Green thermoelectrics: Observation and analysis of plant thermoelectric response

Plants are sensitive to thermal and electrical effects; yet the coupling of both, known as thermoelectricity, and its quantitative measurement in vegetal systems never were reported. We recorded the thermoelectric response of bean sprouts under various thermal conditions and stress. The obtained experimental data unambiguously demonstrate that a temperature difference between the roots and the leaves of a bean sprout induces a thermoelectric voltage between these two points. Basing our analysis of the data on the force-flux formalism of linear response theory, we found that the strength of the vegetal equivalent to the thermoelectric coupling is one order of magnitude larger than that in the best thermoelectric materials. Experimental data also show the importance of the thermal stress variation rate in the plant's electrophysiological response. Therefore, thermoelectric effects are sufficiently important to partake in the complex and intertwined processes of energy and matter transport within plants

Wave chaos in rapidly rotating stars

Effects of rapid stellar rotation on acoustic oscillation modes are poorly understood. We study the dynamics of acoustic rays in rotating polytropic stars and show using quantum chaos concepts that the eigenfrequency spectrum is a superposition of regular frequency patterns and an irregular frequency subset respectively associated with near-integrable and chaotic phase space regions. This opens new perspectives for rapidly rotating star seismology and also provides a new and potentially observable manifestation of wave chaos in a large scale natural system.Comment: 5 pages, 3 figures; accepted for publication in Phys. Rev.

Ventricular fibrillation in experimental hypothermic cardiac surgery, the evaluation of antifibrillary agents

Thesis (M.A.)--Boston Universit

Aplicación de procedimientos contables en el control de inventario.

La compañía se dedica a la compra y venta de helados artesanales,esta ubicada en la cuidad de Guayaquil,la falta de personal capacitado y el desconocimiento de los métodos de valoración a generado que la empresa desconozca el costo real de su inventario,se presenta diferencias entre el stock físico con el contable,lo que ha afectado a los resultados financieros y a la toma de decisiones y al buen desarrollo de la empresa. Esta tesis esta diseñada para aplicar un procedimiento contable para el control de inventario,el mismo ayudara a determinar el costo real del mismo,a disponer del producto necesario para la venta y obtener estados financieros razonables.La metodología de investigación a aplicar es la de campo, por la misma se realizará en el lugar donde se generan las transacciones motivo de esta investigación,servirá de referente para las compañías que desean aplicar todo su contenido en beneficio de su organización,evitando así que la falta de control de inventario que es vital,afecte a los resultados de la compañía. Así se administrará eficientemente todos los recursos que posee la compañía

Influence of Marital Status and Employment Status on Long-Term Adherence with Continuous Positive Airway Pressure in Sleep Apnea Patients

) of consecutive OSAHS patients in whom CPAP had been prescribed for at least 90 days, we studied the impact on long-term treatment adherence of socioeconomic factors, patients and disease characteristics prior to CPAP initiation. living alone; p = 0.01). Age, gender, Epworth sleepiness scale, depressive syndrome, associated cardiovascular morbidities, educational attainment and occupation category did not influence CPAP adherence.Marital status and employment status are independent factors of CPAP adherence in addition to BMI and disease severity. Patients living alone and/or working patients are at greater risk of non-adherence, whereas adherence is higher in married and retired patients. These findings suggest that the social context of daily life should be taken into account in risk screening for CPAP non-adherence. Future interventional studies targeting at-risk patients should be designed to address social motivating factors and work-related barriers to CPAP adherence

Letter to the Editor : Attitudes among Spanish general dentists in relation to burning mouth syndrome: Results of a national survey

Thouret Jacques-Guillaume, Lapoule Jean-Denis-Louis, Talleyrand Périgord Charles Maurice de, Goupil de Préfeln Guillaume François, Populus Marc Etienne, Cochard Claude Alexis, Muguet de Nanthou François Felix, Merlin (de Douai), Toulongeon Emmanuel-François, vicomte de, Tronchet François Denis. Discussion de l'article 4 du titre II du décret sur les droits féodaux, lors de la séance du 27 février 1790. In: Archives Parlementaires de 1787 à 1860 - Première série (1787-1799) Tome XI - Du 24 décembre 1789 au 1er mars 1790. Paris : Librairie Administrative P. Dupont, 1880. pp. 725-727

Comorbidities of COPD

International audienceBy 2020, chronic obstructive pulmonary disease (COPD) will be the third cause of mortality. Extrapulmonary comorbidities influence the prognosis of patients with COPD. Tobacco smoking is a common risk factor for many comorbidities, including coronary heart disease, heart failure and lung cancer. Comorbidities such as pulmonary artery disease and malnutrition are directly caused by COPD, whereas others, such as systemic venous thromboembolism, anxiety, depression, osteoporosis, obesity, metabolic syndrome, diabetes, sleep disturbance and anaemia, have no evident physiopathological relationship with COPD. The common ground between most of these extrapulmonary manifestations is chronic systemic inflammation. All of these diseases potentiate the morbidity of COPD, leading to increased hospitalisations and healthcare costs. They can frequently cause death, independently of respiratory failure. Comorbidities make the management of COPD difficult and need to be evaluated and treated adequately. Extrapulmonary comorbidities are common in COPD and influence prognosis; we propose an exhaustive comorbidities revie

Elaboración de estrategias tributarias que contribuyan a incentivar la inversión y reinversión privada extranjera y Nacional en el ecuador.

"El presente trabajo detalla la Carga Tributaria en el Ecuador, el análisis de tendencias y su incidencia en los Sectores Productivos periodo 2008 – 2012. Se describe la carga tributaria a nivel mundial, regional y local analizando las causas y determinar lo que ha generado su variación, buscando tener una idea clara de los antecedentes y evolución que ha tenido la misma. En referencia a nuestro país sobre la carga tributaria, hacemos una relación entre los niveles de recaudación fiscal que se presentan en el portal electrónico del Servicio de Rentas Internas frente a los niveles del Producto Interno Bruto publicados en la página del Banco Central del Ecuador, para determinar los porcentajes de la presión fiscal, la tendencia que ésta ha mantenido en el período de estudio y de qué manera incide en los sectores productivos. Con este estudio buscamos conocer la situación actual en cuanto a la carga tributaria del país para luego dar una propuesta que ayude a incentivar la inversión y reinversión extranjera y nacional a fin de aumentar la riqueza y el empleo.

The 'absolute existence' of phlogiston: the losing party's point of view.

Long after its alleged demise, phlogiston was still presented, discussed and defended by leading chemists. Even some of the leading proponents of the new chemistry admitted its ‘absolute existence’. We demonstrate that what was defended under the title ‘phlogiston’ was no longer a particular hypothesis about combustion and respiration. Rather, it was a set of ontological and epistemological assumptions and the empirical practices associated with them. Lavoisier’s gravimetric reduction, in the eyes of the phlogistians, annihilated the autonomy of chemistry together with its peculiar concepts of chemical substance and quality, chemical process and chemical affinity. The defence of phlogiston was the defence of a distinctly chemical conception of matter and its appearances, a conception which rejected the chemist’s acquaintance with details and particularities of substances, properties and processes and his skills of adducing causal relations from the interplay between their complexity and uniformity