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1.
Aging Ment Health ; 26(7): 1395-1416, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-34378453

RESUMEN

OBJECTIVES: The objective of this study was to explore the experiences and feelings of older adults with MCI during the COVID-19 outbreak in Chile and to know what strategies they used to overcome social isolation. METHOD: A qualitative design was used. Ten participants with a diagnosis of MCI took part in this study. All interviews were recorded and coded using thematic analysis. RESULTS: The thematic analysis identified three themes related to the quarantine experience of older adults with MCI diagnosis: (1) Effects of social isolation during the COVID-19 pandemic (2) Believes, feelings and behaviors about the SARS-CoV-2 virus (3) Coping with social isolation/response to difficulties during the pandemic. It was found that older adults with MCI have been mainly psychologically and socially affected by social distancing and isolation, particularly individuals who were alone during COVID-19 outbreak. The only physical dimension negatively affected was the level of activity. Social isolation led to a significant number of negative emotions such as anger, fear of contracting the virus or possibility of contagion for their families, worries and sadness as well as emotional loneliness. It is noteworthy that the majority of participants have used several coping strategies during this challenging time. CONCLUSION: Since social isolation and a sedentary life have been associated with poorer cognition and functionality in people with MCI, a rational plan to both prevent the progression of cognitive decline and to increase social contact, is essential. Special attention must be drawn to maintaining people physically active at home and keeping their daily routine (within the possibilities) and also to ensure social connectedness through technology. Implementation of these measures could potentially reduce negative emotions during the pandemic.


Asunto(s)
Adaptación Psicológica , COVID-19/epidemiología , Disfunción Cognitiva/psicología , Aislamiento Social/psicología , Anciano , COVID-19/psicología , Disfunción Cognitiva/epidemiología , Humanos , Entrevistas como Asunto , Pandemias , SARS-CoV-2 , Participación Social/psicología
2.
Respir Res ; 21(1): 236, 2020 Sep 16.
Artículo en Inglés | MEDLINE | ID: mdl-32938445

RESUMEN

BACKGROUND: Spontaneous pneumothorax is an uncommon complication of COVID-19 viral pneumonia. The exact incidence and risk factors are still unknown. Herein we review the incidence and outcomes of pneumothorax in over 3000 patients admitted to our institution for suspected COVID-19 pneumonia. METHODS: We performed a retrospective review of COVID-19 cases admitted to our hospital. Patients who were diagnosed with a spontaneous pneumothorax were identified to calculate the incidence of this event. Their clinical characteristics were thoroughly documented. Data regarding their clinical outcomes were gathered. Each case was presented as a brief synopsis. RESULTS: Three thousand three hundred sixty-eight patients were admitted to our institution between March 1st, 2020 and June 8th, 2020 for suspected COVID 19 pneumonia, 902 patients were nasopharyngeal swab positive. Six cases of COVID-19 patients who developed spontaneous pneumothorax were identified (0.66%). Their baseline imaging showed diffuse bilateral ground-glass opacities and consolidations, mostly in the posterior and peripheral lung regions. 4/6 cases were associated with mechanical ventilation. All patients required placement of a chest tube. In all cases, mortality (66.6%) was not directly related to the pneumothorax. CONCLUSION: Spontaneous pneumothorax is a rare complication of COVID-19 viral pneumonia and may occur in the absence of mechanical ventilation. Clinicians should be vigilant about the diagnosis and treatment of this complication.


Asunto(s)
Infecciones por Coronavirus/epidemiología , Neumonía Viral/epidemiología , Neumotórax/epidemiología , Anciano , Anciano de 80 o más Años , Betacoronavirus/patogenicidad , COVID-19 , Causas de Muerte , Infecciones por Coronavirus/diagnóstico , Infecciones por Coronavirus/terapia , Infecciones por Coronavirus/virología , Resultado Fatal , Femenino , Interacciones Huésped-Patógeno , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Pandemias , Philadelphia/epidemiología , Neumonía Viral/diagnóstico , Neumonía Viral/terapia , Neumonía Viral/virología , Neumotórax/diagnóstico , Neumotórax/terapia , Neumotórax/virología , Estudios Retrospectivos , Factores de Riesgo , SARS-CoV-2 , Factores de Tiempo , Resultado del Tratamiento
3.
Neurosurg Focus ; 48(4): E15, 2020 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-32234995

