SOSA

The authors gratefully acknowledge Cray Research for providing the computer time to complete this study and thank John Carpenter and Carlos Sosa for their assistance. 

In this exercise, we will examine three alkali metal trifluorides M=K, Na and Cs (drawn from the same study by Tozer and Sosa as Example 6.6). The structure can take on one of two forms, based on the angles 0 and resulting structure is T-shaped (left drawing below) if 0 is significantly greater than distorted structure results (right) ... 

The experimental spectra are interpreted by Tozer and Sosa as follows In the Na compound, the structure is of the form NaF...F2, and it exhibits an absorption due to the complex at 455 cm, with a 460 splitting (this mode is denoted (Oj). For the other two, T-shaped compounds, the two highest frequencies resemble perturbed forms of the symmetric and asymmetric F-F-F stretching modes that we saw in the F3 anion, which we denote (O2 and (O3. The Cs compound exhibits the asymmetric F3 stretching ((O3) at 550 cm", while the K structure exhibits this vibration at 549 cm" along with a weak absorption at 467 cm". The latter may represent a weakly-active symmetric stretch ((03). 

Sclufi n Here are the results we obtained with the SVWN5, BLYP and B3LYP functionals, along with Tozer and Sosa s HP and MP2 results. All frequencies are scaled, and wt have limited our consideration to the frequencies of interest ... 

D. J. Tozerand C. P. Sosa, The alkali metal trifluorides M F3 How well can theory predict experiment , ]. Chem. Phys., submitted (1996). 

John Carpenter and Carlos Sosa of Cray Research generously provided the computer time and technical assistance for the resource use study in Chapter 6. 

Vanillin, CgHgOj, is one of the most important synthetic perfumes. It is the active odorous ingredient of the vanilla pod, in which it occurs to the extent of about 2 per cent., appearing on the surface of the bean as a fine white crystalline efflorescence. It occurs naturally also in Sumatra benzoin (about 1 per cent.), Siam benzoin (15 per cent.), and the balsams of Tolu and Peru (traces). Numerous other bodies have been recorded as containing it, such as asafoetida, beetroot and asparagus, the seeds of Lupinus albus, the seeds of Sosa canina, etc. 

Rocha-Sosa M, Sonnewald U, Frommer W, Stratman M, Schell J, Willmitzer L (1989) Both developmental and metabolic signals activate the promoter of class I patatin gene. EMBO J 8 23-29... 

Andzelm, J., Sosa, C., Eades, R. A., 1993, Theoretical Study of Chemical Reactions Using Density Functional Methods With Nonlocal Corrections , J. Phys. Chem, 97, 4664. 

Gutierrez AB, Oberti JC, Sosa VE, Herz W. Melampolides from Mikania cordifolia. Phytochemistry 1987 26 2315-2320. 

Vega Morales T, Torres PadronME, Sosa FerreraZ, Santana Rodriguez JJ (2009) Determination of alkylphenol ethoxylates and their degradation products in liquid and solid samples. TrAC,... 

Novoa, J. J., and C. Sosa. 1995. Evaluation of the Density Functional Approximation on the Computation of Hydrogen Bond Interactions. J. Phys. Chem. 99, 15837. 

A. Cabral-Prieto, I. Garcia-Sosa, J. Jimenez-Becerril, R. Lopez-Castanares and O. Olea-Cardoso, Micropor. Mesopor. Mater., 93 (2006) 199. 

Sosa-Sdnchez JL, Sosa-Sanchez A, Farfn N, Zamudio-Rivera LS, Ldpcz-Mcndoza G, Flores JP, Beltrdn HI (2005) Chem Eur J 11 4263... 

Sosa-Sanchez JL, Galindo A, Gnecco D, Bernes S, Fern GR, Silver J, Sosa-Sanchez A, Enriquez RG (2002) J Porphyrins Phthalocyanines 6 198... 

Beltran HI, Esquivel R, Sosa-Sanchez A, Sosa-Sanchez JL, Hopfl H, Barba V, Farfan N, Garcia MG, Olivares-Xometl O, Zamudio-Rivera LS (2004) Inorg Chem 43 3555... 

Several works have demonstrated that LOX from different sources is associated with several of the physiological processes that have been reviewed in this section (Porta and Rocha-Sosa, 2002). 

Several papers have reported that, during germination, new LOXs are synthesized in the seedling and the cotyledons the LOX mRNAs synthesized during germination can also be found in the mature plant. Their levels were increased by the application of abscisic acid and jasmonic acid, or by stress such as wounding, pathogen infection, or water deficit (Porta and Rocha-Sosa 2002). 

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