261 research outputs found
Den doorluchtigen hooghgeboren vorst eñ heere Wilhem Henrick, van Gods genade Prince van Orange, werden dese afbeeldingen, van weinighe schoorsteen-wercken, meest ten bevele vande doorl. hooghgeborene Zijne Hooch.ts Heeren grootvader, vader en vrouw grootmoeder /
No full textFirst plate is illustrated title. Plates [2]-[23] depict chimneypieces. All plates were drawn by Post and engraved mostly by Jan Matthysz., with two by Pieter Nolpe. Ten of the chimneypieces are from the Sael van Orange in the Huis ten Bosch.Mode of access: Internet.At upper left-hand corner of front pastedown is Theodore Besterman's calligraphic label, signed in the plate by P.S. The overmantel of the 9th plate in the Getty copy has been supplied with a sketch in black crayon.Binding: modern paper, back and corners of mottled sheepskin. Spine tooled in gilt, with author & title in gilt on label
The synthesis of the first undeca-osmium cluster species, [PPh 3Me]2[Os11C(CO)27], and the x-ray structure analysis of its [Cu(NCMe)]+ derivative [PPh 3Me][Os11C(CO)27Cu(NCMe)]·CH 2Cl2
No full textThe first undeca-osmium cluster, [Os11 C(CO)27] 2- (1), has been isolated as a low-yield product of the vacuum pyrolysis of Os3(CO)12; the dianion (1) reacts with 1 equivalent of [Cu(NCMe)4][BF4] to give the monoanion [Os11C(CO)27Cu(NCMe)]- (2) which has been shown by X-ray analysis to have an unusual Os11 core geometry with the carbido atom occupying a trigonal prismatic cavity
Optoght der Batavieren voor de vryheyt des vaderlandts, zynde een ontwerp, om [...] hondert duizent weerbare mannen in't velt te brengen [...] /
No full textNa de copye van AmsterdamVingerafdruk: 000004 - b1 A2 d'an : b2 B3 $zeVerpakt met de steun van Fonds Inbev-Latour (2010-2012)Herkomst: Vignet Isaac MeulmanVan der Wulp, J. K. Tractaten, pamfletten enz. ; 5153Europeana-GoogleBook
Synthesis of the cluster dianion [Os11C(CO)27]2- by pyrolysis and its reactions with electrophiles; X-ray structure analysis of the mixed-metal derivative [PMePh3][Os11C(CO)27Cu(NCMe)]·CH 2Cl2 and the hydrido derivative [PMePh3][Os11C(CO)27H]
No full textThe new cluster species [Os11C(CO)27]2- (2) has been identified as one of the products resulting from the pyrolysis of [Os3(CO)12]. It reacts with [Cu(NCMe)4] BF4 to yield the monoanion [Os11C(CO)27Cu(NCMe)]- (4) and [Os11C(CO)27Cu(NCMe)2] (5). The reaction of (2) with iodine-iodide produces a series of iodo-clusters [Os11C(CO)27I]- (8) and [Os11C(CO)27I2] (9) which are converted back into (2) by addition of halide ions. The unstable monoanionic species [Os11C(CO)27M(PMe2Ph)]- [M = Au (3) or Cu (7)] are obtained on reaction of (2) with [M(PMe2Ph)]+, and further reaction of (3) yields [Os11C(CO)27Au(PMe2Ph)2] (6). The dianionic cluster (2) reacts with acid to give the monoanion [Os11C(CO)27H]- (10) and [Os11C(CO)27H2] (11). The reaction with Hg(C6Cl5) (O2CCF3) yields initially the unstable monoanion [Os11C(CO)27Hg(C6Cl5)]- (12) which is rapidly converted into the known cluster dianion [Os20Hg(C)2(CO)48]2-. X-Ray analysis of the [PMePh3]+ salts of (4) and (10) reveal identical Os11 core geometries, but in (4) the copper ligand occupies a μ3-bridging position, while the hydride in (10) appears to be located in an interstitial site
Mutations in FRMD7, a newly identified member of the FERM family, cause X-linked idiopathic congenital nystagmus.
No full textIdiopathic congenital nystagmus is characterized by involuntary, periodic, predominantly horizontal oscillations of both eyes. We identified 22 mutations in FRMD7 in 26 families with X-linked idiopathic congenital nystagmus. Screening of 42 singleton cases of idiopathic congenital nystagmus (28 male, 14 females) yielded three mutations (7%). We found restricted expression of FRMD7 in human embryonic brain and developing neural retina, suggesting a specific role in the control of eye movement and gaze stability
On Writing Readable Graffiti
No full textYou just wrote it. It\u27s your most brilliant achievement yet. But is it readable? All graffitists worthy of the name must have asked themselves this question at some time. Indeed, it is a question that every conscientious author asks repeatedly. Unlike other writers, however, graffitists do not get any of the standard forms of feedback
Synthetic studies on quinquedentate macrocyclic ligands. The crystal and molecular structures of {dibenzo[b,o][1,5,13,17]pentaazacycloeicosa[4,13]diene}copper(II) diperchlorate and of {7-(2-pyridyl)-dibenzo[b,k][1,5,9,13]tetraaza-cyclopentadeca[4,9]diene(2)}copper(II)
No full text
Structure motivator: a tool for exploring small three-dimensional elements in proteins
No full text<br>Background:
Protein structures incorporate characteristic three-dimensional elements defined by some or all of hydrogen bonding, dihedral angles and amino acid sequence. The software application, Structure Motivator, allows interactive exploration and analysis of such elements, and their resolution into sub-classes.</br>
<br>Results:
Structure Motivator is a standalone application with an embedded relational database of proteins that, as a starting point, can furnish the user with a palette of unclassified small peptides or a choice of pre-classified structural motifs. Alternatively the application accepts files of data generated externally. After loading, the structural elements are displayed as two-dimensional plots of dihedral angles (φ/ψ, φ/χ1 or in combination) for each residue, with visualization options to allow the conformation or amino acid composition at one residue to be viewed in the context of that at other residues. Interactive selections may then be made and structural subsets saved to file for further sub-classification or external analysis. The application has been applied both to classical motifs, such as the β-turn, and ‘non-motif’ structural elements, such as specific segments of helices.</br>
<br>Conclusions:
Structure Motivator allows structural biologists, whether or not they possess computational skills, to subject small structural elements in proteins to rapid interactive analysis that would otherwise require complex programming or database queries. Within a broad group of structural motifs, it facilitates the identification and separation of sub-classes with distinct stereochemical properties.</br>
A survey of three combinatorial problems
No full textA dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, 2015.This dissertation is based on three di erent combinatorial papers:
1. The rst paper is by Silvia Heubach and Tou k Mansour: Enumeration of 3-Letter Patterns
in Compositions. Combinatorial Number Theory in Celebration of the 70-th Birthday of
Ronald Graham. In: De Gruyter Proceedings in Mathematics. 243-264, (2007).
2. The second paper is by Daniel J. Velleman and Gregory S. Warrington: What to expect
in a game of memory. American Mathematical Monthly, 120:787-805 (2013).
3. The third paper is by Mireille Bousquet-M elou and Richard Brak: Exactly Solved Models
of Polyominoes and Polygons. Polygons, Polyominoes and Polycubes. In: Lecture Notes in
Physics, 775:43-78, (2009).GR 201
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