keyword
MENU ▼
Read by QxMD icon Read
search

Separ

keyword
https://www.readbyqxmd.com/read/28335532/separation-of-alkyne-enantiomers-by-chiral-column-hplc-analysis-of-their-cobalt-complexes
#1
Qiaoyun Liu, Jing Wang, Junfei Li, Xiaolei Wang, Shichao Lu, Xuan Li, Yaling Gong, Shu Xu
Separation of the enantiomers of new chiral alkynes in strategic syntheses and bioorthogonal studies is always problematic. The chiral column high-performance liquid chromatography (HPLC) method in general could not be directly used to resolve such substrates, since the differentiation of the alkyne segment with the other alkane/alkene segment is not significant in the stationary phase, and the alkyne group is not a good UV chromophore. Usually, a pre-column derivatization reaction with a tedious workup procedure is needed...
March 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28335452/fabrication-and-water-treatment-application-of-carbon-nanotubes-cnts-based-composite-membranes-a-review
#2
REVIEW
Lining Ma, Xinfa Dong, Mingliang Chen, Li Zhu, Chaoxian Wang, Fenglin Yang, Yingchao Dong
Membrane separation technology is widely explored for various applications, such as water desalination and wastewater treatment, which can alleviate the global issue of fresh water scarcity. Specifically, carbon nanotubes (CNTs)-based composite membranes are increasingly of interest due to the combined merits of CNTs and membrane separation, offering enhanced membrane properties. This article first briefly discusses fabrication and growth mechanisms, characterization and functionalization techniques of CNTs, and then reviews the fabrication methods for CNTs-based composite membranes in detail...
March 18, 2017: Membranes
https://www.readbyqxmd.com/read/28335448/a-community-multi-omics-approach-towards-the-assessment-of-surface-water-quality-in-an-urban-river-system
#3
David J Beale, Avinash V Karpe, Warish Ahmed, Stephen Cook, Paul D Morrison, Christopher Staley, Michael J Sadowsky, Enzo A Palombo
A multi-omics approach was applied to an urban river system (the Brisbane River (BR), Queensland, Australia) in order to investigate surface water quality and characterize the bacterial population with respect to water contaminants. To do this, bacterial metagenomic amplicon-sequencing using Illumina next-generation sequencing (NGS) of the V5-V6 hypervariable regions of the 16S rRNA gene and untargeted community metabolomics using gas chromatography coupled with mass spectrometry (GC-MS) were utilized. The multi-omics data, in combination with fecal indicator bacteria (FIB) counts, trace metal concentrations (by inductively coupled plasma mass spectrometry (ICP-MS)) and in-situ water quality measurements collected from various locations along the BR were then used to assess the health of the river ecosystem...
March 14, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28335375/assessing-the-spectral-properties-of-sunlit-and-shaded-components-in-rice-canopies-with-near-ground-imaging-spectroscopy-data
#4
Kai Zhou, Xinqiang Deng, Xia Yao, Yongchao Tian, Weixing Cao, Yan Zhu, Susan L Ustin, Tao Cheng
Monitoring the components of crop canopies with remote sensing can help us understand the within-canopy variation in spectral properties and resolve the sources of uncertainties in the spectroscopic estimation of crop foliar chemistry. To date, the spectral properties of leaves and panicles in crop canopies and the shadow effects on their spectral variation remain poorly understood due to the insufficient spatial resolution of traditional spectroscopy data. To address this issue, we used a near-ground imaging spectroscopy system with high spatial and spectral resolutions to examine the spectral properties of rice leaves and panicles in sunlit and shaded portions of canopies and evaluate the effect of shadows on the relationships between spectral indices of leaves and foliar chlorophyll content...
March 13, 2017: Sensors
https://www.readbyqxmd.com/read/28335368/shape-evolution-of-hierarchical-w18o49-nanostructures-a-systematic-investigation-of-the-growth-mechanism-properties-and-morphology-dependent-photocatalytic-activities
#5
Guojuan Hai, Jianfeng Huang, Liyun Cao, Yanni Jie, Jiayin Li, Xing Wang
Hierarchical tungsten oxide assemblies such as spindle-like structures, flowers with sharp petals, nanowires and regular hexagonal structures are successfully synthesized via a solvothermal reduction method by simply adjusting the reaction conditions. On the basis of the experimental results, it is determined that the reaction time significantly influences the phase transition, microstructure and photocatalytic activity of the prepared samples. The possible mechanisms for the morphology evolution process have been systematically proposed...
