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Showing 25 to 36 of 1130 entries
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Contrasting diastereofacial selectivity associated with N-phenyltriazolinedione cycloadditions to oxaspirocycloheptatrienes.

Organic letters

Paquette LA, Webber P, Simpson I.
PMID: 12529134
Org Lett. 2003 Jan 23;5(2):177-80. doi: 10.1021/ol020223p.

[reaction: see text] The cycloaddition of N-phenyltriazolinedione to a pair of spirocyclic cycloheptatrienes featuring a tetrahydrofuran or tetrahydropyran ring is shown to proceed with opposite pi-facial stereoselectivity. In addition, the furan undergoes direct [4+2] cycloaddition to the cycloheptatriene whereas...

First-order transition from a Kondo insulator to a ferromagnetic metal in single crystalline FeSi(1-x)Ge(x).

Physical review letters

Yeo S, Nakatsuji S, Bianchi AD, Schlottmann P, Fisk Z, Balicas L, Stampe PA, Kennedy RJ.
PMID: 12906679
Phys Rev Lett. 2003 Jul 25;91(4):046401. doi: 10.1103/PhysRevLett.91.046401. Epub 2003 Jul 22.

The phase diagram of FeSi(1-x)Ge(x), obtained from magnetic, thermal, and transport measurements on single crystals, shows a discontinuous transition from Kondo insulator to ferromagnetic metal with x at a critical concentration, x(c) approximately 0.25. The gap of the insulating...

Pyroclastic activity at Home Plate in Gusev Crater, Mars.

Science (New York, N.Y.)

Squyres SW, Aharonson O, Clark BC, Cohen BA, Crumpler L, de Souza PA, Farrand WH, Gellert R, Grant J, Grotzinger JP, Haldemann AF, Johnson JR, Klingelhöfer G, Lewis KW, Li R, McCoy T, McEwen AS, McSween HY, Ming DW, Moore JM, Morris RV, Parker TJ, Rice JW, Ruff S, Schmidt M, Schröder C, Soderblom LA, Yen A.
PMID: 17478719
Science. 2007 May 04;316(5825):738-42. doi: 10.1126/science.1139045.

Home Plate is a layered plateau in Gusev crater on Mars. It is composed of clastic rocks of moderately altered alkali basalt composition, enriched in some highly volatile elements. A coarsegrained lower unit lies under a finer-grained upper unit....

Stereocontrolled synthesis of the sterically encumbered F ring of lancifodilactone G.

Organic letters

Lai KW, Paquette LA.
PMID: 18454538
Org Lett. 2008 Jun 05;10(11):2115-8. doi: 10.1021/ol800419v. Epub 2008 May 03.

A stereochemically linear strategy has been developed to prepare the heavily congested F-ring sector of lancifodilactone G (1) from commercially inexpensive (R)-carvone. Prominent operations in our synthesis include Negishi-type sp2-sp3 cross-coupling and intramolecular free-radical cyclization for the purpose of...

[Progress and problems in measuring the [Ca2+]i].

Clinical calcium

Yao A.
PMID: 15775575
Clin Calcium. 2001 Jun;11(6):726-32. doi: CliCa0106726723.

Since Ca(2+) has been recognized as an important intracellular second messenger for many signal transduction pathways, several methods to measure the intracellular Ca(2+) concentration ( [Ca(2+)](i) ) have been invented, including Ca(2+) microelectrodes, Ca(2+) sensitive dyes, and artificial Ca(2+)...

Buckytubes and derivatives: their growth and implications for buckyball formation.

Science (New York, N.Y.)

Dravid VP, Lin X, Wang Y, Wang XK, Yee A, Ketterson JB, Chang RP.
PMID: 17733027
Science. 1993 Mar 12;259(5101):1601-4. doi: 10.1126/science.259.5101.1601.

Transmission electron microscopy (TEM) observations of graphite tubules (buckytubes) and their derivatives have revealed not only the previously reported buckytube geometries but also additional shapes of the buckytube derivatives. Detailed cross-sectional TEM images reveal the cylindrical cross section of...

Nonosmotic Effects of Polyethylene Glycols upon Sodium Transport and Sodium-Potassium Selectivity by Rice Roots.

Plant physiology

Yeo AR, Flowers TJ.
PMID: 16663615
Plant Physiol. 1984 Jun;75(2):298-303. doi: 10.1104/pp.75.2.298.

Addition of polyethylene glycol (PEG) as an osmotic agent (at -230 kilopascals) dramatically lessened the toxicity of NaCl (at 50 moles per cubic meter) to rice (Oryza sativa L.) seedlings. This was explained by a reduction in the uptake...

Re: "Surgical education: in need of a shift in paradigm".

Surgery

Gordon LA.
PMID: 14760838
Surgery. 2004 Feb;135(2):240. doi: 10.1016/j.surg.2003.11.003.

No abstract available.

Abnormal expression, localization and interaction of canonical transient receptor potential ion channels in human breast cancer cell lines and tissues: a potential target for breast cancer diagnosis and therapy.

Cancer cell international

Aydar E, Yeo S, Djamgoz M, Palmer C.
PMID: 19689790
Cancer Cell Int. 2009 Aug 18;9:23. doi: 10.1186/1475-2867-9-23.

BACKGROUND: Ca2+ is known to be involved in a number of metastatic processes including motility and proliferation which can result in store-depletion of Ca2+. Up regulation of genes which contribute to store operated channel (SOC) activity may plausibly be...

Trypanosoma cruzi IIc: phylogenetic and phylogeographic insights from sequence and microsatellite analysis and potential impact on emergent Chagas disease.

PLoS neglected tropical diseases

Llewellyn MS, Lewis MD, Acosta N, Yeo M, Carrasco HJ, Segovia M, Vargas J, Torrico F, Miles MA, Gaunt MW.
PMID: 19721699
PLoS Negl Trop Dis. 2009 Sep 01;3(9):e510. doi: 10.1371/journal.pntd.0000510.

Trypanosoma cruzi, the etiological agent of Chagas disease, is highly genetically diverse. Numerous lines of evidence point to the existence of six stable genetic lineages or DTUs: TcI, TcIIa, TcIIb, TcIIc, TcIId, and TcIIe. Molecular dating suggests that T....

Speckle suppression in scanning laser displays: aberration and defocusing of the projection system.

Applied optics

Yurlov V, Lapchuk A, Yun S, Song J, Yeo I, Yang H, An S.
PMID: 19107176
Appl Opt. 2009 Jan 01;48(1):80-90. doi: 10.1364/ao.48.000080.

Aberration and defocusing effects in the mechanism of speckle suppression in laser projection displays were studied using the Fresnel approximation and the thin lens model. The analysis was performed with the assumption that aberrations change only the phase (and...

7-Bromo-4b-methyl-7,8-dihydro-4bH-9-thia-8a-aza-fluorene 9,9-dioxide.

Acta crystallographica. Section E, Structure reports online

Gallucci JC, Dura RD, Paquette LA.
PMID: 21202932
Acta Crystallogr Sect E Struct Rep Online. 2008 Jun 19;64:o1303. doi: 10.1107/S1600536808017972.

The title compound, C(12)H(12)BrNO(2)S, was isolated after direct irradiation (hν 350 nm, hexa-ne) of a mixture of stereoisomeric sulfonamides containing a vicinal dibromide and a conjugated diene. This product is one of a group of substrates that has contributed...

Showing 25 to 36 of 1130 entries