458 research outputs found
Laser-Grafted Molecularly Imprinted Polymers for the Detection of Histamine from Organocatalyzed Atom Transfer Radical Polymerization
No full text© 2019 American Chemical Society. To be applicable to in vivo measuring, molecularly imprinted polymer (MIP) based sensors need to have high reproducibility, require miniaturization, and must be free of toxic materials (such as heavy metals). To address these requirements, a metal-free photo atom transfer radical polymerization (ATRP) grafting procedure is described using a pulsed UV laser as light source to create thin molecularly imprinted polymer (MIP) films (∼10 nm thickness) on a sensor surface. Analysis via X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) revealed the composition of the polymer film and the necessity for an excess of functional monomer to ensure its incorporation are demonstrated. MIP films were templated toward the target molecule histamine, for which in vivo studies can reveal unknown pathological pathways of inflammatory bowel diseases. By use of impedance spectroscopy, the biosensor surface is characterized in comparison to nonimprinted film grafts, and a high selectivity and sensitivity toward the target molecule are identified, revealing a histamine concentration limit of detection of 3.4 nM.sponsorship: The authors are grateful for funding by the Research Foundation Flanders (FWO) via the project G.0B25.14N, and support from the Karlsruhe Micro Nano Facility (KMNF) is also kindly acknowledged. The authors wish to thank Mrs. Emely Bopp (IFG,KIT) for performing some TOF-SIMS experiments. Furthermore, the authors thank Prof. M. Wubbenhorst and Drs. P. Cornelis (both in KU Leuven) for making the impedance analyzer device available and for assistance in the evaluation of impedance spectroscopy data. (Research Foundation Flanders (FWO)|G.0B25.14N, Karlsruhe Micro Nano Facility (KMNF))status: Publishe
From colossal magnetoresistance to solar cells: An overview on 66 years of research into perovskites
No full text© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Perovskites are a huge family of compounds to which the natural titanium mineral CaTiO3 is the common ancestor. The cubic structure looks apparently simple, but the variety of metal ions and mixtures thereof that fit into a perovskite lattice is tremendous. Even in the case that the ionic radii do not allow for a perfect cubic ordering, there are various superstructures and orbital-ordering effects to cope elegantly with distortions. The compositional and structural flexibility offers a large toolbox to design and synthesize perovskites with tailored properties searched for by physicists, chemists, materials scientists and device engineers. These materials are equally of interest for fundamental studies and for applied research while both viewpoints cross-fertilize each other regularly. Our overview starts with the discovery of ferromagnetism in manganites in 1950 and ranges until 2016: Today, halide perovskites are fully in focus for their potential in photovoltaic applications. This is certainly not an endpoint, but another milestone in a long series of often-unexpected discoveries on an ‘evergreen material’. Ball-and-stick model of the ideal cubic perovskite structure. The cation at the central position or ‘B site’ (small black dot) defines the group name (e.g., titanates) and plays a key role for the physical properties of the material.sponsorship: The Ph.D. project of co-author Gideon Wackers is funded by FWO - Research Foundation Flanders, project no. G.0B25.14N. J. Vanacken would like to acknowledge the support from Methusalem Funding by the Flemish Government. Furthermore, the authors are grateful to Prof. Dr. Gerhard Jakob (Johannes-Gutenberg-University Mainz, Germany) for advice on the crystallographic aspects of perovskites, to Prof. Dr. Christ Glorieux (KU Leuven) for advice on pyroelectric temperature detectors, and to Prof. Dr. Margriet J. Van Bael (KU Leuven) for her input on multiferroic materials. (FWO - Research Foundation Flanders|G.0B25.14N, Flemish Government)status: Publishe
FIGURE 2 in Date and place of publication and author attribution of the combination Kalanchoe sect. Raveta (Crassulaceae subfam. Kalanchooideae)
No full textFIGURE 2. Like most of the plant parts, the flowers of Kalanchoe thyrsiflora are covered in a white-waxy substance. Flowers are densely carried in club-shaped inflorescences. Photograph: Gideon F. Smith.Published as part of Smith, Gideon F., 2022, Date and place of publication and author attribution of the combination Kalanchoe sect. Raveta (Crassulaceae subfam. Kalanchooideae), pp. 131-134 in Phytotaxa 560 (1) on page 133, DOI: 10.11646/phytotaxa.560.1.12, http://zenodo.org/record/703115
FIGURE 1 in Date and place of publication and author attribution of the combination Kalanchoe sect. Raveta (Crassulaceae subfam. Kalanchooideae)
No full textFIGURE 1. Kalanchoe thyrsiflora, the type of K. sect. Raveta, in the vegetative growing phase. The leaves are obovate to round and borne in pseudo-rosettes. Photograph: Gideon F. Smith.Published as part of Smith, Gideon F., 2022, Date and place of publication and author attribution of the combination Kalanchoe sect. Raveta (Crassulaceae subfam. Kalanchooideae), pp. 131-134 in Phytotaxa 560 (1) on page 132, DOI: 10.11646/phytotaxa.560.1.12, http://zenodo.org/record/703115
The Byzantine-Islamic transition in Palestine : an archaeological approach /
No full textUsing recent archaeological findings, Gideon Avni addresses the transformation of local societies in Palestine and Jordan between the 6th and 11th centuries AD, arguing that the Byzantine-Islamic transition was a much slower and gradual process than previously thought.Includes bibliographical references and index.Using recent archaeological findings, Gideon Avni addresses the transformation of local societies in Palestine and Jordan between the 6th and 11th centuries AD, arguing that the Byzantine-Islamic transition was a much slower and gradual process than previously thought.Description based on online resource; title from home page (viewed on March 14, 2014)
It’s not cricket!
