Publications by authors named "Juliana Valencia"
Optimization of flow cytometry assays for extracellular vesicles (EVs) often fail to include appropriate reagent titrations - the most critically antibody titration is either not performed or is incomplete. Using nonoptimal antibody concentration is one of the main sources of error leading to a lack of reproducible data. Antibody titration for the analysis of antigens on the surface of EVs is challenging for a variety of technical reasons.
View Article and Find Full Text PDFTransoral flexible laser surgery of the upper aerodigestive tract with blue laser.
Eur Arch Otorhinolaryngol
February 2023
Purpose: The introduction of fiber-guided lasers was a breakthrough in laryngology practice, opening the path for treating different pathologies with minimally invasive procedures, both in the operating room and in the office. The most recent technology in the area is the blue laser, which combines photoangiolytic and cutting properties, characteristics that make this equipment suitable for its use in upper aerodigestive tract surgery. However, there is not enough experience in this area.
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- Climate change in southern Europe is causing higher temperatures and lower rainfall, impacting resource availability for herbivores and potentially affecting their reproductive performance and sexual selection.
- A study on Iberian red deer revealed that decreased rainfall correlates with a delayed rutting season and lower male rutting activity, while increasing opportunities for polygyny (one male mating with multiple females).
- The findings emphasize that environmental changes, particularly reduced rainfall, can influence mating conditions and sexual selection opportunities in wildlife, moderated by factors like population density and sex ratio.
Sexual signals play a central role in male-male competition in polygynous species. In red deer (Cervus elaphus), male's ventral area become dark during the rutting season due to urine spraying behaviour and retains many chemical compounds potentially revealing individual features. Here we investigate the variation in size of this trait, exploring its relationship with age and male competitive features such as antlers or body size, as well as populational level of intrasexual competition for mates.
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- Theory suggests that sex-trait expression, like antler size, is influenced by both production costs and social factors such as rivals and mates, although clear evidence is lacking.
- A study of over 4,000 male Iberian red deer showed that those in environments with low male competition developed smaller antlers, leading to reduced energy demands and less tooth wear, which may contribute to longer lifespans.
- Experimental results confirmed that males with rival competition grew larger antlers compared to those in female-only environments, providing new evidence of how social competition affects sexual traits and longevity.
Individuals within animal groups may differ in personality and degree of familiarity raising the question of how this influences their social interactions. In Iberian magpies Cyanopica cooki, a portion of first-year males engage in cooperative behaviours and dispersal, allowing addressing this question. In this study, we first investigate the relationship between colony familiarity (native versus foreign) and reproductive status (breeding versus helping) of males during 21 years.
View Article and Find Full Text PDFFitness can be profoundly influenced by the age at first reproduction (AFR), but to date the AFR-fitness relationship only has been investigated intraspecifically. Here, we investigated the relationship between AFR and average lifetime reproductive success (LRS) across 34 bird species. We assessed differences in the deviation of the Optimal AFR (i.
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- Researchers suggest that the balance between reproduction and bodily repair can influence senescence, especially hard to study in large animals.
- They analyzed teeth wear in a large sample of red deer, finding that males had smaller molar teeth that wore down faster than females, indicating a higher workload and earlier aging.
- These results support the disposable-soma hypothesis, which posits that energy invested in bodily repair decreases when the benefits of survival or reproduction are uncertain.