Download Supramolecular Structure and Function by Dušan Hadži (auth.), Dr. Greta Pifat-Mrzljak (eds.) PDF

By Dušan Hadži (auth.), Dr. Greta Pifat-Mrzljak (eds.)

During the prior decade we have now witnessed not just a rise in wisdom of the "traditional" biophysical difficulties, but in addition an realizing of the molecular foundation of varied organic phenomena. the foundations and techniques of biophysics now supply an underpin­ ning of all the simple biosciences and are the rational language for dialogue among scientists of alternative disciplines. The overseas university on Biophysics Supramolecular constitution and serve as held in Dubrovnik in September 1984 had as its aim to supply entire discussions on quite a few matters either for more youthful scientists on the doctoral or postdoctoral point attracted to the molecular nature of primary organic entities, and for knowledgeable scientists wishing to realize a broader perception into molecular buildings and services. the themes mentioned on the institution have been inter- and intramolecular interactions in organic structures, and the constitution, association, and serve as of organic macromolecules and supramolecular assemblies. a couple of issues have been headquartered round both a organic challenge or a actual approach, occasionally giving an unbalanced view of the sector below dialogue. a number of the subject matters required prior wisdom of easy biophysical rules, which have been then utilized to achieve larger perception into the molecular capabilities of numerous supramolecular platforms. even though no longer the entire lectures may be ready for booklet during this quantity, i am hoping that it comprises invaluable updated details on a variety of facets of the molecular foundation of life.

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Example text

It is interesting to note that the polymer, as seen by 31p_NMR, freeze-fracture electron microscopy and differential scanning calorimetry, interacts with the non-polymerized lipid bilayer very much like intrinsic proteins with the cell membrane phospholipids. 9. Gives rise to metastable polymerized species. Polymeric phospholipids may undergo important structural changes, some of them irreversible, when temperature is increased, Le. phospholipid polymers exhibit thermochromism. This is also important in view of some of the putative applications of this material.

Most importantly the model predicts the correct relative signs for changes due to variation in lipid chain length and head group size, respectively. D. Marsh 46 CH3-(CH2In-C()" P-(CH 2In -N H (0) n/ 120 0 () \, 100 0 LU 0:: La ::> LU n. ~ LU I- 40 / 0/ I 0 0 0"-0 80 '0::

FHC ~ 14 mN m- 1 and FHD ~ 21 mN m- 1 are the strengths of the lateral repulsive pressure from chains and head groups, respectively (cf. Israelachvili et al. 1980). 4 we obtain: 1 D=2[lf- d(l- f)). (31) Changes in l) D arising from variation l) I in lipid chain length are then given by: l) D = (f/2) [I + (1 - f) (1 + d») l) 1/1, (32) where the approximation l)FHc/FHC ~ l) 1/1 has been used. Substituting in Eq. (27) and using calorimetric and dimensional parameters appropriate to dihexadecyl phosphatidylethanolamine we get: l) Th ~ -8°C CHl l for the incremental change in transition temperature with the number ofC-atomsin the lipid chain (see Seddon et al.

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