keyword
https://read.qxmd.com/read/38546150/deswelling-mechanisms-of-pnipam-grafted-in-nanochannels-a-molecular-dynamics-simulation-study
#1
JOURNAL ARTICLE
Xian-Zhi Chen, Dong Niu, Hong-Tao Gao, Mu Du
Porous thermosensitive hydrogels exhibit a more flexible strategy for freshwater capture compared to conventional hydrogels. This study employs molecular dynamics (MD) simulation to investigate the deswelling behavior of poly( N -isopropylacrylamide) (PNIPAM) grafted within the nanochannel, aiming to elucidate the deswelling elimination process at various temperatures. Notably, a distinct phase separation is observed at specific temperatures above the lower solution temperature (LCST). Furthermore, this study takes the effect of heat flux into account, wherein distinct heat fluxes lead to varying levels of phase separation between water and the polymer...
March 28, 2024: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/38543654/effect-of-the-inoculum-to-substrate-ratio-on-putative-pathogens-and-microbial-kinetics-during-the-batch-anaerobic-digestion-of-simulated-food-waste
#2
JOURNAL ARTICLE
Saanu Victoria Otite, Bhushan P Gandhi, Esther Agyabeng Fofie, Alfonso José Lag-Brotons, Lawrence I Ezemonye, Alastair D Martin, Roger W Pickup, Kirk T Semple
The effects of the inoculum (anaerobic digestion effluent) to substrate (simulated food waste) ratio (ISR) 4.00 to 0.25 on putative pathogens and microbial kinetics during batch mesophilic anaerobic digestion were investigated. Red fluorescent protein labelled (RFPAKN132) Escherichia coli JM105 was introduced as a marker species, and together with the indigenous Clostridium sp., Enterococcus sp., Escherichia coli , and total coliforms were used to monitor pathogen death kinetics. Quantitative polymerase chain reaction was also used to estimate the bacterial, fungal, and methanogenic gene copies...
March 18, 2024: Microorganisms
https://read.qxmd.com/read/38543004/tailoring-the-formation-of-functionalized-furans-from-glucose-in-water-with-nature-sourced-catalysts-and-in-situ-nmr
#3
JOURNAL ARTICLE
Stefan S Warthegau, Sebastian Meier
Chain elongation of unprotected carbohydrates in water under mild conditions remains a challenge both in chemical and biochemical synthesis. The Knoevenagel addition or condensation enables transformations to bioactive scaffolds for pharmaceutical and agrochemical compounds. Unfortunately, the catalysts in use for these transformations often reduce the green metrics of the transformations. Here, we use in situ NMR visualizations to explore the prospective use of natural catalysts for the synthesis of triple- and quadruple-functionalized furan- or dihydrofuran-derivatives from glucose and malononitrile...
March 19, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38542893/silver-nanoparticle-embedded-hydrogels-for-electrochemical-sensing-of-sulfamethoxazole-residues-in-meat
#4
JOURNAL ARTICLE
Yuanxi Deng, Ningning Yang
A disposable electrochemical sensor based on silver nanoparticle-embedded cellulose hydrogel composites was developed for sensitive detection of sulfamethoxazole residues in meat samples. Scanning electron microscopy confirmed the porous structure of the cellulose matrix anchored with 20-50 nm silver nanoparticles (AgNPs). Fourier transform infrared spectroscopy and X-ray diffraction verified that the metallic AgNPs coordinated with the amorphous cellulose chains. At an optimum 0.5% loading, the nanocomposite sensor showed a peak-to-peak separation of 150 mV, diffusion-controlled charge transfer kinetics, and an electron transfer coefficient of 0...
March 12, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38542256/the-impact-of-candida-albicans-in-the-development-kinetics-structure-and-cell-viability-of-biofilms-on-implant-surfaces-an-in-vitro-study-with-a-validated-multispecies-biofilm-model
#5
JOURNAL ARTICLE
Enrique Bravo, Marion Arce, Honorato Ribeiro-Vidal, David Herrera, Mariano Sanz
This study aimed to evaluate the impact of Candida albicans on subgingival biofilm formation on dental implant surfaces. Scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) were used to compare biofilm structure and microbial biomass in the presence and absence of the fungus after periods of 24, 48, and 72 h. Quantitative polymerase chain reaction (qPCR) was used to quantify the number of viable and total micro-organisms for each of the biofilm-forming strains. A general linear model was applied to compare CLSM and qPCR results between the control and test conditions...
