Results 11 to 20 of about 2,869 (126)
Twisted 1- and 2-Azaperopyrenes: Synthesis, Structure, and Properties. [PDF]
ChemistryABSTRACT A synthesis of hitherto unknown 1‐ and 2‐azaperopyrenes, twisted nitrogen‐doped peropyrenes, is reported. The synthesis is based on a Brønsted acid‐mediated benzannulation of alkynes. Key alkyne intermediates are synthesized via two complementary routes, including a Pd/C‐catalyzed, copper‐ and amine‐free Sonogashira‐type coupling of (hetero ...
Molenda R +4 more
europepmc +2 more sources
Solvent content of protein crystals from diffraction intensities by Independent Component Analysis [PDF]
, 2003 An analysis of the protein content of several crystal forms of proteins has been performed. We apply a new numerical technique, the Independent Component Analysis (ICA), to determine the volume fraction of the asymmetric unit occupied by the protein ...
A. Lamura +34 more
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Efficient routes to epimerically-pure side-chain derivatives of lanosterol [PDF]
, 2004 A technically simple route is described to individual epimers of side-chain derivatives of lanosterol (3-hydroxy-5-lanosta-8,24-diene). Epimerically pure 24,25-epoxy-, 24,25-dihydroxy- and 24-bromo-25-hydroxy-lanosterol have been prepared in good yield ...
Kavtaradze, Levan K. +2 more
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Classification of eight dimensional perfect forms [PDF]
, 2006 In this paper, we classify the perfect lattices in dimension 8. There are 10916 of them. Our classification heavily relies on exploiting symmetry in polyhedral computations.
Schuermann, Achill +2 more
core +7 more sources
On the Fine Structure of the Projective Line Over GF(2) x GF(2) x GF(2) [PDF]
, 2006 The paper gives a succinct appraisal of the properties of the projective line defined over the direct product ring $R\_{\triangle} \equiv$ GF(2)$\otimesGF(2)\otimes$GF(2).
Planat, Michel, Saniga, Metod
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Use of massively multiple merged data for low‐resolution S‐SAD phasing and refinement of flavivirus NS1 [PDF]
, 2014 Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/109310/1/S1399004714017556 ...
Akey, David L. +4 more
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Angewandte Chemie, Volume 138, Issue 15, 6 April 2026.Titanium silicalite‐1 (TS‐1), used in industrial selective oxidation processes, depends on specific, yet still unresolved Ti sites, dispersed within the framework of an MFI‐zeolite. Applying high field (28.2 T) 47/49Ti NMR and 17O NMR spectroscopy for an array of TS‐1 catalysts enables the development of an NMR crystallography protocol and the ...
Christoph J. Kaul +14 more
wiley +2 more sources
A Local Characterization of Combinatorial Multihedrality in Tilings
, 2008 A locally finite face-to-face tiling of euclidean d-space by convex polytopes is called combinatorially multihedral if its combinatorial automorphism group has only finitely many orbits on the tiles.
Dolbilin, Nikolai, Schulte, Egon
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Is Captain Kirk a natural blonde? Do X-ray crystallographers dream of electron clouds? Comparing model-based inferences in science with fiction [PDF]
, 2018 Scientific models share one central characteristic with fiction: their relation to the physical world is ambiguous. It is often unclear whether an element in a model represents something in the world or presents an artifact of model building.
Barwich, Ann-Sophie
core
, 2020 The chalcogen elements oxygen, sulfur, and selenium are essential constituents of side chain functions of natural amino acids. Conversely, no structural and biological function has been discovered so far for the heavier and more metallic tellurium ...
Agh R +13 more
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