2,360 research outputs found
Primer registro en la Península Ibérica de Oobius rudnevi (Nowicki, 1928) (Hymenoptera: Encyrtidae), un parasitoide oófago poco conocido de Cerambyx sp. (Coleoptera: Cerambycidae)
Oobius rudnevi (Nowicki, 1928) (Hymenoptera: Encyrtidae) is first reported from Iberia and southern Europe using sentinel eggs. The parasitoid was detected in July 2016 in three oak open woodlands in Extremadura (SW Spain), located in Almendral (La Jara) and Mérida (La Serrana and Cornalvo Natural Park). O. rudnevi para-sitized both the eggs of Cerambyx cerdo Linnaeus, 1758 (its only known host to date) and C. welensii (Küster, 1845), which constitutes a new host-parasitoid association (C. welensii-O. rudnevi). Parasitism rate was quite variable among sites and dates (range 0–93%), with a higher prevalence in C. cerdo than in C. welensii. New studies are conducted in the field and laboratory to explore the ecology, behaviour and parasitic potential of O. rudnevi in Mediterranean oak open woodlands.Se cita por primera vez a Oobius rudnevi (Nowicki, 1928) (Hymenoptera: Encyrtidae) de la Península Ibérica y el sur de Europa usando huevos centinela. El parasitoide se detectó en julio de 2016 en tres dehesas en Extremadura (SO de España), localizadas en Almendral (La Jara) y Mérida (La Serrana y Parque Natural de Cornalvo). O. rudnevi parasitó tanto los huevos de Cerambyx cerdo Linnaeus, 1758 (su único hospedador conocido hasta la fecha) como los de C. welensii (Küster, 1845), lo que supone una nueva asociación hospedador-parasitoide (C. welensii-O. rudnevi). El porcentaje de parasitismo se mostró bastante variable entre sitios y fechas (rango 0–93%), con mayor prevalencia en C. cerdo que en C. welensii. Nuevos estudios se desarrollan en campo y laboratorio para explorar la ecología, comportamiento y potencial parasitario de O. rudnevi en las dehesas mediterráneas de quercíneas
When a threatened species becomes a threat: a key to reading the Habitats Directive based on occurrence and distribution of Cerambyx cerdo L. in Mediterranean urban and peri-urban areas
Abstract
Cerambyx cerdo is a large saproxylic species included in the Annex IV of the European Habitats Directive as a 'priority species'.
Although C. cerdo populations have shown a significant decline in size and distribution in central and northern European forests, in the Mediterranean basin it is often considered as a pest in urban and peri‐urban areas.
Based on European legislations currently in use, we propose a simplified decision‐making flowchart that should be followed regarding the adoption of different control measures against severe C. cerdo infestations
First record of Lobesia botrana Den. et Schiff. (Lepidoptera: Tortricidae) from the Cabrera Island (Balearic Islands)
Abstract not availabl
Folklore and traditional ecological knowledge of geckos in Southern Portugal: implications for conservation and science
Traditional Ecological Knowledge (TEK) and folklore are repositories of large amounts of information about the natural world. Ideas, perceptions and empirical data held by human communities regarding local species are important sources which enable new scientific discoveries to be made, as well as offering the potential to solve a number of conservation problems. We documented the gecko-related folklore and TEK of the people of southern Portugal, with the particular aim of understanding the main ideas relating to gecko biology and ecology. Our results suggest that local knowledge of gecko ecology and biology is both accurate and relevant. As a result of information provided by local inhabitants, knowledge of the current geographic distribution of Hemidactylus turcicus was expanded, with its presence reported in nine new locations. It was also discovered that locals still have some misconceptions of geckos as poisonous and carriers of dermatological diseases. The presence of these ideas has led the population to a fear of and aversion to geckos, resulting in direct persecution being one of the major conservation problems facing these animals. It is essential, from both a scientific and conservationist perspective, to understand the knowledge and perceptions that people have towards the animals, since, only then, may hitherto unrecognized pertinent information and conservation problems be detected and resolved
On the relationship between knowledge creation and economic performance
An empirical two-equation dynamic panel-data model system with fixed effects is proposed to analyze the relationship between knowledge creation and economic performance across regions over time. Estimates of the model for Spanish regions show that (i) knowledge creation depends on local R&D effort, on the amount of knowledge in use, and on knowledge creation in neighboring regions; and (ii) assimilation of new knowledge depends on local knowledge creation and on assimilation of knowledge in neighboring regions. Both processes include region-specific context fixed effects and region-specific time effects, representing region-specific dynamic influences. The results imply that (a) efficiency gains at regional level may be achieved by investing locally in the creation of new knowledge, either technological or organizational; (b) creation of knowledge in a region may be promoted by using greater amounts of already existing knowledge, as well as by increasing local R&D effort; (c) both knowledge creation and knowledge assimilation spread to/from neighboring regions; and (d) regional contexts influence both knowledge creation and knowledge assimilation separately.
