Jacobson complexes

C. Helling, V. Imhof, L. Nielsen, and E. Jacobson Complex Alumino-Hydrides containing Nitrogen, Phosphorus and Arsenic. Inorg. Chem. 2, 504 (1963). 

Asymmetric epoxidation is another important area of activity, initially pioneered by Sharpless, using catalysts based on titanium tetraisoprop-oxide and either (+) or (—) dialkyl tartrate. The enantiomer formed depends on the tartrate used. Whilst this process has been widely used for the synthesis of complex carbohydrates it is limited to allylic alcohols, the hydroxyl group bonding the substrate to the catalyst. Jacobson catalysts (Formula 4.3) based on manganese complexes with chiral Shiff bases have been shown to be efficient in epoxidation of a wide range of alkenes. 

Data obtained from collision-induced dissociation experiments did not allow for a distinction of the isomeric metal-silene and-silylene species however, structure-specific ion-molecule reactions of the complexes with labeled ethene were used to clearly differentiate between the metal silene and the silylene. In this intriguing study, Jacobson and coworkers also bracketed the bond dissociation energies of the isomeric ions. 

Atmospheric particles in the troposphere are composed of a complex mixture of highly water-soluble inorganic salts, insoluble mineral dust, and carbonaceous material (which includes organic compounds plus elemental carbon) (Jacobson et al., 2000). Studies in which the chemical composition has been determined as a function of particle size demonstrate a correlation between the chemical composition and the size mode of atmospheric aerosols (Meszaros et al., 1997 Krivacsy and Molnar, 1998 Alves et al.,2000 Maenhaut et al.,2002 Smolik et al., 2003 Samara andVoutsa, 2005). 

In the presence of electroosmotic flow, opposite charged dyes can be separated at particularly high separation speed on a time scale of 100 ms generating up to 18,600 theoretical plates/second, as reported by Jacobson et al. [63 ]. The same group has reported rapid separations of metal ions (Zn2+, Cd2+, Al3+) complexed with a fluorescent quinoline dye on a quartz microchip [32]. Channel walls were coated with polyacrylamide to prevent electroosmotic flow, the separation was achieved in less than 20 s at 870 V/cm and L = 16.5 mm. 

Rothman RB, Mahboubi A, Bykov V, Kim C-H, Jacobson AE, Rice KC. Probing the opioid receptor complex with (+ )-trans-SUPERFIT I Evidence that [D-Pen2,D-Pen5]enkephalin interacts with high affinity at the cx binding site. Peptides 1991 12 359-364. 

Rothman RB, Long JB, Bykov V, Jacobson AE, Rice KC, Holaday JW. Beta-FNA binds irreversibly to the opiate receptor complex in vivo and in vitro evidence. J Pharmacol Exp Ther 1988 247 405 416. 

F. H. Jardine in Chemistry of Platinum Group Metals, F. R. Hartley ed., Elsevier, New York, 1991 J. C. W. Lohrenz and H. Jacobson, Angew. Chem. Int. Ed. Engl. 1996,35, 1305 (cationic Irra complexes C—H activators). 

Predecessors (Global-through- urban) GCMOM (247 reactions, 115 species) bulk or size-resolved aqueous-phase sulfate, nitrate, organics, chlorine, oxidant, radical chemistry (64 kinetic reactions) size-resolved, prognostic aerosol/cloud with complex processes feedbacks Direct/indirect effects AQ/health effect 2002, 2004a, b), Jacobson et al. (2004, 2007), Jacobson (2006)... 

Bieganowska K, Hollsberg P, Buckle GJ, Lim DG, Greten TF, Schneck J, Altman JD, Jacobson S, Ledis SL, Hanchard B, Chin J, Morgan O, Roth PA, Hafler DA (1999) Direct analysis of viral-sjjecific CD8+ T cells with soluble HLA-A2Araxll—19 tetramer complexes in padents with human T cell lymphotropic virus-associated myelopathy. J Immunol 162 1765—1771. 

Several families of transcription factors exist. These include basal (or general) transcription factors, activators, and repressors. The basal transcription factors include transcription factor IIA (TFUA), TFIIB, TRID, TFIIE, TRIP, and TFllH. Most of these transcription factors exist as multiprotein complexes. These transcription factors must be assembled just upstream of the transcribed part of the gene before RNA polymerase begins its catalytic activity. When assembled, the entire "mega-complex" consists of about 50 proteins (Jacobson and Tjian, 1996). 

Rodgers and Jacobson have published the crystal structure of DL-(ethyl valinate-N,N-di-acetato)diaquacopper(II), the copper(II) complex of EVDA (14c). The stereochemistry around copper is distorted octahedral, the equatorial coordination sphere consisting of the tertiary... 

Other Fe complexes are known to epoxidize olefins with peracetic acid [244]. For example, Jacobson and coworkers report a Fe(mep) complex (mep=N,N -dimethyl-N,N -bis(2-pyridylmethyl)-ethane) (Fig. 1.3c) which self-assembles under reaction conditions to form a /z-oxo, carboxylate-bridged diiron complex similar to that found in the core of the hydroxylase active site of oxidized methane monooxygenase (MMO) [236]. 

Neurons are generated close to the ventricular zone of the neural tube. A complex set of factors including neuron type, position in mitotic gradients, and phylogenetic status, determines the time of neuronal origin (Jacobson, 1970). The number of neurons initially formed... 

Because of the apparent low concentration of the active component(s) in the brassins complex, it was necessary to plan for the extraction of a large quantity of rape pollen. Honeybee-collected rape pollen was available from Canada since pollen is used in specialty-type natural food products, for example baked goods. Arrangements were made (not without some difficulty) to obtain a large lot (over 1/4 ton ) of rape pollen from Canada for a pilot plant-scale extraction at ERRC. Earlier work by Mandava et al. (16) was the basis for the pilot plant extraction procedure that was developed and used (21). Contributors to the project, in addition to M. Kozempel and N. Mandava, were H. Kenney of ERRC J.F. Worley, D. Matthees, J.D. Warthen, Jr., M. Jacobson and G.L. Steffens of BARC and M.D. Grove, NRRC. 

The recent application of sparse-matrix techniques combined with computer optimization (vectorization) techniques has, however, improved the speed of Gear s code substantially, so that this advanced algorithm can now be used to study complex problems in multi-dimensional models (see e.g., the SMVGEAR package developed by Jacobson (1995 1998) and Jacobson and Turco, 1994). 

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