113,065 research outputs found

    Revalorizando el bosque seco de algarrobo : estudio y an谩lisis de la biodiversidad, distribuci贸n y conservaci贸n de los bosques secos en Lambayeque

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    En nuestro planeta, gran parte del 谩rea continental ha estado cubierta de bosques por millones de a帽os. En el Per煤, tanto la costa, la sierra como la selva poseen grandes bosques, que en conjunto ocupan el 51% del territorio. Los bosques secos son ecosistemas caracter铆sticos de la costa norte peruana, siendo su especie clave el algarrobo (Prosopis pallida), la cual que no solo representa un valor ecol贸gico sino tambi茅n econ贸mico para las comunidades aleda帽as a dichos ecosistemas. Esta investigaci贸n se centra en los bosques de Lambayeque, siendo definidos como representaciones de bosques secos de algarrobo los que se ubican en el Santuario Hist贸rico Bosque de P贸mac, el ACP Chaparr铆 y el ACR Huacrupe La Calera. Actualmente, es evidente que los procesos de deforestaci贸n son las causas m谩s fuertes de la reducci贸n de muchas especies forestales. Esto en conjunto con los bruscos cambios de uso de suelo, los incendios forestales de origen antr贸pico y el cambio clim谩tico vienen afectando a las comunidades humanas y muchas poblaciones de especies animales y vegetales. Una de las especies que se ve amenazada por estos factores es, precisamente, el algarrobo, por lo que su conservaci贸n junto al ecosistema de bosque seco en su plenitud es prioritaria. Por tanto, el objetivo de esta tesis es identificar y plantear qu茅 estrategias son las m谩s adecuadas para conservar y gestionar los bosques secos de manera integrada, de manera que se valoricen los recursos y servicios que ofrecen estos ecosistemas. Se trabaj贸 una metodolog铆a basada en biogeograf铆a de la conservaci贸n, la cual incluy贸 m茅todos de modelamiento de distribuci贸n de especies (MDE), sensores remotos y sistemas de informaci贸n geogr谩fica (SIG). Se utiliz贸 el software Maxent, un programa de modelamiento basado en el principio de m谩xima entrop铆a, para obtener la distribuci贸n potencial presente del algarrobo, as铆 como la distribuci贸n potencial futura (para el a帽o 2050) bajo dos escenarios RCP 2,6 y 8,5, resultando en un inesperado aumento en la potencialidad del norte peruano para albergar la especie. Para conocer la din谩mica de los bosques secos en cuanto a cambios en cobertura vegetal, frecuencia de incendios y fragmentaci贸n del paisaje se utilizaron herramientas SIG y de teledetecci贸n (como el NDVI) para realizar un an谩lisis espacial y multitemporal, dando como resultado variaciones en la cobertura vegetal, pero que tienden a la reducci贸n de la vegetaci贸n hacia los 煤ltimos a帽os. Adem谩s, se evidencia una ampliaci贸n de la frontera agr铆cola debido principalmente a la deforestaci贸n. Por otra parte, no se puede omitir el rol de los eventos del ENSO en una zona como esta, pues sus efectos influyen en la regeneraci贸n de sus bosques. El trabajo de campo consisti贸 en dos partes esenciales: en primer lugar, obtener el 铆ndice de valor de importancia (IVI) del algarrobo en el bosque seco. El m茅todo de muestreo realizado fue el punto 鈥 centro 鈥 cuadrado, obteniendo un valor de 53,01 para el algarrobo, adem谩s de conocer la composici贸n flor铆stica del bosque, tomando como referencia principal el ACR Huacrupe. En segundo lugar, se aplicaron encuestas y entrevistas a actores clave, guardaparques y a la poblaci贸n local, quienes confirmaron la importancia de la especie para el mantenimiento de los bosques secos y como aporte y hasta sustento econ贸mico de diversas comunidades, as铆 como la preocupante situaci贸n de la deforestaci贸n, principalmente ilegal para fines comerciales, degradaci贸n y continua reducci贸n de los 谩rboles de algarrobo.On our planet, much of the continental area has been forested for millions of years. In Peru, the coast, highlands and jungle, have large forests, which together occupy 51% of the territory. Dry forests are characteristic ecosystems of the northern coast of Peru, and its key species Prosopis pallida, which represents not only an ecological but also economic value to communities surrounding these ecosystems. This research focuses on the forests of Lambayeque, being defined as representations of dry forests of carob tree those located in the Pomac Forest Historical Sanctuary, the ACP Chaparr铆 and ACR Huacrupe La Calera. Currently, it is clear that deforestation is the strongest cause of the reduction of many forest species. This coupled with the rapid changes in land use, forest fires and climate change are affecting many human communities and populations of animals and plants. One species that is threatened by these factors is, precisely, carob tree, so conservation along the dry forest ecosystem in its fullness is a priority. Therefore, the objective of this thesis is to identify and propose what strategies are most appropriate to conserve and manage the dry forests in an integrated manner so that resources and services offered by these ecosystems could be valorized. A methodology based on conservation biogeography, which included methods of species distribution modeling (MDE), remote sensing and geographic information systems (GIS), was worked. The Maxent software, a modeling program based on the principle of maximum entropy, for the present potential of the carob tree distribution, and its potential future distribution (2050) under two scenarios RCP 2,6 and 8,5 was used, resulting in an unexpected increase in the potential of northern Peru to host the species. To understand the dynamics of dry forests in terms of changes in land cover, fire frequency and landscape fragmentation, GIS tools and remote sensing methods (such as NDVI) were used to perform a spatial and multi-temporal analysis, resulting in variations in coverage plant, but they tend to reduce the vegetation to recent years. Furthermore, there is a clear expansion of the agricultural frontier, mainly due to deforestation. Moreover, one cannot ignore the role of ENSO events in an area like this, since their effects influence the regeneration of forests. The field work consisted of two main parts. In first place, to obtain the importance value index (IVI) of the carob tree dry forest. The sampling method was the point 鈥 centered 鈥 quarter, obtaining a value of 53,01 for the carob tree, besides knowing the floristic composition of the forest, taking as main reference the ACR Huacrupe. In second place and finally, surveys and interviews with key players, park rangers and local people applied who confirmed the importance of the species to the maintenance of dry forests and as a contribution and economic support to various communities as well as the worrying situation of deforestation, illegal primarily for commercial purposes, habitat fragmentation, degradation and continuous reduction of carob trees.Tesi