RESUMEN

OBJECTIVE: Generalized-onset seizures are usually conceptualized as engaging bilaterally distributed networks with no clear focus. However, the authors previously reported a case series demonstrating that in some patients with generalized-onset seizures, focal seizure onset could be discovered after corpus callosotomy. The corpus callosum is considered to be a major pathway for seizure generalization in this group of patients. The authors hypothesized that, in patients with generalized-onset seizures, the structure of the corpus callosum could be different between patients who have lateralized seizures and those who have nonlateralized seizures after corpus callosotomy. The authors aimed to evaluate the structural difference through statistical analysis of diffusion tensor imaging (DTI) scalars between these two groups of patients. METHODS: Thirty-two patients diagnosed with generalized-onset motor seizures and without an MRI lesion were included in this study. Among them, 16 patients developed lateralized epileptic activities after corpus callosotomy, and the remaining 16 patients continued to have nonlateralized seizures after corpus callosotomy. Presurgical DTI studies were acquired to quantify the structural integrity of the corpus callosum. RESULTS: The DTI analysis showed significant reduction of fractional anisotropy (FA) and increase in radial diffusivity (RD) in the body of the corpus callosum in the lateralized group compared with the nonlateralized group. CONCLUSIONS: The authors' findings indicate the existence of different configurations of bilateral epileptic networks in generalized epilepsy. Generalized seizures with focal onset relying on rapid spread through the corpus callosum might cause more structural damage related to demyelination in the corpus callosum, showing reduced FA and increased RD. This study suggests that presurgical DTI analysis of the corpus callosum might predict the seizure lateralization after corpus callosotomy.


Asunto(s)
Cuerpo Calloso/cirugía , Epilepsia/cirugía , Convulsiones/cirugía , Adolescente , Adulto , Niño , Imagen de Difusión Tensora/métodos , Epilepsia Generalizada/patología , Epilepsia Generalizada/cirugía , Femenino , Humanos , Imagen por Resonancia Magnética/métodos , Masculino , Psicocirugía/métodos , Adulto Joven
4.
Neuroimage ; 197: 439-449, 2019 08 15.
Artículo en Inglés | MEDLINE | ID: mdl-31059796

RESUMEN

Research on how the brain construes meaning during language use has prompted two conflicting accounts. According to the 'grounded view', word understanding involves quick reactivations of sensorimotor (embodied) experiences evoked by the stimuli, with simultaneous or later engagement of multimodal (conceptual) systems integrating information from various sensory streams. Contrariwise, for the 'symbolic view', this capacity depends crucially on multimodal operations, with embodied systems playing epiphenomenal roles after comprehension. To test these contradictory hypotheses, the present magnetoencephalography study assessed implicit semantic access to grammatically constrained action and non-action verbs (n = 100 per category) while measuring spatiotemporally precise signals from the primary motor cortex (M1, a core region subserving bodily movements) and the anterior temporal lobe (ATL, a putative multimodal semantic hub). Convergent evidence from sensor- and source-level analyses revealed that increased modulations for action verbs occurred earlier in M1 (∼130-190 ms) than in specific ATL hubs (∼250-410 ms). Moreover, machine-learning decoding showed that trial-by-trial classification peaks emerged faster in M1 (∼100-175 ms) than in the ATL (∼345-500 ms), with over 71% accuracy in both cases. Considering their latencies, these results challenge the 'symbolic view' and its implication that sensorimotor mechanisms play only secondary roles in semantic processing. Instead, our findings support the 'grounded view', showing that early semantic effects are critically driven by embodied reactivations and that these cannot be reduced to post-comprehension epiphenomena, even when words are individually classified. Briefly, our study offers non-trivial insights to constrain fine-grained models of language and understand how meaning unfolds in neural time.


