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https://www.readbyqxmd.com/read/28937637/adsorption-mechanisms-of-dodecylbenzene-sulfonic-acid-by-corn-straw-and-poplar-leaf-biochars
#1
Nan Zhao, Xixiang Yang, Jing Zhang, Ling Zhu, Yizhong Lv
Biochar is an eco-friendly, renewable, and cost-effective material that can be used as an adsorbent for the remediation of contaminated environments. In this paper, two types of biochar were prepared through corn straw and poplar leaf pyrolysis at 300 °C and 700 °C (C300, C700, P300, P700). Brunaer-Emmett-Teller N₂ surface area, scanning electron microscope, elemental analysis, and infrared spectra were used to characterize their structures. These biochars were then used as adsorbents for the adsorption of dodecylbenzene sulfonic acid (DBSA)...
September 22, 2017: Materials
https://www.readbyqxmd.com/read/28934911/characterization-and-phenol-adsorption-performance-of-activated-carbon-prepared-from-tea-residue-by-naoh-activation
#2
Jun Tao, Peili Huo, Zongheng Fu, Jin Zhang, Zhen Yang, Dengfeng Zhang
The preparation of activated carbon (AC) using tea residue as precursor was fully addressed in this work. The preparation process mainly incorporated two-step pyrolysis and activation using NaOH. The influence of activation temperature ranging between 500 and 700 (o)C on the properties of the obtained AC sample was investigated. The physicochemical properties of the prepared AC sample were characterized using N2 adsorption/desorption, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)...
September 22, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28933685/adsorption-of-re-3-from-aqueous-solutions-by-bayberry-tannin-immobilized-on-chitosan
#3
Xianying Qiu, Yueyue Shen, Ruilin Yang, Hongcheng Zhang, Shilin Zhao
Bayberry tannin immobilized on chitosan (CS-BT) was successfully prepared, and its adsorption performance was studied for aqueous solutions of rare earth ions. The as-prepared absorbents were characterized by Fourier transform infrared spectrometry and scanning electron microscopy. The equilibrium adsorption capacity was achieved in approximately 30 min. The adsorption process of CS-BT for Nd(3+) ion was well fitted with a Freundlich model. Sorption of Nd(3+) onto CS-BT could be well described by the pseudo second-order kinetics...
September 21, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28931946/comparison-of-perfusion-models-for-quantitative-t1-weighted-dce-mri-of-rectal-cancer
#4
Tanja Gaa, Wiebke Neumann, Sonja Sudarski, Ulrike I Attenberger, Stefan O Schönberg, Lothar R Schad, Frank G Zöllner
In this work, the two compartment exchange model and two compartment uptake model were applied to obtain quantitative perfusion parameters in rectum carcinoma and the results were compared to those obtained by the deconvolution algorithm. Eighteen patients with newly diagnosed rectal carcinoma underwent 3 T MRI of the pelvis including a T1 weighted dynamic contrastenhanced (DCE) protocol before treatment. Mean values for Plasma Flow (PF), Plasma Volume (PV) and Mean Transit Time (MTT) were obtained for all three approaches and visualized in parameter cards...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931429/portal-vein-embolization-with-n-butyl-cyanoacrylate-through-an-ipsilateral-approach-before-major-hepatectomy-single-center-analysis-of-50-consecutive-patients
#5
José Hugo Mendes Luz, Paula Mendes Luz, Tiago Bilhim, Henrique Salas Martin, Hugo Rodrigues Gouveia, Élia Coimbra, Filipe Veloso Gomes, Roberto Romulo Souza, Igor Murad Faria, Tiago Nepomuceno de Miranda
PURPOSE: To evaluate the efficacy of portal vein embolization (PVE) with n-Butyl-cyanoacrylate (NBCA) through an ipsilateral approach before major hepatectomy. Secondary end-points were PVE safety, liver resection and patient outcome. METHODS: Over a 5-year period 50 non-cirrhotic consecutive patients were included with primary or secondary liver cancer treatable by hepatectomy with a liver remnant (FLR) volume less than 25% or less than 40% in diseased livers. RESULTS: There were 37 men and 13 women with a mean age of 57 years...