March 14, 2024: International Journal of Molecular Sciences
https://read.qxmd.com/read/38541838/effects-of-telerehabilitation-combining-diaphragmatic-breathing-re-education-and-shoulder-stabilization-exercises-on-neck-pain-posture-and-function-in-young-adult-men-with-upper-crossed-syndrome-a-randomized-controlled-trial
#6
JOURNAL ARTICLE
Gyeong-Hyeon Jeong, Byoung-Hee Lee
Background: Forward head posture and rounded shoulder posture are common postural variants found in upper crossed syndrome, which can lead to limited neck mobility, respiratory problems, and other issues. The purpose of this study was to investigate the effects of telerehabilitation, combining diaphragmatic breathing re-education and shoulder stabilization exercises, on young men with upper crossed syndrome during the COVID-19 pandemic over 4 weeks. Methods: The study included 37 participants aged in their 20s and 30s who were randomly divided into two groups...
March 11, 2024: Journal of Clinical Medicine
https://read.qxmd.com/read/38538999/efficient-fluoride-removal-using-nano-mgo-mechanisms-and-performance-evaluation
#7
JOURNAL ARTICLE
BoWen Liu, Li Ai, Ming Lei, Hongfei Lin
In this study, highly efficient fluoride removal of nano MgO was successfully synthesized using a simple hydrothermal precipitation method. Hexadecyl trimethyl ammonium bromide (CTMAB) was utilized as a surfactant. Its long-chain structure tightly wrapped around the precursor crystal of basic magnesium chloride, inhibiting the growth of precursor crystals, reducing their size, and improving crystal dispersion. This process enhanced the adsorption capacity of nano MgO for fluoride. The adsorption performance of nano MgO on fluoride was investigated...
March 28, 2024: Environmental Science and Pollution Research International
https://read.qxmd.com/read/38537849/evaluating-physiochemical-characteristics-of-tragacanth-gum-gelatin-network-hydrogels-designed-through-graft-copolymerization-technique
#8
JOURNAL ARTICLE
Nistha Thakur, Baljit Singh
The present work deals with the evaluation of the physiochemical and biomedical properties of hydrogels derived from copolymerization of tragacanth gum (TG) and gelatin for use in drug delivery (DD) applications. Copolymers were characterized by field emission-scanning electron micrographs (FE-SEM), electron dispersion X-ray analysis (EDAX), Fourier transform infrared spectroscopy (FTIR), 13 C-nuclear magnetic resonance (NMR), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analysis...
March 25, 2024: International Journal of Biological Macromolecules
https://read.qxmd.com/read/38537356/sensitive-and-label-free-spr-biosensing-platforms-for-high-throughput-screening-of-plasma-membrane-receptors-interactions-with-insulin-like-targets-of-hypoglycaemic-activity
#9
JOURNAL ARTICLE
Marcin Drozd, Ewa Kobylska, Małgorzata Żmieńko, Michał Chudy
Progress in medical sciences aims for tailored therapy of civilization diseases like diabetes. Preclinical screening of new medicines superior to insulin should include the verification of their affinity to the membrane receptors naturally stimulated by this hormone: insulin receptor isoforms A and B and insulin-like growth factor receptor. Considering that the affinity constants obtained using different experimental conditions are incomparable, it is essential to develop a robust and reliable method to analyze these interactions...
March 26, 2024: Talanta
https://read.qxmd.com/read/38536820/changes-in-sars-cov-2-viral-load-and-titers-over-time-in-sars-cov-2-infected-human-corpses
#10
JOURNAL ARTICLE
Sayaka Nagasawa, Yuichiro Hirata, Sho Miyamoto, Seiya Ozono, Shun Iida, Harutaka Katano, Shigeki Tsuneya, Kei Kira, Susumu Kobayashi, Makoto Nakajima, Hiroyuki Abe, Masako Ikemura, Isao Yamamoto, Kimiko Nakagawa, Kazumi Kubota, Shinji Akitomi, Iwao Hasegawa, Tetsuo Ushiku, Tadaki Suzuki, Hirotaro Iwase, Yohsuke Makino, Hisako Saitoh
High viral titers of infectious severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have been detected in human corpses long after death. However, little is known about the kinetics of infectious SARS-CoV-2 in corpses. In this case series study, we investigated the postmortem kinetics of infectious SARS-CoV-2 in human corpses by collecting nasopharyngeal swab samples at multiple time points from six SARS-CoV-2-infected patients after their death. SARS-CoV-2 RNA was detected by quantitative reverse transcription-polymerase chain reaction from nasopharyngeal swab samples collected from all six deceased patients...