Asunto(s)
Lenguaje , Corteza Motora/fisiología , Semántica , Percepción del Habla/fisiología , Lóbulo Temporal/fisiología , Adulto , Femenino , Humanos , Aprendizaje Automático , Magnetoencefalografía , Masculino , Factores de Tiempo , Adulto Joven
5.
Brain Topogr ; 29(5): 728-37, 2016 09.
Artículo en Inglés | MEDLINE | ID: mdl-27142358

RESUMEN

Simultaneous bilateral onset and bi-synchrony epileptiform discharges in electroencephalogram (EEG) remain hallmarks for generalized seizures. However, the possibility of an epileptogenic focus triggering rapidly generalized epileptiform discharges has been documented in several studies. Previously, a new multi-stage surgical procedure using bilateral intracranial EEG (iEEG) prior to and post complete corpus callosotomy (CC) was developed to uncover seizure focus in non-lateralizing focal epilepsy. Five patients with drug-resistant generalized epilepsy who underwent this procedure were included in the study. Their bilateral iEEG findings prior to complete CC showed generalized epileptiform discharges with no clear lateralization. Nonetheless, the bilateral ictal iEEG findings post complete CC indicated lateralized or localized seizure onset. This study hypothesized that brain functional connectivity analysis, applied to the pre CC bilateral iEEG recordings, could help identify focal epileptogenic networks in generalized epilepsy. The results indicated that despite diffuse epileptiform discharges, focal features can still be observed in apparent generalized seizures through brain connectivity analysis. The seizure onset localization/lateralization from connectivity analysis demonstrated a good agreement with the bilateral iEEG findings post complete CC and final surgical outcomes. Our study supports the role of focal epileptic networks in generalized seizures.


Asunto(s)
Encéfalo/fisiopatología , Epilepsia Refractaria/fisiopatología , Epilepsias Parciales/fisiopatología , Epilepsia Generalizada/fisiopatología , Niño , Preescolar , Cuerpo Calloso/cirugía , Epilepsia Refractaria/cirugía , Electrocorticografía , Epilepsias Parciales/cirugía , Epilepsia Generalizada/cirugía , Femenino , Humanos , Lactante , Masculino , Vías Nerviosas/fisiopatología
6.
Rev Gastroenterol Peru ; 36(1): 66-70, 2016.
Artículo en Español | MEDLINE | ID: mdl-27131943

RESUMEN

We report a patient who was diagnosed sigmoid colon cancer associated with liver metastases in segment III. The patient underwent laparoscopic surgery where the sigmoid colon resection and hepatic metastasectomy were performed in a â€Å“one staged” surgical procedure. The pathological results showed moderately differentiated tubular adenocarcinoma in sigmoid colon, tubular adenocarcinoma metastases also in liver. Oncological surgical results were obtained with free edges of neoplasia, R0 Surgery, T3N0M1. After the optimal surgical results, the patient is handled by oncology for adjuvant treatment. We report here the sequence of events and a review of the literature.


Asunto(s)
Adenocarcinoma/secundario , Colectomía/métodos , Hepatectomía/métodos , Laparoscopía , Neoplasias Hepáticas/secundario , Metastasectomía/métodos , Neoplasias del Colon Sigmoide/patología , Adenocarcinoma/cirugía , Anciano , Hospitales Públicos , Humanos , Neoplasias Hepáticas/cirugía , Masculino , Perú , Neoplasias del Colon Sigmoide/cirugía
7.
Rev Gastroenterol Peru ; 35(4): 343-8, 2015.
Artículo en Español | MEDLINE | ID: mdl-26802888

RESUMEN

We report the case of a patient who had the initial diagnosis of tumor in the bile duct in the middle third. Patient presented with lost weight of 10 kilograms in two months and moderate epigastric pain, no jaundice. The patient underwent radical surgery of the bile duct with multiple freeze biopsy surgical margins, intraoperative choledochoscopy, intraoperative cholangiography and reconstruction bilioenteric anastomosis Y Roux transmesocolic, he had a great recovery and early discharge. The pathological results showed moderately differentiated tubular adenocarcinoma on the basis of an adenoma. Negatives retroperitoneal, retropancreatic, pericholedochal, lesser curvature and negative hepatic artery nodes, and extension of surgical margins free of neoplasia proximal and distal edges. R0 surgery. pT1N0Mx. Stage 1. After the optimal surgical outcomes, is managed by liver and biliary tract surgery service and medical oncology service for regular monitoring and controls. We present here the sequence of events and a review of the literature.


