Automatic extraction methods typically assume that line segments are pronounced, thin, few and far between, do not cross each other, and are noise and clutter-free. Since these assumptions often fail in realistic scenarios, many line segments are not detected or are fragmented. In more severe cases, i.e., many who use the Hough Transform, extraction can fail entirely. In this paper, we propose ...

A fundamental understanding of molecular structure and dynamics requires a close coupling between theory and experiment. One ultimate objective is to utilize the understanding of molecular structure and dynamics to predict both molecular properties such as chemical reactivity and bulk properties such as phase behavior and material strengths. Often the major driving force for progress in science...

Phosphorescence in ethanol at 77 K. of the cyclophanes 1 1 4 has been investigated. It is shown that the phosphorescence characteristics are strongly determined by transannular interaction between the benzene rings. This interaction does not occur in cyclophanes 9 and 14. Phosphorescence quenching by silver Perchlorate of paracyclophanes and benzene derivatives 15-20 is due to the formation of ...

We developed a method to validate and filter a large set of previously obtained corner points. We derived the necessary relationships between image derivatives and estimates of corner angle, orientation and contrast. Commonly used cornerness measures of the autocorrelation matrix estimates of image derivatives are expressed in terms of these estimated corner properties. A candidate corner is va...

This paper presents a comprehensive theory of surface reconstruction from image derivatives in photometric stereo. For an object with an unknown, general isotropic BRDF, we show that just two measurements of the spatial and temporal image derivatives, under unknown light source positions on a circle, suffice to determine the surface. This result is the culmination of a series of fundamental obs...

A solid-phase procedure is used to synthesize racemic peptidomimetics based on the fundamental peptide unit. The peptidomimetics are constructed around proline or proline homologues variably substituted at the amine and carbonyl sites. The procedure expands the diversity of substituted peptidomimetic molecules available to the Distributed Drug Discovery (D3) project. Using a BAL-based solid-pha...

Zinc(II) complexes with dangling functional organic groups were synthesized by reaction of zinc acetate with a series of bifunctional p-substituted benzene derivatives (a combination of carboxylate, oximate, amino, β-ketoimine, and salicylaldime groups). Selective coordination to carboxylate groups was observed when the second functional group was an oxime or β-ketoimine group. When the second ...

Polymers are widely used as non-viral carriers for siRNA delivery, but concern has also arisen in their limited efficacy and inherent toxicity. Whilst many of previous efforts have been documented towards improving the performance of polymers via chemical modifications, the structure-activity relationships (SAR) of these ligand-modified polymers are not well understood. To address this issue, w...

interference with microtubule polymerization results in cell cycle arrest leading to cell death. colchicine is a well-known microtubule polymerization inhibitor which does so by binding to a specific site on tubulin. a set of 3',4'-bis (substituted phenyl)-4'h-spiro[indene-2,5'-isoxazol]-1(3h)-one derivatives with known antiproliferative activities were evaluated for their t...

in the present study, a series of new substituted oxazolone derivatives (4a-4h) were synthesized by the erlenmeyer condensation of phthaloylglycylglycine with different aldehydes in the presence of anhydrous sodium acetate and acetic anhydride. the structure of newly-synthesized compounds were evaluated by elemental analyses and spectral ( uv-visible, ir, nmr, mass) studies. all the synthesized...