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Showing 25 to 36 of 579 entries
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The discovery of crown ethers.

Science (New York, N.Y.)

Pedersen CJ.
PMID: 17774576
Science. 1988 Jul 29;241(4865):536-40. doi: 10.1126/science.241.4865.536.

The discovery of the crown ethers stemmed from efforts to control the catalytic activity of vanadium and copper by complexation with multidentate ligands. The first crown ether, 2,3,11,12-dibenzo-1,4,7,10,13,16-hexaoxacyclo-octadeca-2,11-diene, was obtained in 0.4% yield during an attempt to prepare a...

Assay of tolfenamic acid and its metabolites by liquid chromatography on dynamically modified silica: application in pharmacokinetics.

Journal of pharmaceutical and biomedical analysis

Hansen SH, Pedersen SB.
PMID: 16867632
J Pharm Biomed Anal. 1986;4(1):69-82. doi: 10.1016/0731-7085(86)80025-5.

An LC method able to separate all known metabolites of tolfenamic acid was developed. It was applied to characterize the metabolic profiles after single and multiple peroral doses of tolfenamic acid to volunteers. Up to 80% of the dose,...

Modeling fermentations with recombinant microorganisms: formulation of a structured model.

Biotechnology and bioengineering

Nielsen J, Pedersen AG, Strudsholm K, Villadsen J.
PMID: 18600679
Biotechnol Bioeng. 1991 Apr 15;37(9):802-8. doi: 10.1002/bit.260370903.

A simple structured model is described and compared with experimental data for fermentations with recombinant. Escherichia coli. The model is a so-called compartment, model, where the different biomass components are lumped together in a few intracellular variables. The model...

Effects of molecular rotation in low-energy electron collisions of H3+.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

Wolf A, Kreckel H, Lammich L, Strasser D, Mikosch J, Glosík J, Plasil R, Altevogt S, Andrianarijaona V, Buhr H, Hoffmann J, Lestinsky M, Nevo I, Novotny S, Orlov DA, Pedersen HB, Terekhov AS, Toker J, Wester R, Gerlich D, Schwalm D, Zajfman D.
PMID: 17015371
Philos Trans A Math Phys Eng Sci. 2006 Nov 15;364(1848):2981-96; discussion 2996-7. doi: 10.1098/rsta.2006.1881.

Measurements on the energetic structure of the dissociative recombination rate coefficient in the millielectronvolt range are described for H3+ ions produced in the lowest rotational levels by collisional cooling and stored as a fast beam in the magnetic storage...

Fast calculation of the quartet distance between trees of arbitrary degrees.

Algorithms for molecular biology : AMB

Christiansen C, Mailund T, Pedersen CN, Randers M, Stissing MS.
PMID: 16999860
Algorithms Mol Biol. 2006 Sep 25;1:16. doi: 10.1186/1748-7188-1-16.

BACKGROUND: A number of algorithms have been developed for calculating the quartet distance between two evolutionary trees on the same set of species. The quartet distance is the number of quartets - sub-trees induced by four leaves - that...

Single frequency, high power, tapered diode laser using phase-conjugated feedback.

Optics express

Pedersen C, Hansen R.
PMID: 19495305
Opt Express. 2005 May 30;13(11):3961-8. doi: 10.1364/opex.13.003961.

We demonstrate up to 1.6 Watts of single frequency output from a tapered diode laser operating at 785 nm. The tapered diode laser is used in a rear end external cavity set-up where the external feedback element is a...

Crossed beam photodissociation imaging of HeH+ with vacuum ultraviolet free-electron laser pulses.

Physical review letters

Pedersen HB, Altevogt S, Jordon-Thaden B, Heber O, Rappaport ML, Schwalm D, Ullrich J, Zajfman D, Treusch R, Guerassimova N, Martins M, Hoeft JT, Wellhöfer M, Wolf A.
PMID: 17677841
Phys Rev Lett. 2007 Jun 01;98(22):223202. doi: 10.1103/PhysRevLett.98.223202. Epub 2007 Jun 01.

Molecular photofragmentation has been studied by event imaging on HeH+ ions at 32 nm (38.7 eV) in a fast ion beam crossed with the free-electron laser in Hamburg (FLASH), analyzing neutral He product directions and energies. Fragmentation into He(1snl,n...

Gas phase optical rotation calculated from coupled cluster theory with zero-point vibrational corrections from density funcional theory.

Chirality

Pedersen TB, Kongsted J, Crawford TD.
PMID: 19743487
Chirality. 2009;21:E68-75. doi: 10.1002/chir.20778.

Molecular vibrations can have a significant influence on gas phase specific optical rotations. Mainly due to the large number of nuclear degrees of freedom in most chiral molecules, theoretical predictions of vibrational corrections quickly become prohibitively expensive. Here, we...

On the importance of vibrational contributions to small-angle optical rotation: Fluoro-oxirane in gas phase and solution.

The Journal of chemical physics

Pedersen TB, Kongsted J, Crawford TD, Ruud K.
PMID: 19173524
J Chem Phys. 2009 Jan 21;130(3):034310. doi: 10.1063/1.3054301.

The specific optical rotation of (S)-fluoro-oxirane in gas phase and solution is predicted using time-dependent density functional theory (B3LYP functional) and coupled cluster linear response theory. Upon vibrational averaging, the coupled cluster singles and doubles model predicts the gas...

Electrochemical properties of gas-generated silver nanoparticles in the presence of cyano- and chloride-containing compounds.

The Analyst

Marenco AJ, Pedersen DB, Wang S, Petryk MW, Kraatz HB.
PMID: 19768209
Analyst. 2009 Oct;134(10):2021-7. doi: 10.1039/b909748a. Epub 2009 Aug 14.

The electrochemistry of gas-generated naked Ag nanoparticles deposited on indium-tin oxide covered glass plates is compared to bulk polycrystalline Ag. The nano-specific electrochemistry has been identified and includes the preferential formation of beta-oxides. In 100 mM KOH supporting electrolyte,...

Oxytocin Messenger Ribonucleic Acid Levels in the Medial Preoptic Area are Increased During Lactation.

Journal of neuroendocrinology

Brooks PJ, Lund PK, Stumpf WE, Pedersen CA.
PMID: 19215397
J Neuroendocrinol. 1990 Oct 01;2(5):621-6. doi: 10.1111/j.1365-2826.1990.tb00456.x.

Abstract The peptide hormone oxytocin has an important role in parturition, lactation and maternal behavior. The present study employed in situ hybridization histochemistry to determine whether oxytocin messenger ribonucleic acid (mRNA) levels in cells in the medial preoptic area,...

[Sedentarism--a new challenge for public health?].

Ugeskrift for laeger

Tolstrup J, Petersen CB, Hansen AW.
PMID: 21375990
Ugeskr Laeger. 2011 Mar 07;173(10):731.

No abstract available.

Showing 25 to 36 of 579 entries