Asunto(s)
Neoplasias de los Conductos Biliares/cirugía , Conductos Biliares Intrahepáticos/cirugía , Colangiocarcinoma/cirugía , Neoplasias de los Conductos Biliares/diagnóstico , Conductos Biliares Intrahepáticos/diagnóstico por imagen , Colangiocarcinoma/diagnóstico , Femenino , Humanos , Persona de Mediana Edad , Perú
8.
Epilepsia ; 55(5): 629-632, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24815532

RESUMEN

The question we address here is whether the invasive presurgical brain mapping approaches of direct cortical stimulation and of the Wada procedure can be replaced by noninvasive functional neuroimaging methods (functional magnetic resonance imaging [fMRI], magnetoencephalography [MEG], transcranial magnetic stimulation and [TMS]). First, we outline the reasons for contemplating such a replacement. Second, we present evidence to the effect that the efficacy of the invasive and noninvasive methods, while suboptimal, is comparable. Third, we discuss additional advantages of noninvasive presurgical brain mapping and conclude that there are no longer compelling reasons for opting for invasive mapping in many if not most cases provided that the non-invasive methods are available.


Asunto(s)
Amobarbital , Mapeo Encefálico/métodos , Corteza Cerebral/fisiopatología , Craneotomía/métodos , Epilepsia del Lóbulo Temporal/fisiopatología , Epilepsia del Lóbulo Temporal/cirugía , Imagen por Resonancia Magnética , Magnetoencefalografía , Cuidados Preoperatorios , Estimulación Magnética Transcraneal , Amobarbital/administración & dosificación , Arterias Carótidas , Corteza Cerebral/cirugía , Humanos , Inyecciones Intraarteriales , Lenguaje , Memoria/fisiología , Valor Predictivo de las Pruebas , Vigilia/fisiología
9.
Artículo en Inglés | MEDLINE | ID: mdl-38315507

RESUMEN

Objective: To assess the clinical impact of flash glucose monitoring (FGM) systems on fear of hypoglycemia (FoH) and quality of life in adults with type 1 diabetes mellitus (T1DM). Methods: Prospective quasi-experimental study with a 12-month follow-up. People with T1DM (18-80 years old) and self-monitoring by blood capillary glycemia controls were included. The FH15 questionnaire, a survey validated in Spanish in a comparable study population, was used to diagnose FoH with a cutoff point of 28 points. Results: A total of 181 participants were included, with a FoH prevalence of 69% (n = 123). A mean reduction in FH15 score of -4 points (95% confidence interval [-5.5 to -3]; P < 0.001) was observed, along with an improvement in quality of life (EsDQOL-test (Diabetes Quality of Life, Spanish version), -7 points [-10; -4], P < 0.001) and satisfaction with treatment (Diabetes Treatment Satisfaction questionnaire, self-reported version [DTSQ-s] test, +4.5 points [4; 5.5], P < 0.001). At the end of the follow-up, 64.2% of the participants saw an improved FoH intensity, compared to 35.8% who scored the same or higher. This improvement in FoH status was associated with a higher time-in-range at the end of the follow-up (P = 0.003), as well as a lower time spent in hyperglycemia (P = 0.005). In addition, it was linked to participants with a high baseline FoH levels (P < 0.001) and those who were university degree holders (P = 0.07). Conclusions: FGM is associated with an overall reduction of FoH in adults with T1DM and with an increase in their quality of life. Nevertheless, a significant percentage of patients may experience an increase of this phenomenon leading to clinical repercussions and a profound impact on quality of life.

