3,129 research outputs found
Estimating the mass of CMEs from the analysis of EUV dimmings
Context. Reliable estimates of the mass of coronal mass ejections (CMEs) are required to quantify their energy and predict how they affect space weather. When a CME propagates near the observer's line of sight, these tasks involve considerable errors, which motivated us to develop alternative means for estimating the CME mass. Aims. We aim at further developing and testing a method that allows estimating the mass of CMEs that propagate approximately along the observer's line of sight. Methods. We analyzed the temporal evolution of the mass of 32 white-light CMEs propagating across heliocentric heights of 2.5-15 R, in combination with that of the mass evacuated from the associated low coronal dimming regions. The mass of the white-light CMEs was determined through existing methods, while the mass evacuated by each CME in the low corona was estimated using a recently developed technique that analyzes the dimming in extreme-UV (EUV) images. The combined white-light and EUV analyses allow the quantification of an empirical function that describes the evolution of CME mass with height. Results. The analysis of 32 events yielded reliable estimates of the masses of front-side CMEs. We quantified the success of the method by calculating the relative error with respect to the mass of CMEs determined from white-light STEREO data, where the CMEs propagate close to the plane of sky. The median for the relative error in absolute values is ≈30%; 75% of the events in our sample have an absolute relative error smaller than 51%. The sources of uncertainty include the lack of knowledge of piled-up material, subsequent additional mass supply from the dimming region, and limitations in the mass-loss estimation from EUV data. The proposed method does not rely on assumptions of CME size or distance to the observer's plane of sky and is solely based on the determination of the mass that is evacuated in the low corona. It therefore represents a valuable tool for estimating the mass of Earth-directed events.Fil: López, F. M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Cremades Fernandez, Maria Hebe. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Tecnológica Nacional; ArgentinaFil: Balmaceda, Laura Antonia. George Mason University; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Nuevo, Federico Alberto. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Vásquez, A. M.. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Universidad Nacional de Tres de Febrero; Argentin
Add-on Effect of Postural Instructions to Abdominopelvic Exercise on Urinary Symptoms and Quality of Life in Climacteric Women with Stress Urinary Incontinence : A Pilot Randomized Controlled Trial
The aim of this study was to investigate the add-on effect of postural instructions to an abdominopelvic exercise program on incontinence urinary symptoms (UI symptoms) and quality of life (QoL) in climacteric women with stress urinary incontinence (SUI). A randomized controlled trial was performed with a total of 40 climacteric women with SUI aged between 46 and 75 years old. Participants were randomly assigned to two groups: a group performing an abdominopelvic exercise program (AEP) (n = 20) and a group performing abdominopelvic exercise with the addition of postural instructions (AEPPI) (n = 20). Primary outcome measures were UI symptoms, UI impact and QoL related to UI (UI-QoL), measured by 48 h Pad Test and International Consultation on Incontinence Questionnaire Short Form (ICIQ-UI-SF), which were assessed at baseline, post-intervention and 3 months follow-up. Secondary outcome was patient's satisfaction measured by the 100-point Visual Analogic Scale (VAS) only after the intervention. Between-groups differences were observed in terms of UI-QoL immediately after intervention. Within-groups differences were observed between baseline to 3 months follow-up and between post-intervention to 3 months follow-up in AEPPI group (p < 0.05) for UI-QoL and UI impact. UI symptoms were improved in both groups between baseline to 3-months follow-up (p < 0.05). Patient's satisfaction was higher in the AEPPI group (p < 0.05). The addition of postural instructions to an abdominopelvic exercise programimproves UI impact to QoL and patients' satisfaction in women with SUI
Q Methodology: A Method for Understanding Complex Viewpoints in Communities Served by Extension
This article introduces Q methodology, an idea-sorting activity that can help Extension improve outreach and education on new and contentious issues. Q methodology is a helpful tool when Extension professionals are confronted with controversial or complex resource management challenges. Through the analysis of a simple card-sorting exercise, researchers can determine quantitatively and qualitatively how different issues combine to result in (a) an individual\u27s viewpoint on an issue and (b) groupings of different viewpoints within a community. We describe the basic approach to implementing Q methodology and suggest circumstances in which it can help facilitate Extension outreach and education
Importancia del equilibrio del índice omega-6/omega-3 en el mantenimiento de un buen estado de salud: recomendaciones nutricionales
The modification of dietary patterns has led to a
change in fatty acid consumption, with an increase in the
consumption of -6 fatty acids and a markerd reduction
in the consumption of -3 fatty acids. This in turn has
given rise to an imbalance in the -6/ -3 ratio, which is
now very different from the original 1:1 ratio of
humans in the past.
