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https://www.readbyqxmd.com/read/28431348/evaluation-of-structural-effects-on-the-flocculation-performance-of-a-co-graft-starch-based-flocculant
#1
Zhouzhou Liu, Hua Wei, Aimin Li, Hu Yang
The molecular structure of a material substantially determines its final application performance. In this work, a series of starch-based flocculants with different charge densities and average graft chain lengths were prepared by the co-graft polymerization of acrylamide and [(2-methacryloyloxyethyl) trimethyl ammonium chloride] (St-g-PAM-co-PDMC). The flocculation performance of St-g-PAM-co-PDMC was studied systematically at neutral pH using kaolin suspension and sodium humate (NaHA) aqueous solution as synthetic wastewaters...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28431328/effects-of-quantum-dots-on-the-ros-amount-of-liver-cancer-stem-cells
#2
Kunmeng Li, Chunhui Xia, Baiqi Wang, Hetao Chen, Tong Wang, Qian He, Hailong Cao, Yu Wang
Liver cancer (LC) is a serious disease that threatens human lives. LC has a high recurrence rate and poor prognosis. LC stem cells (LCSCs) play critical roles in these processes. However, the mechanism remains unclear. Reactive oxygen species (ROS) can be used to determine cell apoptosis and proliferation. However, studies of the effects of exogenous nanomaterials on LCSC ROS changes are rarely reported. In this work, quantum dots (QDs) were prepared using a hydrothermal method, and QDs were further modified with polyethylene glycol (PEG) and bovine serum albumin (BSA) using a chemical approach...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28431323/transcranial-magnetic-stimulation-in-developmental-stuttering-relations-with-previous-neurophysiological-research-and-future-perspectives
#3
REVIEW
P Busan, P P Battaglini, M Sommer
Developmental stuttering (DS) is a disruption of the rhythm of speech, and affected people may be unable to execute fluent voluntary speech. There are still questions about the exact causes of DS. Evidence suggests there are differences in the structure and functioning of motor systems used for preparing, executing, and controlling motor acts, especially when they are speech related. Much research has been obtained using neuroimaging methods, ranging from functional magnetic resonance to diffusion tensor imaging and electroencephalography/magnetoencephalography...
April 3, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28430121/synthesis-characterization-and-enhanced-sensing-properties-of-a-nio-zno-p-n-junctions-sensor-for-the-sf%C3%A2-decomposition-byproducts-so%C3%A2-so%C3%A2-f%C3%A2-and-sof%C3%A2
#4
Hongcheng Liu, Qu Zhou, Qingyan Zhang, Changxiang Hong, Lingna Xu, Lingfeng Jin, Weigen Chen
The detection of partial discharge and analysis of the composition and content of sulfur hexafluoride SF₆ gas components are important to evaluate the operating state and insulation level of gas-insulated switchgear (GIS) equipment. This paper reported a novel sensing material made of pure ZnO and NiO-decorated ZnO nanoflowers which were synthesized by a facile and environment friendly hydrothermal process for the detection of SF₆ decomposition byproducts. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to characterize the structural and morphological properties of the prepared gas-sensitive materials...
April 21, 2017: Sensors
https://www.readbyqxmd.com/read/28429740/micelle-template-synthesis-of-hollow-silica-spheres-for-improving-water-vapor-permeability-of-waterborne-polyurethane-membrane
#5
Yan Bao, Tong Wang, Qiaoling Kang, Chunhua Shi, Jianzhong Ma
Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429527/balancing-health-care-education-and-patient-care-in-the-uk-workplace-a-realist-synthesis
#6
Sarah Sholl, Rola Ajjawi, Helen Allbutt, Jane Butler, Divya Jindal-Snape, Jill Morrison, Charlotte Rees
CONTEXT: Patient care activity has recently increased without a proportionate rise in workforce numbers, impacting negatively on health care workplace learning. Health care professionals are prepared in part by spending time in clinical practice, and for medical staff this constitutes a contribution to service. Although stakeholders have identified the balance between health care professional education and patient care as a key priority for medical education research, there have been very few reviews to date on this important topic...
