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Sabine Koppelberg 《Order》1989,5(4):393-406
We introduce the class of minimally generated Boolean algebras, i.e. those algebras representable as the union of a continuous well-ordered chain of subalgebras A
1 where A
i+1 is a minimal extension of A
i. Minimally generated algebras are closely related to interval algebras and superatomic algebras. 相似文献
5.
The synthesis of a biotinated amphiphile assembled from d-(+)-biotin, ethylene diamine as spacer, galactaric acid and 1-dodecylamine was achieved in six steps. The key step was the synthesis of a bisacetonide protected galactaric ester, the structure of which was determined by X-ray analysis. Aminolysis, spacer attachment, coupling with biotin and deprotection led to the amphiphilic galactaramide. 相似文献
6.
Sabine Schmid 《Journal of solid state chemistry》2003,174(1):221-228
The novel alkaline earth silicate borate cyanides Ba7[SiO4][BO3]3CN and Sr7[SiO4][BO3]3CN have been obtained by the reaction of the respective alkaline earth metals M=Sr, Ba, the carbonates MIICO3, BN, and SiO2 using a radiofrequency furnace at a maximum reaction temperature of 1350°C and 1450°C, respectively. The crystal structures of the isotypic compounds MII7[SiO4][BO3]3CN have been determined by single-crystal X-ray crystallography (P63mc (no. 186), Z=2, a=1129.9(1) pm, c=733.4(2) pm, R1=0.0336, wR2=0.0743 for MII=Ba and a=1081.3(1) pm, c=695.2(1) pm, R1=0.0457, wR2=0.0838 for MII=Sr). Both ionic compounds represent a new structure type, and they are the first examples of silicate borate cyanides. The cyanide ions are disordered and they are surrounded by Ba2+/Sr2+ octahedra, respectively. These octahedra share common faces building chains along [001]. The [BO3]3− ions are arranged around these chains. The [SiO4]4− units are surrounded by Ba2+/Sr2+ tetrahedra, respectively. The title compounds additionally have been investigated by 11B, 13C, 29Si, and 1H MAS-NMR as well as IR and Raman spectroscopy confirming the presence of [SiO4]4−, [BO3]3−, and CN− ions. 相似文献
7.
Sabine Hanelt Birgit Braun Stefan Marx Hansjörg A. W. Schneider-Poetsch 《Photochemistry and photobiology》1992,56(5):751-758
We have sequenced cDNA and genomic clones coding for phytochrome of the fern Selaginella. On the amino acid level, this phytochrome shares sequence homologies with phytochromes of higher plants which range between 62 (phytochrome B of Arabidopsis) and 55 (56)% [phytochrome C of Arabidopsis (Avena)]. Introns in the Selaginella gene are short and occupy positions known from phytochrome sequences of higher plants. A rooted phylogenetic tree based on mutation distances puts Selaginella phytochrome closest to the hypothetical ancestor. A similar tree arises if the tree is constructed with partial sequences (about 200 amino acids) around the chromophore attachment site. An extension of this tree by sequences of other cryptogamic plants (Mougeotia, Ceratodon, Psilotum) shows all these sequences including those of the phytochromes B and C of Arabidopsis on a branch, well separated from the branch formed by phytochromes known to accumulate in etiolated plants. The rooted phytochrome phylogenetic tree, however, is difficult to reconcile with the fossil record. 相似文献
8.
Gerrit L'Abbé Luc Van Meervelt Sabine Emmers Wim Dehaen Suzanne Toppet 《Journal of heterocyclic chemistry》1992,29(7):1765-1768
Structural data were obtained by X-ray crystallography for the title compounds which show that they are essentially planar and exhibit an approximately linear N2-S1-N8 arrangement. In compound 3 the separation between the sulfur atom and the pyridine nitrogen atom (2.61 Å) is larger than the Huggins constant energy distance (2.58 Å), suggesting that there is little or no bonding between them. The methylated salt 4 , on the contrary, has a closer S…N(pyridine) distance (2.19 Å) with an estimated bond dissociation energy of 6 kcal/mole. 相似文献
9.
The laccase catalyzed oxidative dimerization of salicylic esters, a rare example of a laccase-catalyzed carbon-carbon bond formation, was studied. This reaction allows the use of air as stoichiometric oxidant and proceeds in aqueous solution. The preparative scope and the mechanism of the method, which provides a new and convenient access to functionalized biaryls under mild conditions, were investigated. 相似文献
10.
Siebert HC Born K André S Frank M Kaltner H von der Lieth CW Heck AJ Jiménez-Barbero J Kopitz J Gabius HJ 《Chemistry (Weinheim an der Bergstrasse, Germany)》2005,12(2):388-402
The branched pentasaccharide chain of ganglioside GM1 is a prominent cell surface ligand, for example, for cholera toxin or tumor growth-regulatory homodimeric galectins. This activity profile via protein recognition prompted us to examine the binding properties of peptides with this specificity. Our study provides insights into the mechanism of molecular interaction of this thus far unexplored size limit of the protein part. We used three pentadecapeptides in a combined approach of mass spectrometry, NMR spectroscopy and molecular modelling to analyze the ligand binding in solution. Availability of charged and hydrophobic functionalities affected the intramolecular flexibility of the peptides differently. Backfolding led to restrictions in two cases; the flexibility was not reduced significantly by association of the ligand in its energetically privileged conformations. Major contributions to the interaction energy arise from the sialic acid moiety contacting Arg/Lys residues and the N-terminal charge. Considerable involvement of stacking between the monovalent ligand and aromatic rings could not be detected. This carbohydrate binding strategy is similar to how an adenoviral fiber knob targets sialylated glycans. Rational manipulation for an affinity enhancement can now be directed to reduce the flexibility, exploit the potential for stacking and acquire the cross-linking capacity of the natural lectins by peptide attachment to a suitable scaffold. 相似文献