Silvia Tejada Gavela

• PhD
• Suporting Research at Hospital Son Llàtzer

La Analítica del Aprendizaje (Learning Analysis, LA) es un proceso cíclico que implica medir, recolectar y analizar datos educativos para mejorar el contexto educativo y los procesos de enseñanza-aprendizaje. La interpretación de estos datos es efectiva cuando se alinea con el contexto educativo original, comprendiendo la relación entre la tecnolog...

La motivación es una necesidad pedagógica en el aula universitaria ya que para aprender es imprescindible poder hacerlo, es imprescindible querer aprender, es decir, tener la disposición, intención y motivación suficiente. Para motivar a los alumnos se debe intentar que alcancen su campo de satisfacción propuesta por el docente. El objetivo de esta...

Las nuevas Tecnologías de la Información y la Comunicación (TIC) son un recurso que bien utilizado por el profesorado puede permitir la motivación del alumnado con respecto a diferentes especialidades, como serían las ciencias. Dentro de las diferentes TIC que se pueden escoger, la revista digital supone una herramienta digital que permitiría alcan...

The loggerhead turtle, Caretta caretta, is a very vulnerable species to human action which means that numerous specimens arrive at the recovery centres to be treated until they can be returned to the natural environment. The aim of the present study was to investigate the physiological evolution of C. caretta specimens that have entered a recovery...

Nonalcoholic fatty liver disease (NAFLD) is a chronic disease that includes different disorders related to the liver generating inflammation, fibrosis, and cirrhosis, which may lead to liver failure and hepatocellular carcinoma. It is directly related to metabolic syndrome and an increased risk of cardiovascular disease, type 2 diabetes mellitus, o...

Background: Hypertension is a high prevalent chronic disease worldwide and a major cardiovascular risk factor. Oleanolic acid (3β-hydroxy-olea-12-en-28-oic acid) is a wide distributed bioactive pentacyclic triterpenoid with diverse biological activities such as anti-inflammatory, hepaprotective anti-diabetic or anti-hypertensive. Objective: The ai...

Dietary recommendations are frequently developed based on nutrient deficiency or prevention of disease, but less attention has been paid to the dietary guidelines to promote brain health. Active and healthy aging is a prerequisite for improving quality of life as people age, and evidence is establishing a relationship between diet and brain health....

Obesity is a major health concern for a growing fraction of the population, with the prevalence of obesity and its related metabolic disorders not being fully understood. Over the last decade, many attempts have been undertaken to understand the mechanisms at the basis of this condition, in which the accumulation of fat occurring in adipose tissue,...

The endemic fan mussel (Pinna nobilis) in the Mediterranean Sea is at high risk of disappearance due to massive mortality events. The aim of the study was to evaluate the antioxidant response of P. nobilis collected in the Balearic Islands (Western Mediterranean) before and after the mass mortality event. Individuals collected before (between 2011...

The concentrations of cadmium (Cd), mercury (Hg) and lead (Pb) were determined in muscular tissue of eleven loggerhead turtles (Caretta caretta) from the Balearic Islands (Spain, Western Mediterranean). The metal levels found in the present study were similar or lower than concentrations detected in Andalusia (mainland Spain), Italy, Canary Islands...

Posidonia oceanica is an endemic marine phanerogam of the Mediterranean Sea which is very sensitive to the environmental changes, especially those related to human activities. The aim of this study was to evaluate the oxidative stress status of P. oceanica meadows exposed to spillage of hypersaline water from a desalination station by using biomark...

Background: Nonalcoholic fatty liver disease (NAFLD) is characterized by excessive fat accumulation, especially triglycerides, in hepatocytes. If the pathology is not properly treated, it can progress to nonalcoholic steatohepatitis (NASH) and continue to fibrosis, cirrhosis or hepatocarcinoma. Objective: The aim of the current research was to iden...

Environmental enrichment is considered as a recommended tool to guarantee or improve the welfare of captive fish. This study demonstrates for the first time that structural environmental enrichment enhances cognition, exploratory behaviour and brain physiological functions of gilthead seabream (Sparus aurata). Seabream was reared in groups (n = 15)...