September 20, 2017: Cancer Imaging: the Official Publication of the International Cancer Imaging Society
https://www.readbyqxmd.com/read/28929978/a-new-study-of-the-kinetics-of-curd-production-in-the-process-of-cheese-manufacture
#6
Susana Vargas Muñoz, Maykel González Torres, Francisco Quintanilla Guerrero, Rogelio Rodríguez Talavera
We studied the role played by temperature and rennet concentration in the coagulation process for cheese manufacture and the evaluation of their kinetics. We concluded that temperature is the main factor that determines the kinetics. The rennet concentration was unimportant probably due to the fast action of the enzyme chymosin. The Dynamic light scattering technique allowed measuring the aggregate's size and their formation kinetics. The volume fraction of solids was determined from viscosity measurements, showing profiles that are in agreement with the size profiles...
September 20, 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/28929924/the-search-for-a-subtype-selective-pet-imaging-agent-for-the-gabaa-receptor-complex-evaluation-of-the-radiotracer-11-c-ado-in-nonhuman-primates
#7
Shu-Fei Lin, Frederic Bois, Daniel Holden, Nabeel Nabulsi, Richard Pracitto, Hong Gao, Michael Kapinos, Jo-Ku Teng, Anupama Shirali, Jim Ropchan, Richard E Carson, Charles S Elmore, Neil Vasdev, Yiyun Huang
The myriad physiological functions of γ-amino butyric acid (GABA) are mediated by the GABA-benzodiazepine receptor complex comprising of the GABAA, GABAB, and GABAC groups. The various GABAA subunits with region-specific distributions in the brain subserve different functional and physiological roles. For example, the sedative and anticonvulsive effects of classical benzodiazepines are attributed to the α1 subunit, and the α2 and α3 subunits mediate the anxiolytic effect. To optimize pharmacotherapies with improved efficacy and devoid of undesirable side effects for the treatment of anxiety disorders, subtype-selective imaging radiotracers are required to assess target engagement at GABA sites and determine the dose-receptor occupancy relationships...
January 2017: Molecular Imaging
https://www.readbyqxmd.com/read/28929243/discrimination-between-benign-and-malignant-breast-lesions-using-volumetric-quantitative-dynamic-contrast-enhanced-mr-imaging
#8
Ziliang Cheng, Zhuo Wu, Guangzi Shi, Zhilong Yi, Mingwei Xie, Weike Zeng, Chao Song, Chushan Zheng, Jun Shen
OBJECTIVE: To determine the diagnostic performance of volumetric quantitative dynamic contrast-enhanced MRI (qDCE-MRI) in differentiation between malignant and benign breast lesions. METHODS: DCE-MRI was performed in 124 patients with 136 breast lesions. Quantitative pharmacokinetic parameters K(trans), Kep, Ve, Vp and semi-quantitative parameters TTP, MaxCon, MaxSlope, AUC were obtained by using a two-compartment extended Tofts model and three-dimensional volume of interest...
September 19, 2017: European Radiology
https://www.readbyqxmd.com/read/28926716/broadband-acoustic-resonance-dissolution-spectroscopy-bards-a-novel-approach-to-investigate-the-wettability-of-pharmaceutical-powder-blends
#9
Raghu V G Peddapatla, M Rizwan Ahmed, Caroline A Blackshields, M J Sousa-Gallagher, Sean McSweeney, J Krüse, Abina M Crean, Dara Fitzpatrick
The ability of Broadband Acoustic Resonance Dissolution Spectroscopy (BARDS) to assess the wettability of powder blends is investigated. BARDS is a novel analytical technology developed based on the change in acoustic phenomenon observed when material is added into a solvent under resonance. Addition of solid material to the solvent results in the introduction of gas (air) into the solvent, changing the compressibility of the solvent system and reducing the velocity of sound in the solvent. As a material is wetted and dissolved, the gas is released from the solvent and resonance frequency is altered...