10.
Sports Med ; 2024 Apr 12.
Artículo en Inglés | MEDLINE | ID: mdl-38609697

RESUMEN

OBJECTIVES: The aim of this study was to compare the incidence, severity, and burden of injury in starting and replacement players from professional men's teams of five rugby unions. METHODS: Match injuries of greater than 24 h time-loss (including data on the severity, match quarter, event, body region) and player minutes of match exposure data were collated for all starting and replacement players in the men's English Premiership, Welsh Pro14 (both 2016/17-2018/19 seasons), and Australian, New Zealand, and South African Super Rugby (all 2016-2018 seasons) teams. Injury incidences and mean injury burden (incidence × days missed) were calculated, and rate ratios (RRs) (95% confidence intervals [CIs]) were used to compare injury incidence and burden between starting (reference group) and replacement players. RESULTS: Overall injury incidence was not different between starters and replacements for all injuries (RR = 0.98, 95% CI 0.88-1.10), nor for concussions (RR = 0.85; 95% CI 0.66-1.11). Mean injury burden was higher for replacement players (RR = 1.31, 95% CI 1.17-1.46). Replacement injury incidence was lower than the starters in the third (RR = 0.68, 95% CI 0.51-0.92) and fourth (RR = 0.78, 95% CI 0.67-0.92) match quarters. Injury incidence was not different between starters and replacements for any match event or body region, but compared with starters, replacements' injury burden was higher in lower limbs (RR = 1.24, 95% CI 1.05-1.46) and in the tackled player (RR = 1.30, 95% CI 1.01-1.66). CONCLUSION: This study demonstrated a lower injury incidence in replacement players compared with starters in the second half of matches, with a higher injury burden for replacement players due to higher mean injury severity.

11.
J Dairy Res ; 80(3): 283-90, 2013 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-23663300

RESUMEN

The effect of high-pressure treatment (400, 500 and 650 MPa) on the structure and activity of bovine lactoferrin in different iron-saturation forms has been studied by several techniques. The structural changes produced in lactoferrin by high-pressure were analysed by differential scanning calorimetry and fluorescence spectroscopy, and the immunoreactivity by ELISA. The effect of high-pressure was also studied on some biological properties of lactoferrin, such as iron binding capacity, retention of the bound iron, and antibacterial activity against Escherichia coli O157:H7. Results obtained indicate that treatment at 400 MPa does not substantially modify the conformation of lactoferrin, meanwhile treatments at 500 and 650 MPa greatly affect some of its properties. With respect to the antibacterial activity, the apo and native forms of lactoferrin maintain that activity against Esch. coli only after 400 MPa treatment.


Asunto(s)
Antibacterianos/farmacología , Lactoferrina/farmacología , Animales , Antibacterianos/química , Rastreo Diferencial de Calorimetría , Bovinos , Ensayo de Inmunoadsorción Enzimática , Escherichia coli O157/efectos de los fármacos , Lactoferrina/química , Conformación Molecular , Presión , Espectrometría de Fluorescencia , Relación Estructura-Actividad
12.
Sensors (Basel) ; 13(8): 9941-65, 2013 Aug 05.
Artículo en Inglés | MEDLINE | ID: mdl-23921827

RESUMEN

This paper presents a novel method for the calibration of a parallel robot, which allows a more accurate configuration instead of a configuration based on nominal parameters. It is used, as the main sensor with one camera installed in the robot hand that determines the relative position of the robot with respect to a spherical object fixed in the working area of the robot. The positions of the end effector are related to the incremental positions of resolvers of the robot motors. A kinematic model of the robot is used to find a new group of parameters, which minimizes errors in the kinematic equations. Additionally, properties of the spherical object and intrinsic camera parameters are utilized to model the projection of the object in the image and thereby improve spatial measurements. Finally, several working tests, static and tracking tests are executed in order to verify how the robotic system behaviour improves by using calibrated parameters against nominal parameters. In order to emphasize that, this proposed new method uses neither external nor expensive sensor. That is why new robots are useful in teaching and research activities.


