2,087 research outputs found
Measurement of the Proteinase Inhibitors of the Bovine Pancreas by Radioimmunoassay
Bovine pancreas contains two polypeptide trypsin inhibitors that are not homologous and differ in their inhibitory activity towards chymotrypsin, kallikrein, elastase, and other serine proteinases. The Kunitz inhibitor and the Kazal inhibitor are present in approximately equimolar concentrations in bovine pancreatic tissue, yet only the Kazal inhibitor is detectable in the pancreatic juice. The Kazal inhibitor has been named the pancreatic secretory trypsin inhibitor, PSTI because its concentration in the pancreatic juice parallels that of the exocrine secretory proteins. The Kunitz inhibitor is considered the intracellular inhibitor, however, no direct information is available concerning the intracellular localization of these inhibitors in the pancreas. The preparation of /sup 125/I-labeled derivatives of Kazal and Kunitz inhibitors by the lactoperoxidase method and a radioimmunoassay for each inhibitor are described
Chromatographic systems for desalting and separating kinins: Application to trypsin-treated human plasma
SP-Sephadex equilibrium chromatography of bradykinin and related peptides: Application to trypsin-treated human plasma
An analytical method is deseribed for the separation of bradykinin, Lys-bradykinin, and Met-Lys-bradykinin by equilibrium chromatography on SP-Sephadex C-25 eluted in 0.02 Tris-HCl buffer, pH 8.10, 0.12 NaCl. A second elution buffer, 0.02 Tris-HCl buffer, pH 7.70, 0.06 NaCl, serves as a second parameter for the identification of bradykinin and also separates the hormone from plasma bradykinin-potentiating peptides. Ten to one-hundred nanomoles of each peptide can be recovered in high yields, identified by elution position, and measured by bioassay with the isolated guinea pig ileum. The identification of bradykinin as the peptide released by trypsin acting on acid-denatured plasma is documented as an illustration of the method
Properties of Active Galaxies Deduced from H I Observations
We completed a new survey for H I emission for a large, well-defined sample
of 154 nearby (z < 0.1) galaxies with type 1 AGNs. We make use of the extensive
database presented in a companion paper to perform a comprehensive appraisal of
the cold gas content in active galaxies and to seek new strategies to
investigate the global properties of the host galaxies and their relationship
to their central black holes (BHs). We show that the BH mass obeys a strong,
roughly linear relation with the host galaxy's dynamical mass. BH mass follows
a looser, though still highly significant, correlation with the maximum
rotation velocity of the galaxy, as expected from the known scaling between
rotation velocity and central velocity dispersion. Neither of these H I-based
correlations is as tight as the more familiar relations between BH mass and
bulge luminosity or velocity dispersion, but they offer the advantage of being
insensitive to the glare of the nucleus and therefore are promising new tools
for probing the host galaxies of both nearby and distant AGNs. We present
evidence for substantial ongoing BH growth in the most actively accreting AGNs.
In these nearby systems, BH growth appears to be delayed with respect to the
assembly of the host galaxy but otherwise has left no detectable perturbation
to its mass-to-light ratio or its global gas content. The host galaxies of type
1 AGNs, including those luminous enough to qualify as quasars, are generally
gas-rich systems, possessing a cold interstellar medium reservoir at least as
abundant as that in inactive galaxies of the same morphological type. This
calls into question current implementations of AGN feedback in models of galaxy
formation that predict strong cold gas depletion in unobscured AGNs. (Abridged)Comment: To appear in ApJ; 14 page
Algebraic approach in the study of time-dependent nonlinear integrable systems: Case of the singular oscillator
The classical and the quantal problem of a particle interacting in
one-dimension with an external time-dependent quadratic potential and a
constant inverse square potential is studied from the Lie-algebraic point of
view. The integrability of this system is established by evaluating the exact
invariant closely related to the Lewis and Riesenfeld invariant for the
time-dependent harmonic oscillator. We study extensively the special and
interesting case of a kicked quadratic potential from which we derive a new
integrable, nonlinear, area preserving, two-dimensional map which may, for
instance, be used in numerical algorithms that integrate the
Calogero-Sutherland-Moser Hamiltonian. The dynamics, both classical and
quantal, is studied via the time-evolution operator which we evaluate using a
recent method of integrating the quantum Liouville-Bloch equations \cite{rau}.
The results show the exact one-to-one correspondence between the classical and
the quantal dynamics. Our analysis also sheds light on the connection between
properties of the SU(1,1) algebra and that of simple dynamical systems.Comment: 17 pages, 4 figures, Accepted in PR
Proteomic analysis of total cellular proteins of human neutrophils
This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens
Open Access
Stable SET knockdown in head and neck squamous cell carcinoma promotes cell invasion and the mesenchymal-like phenotype in vitro, as well as necrosis, cisplatin sensitivity and lymph node metastasis in xenograft tumor model
Popularity functions, partisan effects, and support in parliament
This paper analyzes the popularity of the main political entities in Portugal. Estimation results of popularity functions validate the responsibility hypothesis, with unemployment, and to a lesser extent inflation, affecting popularity levels. There is also evidence of personality effects, of popularity erosion over consecutive terms and of honeymoon effects. Finally, we found that voters' evaluations of incumbents' performance regarding unemployment is affected by their support in Parliament when an incumbent faces more opposition in Parliament, voters are less likely to hold him responsible for unemployment increases.(undefined
Transmission Spectra of Transiting Planet Atmospheres: Model Validation and Simulations of the Hot Neptune GJ 436b for JWST
We explore the transmission spectrum of the Neptune-class exoplanet GJ 436b,
including the possibility that its atmospheric opacity is dominated by a
variety of non- equilibrium chemical products. We also validate our
transmission code by demonstrating close agreement with analytic models that
use only Rayleigh scattering or water vapor opacity. We find broad disagreement
with radius variations predicted by another published model. For GJ 436b, the
relative coolness of the planet's atmosphere, along with its implied high
metallicity, may make it dissimilar in character compared to "hot Jupiters."
Some recent observational and modeling efforts suggest low relative abundances
of H2O and CH4 present in GJ 436b's atmosphere, compared to calculations from
equilibrium chemistry. We include these characteristics in our models and
examine the effects of absorption from methane-derived higher order
hydrocarbons. Significant absorption from HCN and C2H2 are found throughout the
infrared, while C2H4 and C2H6 are less easily seen. We perform detailed
simulations of JWST observations, including all likely noise sources, and find
that we will be able to constrain chemical abundance regimes from this planet's
transmission spectrum. For instance, the width of the features at 1.5, 3.3, and
7 microns indicates the amount of HCN versus C2H2 present. The NIRSpec prism
mode will be useful due to its large spectral range and the relatively large
number of photo-electrons recorded per spectral resolution element. However,
extremely bright host stars like GJ 436 may be better observed with a higher
spectroscopic resolution mode in order to avoid detector saturation. We find
that observations with the MIRI low resolution spectrograph should also have
high signal-to-noise in the 5 - 10 micron range due to the brightness of the
star and the relatively low spectral resolution (R ~ 100) of this mode.Comment: 33 pages, 12 figures, Accepted to Ap
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