April 20, 2017: Medical Education
https://www.readbyqxmd.com/read/28429419/semi-synthesis-of-murine-prion-protein-by-native-chemical-ligation-and-chemical-activation-for-preparation-of-polypeptide-%C3%AE-thioester
#7
Lei Shi, Huai Chen, Si-Yu Zhang, Ting-Ting Chu, Yu-Fen Zhao, Yong-Xiang Chen, Yan-Mei Li
Prions are suspected as pathogen of the fatal transmissible spongiform encephalopathies. Strategies to access homogenous prion protein (PrP) are required to fully comprehend the molecular mechanism of prion diseases. However, the polypeptide fragments from PrP show a high tendency to form aggregates, which is a gigantic obstacle of protein synthesis and purification. In this study, murine prion sequence 90 to 230 that is the core three-dimensional structure domain was constructed from three segments murine PrP (mPrP)(90-177), mPrP(178-212), and mPrP(213-230) by combining protein expression, chemical synthesis and chemical ligation...
April 21, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28428993/from-nano-to-microcrystals-effects-of-different-synthetic-pathways-on-the-defect-architecture-in-heavily-gd-doped-ceria
#8
M Coduri, M Scavini, M Pani, M M Carnasciali, H Klein, C Artini
The evolution of the defect structure and microstructure of heavily Gd-doped ceria (Ce1-μREμO2-y, 0.313 ≤ μ ≤ 0.438) for different synthetic pathways is investigated here to explore the way defects interact with each other in a composition range known to effectively hamper the application of the material as an electrolyte. Synchrotron radiation powder diffraction is exploited by combining conventional Rietveld analysis with the Pair Distribution Function to get a multiscale picture of defect structures, and it is combined with Raman spectroscopy to assess local scale interactions...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28428090/preparation-and-characterization-of-lipid-nanoparticle-pdna-complexes-for-stat3-downregulation-and-overcoming-chemotherapy-resistance-in-lung-cancer-cells
#9
Mustafa Kotmakçı, Vildan Bozok Çetintaş, A Gülten Kantarcı
Developments in the field of molecular oncology have revealed that resistance to chemotherapeutics is acqured through several mechanisms including overexpression of common oncogenic proteins. Signal Transducer and Activator of Transcription 3 (STAT3) is one of these oncogenes that is overexpressed in many cancer types. RNA interference (RNAi) is proven powerful tool for downregulating STAT3, allowing re-sensitization of resistant cancer cells. However, delivery of RNA interference-mediating molecules for STAT3 downregulation in lung cancer cells is limited to a small number of studies most of which employ commercially available transfection kits...
April 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28427651/ultrasonic-synthesis-of-two-nanostructured-cadmium-ii-coordination-supramolecular-polymers-solvent-influence-luminescence-and-photocatalytic-properties
#10
Shao Yun Hao, Xue Gang Ma, Guang Hua Cui
Two nanoparticles of cadmium(II) coordination polymers (CPs) formulated as [Cd(L)(DCTP)]n (1) and [Cd(L)2(DCTP)·2H2O]n (2) (L=1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2DCTP=2,5-dichloroterephthalic acid) were prepared by the sonochemical approach in different solvents and characterized by elemental analysis, IR spectra, scanning electron microscopy (SEM), and powder X-ray diffraction. Structural determination reveals that CP 1 displays a 2D four-connected sql net layer, Whilst CP 2 exhibits a 1D "V"-like chain structure...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427646/investigate-the-ultrasound-energy-assisted-adsorption-mechanism-of-nickel-ii-ions-onto-modified-magnetic-cobalt-ferrite-nanoparticles-multivariate-optimization
#11
Fatemeh Mehrabi, Ebrahim Alipanahpour Dil
