13,918 research outputs found

    SONNET 29

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    Allyn Wood uses symbolism to a rather large extent, and quite effectively, I believe. We are introduced to one of the cats, with its characteristic reserve and mystery, in the first paragraph, whereby an ominous atmosphere is created. Miss Wood continues to bring in cats and more cats until we feel just as Argus did about their penetrating presence. The cat, that creature of abstract mystery, quiet ubiquity and impenetrable character, certainly symbolizes the very existence of father and son in a house made mysterious by the father\u27s continual probing for knowledge of what is beyond mortal senses to know

    Within the Pillars of Hercules

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    The Kiona’s hull sliced neatly through the batting waves, her sails pulling forward with the ceaseless breath of the northwestern winds. The boards of the ship hummed beneath Carrice Leon’s feet, interlaced with the rhythmic beating of 170 oars against serene waters. In the distance, white spires were beginning to peak just above the starboard horizon, a shimmering beacon in the endless blue. They were making good time, despite the previous day’s storm. Carrice looked up to find the sun high in the sky. “Starboard side, in-oars!” Her voice boomed across the length of the deck, ringing clear over the wind and waves below. The crew manning the right side of the deck clattered their oars into oarlocks as the port side continued to row in perfect synchrony. Carrice nodded to herself as the soft wood of the helm’s wheel glided smoothly against her hands, nudging the Kiona further starboard. “Oars in,” she commanded; more clattering of oars onto the deck ensued. The ship was running with the wind. Why not show off a little and sail in. [excerpt

    Comment: The 2005 Neyman Lecture: Dynamic Indeterminism in Science

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    Comment on ``The 2005 Neyman Lecture: Dynamic Indeterminism in Science'' [arXiv:0808.0620]Comment: Published in at http://dx.doi.org/10.1214/07-STS246A the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org

    The Effect of Insurance Premium Taxes on Employment

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    This report provides estimates of the effect of the insurance premium taxes on state-level employment in the insurance industry. FRC Report 18

    Adhesive and mechanical regulation of mesenchymal stem cell differentiation in human bone marrow and periosteum-derived progenitor cells

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    It has previously been demonstrated that cell shape can influence commitment of human bone marrow-derived mesenchymal stem cells (hBMCs) to adipogenic, osteogenic, chondrogenic, and other lineages. Human periosteum-derived cells (hPDCs) exhibit multipotency similar to hBMCs, but hPDCs may offer enhanced potential for osteogenesis and chondrogenesis given their apparent endogenous role in bone and cartilage repair in vivo. Here, we examined whether hPDC differentiation is regulated by adhesive and mechanical cues comparable to that reported for hBMC differentiation. When cultured in the appropriate induction media, hPDCs at high cell seeding density demonstrated enhanced levels of adipogenic or chondrogenic markers as compared with hPDCs at low cell seeding density. Cell seeding density correlated inversely with projected area of cell spreading, and directly limiting cell spreading with micropatterned substrates promoted adipogenesis or chondrogenesis while substrates promoting cell spreading supported osteogenesis. Interestingly, cell seeding density influenced differentiation through both changes in cell shape and non-shape-mediated effects: density-dependent adipogenesis and chondrogenesis were regulated primarily by cell shape whereas non-shape effects strongly influenced osteogenic potential. Inhibition of cytoskeletal contractility by adding the Rho kinase inhibitor Y27632 further enhanced adipogenic differentiation and discouraged osteogenic differentiation of hPDCs. Together, our results suggest that multipotent lineage decisions of hPDCs are impacted by cell adhesive and mechanical cues, though to different extents than hBMCs. Thus, future studies of hPDCs and other primary stem cell populations with clinical potential should consider varying biophysical metrics for more thorough optimization of stem cell differentiation.R01 EB000262 - NIBIB NIH HHS; R01 GM060692 - NIGMS NIH HHSPublished versio
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