303 research outputs found
Cyber-Archaeology: Notes on the simulation of the past
[EN] Thirteen years after the book “Virtual Archaeology” (Forte, 1996, 97) it is time to re-discuss the definition, the key concepts and some new trends and
applications. The paper discusses the introduction of the term “cyber-archaeology” in relation with the simulation process deriving from the inter-connected and
multivocal feedback between users/actors and virtual ecosystems. In this new context of cyber worlds, it is more appropriate to talk about simulation of the past
rather than reconstruction of the past. The multivocality of the simulation opens new perspectives in the interpretation process, not imposing the final reconstruction,
but suggesting, evocating, simulating multiple output, not “the past” but a potential past.
New epistemological models of cyber archaeology have to be investigated: what happens in a immersive environment of virtual archaeology where every user is
“embodied” in the cyber space? The ontology of archaeological information, or the cybernetics of archaeology, refers to all the interconnective relationships which the
datum produces, the code of transmission, and its transmittability. Because it depends on interrelationships, by its very nature information cannot be neutral with
respect to how it is processed and perceived. It follows that the process of knowledge and communication have to be unified and represented by a single vector. 3D
information is regarded as the core of the knowledge process, because it creates feedback, then cybernetic difference, among the interactor, the scientist and the
ecosystem. It is argued that Virtual Reality (both offline and online) represents a possible ecosystem, which is able to host top-down and bottom-up processes of
knowledge and communication. In these terms, the past is generated and coded by “a simulation process”. Thus, from the first phases of data acquisition in the
field, the technical methodologies and technologies that we use, influence in a decisive way all the subsequent phases of interpretation and communication. In the light
of these considerations, what is the relationship between information and representation? How much information does a digital model contain? What sorts of and
how many ontologies ought to be chosen to permit an acceptable transmittability? Indeed, our Archaeological communication ought to be understood as a process of
validation of the entire cognitive process of understanding and not as a simple addendum to research, or as a dispensable compendium of data.[ES] Trece años después de la publicación del libro "Arqueología virtual" (Forte, 1996, 97) es el momento de volver a discutir sobre la definición, los conceptos clave y
algunas nuevas tendencias y aplicaciones de la arqueología virtual. El presente documento analiza la introducción del término "cyber-arqueología" en relación con el
proceso de simulación derivado de la interconexión y la retroalimentación multivocal y entre los usuarios / actores y ecosistemas virtuales. En este nuevo contexto de
mundos cibernéticos, es más adecuado hablar de simulación del pasado que de reconstrucción del pasado. La multivocalidad de la simulación abre nuevas
perspectivas en el proceso de interpretación, no imponiendo la última reconstrucción, sino sugiriendo, evocando, simulando múltiples resultados, y no "el pasado",
sino un potencial pasado.
Nuevos modelos epistemológicos de la arqueología cibernética deben ser investigados: Que ocurre en un entorno inmersivo de arqueología virtual cuando cada usuario
es "materializado" en el espacio cibernético? La ontología de la información arqueológica, o la cibernética de la arqueología, se refiere a la interconectividad de todas
las relaciones que produce el dato, el código de envío, y su transmisibilidad. Porque depende de las interrelaciones, por su propia naturaleza, la información no
puede ser neutral con respecto a la forma en que se procesa y percibe. De ello se deduce que el proceso de conocimiento y la comunicación han de ser unificadas y
representadas por un único vector. La información 3D se considera como el núcleo del proceso de conocimiento, porque propicia la retroalimentación, entre el
usuario, el científico y el ecosistema. Se argumenta que la Realidad Virtual (tanto fuera de línea como en línea) representa un posible ecosistema, que es capaz de
ser anfitrión de los procesos de conocimiento y comunicación tanto de arriba a abajo como de abajo a arriba. En estos términos, el pasado se genera y codifica por
"un proceso de simulación". Así, desde las primeras fases de adquisición de datos sobre el terreno, las metodologías técnicas así como las tecnologías que usamos,
influyen de manera decisiva en todas las fases de interpretación y comunicación. A la luz de estas consideraciones, ¿cuál es la relación entre la información y la
representación? ¿Cuánta información quedará incluida en el modelo digital? ¿Qué clase y cuántas ontologías deberían ser elegidas para permitir una
transmisibilidad aceptable? De hecho, la comunicación arqueológica debe ser entendida como una fase de validación de todo el proceso cognitivo de comprensión del
