Mecanismos de evasión del sistema del complemento utilizados por Trypanosomacruzi

Trypanosomacruzi es el agente causal de la enfermedad de Chagas, la infección parasitaria más importante deLatinoamérica. Se considera una enfermedad crónica, que causa discapacidad, para la cual no existe tratamientoefectivo. Para poder establecer una infección de manera exitosa, T. cruzi cuenta con múltiples mecanismos para evadirla respuesta inmune del hospedero. Entre estos múltiples mecanismos, los tripomastigotes, formas infectantes delparásito, cuentan con mecanismos que los hacen resistir el ataque del sistema del complemento. Por el contrario, losepimastigotes son altamente susceptibles. Para resistir la lisis mediada por el complemento, T. cruziutilizadiversosfactores que interfieren con las funciones de la ruta clásica o alterna en distintos puntos de la cascada. Sin embargo,estos mecanismos no son del todo comprendidos. Entre las proteínas que participan en la resistencia a la lisis están elfactor acelerador del decaimiento de las convertasas de T. cruzi(T-DAF), la proteína reguladora del complemento de T.cruzi (CRP), calreticulina de T. cruzi(TcCRT), factor H, entre otras. A continuación revisaremos el rol de estasproteínas en la evasión del sistema del complemento del hospedero por T. cruzi.  

Small solid renal masses: Characterization by diffusion-weighted MRI at 3 T

AIM: To describe the appearance of small solid renal lesions ( 643 cm) on diffusion-weighted magnetic resonance imaging (MRI) and to determine whether ADC measurements may help to differentiate benign from malignant small solid renal masses. METHODS AND MATERIALS: Thirty-five patients with 47 small renal masses (23 malignant, 24 benign) who underwent 3 T MRI of the kidney using diffusion-weighted sequences (b values of 0 and 1000 s/mm(2)) were retrospectively evaluated. Qualitative and quantitative analysis of diffusion-weighted images was performed. RESULTS: Most lesions were hyperintense to kidney on high b-value diffusion-weighted images and hypointense on apparent diffusion coefficient (ADC) map. The mean ADC of the lesions was significantly lower than that of kidney (1.22 \ub1 0.3 versus 1.85 \ub1 0.12 mm(2)/s; p < 0.005). The mean ADC was significantly different between renal cell carcinomas (1.2 \ub1 0.01 mm(2)/s), metastases (1.25 \ub1 0.04 mm(2)/s), angiomyolipoma (1.07 \ub1 0.3 mm(2)/s) and oncocytomas (1.56 \ub1 0.08 mm(2)/s; p < 0.05). The mean ADC of clear cell renal cell carcinomas was significantly different from that of non-clear cell renal cell carcinomas (1.38 \ub1 0.34 versus 0.83 \ub1 0.34 mm(2)/s; p < 0.005). No significant difference was found between mean ADC of fat containing and minimal fat angiomyolipomas (1.06 \ub1 0.48 versus 1.11 \ub1 0.33 mm(2)/s). CONCLUSION: Small solid renal masses are hyperintense on high b value and have different ADC values

Urban green grabbing : Residential real estate developers discourse and practice in gentrifying Global North neighborhoods

Altres ajuts: Acord transformatiu CRUE-CSICUnidad de excelencia María de Maeztu CEX2019-000940-MIn the movement towards building greener and more sustainable cities, real estate developers are increasingly embracing not only green building construction but broader strategies and action related to urban greening. To date, their motivations and role in this broader urban greening dynamic remains underexplored, yet essential to dissect how greening is sustained and real estate development legitimized in revitalizing neighborhoods. With an eye to better understand green urban capitalist development processes underway amidst financialized nature and urban growth, and the equity impacts they entail, we explore residential real estate developers urban greening discourses and practices. Through a novel dataset of 42 interviews with private and non-profit residential real estate developers in 15 mid-sized American, Western European and Canadian cities, we uncover three differentiated but interconnected discourses around (i) financial benefits, (ii) consumer- or investor-driven demand and (iii) social dimensions behind developers' interest in urban greening. We argue that developers embark on urban green grabbing through "green" discursive and material value appropriation and rent extraction strategies. Urban green grabbing is conceptually useful in depicting who benefits and how/when developers extract additional rent, surplus value, social capital and/or prestige from locating new residential projects adjacent to new or up-and-coming green amenities. Our work contributes to debates about urban greening's perceived position as a value-producing and rent-extracting good from both a political economy and political ecology perspectiv