2024: PloS One
https://read.qxmd.com/read/38535698/short-chain-sulfur-confined-into-nitrogen-doped-hollow-carbon-nanospheres-for-high-capacity-potassium-storage
#11
JOURNAL ARTICLE
Wenhan Liu, Tengfei Shi, Fang Liu, Chen Yang, Fan Qiao, Kang Han, Chunhua Han, Jiashen Meng, Xuanpeng Wang
Carbon-based materials are one of the ideal negative electrode materials for potassium ion batteries. However, the limited active sites and sluggish diffusion ion kinetics still hinder its commercialization process. To address these problems, we design a novel carbon composite anode, by confining highly reactive short-chain sulfur molecules into nitrogen-doped hollow carbon nanospheres (termed SHC-450). The formation process involves the controlled synthesis of hollow polyaniline (PANI) nanospheres as precursors via an Ostwald ripening mechanism and subsequent sulfuration treatment...
March 20, 2024: Nanomaterials
https://read.qxmd.com/read/38533585/the-effects-of-shoulder-stabilization-exercises-on-muscle-strength-proprioceptive-sensory-ability-and-performance-in-office-workers-with-shoulder-protraction
#12
JOURNAL ARTICLE
O Depreli, Z Erden
Objectives . Shoulder protraction is frequently seen in office workers because of working with excessive trunk flexion for a long time. This study aimed to compare the effectiveness of stabilization exercises (SE) given in addition to office exercises (OE). Methods . Sixty office workers with shoulder protraction were divided into SE + OE ( n =  30) and OE ( n =  30) groups by stratified random sampling for 8 weeks and followed up for 4 weeks. Shoulder protraction was assessed with a caliper, muscle strength with a hand-held dynamometer, proprioception with an isokinetic dynamometer, vibration sense with a vibrometer and upper extremity functional performance with the closed kinetic chain upper extremity stability test...
March 27, 2024: International Journal of Occupational Safety and Ergonomics: JOSE
https://read.qxmd.com/read/38532730/the-thermal-decomposition-mechanism-of-rdx-ap-composites-ab-initio-neural-network-md-simulations
#13
JOURNAL ARTICLE
Kehui Pang, Mingjie Wen, Xiaoya Chang, Yabei Xu, Qingzhao Chu, Dongping Chen
A neural network potential (NNP) is developed to investigate the decomposition mechanism of RDX, AP, and their composites. Utilizing an ab initio dataset, the NNP is evaluated in terms of atomic energy and forces, demonstrating strong agreement with ab initio calculations. Numerical stability tests across a range of timesteps reveal excellent stability compared to the state-of-the-art ReaxFF models. Then the thermal decomposition of pure RDX, AP, and RDX/AP composites is performed using NNP to explore the coupling effect between RDX and AP...
March 27, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38528006/clean-up-of-divalent-cobalt-ions-by-massive-sequestration-in-a-low-cost-calcium-silicate-hydrate-material
#14
JOURNAL ARTICLE
Andrea Hamilton, Pieter Bots, Han Zhou, Bao Liu, Christopher Hall
Cobalt is a critical resource in industrial economies for the manufacture of electric-vehicle batteries, alloys, magnets, and catalysts, but has acute supply-chain risks and poses a threat to the environment. Large-scale sequestration of cobalt in low-cost materials under mild conditions opens a path to cobalt recycling, recovery and environmental clean-up. We describe such sequestration of cobalt by a widely available commercial calcium silicate material containing the mineral xonotlite. Xonotlite rapidly and spontaneously takes up 40 percent of its weight of cobalt under ambient conditions of temperature and pressure and reduces dissolved cobalt concentrations to low parts per million...
March 25, 2024: Scientific Reports
https://read.qxmd.com/read/38527876/degradation-behaviors-of-nabumetone-and-its-metabolite-during-uv-monochloramine-process-experimental-and-theoretical-study
#15
JOURNAL ARTICLE
Xiang Tu, Yunsong Bai, Qing Fu, Sheng Chang, Kunfeng Zhang, Yang Pan, Ruiyang Xiao, Yifu Fu, Qi Zhang
This study investigated degradation behaviors of a nonsteroidal anti-inflammatory drug Nabumetone (NMT) and its major metabolite 6-methoxy-2-naphthylacetic acid (MNA) in the coupling process of ultraviolet and monochloramine (UV/NH2 Cl). The second-order rate constants of the contaminants reacting with reactive radicals (HO•, Cl•, Cl2 •⁻ , and CO3 •⁻ ) were determined by laser flash photolysis experiments. HO• and Cl• contributed predominantly with 52...
August 2024: Journal of Environmental Sciences (China)
https://read.qxmd.com/read/38527630/enhancing-walking-performance-in-patients-with-peripheral-arterial-disease-an-intervention-with-ankle-foot-orthosis
#16
JOURNAL ARTICLE
Farahnaz Fallahtafti, Kaeli Samson, Zahra Salamifar, Jason Johanning, Iraklis Pipinos, Sara A Myers
Lower extremity peripheral artery disease (PAD) is a cardiovascular condition manifesting from narrowed or blocked arteries supplying the legs. Gait is impaired in patients with PAD. Recent evidence suggests that walking with carbon fiber ankle foot orthoses (AFOs) can improve patient mobility and delay claudication time. This study aimed to employ advanced biomechanical gait analysis to evaluate the impact of AFO intervention on gait performance among patients with PAD. Patients with claudication had hip, knee, and ankle joint kinetics and kinematics assessed using a cross-over intervention design...