September 19, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28925167/-analysis-on-intestinal-absorption-of-paeoniflorin-lipid-liquid-crystalline-nanoparticles-via-everted-intestinal-sacs
#10
Shuang Teng, Ling Qiu, Hong-Ge Chen, Bao-de Shen, Cheng-Ying Shen, Ping-Hua Xu, Jin Han, Hai-Long Yuan
To study the absorption kinetics of paeoniflorin lipid liquid crystalline nanoparticles (Pae-LLCN) in different intestinal segments of rats and compare them with paeoniflorin(Pae) solution. Rat everted gut sac models were adopted for intestinal absorption test, and Pae content was determined by HPLC method to study the absorption characteristics of Pae-LLCN in rat duodenum, jejunum, ileum and colon, and investigate the effects of different drug concentrations on intestinal absorption. Results showed that Pae-LLCN and Pae were well absorbed at different intestine segments and different concentrations...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28924199/bio-butanol-sorption-performance-on-novel-porous-carbon-adsorbents-from-corncob-prepared-via-hydrothermal-carbonization-and-post-pyrolysis-method
#11
Mengjun Han, Kangkang Jiang, Pengfei Jiao, Yingchun Ji, Jingwei Zhou, Wei Zhuang, Yong Chen, Dong Liu, Chenjie Zhu, Xiaochun Chen, Hanjie Ying, Jinglan Wu
A series of porous-carbon adsorbents termed as HDPC (hydrochar-derived pyrolysis char) were prepared from corncob and used for the 1-butanol recovery from aqueous solution. The influences of pyrolysis temperature on properties of the adsorbents were systematically investigated. The results showed that hydrophobicity, surface area, and pore volume of HDPC samples increased with an increase in pyrolysis temperature. Furthermore, the adsorption mechanism of 1-butanol on the adsorbents was explored based on correlation of the samples properties with adsorption parameters extracted from the 1-butanol adsorption isotherms (K F and Q e12 )...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28923739/droplet-impact-on-superhydrophobic-surfaces-fully-decorated-with-cylindrical-macrotextures
#12
Mehran Abolghasemibizaki, Reza Mohammadi
HYPOTHESIS: Impacting on a superhydrophobic surface, water droplet spreads to a pancake shape and then retracts and bounces off. Although the collision time is mostly in the order of couple of 10ms for millimetric droplets, researchers have shown recently that decorating the superhydrophobic surface with a single macrotexture or intersecting ridge reduces this contact time if the droplet hits the texture or the intersection exactly in the center. Hence, covering the surface with ridges should address this hitting point restriction...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28918080/the-tail-of-two-models-impact-of-circularity-and-biomass-non-homogeneity-on-uv-disinfection-of-wastewater-flocs
#13
Y Azimi, Y Liu, T C Tan, D G Allen, R R Farnood
The effects of floc structural characteristics, i.e. shape and dense biomass distribution, were evaluated on ultraviolet (UV) disinfection resistance, represented by the tailing level of the UV dose response curve (DRC). Ellipsoid-shaped flocs of similar volume and different projected circularities were constructed in-silico and a mathematical model was developed to compare their UV DRC tailing levels (indicative of UV-resistance). It was found that floc shape can significantly influence tailing level, and rounder flocs (i...
September 6, 2017: Water Research
https://www.readbyqxmd.com/read/28917253/re-irradiation-with-stereotactic-body-radiation-therapy-sbrt
#14
Morten Høyer
Stereotactic body radiation therapy (SBRT) is a potential treatment option for patients who develop a relapse within or marginal to a previously irradiated volume, but it seems underused because of sparse knowledge on the efficacy and morbidity related to the treatment. Normal tissues often recover some of the damage caused by the primary radiotherapy with time, but the kinetics of recovery is not clearly described in the literature. There is a growing number of publications on SBRT reirradiation, but the literature consists mainly of retrospective cohort studies...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28915903/a-quantitative-assessment-of-the-evolution-of-cerebellar-syndrome-in-children-with-phosphomannomutase-deficiency-pmm2-cdg
#15
Natalia Lourdes Serrano, Victor De Diego, Daniel Cuadras, Antonio F Martinez Monseny, Ramón Velázquez-Fragua, Laura López, Ana Felipe, Luis G Gutiérrez-Solana, Alfons Macaya, Belén Pérez-Dueñas, Mercedes Serrano
BACKGROUND: We aim to delineate the progression of cerebellar syndrome in children with phosphomannomutase-deficiency (PMM2-CDG) using the International Cooperative Ataxia Rating Scale (ICARS). We sought correlation between cerebellar volumetry and clinical situation. We prospectively evaluated PMM2-CDG patients aged from 5 to 18 years through ICARS at two different time points set apart by at least 20 months. We reviewed available MRIs and performed volumetric analysis when it was possible...