Role of computed tomography and magnetic resonance imaging in local complications of acute pancreatitis

Acute pancreatitis (AP) represents a pancreas inflammation of sudden onset that can present different degrees of severity. AP is a frequent cause of acute abdomen and its complications are still a cause of death. Biliary calculosis and alcohol abuse are the most frequent cause of AP. Computed tomography (CT) and magnetic resonance imaging (MRI) are not necessary for the diagnosis of AP but they are fundamental tools for the identification of the cause, degree severity and AP complications. AP severity assessment is in fact one of the most important issue in disease management. Contrast-enhanced CT is preferred in the emergency setting and is considered the gold standard in patients with AP. MRI is comparable to CT for the diagnosis of AP but requires much more time so it is not usually chosen in the emergency scenario. Complications of AP can be distinguished in localized and generalized. Among the localized complications, we can identify: acute peripancreatic fluid collections (APFC), pseudocysts, acute necrotic collections (ANC), walled off pancreatic necrosis (WOPN), venous thrombosis, pseudoaneurysms and haemorrhage. Multiple organ failure syndrome (MOFS) and sepsis are possible generalized complications of AP. In this review, we focus on CT and MRI findings in local complications of AP and when and how to perform CT and MRI. We paid also attention to recent developments in diagnostic classification of AP complications

Study of energetic properties of different tree organs in six Olea europaea L. cultivars

Pruning is an important horticultural practice for the management of olive orchards (Olea europaea L.) that generates a considerable amount of residues every year. Olive orchards are increasingly expanding beyond the Mediterranean Basin to new growing Countries (Australia, California, Argentina, Chile and Uruguay) and this will certainly lead to larger availability of pruning material. Currently, the interest in use of olive tree pruning residues for energy purposes is increasing but unfortunately, the information on the differences among organs of the tree, in terms of calorific value and ash content, is scarce. Another unknown aspect is the effect of cultivar vigour on dry matter partition among different tree organs, these are important traits to establish the energetic quality of pruning residues. The aim of this research was to study energetic aspects of six olive cultivars, largely grown in the Sicilian olive industry and characterized by different vigour. The trees taken into consideration in the study were selected in an experimental orchard to avoid any effect due to differences in environmental conditions and management. The energetic characteristics, calorific value and ash content, were evaluated for the various tree organs particularly shoots, leaves and branches; also root system was evaluated, although the roots can only be used once the trees are uprooted. Significant differences were observed in the calorific values among the different tree organs and the cultivars. Regarding the ash, shoots and leaves showed the highest content with respect to the other organs, thus causing a possible tendency in slagging with fouling and corrosion of boiler components

Potential Activity of Albino Grifola frondosa Mushroom Extract against Biofilm of Meticillin-Resistant Staphylococcus aureus

Mushroom extracts are a rich source of natural compounds with antimicrobial properties, which are able to prevent, to some extent, the growth of foodborne pathogens. The aim of this study was to investigate the potential of extracts from albino Grifola frondosa (GF), commonly known as maitake, to inhibit the growth of some bacteria and the biofilm production by Staphylococcus aureus. We obtained not only a significant reduction of OD score between biofilm and biofilm plus albino G. frondosa extract group, but also a reduction of category of biofilm. In addition, we observed a significant presence of isolates with strong category for the biofilm group and a significant presence of isolates with absent category for the biofilm plus albino G. frondosa extract group. These results confirm that the use of albino G. frondosa extract reduces in significant way the presence of biofilm. Our results suggest and confirm that albino G. frondosa extracts could be employed as functional food and could be used as a natural additive for food process control and food safety

