Alberto Nájera López

• Doctor of Philosophy
• Professor at University of Castilla-La Mancha

Background The main objective of the present study was to analyze both clinical characteristics and evolution during hospitalization of a cohort of patients admitted for COVID-19 pneumonia who were not vaccinated, or with a complete or incomplete vaccination schedule. Methods This COVID-19 specialized single-center cohort study of 1888 COVID-19 pa...

We live in a global pandemic caused by the COVID-19 disease where severe social distancing measures are necessary. Some of these measures have been taken into account by the administrative boundaries within cities (neighborhoods, postal districts, etc.). However, considering only administrative boundaries in decision making can prove imprecise, and...

SARS-CoV-2 is a new coronavirus that has caused a worldwide pandemic. It causes severe acute respiratory syndrome (COVID-19), which is fatal in many cases, and is characterized by a cytokine release syndrome (CRS). Great efforts are currently being made to block the signal transduction pathway of pro-inflammatory cytokines in order to control this...

Background: In recent years, radiofrequency electromagnetic fields (RF-EMF) exposure has increased owing to new communication technologies. Simultaneously, increased exposure to RF-EMF has led to society's growing concern about the possible effects they may have on human health. Many studies have described personal RF-EMF exposure by using persona...

Several studies have characterized personal exposure to RF-EMF, which allows possible effects on health to be studied. All equipment has a detection limit, below which we obtain nondetects or censored data. This problem is a challenge for researchers as it makes the analysis of such data complex. We suggest reconsidering the statistical protocols o...

COVID-19 pandemic, caused by the novel SARS-CoV-2 virus, has raised significant interest in understanding potential cross-immunity mechanisms. Recent evidence suggests that T-cells associated with common cold coronaviruses (229E, NL63, OC43, HKU1) may provide some level of cross-immunity against SARS-CoV-2. It is also known that the prevalence of s...

Background The functional-cognitive impact of first-episode psychosis (FEP) is extremely relevant and implies dysfunction from early life stages like adolescence and youth. Like other illnesses, FEP incidence is also influenced by environmental factors. It is necessary to attend to this age group with early interventions and to act on the environme...

Introduction: Recent evidence shows that a cross-immunity reaction exists between the T-cells associated with common cold coronaviruses (229E, NL63, OC43, HKU1) and SARS-CoV-2, the causal agent of COVID-19. It is also known that the prevalence of smokers among patients admitted to hospital for COVID-19 is lower than expected according to the corres...

Background The functional-cognitive impact of first-episode psychosis (FEP) is extremely relevant and implies dysfunction from early life stages like adolescence and youth. Like other illnesses, FEP incidence is also influenced by environmental factors. It is necessary to attend to this age group with early interventions and to act on the environme...

Introduction: Non invasive respiratory support (NIRS) is useful for treating acute respiratory distress syndrome (ARDS) secondary to COVID-19, mainly in mild-moderate stages. Although continuous positive airway pressure (CPAP) seems superior to other NIRS, prolonged periods of use and poor adaptation may contribute to its failure. The combination...

Introduction: As patients seek health information more frequently on the internet, the impact on their health status and their relationship with doctors could be a matter of concern. The objective of this study is to know how frequently rural primary care patients seek health information on the internet and the factors associated with it. Methods...

This is a reply to the comment by Ivan Berlin and Daniel Thomas on our recently published work [...]

SARS-CoV-2 is a new coronavirus that has caused a worldwide pandemic. It produces severe acute respiratory disease (COVID-19), which is fatal in many cases, characterised by the cytokine release syndrome (CRS). According to the World Health Organization, those who smoke are likely to be more vulnerable to infection. Here, in order to clarify the ep...

SARS-CoV-2 is a new coronavirus that has caused a worldwide pandemic. It produces severe acute respiratory disease (COVID-19), which is fatal in many cases, characterised by cytokine release syndrome (CRS). According to the World Health Organization (WHO), those who smoke are likely to be more vulnerable to infection. Here, in order to clarify the...