First published online: 05 Feb 201
C-Src, ERK1/2 and Rho kinasemediate hydrogen peroxide-induced vascular contraction in hypertension: Role ofTXA2, NAD(P)H oxidase andmitochondria
AIM:
: The aim of this study was to analyse the signalling pathways involved in H2O2 vascular responses in hypertension.
METHODS:
Vascular function, thromboxane A2 (TXA2) production, oxidative stress and protein expression were determined in mesenteric resistance arteries (MRAs) from hypertensive (spontaneously hypertensive rats, SHR) and normotensive Wistar Kyoto (WKY) rats.
RESULTS:
H2O2 and the TP agonist U46619 induced greater contractile responses in MRA from SHR than WKY. Moreover, H2O2 increased TXA2 production more in SHR than in WKY. The c-Src inhibitor PP1 reduced H2O2 and U46619-induced contraction and TXA2 release in both strains. The ERK1/2 inhibitor PD98059 reduced H2O2 but not U46619-induced contraction only in SHR arteries. The Rho kinase inhibitor Y26372 reduced H2O2 and U46619-induced contractions only in SHR arteries. Basal c-Src, ERK1/2 and Rho kinase expression were greater in MRA from SHR than WKY. In SHR, the combination of PD98059 with the TP antagonist SQ29548 but not with Y27632 inhibited the H2O2 contraction more than each inhibitor alone. H2O2 and U46619 increased NAD(P)H oxidase activity and O2 production and decreased mitochondrial membrane potential in vessels from SHR. The effects induced by H2O2 were abolished by inhibitors of TXA2 synthase, ERK1/2 and c-Src. The mitochondrial antioxidant mitoTEMPO reduced H2O2-induced contraction and NAD(P)H oxidase activation.
CONCLUSION:
In arteries from WKY, c-Src mediates H2O2 contractile responses by modulating TXA2 release and TXA2 effect. In SHR, H2O2 induces c-Src dependent TXA2 release that provokes vascular contractile responses through Rho kinase, c-Src and O2 from NAD(P)H Oxidase and mitochondria. Moreover, ERK1/2 activation contributes to H2O2 contraction in SHR through effects on mitochondria/NAD(P)H Oxidase
Risk factors for non-melanoma skin cancer in kidney transplant patients in a Spanish population in the Mediterranean region
Non-melanoma skin cancer (NMSC) is the most frequent malignancy in organ transplant recipients. The aetiology of NMSC after transplant is multifactorial. The aim of this study was to determine the clinical and environmental factors involved in the development of NMSC in a Spanish kidney transplant population from the Mediterranean region. A total of 289 patients who had received a kidney transplant during the period January 1996 to December 2010 were included in the study. Both prospective and retrospective data were used. All patients underwent a structured interview and a complete examination of the skin. After a median follow-up of 72 months (range 12-180 months), 73 of the 289 patients (25.2%) developed 162 tumours. The ratio of basal cell carcinoma to squamous cell carcinoma was 2.21:1. The cumulative incidence of NMSC increased with the duration of immunosuppression, from 20.78% at 5 years, to 37.35% at 10 years to 53.08% at 15 years after transplantation. Age at the time of transplant, phototype and occupational sun exposure were associated with a higher risk of NMSC. NMSC is a significant clinical problem in kidney transplant recipients. This has implications for the development of prevention and surveillance strategies. Clinical and environmental factors may be used to identify those patients who are at risk for NMSC
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