March 23, 2024: International Journal of Cardiology
https://read.qxmd.com/read/38527535/sustainable-application-of-surfactants-in-soil-remediation-selective-pollutants-adsorption-and-hydrogen-peroxide-driven-adsorbent-regeneration
#17
JOURNAL ARTICLE
Andrés Sánchez-Yepes, Aurora Santos, Arturo Romero, David Lorenzo
The uncontrolled disposal of the liquid lindane wastes have led to the formation of dense non-aqueous phase liquids (DNAPL), consisting of 28 chlorinated organic compounds (COCs), contaminating soil and groundwater. Surfactant-enhanced aquifer remediation is proposed as technology to treat these sites. However, the polluted emulsion generated must be manged on-site. In this work a two-step process is applied to treat emulsion composed of E-Mulse® 3 (4 g·L-1 ) as surfactant and a DNAPL (2 gCOCs ·L-1 )...
March 23, 2024: Science of the Total Environment
https://read.qxmd.com/read/38526296/prognostic-value-of-poly-microorganisms-detected-by-droplet-digital-pcr-and-pathogen-load-kinetics-in-sepsis-patients-a-multi-center-prospective-cohort-study
#18
JOURNAL ARTICLE
Yuanhan Zhao, Ke Lin, Haocheng Zhang, Yanliang Zhang, Shaling Li, Shengguo Zhang, Wei Zhang, Aiming Zhou, Yangyang Zhuang, Jie Chen, Caixia Wu, Wei Zhou, Xiaoju He, Qiaoyan Yue, Meng Zhang, Yan Huang, Liang Li, Liang Hong, Fujing Cai, Lisu Huang, Zhengshang Ruan, Shanshan Xu, Yan Zhang, Xiaohua Chen, Jie Chen, Ying Ye, Tingting Bian, Jiabin Li, Jun Yin, Xiang Li, Lijing Jiang, Chen Lei, Jun Liu, Ying Zhang, Jialin Jin, Jingwen Ai, Jingye Pan, Wenhong Zhang
This study aimed to investigate the prognostic value of a novel droplet digital polymerase chain reaction (DDPCR) assay in sepsis patients. In this prospective cohort study, univariable and multivariable Cox regressions were used to assess risk factors for 28-day mortality. We also monitored pathogen load together with clinical indicators in a subgroup of the cohort. A total of 107 sepsis patients with positive baseline DDPCR results were included. Detection of poly-microorganisms [adjusted hazard ratio (HR) = 3...
March 25, 2024: Microbiology Spectrum
https://read.qxmd.com/read/38525800/clues-to-the-design-of-aggregation-resistant-insulin-from-proline-scanning-of-highly-amyloidogenic-peptides-derived-from-the-n-terminal-segment-of-the-a-chain
#19
JOURNAL ARTICLE
Wojciech Puławski, Robert Dec, Wojciech Dzwolak
Insulin aggregation poses a significant problem in pharmacology and medicine as it occurs during prolonged storage of the hormone and in vivo at insulin injection sites. We have recently shown that dominant forces driving the self-assembly of insulin fibrils are likely to arise from intermolecular interactions involving the N-terminal segment of the A-chain (ACC1-13 ). Here, we study how proline substitutions within the pilot GIVEQ sequence of this fragment affect its propensity to aggregate in both neutral and acidic environments...
March 25, 2024: Molecular Pharmaceutics
https://read.qxmd.com/read/38525510/an-investigation-into-the-frequency-and-risk-factors-of-low-back-pain-following-surgical-treatment-of-isolated-calcaneal-fractures
#20
JOURNAL ARTICLE
Dilek Bayraktar, Cengizhan Özgürbüz, Anıl Murat Öztürk, Salih Kemal Aktuğlu, Nadir Özkayın
OBJECTIVE: This study aimed to determine the frequency of low back pain after calcaneal fractures treated with open reduction internal fixation (ORIF) and the risk factors that cause this condition. METHODS: Thirty-one patients (27 males and 4 females) who underwent surgery for a unilateral calcaneal fracture between 2016 and 2020 and had no complaints of low back pain before fracture surgery were included in the study. The patients were divided into 2 groups: those who developed low back pain after the operation and those who did not...
January 2024: Acta Orthopaedica et Traumatologica Turcica
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