University of Las Palmas de Gran Canaria
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Modelling of heat conduction calorimeters. Case of a non-differential skin calorimeter
No full textIn non-differential calorimeters, the ambient temperature, the thermostat temperature, and the thermostat
cooling system affect the measured heat flux. For this reason, the modelling and calibration procedures should
take into account all the variables that affect the heat flux transmitted through the calorimeter. In this work, we
present the complete calibration of three non-differential skin calorimeters designed to measure the heat flux, the
heat capacity and the thermal resistance of a localized skin surface. In addition, the incorporation of the skin into
the calorimetric model allows the determination of the core temperature of the tissue where the measurement is
performed. The electrical calibration is validated with measurements with the three calorimeters on the volar
and dorsal areas of the wrist of a healthy 30-year-old male subject100,5723,1Q2Q2SCIE11,
Unusual Mass Mortality of Atlantic Puffins (Fratercula arctica) in the Canary Islands Associated with Adverse Weather Events
No full textThe Atlantic puffin (Fratercula arctica) is a seabird species characterized by great
diving capabilities and transoceanic migratory behavior. These movements contribute
to the dispersion of the species during migration, and episodes of mortality associated
with migration may be a normal event in the dynamic of the Atlantic puffin populations.
This study aimed to describe the anatomopathological findings of an unusual mortality
event of Atlantic puffins observed during the non-breeding period along the coast of
the Canary Islands. The most consistent gross finding during necropsy was generalized
muscle atrophy and fat depletion. The main histological findings were centered in the
urinary tract, with dilation and inflammation of the primary ureter branch and medullary
cones, and intraluminal trematodes identified as Renicola sloanei based on morphology and
molecular analysis. Influenza virus infection was ruled out. The postmortem investigations
performed in this mortality event of Atlantic puffins indicate that the animals were severely
emaciated and suffered from nephropathy. The etiopathological investigation performed in
relation to this mortality event of Atlantic puffins indicates starvation associated with bad weather conditions during migratory movement as the most likely cause of the unusual
mortality event.110,6982,7Q1Q1SCIE10,
On the Macaronesian endemic woody spurgeEuphorbia regis-jubae Webb & Berthel. andeponyms honouring the Numidian King Juba II(48 BCE–23/24 CE)
No full textNumidian King Juba II (48 BCE–23/24 CE) ruled the north-western African Roman client kingdom of Mauretania between the year 25 BCE until his death. During his patronage natural history expeditions were undertaken in Africa. The Canary Islands were among the areas whose exploration he sponsored, and this represented the earliest survey of the natural history of this archipelago. Juba II is
considered to be one of the most important promoters of the study of geography, fauna, and flora in ancient times. His writings are lost, but the Roman army officer and naturalist Pliny the Elder (Caius Plinius Secundus, 23/24–79 CE) had access to them, and in his multivolume work Naturalis Historia provided extensive accounts of Juba’s natural history descriptions. Relevant for our research, they included the earliest known report for the genus Euphorbia (as “Euphorbea” in Pliny’s work). Eponyms for four generic names, three specific epithets, and one varietal name celebrate the legacy of Juba II. Here we provide an overview of the biogeography and phylogenetics of these taxa, with an emphasis on the Canary Island endemic E. regis-jubae Webb & Berthel. We also discuss Pliny’s description of Euphorbia and highlight the importance of eponyms to provide insights into the botanical history of
Macaronesia.156,
Preliminary results on the effects of the California poppy ( Eschscholzia californica Cham.) and the Fairy crassula ( Crassula multicava Lem.) on the island of Tenerife (Canary Islands)
No full textDue to their distinctive ecosystems and the presence of endemic species with restricted
ranges, archipelagos are particularly vulnerable to emerging threats like invasive species. This
research project aims to assess the invasive potential of the California poppy (
Eschscholzia
californica) and the pink crassula (
Crassula multicava) on the island of Tenerife, Canary
Islands. The California poppy, native to North America, was introduced to the Canary Islands
as an ornamental plant during the 19th century. It is commonly found along paved areas and
clearings within the Canarian pine forest. The pink crassula, native to South Africa, was
introduced during the 20th century and thrives in Canarian laurel forest areas near urban
settlements. The main objective of this project is to map and monitor the populations of
these species on the island of Tenerife, determine their responses to different environmental
conditions, as well as to various eradication treatments, and assess their invasive impact on
native and/or endangered flora. Fieldwork has shown a broader than previously thought
distribution of both species, with increasing populations observed in new areas. In addition,
30% of the records show direct competition with other plant species, while 17% demonstrate
competition with endemic species.