No full text"An Author event presented by The Friends of the University of Adelaide Library, 19 April 2012, Ira Raymond Room, Barr Smith Library." Recorded at the University of Adelaide, 19 April 2012.Gideon Haig
The music of Miriam Gideon during the McCarthy era, including a complete catalogue of her works
No full textThis thesis considers the musical response of the American composer,
Miriam Gideon to political events during the McCarthy era. It examines the
interrelationships between politics, society and culture and considers how these are
reflected in two works, Epitaphs from Robert Burns (1952) and Altered Steps to
Altered States (1953) that Gideon composed during this period. Specifically, this
thesis focuses on Gideon’s transition from teaching and composing music within an
academic setting to preparing for life in a musical world, without support from
mainstream academic institutions.
Following the Introduction, Chapter 2 documents the rise of anti-communist
practices on campus at Brooklyn College and City College, New York City where
Miriam Gideon held music teaching posts. It reconstructs the personal events that led
to the loss of both of these appointments and examines how and why this occurred. It
is argued that Gideon entered a period of ‘inner exile,’ and this concept and its
consequences for Gideon are explored in Chapter 3. An examination of her private
diaries demonstrates that the effects of the McCarthy era were not only physical, but
also psychological and social.
Chapters 4-6 consider Gideon’s music through the perspective of inner exile
and aim to show that the music that she wrote was a reflection of her experiences.
Gideon’s return to academia in 1955 and her rehabilitation back into the academy are
discussed in Chapter 7. A complete list of Gideon’s compositional output is included
and is organised chronologically, alphabetically and by genre. This thesis examines
new documents not previously available to scholars, and includes interviews
conducted by the author with Gideon’s former students and colleagues
Recurrent drought in the Dr Ruth Segomotsi Mompati District Municipality of the North West Province in South Africa: an environmental justice perspective
No full textThis article adopts an environmental justice approach to recurrent drought in the North-West Province of South Africa. It is based on a secondary data analysis of a study – of which the author was a research team member – conducted in the Dr Ruth Segomotsi Mompati District Municipality in February 2007, which assessed the impact of drought on older people. The methodology used during the initial study included observation, individual interviews, focus group interviews and participatory research. The author of the present article suggests, however, that discourses of Disaster Risk Management (DRM) and ’legislative compliance’, as in many other South African contexts, have not yet been a particularly useful framing for issues of disaster and drought. The author suggests that environmental justice discourses might offer a more useful framing or conceptualisation for those concerned with the issue of recurrent drought in the study area or similar contexts
Recurrent drought in the Dr Ruth Segomotsi Mompati District Municipality of the North West Province in South Africa: An environmental justice perspective
No full textThis article adopts an environmental justice approach to recurrent drought in the North-West Province of South Africa. It is based on a secondary data analysis of a study – of which the author was a research team member – conducted in the Dr Ruth Segomotsi Mompati District Municipality in February 2007, which assessed the impact of drought on older people. The methodology used during the initial study included observation, individual interviews, focus group interviews and participatory research. The author of the present article suggests, however, that discourses of Disaster Risk Management (DRM) and ’legislative compliance’, as in many other South African contexts, have not yet been a particularly useful framing for issues of disaster and drought. The author suggests that environmental justice discourses might offer a more useful framing or conceptualisation for those concerned with the issue of recurrent drought in the study area or similar contexts
Kalanchoe marmorata var. somaliensis Gideon F. Sm.