Given the involvement of -6 and -3 essential fatty
acids in disease processes, the present article examines
changes in dietary patterns that have led to the present
reduction in the consumption of -3 essential fatty
acids, and to study the importance of the -6/ -3 balance
in maintaining good health. In addition, an assesement
is made of the established recommendations for
preventing a poor intake of -3 essential fatty acids,
and the possible options for compensating the lack of
these fatty acids in the dietLa modificación de los hábitos alimentarios ha llevado
a un cambio en el consumo de ácidos grasos, con una
aumento de los ácidos grasos -6 y una marcada reducción
en el consumo de los ácidos grasos -3. Esto a su vez
ha dado lugar a un desequilibrio en la relación -6/ -3,
muy diferente de la proporción original 1:1 que tenían los
seres humanos en el pasado.
Dada la importancia de la relación entre los ácidos grasos
esenciales -6 y -3 en el desarrollo de diferentes enfermedades,
en el presente artículo se examinan los cambios en los
hábitos alimentarios que han llevado a la reducción en el
consumo de ácidos grasos esenciales -3, y se estudia la
importancia de este equilibrio en el mantenimiento de la
salud. Además, se realiza una evaluación de las recomendaciones
establecidas para prevenir una deficiencia en la
ingesta de ácidos grasos esenciales -3, y las posibles opciones
para compensar la falta de esos ácidos grasos en la diet
The Impact of Bias on the Scholar-Practitioner's Doctoral Journey
This essay discusses the utilization of safeguard strategies, particularly Improvement Science principles, in the academic and professional writing of scholar-practitioners within EdD programs. These strategies bridge the gap between theory and practice, enabling graduate students to apply their scholarly insights meaningfully. The essay highlights the roles of bias, professional wisdom, positionality, and reflexivity in inquiry, empowering scholar-practitioners to develop authentic solutions to the problems of practice they encounter. Drawing on the recommendations of Perry and colleagues (2020), the essay emphasizes rigorous data collection, explicit theoretical frameworks, evidence of impact on practice, and transparent mitigation of biases. Strategies such as positionality and reflexivity statements, adoption of Improvement Science as a conceptual framework, critical questions as safeguards, and engagement with critical friend groups (CFG) enhance the integrity and rigor of scholar-practitioners' inquiries. By implementing these measures, scholar-practitioners foster a robust examination of problems of practice and contribute to the advancement of knowledge
An hypothesis on crustacean pigmentation metabolism:L-carnitine and nuclear hormone receptors as limiting factors
Astaxanthin (Axn) is the primary pigment molecule in crustaceans associated with quality, health and growth traits, leading to increased marketing value. Axn can be contained within the protein complex crustacyanin (CRCN) to produce an array of different shell colours, or esterified with fatty acids (FA) for storage but also contributing additional red colouration. l-Carnitine (LC) has a major role in FA oxidation and mitochondrial function optimization, which could influence the proportion of Axn complexed with FA or CRCN. Peroxisome proliferator activated receptors (PPARs) have important roles in FA and Axn uptake, and stored lipid oxidation affecting Axn homeostasis and storage in lipid bodies. Whether Axn could increase PPAR signalling and carnitine palmitoyl transferase activity, leading to induction of lipid metabolism, is not known in crustaceans. Several FA have been shown to preferentially form FA Axn-esters, including saturated fatty acids (SFA) such as C16:0 and C18:0, mono-unsaturated fatty acids (MUFA) such as C16:1 and C18:1, and poly-unsaturated fatty acids (PUFA) such as C20:4, C20:5, and C20:6. We hypothesize that manipulating the dietary ratios and inclusion of LC, Axn, and specific FA may be able to further improve pigment utilization, lipid metabolism, health, and growth in crustaceans.</p
Hormonal an inflammatory biomarkers in a group of overweight and obese women
Introducción y Objetivos: Recientemente se ha descubierto
que la obesidad es una patología caracterizada por
un estado crónico de inflamación leve. El objetivo de este
estudio fue describir la situación hormonal e inflamatoria
de un colectivo de mujeres con sobrepeso/obesidad.
Pacientes y métodos: se incluyeron mujeres > 18 años, con
IMC ≥ 25 < 40 kg/m2. Se recogieron datos socio-sanitarios,
presión arterial, parámetros antropométricos, de actividad
física, estudio bioquímico, hormonal e inflamatorio para
determinar la situación hormonal e inflamatoria de un
colectivo de mujeres antes del inicio de un tratamiento para
el control de peso corporal.
Resultados: participaron 104 mujeres con edad media de
48,4 ± 9 años y un IMC de 29,8 ± 3,5 kg/m2. Un 48% de las
mujeres estudiadas se encontraba en etapa de menopausia.
