147,284 research outputs found
What do our school reports really say?
No full textSchool reports are an enduring feature of the education landscape. They form part of our personal history, fondly retained by parents well beyond a child’s school leaving age. The Department for Education requires schools in England to report to parents annually(Department for Education, 2015). There is widespread variation in reporting practice and many schools are doing more than is legally required of them(Power and Clark, 2000).While frequent, data focused reports are commonly used, many schools continue to write comment-based reports as part of their reporting regime. As students move into secondary school, reports of their day to day learning become less forthcoming from the students themselves and reports become one of very few channels of home-school communication
Say it in Six (or less)
No full textLightning talk introducing Ron Hoff's book, "Say it in Six: How to Say Exactly What You Mean in Six Minutes or Less" as adapted during ACRL's Immersion 2017 by A. Barhart, Cunninham, and L Hinchliffe
Molecularly imprinted cryogel for L-glutamic acid separation
No full textWOS: 000302607100019PubMed ID: 22275267A molecular recognition based L-glutamic acid (L-GLU) imprinted cryogel was prepared for L-GLU separation via chromatographic applications. The novel functional monomer N-methacryloyl-(L)-glutamic acid-Fe3+ (MAGA-Fe3+) was synthesized to be complex with L-GLU. The L-GLU imprinted cryogel was prepared by free radical polymerization under semifrozen conditions in the presence of a monomer-template complex MAGA-Fe3+-L-GLU. The binding mechanism of MAGA-Fe3+ and L-GLU was characterized by Fourier transform infrared (FTIR) spectroscopy in detail. FTIR analyses on the synthesized MAGA-Fe3+-GLU complex reveals bridging bidentate and monodentate binding modes of Fe3+ in complex with the carboxylate groups of the glutamate residues. The template L-GLU could be reversibly detached from the cryogel to form the template cavities using a 100 mM solution of HNO3. The amount of adsorbed L-GLU was detected using the phenyl isothiocyanate method. The L-GLU adsorption capacity of the cryogel decreased drastically from 11.3 to 6.4 mu mol g-1 as the flow rate increased from 0.5 to 4.0 mL min-1. The adsorption onto the L-GLU imprinted cryogel was highly pH dependent due to electrostatic interaction between the L-GLU and MAGA-Fe3+. The PHEMAGA-Fe3+-GLU cryogel exhibited high selectivity to the corresponding guest amino acids (i.e., D-GLU, L-ASN, L-GLN, L-, and D-ASP). Finally, the L-GLU imprinted cryogel was recovered and reused many times, with no significant decrease in their adsorption capacitie
L-histidine imprinted synthetic receptor for biochromatography applications
No full textWOS: 000241219800025PubMed ID: 17037929We have proposed novel surface-imprinted beads for selective separation of cytochrome c (cyt c) by N-methacryloyl(L)-histidine-copper(II) [MAH-Cu(II)] as a new metal-chelating monomer via metal coordination interactions and histidine template. We have combined molecular imprinting with the ability of histidine to chelate metal ions to create ligand exchange beads suitable for the binding of cyt c (surface histidine exposed protein). The histidine imprinted beads were produced by suspension polymerization of MAH-Cu(II)-L-histidine and ethylene glycol dimethacrylate. After polymerization, the template (L-histidine) was removed from the beads using methanolic KOH, thus getting histidine imprinted metal-chelate beads. L-Histidine imprinted metal-chelate beads can be used several times without considerable loss of cyt c adsorption capacity. The association constant (K-a) for the specific interaction between the template imprinted polymer and the template (L-histidine) itself were determined by Scatchard plots using L-histidine imprinted beads and found as 58 300 M-1. Finally, we have used these histidine imprinted beads for cyt c and ribonuclease A ( surface histidine exposed proteins) and enantiometric separation of D- and L-histidine by FPLC
La recepción de la obra de Jean-Baptiste Say en España: la teoría económica del empresario
No full textEste trabajo analiza la difusión de la teoría del empresario de Jean-Baptiste Say
en España, como último eslabón de una línea de pensamiento que tiene su origen
en Richard Cantillon. Se prueba que la particularidad de este autor es su gran difusión
en el siglo XIX español –siendo uno de los más traducidos– y la escasa
influencia de su teoría económica del empresario. Explicamos las razones de una
paradoja que deja sin fundamentos teóricos a cualquier política económica destinada
al desarrollo del tejido empresarial nacional. Son presentados los mecanismos
de difusión, tanto directos, por medio de traducciones, como indirectos, por
medio de autores españoles que pudieron difundir esta teoría de la función empresarial.