    Comparison of physical fitness between healthy and mild鈥恡o鈥恗oderate asthmatic children with exercise symptoms: A cross鈥恠ectional study

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    .Objective Asthma is a chronic disease that may affect physical fitness, although its primary effects on exercise capacity, muscle strength, functionality and lifestyle, in children and adolescents, are still poorly understood. This study aimed to evaluate the differences in cardiorespiratory fitness, muscle strength, lifestyle, lung function, and functionality between asthmatics with exercise symptoms and healthy children. In addition, we have analyzed the association between clinical history and the presence of asthma. Study Design Cross-sectional study including 71 patients with a diagnosis of asthma and 71 healthy children and adolescents (7鈥17 years of age). Anthropometric data, clinical history, disease control, lifestyle (KIDMED and physical activity questionnaires), lung function (spirometry), exercise-induced bronchoconstriction test, aerobic fitness (cardiopulmonary exercise test), muscle strength and functionality (timed up and go; timed up and down stairs) were evaluated. Results Seventy-one patients with asthma (mean age 11.5鈥壜扁2.7) and 71 healthy subjects (mean age 10.7鈥壜扁2.5) were included. All asthmatic children had mild to moderate and stable asthma. EIB occurred in 56.3% of asthmatic children. Lung function was significantly (p鈥<鈥.05) lower in the asthmatic group when compared to healthy peers, as well as the cardiorespiratory fitness, muscle strength, lifestyle and functionality. Moreover, asthmatic children were more likely to have atopic dermatitis, allergic reactions, food allergies, and a family history of asthma when compared to healthy children. Conclusions Children with mild-to-moderate asthma presenting exercise symptoms show a reduction in cardiorespiratory fitness, muscle strength, lung function, functionality, and lifestyle when compared to healthy peers. The study provides data for pediatricians to support exercise practice aiming to improve prognosis and quality of life in asthmatic children.S

    Relationship between personality and academic motivation in education degrees students

