121,051 research outputs found

    Desarrollo de papeles biocativos por injerto de mol茅culas espec铆ficas en celulosa

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    Tesis (DCI)--FCEFN-UNC, 2019En la presente tesis se presenta el desarrollo de papeles bioactivos con potencial aplicaci贸n en el envasado activo de alimentos. Para tal fin, se propuso el injerto de eugenol, un compuesto de origen natural con propiedades antimicrobiana, antioxidante y repelente de insectos, en celulosa, utilizando 谩cido policarbox铆lico como agente ligante. Con el objetivo de evaluar la escalabilidad del proceso propuesto, se estudiaron distintas tecnolog铆as de curado, tales como calentamiento por convecci贸n, infrarrojo, microondas y conducci贸n. En todos los casos, se analizaron la influencia de las variables operativas sobre el avance de la reacci贸n y propiedades finales del papel preparado, utilizando un dise帽o de experimentos Doehlert para elegir las experiencias a realizar, y analizando los resultados mediante metodolog铆a de superficie de respuesta y an谩lisis estad铆stico ANOVA. Se pudo comprobar que la reacci贸n de injerto de eugenol en papel comercial se produjo con 茅xito en todas las tecnolog铆as estudiadas. Asimismo, se encontraron las condiciones 贸ptimas de reacci贸n para cada una de las tecnolog铆as, para lo cual se busc贸 un compromiso entre el avance de la reacci贸n y las propiedades finales del material (mec谩nicas y color). A partir de estas condiciones, se prepararon papeles y se realiz贸 una caracterizaci贸n m谩s espec铆fica para su aplicaci贸n como envase de alimentos comparando los papeles modificados con el papel virgen. Se analizaron las propiedades mec谩nicas por ensayo de tracci贸n, rasgado y punzonado y se midi贸 la absorci贸n de agua y la capacidad de degradaci贸n. Por otro lado, las propiedades bioactivas analizadas fueron la actividad antioxidante, antimicrobiana, repelente e insecticida de gorgojos (T. castaneum y R. dominica). Una vez probado que el papel modificado presenta buenas caracter铆sticas f铆sicas y bioactivas para su posible aplicaci贸n en el envasado de alimentos, se realizaron prototipos de envasado para harina, como alimento representativo de alimentos derivados de cereales, susceptibles al ataque de plagas. En este estudio se analiz贸 la migraci贸n de reactivos, propiedades organol茅pticas y conservaci贸n del alimento, arrojando resultados promisorios para la industria de envases de alimentos. Finalmente, se realiz贸 una comparaci贸n de las tecnolog铆as de curado ensayadas, analizando diferentes aspectos como avance de reacci贸n, propiedades finales, apariencia, tiempo de reacci贸n, consumo de energ铆a, entre otros, como as铆 tambi茅n disponibilidad y uso de estas tecnolog铆as a escala industrial, seleccionando la tecnolog铆a de conducci贸n como la m谩s adecuada para una propuesta de escalado industrial.Fil: Muratore, Florencia. Universidad Nacional de C贸rdoba. Facultad de Ciencias Exactas, F铆sicas y Naturales; Argentina.Fil: Muratore, Florencia. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Instituto de Investigaci贸n y Desarrollo en Ingenier铆a de Procesos y Qu铆mica Aplicada; Argentina

    Crime and Prejudice: Ming Criminal Justice as Seen in 16th Century Spanish Sources

