T/O structure

The K NiF stmcture, which is also called the T or T/O structure in the superconductor literature, is built from slabs consisting of a single layer of apex-linked octahedra. The Ni ions occupy the octahedra, and the K ions are located at the centre of a square of oxygen ions formed by the vertices of the nearest octahedra and directly below the apical oxygen of the nearest octahedron in the layer above or below (Figure 4.1). The slabs can be considered to be slices of the ideal perovskite structure (KNiFj) cut parallel to the (100) planes and one octahedron in thickness, each of... 

The clay minerals of kaolinite group have dioctahedral t-o structure. This type of structure consists of three planes of anions. On one side, there is a plane of bridging 0 of the r-sheet, on the other side there is a plane of OH". The middle anionic plane consists of the non-bridging oxygens of the f-sheets and OH". In the o-sheet, each octahedral cation is surrounded by three OH" from the plane of OH", one OH" and two non-bridging oxygens from the middle plane. 

Yeates, T.O., et al. Structure of the reaction center from Rhodobacter sphaeroides R-26 membrane-protein interactions. Proc. Natl. Acad. Sci. USA 84 6438-6442, 1987. 

The Local Structure Operator By the Kolmogorov consistency theorem, we can use the Bayesian extension of Pn to define a measure on F. This measure -called the finite-block measure, /i f, where N denotes the order of the block probability function from which it is derived by Bayesian extension - is defined by assigning t.o each cylinder c Bj) = 5 G F cti = 6i, 0 2 = 62, , ( j — bj a value equal to the probability of its associated block ... 

Baldwin, T. O. (1996). Firefly luciferase the structure is known, but the mystery remains. Structure 4 223-228. 

Baldwin, T. O., etal. (1987). Structural studies of bacterial luciferases results from recombinant DNA technology. In Schoelmerich, J. (ed.), Biolumin. Chemilumin., Proc. Int. Biolumin. Chemilumin. Symp., 4th, 1986, pp. 351-360. Wiley, Chichester, UK. 

Fisher, A. J., Raushel, F. M., Baldwin, T. O., and Rayment, I. (1995). Three-dimensional structure of bacterial luciferase from Vibrio harveyi at 2.4 A resolution. Biochemistry 34 6581-6586. 

Sinclair, J. F., Waddle, J. J., Waddill, E. F., and Baldwin, T. O. (1993). Purified native subunits of bacterial luciferase are active in the bioluminescence reaction but fail to assemble into the a(3 structure. Biochemistry 32 5036-5044. 

Gaff, D.F., Zee, S.T. O Brien, T.P. (1976). The fine structure of dehydrated and reviving leaves of Borya nitida Labill. - a desiccation tolerant plant. Australian Journal of Botany, 24, 225-36. 

FIGURE 2.4 T-O-T structure of montmoriUonite clay. (From Sadhu, S. and Bhowinick, A.K., J. Polym. Set, Part B Polym. Phys., 42, 1573, 2004. Courtesy of Wiley InterScience.)... 

The foregoing examples show that the nucleophilic attack to nitroarenes at the o>T/ o-position followed by cyclization is a general method for the synthesis of various heterocycles. When nucleophiles have an electrophilic center, heterocyclic compounds are obtained in one step. Ono and coworkers have used the anion derived from ethyl isocyanoacetate as the reactive anion for the preparation of heterocyclic compounds. The carbanion reacts with various nitroarenes to give isoindoles or pyrimidines depending on the structure of nitroarenes (Eqs. 9.56 and 9.57).89 The synthesis of pyrroles is discussed in detail in Chapter 10. 

Methylsull anyT I //-tetrazole was found to crystallize in a monoclinic form, and could be sublimed into an orthorhombic form, with the structures differing in the relative polarity of the molecular layers in the two forms [47]. /) -1 o d o a ce t o p h e n one was found to crystallize in two polymorphs that both contained C—H-re points of contact, but where the contacts were shorter in one form than in the other [48]. A second monoclinic modification of the mixed salt benzimidazolium 3-carboxyphe-noxyacetate 3-carboxyphenoxyacetic acid was reported, where the acid hydrogen atom and the two monoanions comprised a carboxylate monoanion/neutral molecule in which the acid proton was disordered between the two anionic units [49]. 