December 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335334/hybrid-nanostructures-containing-sulfadiazine-modified-chitosan-as-antimicrobial-drug-carriers
#6
Bogdanel Silvestru Munteanu, Raluca Petronela Dumitriu, Lenuta Profire, Liviu Sacarescu, Gabriela Elena Hitruc, Elena Stoleru, Marius Dobromir, Ana Lavinia Matricala, Cornelia Vasile
Chitosan (CH) nanofibrous structures containing sulfadiazine (SDZ) or sulfadiazine modified chitosan (SCH) in the form of functional nanoparticles attached to nanofibers (hybrid nanostructures) were obtained by mono-axial and coaxial electrospinning. The mono-axial design consisted of a SDZ/CH mixture solution fed through a single nozzle while the coaxial design consisted of SCH and CH solutions separately supplied to the inner and outer nozzle (or in reverse order). The CH ability to form nanofibers assured the formation of a nanofiber mesh, while SDZ and SCH, both in form of suspensions in the electrospun solution, assured the formation of active nanoparticles which remained attached to the CH nanofiber mesh after the electrospinning process...
November 10, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335309/separation-of-bacteria-protozoa-and-carbon-nanotubes-by-density-gradient-centrifugation
#7
Monika Mortimer, Elijah J Petersen, Bruce A Buchholz, Patricia A Holden
Sustainable production and use of carbon nanotube (CNT)-enabled materials require efficient assessment of CNT environmental hazards, including the potential for CNT bioaccumulation and biomagnification in environmental receptors. Microbes, as abundant organisms responsible for nutrient cycling in soil and water, are important ecological receptors for studying the effects of CNTs. Quantification of CNT association with microbial cells requires efficient separation of CNT-associated cells from individually dispersed CNTs and CNT agglomerates...
October 12, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335301/facile-synthesis-of-g-c%C3%A2-n%C3%A2-nanosheets-zno-nanocomposites-with-enhanced-photocatalytic-activity-in-reduction-of-aqueous-chromium-vi-under-visible-light
#8
Xiaoya Yuan, Chao Zhou, Qiuye Jing, Qi Tang, Yuanhua Mu, An-Ke Du
Graphitic-C₃N₄ nanosheets (CN)/ZnO photocatalysts (CN/ZnO) with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C₃N₄ nanosheets. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL)...
September 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335221/mechanochemical-synthesis-of-tio%C3%A2-nanocomposites-as-photocatalysts-for-benzyl-alcohol-photo-oxidation
#9
Weiyi Ouyang, Ewelina Kuna, Alfonso Yepez, Alina M Balu, Antonio A Romero, Juan Carlos Colmenares, Rafael Luque
TiO₂ (anatase phase) has excellent photocatalytic performance and different methods have been reported to overcome its main limitation of high band gap energy. In this work, TiO₂-magnetically-separable nanocomposites (MAGSNC) photocatalysts with different TiO₂ loading were synthesized using a simple one-pot mechanochemical method. Photocatalysts were characterized by a number of techniques and their photocatalytic activity was tested in the selective oxidation of benzyl alcohol to benzaldehyde. Extension of light absorption into the visible region was achieved upon titania incorporation...
May 18, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335212/rapid-nanoparticle-synthesis-by-magnetic-and-microwave-heating
#10
Viktor Chikan, Emily J McLaurin
Traditional hot-injection (HI) syntheses of colloidal nanoparticles (NPs) allows good separation of the nucleation and growth stages of the reaction, a key limitation in obtaining monodisperse NPs, but with limited scalability. Here, two methods are presented for obtaining NPs via rapid heating: magnetic and microwave-assisted. Both of these techniques provide improved engineering control over the separation of nucleation and growth stages of nanomaterial synthesis when the reaction is initiated from room temperature...
