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Showing 25 to 36 of 758 entries
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Pentagonal dodecahedranes: polyfunctionalization and MS fragmentation.

The Journal of organic chemistry

Landenberger P, Scheumann K, Keller M, Hunkler D, Fritz H, Wörth J, Knothe L, Prinzbach H.
PMID: 11511248
J Org Chem. 2001 Aug 24;66(17):5744-58. doi: 10.1021/jo010170+.

With the use of four- to eight-fold functionalized dodecahedranes (1-3), opportunities to arrive at highly strained dodecahedranes with two to four pairs of vicinal, eclipsed bromine substituents through front-side substitution and addition reactions have been explored. In standard processes,...

The self-regulation model.

Journal of nursing scholarship : an official publication of Sigma Theta Tau International Honor Society of Nursing

Keller ML.
PMID: 11552544
J Nurs Scholarsh. 2001;33(3):207.

No abstract available.

Nonequilibrium quasiparticles and 2e periodicity in single-Cooper-pair transistors.

Physical review letters

Aumentado J, Keller MW, Martinis JM, Devoret MH.
PMID: 14995261
Phys Rev Lett. 2004 Feb 13;92(6):066802. doi: 10.1103/PhysRevLett.92.066802. Epub 2004 Feb 13.

We have fabricated single-Cooper-pair transistors in which the spatial profile of the superconducting gap energy was controlled by oxygen doping. The profile dramatically affects the switching current vs gate voltage curve of the transistor, changing its period from 1e...

[What does increasing the tube voltage to 300 kV signify in deepray therapy?].

Strahlentherapie

WACHSMANN F, KELLER HL, DREXLER G.
PMID: 13998111
Strahlentherapie. 1962 Aug;118:619-29.

No abstract available.

Occurrence of diabetes mellitus in families of patients with cystic fibrosis of the pancreas.

Journal of chronic diseases

CHARLES RN, KELLEY ML.
PMID: 13878278
J Chronic Dis. 1961 Oct;14:381-5. doi: 10.1016/0021-9681(61)90136-9.

No abstract available.

Crystalline, mixed-valence manganese analogue of prussian blue: magnetic, spectroscopic, X-ray and neutron diffraction studies.

Journal of the American Chemical Society

Franz P, Ambrus C, Hauser A, Chernyshov D, Hostettler M, Hauser J, Keller L, Krämer K, Stoeckli-Evans H, Pattison P, Bürgi HB, Decurtins S.
PMID: 15600350
J Am Chem Soc. 2004 Dec 22;126(50):16472-7. doi: 10.1021/ja0465451.

The compound of stoichiometry Mn(II)3[Mn(III)(CN)6]2.zH2O (z = 12-16) (1) forms air-stable, transparent red crystals. Low-temperature single crystal optical spectroscopy and single crystal X-ray diffraction provide compelling evidence for N-bonded high-spin manganese(II), and C-bonded low-spin manganese(III) ions arranged in a...

Lipotropes alter casein gene expression in bovine mammary acinar culture.

The Journal of nutritional biochemistry

Wu DM, Keller WL, Park CS.
PMID: 15539323
J Nutr Biochem. 1999 Aug;10(8):455-7. doi: 10.1016/s0955-2863(99)00028-5.

Lipotropes (methyl group containing nutrients, including methionine and choline, folic acid, and vitamin B(12)) are essential for cell proliferation and differentiation of mammary tissues. Lipotropes interact in the supply and regulation of intracellular methyl group pools, thereby affecting synthesis...

Continuous generation of single photons with controlled waveform in an ion-trap cavity system.

Nature

Keller M, Lange B, Hayasaka K, Lange W, Walther H.
PMID: 15510142
Nature. 2004 Oct 28;431(7012):1075-8. doi: 10.1038/nature02961.

The controlled production of single photons is of fundamental and practical interest; they represent the lowest excited quantum states of the radiation field, and have applications in quantum cryptography and quantum information processing. Common approaches use the fluorescence of...

Comparison of Starch and ADP-Glucose Pyrophosphorylase Levels in Nonembryogenic Cells and Developing Embryos from Induced Carrot Cultures.

Plant physiology

Keller GL, Nikolau BJ, Ulrich TH, Wurtele ES.
PMID: 16665929
Plant Physiol. 1988 Feb;86(2):451-6. doi: 10.1104/pp.86.2.451.

Cultures of carrot (Daucus carota L.) in a medium without added 2,4-dichlorophenoxyacetic acid were separated into fractions of embryos at different stages of development (large globular and heart, torpedo, and germinating) and nonembryogenic cells. The average starch content per...

Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7.

Physical review letters

Dalmas de Réotier P, Yaouanc A, Keller L, Cervellino A, Roessli B, Baines C, Forget A, Vaju C, Gubbens PC, Amato A, King PJ.
PMID: 16605952
Phys Rev Lett. 2006 Mar 31;96(12):127202. doi: 10.1103/PhysRevLett.96.127202. Epub 2006 Mar 30.

We report a study of the geometrically frustrated magnetic material Tb2Sn2O7 by the positive muon-spin relaxation technique. No signature of a static magnetically ordered state is detected while neutron magnetic reflections are observed in agreement with a published report....

Bromination of unsaturated dodecahedranes--en route to C20 fullerene.

Chemistry (Weinheim an der Bergstrasse, Germany)

Sackers E, Osswald T, Weber K, Keller M, Hunkler D, Wörth J, Knothe L, Prinzbach H.
PMID: 16927320
Chemistry. 2006 Aug 16;12(24):6242-54. doi: 10.1002/chem.200501609.

As part of a study to achieve selective oligo(poly)bromination-ultimately perbromination-of the dodecahedral C(20) skeleton, the extent and direction of the ionic bromination of dodecahedrene and 1,16-dodecahedradiene were explored. Along sequences of Br(+) additions/deprotonations and allylic rearrangements, up to ten...

Reactions in water: alkyl nitrile coupling reactions using Fenton's reagent.

The Journal of organic chemistry

Keller CL, Dalessandro JD, Hotz RP, Pinhas AR.
PMID: 18363368
J Org Chem. 2008 May 02;73(9):3616-8. doi: 10.1021/jo7026905. Epub 2008 Mar 26.

The coupling reaction of water-soluble alkyl nitriles using Fenton's reagent (Fe(II) and H2O2) is described. The best metal for the reaction is iron(II), and the greatest yields are obtained when the concentration of the metal is kept low. Hydrogen-atom...

Showing 25 to 36 of 758 entries