structure of descriptive essay pdf

... properties, are a direct result of the structure and bonding of the atoms and ions in the material An understanding of the origin of the differences in these properties is of great engineering importance ... amorphous structure Most engineering materials are polycrystalline, composed of many grains, and thus an understanding of the properties requires not only a knowledge of the structure of the single ... knowledge of grain size and orientation, grain boundaries, and other phases present; that is, a knowledge of the microstructure of this material 1.1.2 Atomic Structure Atoms consist of electrons,...

Ngày tải lên: 17/12/2013, 14:15

... attraction between all forms of energy, it governs the structure of matter on the largest scales of space and time, including the structure of the universe itself As one of the fundamental interactions, ... president of the National Academy of Sciences The National Academy of Engineering was established in 1964, under the charter of the National Academy of Sciences, as a parallel organization of outstanding ... the expansion of opportunities in both experiment and theory has made it one of the most rapidly changing areas of science today A short list of some of the important achievements of the past decade...

Ngày tải lên: 12/02/2014, 16:20

... conformation around the active site of ApeSOD is independent of the presence of a metal cofactor Figure 3D shows the superimposition of the active site structures of apo, Mn-bound and Fe-bound ApeSODs ... compilation ª 2010 FEBS T Nakamura et al Crystal structure of SOD from A pernix K1 A B 90° Fig Crystal structure of ApeSOD (A) Monomer structures of apo (green), Mn-bound (magenta) and Fe-bound ... (Fig 3A) Three of the ligands, OD2 of Asp165, NE2 of His79 and NE2 of His169, formed an equatorial plane The other protein ligand, NE2 of His31, bound to the metal, in the company of a water oxygen,...

Ngày tải lên: 14/02/2014, 22:20

Ngày tải lên: 15/02/2014, 17:20

... analysis of the titration of H181A PETN reductase with progesterone (C) Plot of absorbance change as a function of 2,4 dinitrophenol concentration for the data shown in (A) (D) Plot of absorbance ... directly by the binding of free steroid from solution Discussion A number of crystal structures are now available for members of the Old Yellow Enzyme family [2,3,24,33– 35] Each of these indicates ... architecture of OYE1 and PETN reductase, and (ii) geometry for the binding of steroid compounds and 2-cyclohexen-1-one [2,19] The structure of the Y186F enzyme is essentially identical to that of wild-type...

Ngày tải lên: 20/02/2014, 02:21

... 6BC, the chemical structures of which are already known [12,13] The negative ion MALDI-TOF mass spectrum of the native LPS (Fig 1) exhibited a complex pattern of several groups of ion peaks representing ... dissolved at a concentration of  20 ngÆlL)1 in 2-propanol/ water/triethylamine in a ratio of : : 0.01 (v/v/v) and sprayed at a flow rate of lLÆmin)1 MALDI-TOF MS of LPS and free lipid A were ... and of laser-induced fragment ions [18] representing the lipid A moiety of LPS (centered around m/z 1850, 1641, and 1347) The mass difference of D m/z 660 between the respective groups of ions of...

Ngày tải lên: 20/02/2014, 23:20

... three structures in a discourse structure: 1) the structure of the sequence of utterances, 2) the structure of the intentions conveyed, and 3) the attentional state Distinguishing these three structures ... about the nature of dialogue structures, about the validity and usefulness of the concept of a dialogue structure, about the role of the task structure in determining dialogue structure, and in ... validity of the notion of discourse structure derived from the task structure by: 1) describing a technique to derive the structure of dialogues and 2) validating the derived dialogue structure...

Ngày tải lên: 21/02/2014, 20:20

... R and free R values of the four structures were in the range of the values of the published structures, those of the N and G structures were slightly poor [38,39] For the N structure, the extensive ... in the TG structure and they are also structurally conserved among these glutaminases Effect of L-glutamate on the structure Figure 4A shows the effect of l-glutamate on the structure of Mglu A ... Crystal structure of salt-tolerant glutaminase A B Fig L-Glutamate in complex with Mglu and asparaginase of Erwinia carotovora LGlutamate (cylinder) on the surfaces of the structures of TG (A)...

Ngày tải lên: 06/03/2014, 09:22

... active peptide The goal of this study was determination of the 3D solution structure of preCbnB2 to assist in obtaining a molecular level understanding of the reduced activity of preCbnB2 (relative ... Fig Superimposition of preCbnB2 structures (A) Superimposition of the backbone of the leader peptide a-helix for 20 structures (B) Superimposition of the backbone of helix Both helix domains are ... help determine the structural basis of the inhibition of the antimicrobial activity of CbnB2 by the leader and to assist future analysis of the interaction of preCbnB2 with its ABC transporter...

Ngày tải lên: 07/03/2014, 15:20

... factor of 18.8% and an Rfree of 22.3% with over 90% of the residues in the most favored region of a Ramachandran plot (Table 2) The resulting model is depicted in Fig The Ca backbones of the ... domain of the other subunit, which restricts the size of the B domain (Fig 7) Active center The active center of CDase is depicted in Fig 8, which includes the superimposed structure of a TVA-II ... TVA-II group As the polypeptide superposition of Fig places the three catalytic residues of CDase (Fig 1) within less than ˚ A of the positions of those of TVA-II, and as the active centers closely...

Ngày tải lên: 08/03/2014, 02:20

... to take account of any nonlinearities in the data References “Figure Plot of groups C and D” Results from figure are also supportive of the thematic structure of each group Suras of group C are ... total number of rows in cluster G If s is interpreted in terms of the semantics of the matrix column labels, it becomes a thematic profile for G: relative to the frequency range of s, a high-frequency ... frequency profiles in a given cluster G are closer to one another than to any other profile in the data set The profiles of G can be summarized by a vector s whose dimensionality is that of the data,...