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    鑳″畨鈥㈠唸钀ㄩ浄鏂㈠痉鈥㈤棬澶氳惃浜1585骞村嚭鐗堢殑 銆婁腑鍗庡ぇ甯濆浗鍙层嬬涓娆′互瑗跨彮鐗欒鍜岃憽钀 鐗欒鍏ㄩ潰鏁寸悊浜嗘湁鍏充腑鍥界殑璁拌堪銆傝涔︽闈 璁板綍浜嗕腑鍥芥槑鏈濆徃娉曞埗搴︼紝骞舵帰璁ㄤ簡杩欎簺鍙 娉曞埗搴︿笌褰撲唬瑗跨彮鐗欏拰澧ㄨタ鍝ュ徃娉曞埗搴︿箣闂 鐨勫法澶у樊鍒傚叾涓寘鎷娉曞緥鍜屽叕鍏辨鏋剁殑 鏇茶В锛屽叕浼楀璇佷汉鐨勮川鐤戯紝澶氬眰闈笉鍚屽舰寮 鐨勬儵缃氾紝缁忔祹涓婄殑鎯╃綒浠ュ強姝诲垜鐨勫満鏅備綔 鑰呭湪涔︿腑寮鸿皟閫氳繃濂栧姳鍜屾儵缃氬弻閲嶆柟寮忓鍚 绾у畼鍛樸佷笅灞炲ぇ鑷h繘琛屼弗鏍兼帶鍒讹紝浠ヤ繚璇佸 鍚勭骇瀹樺憳鐨勯夋嫈浠荤敤鏍囧噯锛岃繖涓鐐逛篃鏇惧湪钂 鐢板鏄庝唬瀹樺憳鐨勮瘎浠蜂腑寰楀埌杩囦綋鐜般傛澶栵紝 鑳″畨鈥㈠唸钀ㄩ浄鏂㈠痉鈥㈤棬澶氳惃杩樺崄鍒嗗磭鏁畧鎶ゅ嵃 绗畨浜虹殑鎷夋柉鍗¤惃鏂紝浠栧喅瀹氫粠浠栫殑鏂囩尞涓 鍒犳帀閭d簺涓哄鎶椾腑鍥借屽悜寮虹‖娲炬彁渚涚殑鎵璋 姝e綋鏉冨埄鐨勮杈╋紝濡傛礇闃垮皵鍗℃墍鐩澒鐨勯偑鎭 鍜屾潨鎷夊焹灏间簹鎵鎻忚堪鐨勬鍒戠瓑銆 Gonz谩lez de Mendoza鈥檚 book on China, published in 1585, compiled all the first narratives about China, both Portuguese and Spanish. It contains a highly positive account of Ming criminal justice in which he emphasizes those elements of Chinese justice that deeply contrasts with Spanish and Mexican practices: the legal and public frame of torture, the public questioning of witnesses, the multilayered revisions of penalties, the public placing of the monetary fines, and the mise en sc猫ne of the death penalty. He insistently highlights the strict control upon every layer of officers and inferior ministers through a double procedure of rewards and punishments that guarantees the high standing of Chinese officials, an appraisal that Montaigne would pick up in his extremely rare allusions to China. At the same time, Gonz谩lez de Mendoza, a thorough admirer of father Las Casas, the defender of Indians, decided to omit from his sources those elements that could provide the hardliners with arguments, the just title, to confront China, such as the nefandous sin witnessed by Loarca and the death by a thousand cuts described by Due帽as

    Efecto a medio plazo de la recurrencia de los incendios forestales en la regeneraci贸n post-fuego del pinar de Tabuyo del Monte

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    En el presente trabajo se pretende comparar la regeneraci贸n de la comunidad vegetal dominada por P. pinaster en Tabuyo del Monte (sierra delTeleno) en dos escenarios de recurrencia de incendios diferentes:una zona afectada por un solo incendio en los 煤ltimos cuarenta a帽os (recurrencia 1, incendio de 2012) y una zona afectada por dos incendios en los 煤ltimos cuarenta a帽os (recurrencia 2, incendio de 1998 y posteriormente incendio de 2012). Para ello se tomaron datos de porcentaje de suelo descubierto, cobertura vegetal por especies, por biotipos y por estrategia de regeneraci贸n (rebrotadoras y germinadoras), as铆 como distintas variables poblacionales de Pinus pinaster

    Identification of Hindbrain Neural Substrates for Motor Initiation in the hatchling Xenopus laevis Tadpole

