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101.
Parry RJ 《Chemistry & biology》2005,12(2):145-146
The prodiginine antibiotics exhibit antitumor and immunosuppressive activity. In this issue of Chemistry & Biology, Reynolds and coworkers demonstrate that new prodiginines can be obtained by substituting a FabH ketosynthase for the RedP ketosynthase in the undecylprodiginine biosynthetic gene cluster. 相似文献
102.
Beshara CS Hall A Jenkins RL Jones TC Parry RT Thomas SP Tomkinson NC 《Chemical communications (Cambridge, England)》2005,(11):1478-1480
A mild, efficient and general method for the chemospecific alpha-oxygenation of aldehydes is described. Treatment of a series of aldehydes with N-tert-butyl-O-benzoyl hydroxylamine hydrochloride gives the corresponding alpha-oxygenated carbonyl via a proposed pericyclic rearrangement process. 相似文献
103.
Critical wetting is an elusive phenomenon for solid-fluid interfaces. Using interfacial models we show that the diverging length scales, which characterize complete wetting at an apex, precisely mimic critical wetting with the apex angle behaving as the contact angle. Transfer matrix, renormalization group, and mean-field analysis show that this covariance is obeyed in 2D and 3D and for long- and short-ranged forces. This connection should be experimentally accessible and provides a means of checking theoretical predictions for critical wetting. 相似文献
104.
Carroll CL Johnston JV Kekec A Brown JD Parry E Cajica J Medina I Cook KM Corral R Pan PS McAlpine SR 《Organic letters》2005,7(16):3481-3484
Described are the syntheses of 14 derivatives of the natural product Sansalvamide A, where two are more active against HCT 116 colon cancer cell lines than the natural product. These derivatives were synthesized using a combinatorial-type strategy that permits elucidation of the amino acid role in the cytotoxicity, and they lay the groundwork for development of new anticancer agents. [structure: see text] 相似文献
105.
106.
G.M. Swallowe R. Perrin T. Charnley D.J. Parry P.J. Webster G. Mills K. Low 《Applied Acoustics》1990,30(4)
It is speculated that warble in carillon bells can be caused by mode splitting as a result of internal strains produced by non-uniform cooling during casting. The neutron diffraction technique makes possible the measurement of internal strain and is here applied to a
in (166 mm) carillon bell with a pronounced 3 Hz warble. Internal strain variations with a 180° periodicity about the bell circumference were detected. From symmetry considerations this periodicity requires that all partials (other than m = 0) should have their doublets split. Measurements of the bell partials confirmed this splitting. The metallographic phases present in the bell metal were also determined and found to agree with expectations. 相似文献
107.
108.
109.
Fenistein D Bonn D Rafaï S Wegdam GH Meunier J Parry AO da Gama MM 《Physical review letters》2002,89(9):096101
We study the thickness of wetting layers in the binary-liquid mixture cyclohexane methanol. Far from the bulk critical point, the wetting layer thickness is independent of temperature, resulting from the competition between van der Waals and gravitational forces. Upon approaching the bulk critical temperature [t=(T(c)-T)/T(c)-->0], we observe that the wetting layer thickness diverges as t(-beta) with effective critical exponent beta=0.23+/-0.06. This is characteristic of a broad, intermediate scaling regime for the crossover from van der Waals wetting to critical scaling. We predict beta=beta/3 approximately 0.11, with beta the usual bulk-order parameter critical exponent, showing a small but significant difference with experiment. 相似文献
110.
Chlorinated organic chemicals are widely used in industry and are present in the environment. Five chlorinated aliphatic hydrocarbons, namely 1-2-dichloroethane, 1,1,2-trichloroethane, trichloroethylene, 2,3-dichlorobutane and 1-chlorohexane were investigated to determine their influence upon the fidelity of cell division in cultured mammalian cells. In order to determine the influence of these chemical compounds upon the fidelity of cell division, a technique known as differential staining of chromosomes and spindle was performed with one genetically engineered cell line and its parental cell line. The genetically engineered cell line used in this study expressed a human P450 enzyme, CYP2E1. Four chemicals, 1-2-dichloroethane, trichloroethylene, 2,3-dichlorobutane and 1-chlorohexane required metabolic bioactivations in order to induce spindle damage in cultured mammalian cells whereas 1,1,2-trichloroethane was a direct-acting spindle poison. 相似文献