Archive for the ‘for26cat’ Category
Saturday, June 28th, 2008
Lipase reaction in AOT-isooctane reversed micelles: Effect of water on equilibria.
The effect of water on equilibria for hydrolytic reaction in reversed micelles has been investigated using lipase as a model enzyme. The effect of water on equilibria has been ignored for hydrolase reactions in an ...
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Saturday, June 28th, 2008
Kinetic expression for maltose production from soluble starch by simultaneous use of beta-amylase and debranching enzymes.
The kinetics of the hydrolysis of soluble starch by simultaneous use of beta-amylase and either isoamylase or pullulanse was studied experimentally for a wide range of subtrate and enzyme concentrations. ...
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Saturday, June 28th, 2008
Oxygen transfer in animal cell culture medium.
Both k(L)a and k(L) measurements were carried out by an unsteady state technique at impeller speeds ranging from 1.6 to 5.8 s(-1) in a mechanically agitated animal cell culture vessel of working volume 1.5 L. Checks were made that ...
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Saturday, June 28th, 2008
Catabolite repression of amylase synthesis in yeast.
Amylase synthesis by the yeasts Saccharomycopsis fibuligera and Schwanniomyces castellii and alluvius is repressed by glucose. Steady state continuous culture data for amylase activity, E, biomass concentration, X, and reducing sugar concentration, S, were fitted to the three-parameter catabolite ...
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Saturday, June 28th, 2008
The pH mediated effects of initial glucose concentration on the transitory occurrence of extracellular metabolites, gas exchange and growth yields of aerobic batch cultures of Klebsiella pneumoniae.
The changes in growth kinetics in aerobic batch cultures of Klebsiella pneumoniae were followed by measurements of extracellular metabolites, ...
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Saturday, June 28th, 2008
Mixed solvent systems for recovery of ethanol from dilute aqueous solution by liquid-liquid extraction.
Distribution coefficients and selectivities of a number of mixed solvent systems have been determined in order to assess their suitability in preferentially extracting ethanol from aqueous solution. The measured values of distribution ...
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Saturday, June 28th, 2008
Influence of very small bubbles on k(L)a measurement in viscous microbiological cultures.
In gas-liquid dispersions based on viscous non-Newtonian fluids, numerous very small bubbles are formed due to their high residence times in contacting devices such as bubble columns. The influence of these small bubbles on ...
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Saturday, June 28th, 2008
Adaptive steady-state optimization of biomass productivity in continuous fermentors.
An adaptive steady-state optimization algorithm is presented and applied to the problem of optimizing the production of biomass in continuous fermentation processes. The algorithm requires no modeling information but is based on an on-line identified linear model, ...
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Saturday, June 28th, 2008
NMR probes for measuring magnetic fields and field dynamics in MR systems.
High-resolution magnetic field probes based on pulsed liquid-state NMR are presented. Static field measurements with an error of 10 nanotesla or less at 3 tesla are readily obtained in 100 ms. The further ability ...
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Saturday, June 28th, 2008
Water-fat separation with bipolar multiecho sequences.
Multiecho sequences provide an efficient means to acquire multiple echoes in a single repetition, which has found applications in spectroscopy, relaxometry, and water-fat separation. By replacing the fly-back gradients in unipolar multiecho sequences with alternating readout gradients, bipolar multiecho sequences ...
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Saturday, June 28th, 2008
Spatiotemporal magnetic field monitoring for MR.
MR experiments frequently rely on signal encoding by the application of magnetic fields that vary in both space and time. The accurate interpretation of the resulting signals often requires knowledge of the exact spatiotemporal field evolution during the experiment. To ...
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Saturday, June 28th, 2008
Assessing transneuronal dysfunction utilizing manganese-enhanced MRI (MEMRI).
In this study we utilized manganese-enhanced MRI (MEMRI) to evaluate the in vivo transneuronal efficiency of manganese ion (Mn(2+)) movement as a means to assess overall changes in neuronal function. We designated this extension the manganese transfer index (MTI) ...
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Saturday, June 28th, 2008
Impact of heart rate variability in patients with normal sinus rhythm on image quality in coronary magnetic angiography.
PURPOSE: To evaluate the influence of heart rate variability on image quality in patients with suspected coronary artery disease during magnetic resonance coronary angiography (MRCA). MATERIALS AND METHODS: ...