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    Animal survival profoundly depends on the ability to detect stimuli in the environment, process them and respond accordingly. In this respect, motor responses to a sensory stimulation evolved into a variety of coordinated movements, which involve the control of brain centres over spinal locomotor circuits. The hatchling Xenopus tadpole, even in its embryonic stage, is able to detect external sensory information and to swim away if the stimulus is considered noxious. To do so, the tadpole relies on well-known ascending sensory pathway, which carries the sensory information to the brain. When the stimulus is strong enough, descending interneurons are activated, leading to the excitation of spinal CPG neurons, which causes the undulatory movement of swimming. However, the activation of descending interneurons that marks the initiation of motor response appears after a long delay from the sensory stimulation. Furthermore, the long-latency response is variable in time, as observed in the slow-summating excitation measured in descending interneurons. These two features, i.e. long-latency and variability, cannot be explained by the firing time and pattern of the ascending sensory pathway of the Xenopus tadpole. Therefore, a novel neuronal population has been proposed to lie in the hindbrain of the tadpole, and being able to 'hold' the sensory information, thus accounting for the long and variable delay of swim initiation. In this work, the role of the hindbrain in the maintenance of the long and variable response to trunk skin stimulation is investigated in the Xenopustadpole at developmental stage 37/38. A multifaceted approach has been used to unravel the neuronal mechanisms underlying the delayed motor response, including behavioural experiments, electrophysiology analysis of fictive swimming, hindbrain extracellular recordings and imaging experiments. Two novel neuronal populations have been identified in the tadpole's hindbrain, which exhibit activation patterns compatible with the role of delaying the excitation of the spinal locomotor circuit. Future work on cellular properties and synaptic connections of these newly discovered populations might shed light on the mechanism of descending control active at embryonic stage. Identifying supraspinal neuronal populations in an embryonic organism could aid in understanding mechanisms of descending motor control in more complex vertebrates

    Interactive Sonic Environments: Sonic artwork via gameplay experience

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    The purpose of this study is to investigate the use of video-game technology in the design and implementation of interactive sonic centric artworks, the purpose of which is to create and contribute to the discourse and understanding of its effectiveness in electro-acoustic composition highlighting the creative process. Key research questions include: How can the language of electro-acoustic music be placed in a new framework derived from videogame aesthetics and technology? What new creative processes need to be considered when using this medium? Moreover, what aspects of 'play' should be considered when designing the systems? The findings of this study assert that composers and sonic art practitioners need little or no coding knowledge to create exciting applications and the myriad of options available to the composer when using video-game technology is limited only by imagination. Through a cyclic process of planning, building, testing and playing these applications the project revealed advantages and unique sonic opportunities in comparison to other sonic art installations. A portfolio of selected original compositions, both fixed and open are presented by the author to complement this study. The commentary serves to place the work in context with other practitioners in the field and to provide compositional approaches that have been taken

    Balancing the urban stomach: public health, food selling and consumption in London, c. 1558-1640

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    Until recently, public health histories have been predominantly shaped by medical and scientific perspectives, to the neglect of their wider social, economic and political contexts. These medically-minded studies have tended to present broad, sweeping narratives of health policy's explicit successes or failures, often focusing on extraordinary periods of epidemic disease viewed from a national context. This approach is problematic, particularly in studies of public health practice prior to 1800. Before the rise of modern scientific medicine, public health policies were more often influenced by shared social, cultural, economic and religious values which favoured maintaining hierarchy, stability and concern for 'the common good'. These values have frequently been overlooked by modern researchers. This has yielded pessimistic assessments of contemporary sanitation, implying that local authorities did not care about or prioritise the health of populations. Overly medicalised perspectives have further restricted historians' investigation and use of source material, their interpretation of multifaceted and sometimes contested cultural practices such as fasting, and their examination of habitual - and not just extraordinary - health actions. These perspectives have encouraged a focus on reactive - rather than preventative - measures. This thesis contributes to a growing body of research that expands our restrictive understandings of pre-modern public health. It focuses on how public health practices were regulated, monitored and expanded in later Tudor and early Stuart London, with a particular focus on consumption and food-selling. Acknowledging the fundamental public health value of maintaining urban foodways, it investigates how contemporaries sought to manage consumption, food production waste, and vending practices in the early modern City's wards and parishes. It delineates the practical and political distinctions between food and medicine, broadly investigates the activities, reputations of and correlations between London's guild and itinerant food vendors and licensed and irregular medical practitioners, traces the directions in which different kinds of public health policy filtered up or down, and explores how policies were enacted at a national and local level. Finally, it compares and contrasts habitual and extraordinary public health regulations, with a particular focus on how perceptions of and actual food shortages, paired with the omnipresent threat of disease, impacted broader aspects of civic life

