94 research outputs found
Effect of aureomycin on the behaviour of certain free amino acids in oil sardine (Sardinella longiceps) held in ice storage
The course of development of a few free amino acids under the influence of aureomycin in oil sardine (Sardinella lingiceps) held in ice storage was investigated. The levels of leucines and valine regularly increased in the control and aureomycin treated fush throughout the storage period. Alanines and threonine showed similar trend in both control and fish treated with 20ppm aureomycin. These amino acids however showed a gradual fall in fish treated at 5 ppm level. The changes in tyrosine+tryptophane were found to be irregular. Most of the amino acids studied indicated a remarkable change in trend by about the 16th day of ice storage in the case of fish treated with 50ppm aureimycin
Shrinkage of the distal renal artery 1 year after stent placement as evidenced with serial intravascular ultrasound
The objective of this study was to determine the quantitative
intravascular ultrasound (IVUS) and angiographic changes that occur during
1 year follow-up after renal artery stent placement, given that restenosis
continues to be a limitation of renal artery stent placement. 38
consecutive patients with symptomatic renal artery stenosis treated with
Palmaz stent placement were studied prospectively. IVUS and angiography
were performed at the time of stent placement and at 1 year follow-up. At
follow-up, angiographic restenosis was seen in 14% of patients. The lumen
area in the stent, seen with IVUS, was significantly decreased from
24+/-5.6 mm(2) to 17+/-5.6 mm(2) (p<0.001) solely due to plaque
accumulation. The distal main renal artery showed a significant decrease
in lumen area owing to a significant vessel area decrease from 39+/-14.0
mm(2) to 29+/-9.3 mm(2) (p<0.001) without plaque accumulation.
Angiographic analysis confirmed this reduction in luminal diameter and
showed that the distal renal artery diameter at follow-up was
significantly smaller than before stent placement (86+/-23.0% vs
104+/-23.9% of the contralateral renal artery diameter; p=0.003). Besides
plaque accumulation in the stent, unexplained shrinkage of the distal main
renal artery was evidenced with IVUS and angiography 1 year following
stent placement
Intravascular ultrasound evidence for coarctation causing symptomatic renal artery stenosis
BACKGROUND: A recent study of human cadaveric renal arteries revealed that
renal artery narrowing could be due not only to atherosclerotic plaque
compensated for by adaptive remodeling, but also to hitherto undescribed
focal narrowing of an otherwise normal renal arterial wall (ie,
coarctation). The present study investigated whether vessel coarctation
could be identified in patients with symptomatic renal artery stenosis
(RAS). METHODS AND RESULTS: Consecutive symptomatic patients with
angiographically proven atherosclerotic RAS who were referred for stent
placement were studied by 30-MHz intravascular ultrasound before
intervention (n=18) or after predilatation (n=18). Analysis included
assessment of the media-bounded area and plaque area (PLA) at the most
stenotic site and at a distal reference site (most distal cross-section in
the main renal artery with normal appearance). Coarctation was considered
present whenever the target/reference media-bounded area was </=85%.
Before intervention, coarctation was observed in 9 of 18 patients and
adaptive remodeling in 9 of 18 patients. Coarctation lesions had a
significantly smaller PLA than adaptive remodeled lesions (P=0.001).
Similarly, despite predilatation, coarctation was seen in 8 of 18 patients
who had significantly smaller PLAs (P=0. 008) when compared with those
patients who had adaptive remodeled lesions. No differences in severity of
RAS or angiographic or clinical parameters were observed. CONCLUSIONS:
Low-plaque coarctation may cause a considerable proportion of symptomatic
RAS, which is angiographically and clinically indistinguishable from
plaque-rich RAS
Screening current effects in Josephson junction arrays
The purpose of this work is to compare the dynamics of arrays of Josephson
junctions in presence of magnetic field in two different frameworks: the so
called XY frustrated model with no self inductance and an approach that takes
into account the screening currents (considering self inductances only). We
show that while for a range of parameters the simpler model is sufficiently
accurate, in a region of the parameter space solutions arise that are not
contained in the XY model equations.Comment: Figures available from the author
Stent placement for renal arterial stenosis: where do we stand? A meta-analysis
PURPOSE: To perform a meta-analysis of renal arterial stent placement in
comparison with renal percutaneous transluminal angioplasty (PTA) in
patients with renal arterial stenosis. MATERIALS AND METHODS: Studies
dealing with renal arterial stent placement (14 articles; 678 patients)
and renal PTA (10 articles; 644 patients) published up to August 1998 were
selected. A random-effects model was used to pool the data. RESULTS: Renal
arterial stent placement proved highly successful, with an initial
adequate performance in 98% and major complications in 11%. The overall
cure rate for hypertension was 20%, whereas hypertension was improved in
49%. Renal function improved in 30% and stabilized in 38% of patients. The
restenosis rate at follow-up of 6-29 months was 17%. Stent placement had a
higher technical success rate and a lower restenosis rate than did renal
PTA (98% vs 77% and 17% vs 26%, respectively; P <.001). The complication
rate was not different between the two treatments. The cure rate for
hypertension was higher and the improvement rate for renal function was
lower after stent placement than after renal PTA (20% vs 10% and 30% vs
38%, respectively; P <.001). CONCLUSION: Renal arterial stent placement is
technically superior and clinically comparable to renal PTA alone
Multiport Well Design for Sampling of Ground Water at Closely Spaced Vertical Intervals
Magnetic Field Amplification in Galaxy Clusters and its Simulation
We review the present theoretical and numerical understanding of magnetic
field amplification in cosmic large-scale structure, on length scales of galaxy
clusters and beyond. Structure formation drives compression and turbulence,
which amplify tiny magnetic seed fields to the microGauss values that are
observed in the intracluster medium. This process is intimately connected to
the properties of turbulence and the microphysics of the intra-cluster medium.
Additional roles are played by merger induced shocks that sweep through the
intra-cluster medium and motions induced by sloshing cool cores. The accurate
simulation of magnetic field amplification in clusters still poses a serious
challenge for simulations of cosmological structure formation. We review the
current literature on cosmological simulations that include magnetic fields and
outline theoretical as well as numerical challenges.Comment: 60 pages, 19 Figure
Active Brownian Particles. From Individual to Collective Stochastic Dynamics
We review theoretical models of individual motility as well as collective
dynamics and pattern formation of active particles. We focus on simple models
of active dynamics with a particular emphasis on nonlinear and stochastic
dynamics of such self-propelled entities in the framework of statistical
mechanics. Examples of such active units in complex physico-chemical and
biological systems are chemically powered nano-rods, localized patterns in
reaction-diffusion system, motile cells or macroscopic animals. Based on the
description of individual motion of point-like active particles by stochastic
differential equations, we discuss different velocity-dependent friction
functions, the impact of various types of fluctuations and calculate
characteristic observables such as stationary velocity distributions or
diffusion coefficients. Finally, we consider not only the free and confined
individual active dynamics but also different types of interaction between
active particles. The resulting collective dynamical behavior of large
assemblies and aggregates of active units is discussed and an overview over
some recent results on spatiotemporal pattern formation in such systems is
given.Comment: 161 pages, Review, Eur Phys J Special-Topics, accepte
Physiological potential of soybean seeds after maturation and submitted to artificial drying
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