Effects of Exchangeable Soil Sodium on Implement Draft

Schaefer, S. W.; Bischoff, Joachim; Froehlich, D.P.; DeBoer, Darrell W.

doi:10.13031/2013.31074

Cited by 5 publications

(13 citation statements)

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“…Not only do the results for both polymers coincide, the correlation times of the conformational dynamics extracted from the high spinning speed experiments also agree with those of the rotational dynamics determined from 2D exchange spectra without MAS (not shown) [22]. Excellent agreement with the results of our present study is obtained (Fig.9) assuming Tg=258 K rather than T, = 253 K as reported in [14]. Excellent agreement with the results of our present study is obtained (Fig.9) assuming Tg=258 K rather than T, = 253 K as reported in [14].…”

Section: Correlation Times Of Chain Motions In Poly(propy1ene)supporting

confidence: 89%

“…9 versus the inverse reduced temperature T,/T(in K). Also included are the results of an earlier 2H 2D exchange NMR study of a different sample [14] probing rotational chain dynamics only. Also included are the results of an earlier 2H 2D exchange NMR study of a different sample [14] probing rotational chain dynamics only.…”

Section: Correlation Times Of Chain Motions In Poly(propy1ene)mentioning

confidence: 99%

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Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR

1994

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In a variety of amorphous polymers such as poly(propylene), poly(viny1 acetate) and poly(isobutylene), various backbone conformations are detected by magic-angle-spinning (MAS) NMR in the solid state, exploiting the y-gauche effect on the isotropic chemical shifts. In poly(propylene), the populations of the conformations are related to specific configurations determined from solution ''C NMR. Above the glass transition temperature, dynamical exchange between the conformations is observed. The non-exponentiality of the correlation functions and the motional rates are similar of those of the diffuse reorientations observed by 2D exchange NMR with slow MAS or on static samples at the same temperatures. Although trans and gauche define the preferred conformations within the distribution of rotational angles for poly-(propylene), the dynamics are not suitably described by motions ofthe atoms on a diamond 1attice.This is demonstrated in particular by the absence of long term orientational memory in 3D exchange NMR experiments. To characterize the nature of the motion further, correlation functions of orders L = 2 and L = 4 have been calculated from 2D exchange spectra without MAS. A behavior intermediate between large-angle jumps and isotropic rotational diffusion is observed.

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Section: Correlation Times Of Chain Motions In Poly(propy1ene)supporting

confidence: 89%

Section: Correlation Times Of Chain Motions In Poly(propy1ene)mentioning

confidence: 99%

Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR

1994

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“…Nuclear magnetic resonance (NMR) structure evolution from the molecular precursors to the gel stage [219], [220] pore diameters or fractal dimensions [221], [222] Atomic force microscopy (AFM) atomic structure at the surface [223] strength of monolithic SiO 2 aerogels is in the range 0.15 -0.30 N/mm 2 , depending on the density, with an elastic compression of about 2 -4 %. The rigidity in vacuum is distinctly higher.…”

Section: Methodsmentioning

confidence: 99%

Aerogels

Hüsing

Schubert

2006

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Synthesis 2.1. Network Formation and Structure 2.1.1. Inorganic Aerogels 2.1.1.1. SiO 2 Aerogels 2.1.1.2. Metal Oxide Aerogels 2.1.2. Inorganic/Organic Hybrid Aerogels 2.1.3. Organic Aerogels 2.2. Drying Methods 2.2.1. Supercritical Drying 2.2.1.1. Drying in Organic Solvents 2.2.1.2. Supercritical Drying with CO 2 2.2.2. Freeze Drying 2.2.3. Ambient Pressure Drying 2.3. Modification of Aerogels after Drying 3. Properties 3.1. Structural Properties 3.2. Physical and Chemical Properties 3.2.1. Optical Properties 3.2.2. Mechanical and Acoustic Properties 3.2.3. Thermal Conductivity 3.2.4. Hydrophobicity 4. Applications 4.1. Çerenkov Detectors 4.2. Thermal Insulation 4.3. Catalysis 4.4. Application as Storage Media 4.5. Electrical and Electronic Applications 4.6. Acoustic and Mechanical Applications 4.7. Optical Applications 4.8. Other Applications 5. Future Perspectives Aerogels are unique among solid materials. They have extremely low densities (up to 95 % of their volume is air), large open pores, and a high inner surface area. This combination of properties results in interesting physical properties, e.g., for silica aerogels extremely low thermal conductivities and low sound velocities are combined with optical transparency. Aerogels are typically prepared via wet chemical processes, such as sol – gel processing, and thus their pore system is initially filled with liquid. Only special drying techniques allow for exchange of the pore liquid against air while maintaining the filigrane solid framework. The most common drying technique is supercritical extraction, and sometimes chemical modification of the inner surface can be used to facilitate drying. The structure of the gel network, and thus the physical properties of aerogels, decisively depends on the choice of the precursors and the chemical reaction parameters for preparing the gels. Therefore, the later materials properties can be deliberately designed in the starting reaction solution.