Wetlands are very fragile systems and susceptible to being affected by human activity. S'Albufera de Mallorca Natural Park is the main wetland in Mallorca Island (Spain), and undergoes a salinization process derived from the overexploitation of adjacent aquifers, which favors marine intrusion. The objective was to evaluate the effects of salinity c...

Pollution derived from human activities and the arrival of invasive species are common worldwide and affect coastal marine ecosystems negatively, and more especially in a semi-closed sea such as the Mediterranean Sea. The aim of the study was to evaluate oxidative stress biomarkers in the gonadal tissue of the sea urchin Paracentrotus lividus (Lama...

Mental disorders comprise diverse human pathologies including depression, bipolar affective disorder, schizophrenia, and dementia that affect millions of people around the world. The causes of mental disorders are unclear but growing evidence suggests that oxidative stress and the purine/adenosine system play a key role in their development and pro...

Background Triterpenes is a large group of secondary metabolites mainly produced by plans with a variety of biological activities including potential antitumor effects. Hepatocellular carcinoma (HCC) is a very common primary liver disease spread worldwide. The treatment can consist in surgical intervention, radiotherapy, immunotherapy and chemother...

Irrespective of sex and age, cancer is the leading cause of mortality around the globe. Therapeutic incompliance, unwanted effects, and economic burdens imparted by cancer treatments, are primary health challenges. The heritable features in gene expression that are propagated through cell division and contribute to cellular identity without a chang...

A large number of studies have demonstrated the implication of oxidative stress (OxS) in the pathogenesis of ageing-related muscle decline and atrophy. The key mechanism is related to the OxS-induced production of free radicals, with the consequent increase in oxidative damage, resulting in affected muscle quality and strength. The present study ai...

Background Non-alcoholic fatty liver disease (NAFLD) is one of the most common causes of chronic liver disease worldwide directly related to the progressive increase in overweight and obesity. The accumulation of lipids in patients with NAFLD contributes to the development of insulin resistance, inflammatory response and oxidative stress in hepatoc...

The arrival of invasive alien species represents key threats to native biodiversity worldwide becoming an important and growing concern. The Mediterranean Sea is a quasi-enclosed body of water connected to the Atlantic and Indian Oceans that makes it very susceptible to being affected by the arrival of invasive species. The Atlantic blue crab, Call...

Polyphenols are secondary metabolites widely distributed in many plant foods, such a tea, coffee, chocolate and fruits. The consumption of these compounds is related to the improvement or amelioration of many diseases, including diabetes. Nevertheless, the great barrier to the therapeutic use of polyphenols is the low bioavailability of these compo...

Cardiovascular diseases comprise of non-communicable disorders that involve the heart and/or blood vessels and have become the leading cause of death worldwide with increased prevalence by age. mTORis a serine/threonine-specific protein kinase which play a central role in many physiological processes including cardiovascular diseases, and also inte...

Population aging has becoming one of the major medical and socioeconomic challenges of modern societies. Therefore the research of causes and therapies to mitigate the negative effects of aging is becoming a priority purpose in research. It has been pointed out as principal cause of aging the oxidative stress and ultimately inflammation, especially...

Perkinsus mediterraneus is a protozoan parasite that can cause marine mollusc diseases known as perkinsosis being a serious threat for clam cultures worldwide. The aim of the present study was first to determine the Perkinsus species infecting the variegated scallop Mimachlamys varia and then to evaluate the existence of oxidative stress in gills o...

En la actualidad la multidisciplinariedad es uno de los pilares de la educación a todos los niveles que permite desarrollar diversas competencias y la coordinación entre el profesorado. La coordinación entre grupos docentes es básica para conseguir una enseñanza sin solapamientos de conceptos y actividades incrementando la eficiencia de la utilizac...

Los planes docentes de diversas titulaciones suponen una coincidencia en la asignatura de Fisiología Humana (grados: Fisioterapia, Biología, Bioquímica y Medicina), en los cuales las horas docentes destinadas a grupos pequeños suponen una buena estrategia para alcanzar determinadas competencias que no se podrían alcanzar con grupos grandes. La real...