In present study, magnetic cobalt ferrite nanoparticles modified with (E)-N-(2-nitrobenzylidene)-2-(2-(2-nitrophenyl)imidazolidine-1-yl) ethaneamine (CoFe2O4-NPs-NBNPIEA) was synthesized and applied as novel adsorbent for ultrasound energy assisted adsorption of nickel(II) ions (Ni(2+)) from aqueous solution. The prepared adsorbent characterized by Fourier transforms infrared spectroscopy (FT-IR), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD). The dependency of adsorption percentage to variables such as pH, initial Ni(2+) ions concentration, adsorbent mass and ultrasound time were studied with response surface methodology (RSM) by considering the desirable functions...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427633/an-efficient-approach-for-the-extraction-of-orientin-and-vitexin-from-trollius-chinensis-flowers-using-ultrasonic-circulating-technique
#12
Fengli Chen, Qiang Zhang, Junling Liu, Huiyan Gu, Lei Yang
Ultrasonic circulating extraction (UCE) approach was developed for effective extraction of orientin and vitexin from the flowers of Trollius chinensis successfully. In this study, some parameters potentially influencing the yields of orientin and vitexin were systematically investigated and optimized by Plackett-Burman and Box-Behnken design, and the optimum operational conditions obtained were 60% ethanol volume fraction, 1000r/min stirring speed, 30°C temperature, 28min ultrasonic irradiation time, 10mL/g liquid-solid ratio and 738W ultrasonic irradiation power...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427629/development-of-a-novel-folate-modified-nanobubbles-with-improved-targeting-ability-to-tumor-cells
#13
Sujuan Duan, Lu Guo, Dandan Shi, Mengmeng Shang, Dong Meng, Jie Li
Conjugation of folate (FOL) to nanobubbles could enhance the selective targeting to tumors expressing high levels of folate receptor (FR). To further improve the selective targeting ability of FOL-modified nanobubbles, a novel FOL-targeted nanobubble ((FOL)2-NB) with increasing FOL content (accomplished by linking two FOL molecules per DSPE-PEG2000 chain) was synthesized, through the methods of mechanical shaking and low-speed centrifugation based on lipid-stabilized perfluoropropane. The bubble size and distribution range were measured by dynamic light scattering (DLS)...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427530/phenolic-compounds-and-its-bioavailability-in-vitro-bioactive-compounds-or-health-promoters
#14
Isabel C F R Ferreira, Natália Martins, Lillian Barros
Botanical preparations present a widespread and secular history of use. In fact, natural matrices possess a rich pool of phytochemicals, with promising biological effects. Among them, phenolic compounds have revealed to confer very important attributes to improve the well-being and longevity of worldwide population. Numerous in vitro studies have been carried out evaluating the wide spectrum of bioactivities of phenolic compounds, including its health effects, but through in vivo experiments some of these previous results cannot be properly confirmed, and considerable variations are observed...
2017: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/28427461/inhibitory-activities-of-selected-sudanese-medicinal-plants-on-porphyromonas-gingivalis-and-matrix-metalloproteinase-9-and-isolation-of-bioactive-compounds-from-combretum-hartmannianum-schweinf-bark
#15
Ebtihal Abdalla M Mohieldin, Ali Mahmoud Muddathir, Tohru Mitsunaga
BACKGROUND: Periodontal diseases are one of the major health problems and among the most important preventable global infectious diseases. Porphyromonas gingivalis is an anaerobic Gram-negative bacterium which has been strongly implicated in the etiology of periodontitis. Additionally, matrix metalloproteinases-9 (MMP-9) is an important factor contributing to periodontal tissue destruction by a variety of mechanisms. The purpose of this study was to evaluate the selected Sudanese medicinal plants against P...