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

In the last decades, exposure to radiofrequency electromagnetic fields (RF-EMF) has substantially increased as new wireless technologies have been introduced. Society has become more concerned about the possible effects of RF-EMF on human health in parallel to the increase in their exposure. The appearance of personal exposimeters opens up wide-ran...

Estudio sobre efectos constatados y percepción del Cambio Climático en el medio rural de Castilla-La Mancha, con el objeto de disponer de una base sólida y rigurosa, construida con la opinión de expertos en diferentes campos, que aportando su visión cualificada sobre este suceso, constituyan la base sobre la que construir las decisiones políticas f...

This correspondence refers to the Environmental Research article by Martin L. Pall entitled "Wi-Fi is an important threat to human health". Author presented a biased review about 7 potential effects of Wi-Fi exposure. Most of articles cited are in vitro or in animals and lab conditions, not in humans. In this letter to the editor I analyse the arti...

Objectives: Based on the criteria of a group of experts, this study aims to select a set of functional performance tests which can be applied to evaluate the functional status of a football player in the recovery process and make a decision in relation to their return to practice. Materials and methods: A total of 16 experts were selected by the...

Simultaneously with the increase of Radiofrequency Electromagnetic Fields (RF-EMF) in recent decades, there has been increasing concern about their potential relation with the etiology of several tumors. At this time, the techniques of spatial data analysis jointly with the study of the personal exposure to these fields offer a new approach to the...

The hippocampus plays a critical role in learning and memory. Its correct performance relies on excitatory/inhibitory synaptic transmission balance. In early stages of Alzheimer’s disease (AD), neuronal hyperexcitability leads to network dysfunction observed in cortical regions such as the hippocampus. G-protein-gated potassium (GirK) channels indu...

Background. Sports injuries, in addition to the economic cost which they incur for football clubs, appear to be linked to a worse collective performance during the season. Objectives. The aim of this study was to determine the injury incidence in a professional football team during 4 consecutive seasons. Methods. A total of 109 football players age...

In recent years, numerous epidemiological studies, which deal with the potential effects of mobile phone antennas on health, have almost exclusively focused on their distance to mobile phone base stations. Although it is known that this is not the best approach to the problem, this situation occurs due to the numerous difficulties when determining...

Teachers are deeply concerned on how to be more effective in our task of teaching. We must organize the contents of our specific area providing them with a logical configuration, for which we must know the mental structure of the students that we have in the classroom. We must shape this mental structure, in a progressive manner, so that they can a...

We believe we are at the beginning of a new Big Bang. This great explosion places us at the dawn of a new era in learning Physics, and we would like to participate in this fascinating process. Mobile devices are exponentially growing amongst our students, so we are convinced that they must be used to promote active learning. In this work, we will f...

This is a reply to the comment by Iqbal and Anwar on our recently published work First of all, the authors of ‘Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses’ [1] greatly appreciate the comments of Iqbal and Anwar.

In this work, we propose an inexpensive laboratory practice for an introductory physics course laboratory for any grade of science and engineering study. This practice was very well received by our students, where a smartphone (iOS, Android, or Windows) is used together with mini magnets (similar to those used on refrigerator doors), a 20 cm long s...

During the last decade, several studies have characterized personal exposition to non-ionizing electromagnetic fields using personal portable exposimeters with a very high resolution. 76 volunteers participated in a study in the city of Albacete (Spain) measuring during 24 hours, every 10 seconds and doing normal life. We geolocalized every measure...

Purpose – Since first small personal exposimeters became available, some studies have characterized personal exposition to radio frequency electromagnetic fields. The effect of body and relative position of the exposimeter have been also analyzed but some questions are still unanswered. The paper aims to discuss these issues. Design/methodology/ap...