Chronic and non-healing wounds, especially diabetic foot ulcers and radiation injuries, imply a remarkable morbidity with a significant effect on the quality of life and a high sanitary cost. The management of these wounds requires complex actions such as surgical debris, antibiotic treatment, dressings and even revascularization. These wounds are...

The introduction of invasive species can lead to significant adverse effects on the colonized areas. The aim of the present research was to determine if the invasive behavior of Paraleucilla magna could induce the activation of the antioxidant defences in the native red algae, Peyssonnelia squamaria. Individuals of isolated P. squamaria and individ...

The conventional therapies for cancer have a major concern of poor accessibility to tumor tissues. Furthermore, the requirement of higher doses and non-selective nature of therapeutic are associated with a range of adverse drug reactions (ADRs). However, flavonoids are documented to be effective against various types of cancer, but they are not eva...

In addition to protecting body from infections and diseases, the immune system produces auto-antibodies that can cause complex autoimmune disorders, such as Type I diabetes, primary biliary cirrhosis, rheumatoid arthritis, and multiple sclerosis, to name a few. In such cases, the immune system fails to recognize between foreign agents and its own b...

Traditional Mediterranean diet includes the halophyte Crithmum maritimum L. (Apiaceae) which can be found in coastline of the Balearic Islands but also inland. Both areas differed in the environmental conditions, mainly in salinity which can affect the oxidative status of this species. The aim was to evaluate the antioxidant enzyme activities, poly...

In press

Scorpaena scrofa is one of the most valuable species for artisanal fishing in the Mediterranean Sea. So that, fishing stress and survival of small specimens of S. scrofa were analysed from fishing line, nets and trawling. Nets and fishing lines were the most effective for the capture of biggest individuals of S. scrofa. Mortality after 24h by net f...

Microplastics are tiny ubiquitous plastic particles present in marine environments. They are not an individual entity, but constitute a cocktail of polymers and additives that can absorb substances from the surrounding environment, including living substances, nutrients and marine pollutants. Given their small size (< 5 μm), microplastics can be in...

Marine recovery centers are meant to be crucial to increase the knowledge of endangered species and assess conservation and management policies. The aim of the present study was to investigate the physiological evolution of Caretta caretta specimens -that have entered the Palma Aquarium (the Balearic Islands reference recovery centre for marine spe...

The ubiquitin-proteasome pathway (UPP) is the main non-lysosomal proteolytic system responsible for degradation of most intracellular proteins, specifically damaged and regulatory proteins. The UPP is implicated in all aspects of the cellular metabolic networks including physiological or pathological conditions. Alterations in the components of the...

Inflammation plays a crucial role in the development of many complex diseases and disorders including autoimmune diseases, metabolic syndrome, neurodegenerative diseases, and cardiovascular pathologies. Prostaglandins play a regulatory role in inflammation. Cyclooxygenases are the main mediators of inflammation by catalyzing the initial step of ara...

Depression, a multifactorial brain disorder, is one of the most prevalent diseases worldwide. Several strategies have been developed to counteract the main symptoms and disorders. However, the treatments are usually associated with different side effects or poor effect. For that reason, new necessary approaches are emerging; among them, natural pro...

The benefits of the Mediterranean diet for protecting against many diseases are usually attributed to high consumption of certain foods, characterized by the presence of bioactive substances such as polyphenols. Citrus fruits, which are cultivated and consumed worldwide, are typical products of the Mediterranean diet. Inflammation plays an importan...

Alzheimer's disease is an increasing neurodegenerative pathology related to age in many societies. Some aspects of the disease are related to the loss of neuronal cells derived by the formation of extracellular neuritic plaques and the appearance of intracellular neurofibrillary tangles, altogether generate a inflammatory and oxidative status. The...

The use of sunscreens to protect against ultraviolet radiation exposure progressively increases as result of a greater awareness of the people and the greater arrival of tourists. The components of these creams can end up in the waters affecting coastal species. Mediterranean mussels (Mytillus galloprovincialis) were subjected to an acute exposure...

