1,715,773 research outputs found
Starfruit Leaves as Glucose Absorption Inhibitor in Mice's Small Intestinal Epithelial Cells
Background: Starfruit (Averrhoa carambola) leaves contain flavone derivatives that exhibit anti-hyperglycemic effects. This study aims to determine the effect of starfruit leaves in reducing glucose absorption in intestinal epithelial cells of mice. Methods: This study was done by performing perfusion on the small intestines of mice. The mice that were used in this study were divided into four groups. The control group was given glucose solution without infused starfruit leaves whereas, the remaining 3 groups were given 3 mmol (540 mg/dL) glucose solution with infused starfruit leaves of varying concentrations; 200, 400, and 600 mg/kg. Samples were collected at 0, 15th, 30th, 45th, and 60th minute. The sample was tested for glucose levels using spectrophotometry. Results: Test of significance showed a significant difference between the control group and the test group with p < 0.05. Conclusions: Starfruit leaves have a reduction effect towards glucose absorption in the small intestines in Wistar strains where the group using 600 mg/kg of infused starfruit leaves have the most significant effect as compared to other groups
Deciding absorption
We characterize absorption in finite idempotent algebras by means of
J\'onsson absorption and cube term blockers. As an application we show that it
is decidable whether a given subset is an absorbing subuniverse of an algebra
given by the tables of its basic operations
Intestinal Absorption
This is the edited transcript of a Witness Seminar held at the Wellcome Institute for the History of Medicine,in London, on 9 February 1999. First published by the Wellcome Trust, 2000. ©The Trustee of the Wellcome Trust, London, 2000.All volumes are freely available online at: www.history.qmul.ac.uk/research/modbiomed/wellcome_witnesses/Annotated and edtied transcript of a Witness Seminar held on 9 February 1999. Introduction by Sir Christopher Booth.Annotated and edtied transcript of a Witness Seminar held on 9 February 1999. Introduction by Sir Christopher Booth.Annotated and edtied transcript of a Witness Seminar held on 9 February 1999. Introduction by Sir Christopher Booth.Annotated and edtied transcript of a Witness Seminar held on 9 February 1999. Introduction by Sir Christopher Booth.A record of a meeting chaired by Lord Turnberg that brought together those from laboratory research and medical practice to discuss some of the key aspects of intestinal absorption, including work on basic physiological mechanisms and techniques, such as the discovery of dedicated transport systems and their localization, and their clinical impact in intestinal disorders and oral rehydration therapy. Participants include: Sir Christopher Booth, Dr Richard Boyd, Professor Ramsey Bronk, Professor Hermon Dowling, Professor Michael Gardner, Dr Michael Hellier, Dr Roy Levin, Professor Richard Naftalin, Professor Timothy Peters, Professor John Walker-Smith and Professor Oliver Wrong. Christie D A, Tansey E M. (eds) (2000) Intestinal absorption, Wellcome Witnesses to Twentieth Century Medicine, vol. 8. London: The Wellcome Trust.The Wellcome Trust is a registered charity, no. 210183
Transmission channels for light in absorbing random media: from diffusive to ballistic-like transport
While the absorption of light is ubiquitous in nature and in applications,
the question remains how absorption modifies the transmission channels in
random media. We present a numerical study on the effects of optical absorption
on the maximal transmission and minimal reflection channels in a
two-dimensional disordered waveguide. In the weak absorption regime, where the
system length is less than the diffusive absorption length, the maximal
transmission channel is dominated by diffusive transport and it is equivalent
to the minimal reflection channel. Its frequency bandwidth is determined by the
underlying quasimode width. However, when the absorption is strong, light
transport in the maximal transmission channel undergoes a sharp transition and
becomes ballistic-like transport. Its frequency bandwidth increases with
absorption, and the exact scaling varies with the sample's realization. The
minimal reflection channel becomes different from the maximal transmission
channel and becomes dominated by absorption. Counterintuitively, we observe in
some samples that the minimum reflection eigenvalue increases with absorption.
Our results show that strong absorption turns open channels in random media
from diffusive to ballistic-like.Comment: 11 pages, 7 figure
Minimal Absorption Measurements
We show that it is not possible to discriminate two close transparencies
without a certain number of photons being absorbed. We extend this to the
discrimination of patterns of transparency (images).Comment: 11 pages (latex
Quantum Stochastic Absorption
We report a detailed and systematic study of wave propagation through a
stochastic absorbing random medium. Stochastic absorption is modeled by
introducing an attenuation constant per unit length in the free
propagation region of the one-dimensional disordered chain of delta function
scatterers. The average value of the logarithm of transmission coefficient
decreases linearly with the length of the sample. The localization length is
given by , where and
are the localization lengths in the presence of only disorder and
of only absorption respectively. Absorption does not introduce any additional
reflection in the limit of large , i.e., reflection shows a monotonic
decrease with and tends to zero in the limit of , in
contrast to the behavior observed in case of coherent absorption. The
stationary distribution of reflection coefficient agrees well with the
analytical results obtained within random phase approximation (RPA) in a larger
parameter space. We also emphasize the major differences between the results of
stochastic and coherent absorption.Comment: RevTex, 6 pages,2 column format, 9 .eps figures include
Soliton absorption spectroscopy
We analyze optical soliton propagation in the presence of weak absorption
lines with much narrower linewidths as compared to the soliton spectrum width
using the novel perturbation analysis technique based on an integral
representation in the spectral domain. The stable soliton acquires spectral
modulation that follows the associated index of refraction of the absorber. The
model can be applied to ordinary soliton propagation and to an absorber inside
a passively modelocked laser. In the latter case, a comparison with water vapor
absorption in a femtosecond Cr:ZnSe laser yields a very good agreement with
experiment. Compared to the conventional absorption measurement in a cell of
the same length, the signal is increased by an order of magnitude. The obtained
analytical expressions allow further improving of the sensitivity and
spectroscopic accuracy making the soliton absorption spectroscopy a promising
novel measurement technique.Comment: 9 pages, 7 figures
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