Vaughey J. T., O Hara J., Thackeray M. M., Intermetallic insertion electrodes with a zinc blende-type structure for Li Batteries A study of LixInSb (0 <= x <= 3), Electrochem. and Solid State Lett., (2000) 3 (1), 13-16. 

Vaughey J.T, Johnson C. S, Kropf A. J, Benedek R, Thackeray M. M, Tostmann H., Sarakonsri T., Hackney S., Fransson L., Edstrom K., Thomas J.O., Structural and mechanistic features of intermetallic materials for lithium batteries, J. Power Sources,... 

Fedorov, A. N., and Baldwin, T. O. (1995). Contribution of co-translational folding to the rate of formation of native protein structure. Proc. Natl. Acad. Sci. USA 92, 1227—1231. 

Toluene alkylation with isopropyl alcohol was chosen as the test reaction as we can follow in a detail the effect of zeolite structural parameters on the toluene conversion, selectivity to cymenes, selectivity to para-cymene, and isopropyl/n-propyl ratio. It should be stressed that toluene/isopropyl alcohol molar ratio used in the feed was 9.6, which indicates the theoretical toluene conversion around 10.4 %. As you can see from Fig. 2 conversion of toluene over SSZ-33 after 15 min of T-O-S is 21 %, which is almost two times higher than the theoretical toluene conversion for alkylation reaction. The value of toluene conversion over SSZ-33 is influenced by a high rate of toluene disproportionation. About 50 % of toluene converted is transformed into benzene and xylenes. Toluene conversion over zeolites Beta and SSZ-35 is around 12 %, which is due to a much smaller contribution of toluene disproportionation to the overall toluene conversion. A slight increase in toluene conversion over ZSM-5 zeolite is connected with the fact that desorption and transport of products in toluene alkylation with isopropyl alcohol is the rate controlling step of this reaction [9]... 

In addition to the influence of neighbors on 29Si chemical shifts, the geometrical effects (such as Si-O-T angles) already described above are also evident of mixed frameworks with elements other than Si on tetrahedral positions. This is reflected by the broadness of the bars shown in Fig. 1. Multinuclear NMR investigations on a large set of sodalite structures with various framework compositions show that T-O-T bond angle (T = Si, Al, Ga) and dTT distance chemical shift dependences exist, and mutual correlations between chemical shift of these NMR nuclei can be observed [68],... 

Venkatasubramanian, R. Colpitts, T. O Quinn, B. Liu, S. El-Masry, N. Lamvik, M. 1999. Low-temperature organometallic epitaxy and its application to supperlat-tice structures in thermoelectrics. Appl. Phys. Lett. 75 1104-1106. 

Definition 1.3.4. Let T = (t,),>o be a sequence of non-negative integers with T = n. Let Zj- C Hilbn(J )reHilbert function T. Let Gt C Zt be the closed subscheme (with the reduced induced structure) parametrizing homogeneous ideals I C R with Hilbert function T. Let... 

Brehm, L Frydenvang, K., Hansen, L. M., Norrby, P.-O., Krogsgaard-Larsen, P, and Lilje-fors, T. (1997) Structural features of muscimol, a potent GABAa receptor agonist. Crystal structure and quantum chemical ab initio calculations. Struct. Chem. 8,443 451. 

With, K.A. and Crist, T.O. 1995. Critical thresholds in species responses to landscape structure. Ecology 76, 2446-2459. 

Suzuki, T., Fukazawa, N., Sannohe, K., Sato, W., Yano, O. and Tsuruo, T. (1997) Structure-activity relationship of newly synthesized quinoline derivatives for reversal of multidrug resistance in cancer.Journal of Medicinal Chemistry, 40, 2047-2052. 

---