May 5, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335208/the-influence-of-fluorination-on-nano-scale-phase-separation-and-photovoltaic-performance-of-small-molecular-pc71bm-blends
#11
Zhen Lu, Wen Liu, Jingjing Li, Tao Fang, Wanning Li, Jicheng Zhang, Feng Feng, Wenhua Li
To investigate the fluorination influence on the photovoltaic performance of small molecular based organic solar cells (OSCs), six small molecules based on 2,1,3-benzothiadiazole (BT), and diketopyrrolopyrrole (DPP) as core and fluorinated phenyl (DFP) and triphenyl amine (TPA) as different terminal units (DFP-BT-DFP, DFP-BT-TPA, TPA-BT-TPA, DFP-DPP-DFP, DFP-DPP-TPA, and TPA-DPP-TPA) were synthesized. With one or two fluorinated phenyl as the end group(s), HOMO level of BT and DPP based small molecular donors were gradually decreased, inducing high open circuit voltage for fluorinated phenyl based OSCs...
April 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335091/assessment-of-genetic-diversity-and-phylogenetic-relationships-of-korean-native-chicken-breeds-using-microsatellite-markers
#12
Joo Hee Seo, Jun-Heon Lee, Hong Sik Kong
In this study, the genetic diversity and phylogenetic relationships of 445 Korean native chickens from five different breeds(Korean Native Chicken (NC), Leghorn (LH), Cornish (CS), Rhode Island Red (RIR), and Hanhyup(HH) commercial line) were studied by performing genotyping using 20 microsatellite (MS) markers. Among the 20 MS markers selected for the genotyping, the number of alleles ranged from 5 (ADL0268) to 20 (MCW0127). The observed heterozygosity (Hobs) ranged from 0.349 (GCT0016) to 0.683 (MCW0145)...
March 21, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28335088/further-characterization-of-computed-tomographic-and-clinical-features-for-staging-and-prognosis-of-idiopathic-pulmonary-fibrosis-in-west-highland-white-terriers
#13
Florence Thierry, Ian Handel, Gawain Hammond, Lesley G King, Brendan M Corcoran, Tobias Schwarz
Idiopathic pulmonary fibrosis is an interstitial lung disease of unknown etiology resulting in progressive interstitial fibrosis, with a known predilection in West Highland white terriers. In humans, computed tomography (CT) is a standard method for providing diagnostic and prognostic information, and plays a major role in the idiopathic pulmonary fibrosis staging process. Objectives of this retrospective, analytical, cross-sectional study were to establish descriptive criteria for reporting CT findings and test correlations among CT, clinical findings and survival time in West Highland white terriers with idiopathic pulmonary fibrosis...
March 23, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28335025/a-novel-lc-ms-ms-method-with-an-effective-antioxidant-for-the-determination-of-edaravone-a-free-radical-scavenger-in-dog-plasma-and-its-application-to-a-pharmacokinetic-study
#14
Feng Shao, Xiao-Ling Hu, Xin Liu, Mang-Ting Shan
The objective of this study was to investigate the stability of edaravone in dog plasma by using an added antioxidant stabilizer, with an ultimate goal of developing and validating a sensitive, reliable and robust LC-MS-MS method for determination of edaravone in plasma samples. Edaravone was unstable in plasma, but it presented a good stability performance in the plasma with sodium metabisulfite (SMB), an effective antioxidant. The blood sample was collected in the heparinized eppendorf tube containing SMB and plasma sample was deproteinized using acetonitrile containing 20 ng/mL of phenacetin (Internal standard)...
March 2, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28335022/towards-local-implementation-of-dutch-health-policy-guidelines-a-concept-mapping-approach
#15
Theo J M Kuunders, Marja J H van Bon-Martens, Ien A M van de Goor, Theo G W M Paulussen, Hans A M van Oers
To develop a targeted implementation strategy for a municipal health policy guideline, implementation targets of two guideline users [Regional Health Services (RHSs)] and guideline developers of leading national health institutes were made explicit. Therefore, characteristics of successful implementation of the guideline were identified. Differences and similarities in perceptions of these characteristics between RHSs and developers were explored. Separate concept mapping procedures were executed in two RHSs, one with representatives from partner local health organizations and municipalities, the second with RHS members only...
