70 research outputs found
Non-Associative Geometry of Quantum Tori
We describe how to obtain the imprimitivity bimodules of the noncommutative
torus from a "principal bundle" construction, where the total space is a
quasi-associative deformation of a 3-dimensional Heisenberg manifold
Some remarks on K-lattices and the Adelic Heisenberg Group for CM curves
We define an adelic version of a CM elliptic curve which is equipped with
an action of the profinite completion of the endomorphism ring of . The
adelic elliptic curve so obtained is provided with a natural embedding into the
adelic Heisenberg group. We embed into the adelic Heisenberg group the set of
commensurability classes of arithmetic -dimensional -lattices
(here and subsequently, denotes a quadratic imaginary number
field) and define theta functions on it. We also embed the groupoid of
commensurability modulo dilations into the union of adelic Heisenberg groups
relative to a set of representatives of elliptic curves with -multiplication
( is the ring of algebraic integers of ). We thus get adelic
theta functions on the set of -dimensional -lattices and on the
groupoid of commensurability modulo dilations. Adelic theta functions turn out
to be acted by the adelic Heisenberg group and behave nicely under complex
automorphisms (Theorems 6.12 and 6.14).Comment: 25 pages, no figures. Extensively revised version according to the
comments of the reviewer
Modules over the Noncommutative Torus and Elliptic Curves
Using the Weil-Brezin-Zak transform of solid state physics, we describe line
bundles over elliptic curves in terms of Weyl operators. We then discuss the
connection with finitely-generated projective modules over the algebra
of the noncommutative torus. We show that such -modules
have a natural interpretation as Moyal deformations of vector bundles over an
elliptic curve , under the condition that the deformation parameter
and the modular parameter satisfy a non-trivial relation.Comment: 16 pages, no figures; v2: minor correction
On the pseudo-manifold of quantum states
There are various statements in the physics literature about the
stratification of quantum states, for example into orbits of a unitary group,
and about generalized differentiable structures on it. Our aim is to clarify
and make precise some of these statements. For A an arbitrary
finite-dimensional C*-algebra and U(A) the group of unitary elements of A, we
observe that the partition of the state space S(A) into U(A) orbits is not a
decomposition and that the decomposition into orbit types is not a
stratification (its pieces are not manifolds without boundary), while there is
a natural Whitney stratification into matrices of fixed rank. For the latter,
when A is a full matrix algebra, we give an explicit description of the
pseudo-manifold structure (the conical neighborhood around any point). We then
make some comments about the infinite-dimensional case.Comment: 18 pages, 4 figure
A Brain-Inspired Trust Management Model to Assure Security in a Cloud based IoT Framework for Neuroscience Applications
Rapid popularity of Internet of Things (IoT) and cloud computing permits
neuroscientists to collect multilevel and multichannel brain data to better
understand brain functions, diagnose diseases, and devise treatments. To ensure
secure and reliable data communication between end-to-end (E2E) devices
supported by current IoT and cloud infrastructure, trust management is needed
at the IoT and user ends. This paper introduces a Neuro-Fuzzy based
Brain-inspired trust management model (TMM) to secure IoT devices and relay
nodes, and to ensure data reliability. The proposed TMM utilizes node
behavioral trust and data trust estimated using Adaptive Neuro-Fuzzy Inference
System and weighted-additive methods respectively to assess the nodes
trustworthiness. In contrast to the existing fuzzy based TMMs, the NS2
simulation results confirm the robustness and accuracy of the proposed TMM in
identifying malicious nodes in the communication network. With the growing
usage of cloud based IoT frameworks in Neuroscience research, integrating the
proposed TMM into the existing infrastructure will assure secure and reliable
data communication among the E2E devices.Comment: 17 pages, 10 figures, 2 table
A SERS affinity bioassay based on ion-exchanged glass microrods
14noThe well-known enhancement effect of surface-enhanced Raman spectroscopy (SERS) is associated with the presence of metallic nanostructures at the substrate surface. Different bottom-up and top-down processes have been proposed to impart the substrate with such a nanostructured layer. The former approaches are low cost but may suffer from reusability and stability. The latter strategies are expensive, time consuming and require special equipment that complicate the fabrication process. Here, we present the possibility to obtain stable and reusable SERS substrates by a low-cost silver-sodium ion-exchange process in soda-lime glass microrods. The microrods were obtained by cutting the tip of the ion-exchanged soda-lime fiber, resulting in disks of about few millimeters in length and one hundred microns in diameter. A thermal annealing post-process was applied to trigger the reduction of Ag+ ions into nanoparticles (AgNPs) within the ion-exchanged glass microrods. Afterwards, ion-exchange and thermal treatments were carefully tuned to assure the presence of silver NPs exposed on the surface of the microrods, without using any chemical etching. An AFM analysis confirmed the presence of AgNPs with size of tens of nm on the surface of the fiber probe. A SERS affinity bioassay was developed on the probe with the final aim of detecting microRNA fragments acting as biomarkers of different diseases. Specifically a DNA hybridization assay was built up by anchoring a molecular beacon containing a Raman tag on the Ag surface via thiol chemistry. Initial SERS experiments confirmed the presence of the beacon on the NPs embedded on the microrods surface, as monitored by detecting main spectral bands ascribed to the oligonucleotide chain. Finally, the ability of the platform to interact with the target microRNA sequence was assessed. The analysis was repeated on a number of miRNA sequences differing from the target to evaluate the specificity of the proposed assay.openopenBerneschi, Simone; D'Andrea, Cristiano; Giannetti, Ambra; De Angelis, Marella; Banchelli, Martina; Barucci, Andrea; Boetti, Nadia Giovanna; Pelli, Stefano; Baldini, Francesco; Pini, Roberto; Janner, Davide; Pugliese, Diego; Milanese, Daniel; Matteini, PaoloBerneschi, Simone; D'Andrea, Cristiano; Giannetti, Ambra; De Angelis, Marella; Banchelli, Martina; Barucci, Andrea; Boetti, Nadia Giovanna; Pelli, Stefano; Baldini, Francesco; Pini, Roberto; Janner, Davide; Pugliese, Diego; Milanese, Daniel; Matteini, Paol
Ion-exchanged glass microrods for SERS detection of DNA
Different chemical or physical deposition processes have been previously proposed to equip surfaces with a layer of plasmonic NPs to produce effective SERS responses. Here, we present a SERS biosensor obtained by an ion-exchange process in soda-lime glass microrods for efficient DNA detection
Loss of CDKN1B induces an age‐related clonal hematopoietic disorder via Notch2 activity dysregulation
No abstract availabl
En bloc resection of bladder tumour : the rebirth of past through reminiscence
© 2023. The Author(s).Peer reviewedPublisher PD
GADD45β loss ablates innate immunosuppression in cancer
T cell exclusion from the tumour microenvironment (TME) is a major barrier to overcoming immune escape. Here we identify a myeloid-intrinsic mechanism governed by the NF-κB effector molecule GADD45β that restricts tumour-associated inflammation and T cell trafficking into tumours. In various models of solid cancers refractory to immunotherapies, including hepatocellular carcinoma (HCC) and ovarian adenocarcinoma, Gadd45b inhibition in myeloid cells restored activation of pro-inflammatory tumour-associated macrophages (TAM) and intratumoural immune infiltration, thereby diminishing oncogenesis. Our results provide a basis to interpret clinical evidence that elevated expression of GADD45B confers poor clinical outcomes in most human cancers. Further, they suggest a therapeutic target in GADD45β for re-programming TAM to overcome immunosuppression and T cell exclusion from the TME
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