September 15, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28912893/the-role-of-nitric-oxide-during-sonoreperfusion-of-microvascular-obstruction
#16
Francois T H Yu, Xucai Chen, Adam C Straub, John J Pacella
Rationale: Microembolization during PCI for acute myocardial infarction can cause microvascular obstruction (MVO). MVO severely limits the success of reperfusion therapies, is associated with additional myonecrosis, and is linked to worse prognosis, including death. We have shown, both in in vitro and in vivo models, that ultrasound (US) and microbubble (MB) therapy (termed "sonoreperfusion" or "SRP") is a theranostic approach that relieves MVO and restores perfusion, but the underlying mechanisms remain to be established...
2017: Theranostics
https://www.readbyqxmd.com/read/28905393/pet-motion-correction-in-context-of-integrated-pet-mr-current-techniques-limitations-and-future-projections
#17
REVIEW
Ashley Gillman, Stephen Rose, Jye Smith, Paul Thomas, Nicholas Dowson
Patient motion is an important consideration in modern PET image reconstruction. Advances in PET technology mean motion has an increasingly important influence on resulting image quality. Motion-induced artefacts can have adverse effect on clinical outcomes, including missed diagnoses and oversized radiotherapy treatment volumes. This review aims to summarise the wide variety of motion correction techniques available in PET and combined PET/CT and PET/MR, with a focus on the latter. A general framework for the motion correction of PET images is presented, consisting of acquisition, modelling and correction stages...
September 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/28895034/whole-body-biodistribution-and-the-influence-of-body-activity-on-brain-kinetic-analysis-of-the-11-c-pib-pet-scan
#18
Go Akamatsu, Tomoyuki Nishio, Kazuhiko Adachi, Yasuhiko Ikari, Michio Senda
Dynamic (11)C-PiB PET imaging with kinetic analysis has been performed for accurate quantification of amyloid binding in patients with Alzheimer's disease (AD). In this study, we measured the whole-body biodistribution of (11)C-PiB in nine subjects. We then evaluated the effect of body activity on quantitative accuracy of brain (11)C-PiB three-dimensional (3D) dynamic PET. Based on clinical biodistribution data, we conducted phantom experiments to estimate the effect of body activity on quantification of the brain 3D dynamic (11)C-PiB PET data and the error introduced by body activity using six different PET camera models...
September 11, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28894197/a-multi-institutional-comparison-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-parameter-calculations
#19
Rachel B Ger, Abdallah S R Mohamed, Musaddiq J Awan, Yao Ding, Kimberly Li, Xenia J Fave, Andrew L Beers, Brandon Driscoll, Hesham Elhalawani, David A Hormuth, Petra J van Houdt, Renjie He, Shouhao Zhou, Kelsey B Mathieu, Heng Li, Catherine Coolens, Caroline Chung, James A Bankson, Wei Huang, Jihong Wang, Vlad C Sandulache, Stephen Y Lai, Rebecca M Howell, R Jason Stafford, Thomas E Yankeelov, Uulke A van der Heide, Steven J Frank, Daniel P Barboriak, John D Hazle, Laurence E Court, Jayashree Kalpathy-Cramer, Clifton D Fuller
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) provides quantitative metrics (e.g. K(trans), ve) via pharmacokinetic models. We tested inter-algorithm variability in these quantitative metrics with 11 published DCE-MRI algorithms, all implementing Tofts-Kermode or extended Tofts pharmacokinetic models. Digital reference objects (DROs) with known K(trans) and ve values were used to assess performance at varying noise levels. Additionally, DCE-MRI data from 15 head and neck squamous cell carcinoma patients over 3 time-points during chemoradiotherapy were used to ascertain K(trans) and ve kinetic trends across algorithms...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893984/nanoswitch-linked-immunosorbent-assay-nlisa-for-fast-sensitive-and-specific-protein-detection
#20
Clinton H Hansen, Darren Yang, Mounir A Koussa, Wesley P Wong
Protein detection and quantification play critical roles in both basic research and clinical practice. Current detection platforms range from the widely used ELISA to more sophisticated, and more expensive, approaches such as digital ELISA. Despite advances, there remains a need for a method that combines the simplicity and cost-effectiveness of ELISA with the sensitivity and speed of modern approaches in a format suitable for both laboratory and rapid, point-of-care applications. Building on recent developments in DNA structural nanotechnology, we introduce the nanoswitch-linked immunosorbent assay (NLISA), a detection platform based on easily constructed DNA nanodevices that change conformation upon binding to a target protein with the results read out by gel electrophoresis...
September 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
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