Now showing items 1-10 of 169
Method for the conversion of cephalomannine to taxol and for the preparation of n-acyl analogs of taxol
(United States Patent and Trademark Office, 1995-11-28)
The natural product cephalomannine can be converted to the important anticancer natural product taxol by a simple process involving the steps of dihydroxylation to give cephalomannine-diols, diol cleavage, benzoylation at ...
R Aquarii: First Detection of Circumstellar SiO Maser Proper Motions
(IOP PUBLISHING LTD, 1997-10)
We have made the first detection of circumstellar SiO maser proper motions in the envelope of a late-type star. Using the Very Long Baseline Array (VLBA), we have obtained observations at four epochs of the 43 GHz, upsilon ...
Constraints on top-color assisted technicolor models from vertex corrections
(American Physical Soc, 1999-07-01)
Metallic material with low melting temperature
(United States Patent and Trademark Office, 1996-04-16)
A gallium-indium-zinc-copper metallic material has been found to exhibit many of the advantageous properties of mercury, such as electrical conductivity, fluidity, and high vaporization temperature. The metallic material ...
On a wave equation with a boundary condition associated with capillary waves
(Siam Publications, 1998-09)
This paper discusses an initial-boundary value problem for a wave equation with a nonstandard boundary condition associated with linear capillary waves on the surface of a compressible liquid. We prove the well-posedness ...
Systematic scaling in the low-energy excitations of the t-J model in one and two dimensions
(American Physical Society, 1997-05-01)
We present an exact diagonalization study of the low-energy singlet and triplet states for both the one-dimensional (1D) and 2D t-J models. A scan of the parameter ratio J/t shows that for most low-energy states in both ...
Electron-energy-loss and optical-transmittance investigation of Bi2Sr2CaCu2O8
(American Physical Society, 1990-07)
The energy-loss function Im(-1/ε) of Bi2Sr2CaCu2O8 has been measured over the range Eloss=0.8 to 80 eV by transmission electron-energy-loss spectroscopy (EELS) (nonimaging). The energy and momentum resolution were 0.1 eV ...
Commutative rings with homomorphic power functions
A (commutative) ring R (with identity) is called m-linear (for an integer m≥2) if (a+b)m=am+bm for all a and b in R. The m-linear reduced rings are characterized, with special attention to the finite case. A structure ...
Erratum: the half-Hartley and half-Hilbert transforms (vol 35, pg 2648, 1994)
(AIP Publishing, 1994-11)
Inversion formulas are obtained for the restrictions of the Hartley and Hilbert transforms to R+. Regularity results are derived, and an illustrative example presented.
Synthesis of sphingosines
(United States Patent and Trademark Office, 1996-01-30)
Provided by the present invention is a process for the biocatalytic synthesis of optically pure sphingosines from achiral starting material. The stereoisomers of sphingosine are prepared from chiral arene diols using ...