Nos interesa conocer la recepción por parte de los autores españoles de
la teoría del empresario de Say, determinar su grado de comprensión, de interpretación
en relación con la realidad nacional, de revisión teórica, e incluso conocer
si la fuente real de la idea a transmitir es el propio autor o alguna otra.This paper illustrates the spread of Jean-Baptiste Say’s entrepreneur theory in Spain –a last contribution within the French tradition in which Richard Cantillon and A. R. J. Turgot were predecessors. We attempt to demonstrate that this is a special case, because, even though J. B. Say was the most important author from a publishing point of view, his economic theory of entrepreneurship had very little influence. The spread of economic ideas by way of translation and Spanish authors which employed J. B. Say’s economic theory, give possible explanations to a
paradox which had left economic policy without a theoretical reference. We analyse how Say’s entrepreneur theory was received among Spanish authors in the 19th century, its degree of comprehension and the analytical additions made, and attempt to identify the real source of transmission
Chiral recognition of proteins having L-histidine residues on the surface with lanthanide ion complex incorporated-molecularly imprinted fluorescent nanoparticles
No full textWOS: 000320973000043PubMed ID: 23706231In this study, lanthanide ion complex incorporated molecularly imprinted fluorescent nanoparticles were synthesized. A combination of three novel approaches was applied for the purpose. First, lanthanide ions [Terbium(III)] were complexed with N-methacryloyl-L-histidine (MAH), polymerizable derivative of L-histidine amino acid, in order to incorporate the complex directly into the polymeric backbone. At the second stage, L-histidine molecules imprinted nanoparticles were utilized instead of whole protein imprinting in order to avoid whole drawbacks such as fragility, complexity, denaturation tendency, and conformation dependency. At the third stage following the first two steps mentioned above, imprinted L-histidine was coordinated with cupric ions [Cu(II)] to conduct the study under mild conditions. Then, molecularly imprinted fluorescent nanoparticles synthesized were used for L-histidine adsorption from aqueous solution to optimize conditions for adsorption and fluorimetric detection. Finally, usability of nanoparticles was investigated for chiral biorecognition using stereoisomer, D-histidine, racemic mixture, D,L-histidine, proteins with surface L-histidine residue, lysozyme, cytochrome C, or without ribonuclease A. The results revealed that the proposed polymerization strategy could make significant contribution to the solution of chronic problems of fluorescent component introduction into polymers. Additionally, the fluorescent nanoparticles reported here could be used for selective separation and fluorescent monitoring purpose
l-Histidine imprinted supermacroporous cryogels for protein recognition
No full textWOS: 000296831500004Molecular imprinting is a method for making selective binding sites in synthetic polymers using a molecular template. The aim of this study is to prepare L-histidine-imprinted poly(hydroxy ethylmethacrylate) based supermacroporous cryogels which can be used for the purification of lysozyme from egg white. A metal chelate monomer [N-methacryloyl-(L)-histidinemethylester (MAH)] forming coordination complex with the template L-histidine in the presence of Cu2+ ions copolymerized with hydroxyethyl methacrylate (HEMA), using N,N'-methylene-bis(acrylamide) (MBAAm) as the cross-linker and ammonium persulfate (APS)/N,N,N',N'-tetramethylene diamine (TEMED) as initiator/activator pair to prepare the MIP cryogel. After that, the template (i.e., L-histidine) was removed using 1 M KSCN solution. The maximum lysozyme adsorption amount was 54.2 mg/g polymer. The relative selectivity coefficients of the MIP cryogel for lysozyme/ribonuclease A and lysozyme/cytochrome c were 4.5 and 2.4 times greater than the non-imprinted poly(HEMA-MAH) (NIP) cryogel, respectively. The resulting MIP cryogels possess excellent long term storage stability and could be used many times without decreasing the adsorption amount significantl
Population dynamics of the Sycamore Lace Bug (Corythucha Ciliata, Say, Heteroptera: Tingidae) in Hungary
No full textBased on the observation of more than 10 000 leaves of plane trees, four populations of
Corythucha ciliata (Say, 1832) (Heteroptera: Tingidae) are investigated. After having introduced some
parameters derived from the data, we draw spatial-temporal patterns and describe the seasonal population
dynamics of Corythucha ciliata. Amongst others, the temporal change of the density of population, the
state plane of larvae–adults, the inclination to accumulate, and the intraspecific competition are examined.
Population and biomass dynamics is characterized for populations with and without limited nutrient
source in case of different weather circumstances and effects
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