No full textKalanchoe marmorata var. somaliensis (Baker) Gideon F.Sm. (Fig. 3) Basionym:— Kalanchoe somaliensis Baker (1895: 214). Also treated in: Hooker (1902: Tab. 7831); Berger (1930: 405); Jacobsen (1977: 289); Jacobsen (1986: 629, Fig. 887); Sajeva & Costanzo (1994: 153). Type:— Somali Land [SOMALIA]. Wardie, 22 February [presumably] 1895, received [presumably at Herb. K] in “5/95” [May 1895], [Miss] Edith Cole s.n. (lectotype K, accession number H608/68 41, barcode K000232777, https://apps.kew.org/herbcat/getImage.do?imageBarcode=K000232777) designated by Smith (2021a: 98). Homotypic synonyms:— Kalanchoe marmorata f. somaliensis (Baker) Pampanini (1909: 53). Also treated in: Pampanini (1911: 405). Kalanchoe macrantha Baker ex Maire (1976: 254) var. somaliensis (Baker) Maire (1976: 255). Nomenclatural notes on K. marmorata f. somaliensis :—Although Pampanini (1909: 53, 1911: 405), as well as, later, Jacobsen (1977: 289) and Jacobsen (1986: 629), give the author citation of the basionym of the forma he recognised as “Hook. f.”, K. somaliensis was originally described by Baker (1895: 214). The locality from where material that prompted this change in rank was collected was given as “Hab.: « Colonia Eritrea. Altipiano del Soira (Scimenzana). Località Golò, 2720–2740 m. sul mare: ripiano alluvionale derivante dal disfacimento dell’arenaria. 4 dicembre 1905 [Dainelli e Marinelli] ».—(Herb. Centr. Florent. [Centr. extra-ital.]).” [English: “Colony of Eritrea. Soira Plateau (Scimenzana). Location Golò, 2720–2740 m above sea level: alluvial shelf resulting from the decomposition of sandstone. 4 December 1905 [Danielli & Marinelli s.n.] (Herb. FI)”]. At the time this was regarded as the first and only record of K. marmorata (as K. somaliensis, here regarded as K. marmorata var. somaliensis) known from beyond the borders of Somalia, the country from which Baker (1895: 214) described K. somaliensis, from the Golis range near Wardie (Pampanini 1909: 54). Note that the specimen Danielli & Marinelli s.n. is not the type of K. marmorata f. somaliensis; it is merely a specimen that vouches for the occurrence of the forma in Eritrea. Taxonomic and nomenclatural notes on K. marmorata var. somaliensis :—When Baker (1895: 214) described K. somaliensis he gave the colour of the leaves as “brunneo-marmoratis” [brownish marbled] (see also the illustration published by Hooker 1902), as opposed to the leaves of K. marmorata that Baker (1892: 300) earlier described as “maculis copiosis fuscis marmoratis” [copiously brown marbled spotted]. Therefore, material referable to K. marmorata var. somaliensis has leaves that are virtually throughout devoid of the characteristic purplish brown mottling found on one or both surfaces of the leaves of K. marmorata var. marmorata. The leaves of the autonymic variety are usually consistently sparsely to densely spotted with purplish brown marks and in some material can be lightly spotted only (see for example the discussion in Bruce 1948: t. 1049). In his key, under “ BaαI2 ”, Berger (1930: 405 and Figure 196 D–G on p. 403) additionally recorded K. somaliensis as being characterised by: “Röhre der Blumenkrone im oberen Teile zylindrisch. Blätter grosser, seichter buchtig gezähnt, fast weiss, einiger gefleckt”. [English: “Corolla tube cylindrical higher up. Leaves large, shallowly indented, almost white, somewhat maculate”]. The contrasting statement, “ BaαI1 ”, in the key provided by Berger (1930: 405) noted: “Röhre der Blumenkrone 4kantig” for K. marmorata. However, variation in the outline of cross-sections of the corolla tubes of K. marmorata has been observed and this character is here not regarded as taxonomically useful. The leaves of K. marmorata var. somaliensis are often basally more distinctly amplexicaul and almost auriculate (see for example Jacobsen 1977: 289, 1986: 629) and not as cuneate as those of K. marmorata var. marmorata. Additionally, leaves of K. marmorata var. somaliensis are often larger than those of K. marmorata var. marmorata. Taxonomic recognition of material of K. marmorata with often larger, virtually immaculate, basally stem-clasping leaves seems desirable, as use of the name K. somaliensis, at the rank of species therefore, has persisted, for example in Jacobsen (1977: 289), Jacobsen (1986: 629, Fig. 887), and Sajeva & Costanzo (1994: 153) for material lacking the distinct purplish maculation. However, at the rank of variety a combination has only been made under K. macrantha Baker ex Maire, nom. illeg. Further, the nomenclatural novelty K. marmorata var. somaliensis is not a new combination as K. marmorata f. somaliensis has been published previously (Turland et al. 2018: Art. 6.10 and its Example 13).Published as part of Smith, Gideon F., 2022, The taxonomy of Kalanchoe marmorata Baker (Crassulaceae subfam. Kalanchooideae), a distinctive African species, revisited, pp. 100-112 in Phytotaxa 538 (2) on page 107, DOI: 10.11646/phytotaxa.538.2.2, http://zenodo.org/record/633364
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