‘Turiaçu’ is a pineapple variety native to the Amazon region with high commercial potential that remains unexplored. Its propagation traditionally relies on vegetative material from mother plants, which increases the risk of pathogen transmission. Temporary immersion bioreactors (TIBs) are an alternative for large-scale production of disease-free plantlets, but their efficiency depends on the optimization of culture conditions. This study aimed to evaluate the effects of photoautotrophic and photomixotrophic in vitro cultivation of ‘Turiaçu’ pineapple under different light intensities in TIBs, as well as the subsequent ex vitro acclimatization performance of the plants. Explants were cultivated under light intensities of 71 and 116 µmol m⁻² s⁻¹, in culture media containing 0–15 g L⁻¹ of sucrose. After 50 days of in vitro growth, biometric parameters, photosynthetic pigments, gas exchange, and leaf anatomy were evaluated. Following 30 days of ex vitro acclimatization, survival, growth, and physiological performance were analyzed. The presence of sucrose in the culture medium was the main factor influencing growth and photosynthetic performance. Photoautotrophic conditions stimulated photosynthetic capacity, whereas photomixotrophic cultivation promoted greater biomass accumulation, particularly under 71 µmol m⁻² s⁻¹. Both cultivation modes resulted in 100
We investigate quantum and classical signatures of a Schwarzschild black hole embedded in a Hernquist dark matter halo. Starting from the exact spherically symmetric solution describing this composite system, we analyze particle production for both bosonic and fermionic fields using semiclassical techniques. Hawking radiation is derived through Bogoliubov transformations and independently via the tunneling method with energy conservation, allowing us to identify the effective temperature, emission spectrum, and the role of dark matter parameters in suppressing particle creation. The evaporation process is examined in the high-frequency regime, leading to modified evaporation times and emission rates relative to the vacuum Schwarzschild case. We further study absorption and scattering of massless scalar waves employing a partial-wave analysis, computing phase shifts, partial and total cross sections, and assessing the impact of the Hernquist scale radius and density on these observables. Finally, null and timelike geodesics are explored to characterize light propagation and particle motion in the presence of the dark matter halo.
In this paper we present a ground state solution result for the nonlocal operator such as the generalized p-Laplacian operator with a logarithmic nonlinearity, for which we will use variational methods explicitly the Nehari method.
The aim of this study was to investigate the seasonal and circadian dynamics of the essential oil (EO) of Ageratum conyzoides (purple-inflorescence chemotype) and its relationship with acaricidal activity against Rhipicephalus microplus. Seasonal collections were performed monthly at 6 a.m. throughout 2023, while circadian profiles were obtained at 6, 9, and 12 a.m., and 3 and 6 p.m. in April (rainy season) and October (dry season). The EO was extracted by hydrodistillation, characterized by GC-MS, and evaluated using the larval immersion test. Yields ranged from 0.03% to 0.24% (v/w), with lower and more stable values in the rainy season and higher values in the dry season. A total of 96 constituents were identified, representing 89.62% of the oil composition, with predominance of sesquiterpenes. Major compounds included caryophyllene oxide, spathulenol, humulene epoxide II, α-cadinol, α-santalene, β-elemene, and p-cymene. Acaricidal activity varied markedly between seasons. Rainy-season samples showed low larval mortality across all concentrations, preventing LC₅₀ determination. In contrast, dry-season samples exhibited consistent activity, with LC₅₀ = 130 µg/mL. This enhanced activity was associated with a higher proportion of oxygenated sesquiterpenes, particularly spathulenol. Circadian variation had a secondary effect; however, early morning collections (6 a.m.) during the dry season showed greater chemical stability and improved biological response. These findings indicate that seasonal variation significantly influences the acaricidal efficacy of A. conyzoides EO, and that collection during dry periods and early morning may improve reproducibility and effectiveness for tick control applications.
In this work, we present a theoretical analysis of null geodesics, critical photon orbits, and shadow formation associated with a wormhole generated by a geometric defect. The propagation of light in this spacetime is examined through the deflection angle in both weak-and strong-field regimes. Analytical expansions are derived in each regime and employed to characterize gravitational lensing observables. By varying the global monopole charge, we evaluate its impact on these observables and determine parameter ranges that may be accessible to current or future observational probes. Finally, we calculate the quasinormal modes and the time-domain solution for scalar perturbations.