Magnetic resonance imaging of the cirrhotic liver in the era of gadoxetic acid

Gadoxetic acid improves detection and characterization of focal liver lesions in cirrhotic patients and can estimate liver function in patients undergoing liver resection. The purpose of this article is to describe the optimal gadoxetic acid study protocol for the liver, the unique characteristics of gadoxetic acid, the differences between gadoxetic acid and extra-cellular gadolium chelates, and the differences in phases of enhancement between cirrhotic and normal liver using gadoxetic acid. We also discuss how to obtain and recognize an adequate hepatobiliary phase

Gentrification and health in two global cities : a call to identify impacts for socially-vulnerable residents

Unidad de excelencia María de Maeztu MdM-2015-0552In global cities, the impacts of gentrification on the lives and well-being of socially vulnerable residents have occupied political agendas. Yet to date, research on how gentrification affects a multiplicity of health outcomes has remained scarce. While much of the nascent quantitative research helps to identify associations between gentrification and determined health outcomes, it tends to draw from static datasets collected for other studies to draw a posteriori and non-longitudinal conclusions. There is little attention in traditional public health research to purposely understand the health impacts of the complex, multi-layered, and rapid change produced by gentrification. Moreover, few studies examine the pathways and socio-spatial dynamics of the association between gentrification and health. In response, we use qualitative data collected in Boston and Barcelona to comprehensively identify how the health and well-being of long-term residents may be affected by gentrification and to call for new multi-methods research. In this initial assessment, we find a range of potential detrimental factors and potential pathways associated with gentrification, including individual-level physical and mental health outcomes such as obesity, asthma, chronic stress, and depression; neighborhood-level health determinants such as safety and new drug-dealing/use; and institutional-level health determinants such as healthcare precarity and worsened school conditions

An unusual association of diffuse adenomyomatosis with dysplastic adenoma in chronic calculous cholecystitis: case presentation

<p>Abstract</p> <p>Background</p> <p>Gallbladder adenomyomatosis is an epithelial proliferation and hypertrophy of the muscularis mucosae of the gallbladder. Rokitansky-Aschoff sinuses are a characteristic of this condition. The segmental adenomyomatosis has a higher risk of developing into gallbladder carcinoma, especially in the fundal region of elderly patients.</p> <p>We report the case of a patient affected by chronic calculous cholecystitis with diffuse adenomyomatosis associated with dysplastic adenoma.</p> <p>Case presentation</p> <p>An 81-year-old woman presented at our hospital with a 1-year history of intermittent pain localized at the right upper abdominal quadrant, without diffusion to any other body part. On physical examination the abdomen was soft, not distended, and tender to palpation in the right upper quadrant. Murphy sign was negative. Laboratory tests were normal. The patient was scheduled for a laparoscopic cholecystectomy, and neither endoscopic ultrasonographic scan nor magnetic resonance imaging was performed. The operation, performed after obtaining informed consent, was uncomplicated and the intra-operative pathological examination showed no malignancy. The definitive pathological examination of the gallbladder showed: multiple stones of cholesterol origin; diffuse mucosal adenomyomatosis; and a 1.1 cm pedunculated mass localized at the fundus, whose surface was lumpy. This mass was diagnosed as an adenoma with multiple areas of severe dysplasia.</p> <p>Conclusions</p> <p>The adenoma of the gallbladder, together with the dysplasia, represents a biological carcinogenetic model. Carcinoma has rarely been reported in adenomyomatosis. Degenerative risk suggests surgery should be mandatory when there is a concomitant presence of large adenoma and adenomyomatosis.</p