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    p. 327-341The present study aims to understand the relationship between the big five factors of personality and academic motivation. In addition, the following variables are taken into consideration; sex, age and type of educational studies. A quantitative methodology is used, in base to a not experimental, correlational study. The sample is composed of 514 students of the Faculty of Education of Leon鈥檚 University, between the three education degrees. To gather the information, participants were asked to complete the Learning and Motivation Strategies Questionnaire (CEAM) and the Personality Questionnaire Five Factor Inventory (NEO-FFI). The results show the significant relationship between personality facets and motivation variables. It should be noted that female results were higher in the values of intrinsic motivation, motivation towards teamwork, neuroticism, and kindness, and the male results were higher in self-efficacy. Additionally, it was observed that intrinsic motivation decreases progressively from the first to the fourth year of the degree, the need for recognition decreases in the two last study years, and the openness to experiences is higher in the last year of the degree. Finally, Social Education students are those that show a higher intrinsic motivation, self-efficacy, total motivation, openness to experiences, and neuroticism, while Primary Education students鈥 results were higher in the need for recognition.S

    Sponsorship image and value creation in E-sports

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    .E-sports games can drive the sports industry forward and sponsorship is the best way to engage consumers of this new sport. The purpose of this study is to examine the effect of sponsorship image and consumer participation in co-creation consumption activities on fans鈥 sponsorship response (represented by the variables interest, purchase intention and word of mouth) in e-sports. Four antecedent variables build sponsorship image (i.e., ubiquity of sport, sincerity of sponsor, attitude to sponsor and team identification). A quantitative approach is used for the purposes of this study. Some 445 questionnaires were filled in by fans who watch e-sports in Spain; these are analyzed using partial least squares structural equation modeling (PLS-SEM). The outcomes show that sponsor antecedents are crucial factors if a sponsor wants to change their sponsorship image and influence sponsorship response, and that it is also possible to use participation to improve responsesS

    Identification of Hindbrain Neural Substrates for Motor Initiation in the hatchling Xenopus laevis Tadpole

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    Animal survival profoundly depends on the ability to detect stimuli in the environment, process them and respond accordingly. In this respect, motor responses to a sensory stimulation evolved into a variety of coordinated movements, which involve the control of brain centres over spinal locomotor circuits. The hatchling Xenopus tadpole, even in its embryonic stage, is able to detect external sensory information and to swim away if the stimulus is considered noxious. To do so, the tadpole relies on well-known ascending sensory pathway, which carries the sensory information to the brain. When the stimulus is strong enough, descending interneurons are activated, leading to the excitation of spinal CPG neurons, which causes the undulatory movement of swimming. However, the activation of descending interneurons that marks the initiation of motor response appears after a long delay from the sensory stimulation. Furthermore, the long-latency response is variable in time, as observed in the slow-summating excitation measured in descending interneurons. These two features, i.e. long-latency and variability, cannot be explained by the firing time and pattern of the ascending sensory pathway of the Xenopus tadpole. Therefore, a novel neuronal population has been proposed to lie in the hindbrain of the tadpole, and being able to 'hold' the sensory information, thus accounting for the long and variable delay of swim initiation. In this work, the role of the hindbrain in the maintenance of the long and variable response to trunk skin stimulation is investigated in the Xenopustadpole at developmental stage 37/38. A multifaceted approach has been used to unravel the neuronal mechanisms underlying the delayed motor response, including behavioural experiments, electrophysiology analysis of fictive swimming, hindbrain extracellular recordings and imaging experiments. Two novel neuronal populations have been identified in the tadpole's hindbrain, which exhibit activation patterns compatible with the role of delaying the excitation of the spinal locomotor circuit. Future work on cellular properties and synaptic connections of these newly discovered populations might shed light on the mechanism of descending control active at embryonic stage. Identifying supraspinal neuronal populations in an embryonic organism could aid in understanding mechanisms of descending motor control in more complex vertebrates

    Structural and Attitudinal Barriers to Bicycle Ownership and Cycle-Based Transport in Gauteng, South Africa