    South Yorkshire low carbon energy supply chains: insulation sector summary

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    South Yorkshire low carbon energy supply chains: hydrogen sector summary

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    The JCMT BISTRO Survey: Multi-wavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+

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    Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties and grain alignment efficiency, as well as their variations in the line of sight, making it difficult to interpret polarization unambiguously. The comparison of polarimetry at multiple wavelengths is a possible way of mitigating this problem. We use data from HAWC+/SOFIA and from SCUBA-2/POL-2 (from the BISTRO survey) to analyse the NGC 2071 molecular cloud at 154, 214 and 850 渭m. The polarization angle changes significantly with wavelength over part of NGC 2071, suggesting a change in magnetic field morphology on the line of sight as each wavelength best traces different dust populations. Other possible explanations are the existence of more than one polarization mechanism in the cloud or scattering from very large grains. The observed change of polarization fraction with wavelength, and the 214-to-154 渭m polarization ratio in particular, are difficult to reproduce with current dust models under the assumption of uniform alignment efficiency. We also show that the standard procedure of using monochromatic intensity as a proxy for column density may produce spurious results at HAWC+ wavelengths. Using both long-wavelength (POL-2, 850 渭m) and short-wavelength (HAWC+, 鈮200渭m) polarimetry is key in obtaining these results. This study clearly shows the importance of multi-wavelength polarimetry at submillimeter bands to understand the dust properties of molecular clouds and the relationship between magnetic field and star formation

    Making School Streets Healthier: Learning from temporary and emergency closures

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    The Healthy Streets Everyday (HSE) programme began in 2019 to promote active, safe, and sustainable travel in London. In line with the Mayor鈥檚 Transport Strategy, this programme emphasises the Healthy Streets approach, which recognises that promoting health on London鈥檚 streets requires supporting the diverse ways streets are used, including active travel, by making them safer and more accessible to all. School Streets 鈥 the temporary closure of streets in front of schools to motor vehicle traffic at the beginning and end of the school day 鈥 have recently emerged as a key intervention in this approach. The connection between streets and broader public health is perhaps nowhere starker than at the school gates. With over 20% of peak- time traffic associated with the school run, traffic and congestion are concentrated at the cramped residential streets that often serve London鈥檚 schools. This puts children at greater risk from road danger and poor air quality. These challenging conditions have been exacerbated by Covid-19; specifically, the need for physical distancing and concern about the effects of a car-based recovery. In response, there has been significant growth in School Streets since the beginning of 2020, with more than 400 currently in place across London. The HSE programme played an important part in providing support to 16 of London鈥檚 boroughs as they implemented their School Streets programmes, often for the first time. As a crucial part of Transport for London鈥檚 Covid-19 Streetspace scheme many of these recent School Streets have been implemented as temporary or emergency interventions, employing light-touch and low-cost approaches such as mobile traffic camera enforcement or temporary barriers. This report sets out several key findings from the close observation of two School Streets: 1. Significant reductions in motor vehicle traffic both during the closure time and over the whole day. 2. Minimal change in pedestrian numbers and use of space, with some evidence of increased cycling. 3. Improvements in several Healthy Streets indicators. Following from these findings and considering more comprehensive academic research, this report also outlines four recommendations for designers and policymakers to consider when making School Streets more permanent or implementing new schemes: 1.Taking a whole school and whole route approach 2.Reducing traffic effectively through enforcement and exemptions 3.Completing a scheme by changing the public realm 4.Designing for and responding to scheme issues through in-depth monitoring and evaluatio
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