Ngày tải lên: 08/03/2014, 04:22

... (crystal structure of hTRXL-N, 2–108), 2TRX (crystal structure of E coli thioredoxin, 1–108), 1ERU and 1ERT (crystal structure of oxidized and reduced human thioredoxin, 1–105), 1DBY (NMR structure of ... consisting of b sheets shows little difference with other TRX (Fig 3B) Active site The location of the active site in all of the known thioredoxin structures is identical It includes the end of b-2, ... little direct effect on the activity of the enzyme The function of this unique C-terminal domain remains unknown Overall structure Crystals of the catalytic domain of hTRXL (hTRXL-N) were obtained...

Ngày tải lên: 08/03/2014, 22:20

... atom of Leu23 and the side chain Oc1 atom of Thr83, and one hydrophobic interaction between the side chain of Leu18 and the Cc2 atom of Thr83 FocB dimerization Fig Ribbon representation of the structure ... D Structure of FocB Fig Protein–DNA and –RNA complex structures of the top five structural homologs of FocB identified by DALI [38] Ribbon representations are shown to the left and overlays of ... residues of the protein, which were not modeled in the structure because of disorder Table summarizes the statistics of X-ray data collection and the results for the structural refinement of FocB...

Ngày tải lên: 15/03/2014, 23:20

... (fragment P16) [10] (D) Conformer I of the crystal structure dimer of E coli DnaG-C [4] (E) Conformer II of the crystal structure dimer of E coli DnaG-C [4] structure of DnaG-C as a domain-swapped ... of the solution and crystal structures of DnaG-C (A) Superposition of the backbone atoms of residues 447–581 of the 20 NMR conformers of DnaG-C representing the NMR structure (Table 1) Numbers ... of Lys447, Lys448, Ile530 and His541 (C) Domain-swapped dimer in the crystal structure of DnaG-C [4] Only residues 447–528 of conformer I and residues 527–580 of conformer II of the crystal structure...

Ngày tải lên: 16/03/2014, 12:20

... consequences of the L68Q mutation for the stability of monomeric HCC could only be inferred from the structures of 3D domainswapped dimers of HCC The present structure provides the first possibility of ... domain-swapped dimer of HCC shows unaltered inhibition of legumain, whereas it is incapable of papain binding, because of the absence of the L1 element of the recognition site [4] The backbones of molecules ... Conformation of loop L1 The present study reveals, for the first time, the structure of intact loop L1 of HCC, which structurally comprises VAG(57–59) However, when referring to loop L1 as part of the...

Ngày tải lên: 22/03/2014, 21:20

... terms of establishing hypotheses and providing proof of concept and statistical evidence for many of them Over the next few years, it will become essential to investigate more of the details of ... other, and a mixture of loop types [14] Which of these structures is preferred depends on the sequence and length of the loops – in general, shorter loops favour parallel structures [15] There ... G-quadruplex structures may be considered to be comprised of a core G-rich component, consisting of G-tetrads stacked on top of each other and zero or more connecting loops, which may be of variable...

Ngày tải lên: 23/03/2014, 03:20

... Least-squares superimposition of domain of all of the GBP structures is shown in Fig 5B, illustrating the ‘fan’ of A B related conformations observed The GGal complex is the most closed structure found to ... values of 17% and 22% (Table 1) Electron density was observed for all except residues 1–2 and 308–309 of the complete sequence in both molecules of the asymmetric unit The structure is composed of ... helices of domains and 2, respectively The EF-hand-like calcium site of domain was described earlier, and tight binding of the ion was shown to contribute to the integrity of the protein structure...

Ngày tải lên: 23/03/2014, 04:21

... 2008 FEBS 2285 Structure of spliceosomal cyclophilin PPWD1 T L Davis et al Fig Structure of PPWD1 and comparison with other Cyp structures (A) The structure of the isomerase domain of PPWD1 is shown ... Acceleration of the cis–trans isomerization of the peptide results in the collapse of these resonances into a single set of peaks (D) Binding, but not isomerization, of the N-terminal peptide of PPWD1 ... hydrophobic pocket composed of Phe540, Phe593, Met541, Leu602 and His606, all of which are conserved between CypA and PPWD1 (Figs and 3) The Nd1 atom of the Structure of spliceosomal cyclophilin...

Ngày tải lên: 23/03/2014, 07:20

... Structure and thermal stability of T maritima 2852 In order to reveal possible determinants of the increased thermotolerance of TmIDH, we compared the structure of the dimeric ... crystal structure of TmIDH, representing the first bacterial structure of an IDH from subfamily II The crystallographic structure is presented in the dimeric form as crystallization trials of the ... subunit A No of intersubunit hydrogen bonds ˚ No of intrasubunit ion pairs in subunit A at a ⁄ ⁄ A cut-off ˚ No of intrasubunit ion pairs per residue at a 4.0 A cut-off ˚ Total no of ion pairs...

Ngày tải lên: 23/03/2014, 10:21

... region of crocTTR was deleted The affinity of T3 and T4 to both TTRs was studied and the results are a powerful demonstration of the relationship between the evolution of the primary structure of ... electron density in X-ray crystal structures (Cys10 in human TTR) and considered part of the core structure of TTR In general, the character of the N-terminal region of TTRs changed from longer (14 ... Firstly, although the similarity of the phylogenetic trees based on TTR structure and those based on morphological structure of animals suggest that the structure of TTR evolved under functional...

Ngày tải lên: 23/03/2014, 10:21