conocimiento, y no como una simple adición a la investigación, o como un compendio de los datos prescindible.The Virtual Museum of the Ancient Via Flaminia was supported
by Arcus spa and managed by CNR-ITABC (scientific direction)
and National Roman Museum in RomeForte, M. (2011). Cyber-Archaeology: Notes on the simulation of the past. Virtual Archaeology Review. 2(4):7-18. https://doi.org/10.4995/var.2011.4543OJS71824ANTINUCCI, A., 2004, Comunicare il museo, Laterza, Roma, 2004.BAUDRILLARD J.. 1994, Simulacra and Simulation, Ann Arbor: University of Michigan Press, 1994.BATESON, 1967, "Cybernetic explanation", in SEM, 410.BATESON, 1972, Steps to an Ecology of Mind , San Francisco, Chandler Press.BATESON G., 1979, Mind and Nature. 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Molecular Implications of natriuretic peptides in the protection from hypertension and target organ damage development
The pathogenesis of hypertension, as a multifactorial trait, is complex. High blood pressure levels, in turn, concur with the development of cardiovascular damage. Abnormalities of several neurohormonal mechanisms controlling blood pressure homeostasis and cardiovascular remodeling can contribute to these pathological conditions. The natriuretic peptide (NP) family (including ANP (atrial natriuretic peptide), BNP (brain natriuretic peptide), and CNP (C-type natriuretic peptide)), the NP receptors (NPRA, NPRB, and NPRC), and the related protease convertases (furin, corin, and PCSK6) constitute the NP system and represent relevant protective mechanisms toward the development of hypertension and associated conditions, such as atherosclerosis, stroke, myocardial infarction, heart failure, and renal injury. Initially, several experimental studies performed in different animal models demonstrated a key role of the NP system in the development of hypertension. Importantly, these studies provided relevant insights for a better comprehension of the pathogenesis of hypertension and related cardiovascular phenotypes in humans. Thus, investigation of the role of NPs in hypertension offers an excellent example in translational medicine. In this review article, we will summarize the most compelling evidence regarding the molecular mechanisms underlying the physiological and pathological impact of NPs on blood pressure regulation and on hypertension development. We will also discuss the protective effect of NPs toward the increased susceptibility to hypertensive target organ damage
The T2238C human atrial natriuretic peptide molecular variant and the risk of cardiovascular diseases
Atrial natriuretic peptide (ANP) is a cardiac hormone which plays important functions to maintain cardio-renal homeostasis. The peptide structure is highly conserved among species. However, a few gene variants are known to fall within the human ANP gene. The variant rs5065 (T2238C) exerts the most substantial effects. The T to C transition at the 2238 position of the gene (13-23% allele frequency in the general population) leads to the production of a 30-, instead of 28-, amino-acid-long α-carboxy-terminal peptide. In vitro, CC2238/αANP increases the levels of reactive oxygen species and causes endothelial damage, vascular smooth muscle cells contraction, and increased platelet aggregation. These effects are achieved through the deregulated activation of type C natriuretic peptide receptor, the consequent inhibition of adenylate cyclase activity, and the activation of Giα proteins. In vivo, endothelial dysfunction and increased platelet aggregation are present in human subjects carrying the C2238/αANP allele variant. Several studies documented an increased risk of stroke and of myocardial infarction in C2238/αANP carriers. Recently, an incomplete response to antiplatelet therapy in ischemic heart disease patients carrying the C2238/αANP variant and undergoing percutaneous coronary revascularization has been reported. In summary, the overall evidence supports the concept that T2238C/ANP is a cardiovascular genetic risk factor that needs to be taken into account in daily clinical practice
Radioactivity in drinking water: regulations, monitoring results and radiation protection issues
INTRODUCTION: Drinking waters usually contain several natural radionuclides: tritium, radon, radium, uranium isotopes, etc. Their concentrations vary widely since they depend on the nature of the aquifer, namely, the prevailing lithology and whether there is air in it or not. AIMS: In this work a broad overview of the radioactivity in drinking water is presented: national and international regulations, for limiting the presence of radioactivity in waters intended for human consumption; results of extensive campaigns for monitoring radioactivity in drinking waters, including mineral bottled waters, carried out throughout the world in recent years; a draft of guidelines for the planning of campaigns to measure radioactivity in drinking water proposed by the Environmental Protection Agency (ARPA) of Lombardia
New Insights into the role of GSK-3 in the regulation of human cardiac electrophysiology
Cardiac arrhythmias still represent a serious health issue, leading to adverse outcomes, such as heart failure and sudden death.