Eschscholzia californica reproduces effectively through
sexual means, establishing a long-term seed bank.
Crassula multicava establishes itself
successfully through vegetative multiplication, easily invading areas through the fall of
propagules. Both species have shown a capacity to form new seedlings continually, making
eradication efforts challenging. These findings indicate a high invasive potential for both
species on Tenerife, underlining the need for effective management and control measures to
prevent further spread. In conclusion, this research highlights the growing concern over
these invasive species and their impact on Tenerife’s ecosystems, emphasizing the
importance of ongoing monitoring and intervention.
Vegetative multiplication and resilience of Crassula multicava Lem.: challenges for mechanical eradication in the Canary Islands
No full textBiological invasions in oceanic archipelagos threaten island ecosystems due to the rich
endemic biodiversity they support.
Crassula multicava is a succulent species found in shaded
environments along the subtropical coastline of South Africa. In the Canary Islands, this
species invades zones within the Canarian laurel forest domain. Mechanical eradication tasks
raise serious doubts about their effectiveness because this species is capable of regrowing
from vegetative propagules. This work evaluates the regrowing capacity of leaves, leaf
fragments, stems, and stem fragments of
C. multicava under different treatments. For this
purpose, 18 individuals of
C. multicava were collected in a population inhabiting the Bosque
del Adelantado (El Rosario, Tenerife), with 9 subjected to irrigation every two days and 9
subjected to natural environmental conditions, serving as controls. For each individual, 8
leaves and 8 stem sections were selected and subjected to darkness, burial and cutting
treatments. After seven weeks, some propagules exhibited the ability to regrow, developing
roots and/or shoots. However, the irrigated propagules showed a faster regrowth rate than
the controls, with longer roots and larger shoots. This work demonstrates the high
invasiveness of
Crassula multicava due to its high vegetative multiplication and resilience
under different temperature, light, and humidity scenarios. These results explain why
mechanical eradication is not always effective and highlight the need for continuous
monitoring at the action sites.
Efectividad Del Método Pilates En El Embarazo En La Mejora De Los Resultados Maternales-Neonatales. Umbrella Review.
No full textConsecuencias Psicológicas Y Emocionales Que Conlleva Para El Paciente La Gestión De La Diabetes Mellitus Tipo 1
No full text
Reassessment of Porosimetry Determinations Using Water Vapor Sorption Measurements for Pastes and Concretes Containing Basaltic Aggregates Compared to the Mercury Intrusion Method
No full textConcrete porosity is one of the fundamental properties for the structural characterization of cementitious materials. This study compares porosity data obtained with dynamic water vapor sorption (DWVS) with the more commonly used mercury intrusion porosimetry (MIP) method for a wide range of concrete samples made with basaltic aggregates, typical of the Canary Islands, which are porous. The objective was to propose an alternative method for routine concrete monitoring that avoids the use of a hazardous substance such as mercury. The results reveal fundamental differences between the MIP and water-accessible porosimetry (WAP) data, although a correlation between the methods was revealed where MIP = 1.18 x WAP. The study was completed by an analysis of the relationships between the porosity and the characteristics and properties of concrete (water/cement ratio and strength), as well as the calculation of the tortuosity factor and a frost durability factor.201200,5653,1Q2Q1SCIE10,