7,048 research outputs found
Weak helix submanifolds of euclidean spaces
It is shown that there exist nonstrong weak 2-helix surfaces of R
Effect of Lupinus albus as protein supplement on yield, constituents, clotting properties and fatty acid composition in ewes' milk
The effect of feeding lupin seeds (Lupinus albus L.) as an alternative protein source in ewe diets was investigated. Two groups of 18 Sarda ewes were fed two different isonitrogenous diets: with lupin (L) seed, given after 12 h soaking, or soybean meal (SBM) as the main protein source. DMI, variations of body weight and milk production were unaffected by the treatment. Although not statistically significant, in the group fed L diet the production of milk fat and protein was higher. Clotting properties of milk were similar for the two treatments, probably due to the small differences in the milk protein contents. The fatty acid profile of milk was affected by treatment with a larger content of short (14.19 wt% versus 12.26 wt%)- and medium (49.37 wt% versus 47.76 wt%)-chain fatty acids in milk from ewes fed the L diet. CLA content was unaffected by treatment. Triglyceride content of fat from the two diets reflects the milk fatty acid composition. Indeed, milk from L diet showed a higher level of medium-chain triglycerides, which are of particular interest to consumers with concerns over health and heart disease. The inclusion of lupin seed in the diet of lactation ewes can be a means of achieving a more desirable triglyceride profile in milk fat. Milk with enhanced nutritive quality may promote wider market penetration of sheep dairy products
Hyphal growth of phagocytosed fusarium oxysporum causes cell lysis and death of murine macrophages
Peer reviewedPublisher PD
Semianalytical quantum model for graphene field-effect transistors
We develop a semianalytical model for monolayer graphene field-effect
transistors in the ballistic limit. Two types of devices are considered: in the
first device, the source and drain regions are doped by charge transfer with
Schottky contacts, while, in the second device, the source and drain regions
are doped electrostatically by a back gate. The model captures two important
effects that influence the operation of both devices: (i) the finite density of
states in the source and drain regions, which limits the number of states
available for transport and can be responsible for negative output differential
resistance effects, and (ii) quantum tunneling across the potential steps at
the source-channel and drain-channel interfaces. By comparison with a
self-consistent non-equilibrium Green's function solver, we show that our model
provides very accurate results for both types of devices, in the bias region of
quasi-saturation as well as in that of negative differential resistance.Comment: 10 pages, 14 figure
G-quadruplex ligands exhibit differential G-tetrad selectivity.
A rapid and simple equilibrium-binding assay mediated by ligand-induced fluorescence quenching of fluorophore-labelled G-quadruplex (G4) structures enabled quantitative interrogation of mutually exclusive ligand binding interactions at opposed G-tetrads. This technique revealed that the ligands TmPyP4, PhenDC3, and PDS have differential chemotype-specific binding preferences for individual G-tetrads of a model genomic G4 structure.This work was supported by the following grants: Cancer
Research UK Programme, BBSRC BB/K018043/1 and EPSRC EP/
K039520/1. We thank Dr Chris Lowe for his constructive comments
and for proofreading the manuscript.This is the final published version. It was first made available by RSC at http://pubs.rsc.org/en/Content/ArticleLanding/2015/CC/c5cc02252e#!divAbstract
Full Counting Statistics of Spin Currents
We discuss how to detect fluctuating spin currents and derive full counting
statistics of electron spin transfers. It is interesting to consider several
detectors in series that simultaneously monitor different components of the
spins transferred. We have found that in general the statistics of the
measurement outcomes cannot be explained with the projection postulate and
essentially depends on the quantum dynamics of the detectors.Comment: twocolumns, 4 pages, 2 figure
Hierarchical Model for the Evolution of Cloud Complexes
The structure of cloud complexes appears to be well described by a "tree
structure" representation when the image is partitioned into "clouds". In this
representation, the parent-child relationships are assigned according to
containment. Based on this picture, a hierarchical model for the evolution of
Cloud Complexes, including star formation, is constructed, that follows the
mass evolution of each sub-structure by computing its mass exchange
(evaporation or condensation) with its parent and children, which depends on
the radiation density at the interphase. For the set of parameters used as a
reference model, the system produces IMFs with a maximum at too high mass (~2
M_sun) and the characteristic times for evolution seem too long. We show that
these properties can be improved by adjusting model parameters. However, the
emphasis here is to illustrate some general properties of this nonlinear model
for the star formation process. Notwithstanding the simplifications involved,
the model reveals an essential feature that will likely remain if additional
physical processes are included. That is: the detailed behavior of the system
is very sensitive to variations on the initial and external conditions,
suggesting that a "universal" IMF is very unlikely. When an ensemble of IMFs
corresponding to a variety of initial or external conditions is examined, the
slope of the IMF at high masses shows variations comparable to the range
derived from observational data. (Abridged)Comment: Latex, 29 pages, 13 figures, accepted for publication in Ap
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