Several drugs used to treat noncardiac diseases, including antibiotics or antipsychotics, can also be responsible for arrhythmia development. Therefore, a major challenge is a deeper comprehension of the molecular mechanisms regulating cardiac electro- physiology, together with the development of predic- tive tools aimed at understanding how a specific condition or drug can favor arrhythmic events
Uncoupling protein 2: a key player and a potential therapeutic target in vascular diseases
Uncoupling protein 2 (UCP2) is an inner mitochondrial membrane protein that belongs to the uncoupling protein family and plays an important role in lowering mitochondrial membrane potential and dissipating metabolic energy with prevention of oxidative stress accumulation. In the present article, we will review the evidence that UCP2, as a consequence of its roles within the mitochondria, represents a critical player in the predisposition to vascular disease development in both animal models and in humans, particularly in relation to obesity, diabetes, and hypertension. The deletion of the UCP2 gene contributes to atherosclerosis lesion development in the knockout mice, also showing significantly shorter lifespan. The UCP2 gene downregulation is a key determinant of higher predisposition to renal and cerebrovascular damage in an animal model of spontaneous hypertension and stroke. In contrast, UCP2 overexpression improves both hyperglycemia- and high-salt diet-induced endothelial dysfunction and ameliorates hypertensive target organ damage in SHRSP. Moreover, drugs (fenofibrate and sitagliptin) and several vegetable compounds (extracts from Brassicaceae, berberine, curcumin, and capsaicin) are able to induce UCP2 expression level and to exert beneficial effects on the occurrence of vascular damage. As a consequence, UCP2 becomes an interesting therapeutic target for the treatment of common human vascular diseases
Estrogenic and anti-androgenic endocrine disrupting chemicals and their impact on the male reproductive system
Endocrine disrupting chemicals (EDCs) are identified for their ability to perturb the homeostasis of endocrine system and hormonal balance. The male reproductive system is under close control of hormones and each change in their concentration and time of exposition and action can induce a deregulation of its physiology. In this review we summarize the most recent studies on two main categories of EDCs with different action: the estrogenic bisphenol A and alkylphenols and the anti-androgenic phthalates. This review describes the main effects of these substances on male reproductive system
VR WebGIS: an OpenSource approach to 3D real-time landscape management
OpenSource philosophy has reached to
unexpected goals. The diffusion of
OpenSource tools is increased quite a
lot, but also the quality of the tools is improving.
Their usability is slowing going
even towards communities not exactly
skilled in advanced programming. Open
movement is penetrated in many sectors,
often subverting, thank to its social impact,
the traditional rules of companies
and research institutions, pulling down
sometimes hierarchies and pushing on
innovative ideas because of their validity
and values. [...]Peer Reviewe
Nitric oxide, cytochrome c oxidase and myoglobin: Competition and reaction pathways
AbstractIt is relevant to cell physiology that nitric oxide (NO) reacts with both cytochrome oxidase (CcOX) and oxygenated myoglobin (MbO2). In this respect, it has been proposed [Pearce, L.L., et al. (2002) J. Biol. Chem. 277, 13556–13562] that (i) CcOX in turnover out-competes MbO2 for NO, and (ii) NO bound to reduced CcOX is “metabolized” in the active site to nitrite by reacting with O2. In contrast, rapid kinetics experiments reported in this study show that (i) upon mixing NO with MbO2 and CcOX in turnover, MbO2 out-competes the oxidase for NO and (ii) after mixing nitrosylated CcOX with O2 in the presence of MbO2, NO (and not nitrite) dissociates from the enzyme causing myoglobin oxidation
VR WebGIS: an OpenSource approach to 3D real-time landscape management
OpenSource philosophy has reached to
unexpected goals. The diffusion of
OpenSource tools is increased quite a
lot, but also the quality of the tools is improving.
Their usability is slowing going
even towards communities not exactly
skilled in advanced programming. Open
movement is penetrated in many sectors,
often subverting, thank to its social impact,
the traditional rules of companies
and research institutions, pulling down
sometimes hierarchies and pushing on
innovative ideas because of their validity
and values. [...]Peer Reviewe
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