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    Policies that aim to facilitate and promote non-motorised transport (NMT), and in particular cycling, have been developed by many high-income countries facing increasingly congested roads and saturated public transport systems. Such policies are also emerging in many low- and middle-income settings where high rates of urbanisation have led to similar problems with motorised transport. The aim of the present study was to better understand the potential structural and attitudinal barriers to cycle-based transport in one such context: South Africa鈥檚 Gauteng Province, the industrial powerhouse of sub-Saharan Africa that has recently made a firm commitment to NMT. The study focussed on demographic and socioeconomic variation in bicycle and car ownership, and related this to: (1) the reported use of motorised and non-motorised transport (both private and public); and (2) perceived 鈥榩roblems鈥 with cycling. The analyses drew on interviews with key respondents from n鈥=鈥27,490 households conducted in 2013 as part of the third Quality of Life survey undertaken by the Gauteng City Regional Observatory. The survey contained items on three outcomes of interest: household vehicle ownership (bicycles and cars); modes of transport used for the 鈥渢rips鈥 most often made; and respondents鈥 鈥渟ingle biggest problem with鈥 cycling鈥. Respondent- and household-level demographic and socioeconomic determinants of these outcomes were examined using descriptive and multivariable statistical analyses, the latter after adjustment for measured potential confounders identified using a theoretical causal path diagram (in the form of a directed acyclic graph). Of the n鈥=鈥26,469 households providing complete data on all of the variables examined in the present study, only n鈥=鈥8722 (32.9%) owned a car and fewer still (n鈥=鈥2244; 8.4%) owned a bicycle. The ownership of these assets was commonest amongst wealthier, economically active households; and those that owned a car had over five times the odds of also owning a bicycle, even after adjustment for potential confounding (OR 5.17; 95% CI 4.58, 5.85). Moreover, of household respondents who reported making 鈥榯rips鈥 during the preceding month (n鈥=鈥18,209), over two-thirds of those whose households owned a car (70.1%) reported private car-based transport for such trips, while only 3.2% of those owning a bicycle reported cycling. Amongst the specific responses given to the item requesting the 鈥渟ingle biggest problem with鈥 cycling鈥 by far the commonest was 鈥淒on鈥檛 know how to cycle鈥 (32.2%), less than half as many citing 鈥淰ehicle accident risk鈥 (15.9%), and fewer still: 鈥淒estination is too far鈥 (13.9%); 鈥淐rime鈥 (10.3%); 鈥淭oo much effort鈥 (9.2%); or 鈥淟ack of good paths鈥 (4.6%). While the first of these reasons was commonest amongst poorer households, concerns about risk and effort were both most common amongst better educated, economically active and wealthier/better serviced households. In contrast, concerns over (cycle) paths were only common amongst those owning bicycles. The low prevalence of household bicycle ownership, and the disproportionate number of households owning bicycles that also owned cars, might explain the very small proportion of the 鈥榯he trips most often made鈥 that involved cycle-based transport (0.3%), and the preferential use of cars amongst households owning both bicycles and cars. Low levels of bicycle ownership might also explain why so many respondents cited 鈥淒on鈥檛 know how鈥 as the 鈥渟ingle biggest problem with鈥 cycling鈥; although risk and effort were also substantial concerns (presumably for many who did, and some who did not, know how to cycle); the lack of suitable cycle lanes being only primarily a concern for those who actually owned bicycles. Structural and attitudinal barriers to cycle-based transport limit the use of cycle-based transport in Gauteng, not only amongst the vast majority of household respondents who lack the means to cycle (and the means to learn how), but also amongst those dissuaded from learning to cycle, purchasing a bicycle and/or using a bicycle they own by: the risks and effort involved; the lack of suitable cycle paths; and/or because they also own a car and prefer to drive than cycle

    Barriers and Facilitators to the recruitment of Black African women for research in the UK: Hard to engage and not hard to reach

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    Background: Black African women living in the United Kingdom suffer from inequalities in health, care and maternity outcomes compared with their counterparts. Their presence has however been found to be lacking in life-saving healthcare research. As a result of a lack of engagement in healthcare research, some authors have classified them as 鈥渉ard to reach鈥. However, in order to reduce the health inequalities experienced by this group, methods for engagement that would suit this population group would need to be explored. Therefore, this study set out to present an ethnic specific perspective of the barriers and facilitators to the recruitment of black African women to research from the researcher鈥檚 perspective. Method: Two studies were conducted aimed at the recruitment of Black African women in healthcare research. Proposed recruitment strategies included snowballing, social media (twitter, Facebook), flyers and collaboration with gatekeepers in two NHS trusts in London. The strategies were developed based on a review of literature, best practice ethics guidelines and consultations with experts in the field. Results: Successful recruitment strategies included snowball sampling, word of mouth, peer to peer recruitment and the use of influential members in the community. Existing recruitment strategies were found to be unsuitable to properly engage members of this community. In addition to this, ethical guidelines around informed consent and gatekeeping seem to impede the successful engagement of the members of this community. Conclusion: Proper methods of engagement are required to bridge the inequality gap. Therefore, it is important that ethical procedures, processes, and recruitment methods be reviewed such that it will take into consideration the cultural peculiarities of individuals within this community