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Saturday, June 28th, 2008
Principles of whole-body continuously-moving-table MRI.
Continuously-moving-table (CMT) imaging is a new and promising approach to virtually extend the field-of-view (FOV) in currently available MRI systems. It shows high potential to improve a number of applications that require a large FOV, such as whole-body contrast-enhanced angiography and ...
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Saturday, June 28th, 2008
Reproducibility of MRI measurements of right ventricular size and function in patients with normal and dilated ventricles.
PURPOSE: To determine the inter- and intraobserver reproducibility of cardiac magnetic resonance (CMR)-derived measurements of right ventricular (RV) mass, volume, and function in patients with normal and dilated ventricles. ...
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Saturday, June 28th, 2008
Cardiac cine MRI: Quantification of the relationship between fast gradient echo and steady-state free precession for determination of myocardial mass and volumes.
PURPOSE: To determine the correlation function between the steady-state free precession (SSFP) and fast gradient echo (FGRE) cine MRI pulse sequences for measuring the ...
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Saturday, June 28th, 2008
Generalized Reconstruction by Inversion of Coupled Systems (GRICS) applied to free-breathing MRI.
A reconstruction strategy is proposed for physiological motion correction, which overcomes many limitations of existing techniques. The method is based on a general framework allowing correction for arbitrary motion-nonrigid or affine, making it suitable ...
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Saturday, June 28th, 2008
Kalman filtering for real-time navigator processing.
Navigator echoes are used in high-resolution cardiac MRI for tracking physiological motion to suppress motion artifacts. Alternatives to the conventional diaphragm navigator such as the cardiac fat navigator and the k-space center signal (self-navigator) were developed to monitor heart motion ...
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Saturday, June 28th, 2008
Concomitant field terms for asymmetric gradient coils: Consequences for diffusion, flow, and echo-planar imaging.
As a consequence of the Maxwell equations, linear field gradients are accompanied by additional spatially dependent field components. A description of the Maxwell field terms is presented which explicitly takes into account ...
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Saturday, June 28th, 2008
Quantitative myocardial perfusion imaging using different autocalibrated parallel acquisition techniques.
PURPOSE: To compare three different autocalibrated parallel acquisition techniques (PAT) for quantitative and semiquantitative myocardial perfusion imaging. MATERIALS AND METHODS: Seven healthy volunteers underwent myocardial first-pass perfusion imaging at rest using an SR-TrueFISP pulse sequence without ...
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Saturday, June 28th, 2008
Automatic computation of left ventricular ejection fraction from spatiotemporal information in cine-SSFP cardiac MR images.
PURPOSE: To clinically validate an algorithm that automatically computes left ventricular (LV) ejection fraction (LVEF) using a priori geometric and intrinsic spatiotemporal information from cine steady-state free precession (SSFP) MR images. ...
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Saturday, June 28th, 2008
Quantitative brain proton MR spectroscopy based on measurement of the relaxation time T(1) of water.
PURPOSE: To provide a straightforward method for metabolite quantitation in the brain. Tissue water concentration can be determined in a voxel by measuring T(1) and it may provide an internal reference ...
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Saturday, June 28th, 2008
One-stop measurement of iron deposition in the anterior pituitary, liver, and heart in thalassemia patients.
PURPOSE: To assess the feasibility of one-stop evaluation of iron load of myocardium, liver, and anterior pituitary gland in thalassemia patients. MATERIALS AND METHODS: Fifty thalassemia major patients underwent a breath-hold ...
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Saturday, June 28th, 2008
Abnormalities in T2-weighted cardiovascular magnetic resonance images of hypertrophic cardiomyopathy: Regional distribution and relation to late gadolinium enhancement and severity of hypertrophy.
PURPOSE: To explore if focal T2 abnormalities accompany late gadolinium enhancement (LGE) lesions in hypertrophic cardiomyopathy (HCM). MATERIALS AND METHODS: All studies were performed ...
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Saturday, June 28th, 2008
3T MR with diffusion tensor imaging and single-voxel spectroscopy in giant axonal neuropathy.
Magnetic resonance imaging (MRI), diffusion tensor imaging (DTI), and MR spectroscopy (MRS) data were obtained in a patient with giant axonal neuropathy (GAN) and compared to a control group. Fractional anisotropy (FA) and ...
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