Elucidating Black α-CsPbI Perovskite Stabilization via PPD Bication-Conjugated Molecule Surface Passivation: Ab Initio Simulations.

The cubic α-CsPbI phase stands out as one of the most promising perovskite compounds for solar cell applications due to its suitable electronic band gap of 1.7 eV. However, it exhibits structural instability under operational conditions, often transforming into the hexagonal non-perovskite δ-CsPbI phase, which is unsuitable for solar cell applications because of the large band gap (e.

Atomic-scale insights in the interplay of chemical composition and chirality in two-dimensional chiral perovskites.

The incorporation of chiral molecules (A) in materials based on hybrid ABX perovskites has opened new paths to tune the optoelectronic properties of perovskites through the transfer of chirality to the inorganic BX framework. However, our atomistic understanding of the role of chemical BX composition in the magnitude of the chirality transfer is far from complete. In this study, we use density functional theory calculations and the experimental Ruddlesden-Popper chiral (-/-NEA)PbBr structure (-/-NEA = -/-1-(1-naphthyl)ethylammonium) to investigate the effects induced by chemical substitution of Pb by Ge or Sn and Br by Cl or I on the transfer of chirality and physical-chemical properties.

Decoding Van der Waals Impact on Chirality Transfer in Perovskite Structures: Density Functional Theory Insights.

Chiral organic-inorganic perovskites exhibit unique physicochemical properties driven by the symmetry of monovalent organic cations. However, an atomistic understanding of how chiral cations transfer their chirality to the inorganic framework and the role played by van der Waals (vdW) interactions in this process is still incomplete. In this work, we report a theoretical investigation, based on density functional theory calculations within the Perdew-Burke-Ernzerhof (PBE) formulation for the exchange-correlation functional, into the role of the vdW interactions in the chirality transfer process.

Time in range and HbA after 6 months with a multidisciplinary program for children and adolescents with diabetes mellitus, real world data from Mexico City.

Background: Multidisciplinary interventions may be useful for children and adolescents with diabetes mellitus (DM), especially in areas where new blood glucose monitoring and control technologies are difficult to access.

Methods: PAANDA, a care program for adolescents and children with diabetes, was implemented in patients aged 0 to 18 years and 11 months. The effect of the intervention was determined by self-blood glucose monitoring (SBGM) and glycosylated hemoglobin (HbA ) levels at start and after 6 months.

Association of preoperative spinal drain placement with spinal cord ischemia among patients undergoing thoracic and thoracoabdominal endovascular aortic repair.

Objective: Spinal cord ischemia (SCI) is among the most devastating complications of thoracic endovascular aortic repair (TEVAR). Spinal fluid drainage has been proposed as a viable means to reduce SCI, but few data exist to support its routine use. This study investigated the association of preoperative spinal fluid drainage with the risk of SCI after TEVAR.

Spectral-domain optical coherence tomography versus ultrasound biomicroscopy for imaging of nonpigmented iris tumors.

Purpose: To evaluate the use of spectral-domain optical coherence tomography (SDOCT) for imaging of nonpigmented iris tumors, through its comparison with ultrasound biomicroscopy (UBM).

Design: Retrospective observational case series.

Methods: Consecutive patients with non-pigmented iris tumors, not extending to the ciliary body, who were concurrently evaluated with SD-OCT and UBM were included.

Role of optical coherence tomography in verifying the specificity of ultrasonography in detecting subtle subretinal fluid associated with small choroidal melanocytic tumors.

Purpose: To report the use of optical coherence tomography (OCT) in verifying the specificity of the ultrasonographic "apical double echo" sign in detecting subtle subretinal fluid (SRF) associated with small choroidal melanocytic tumors.

Methods: Retrospective review of consecutive patients demonstrating ultrasonographic "apical double echo," indicative of subtle SRF, who concurrently underwent OCT on initial evaluation of untreated small choroidal melanocytic tumors. Ultrasonography was performed with eyecubed version 3, ophthalmic ultrasound system (Ellex/Innovative Imaging, Inc, Adelaide, Australia) and OCT with spectral-domain OCT, Cirrus HD-OCT, model 4000 (Carl Zeiss; Meditec, Dublin, CA).

Trefoil factor 3 isolated from human breast milk downregulates cytokines (IL8 and IL6) and promotes human beta defensin (hBD2 and hBD4) expression in intestinal epithelial cells HT-29.

Trefoil factors (TFF) are secretory products of mucin producing cells. They play a key role in the maintenance of the surface integrity of oral mucosa and enhance healing of the gastrointestinal mucosa by a process called restitution. TFF comprises the gastric peptides (TFF1), spasmolytic peptide (TFF2), and the intestinal trefoil factor (TFF3).

An outbreak of leptospirosis among Peruvian military recruits.

Acute undifferentiated febrile illnesses are common in tropical developing countries but are difficult to diagnose on clinical grounds alone. Leptospirosis is rarely diagnosed, despite evidence that sporadic cases and epidemics continue to occur worldwide. The purpose of this study was to diagnose an outbreak of acute undifferentiated febrile illness among Peruvian military recruits that developed after a training exercise in the high jungle rainforest of Peru.