Neste artigo mostraremos o conjunto de experimentos simples no laboratorio. Este irá descrever os fenómenos da indução eletromagnética. O dispositivo experimental é análogo a um transformador e está formado por duas bobinas magnéticas acopladas e conectadas a um gerador de corrente senoidal alternada de frequência váriavel. Mediremos as tensões ind...

Who has not experienced the formation of a vortex or a whirlpool in a glass of milk when trying to dissolve cocoa in it by stirring the liquid with a spoon? In this paper, we analyse the mechanical aspects of the unsteady vortex formed in swirling water that was stirred with a spoon around a central axis in a cylindrical glass. We show that the for...

Who has not experienced the formation of a vortex or a whirlpool in a glass of milk when trying to dissolve cocoa in it by stirring the liquid with a spoon? In this paper, we analyse the mechanical aspects of the unsteady vortex formed in swirling water that was stirred with a spoon around a central axis in a cylindrical glass. We show that the for...

The aim of this study is to evaluate the relationship between the risk of hospital admission for respiratory diseases (RD) and the daily weather types during the period 2000-2006. A synoptic climatological approach is used to investigate links between air-mass types (weather situations) and all respiratory hospital admissions in the Castilla-La Man...

Accurate approximate closed-form solutions for the cubic-quintic Duffing oscillator are obtained in terms of elementary functions. To do this, we use the previous results obtained using a cubication method in which the restoring force is expanded in Chebyshev polynomials and the original nonlinear differential equation is approximated by a cubic Du...

The use of innovative technologies in education offers new possibilities that complement classroom teaching and may also help to improve the quality of education, enabling students to actively participate in the learning process. With this in mind, in 2009 the University of Alicante (UA) created a program to promote technological and educational in...

Mediante el uso de diversas bobinas, tres polímetros, un generador de funciones, núcleos de hierro y cables, se pretende ilustrar de forma sencilla el fenómeno de la inducción electromagnética. Para ello se mide la diferencia de potencial en el primario y en el secundario, variando el número de espiras del secundario y manteniendo fijo el número de...

To investigate the level of hearing loss and the configuration of the mean audiometric curve over the course of Menière's disease, correcting the data according to patient age. A retrospective study of 3,963 hearing tests. Descriptive, longitudinal study of pure-tone audiometries of 237 patients at a tertiary hospital who had been diagnosed with de...

The Faculty of Medicine at University of Castilla-La Mancha (UCLM) started in 1998 an innovative method of teaching and learning. Students are divided into groups of 25 people maximum, and they are told to teach their classmates all concepts suggested by their teachers, generally using multimedia presentations. During these sessions, the teachers h...

Taking as starting point the complete analysis of mean residence times in linear compartmental systems performed by Garcia-Meseguer et al. (Bull. Math. Biol. 65:279-308, 2003) as well as the fact that enzyme systems, in which the interconversions between the different enzyme species involved are of first or pseudofirst order, act as linear compartm...

A number of phenomenological models that simulate the response of the basilar membrane motion can reproduce a range of complex features observed in animal measurements over different sites along its cochlea. The present report shows a detailed analysis of the responses to tones of an improved model based on a dual-resonance nonlinear filter. The im...

We examined the possible relationships between pollutant concentrations and mortality at seven different locations of Castilla-León, Spain, and the relationships between such concentration levels and emergency admissions (morbidity) at four hospitals in the region, taking into account the possible masking effect of other atmospheric variables. The...

A dual-resonance nonlinear (DRNL) filter [Meddis et al., J. Acoust. Soc. Am. 106, 2852-2861 (2001)] was fitted to model chinchilla cochlear responses to tonal stimuli at individual sites along the basilar membrane (BM) with best frequencies (BF) of 0.8, 5.5, 7.25, 9.75, 10.0, 12.0, and 14.0 kHz. At each BF, parameters were obtained for the DRNL fil...

Several new studies published over the past decade have demonstrated a link between ambient air pollution and several adverse effects on human health even at the lower concentrations typically observed in North America and Europe today, suggesting that air pollution may pose a risk to public health. The effects on human health of gaseous air pollut...