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PubMed2000

HPLC on the dance floor.

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Chromatography, High Pressure Liquid↗
PubMed2006

Dancing of palladacycles around a "juggler" 2,2-diacetyl-1,1-ethylenedithiolato ligand in a trinuclear Pd(II) complex.

A trinuclear Pd complex containing a mu3-1,1-ethylenedithiolato ligand has been synthesized and its structure confirmed by X-ray crystallography. It is the first example of a 1,1-ethylenedithiolato complex containing an anionic carbon sigma donor. This compound shows an unprecedented fluxional behavior in solution, by which the three palladacycles exchange around the dithiolene. The activation parameters for this process have been derived by NMR line shape analysis, and a mechanism is proposed.

Journal Article↗
PubMed1997

Reactions of N-(Ethoxycarbonyl)-3-halo-3-(halomethyl)azetidines with DBU. The Halogen Dance.

Reaction of N-(ethoxycarbonyl)-3-(bromomethyl)-3-chloroazetidine (3) with DBU results in the formation of two haloalkenes, i.e., N-(ethoxycarbonyl)-3-(bromomethylene)azetidine and N-(ethoxycarbonyl)-3-(chloromethylene)azetidine (4a and 4b, respectively). The results of control experiments suggest that Cl(-) is capable of promoting nucleophilic displacement of bromine in the CH(2)Br groups of both 3 and N-(ethoxycarbonyl)-3-bromo-3-(bromomethyl)azetidine (8), but Br(-) is incapable of displacing chlorine in the CH(2)Cl groups of both N-(ethoxycarbonyl)-3-chloro-3-(chloromethyl)azetidine (7) and N-carbethoxy-3-bromo-3-(chloromethyl)azetidine (10). Thus, it is suggested that the formation of 4b via reaction of 3 with DBU is a result of DBU-promoted elimination of HCl from 7, a key reaction intermediate. The observations reported herein can be explained without invoking the intermediacy of any bridged halonium ion.

Journal Article↗
PubMed2005

Dancing waves in reaction-diffusion systems.

The mechanism of pattern formation in reaction-diffusion systems is treated as an interesting subject, generally for understanding self-organization observed in living systems and natural phenomena. Several spatial patterns appear in the reaction-diffusion systems where an activator and an inhibitor coexist as an intermediate, as represented by a traveling wave, a stationary wave called a Turing structure, etc. Here, we show new kinds of waves in reaction-diffusion systems, which exhibit reciprocating motion without colliding into each other or blinking periodically. These patterns have never been observed in the conventional numerical models, although experimentally oscillating spots have been often observed. Our model demonstrates that other than the ratio of diffusion coefficients for both intermediates, the thickness of reaction media acts to generate inhibitory effect. The spatial factor of the medium contributes to new pattern formation in reaction-diffusion systems. For the design of new functional materials, the concept might be useful as a simple controlling method for pattern dynamics.

Journal Article↗
PubMed2006

Construction of electrocatalytic electrodes bearing the triphenylamine nucleus covalently bound to carbon. A halogen dance in protonated aminotriphenylamines.

[reaction: see text]. The triarylamine nucleus has been attached to a carbon fiber electrode by diazotization of an aminotriphenylamine followed by electrochemical reduction. The resulting electrodes can electrocatalyze the oxidation of organic substrates. In acid, 4-amino-4',4' '-dibromotriphenylamine undergoes dismutation into a mixture of amines containing from 0 to 3 bromine atoms.

Journal Article↗
PubMed2006

CsF-promoted acetyl dance at the narrow rim of p-tert-butyl[3.1.3.1]homooxacalixarene.

In the acetylation of an oxygenated calix[4]arene homologue in the presence of CsF as a base, relaxation of the reaction system to the equilibrium composition takes place through several intra- and intermolecular steps that can be easily controlled to obtain the various acetyl derivatives. The effect of different bases is also discussed.

Journal Article↗
PubMed1998

Oppositional children and their families: an adaptational dance in space and time.

A conceptual map is proposed in which oppositional behavior is seen as an adaptational struggle within a context of interpersonal and intrapsychic spheres of family systems. Preservation of self is viewed as inherent in all childhood psychological symptomatology, and oppositionalism serves as a prime survival strategy, aimed at navigating the conflictual forces of connectedness and individuation and regulating the progression, through time, of the family life cycle.

Adaptation, Psychological↗
PubMed2001

Dancing to the tune of chemokines.

Since their discovery 13 years ago, chemokines have emerged as the most important regulators of leukocyte trafficking. On target cells, chemokines bind to seven-transmembrane-domain receptors that are coupled to heterotrimeric Gi proteins. The common response of all cells to chemokine stimulation is chemotaxis. In addition, leukocyte activation triggers diverse signal transduction cascades; which cascade is triggered depends on the chemokine and receptor engaged. The selective activation of distinct pathways suggests that the receptors couple not only to G proteins but also to additional downstream effectors. This review discusses recent advances in the elucidation of the signal transduction that occurs in proximity to receptors and that leads to the early biochemical events in leukocyte activation.

Animals↗
PubMed2006

Waltzing transporters and 'the dance macabre' between humans and bacteria.

Multidrug-resistance efflux pumps - in particular those belonging to the resistance-nodulation-cell-division (RND) family of transporters, with their unusually high degree of substrate promiscuity - significantly restrict the effectiveness of antibacterial therapy. Recent years have heralded remarkable insights into the structure and mechanisms of these fascinating molecular machines. Here, we review recent advances in the field and describe various approaches used in combating efflux-mediated resistance.

ATP Binding Cassette Transporter, Subfamily B↗
PubMed1995

Dance of the dimers.

The structure of the apo form of calcyclin, a member of the S100 family of calcium-binding proteins, reveals a novel dimer fold that may reflect the presence of a new interface for target protein recognition.

Amino Acid Sequence↗