Перегляд вихідного коду сторінки Newbie All-inclusive Map For the Fulvestrant

The experimental Raman cross sections and those determined from a 24-mode Raman intensity calculation for Pr are presented in Table 1. The experimental cross sections of Pfr were modeled using a 31-mode vibronic analysis and these results are given in Table 2. Relative ��-values were estimated assuming Ii �� ��i2 ?i2 and the magnitude was adjusted to fit the overall width of the [http://www.selleckchem.com/products/Fulvestrant.html Fulvestrant] absorption spectrum. The homogeneous and inhomogeneous broadening parameters were adjusted to optimize the fit to the absorption band as described above. Efforts to model the data using a Lorentzian lineshape function whose width was large enough to produce the correct Raman cross sections were unsuccessful because it predicted a large red-edge tail in the absorption spectrum that is inconsistent with experimental results. As a result, we used a Gaussian homogeneous lineshape function in the calculations. In addition, attempts to use larger relative values for the displacements resulted in absorption spectra that were too broad, and this breadth could not be reduced by any combination of homogeneous and inhomogeneous broadening parameters. The most prominent modes in both the Pr and Pfr spectra are the HOOP, C�CH rock, and C=C stretch. In the case of?Pr,?the experimental cross sections of the [http://www.selleckchem.com/products/ABT-888.html Veliparib] C15�CH HOOP?and C15=C16 stretch are 14.4?�� 10?11 and 37.5?��?10?11??2 molecule?1, and in Pfr they are 118?�� 10?11 and 75.8?�� 10?11 ?2 molecule?1, respectively. Whereas the cross section of the Pfr C15=C16 stretch is larger than that of Pr by a factor of ?2, the Pfr C15�CH HOOP is ?8.5 times larger than that of Pr. It is interesting to note that, with the exception of the Pfr C15�CH HOOP, [http://en.wikipedia.org/wiki/RRAD RRAD] the ��-values of each of these modes is ?0.4. For the Pfr C15�CH HOOP, however, �� was determined to be 0.64. A highly displaced HOOP wag is consistent with a nonplanar conformation of the C- and D-rings in the Pfr state (30). Additional evidence of a distorted structure in this region is the decrease in double-bond character indicated by the large downshift in the C15=C16 stretch frequency from 1630?cm?1 in Pr to 1607?cm?1 in Pfr. The primary purpose of this study is to determine the structure and excited-state dynamics of the bilin chromophore during the photocycle of phytochrome Cph1. A clear picture of the ground-state structure is necessary for understanding the reaction pathway, while the early-time dynamics give insight into the mechanism by which the protein mediates photoisomerization. A particular point of interest is the difference in isomerization dynamics between the forward and back reactions: whereas the Pr �� Pfr isomerization occurs in ?3?ps (4, 6?and?32), the Pfr �� Pr isomerization proceeds in