Molecular Dimensions of Cellulose Triesters<sup>1</sup>

Mandelkern, L.; Flory, Paul J.

doi:10.1021/ja01130a019

Cited by 84 publications

(23 citation statements)

References 1 publication

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“…The use of a constant fi is retained in the data of Table I in order to conform to common practice and so that these data can be easily compared with other data in the literature. In view of the difficulties in measuring 8, it appears that [q] is both a more sensitive and a more reliable measure of slight conformational changes in native DNA a t high ionic strength than is S2&.…”

Section: Discussionmentioning

confidence: 97%

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Rosenberg¹,

Studier²

1969

Biopolymers

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The intrinsic viscosity and sedimentation coefficient of native and single-stranded T7 DNA have been determined at 25⁰C as a function of ionic strength in neutral and alkaline NaCl. The relationship between [η] and S⁰(20,w), is well represented by the Mandelkern-Flory equation over the entire range of conditions between 0.0013 and 1M Na+. An apparent discrepancy between the two methods at moderate to high ionic strengths is probably due to a change in V with ionic strength. It appears that [η] is a more sensitive and reliable measure of molecular expansion for native DNA,but S⁰(20,w) is a better index of conformational change in single strands, since [η] becomes too small to measure conveniently at high ionic strengths. At moderate to high ionic strengths, denaturation leads to a decrease in [η], although unfolded single strands retain considerable viscosity. At sufficiently low ionic strength, the intrinsic viscosity of the single strands becomes higher than that of native DNA, and the effective volume of a single strand approaches that of the native molecule.

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Section: Discussionmentioning

confidence: 97%

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Rosenberg¹,

Studier²

1969

Biopolymers

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“…In addition, heating increases the freedom of movement of subunits in polymers, even randomly coiled ones. For example, temperature coefficients for intrinsic viscosities of cellulose and its derivatives are large with negative sign (Mandelkern and Flory 1952). The main basis for the reductions in viscosity is considered to be polymer contraction due to lowering of rotational restriction around beta 1-4 glycosidic linkages.…”

Section: Heat Effectsmentioning

confidence: 99%

Coccal cell-wall compactness and the swelling action of denaturants

Ou¹,

Marquis²

1972

Can. J. Microbiol.

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Ou, L.-T., and R. E. MARQUIS. 1972. Coccal cell-wall compactness and the swelling action of denaturants. Can. J. Microbiol. 18: 623-629. Isolated cell walls of Micrococcla lysodeiktic~rs and Stap/tylococc~ts nrirel~s were found to have relatively low densities in both the dried and hydrated states. Thus, it appears that the component polymers of these structures do not form cr)stallites or other highly condensed assemblies, but rather, that their dislribution within the wall matrix is similar to that of the polymer chains in low-density, ion-exchange resins. Micrococclts lysodeikticlu walls, which are conlposed mainly of peptidoglycan, swelled significantly when they were heated or transferred to 8 M urea solution. This finding suggests that the compactness of walls and their component peptidoglycans is determined in part by weak interactions that can be disrupted by urea o r by heat.Ou, L.-T., et R. E. MARQUIS. 1972. Coccal cell-wall compactness and the swelling action of denaturants.Can. J. Microbiol. 18: 623-629. On a observt que les parois cellulaires isoltes de &Iicrococcris lysodeikticus et Stnp/rylococcus allreus ont de faibles densitts relatives, tant a l'etat sec qu'a l'ttat hydrate. I1 semble que les polymtres qui composent ces structures ne ferment pas de cristaux ou d'autres assemblages grandement condenses, mais que leur distribution dans la matrice de la paroi est semblable a celle des chafnes de polymires a faible densitC, i.e., les rtsines tchangeuses d'ions. Les parois de M . lysodeiktic~ts, lesquelles se composent principalement de peptidoglycans, renflent considtrable~nent lorsqu'elles sont chaufftes ou qu'elles sont transfertes dans une solution d'urte 8 M . Cette observation suggire que la cornpaticite des parois et de leur peptidoglycans est determinte en partie par des interactions faibles, ces derniires peuvent &tre rtduites par l'uree ou par la chaleur.

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“…According to the theory of Kurata-FukatsuSotobayashi-Yamakawa, 32 zh 0 (z) in eq 6 is a function of z, given by ih 0 (i) =(1/5.047){1-(1 +0.683£)-7 · 39 } (8) In the vicinity of z 0, the following relation holds between z and a. 33 (9) Combining eq 6-9 enables us to estimate a., when a. is not far from unity, using the light scattering data. The tenth column of is valid only when the unperturbed chain is Gaussian and is only approximately valid when the unperturbed chain is not Gaussian, but the extent of departure from the Gaussian nature is not remarkable.…”

Section: Light Scatteringmentioning

confidence: 99%

Temperature Dependence of Limiting Viscosity Number and Radius of Gyration for Cellulose Dissolved in Aqueous 8% Sodium Hydroxide Solution

Kamide¹,

Saito²,

Kowsaka³

1987

Polym J

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Molecular Dimensions of Cellulose Triesters¹

Cited by 84 publications

References 1 publication

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Coccal cell-wall compactness and the swelling action of denaturants

Temperature Dependence of Limiting Viscosity Number and Radius of Gyration for Cellulose Dissolved in Aqueous 8% Sodium Hydroxide Solution

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Molecular Dimensions of Cellulose Triesters1

Cited by 84 publications

References 1 publication

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Intrinsic viscosity of native and single‐stranded T7 DNA and its relationship to sedimentation coefficient

Coccal cell-wall compactness and the swelling action of denaturants

Temperature Dependence of Limiting Viscosity Number and Radius of Gyration for Cellulose Dissolved in Aqueous 8% Sodium Hydroxide Solution

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Molecular Dimensions of Cellulose Triesters¹