Asunto(s)
Algoritmos , Modelos Teóricos , Fotograbar/instrumentación , Robótica/instrumentación , Transductores , Calibración , Simulación por Computador , Diseño de Equipo , Análisis de Falla de Equipo , Miniaturización , Movimiento (Física)
13.
Biochem Cell Biol ; 90(3): 389-96, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22332867

RESUMEN

Heat denaturation of recombinant human lactoferrin (rhLf) from rice with 3 different iron-saturation degrees, holo rhLf (iron-saturated), AsIs rhLf (60% iron saturation), and apo rhLf (iron-depleted), was studied. The 3 forms of rhLf were subjected to heat treatment, and the kinetic and thermodynamic parameters of the denaturation process were determined. Thermal denaturation of rhLf was assessed by measuring the loss of reactivity against specific antibodies. D(t) values (time to reduce 90% of immunoreactivity) decreased with increasing temperature of treatment for apo and holo rhLf, those values being higher for the iron-saturated form, which indicates that iron confers thermal stability to rhLf. However, AsIs rhLf showed a different behaviour with an increase in resistance to heat between 79 °C and 84 °C, so that the kinetic parameters could not be calculated. The heat denaturation process for apo and holo rhLf was best described assuming a reaction order of 1.5. The activation energy of the denaturation process was 648.20 kJ/mol for holo rhLf and 406.94 kJ/mol for apo rhLf, confirming that iron-depleted rhLf is more sensitive to heat treatment than iron-saturated rhLf.


Asunto(s)
Lactoferrina/química , Desnaturalización Proteica , Anticuerpos/química , Calor , Humanos , Hierro/química , Cinética , Lactoferrina/biosíntesis , Oryza/genética , Oryza/metabolismo , Plantas Modificadas Genéticamente , Unión Proteica , Estabilidad Proteica , Proteínas Recombinantes/biosíntesis , Proteínas Recombinantes/química , Termodinámica
14.
Biosci Biotechnol Biochem ; 76(1): 53-9, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22232242

RESUMEN

High pressure was applied to recombinant human lactoferrin obtained from rice (rhLF) and its effect was evaluated on the structure and activity of the protein. Treatments of 400, 500, and 650 MPa for 15 min (20 °C), were applied to rhLF at 2 mg/mL in three iron-saturation forms. The structural characteristics of the treated proteins were analyzed by differential scanning calorimetry (DSC) and by fluorometric analysis, and immunoreactivity by ELISA. Iron retention and binding properties and antibacterial activity against Escherichia coli O157:H7 were also studied. The results obtained indicate that the treatments at 400 and 500 MPa did not greatly modifiy the conformation of lactoferrin, meanwhile treatment at 650 MPa affected in different degrees the three forms of rhLF. With respect to antibacterial activity, only apo rhLF showed antibacterial activity against E. coli, activity that was maintained after treatment at 400 MPa, while holo and AsIs rhLF did not inhibit the growth of E. coli.


Asunto(s)
Antibacterianos/química , Antibacterianos/farmacología , Lactoferrina/química , Lactoferrina/farmacología , Oryza/genética , Proteínas Recombinantes/química , Proteínas Recombinantes/farmacología , Antibacterianos/metabolismo , Escherichia coli O157/efectos de los fármacos , Humanos , Presión Hidrostática , Hierro/metabolismo , Lactoferrina/metabolismo , Plantas Modificadas Genéticamente , Proteínas Recombinantes/metabolismo
15.
PLoS One ; 17(6): e0270202, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35731741

RESUMEN

In this paper we present the design of an open-source and low-cost buoy prototype for remote monitoring of water quality variables in fish farming. The designed battery-powered system periodically measures temperature, pH and dissolved oxygen, transmitting the information locally through a low-power wide-area network protocol to a gateway connected to a cloud service for data storage and visualization. We provide a novel buoy design that can be easily constructed with off-the-shelf materials, delivering a stable anchored float for the IoT device and the probes immersed in the water pond. The prototype was tested at an operating fish farm, showing promising results for a low-cost remote monitoring tool that enables automatic data acquisition and storage in fish farming scenarios. All the elements of this design, including hardware and software designs, are freely available under permissive licenses as an open-source project.


