Universidad del Rosario (officially in Spanish: Colegio Mayor de Nuestra Señora del Rosario) is a Colombian university founded on Roman Catholic principles, in 1653 by Fray Cristobal de Torres. Located in Bogotá, due to its important place in Colombian history, it is known as "the Cradle of the Republic". Most faculties reside at the Cloister, the main campus located in the historic-geographical centre of Bogotá. It also included a private all-male traditional primary and secondary school until 2008. Nowadays the institution is based on secular ideas and remains very influential in Colombian culture and public life. At least 28 of Colombia's Presidents have been students of this university. It has influenced and participated in very important transitional processes like the revolution for the independence from Spain and the drafting of the Political National Constitution of 1991. One of the most important 1886 Constitution's Supreme Court (1936), the so-called golden court, was composed in its majority by lawyers from the Faculty of Jurisprudence.
This study assesses the Sit-To-Stand (STS) power across different age groups, and revises the biomechanical basis of existing power equations. Cross-sectional data from 159 Argentinian individuals (18 to 90 years) were analyzed, including 5 repetitions STS, ultrasonography, handgrip and leg press tests. Regression analysis and statistical hypothesis tests where used to find correlations and differences within obtained data. A large correlation ( r=0.976 ) was observed between average power and root mean squared (RMS) power, suggesting that existing mean power equations are clinically sufficient, as inertial effects are negligible. STS power peaked at approximately ( 36± 15 ) years, followed by a decline. The strongest correlations were found for peak leg press force ( r=0.678 ) and leg press rate of force development ( r=0.691 ). STS power correlated significantly with handgrip strength but not with the echogenicity index, highlighting the clinical relevance of separately evaluating each of these indicators.
The concept of Granger causality is an important tool in applied macroeconomics. Recursive econometric methods to analyze the temporal stability of Granger-causal relationships have recently been developed. These recursive procedures are used to re-evaluate the temporal stability of Granger causality between US industrial production and three macroeconomic variables. There appears to be significant evidence of temporal variation in the causal relationships. A clear pattern that emerges from the results is that the causal channels from all three variables to industrial production appear to be very strong in the latter part of the sample period.
Soils harbor more than half of Earth's biodiversity, with soil fauna representing one of the most diverse groups. However, understanding the drivers influencing their biodiversity remains limited. Upper Andean tropical forests are among Earth's most biodiverse ecosystems, but have undergone large-scale historical transformations, resulting in landscapes with different forest successional stages. In this study, we aimed to analyze soil fauna communities along a successional gradient in Colombia's Eastern Andean forests and identify key microclimatic, soil, and forest structural drivers. We collected soil fauna from 168 samples (30x30x5 cm), in dry and wet seasons, in 14 permanent plots (20x20 m) located in four sites. Data on microclimate, nutrients, productivity, plant diversity, and litter functional richness were gathered from these permanent plots. We observed significant soil fauna biodiversity turnover among Andean montane forest sites, mirroring the distinctive floristic composition between them. We also found that soil fauna richness and abundance increased with succession, attributed to higher productivity and more suitable microclimatic conditions in old-growth forests. Our findings suggest that the primary driver of soil fauna richness in tropical mountain Andean forests is the amount of energy (i.e, forest productivity), while soil fauna abundance is mainly influenced by thermal conditions. Additionally, factors framed within the physiological tolerance hypothesis (i.e., calcium, aluminum) and within the habitat heterogeneity hypothesis (i.e., litter functional richness, plant diversity) also play a role, albeit to a lesser extent. This study emphasizes the importance of examining forest recovery including soil fauna groups to understand successional patterns in tropical mountain forests.
ABSTRACTLeaf litter decomposition constitutes one of the most vital processes for maintaining productivity and carbon release in ecosystems. However, this remains one of the least understood processes in upper Andean tropical forests (UATF), a highly diverse ecoregion that has undergone extensive transformation over the centuries. In this study, we aimed to determine the relationships between decomposition rates of leaf litter, leaf functional traits, and microclimatic conditions along a successional gradient of UATF. We also tested the “after‐life effect” by analyzing changes between green and senescent leaves. We performed a fully reciprocal translocation experiment with 15 representative species of UATF in a set of 14 permanent plots by using 2520 litterbags distributed across 42 experimental units (three litterbeds per plot), over 1.5 years, with four harvesting times (3, 6, 12, and 18 months). Chemical and physical traits were measured in green and senescent leaves to identify the best predictors of decomposition and to analyze the “after‐life effect.” We found that functional traits and species identity drive litter decomposition in UATF, rather than succession and microclimatic conditions of soil moisture and temperature. The relative importance of traits was prevalent in all stages of decay, despite being stronger in the early phases. Although we found an “after‐life effect” of green leaves in decomposition, changes in chemical composition from green to senescent leaves indicated substantial nitrogen resorption, which is a limiting resource in tropical montane forests. With the increasing landscape transformation in UATF, changes in plant species composition could have profound impacts by altering decomposition rates, nutrient cycling, and global carbon storage.
Chan and Seceleanu have shown that if a weighted shift operator on $\ell^p(\mathbb{Z})$ , $1\leq p \lt \infty$ , admits an orbit with a non-zero limit point then it is hypercyclic. We present a new proof of this result that allows to extend it to very general sequence spaces. In a similar vein, we show that, in many sequence spaces, a weighted shift with a non-zero weakly sequentially recurrent vector has a dense set of such vectors, but an example on $c_0(\mathbb{Z})$ shows that such an operator is not necessarily hypercyclic. On the other hand, we obtain that weakly sequentially hypercyclic weighted shifts are hypercyclic. Chan and Seceleanu have, moreover, shown that if an adjoint multiplication operator on a Bergman space admits an orbit with a non-zero limit point then it is hypercyclic. We extend this result to very general spaces of analytic functions, including the Hardy spaces.
