Search results for "stereo"

Digital image analysis technique for measuring railway track defects and ballast gradation

2018

Abstract In order to guarantee safety and driving comfort and to maintain an efficient railway infrastructure, the first step is to carefully monitor the track geometry and wear level of the materials constituting the superstructure. To that end diagnostic trains are widely used on main lines, in that they can detect several geometric track parameters and rail wear, but under no circumstances they can yet detect ballast gradation. Due to the practical implications for the planning of maintenance operations on the railway network, this article presents a “DIP” digital image processing technique for measuring the transverse profile and corrugations of the rails as well as ballast gradation. T…

Dzimumu stereotipi nodarbinātības jomā Baltijas valstīs

2021

Maģistra darbā “Dzimumu stereotipi nodarbinātības jomā Baltijas valstīs” tiek analizēti pirmsākumi, procesi un mehānismi ilgtermiņa stereotipu mainīšanas politikas attīstībai mūsdienu sabiedrībā. Tiek pētīts, kā var veidot attiecības starp darba devējiem un darba ņēmējiem, lai abas puses mazāk koncentrētos uz “dzimuma efektu” savā darba vietā. Tiek noteikts, cik lielā mērā pastāvošie dzimumu stereotipi nodrošina sieviešu veiksmīgu iekļaušanos darbaspēkā; kuri stereotipi galvenokārt traucē sieviešu profesionālo zināšanu un spēju attīstībai un kā Eiropas Savienības darba likumdošana atbalsta dzimumu līdztiesību darba tirgū. Darba analītiskā daļa ietver kultūras, vēstures un sociālekonomiskos …

An Efficient Stereoselective Synthesis of Stypodiol and Epistypodiol

1998

An efficient synthesis of stypodiol (1) and its epimer at C-14, epistypodiol (2), was accomplished starting from (S)-(+)-carvone (7). The synthesis of both epimeric compounds proceeds through common intermediates using an IMDA reaction, a sonochemical Barbier reaction, and an acid-catalyzed quinol−tertiary alcohol cyclization as key synthetic steps.

Toward the development of metal-based synthetic nucleases: DNA binding and oxidative DNA cleavage of a mixed copper(II) complex with N-(9H-purin-6-yl…

2009

Abstract The complex [Cu(N9-ABS)(phen) 2 ]·3.6H 2 O, H 2 N9-ABS  = N -(9 H -purin-6-yl)benzenesulfonamide and phen = 1,10-phenanthroline, has been synthesized and then characterized with the aid of X-ray diffraction, analytical, and spectroscopic techniques. The geometry of Cu(II) is distorted square pyramidal with the equatorial positions occupied by three N atoms from two phenantroline molecules and one N atom from the adenine ring of the sulfonamide ligand. The interaction of the complex with DNA was studied by means of viscosity measurements and fluorescence spectroscopy. The results pointed to a classic intercalation of the complex between the DNA base pairs. The complex was found to b…

Docking of indolo- and pyrrolo-pyrimidines to DNA. New DNA-interactive polycycles from amino-indoles/pyrroles and BMMA

2004

New indolo- and pyrrolo-pyrimidines of type 1-4 were studied for their ability to form stable complexes with DNA fragments. The calculated free energies of binding were found in the range -8.39 ÷ -16.72 Kcal/mol. The docking studies revealed a common binding mode with the chromophore intercalated between GC base pairs whereas the side chain lies along the minor groove.

Awareness level of gender stereotype and stereotype threat effect on ingroup favoritism bias in mixed-gender basketball teams.

2016

Studies of the binding of diolepoxide metabolites of polycyclic aromatic hydrocarbons to DNA using electrofluorescence polarization spectroscopy

1996

In the electrofluorescence method, a solution of DNA with covalently bound polycyclic hydrocarbons is placed in an electric field, and changes in the intensity of polarized fluorescence are observed. Under the correct conditions, these charges can be used to determine a value for the angle psi between the long axis of the hydrocarbon molecule and the axis of the DNA helix. For DNA or poly(dA-dT) treated with each stereoisomer of anti-benzo[c]phenanthrene diolepoxide, psi ranged from 55 degrees to 61 degrees, consistent with a mixture of quasi-intercalated adenine adducts and externally bound guanine adducts. Similar results were obtained with another set of 'fjord-region' diolepoxides, deri…

Acene-type donors bearing one 1,3-dithiole ring

1999

Abstract A series of acene-type donors bearing only one 1,3-dithiole ring have been synthesized by following a Wittig-Horner reaction from 7 H -benz[ d,e ]anthracen-7-one and several phosphonate esters. The excellent donor properties have been studied using both experimental techniques and quantum-chemical calculations and reveal that the extraction of the first electron in the oxidation process occurs from the dithiole ring (0.42 e) and the acene unit (0.58 e).

Untersuchungen am Netz und �ber den Ersch�tterungssinn von Zygiella x-notata (Cl.) (Araneidae)

1956

ChemInform Abstract: Enantioselective Synthesis of Herbertane Sesquiterpenes: Synthesis of (-)-α-Formylherbertenol.

2010

Abstract The synthesis of 4-hydroxy-3-[(1 S )-1,2,2-trimethylcyclopentyl]benzaldehyde [(−)-α-formylherbertenol 1 ], a herbertane-type sesquiterpene isolated from the leafy liverwort Herberta adunca , from β-cyclogeraniol is described. The synthesis is based on the previously described preparation of an enantiopure 1,2,2-trimethylcyclopentane synthon from which the characteristic aromatic moiety of 1 is elaborated, using a Robinson annulation and a palladium-catalysed methoxycarbonylation of an aryl triflate as key synthetic steps. The synthesis of the natural sesquiterpene (−)-α-herbertenol, also a natural sequiterpene, using the same methodology is also described.