Asunto(s)
Explotaciones Pesqueras , Calidad del Agua , Nube Computacional
16.
PLoS One ; 16(8): e0256380, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34407149

RESUMEN

Monitoring variables such as dissolved oxygen, pH, and pond temperature is a key aspect of high-quality fish farming. Machine learning (ML) techniques have been proposed to model the dynamics of such variables to improve the fish farmer's decision-making. Most of the research on ML in aquaculture has focused on scenarios where devices for real-time data acquisition, storage, and remote monitoring are available, making it easy to develop accurate ML techniques. However, fish farmers do not necessarily have access to such devices. Many of them prefer to use equipment to manually measure these variables limiting the amount of available data to process. In this work, we study the use of random forests, multivariate linear regression, and artificial neural networks in scenarios with limited amount of measurements to analyze data from water-quality variables that are commonly measured in fish farming. We propose a methodology to build models in two scenarios: i) estimation of unobserved variables based on the observed ones, and ii) forecasting when a low amount of data is available for training. We show that random forests can be used to forecast dissolved oxygen, pond temperature, pH, ammonia, and ammonium when the water pond variables are measured only twice per day. Moreover, we showed that these prediction models can be implemented on a mobile-based information system and run in an average smartphone that fish farmers can afford.


Asunto(s)
Aprendizaje Automático , Calidad del Agua , Agua/química , Amoníaco/análisis , Explotaciones Pesqueras , Concentración de Iones de Hidrógeno , Modelos Lineales , Oxígeno/análisis , Temperatura
17.
Food Chem ; 334: 127603, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-32712492

RESUMEN

Present work comprises the use of different solid-state Nuclear Magnetic Resonance strategies for characterizing structural and motional aspects of the peptide matrix that compose a set of four lyophilized Mexican cheese aqueous soluble extracts, each with a controlled ripening. Heteronuclear dipolar coupling modulation schemes allowed to characterize local mobility and structural homogeneity of cheeses' peptide segments in the solid-state as a function of ripening. Results suggest that ripened samples with certain local flexibility but important structural homogeneity present efficient microbial inhibition against tested bacterial strains, whilst high local rigidity of peptides within ripened cheese soluble fractions could partially explain the observed lack of antimicrobial activity. The present study attempts to propose novel observables for lyophilized cheese water soluble extracts that could be partially associated to their ripening-dependent antimicrobial activities, whereas said observables shall contribute to the better targeting, design and optimization of solid-state natural food bio-preservatives.


Asunto(s)
Antiinfecciosos/química , Antiinfecciosos/farmacología , Queso , Espectroscopía de Resonancia Magnética/métodos , Antiinfecciosos/análisis , Isótopos de Carbono , Queso/análisis , Liofilización , Pruebas de Sensibilidad Microbiana , Péptidos/análisis , Péptidos/química , Péptidos/farmacología , Solubilidad , Agua
18.
J Neurosurg ; 135(3): 751-759, 2020 Dec 11.
Artículo en Inglés | MEDLINE | ID: mdl-33307521

RESUMEN

OBJECTIVE: The goal of this study was to assess the success rate and complications of stereo-electroencephalogra-phy (sEEG) and laser interstitial thermal therapy (LITT) in the treatment of nonlesional refractory epilepsy in cingulate and insular cortex. METHODS: The authors retrospectively analyzed the treatment response in 9 successive patients who underwent insular or cingulate LITT for nonlesional refractory epilepsy at their center between 2011 and 2019. Localization of seizures was based on inpatient video-EEG monitoring, neuropsychological testing, 3-T MRI, PET scan, magnetoencephalography scan, and/or ictal SPECT scan. Eight patients underwent sEEG, and 1 patient had implantation of both sEEG electrodes and subdural grids for localization of epileptogenic zones. LITT was performed in 5 insular cases (4 left and 1 right) and 3 cingulate cases (all left-sided). One patient also underwent both insular and cingulate LITT on the left side. All of the patients who underwent insular LITT as well as 2 of the 3 who underwent cingulate LITT were right-hand dominant. The patient who underwent insular plus cingulate LITT was also right-hand dominant. RESULTS: Following LITT, 67% of the patients were seizure free (Engel class I) at follow-up (mean 1.35 years, range 0.6-2.8 years). All patients responded favorably to treatment (Engel class I-III). Two patients developed small intracranial hemorrhages during the sEEG implantation that did not require surgical management. One patient developed a large intracranial hemorrhage during an insular LITT procedure that did require surgical management. That patient experienced aphasia, incoordination, and hemiparesis, which resolved with inpatient rehabilitation. No permanent neurological deficits were noted in any of the patients at last follow-up. Neuropsychological status was stable in this cohort before and after LITT. CONCLUSIONS: sEEG can be safely used to localize seizures originating from insular and cingulate cortex. LITT can successfully treat seizures arising from these deep-seated structures. The insula and cingulum should be evaluated more frequently for seizure onset zones.

