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25 documents, page 1 of 3

Adipose-derived stem cell: A better stem cell than BMSC

Zhu, Y; Liu, T; Song, K; Fan, X; Ma, X; Cui, Z (2008)
To further study the proliferation and multi-differentiation potentials of adipose-derived stem cells (ADSCs), the cells were isolated with improved methods and their growth curves were achieved with cck-8. Surface protein expression was analyzed by flow cytometry to characterize the cell phenotype. The multi-lineage potential of ADSCs was testified by differentiating cells with adipogenic, chondrogenic, osteogenic, and myogenic inducers. The results showed that about 5x10

Enzyme kinetics far from the standard quasi-steady-state and equilibrium approximations

Schnell, S; Maini, PK (2002)
Analytic approximations of the time-evolution of the single enzyme-substrate reaction are valid for all but a small region of parameter space in the positive initial enzyme-initial substrate concentration plane. We find velocity equations for the substrate decomposition and product formation with the aid of the total quasi-steady-state approximation and an aggregation technique for cases where neither the more normally employed standard nor reverse quasi-steady-state approximations are valid....

On the group rings of abelian minimax groups, II: The singular case

Segal, Dan (2006)
The main results of [D. Segal, On the group rings of abelian minimax groups, J. Algebra 237 (2001) 64–94], and of related papers by J.E. Roseblade and C.J.B. Brookes, are extended to group rings kG where the characteristic of the field k occurs in the spectrum of the abelian minimax group G.

Design of bright, fiber-coupled and fully factorable photon pair sources

Edgar Vicent, L; U'Ren, AB; Rangarajan, R; Osorio, CI; Torres, JP; Zhang, L; Walmsley, IA (2010)
From quantum computation to quantum key distribution, many quantum-enhanced applications rely on the ability to generate pure single photons. Even though the process of spontaneous parametric downconversion (SPDC) is widely used as the basis for photon-pair sources, the conditions for pure heralded single-photon generation, taking into account both spectral and spatial degrees of freedom, have not been fully described. We present an analysis of the spatio-temporal correlations present in phot...

Use of composite rotations to correct systematic errors in NMR quantum computation

Cummins, HK; Jones, JA (2000)
We implement an ensemble quantum counting algorithm on three NMR spectrometers with 1 H resonance frequencies of 500, 600 and 750 MHz. At higher frequencies, the results deviate markedly from naive theoretical predictions. These systematic errors can be attributed almost entirely to off-resonance effects, which can be substantially corrected for using fully compensating composite rotation pulse sequences originally developed by Tycko. We also derive an analytic expression for generating such ...

The importance of vertical velocity variability for estimates of the indirect aerosol effects

West, REL; Stier, P; Jones, A; Johnson, CE; Mann, GW; Bellouin, N; Kipling, Z (2013)
Projects: EC | ACCLAIM (280025)
The activation of aerosols to form cloud droplets is dependent upon vertical velocities whose local variability is not typically resolved at the GCM grid scale. Consequently, it is necessary to represent the sub-grid-scale variability of vertical velocity in the calculation of cloud droplet number concentration. This study uses the UK Chemistry and Aerosols community model (UKCA) within the Hadley Centre Global Environmental Model (HadGEM3), coupled for the first time to an explicit aerosol ...

Multi-qubit gates in arrays coupled by 'always-on' interactions

Benjamin, SC (2004)
Recently, there has been interest in the idea of quantum computing without control of the physical interactions between component qubits. This is highly appealing since the 'switching' of such interactions is a principal difficulty in creating real devices. It has been established that one can employ 'always-on' interactions in a one-dimensional Heisenberg chain, provided that one can tune the Zeeman energies of the individual (pseudo-)spins. It is important to generalize this scheme to highe...

On Young modules of general linear groups,  

Schroll, S; Erdmann, K (2007)
We study ℓ-permutation modules of finite general linear groups GLn(q) acting on partial flags in the natural module, where the coefficient field of the modules has characteristic ℓ, for ℓandnmid;q. We call the indecomposable summands of these permutation modules linear Young modules. We determine their vertices and Green correspondents, by methods relying only on the representation theory of GLn(q). Furthermore, we show that when the multiplicative order of q modulo ℓ is strictly greater t...

Effects of intensive blood pressure lowering on cardiovascular and renal outcomes: a systematic review and meta-analysis

Lv, J; Neal, B; Ehteshami, P; Ninomiya, T; Woodward, M; Rodgers, A; Wang, H; MacMahon, S; Turnbull, F; Hillis, G; Chalmers, J; Perkovic, V (2012)
Editors' Summary Background About a third of US and UK adults have high blood pressure (hypertension). Although hypertension has no obvious symptoms, it can lead to heart attacks, stroke, and other forms of cardiovascular disease, to kidney failure, and to retinopathy (blindness caused by damage to the blood vessels in the back of the eye). Hypertension is diagnosed by measuring blood pressure (BP)—the force that blood moving around the body exerts on the inside of large blood vessels. BP is ...

Clinically immune hosts as a refuge for drug-sensitive malaria parasites

Klein, E; Smith, DL; Boni, MF; Laxminarayan, R (2008)
Abstract Background Mutations in Plasmodium falciparum that confer resistance to first-line antimalarial drugs have spread throughout the world from a few independent foci, all located in areas that were likely characterized by low or unstable malaria transmission. One of the striking differences between areas of low or unstable malaria transmission and hyperendemic areas is the difference in the size of the population of immune individuals. However, epidemiological models of malaria transmis...