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“…T2 (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and T3 (31 -37) were sequenced directly up to their C-termini. T4 (38-72) was determined up to the 55th residue; trypsin cleaved the Met72 -Ser73 bond unusually.…”

Section: Sequence Determination Of the Tryptic Peptidesmentioning

confidence: 99%

“…T9 (91 -106) was identified up to the 96th residue [20]. Tetrahymena [21], Parumecium [22], wheat gcrm [I 21, and spinach [23] are aligncd in their four domain structures and numbered on the basis of that of human calmodulin. Substituted amino acid residues compared with human calmodulin arc shown and identical rcsidues are shown by dashes.…”

Section: Sequence Determination Of the Tryptic Peptidesmentioning

confidence: 99%

Amino acid sequence of calmodulin from Euglena gracilis

Toda

Yazawa

Yagi

1992

European Journal of Biochemistry

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The complete amino acid sequence of calmodulin from Euglena gracilis was determined by isolation and sequence analyses of peptides derived from calmodulin by digestion with trypsin and Stuphylococcus aureus V8 protease. Euglena calmodulin consists of 148 amino acid residues; it lacks tryptophan and cysteine and contains one tyrosine, three histidine and two N"-trimethyllysine residues/ molecule of the protein. Its N-terminus was blocked with an acetyl group and C-terminal lysine was trimethylated. Euglenu calmodulin is the first calmodulin so far examined in which the C-terminal lysine is trimethylated. [12], and eel, salmon, sea cucumber and fungi (unpublished).We report here the amino acid sequence of Euglena calmodulin and discuss amino acid substitutions. Materials and Methods, Figs S1 -S5 and Tables S1 and S2 appear as a Supplement at the end of this paper. RESULTS AND DISCUSSIONIsolation of tryptic peptides Tryptic peptides derived from Euglena calmodulin were separated by HPLC on a Cosmosil 5ClsP-30O column ( Note. The novcl amino acid sequencc data publishcd hcre have been deposited with the EMBL sequence data bank and are availablc Sl). Heterogeneous peptide fractions such as T7/T6-7/T12 and Tl/T2/T9/Tll were further purified by rechromatography on the same column using different solvent system as described above (Fig. S2). The 12 tryptic peptides were isolated. Amino acid compositions and overall yields of the purified tryptic peptides and whole Euglena calmodulin are listed in Table S1.Isolation of peptides generated by S. aureus V8 protease digestion S. aureus V8 protease peptides were separated in the same manner as for tryptic peptides. Heterogeneous peptide fractions were rechromatographed on a CIS column using a linear gradient of solvent B in solvent A as described in the text for separation of tryptic peptides ( Figs S3 and S4). The 15 peptides were isolated. Amino acid compositions and overall yields of the purificd peptides are listed in Table S2. N-terminal sequence analysisPeptide TI (1 -13) was resistant to Edman degradation, showing the absence of a free ainino-terminal group. TI was treated with acylamino-acid-releasing enzyme (AARE) prior to Edman degradation. Aliquots of the digest were subjected to automated Edman degradation and the remaining digests were scparated by HPLC on a CIS column (Fig. S5 and Fig. 1). The N-terminal acetylated amino acid was identified as alanine (0.8 mol/mol peptide) by amino acid analysis of fraction A1 after hydrolysis. The N-terminal acetyl group was also confirmed by FAB-MS analysis [I71 of the tryptic peptide, TI (1 -13) (data not shown). On the digestion of TI with acylamino-acid-releasing enzyme, minor cleavage of the Thr5 -His6 bond was observed due to intrinsic endopeptidase action of this enzyme. The results of sequence analysis of under accession number P11118.peptide TI are summarized in Fig. 1

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Effects of Exchangeable Soil Sodium on Implement Draft

Cited by 5 publications

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Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR

Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR

Aerogels

Amino acid sequence of calmodulin from Euglena gracilis

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Effects of Exchangeable Soil Sodium on Implement Draft

Cited by 5 publications

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Polymer conformational structure and dynamics at the glass transition studied by multidimensional 13C NMR

Polymer conformational structure and dynamics at the glass transition studied by multidimensional 13C NMR

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Amino acid sequence of calmodulin from Euglena gracilis

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Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR

Polymer conformational structure and dynamics at the glass transition studied by multidimensional ¹³C NMR