April 20, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28427352/point-of-sampling-detection-of-zika-virus-within-a-multiplexed-kit-capable-of-detecting-dengue-and-chikungunya
#16
Ozlem Yaren, Barry W Alto, Priyanka V Gangodkar, Shatakshi R Ranade, Kunal N Patil, Kevin M Bradley, Zunyi Yang, Nikhil Phadke, Steven A Benner
BACKGROUND: Zika, dengue, and chikungunya are three mosquito-borne viruses having overlapping transmission vectors. They cause diseases having similar symptoms in human patients, but requiring different immediate management steps. Therefore, rapid (< one hour) discrimination of these three viruses in patient samples and trapped mosquitoes is needed. The need for speed precludes any assay that requires complex up-front sample preparation, such as extraction of nucleic acids from the sample...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28427209/hif1%C3%AE-regulates-single-differentiated-glioma-cell-dedifferentiation-to-stem-like-cell-phenotypes-with-high-tumorigenic-potential-under-hypoxia
#17
Pan Wang, Chuan Lan, Shuanglong Xiong, Xiuwen Zhao, You'an Shan, Rong Hu, Wenwu Wan, Shuangjiang Yu, Bin Liao, Guangzhi Li, Junwei Wang, Dewei Zou, Bing Chen, Hua Feng, Nan Wu
The standard treatment for Glioblastoma multiforme (GBM) is surgical resection and subsequent radiotherapy and chemotherapy. Surgical resection of GBM is typically restricted because of its invasive growth, which results in residual tumor cells including glioma stem cells (GSCs) and differentiated cells. Recurrence has been previously thought to occur as a result of these GSCs, and hypoxic microenvironment maintains the GSCs stemness also plays an important role. Summarizing traditional studies and we find many researchers ignored the influence of hypoxia on differentiated cells...
March 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28427016/synthesis-and-in%C3%A2-vitro-antitumour-activity-of-crassalactone-d-its-stereoisomers-and-novel-cinnamic-ester-derivatives
#18
Ivana Kovačević, Mirjana Popsavin, Goran Benedeković, Jelena Kesić, Vesna Kojić, Dimitar Jakimov, Tatjana Srdić-Rajić, Gordana Bogdanović, Vladimir Divjaković, Velimir Popsavin
Naturally occurring styryl lactone, crassalactone D (1), unnatural 4-epi-crassalactone D (2), and the corresponding 7-epimers (3 and 4) have been synthesized starting from d-glucose. The key step of the synthesis is a new one-pot sequence that commenced with a Z-selective Wittig olefination of suitably functionalized sugar lactols with a stabilized ylide, (methoxycarbonylmethylene)-triphenylphosphorane, in dry methanol, to afford 1 or 3, in the mixtures with the corresponding 4-epimers (2 or 4, respectively)...
April 13, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28426690/phenotypic-characterization-and-anticancer-capacity-of-cd8-cytokine-induced-killer-cells-after-antigen-induced-expansion
#19
Jianhua Liu, Lu Wang, Yaoling Wang, Wenjie Zhang, Yilin Cao
Cytokine-induced killer cells (CIK) have been used in clinic for adoptive immunotherapy in a variety of malignant tumors and have improved the prognosis of cancer patients. However, there are individual differences in the CIK cell preparations including the obvious differences in the ratio of effector CIK cells among different cancer patients. Infusion of such heterogeneous immune cell preparation is an important factor that would affect the therapeutic efficacy. We report here the enrichment and expansion of CD8+ cells from CIK cells cultured for one week using magnetic activated cell sorting (MACS)...
2017: PloS One
https://www.readbyqxmd.com/read/28426420/disruption-of-egg-production-by-triclabendazole-resistant-fasciola-hepatica-following-treatment-with-a-commercial-preparation-of-myrrh-mirazid
#20
Mohamed M O Abdelaal, Gerard P Brennan, Robert E B Hanna, Ahmed Abdel-Aziz, Ian Fairweather
An in vitro study has been carried out to monitor changes to the female reproductive system in adult triclabendazole (TCBZ)-resistant Fasciola hepatica following treatment with a commercial preparation of myrrh ("Mirazid"). Flukes were immersed for 6 h and 24 h in myrrh extract at a concentration of 200 µg/ml, then processed for histological and transmission electron microscope (TEM) examination of the uterus, Mehlis' gland, ovary and vitellaria. Egg production had become abnormal at 6 h post-treatment (pt), with the uterine lumen being filled with free vitelline cells and masses of shell protein material; few eggs were present...
June 1, 2017: Acta Parasitologica
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