Un 8,9% presentó hiperinsulinemia. El valor medio obtenido
de grhelina fue 38,8 ± 33,6 pg/ml, no se encontró correlación
entre sus concentraciones y las variables antropométricas y
bioquímicas estudiadas. Los valores medios de PCR, leptina,
adiponectina, resistina, IL 6, IL 10 y PAI 1 fueron 3,0 ± 2,7
mg/dl, 36,3 ± 19,5 ng/ml, 8,3 ± 4,5 μg/ml, 24,3 ± 23,2 ng/ml, 51,6
± 93,6 pg/ml, 10,0 ± 34,2 pg/ml y 22,3 ± 30,6 ng/ml, respectivamente.
Estas concentraciones correlacionaron significativamente
con diferentes variables antropométricas y bioquímicas,
sin embargo, estas correlaciones fueron débiles. Variables
como la edad y presencia o no de menopausia o la práctica de
actividad física de forma regular no influyeron en los valores
medios obtenidos. Las pacientes con obesidad tuvieron valores
medios significativamente más elevados que aquellas con
sobrepeso, aunque sólo en el caso de la resistina y PAI 1.
Conclusión: El grupo de mujeres estudiadas presentó
cifras de adipoquinas alteradas en relación a otros estudios
realizados en población con situación nutricional normal.
Esto pone en evidencia la situación inflamatoria presente en
estos pacientes y los valores obtenidos pueden contribuir a
establecer unos rangos normalizados de estos marcadores
para el colectivo de personas con sobrepeso y obesidadBackground and objectives: The aim of this study was
to describe the hormonal and inflammatory status of a
group of overweight/obese women.
Patients and methods: The sample studied was a crosssectional
cohort of women > 18 years of age, BMI ≥ 25 <
40 kg/m2, prior to starting a weight control program. Data
collected were: demographic characteristics, blood pressure,
anthropometric parameters, physical activity data,
and biochemical, hormonal and inflammatory biomarkers.
Results: The study involved 104 women with a mean
age of 48.4 ± 9 years and a BMI of 29.8 ± 3.5 kg/m2. Some
48% of the women studied were in menopause. Some
8.9% had hyperinsulinemia. The mean ghrelin value was
38.8 ± 33.6 pg/ml; there was no correlation between ghrelin
levels and anthropometric and biochemical variables.
CRP, leptin, adiponectin, resistin, IL6, IL10, and PAI1
were 3.0 ± 2.7 mg/dl, 36.3 ± 19.5 ng/ml, 8.3 ± 4.5 mg/ml,
24.3 ± 23.2 ng/ml, 51.6 ± 93.6 pg/ml, 10.0 ± 34.2 pg/ml and
22.3 ± 30.6 ng/ml, respectively. Obese patients had significantly
higher mean values of resistin and PAI 1 than those
who were overweight. These levels correlated significantly
with anthropometric and biochemical variables;
however, the correlations were weak. Age, menopause or
the regular practice of physical activity had no effect on
mean values.
Conclusions: The group of women studied had altered
inflammatory biomarkers in relation to people of normal
weight. The study shows the inflammatory status of overweight/
obese individuals, and the values obtained may
help to establish standard ranges for these markersEste trabajo ha sido posible gracias a un proyecto de
investigación obtenido por concurso y subvencionado
por la campaña “Pan cada día” promovida por el
Comité Científico del Pan y el Incerhpan (Interprofesional
Agroalimentaria de la cadena Cereales-Harina-
Pan
Xenobiotics that affect oxidative phosphorylation alter differentiation of human adipose-derived stem cells at concentrations that are found in human blood
Adipogenesis is accompanied by differentiation of adipose tissuederived stem cells to adipocytes. As part of this differentiation, biogenesis of the oxidative phosphorylation system occurs. Many chemical compounds used in medicine, agriculture or other human activities affect oxidative phosphorylation function. Therefore, these xenobiotics could alter adipogenesis. We have analyzed the effects on adipocyte differentiation of some xenobiotics that act on the oxidative phosphorylation system. The tested concentrations have been previously reported in human blood. Our results show that pharmaceutical drugs that decrease mitochondrial DNA replication, such as nucleoside reverse transcriptase inhibitors, or inhibitors of mitochondrial protein synthesis, such as ribosomal antibiotics, diminish adipocyte differentiation and leptin secretion. By contrast, the environmental chemical pollutant tributyltin chloride, which inhibits the ATP synthase of the oxidative phosphorylation system, can promote adipocyte differentiation and leptin secretion, leading to obesity and metabolic syndrome as postulated by the obesogen hypothesis
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