A total of 417 striped red mullet, Mullus surmuletus, were analyzed to study microplastic ingestion and livers of fish were assessed to study effects of microplastics. Nearly one third (27.30%) of the individuals were quantified to ingest microplastics although there was no evidence of oxidative stress or cellular damage in the liver of fish which...

Background The benefits of the Mediterranean diet for protecting against many diseases are usually attributed to high consumption of certain foods, characterized by the presence of bioactive substances such as polyphenols. Inflammation plays an important role in the pathogenesis of numerous diseases such as arthritis, allergies or neurodegenerative...

Cardiovascular disease (CVD) represents a global burden with a prevalence that continues increasing progressively. CVD comprises a group of disorders of the heart and blood vessels including coronary heart disease, cerebrovascular disease and peripheral arterial disease. This group of disorders is associated with an inflammatory process which can p...

Cytoreductive surgery plus intraperitoneal hyperthermic chemotherapy (HIPEC) has recently been established as the treatment of choice for selected patients with peritoneal carcinomatosis of colonic origin. Until recently, the simultaneous presence of peritoneal and hepatic dissemination has been considered a contraindication for surgery. The aim of...

Introduction: Cytoreductive surgery plus intraperitoneal hyperthermic chemotherapy (HIPEC) has recently been established as the treatment of choice for selected patients with peritoneal carcinomatosis of colonic origin. Until recently, the simultaneous presence of peritoneal and hepatic dissemination has been considered a contraindication for surg...

Quercetin is a natural polyphenolic flavonoid, mainly present as quercetin glycosides. It is found in a wide variety of fruits, vegetables, wines and teas. Quercetin has shown a variety of biologic activities including antioxidant, anti-carcinogenic, anti-inflammatory, cardioprotective and a susceptibility reduction to viral infection. It is well e...

Background: The Mediterranean diet includes olive oil as its primary source of fat. This diet is frequently associated to longevity and a lower incidence of chronic diseases due to its biological activities and health effects. Apart from oleic acid, olive oil contains many bioactive components including polyphenols that have been reported to exert...

Background: Neurodegenerative diseases are increasingly inevitable as the population gets older, with enormous socio-economic costs. The World Health Organization (WHO) has reported that by 2040, neurodegenerative diseases will overtake cancer to become the second leading cause of death, after cardiovascular disease. Objective: Herein, this revi...

The presence of predators induces physiological stress responses in preys to avoid being captured. A stressful situation enhances reactive oxygen species production with potential damage to macromolecules and alterations in oxidant defences levels. The antioxidant enzyme response of the endemic Majorcan Midwife toad (Alytes muletensis) and the Bale...

We analyzed the effects of the clinical hyperbaric oxygen therapy (HBOT) on the plasma antioxidant response and levels of endothelin-1, Interleukine-6 (IL-6) and vascular endothelial growth factor (VEGF) in patients with chronic wounds (20.2±10.0 months without healing). They received 20 HBOT sessions (five sessions/week), and blood samples were ob...

Cardiovascular disease is the main cause of death in the developed countries. Dyslipidaemia is one of the risk factors associated to cardiovascular disease and it is characterised by abnormal amounts of lipids (i.e. cholesterol and fatty acids) and/or circulating lipoproteins in blood. Oxidative stress has been implicated in the pathogenesis of var...

Alzheimer's disease (AD) is an age-associated neurodegenerative amyloid disease and is considered a social and clinical problem the last decades, particularly in the Western countries. Amyloid diseases are characterized by the deposition of typically aggregated protein/peptides in tissues that are associated with brain degeneration and progressive...

Wound healing is a complex process that consists of several phases that range from coagulation, inflammation, accumulation of radical substances, to proliferation, formation of fibrous tissues and collagen, contraction of wound with formation of granulation tissue and scar. Since antiquity, vegetable substances have been used as phytotherapeutic ag...

