Direct and Indirect Mechanisms of Deaggregation by Fatty Acids in Chilorophyll-Containing Systems

Brody, Michael; Nathanson, B.

doi:10.1016/s0006-3495(72)86121-6

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…This number can be used·as a measure of the turbidity of the suspensions. reported as the CD of intact spinach chloroplasts by other workers (Gregory ~ al,, 1972;Brody and Nathanson, 1972) ..…”

Section: J' ·'mentioning

confidence: 86%

Light-scattering effects on the circular dichroism of chloroplasts

Philipson¹,

Sauer²

1973

Biochemistry

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Section: J' ·'mentioning

confidence: 86%

Light-scattering effects on the circular dichroism of chloroplasts

Philipson¹,

Sauer²

1973

Biochemistry

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“…spectra of thylakoids of Anacystis compared with the cells, can be interpreted as being due to both decrease in light scattering and deaggregation of Chl a upon isolation of these thylakoids. Evi (1,7,21). This is further demonstrated by the corresponding fluorescence emission spectra monitored at 77 K (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…subchloroplast particles was seen in intact spinach chloroplasts (1,15,21): this band (positive at 683 nm) was correlated with a shift in the negative band from 679 nm in subchloroplast particles to 672 nm in the intact chloroplasts (1,21). Addition linolenic acid to a suspension of intact spinach chloroplasts (1,21) resulted in the disappearance of the 683 nm band and a shift in the negative band from 672 nm back to 679 nm.…”

mentioning

confidence: 93%

“…Addition linolenic acid to a suspension of intact spinach chloroplasts (1,21) resulted in the disappearance of the 683 nm band and a shift in the negative band from 672 nm back to 679 nm. Brody and Nathanson (1) and Nathanson (21) concluded that the 683 and 672 nm bands could be correlated with one species of Chl a and the 679 nm and 665 bands with another.…”

mentioning

confidence: 99%

“…Circular dichroism spectra were obtained using the Durrum-Jasco recording spectropolarimeter, model J-20 (Durrum Instrument Corp., Palo Alto, Calif.) as previously described (1). Fluorescence spectra were determined using the apparatus of Brody et al (3).…”

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confidence: 99%

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Partial Analysis of the Bands Seen in Circular Dichroism Spectra of Green and Blue-Green Algal Cells and Thylakoids

Nathanson¹,

White²

1977

Plant Physiol.

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A comparison was made of the circular dichroism (C.D.) spectra of Chlorella, Eugkna, and Anacystis cells and thylakoids. Analyses of the spectra reveal that these C.D. bands are similar to those observed previously in whole spinach choloroplasts and subchloroplast particles. C.D. spectra of Euglena chloroplasts show bands at longer wavelengths than previously reported. From comparisons of circular dichroism spectra and fine structure, it was concluded that: (a) bands seen in circular dichroism spectra were not ihe result of light scattering from thylakoid membranes; and (b) bands seen in the C.D. spectra of nonmembranous systems (previously reported) could account for circular dichroism of algae. We also concluded that comparisons would have to be made with model systems in order to correct for effects of absorption flattening, concentration obscuring, and differential light scattering of membranous systems.Studies have been reported using circular dichroism techniques to elucidate chloroplast structure by comparison of the C.D.' spectra of Chl a in solution and as organized into membranes (particulate Chl). Dratz et al. (10) linolenic acid to a suspension of intact spinach chloroplasts (1, 21) resulted in the disappearance of the 683 nm band and a shift in the negative band from 672 nm back to 679 nm. Brody and Nathanson (1) and Nathanson (21) concluded that the 683 and 672 nm bands could be correlated with one species of Chl a and the 679 nm and 665 bands with another.

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Excitons and Bose–Einstein condensation in living systems

Mishra¹,

Bhaumik²,

Mathur³

et al. 1979

Int J of Quantum Chemistry

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The problems connected with the transformations of energy in the living systems are reviewed. Possibility of Bose-Einstein condensation by input of radiant energy over a critical level is considered as a route for overcoming the barriers of activation energy under the conditions of a pump and a therrnalizing environment. Molecular force fields constitute the pump. Under our scheme excitons constitute the major fraction of bosons to so condense. Instantaneous dipoles of London theory are then examined as excitons. Lastly an energy packet from a quantized dipolar field is suggested rather than the concept of "conformons." Questions of charge and of other modes of energy transfer are briefly discussed.The subject of energy and charge in living systems is beset by concepts, theories, and work that often form a confusing medley. This situation is, of course, a result of the nature of data in this field, that have certainly been insufficient or irrelevant and often contradictory.Do we or our molecules work by heat, or by diverse modalities of electromagnetic irradiation that we receive, or by our position in geomagnetic field or gravitational field or by the molecular force fields? How does the nearly forbidden come to pass, that is, the making and breaking of a covalent bond? This happens regularly and with remarkable precision and specificity in a system that is essentially open. Activity involving large work are triggered off with essentially minute signals. Changes are brought about through change of a fraction of bond length, or a dihedral angle, embedded in an intraorganismic sea. Once the above is done the molecules straighten or fold or bend and twist to give sheets, tubes, balls, helices, and ropes of helices, and further balls, the building bricks of an organism with fluctuation and beat and throb of molecular conformation and association. Much of it happens in such time that makes us suspect if we are dealing with rates of entropy consumption fastest in the Universe, at the molecular level.Whatever the external field or forms of energy, in the last analysis, it is the relevant chemical reaction that one must understand. Homoiothermy or poikilothermy [l-31, Qlo [4], or other derived indices [ 5 ] , point to the chemical basis of heat production and even of physical mechanisms of heat production and

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Direct and Indirect Mechanisms of Deaggregation by Fatty Acids in Chilorophyll-Containing Systems

Cited by 9 publications

References 24 publications

Light-scattering effects on the circular dichroism of chloroplasts

Light-scattering effects on the circular dichroism of chloroplasts

Partial Analysis of the Bands Seen in Circular Dichroism Spectra of Green and Blue-Green Algal Cells and Thylakoids

Excitons and Bose–Einstein condensation in living systems

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