2,197 research outputs found
A bifibrational reconstruction of Lawvere's presheaf hyperdoctrine
Combining insights from the study of type refinement systems and of monoidal
closed chiralities, we show how to reconstruct Lawvere's hyperdoctrine of
presheaves using a full and faithful embedding into a monoidal closed
bifibration living now over the compact closed category of small categories and
distributors. Besides revealing dualities which are not immediately apparent in
the traditional presentation of the presheaf hyperdoctrine, this reconstruction
leads us to an axiomatic treatment of directed equality predicates (modelled by
hom presheaves), realizing a vision initially set out by Lawvere (1970). It
also leads to a simple calculus of string diagrams (representing presheaves)
that is highly reminiscent of C. S. Peirce's existential graphs for predicate
logic, refining an earlier interpretation of existential graphs in terms of
Boolean hyperdoctrines by Brady and Trimble. Finally, we illustrate how this
work extends to a bifibrational setting a number of fundamental ideas of linear
logic.Comment: Identical to the final version of the paper as appears in proceedings
of LICS 2016, formatted for on-screen readin
FUS-CHOP promotes invasion in myxoid liposarcoma through a SRC/FAK/RHO/ROCK-dependent pathway
Deregulated SRC/FAK signaling leads to enhanced migration and invasion in many types of tumors. In myxoid and round cell liposarcoma (MRCLS), an adipocytic tumor characterized by the expression of the fusion oncogene FUS-CHOP, SRC have been found as one of the most activated kinases. Here we used a cell-of-origin model of MRCLS and an MRCLS cell line to thoroughly characterize the mechanisms of cell invasion induced by FUS-CHOP using in vitro (3D spheroid invasion assays) and in vivo (chicken chorioallantoic membrane model) approaches. FUS-CHOP expression activated SRC-FAK signaling and increased the invasive ability of MRCLS cells. In addition, FAK expression was found to significantly correlate with tumor aggressiveness in sarcoma patient samples. The involvement of SRC/FAK activation in FUS-CHOP–mediated invasion was further confirmed using the SRC inhibitor dasatinib, the specific FAK inhibitor PF-573228, and FAK siRNA. Notably, dasatinib and PF573228 could also efficiently block the invasion of cancer stem cell subpopulations. Downstream of SRC/FAK signaling, we found that FUS-CHOP expression increases the levels of the RHO/ROCK downstream effector phospho-MLC2 (T18/S19) and that this activation was prevented by dasatinib or PF573228. Moreover, the ROCK inhibitor RKI-1447 was able to completely abolish invasion in FUS-CHOP–expressing cells. These data uncover the involvement of SRC/FAK/RHO/ROCK signaling axis in FUS-CHOP–mediated invasion, thus providing a rationale for testing inhibitors of this pathway as potential novel antimetastatic agents for MRCLS treatmentPeer ReviewedPostprint (author's final draft
Espondilitis tuberculosa no es una metástasis vertebral: diagnóstico diferencial y tratamiento quirúrgico. A propósito de un caso
Presentamos el caso de una paciente con dorsalgia y clÃnica neurológica de varios meses de evolución
que ante las pruebas de imagen fue erróneamente diagnosticada de metástasis vertebral sin confirmación previa
con biopsia. El deterioro progresivo neurológico y las nuevas pruebas de imagen confirmaron el diagnóstico de tuberculosis
vertebral. La paciente fue tratada mediante curetaje, desbridamiento, fusión intersomática y osteosÃntesis anterior
además del tratamiento médico. Hubo una recuperación neurológica de la función sensitiva, motora y esfinteriana
prácticamente completa al mes de la intervención. Tras 20 meses de evolución la paciente está asintomática sin
evidencia de progresión de la enfermedadWe report a patient with back pain and neurological symptoms several months of evolution to the test
image was wrongly diagnosed with spinal metastases without prior confirmation with biopsy. The progressive deterioration
of neurological and new imaging confirmed the diagnosis of spinal tuberculosis. The patient was treated by
curettage, debridement, anterior interbody fusion and internal fixation in addition to medical treatment. There neurological
recovery of sensory function, motor and sphincter almost complete month after the intervention. After 20
months of evolution, the patient is asymptomatic without evidence of disease progressio
EP-1362: Influence of the phantom material on the absorbed-dose energy dependence of the EBT3 radiochromic film
The Role of Green Infrastructure in Urban and Peri-urban Areas in Latin American: a Case Study in Cuenca, Ecuador
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive
Prostate cancer, PI3K, PTEN and prognosis
Loss of function of the PTEN tumour suppressor, resulting in dysregulated activation of the phosphoinositide 3-kinase (PI3K) signalling network, is recognized as one of the most common driving events in prostate cancer development. The observed mechanisms of PTEN loss are diverse, but both homozygous and heterozygous genomic deletions including PTEN are frequent, and often accompanied by loss of detectable protein as assessed by immunohistochemistry (IHC). The occurrence of PTEN loss is highest in aggressive metastatic disease and this has driven the development of PTEN as a prognostic biomarker, either alone or in combination with other factors, to distinguish indolent tumours from those likely to progress. Here, we discuss these factors and the consequences of PTEN loss, in the context of its role as a lipid phosphatase, as well as current efforts to use available inhibitors of specific components of the PI3K/PTEN/TOR signalling network in prostate cancer treatment.</jats:p
A Fuzzy Syllogistic Reasoning Schema for Generalized Quantifiers
In this paper, a new approximate syllogistic reasoning schema is described
that expands some of the approaches expounded in the literature into two ways:
(i) a number of different types of quantifiers (logical, absolute,
proportional, comparative and exception) taken from Theory of Generalized
Quantifiers and similarity quantifiers, taken from statistics, are considered
and (ii) any number of premises can be taken into account within the reasoning
process. Furthermore, a systematic reasoning procedure to solve the syllogism
is also proposed, interpreting it as an equivalent mathematical optimization
problem, where the premises constitute the constraints of the searching space
for the quantifier in the conclusion.Comment: 22 pages, 6 figures, journal pape
Flue gas adsorption by single-wall carbon nanotubes: A Monte Carlo study
Adsorption of flue gases by single-wall carbon nanotubes (SWCNT) has been studied by means of
Monte Carlo simulations. The flue gas is modeled as a ternary mixture of N2, CO2, and O2, emulating
realistic compositions of the emissions from power plants. The adsorbed flue gas is in equilibrium
with a bulk gas characterized by temperature T, pressure p, and mixture composition.We have considered
different SWCNTs with different chiralities and diameters in a range between 7 and 20 Ã…. Our
results show that the CO2 adsorption properties depend mainly on the bulk flue gas thermodynamic
conditions and the SWCNT diameter. Narrow SWCNTs with diameter around 7 Ã… show high CO2
adsorption capacity and selectivity, but they decrease abruptly as the SWCNT diameter is increased.
For wide SWCNT, CO2 adsorption capacity and selectivity, much smaller in value than for the narrow
case, decrease mildly with the SWCNT diameter. In the intermediate range of SWCNT diameters,
the CO2 adsorption properties may show a peculiar behavior, which depend strongly on the bulk flue
gas conditions. Thus, for high bulk CO2 concentrations and low temperatures, the CO2 adsorption
capacity remains high in a wide range of SWCNT diameters, although the corresponding selectivity
is moderate.We correlate these findings with the microscopic structure of the adsorbed gas inside the
SWCNTs.Peer reviewe
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