19.
Front Neurosci ; 14: 409, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32435182

RESUMEN

The success of surgical resection in epilepsy patients depends on preserving functionally critical brain regions, while removing pathological tissues. Being the gold standard, electro-cortical stimulation mapping (ESM) helps surgeons in localizing the function of eloquent cortex through electrical stimulation of electrodes placed directly on the cortical brain surface. Due to the potential hazards of ESM, including increased risk of provoked seizures, electrocorticography based functional mapping (ECoG-FM) was introduced as a safer alternative approach. However, ECoG-FM has a low success rate when compared to the ESM. In this study, we address this critical limitation by developing a new algorithm based on deep learning for ECoG-FM and thereby we achieve an accuracy comparable to ESM in identifying eloquent language cortex. In our experiments, with 11 epilepsy patients who underwent presurgical evaluation (through deep learning-based signal analysis on 637 electrodes), our proposed algorithm obtained an accuracy of 83.05% in identifying language regions, an exceptional 23% improvement with respect to the conventional ECoG-FM analysis (∼60%). Our findings have demonstrated, for the first time, that deep learning powered ECoG-FM can serve as a stand-alone modality and avoid likely hazards of the ESM in epilepsy surgery. Hence, reducing the potential for developing post-surgical morbidity in the language function.

20.
CNS Neurol Disord Drug Targets ; 19(2): 148-162, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32303175

RESUMEN

BACKGROUND: Parkinson's Disease (PD) is a common neurodegenerative disorder affecting the dopaminergic (DAergic) system. Replacement therapy is a promising alternative aimed at reconstructing the cytoarchitecture of affected brain regions in PD. Experimental approaches, such as the replacement of DAergic neurons with cells obtained from the Enteric Nervous System (ENS) has yet to be explored. OBJECTIVE: To establish and characterize a cell replacement strategy with ENS Cells (ENSCs) in a PD model in rats. METHODS: Since ENSCs can develop mature DAergic phenotypes, here we cultured undifferentiated cells from the myenteric plexus of newborn rats, establishing that they exhibit multipotential characteristics. These cells were characterized and further implanted in the Substantia nigra pars compacta (SNpc) of adult rats previously lesioned by a retrograde degenerative model produced by intrastriatal injection of 6-Hydroxydopamine (6-OHDA). DAergic markers were assessed in implants to validate their viability and possible differentiation once implanted. RESULTS: Cell cultures were viable, exhibited stem cell features and remained partially undifferentiated until the time of implant. The retrograde lesion induced by 6-OHDA produced DAergic denervation, reducing the number of fibers and cells in the SNpc. Implantation of ENSCs in the SNpc of 6-OHDAlesioned rats was tracked after 5 and 10 days post-implant. During that time, the implant increased selective neuronal and DAergic markers, Including Microtubule-Associated Protein 2 (MAP-2), Dopamine Transporter (DAT), and Tyrosine Hydroxylase (TH). CONCLUSION: Our novel results suggest that ENSCs possess a differentiating, proliferative and restorative potential that may offer therapeutic modalities to attenuate neurodegenerative events with the inherent demise of DAergic neurons.


Asunto(s)
Neuronas Dopaminérgicas/metabolismo , Células-Madre Neurales/trasplante , Enfermedad de Parkinson/terapia , Trasplante de Células Madre/métodos , Animales , Modelos Animales de Enfermedad , Dopamina/metabolismo , Sistema Nervioso Entérico , Masculino , Oxidopamina/metabolismo , Ratas , Ratas Sprague-Dawley , Tirosina 3-Monooxigenasa/metabolismo
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