C. L. R. James on the Caribbean

James, C. L. R.

doi:10.1215/9780822382386-003

Cited by 38 publications

(59 citation statements)

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“…Even so, it remains possible that cell size does influence body size in smaller taxa such as nematodes and insects. Recent studies have shown that cell size accounts for much body size evolution among populations and species of Drosophila (9,10).…”

mentioning

confidence: 99%

Somatic polyploidization and cellular proliferation drive body size evolution in nematodes

Flemming

Shen

Cunha

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

142

189

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Most of the hypodermis of a rhabditid nematode such as Caenorhabditis elegans is a single syncytium. The size of this syncytium (as measured by body size) has evolved repeatedly in the rhabditid nematodes. Two cellular mechanisms are important in the evolution of body size: changes in the numbers of cells that fuse with the syncytium, and the extent of its acellular growth. Thus nematodes differ from mammals and other invertebrates in which body size evolution is caused by changes in cell number alone. The evolution of acellular syncytial growth in nematodes is also associated with changes in the ploidy of hypodermal nuclei. These nuclei are polyploid as a consequence of iterative rounds of endoreduplication, and this endocycle has evolved repeatedly. The association between acellular growth and endoreduplication is also seen in C. elegans mutations that interrupt transforming growth factor-␤ signaling and that result in dwarfism and deficiencies in hypodermal ploidy. The transforming growth factor-␤ pathway is a candidate for being involved in nematode body size evolution.

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mentioning

confidence: 99%

Somatic polyploidization and cellular proliferation drive body size evolution in nematodes

Flemming

Shen

Cunha

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

142

189

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“…The quantum network [32] described in Eq. (1) has been used to study the EET in photosynthetic complexes in much literature [8][9][10][11][12][13][14][15][16][17].…”

Section: Quantum Network Model With the Phasesmentioning

confidence: 99%

“…The quantum phases are determined by the spatial structure of the pigments in photosynthetic complexes, such as the length of the pigment, the barriers and the distance between pigments. The quantum network in the absence of the phase factors has been used to study the EET in the photosynthetic complexes [8][9][10][11][12][13][14][15][16][17][18]. Some interesting results, such as noises may enhance the EET, and the EET in a quantum model may be larger than that of a classical model, are obtained.…”

Section: Introductionmentioning

confidence: 99%

Complex quantum network model of energy transfer in photosynthetic complexes

Zhu

2012

Phys. Rev. E

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The quantum network model with real variables is usually used to describe the excitation energy transfer (EET) in the Fenna-Matthews-Olson(FMO) complexes. In this paper we add the quantum phase factors to the hopping terms and find that the quantum phase factors play an important role in the EET. The quantum phase factors allow us to consider the space structure of the pigments. It is found that phase coherence within the complexes would allow quantum interference to affect the dynamics of the EET. There exist some optimal phase regions where the transfer efficiency takes its maxima, which indicates that when the pigments are optimally spaced, the exciton can pass through the FMO with perfect efficiency. Moreover, the optimal phase regions almost do not change with the environments. In addition, we find that the phase factors are useful in the EET just in the case of multiple-pathway. Therefore, we demonstrate that, the quantum phases may bring the other two factors, the optimal space of the pigments and multiple-pathway, together to contribute the EET in photosynthetic complexes with perfect efficiency.

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“…Both scenarios are known to form polar structures (see Reshetnikov & Sotnikova 1997;Bekki 1997Bekki , 1998. The numerical code computes the gravitational potential via an FFT method (James 1977), and includes sticky particles gas dynamics (Schwarz 1981), and star formation that is assumed to obey a generalised Schmidt law (Schmidt 1959). Both scenarios for formation of polar rings give similar results for the kinematics of the ring after its formation.…”

Section: Prgs and The Tf Relation For Spiral Galaxiesmentioning

confidence: 99%

Polar Ring Galaxies and the Tully-Fisher relation: implications for the dark halo shape

Arnaboldi¹,

Iodice²,

Bournaud³

et al. 2004

Symp. - Int. Astron. Union

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We have investigated the Tully-Fisher relation for Polar Ring Galaxies (PRGs), based on near infrared, optical and H i data available for a sample of these peculiar objects. The total K-band luminosity, which mainly comes from the central host galaxy, and the measured H i linewidth at 20% of the peak line flux density, which traces the potential in the polar plane, place most polar rings of the sample far from the Tully-Fisher relation defined for spiral galaxies, with -2 -many PRGs showing larger H i linewidths than expected for the observed K band luminosity. This result is confirmed by a larger sample of objects, based on Bband data. This observational evidence may be related to the dark halo shape and orientation in these systems, which we study by numerical modeling of PRG formation and dynamics: the larger rotation velocities observed in PRGs can be explained by a flattened polar halo, aligned with the polar ring.

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C. L. R. James on the Caribbean

Cited by 38 publications

References 0 publications

Somatic polyploidization and cellular proliferation drive body size evolution in nematodes

Somatic polyploidization and cellular proliferation drive body size evolution in nematodes

Complex quantum network model of energy transfer in photosynthetic complexes

Polar Ring Galaxies and the Tully-Fisher relation: implications for the dark halo shape

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