Background: At present, much attention has been focused on the beneficial effects of natural products on the human health due to their high efficacy and low adverse effects. Among them, polyphenolic compounds are known as one of the most important and common classes of natural products which possess multiple range of health-promotion effects inclu...

The prevalence of mental diseases, especially neurodegenerative disorders, is ever-increasing, while treatment options for such disorders are limited and insufficient. In this scarcity of available medication, it is a feasible strategy to search for potential drugs among natural compounds, such as those found in plants. One such plant source is the...

Caulerpenyne is the main secondary metabolite synthesized by the Caulerpa green marine algae family (Ulvophyceae, Caulerpales). Caulerpenyne is a sesquiterpene containing a bis-enol acetate group, which is proposed to be the responsible of its biological actions. In an ecological context, caulerpenyne inhibits the microorganisms growth, interferes...

Markers of oxidative stress in the hepatopancreas and carotenoid and vitamin E content in the carapace of the invasive crab Percnon gibbesi and the native crab Pachygrapsus marmoratus were compared as indicators of their physiological condition and environmental adaptation. Crabs similar in size were collected from coastal waters of Portals Vells (...

Background: Enhanced recovery after surgery (ERAS) has demonstrated in colorectal surgery a reduction in morbidity and length of stay without compromising security. Experience with ERAS programs in pancreatoduodenectomy (PD) is still limited. The aims of this study were first to evaluate the applicability of an ERAS program for PD patients in our...

In the Mediterranean Sea, Posidonia oceanica is the main seagrass meadow that brings food and shelter to many species. The P. oceanica deterioration is an indicator of its own status, since it is sensitive to many disturbances, such as human impacts or alien species. Lately, oxidative stress has been pointed out as another possible biomarker of the...

The variegated scallop (Chlamys varia L.) is an important economic resource in the aquaculture sector in Spain. The aim of the present study was to determine the oxidative status of C. varia, exposed to anthropogenic activities in waters of the Mallorca Island (Western Mediterranean). Specimens were collected from two locations attending to a diffe...

Several biomarkers were determined to evaluate the effects of the Don Pedro spillage on the digestive gland of the fan mussel Pinna nobilis (Linnaeus, 1758). Two areas in the southeast of Ibiza Island (Western Mediterranean) were selected; one affected by the oil spill (Talamanca) and one did not affected (Espardell). Mussels were sampled one, six...

Enhanced recovery after surgery (ERAS) has demonstrated in colorectal surgery a reduction in morbidity and length of stay without compromising security. Experience with ERAS programs in pancreatoduodenectomy (PD) is still limited.

Rebound growth after hemiepiphysiodesis may be a normal event, but little is known about its causes, incidence or factors related to its intensity. The aim of this study was to evaluate rebound growth under controlled experimental conditions. A total of 22 six-week-old rabbits underwent a medial proximal tibial hemiepiphysiodesis using a two-hole p...

Traditional systems of hemiepiphysiodesis are based on the application of asymmetrical compression to the physis to correct angular deformities. The guided growth method claims to act as a tension plate avoiding compression. The aim of this study was to confirm or refute this claim. Twenty-four White New Zealand rabbits were subjected to a proximal...

Polyphenols are an extensive group of substances present in plants. Animals and humans achieve them through the diet. Polyphenols have been related to several processes, such as oxidative stress and signaling pathways modulating gene expression that promote an anti-inflammatory environment. Moreover, polyphenols also have a possible role in the pro...

Moderate physical exercise leads the organism to adapt to this stressful situation. However, when exercise is exhaustive, it is also known to induce an overproduction of reactive species which can result in oxidative damage to macromolecules and tissues. Many studies have been carried out to evaluate the validity of dietary strategies or micronutri...

Objective: To evaluate the response of the brown alga Dictyota dichotoma (D. dichotoma) epiphytized by the red alga Lophocladia lallemandii in Mallorca coastal waters (Balearic Islands) by means of biomarker measures. Methods: Samples of epiphytized and non-epiphytized D. dichotoma were collected in Cala Morlanda (East Mallorca, Balearic Islands)....

