Single-Shot Smartphone-Based Quantitative Phase Imaging Using a Distorted Grating

<div><p>Blood testing has been used as an essential tool to diagnose diseases for decades. Recently, there has been a rapid developing trend in using Quantitative Phase Imaging (QPI) methods for blood cell screening. Compared to traditional blood testing techniques, QPI has the advantage of avoiding dyeing or staining the specimen, which may cause damage to the cells. However, most existing systems are bulky and costly, requiring experienced personnel to operate. This work demonstrates the integration of one QPI method onto a smartphone platform and the application of imaging red blood cells. The adopted QPI method is based on solving the Intensity Transport Equation (ITE) from two de-focused pupil images taken in one shot by the smartphone camera. The device demonstrates a system resolution of about 1 μm, and is ready to be used for 3D morphological study of red blood cells.</p></div

Gas surrounding the urinary bladder in emphysematous cystitis

<div><p>ABSTRACT We report a rare case of emphysematous cystitis in a 66-year-old woman with a history of diabetes mellitus. The predisposition of diabetes mellitus and infection of gas-forming bacteria is considered to precede the manifestation of emphysematous cystitis. The present recommended diagnosis test is computed tomography, which have definite value in the evaluation of gas accumulation in bladder wall, or an air-fluid level in bladder.</p></div

Late Devonian closure of the North Qilian Ocean: evidence from detrital zircon U–Pb geochronology and Hf isotopes in the eastern North Qilian Orogenic Belt

<div><p>The closure age of the North Qilian Ocean, which lay between the Alashan Terrane and Central Qilian Block during the early Palaeozoic, is intensely debated. This article presents a provenance study of detrital materials from three Upper Devonian sedimentary formations in the Pingchuan area of Gansu Province in the eastern North Qilian Orogenic Belt (NQOB), to constrain the tectonic evolution of the belt. U–Pb dating and Lu–Hf isotopic studies were conducted on detrital zircons from samples of sedimentary rocks. Four age populations of U–Pb zircon ages are defined as: 0.5–0.4 Ga (peak at 472 Ma); 0.8–1.3 Ga (peaks at 960 Ma and 1102 Ma); 1.8–2.1 Ga (two prominent peaks at 1963 Ma and 2045 Ma, and two subordinate peaks at 1816 Ma and 2168 Ma); and 2.4–2.5 Ga (peak at 2495 Ma). Zircons with U–Pb age spectra of 1.8–2.1 Ga and their corresponding εHf(t) values are markedly different from those of the North China Block, Dunhuang Terrane, and Central Qilian Block, but have a strong similarity to zircons from the Alashan Terrane. Furthermore, zircons with ages ranging from 1.8 to 2.1 Ga are reported for the first time in early Palaeozoic strata of the eastern NQOB. The presence of Alashan-derived clasts in the Upper Devonian strata in the NQOB indicates that the sediments were deposited after amalgamation between the Alashan and Qilian terranes. Combined with previous geochronological and geochemical data from the early Palaeozoic igneous and sedimentary rocks, we propose that the closure of the North Qilian Ocean occurred in the Late Devonian. The similar age spectra of detrital zircons from sediments of the Alashan, Cathaysia, and Australia imply that the Alashan–Qilian–Qaidam block was probably located in the periphery of Gondwana in the early Palaeozoic.</p></div

Conjugate planes in the conventional WCS setup.

<p>Conjugate planes in the conventional WCS setup.</p

Single-Shot Smartphone-Based Quantitative Phase Imaging Using a Distorted Grating - Fig 4

<p>(a) Regular optical grating is consisted of periodical straight lines; (b) Quadratically distorted grating lines in a circular aperture; (c) Fabricated grating masks for smartphone devices, each of the dark circles is a mask; (d) System structure of the prototyping system.</p

Exemplary results of using the smartphone-based wavefront sensor for red blood cell imaging.

<p>(a) A raw photo taken by the smartphone camera, consisting of 3 images of the pupil; (b) Pre-selected and cut images for the wavefront computing algorithm; (c) Calculated phase map; (d) Reconstructed height map.</p

Resulting image of using the smartphone-based system to image the USAF resolution target.

<p>The system demonstrates the capability of resolving the 6^th element of group 7 on the resolution target, which has a line width around 2 μm.</p

Additional file 3 of Predicting sepsis onset in ICU using machine learning models: a systematic review and meta-analysis

Additional file 3

Additional file 1 of Predicting sepsis onset in ICU using machine learning models: a systematic review and meta-analysis

Additional file 1. PRISMA 2020 Checklist

Additional file 2 of Predicting sepsis onset in ICU using machine learning models: a systematic review and meta-analysis

Additional file 2