    The Idiosyncrasy of Involuntary Musical Imagery Repetition (IMIR) Experiences: The Role of Tempo and Lyrics

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    Involuntary musical imagery repetition (IMIR), colloquially known as 鈥渆arworms,鈥 is a form of musical imagery that arises involuntarily and repeatedly in the mind. A growing number of studies, based on retrospective reports, suggest that IMIR experiences are associated with certain musical features, such as fast tempo and the presence of lyrics, and with individual differences in music training and engagement. However, research to date has not directly assessed the effect of such musical features on IMIR and findings about individual differences in music training and engagement are mixed. Using a cross-sectional design (Study 1, n = 263), we examined IMIR content in terms of tempo (fast, slow) and presence of lyrics (instrumental, vocal), and IMIR characteristics (frequency, duration of episode and section) in relation to 1) the musical content (tempo and lyrics) individuals most commonly expose themselves to (music-listening habits), and 2) music training and engagement. We also used an experimental design (Study 2, n = 80) to test the effects of tempo (fast or slow) and the presence of lyrics (instrumental or vocal) on IMIR retrieval and duration. Results from Study 1 showed that the content of music that individuals are typically exposed to with regard to tempo and lyrics predicted and resembled their IMIR content, and that music engagement, but not music training, predicted IMIR frequency. Music training was, however, shown to predict the duration of IMIR episodes. In the experiment (Study 2), tempo did not predict IMIR retrieval, but the presence of lyrics influenced IMIR duration. Taken together, our findings suggest that IMIR is an idiosyncratic experience primed by the music-listening habits and music engagement of the individual

    The influence of blockchains and internet of things on global value chain

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    Despite the increasing proliferation of deploying the Internet of Things (IoT) in global value chain (GVC), several challenges might lead to a lack of trust among value chain partners, e.g., technical challenges (i.e., confidentiality, authenticity, and privacy); and security challenges (i.e., counterfeiting, physical tempering, and data theft). In this study, we argue that Blockchain technology, when combined with the IoT ecosystem, will strengthen GVC and enhance value creation and capture among value chain partners. Thus, we examine the impact of Blockchain technology when combined with the IoT ecosystem and how it can be utilized to enhance value creation and capture among value chain partners. We collected data through an online survey, and 265 UK Agri-food retailers completed the survey. Our data were analyzed using structural equation modelling (SEM). Our finding reveals that Blockchain technology enhances GVC by improving IoT scalability, security, and traceability when combined with the IoT ecosystem. Which, in turn, strengthens GVC and creates more value for value chain partners 鈥 which serves as a competitive advantage. Finally, our research outlines the theoretical and practical contribution of combining Blockchain technology and the IoT ecosystem

    Dynamic and Static Cognitive Deficits in Schizophrenia and Bipolar Disorder After the First Episode

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    Abstract Few studies have comprehensively examined the profile of cognitive functioning in first episode psychosis patients throughout the lifespan, and from first episode to chronic stage. We assessed functioning in general and specific cognitive functions, comparing both schizophrenia (N = 64) and bipolar I (N = 19) patients to controls (N = 103). Participants were from a population-based, case-control study of first episode psychosis patients, who were followed prospectively up to 10 years post first admission. A cognitive battery was administered at baseline and follow-up. By combining longitudinal and cross-sectional data, we were able to examine the cognitive profile of patients and controls throughout the entire age range of our sample (16鈥65). Schizophrenia patients exhibited widespread declines in IQ, executive function, visual memory, language ability, and verbal knowledge. However, the ages at which these declines occurred differed between functions. Deficits in verbal memory, working memory, processing speed, and visuospatial ability, on the other hand, were present at the first episode, and remained relatively static thereafter. Bipolar I patients also showed declines in IQ, verbal knowledge, and language ability, albeit at different ages to schizophrenia patients and only in verbal functions. Deficits on measures of verbal memory, processing speed, and executive function remained relatively static. Thus, both schizophrenia and bipolar I patients experienced cognitive decline in general and specific functions after the first episode, but the age at which these declines occurred differed between disorder and function. Cognitive remediation efforts may be most fruitful when targeting individual functions during specific time periods throughout adulthood
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