were diagnosed with dengue. The dengue virus (DENV) serotypes were identified in 243 cases. DENV-4 was detected in 135 patients (55.6%), DENV-1 in 91 (37.4%), DENV-3 in 13 (5.3%), and DENV-2 in 4 (1.6%). Patients with the DENV-1 serotype were more prone to present with several clinical and laboratory features as compared with DENV-4 patients, including spontaneous bleeding (P = 0.03), intense abdominal pain (P = 0.004), neurological symptoms (P = 0.09), and thrombocytopenia (P = 0.01). Secondary infection was more predominant among DENV-4 cases (80.0%) compared with DENV-1 cases (62.3%) (P = 0.03). The univariate analysis showed that females (OR = 2.12; 95% CI: 1.44–3.13; P < 0.01) had a higher risk of having dengue with warning signs. The multinomial analysis showed that severe dengue cases with secondary infection had an adjusted OR of 2.80 (95% CI: 0.78–10.00; P = 0.113) as compared with dengue fever with primary infection when adjusted for age and sex. Conclusion The current data show that 5.8% of patients recruited for treatment in healthcare centres and hospitals during the study period had severe dengue. DENV-4 was the predominant serotype, followed by DENV-1, in a large outbreak of dengue in central Brazil. Our findings contribute to the understanding of clinical differences and immune status related to the serotypes DENV-1 and DENV-4 in central of Brazil
Orchidaceae of the Grumari restinga: floristic and similarity among restingas in Rio de Janeiro state, Brazil
The Severity of COVID-19 Affects the Plasma Soluble Levels of the Immune Checkpoint HLA-G Molecule
The non-classical histocompatibility antigen G (HLA-G) is an immune checkpoint molecule that has been implicated in viral disorders. We evaluated the plasma soluble HLA-G (sHLA-G) in 239 individuals, arranged in COVID-19 patients (n = 189) followed up at home or in a hospital, and in healthy controls (n = 50). Increased levels of sHLA-G were observed in COVID-19 patients irrespective of the facility care, gender, age, and the presence of comorbidities. Compared with controls, the sHLA-G levels increased as far as disease severity progressed; however, the levels decreased in critically ill patients, suggesting an immune exhaustion phenomenon. Notably, sHLA-G exhibited a positive correlation with other mediators currently observed in the acute phase of the disease, including IL-6, IL-8 and IL-10. Although sHLA-G levels may be associated with an acute biomarker of COVID-19, the increased levels alone were not associated with disease severity or mortality due to COVID-19. Whether the SARS-CoV-2 per se or the innate/adaptive immune response against the virus is responsible for the increased levels of sHLA-G are questions that need to be further addressed
O espaço funerário: comemorações privadas e exposição pública das mulheres em Atenas (séculos VI-IV a.C.)
Estudo sobre a comemoração funerária das mulheres em Atenas a partir dos epigramas. Trata-se de explorar a hipótese de que os contextos funerários, como espaços de 'publicização' e de exposição, mostram uma relação positiva da comunidade políade com as mulheres, através da valorização de temas como o das relações de philia e da recorrência de elogios derivados da tradição épica, em épocas anteriores destinados apenas aos elogios fúnebres masculinos. Discute-se essa positividade sob a ótica da tese de Vernant sobre a forte conexão entre espaço público e identidade política, concluindo que a apresentação feminina em espaços funerários pode ser concebida como uma das formas pelas quais a sociedade políade representa sua identidade, ultrapassando o quadro restrito dos valores cidadãos