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Cytoskeletal dynamics and supracellular organisation of cell shape fluctuations during dorsal closure
TLDR
It is suggested that cell shape fluctuations are a property of cells with low and increasing levels of apicalMyosin, and that medial and junctional myosin populations combine to contract AS cell apices and drive DC.
The population genetics of host specificity: genetic differentiation in dove lice (Insecta: Phthiraptera)
TLDR
Examining the genetic structure in the mitochondrial cytochrome oxidase I (COI) gene of two genera of lice occurring on multiple sympatric species of doves in southern North and Central America found that species of Physconelloides exhibited more genetic structure than did species of Columbicola.
Oriented cell divisions and cellular morphogenesis in the zebrafish gastrula and neurula: a time-lapse analysis.
TLDR
It is found that the onset of gastrulation is accompanied by major changes in cell behaviour, and ML divisions within the neuroepithelium appear to be better correlated with changes in tissue morphology associated with neurulation.
Tissue tectonics: morphogenetic strain rates, cell shape change and intercalation
TLDR
This work characterized the basic invariant quantities that measure fundamental classes of cell behavior, namely tensorial rates of cell shape change and cell intercalation and mapped strain rates spatiotemporally in three models of tissue morphogenesis, gaining insight into morphogenetic mechanisms.
Mechanical control of global cell behaviour during dorsal closure in Drosophila
TLDR
A novel image-analysis method is applied to the study of mutant situations and associated a particular genotype with quantitative and reproducible changes in the rate of cell contraction and hence in the overall rate of the process, which reveals the contribution of mechanical elements to the rate and pattern of DC.
Cell shape changes indicate a role for extrinsic tensile forces in Drosophila germ-band extension
TLDR
It is proposed that cell shape change contributing to germ-band extension is a passive response to mechanical forces caused by the invaginating mesoderm.
Individual Cell Migration Serves as the Driving Force for Optic Vesicle Evagination
TLDR
The analysis of mutants demonstrated that the retina-specific transcription factor rx3 determines the convergence and migration behaviors of RPCs, and hence, the migration of individual cells mediates essential steps of organ morphogenesis.
When do parasites fail to speciate in response to host speciation?
TLDR
This work reconstructed trees from mitochondrial and nuclear DNA sequences for pigeons and doves and their feather lice and identified three apparent cases where the host has speciated but the associated parasite has not.
Biodiversity in sub-saharan Africa and its islands : conservation, management and sustainable use
A general overview is provided of biodiversity conservation in Africa which includes the current status and threats the action required for conservation and the priorities. Country profiles describe
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