February 22, 2017: Health Promotion International
https://www.readbyqxmd.com/read/28335018/dissecting-gamma-frequency-activity-during-human-memory-processing
#16
Michal T Kucewicz, Brent M Berry, Vaclav Kremen, Benjamin H Brinkmann, Michael R Sperling, Barbara C Jobst, Robert E Gross, Bradley Lega, Sameer A Sheth, Joel M Stein, Sandthitsu R Das, Richard Gorniak, S Matthew Stead, Daniel S Rizzuto, Michael J Kahana, Gregory A Worrell
Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not clear, however, which processes contribute to human brain gamma frequency activity, or their dynamics and roles during memory processing...
March 13, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334999/rewiring-the-primary-somatosensory-cortex-in-carpal-tunnel-syndrome-with-acupuncture
#17
Yumi Maeda, Hyungjun Kim, Norman Kettner, Jieun Kim, Stephen Cina, Cristina Malatesta, Jessica Gerber, Claire McManus, Rebecca Ong-Sutherland, Pia Mezzacappa, Alexandra Libby, Ishtiaq Mawla, Leslie R Morse, Ted J Kaptchuk, Joseph Audette, Vitaly Napadow
Carpal tunnel syndrome is the most common entrapment neuropathy, affecting the median nerve at the wrist. Acupuncture is a minimally-invasive and conservative therapeutic option, and while rooted in a complex practice ritual, acupuncture overlaps significantly with many conventional peripherally-focused neuromodulatory therapies. However, the neurophysiological mechanisms by which acupuncture impacts accepted subjective/psychological and objective/physiological outcomes are not well understood. Eligible patients (n = 80, 65 female, age: 49...
March 2, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334985/multicriteria-optimization-methodology-in-stability-indicating-method-development-of-cilazapril-and-hydrochlorothiazide
#18
Jasmina Šljivic, Ana Protic, Biljana Otaševic, Jelena Golubovic, Mira Zecevic, Jovana Krmar
Multicriteria optimization methodology was applied in development of UHPLC-UV-MS method for separation of cilazapril, hydrochlorothiazide and their degradation products. This method is also applicable for analysis of cilazapril, hydrochlorothiazide and their degradation products in combined tablet formulation. Prior to method optimization forced degradation studies were conducted. Cilazapril and hydrochlorothiazide were subjected to acidic (0.1, 0.5 and 1.0 M HCl), basic (0.1, 0.5 and 1.0 M NaOH), thermal (70°C), oxidative (3-30% H2O2) degradation and photodegradation (day light)...
March 17, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/28334950/downstream-targets-of-gwas-detected-genes-for-breast-lung-and-prostate-and-colon-cancer-converge-to-g1-s-transition-pathway
#19
Olga Y Gorlova, Eugene I Demidenko, Christopher I Amos, Ivan P Gorlov
Genome-wide association studies (GWASs) identified over 500 single nucleotide polymorphisms (SNPs) influencing cancer risk. It is logical to expect the cancer-associated genes to cluster in pathways directly involved in carcinogenesis, e.g. cell cycle. Nevertheless, analyses of the GWAS-detected cancer risk genes usually show no or weak enrichment by known cancer genes.We hypothesized that GWAS-detected cancer risk-associated genes function as upstream regulators of the genes directly involved in carcinogenesis...
March 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334928/functional-assessment-of-ctcf-sites-at-cytokine-sensing-mammary-enhancers-using-crispr-cas9-gene-editing-in-mice
#20
Hye Kyung Lee, Michaela Willi, Chaochen Wang, Chul Min Yang, Harold E Smith, Chengyu Liu, Lothar Hennighausen
The zinc finger protein CTCF has been invoked in establishing boundaries between genes, thereby controlling spatial and temporal enhancer activities. However, there is limited genetic evidence to support the concept that these boundaries restrict the search space of enhancers. We have addressed this question in the casein locus containing five mammary and two non-mammary genes under the control of at least seven putative enhancers. We have identified two CTCF binding sites flanking the locus and two associated with a super-enhancer...
March 16, 2017: Nucleic Acids Research
keyword
keyword
74535
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"