Natural orifice transumbilical endoscopic surgery (NOTES) is a technique still in experimental development that requires clinical trials to assess its safety and efficacy. We present a pilot prospective, randomized, three-arm clinical trial of 1-year duration that was conducted as a noninferiority trial comparing single-incision laparoscopic surger...

Invasive algae alter the structure and function of ecosystems. The green alga Caulerpa taxifolia is an invasive alga introduced in the Mediterranean Sea, whereas Caulerpa prolifera is a native species in Mediterranean waters. The aim of the current work was to determine the oxidative status of both Caulerpa species by means of biomarker measures as...

Metals are major pollutants in the industrial world causing long-term effects on marine ecosystems. Bivalves are widely used as sentinel species for monitoring coastal environments because they have a large capacity to accumulate pollutants in their tissues to a degree that is suitable for measurement. Our aim was to compare the metal bioaccumulati...

: During the last few years, the use of the 8-plate as a technique for hemiepiphysiodesis has gained wide acceptance, as it has been shown that it works in a more physiological way than other methods such as staples or transphyseal screws. It has mechanically been compared with a tension band plate, and for this reason, only a single plate is neede...

Background: The appearance of the 8-plate as a method for hemiepiphysiodesis has renewed the interest for the use of this technique. However, many questions remain unanswered about the way of action of the guided growth method. Although screw length has been said to play no role, to our knowledge, no clinical or experimental evidence exists. Meth...

Cholinergic systems play a significant role in regulating a variety of behavioral functions in mammals and birds. The aim of this work is to study the effects of the muscarinic agonist pilocarpine on behavioral states by visual inspection and electroencephalographic recording; also, locomotor activity was continuously recorded by infrared interrupt...

Marine pollution and water quality are evaluated on direct measurements of the abiotic variables and also on bioaccumulation measurements of chemical contaminants in marine organisms. Measuring the same biomarkers in different localities simultaneously gives information about the pollution states and provides a better comprehension of the mechanist...

In the present work, the potential use of several antioxidant and detoxification biomarkers in the digestive gland of wild mussels (Mytilus galloprovincialis) for biomonitoring the marine pollution induced by the Don Pedro oil spill has been investigated. Two locations from the East to South-East of Eivissa (Ibiza) and Formentera islands were selec...

Serotonergic system is implicated on sleep-waking states in mammals. Since studies on serotonin regulation of sleep in birds are scarce, ring dove was chosen as experimental subject in the present work. The role of the neurotransmitter serotonin on vigilance states was studied in ring doves intraperitoneally treated with the 5-HT(1A) agonist 8-OH-D...

Thus far, most hypotheses on the evolutionary origin of sleep only addressed the probable origin of its main states, REM and NREM. Our article presents the origin of the whole continuum of mammalian vigilance states including waking, sleep and hibernation and the causes of the alternation NREM-REM in a sleeping episode. We propose: (1) the active s...

Pinna nobilis and its guests Pontonia pinnophylax and Nepinnotheres pinnotheres were sampled from Posidonia oceanica meadows invaded and non-invaded by the red alga Lophocladia lallemandii. Uunderstanding the interactions among native and invasive species was the primary aim. Therefore, the effects of the invasive L. lallemandii on the percentage c...

The muscarinic agonist pilocarpine has been shown to increase the duration and total number of episodes presenting theta rhythm-simultaneously in hippocampus and cortex-in rats during the waking states. Theta waves are suggested to be involved in the flow of information between hippocampus and cortex during memory processes. This work investigates...

Metal concentrations and isotopic composition were measured in different tissues of the mussel Mytilus galloprovincialis in waters of the Balearic Islands (Western Mediterranean) in order to assess pollution levels. The isotopic composition was correlated with lead, cadmium, selenium and nickel obtained from the digestive gland and foot of the muss...

Mytilus galloprovincialis is a common species in the Mediterranean. It is a sedentary filter-feeding organism that assimilates carbon and nitrogen isotopic ratios in tissues from its food sources. The δ13C and δ15N values have been used to demonstrate differences in isotopic composition between digestive gland, muscle and gills of this mussel. For...