Archive for the ‘for26cat’ Category
Saturday, June 28th, 2008
Air-stripping effects on cell growth with volatile substrates.
The removal of substate molecules from aerobic microbial cultures is due to both consumption by microorganisms and stripping by the air stream. The air stripping component can be described by a constant parameter for low concentrations of volatile ...
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Saturday, June 28th, 2008
Affinity partitioning: Development of mathematical model describing behavior of biomolecules in aqueous two-phase systems.
A mathematical model describing the affinity partitioning of macromolecules in aqueous two-phase systems has been derived. The model was used to calculate binding parameters that were compared against values deter mined by ...
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Saturday, June 28th, 2008
Mathematical analysis of two-phase mass transfer in a batch reactor for the chemical transformation of a steroid.
A reactor is described for the conversion of the slightly water-soluble steroid testosterone (T) to 4-androstene-3, 17-dione (4-AD) by enzyme in the presence of excess cofactor. Since the enzyme ...
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Saturday, June 28th, 2008
Characteristics of draft tube gas-liquid-solid fluidized-bed bioreactor with immobilized living cells for phenol degradation.
Biological phenol degradation in a draft tube gas-liquid-solid fluidized bed (DTFB) bioreactor containing a mixed culture immobilized on spherical activated carbon particles was investigated. The characteristics of biofilms including the biofilm dry ...
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Saturday, June 28th, 2008
Evaluation of the effectiveness factor along immobilized enzyme fixed-bed reactors: Design of a reactor with naringinase covalently immobilized into glycophase-coated porous glass.
A design equation is presented for packed-bed reactors containing immobilized enzymes in spherical porous particles with internal diffusion effects and obeying reversible one-intermediate Michaelis-Menten ...
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Saturday, June 28th, 2008
Kinetics of enzymatic lysis and disruption of yeast cells: II. A simple model of lysis kinetics.
A simple two-step model is proposed to describe the kinetics of the two lytic systems examined in the preceding article. The model predicts concentrations of yeast solids, soluble proteins, peptides, ...
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Saturday, June 28th, 2008
Kinetics of enzymatic lysis and disruption of yeast cells: I. Evaluation of two lytic systems with different properties.
Many microorganisms produce enzymes which lyse the walls of yeasts, fungi, and bacteria. The proportions of different enzyme activities present in the lytic system, their action patterns, synergism, ...
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Saturday, June 28th, 2008
Pullulan from peat hydrolyzate fermentation kinetics.
The Luedeking-Piret equation was used to fit the kinetic data of pullulan fermentations from peat hydrolyzate substrate. In batch mode, the kinetic parameters m, n, alpha, and beta varied as a function of fermentation conditions: aeration rate, agitation speed, and ...
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Saturday, June 28th, 2008
Percutaneous radiofrequency ablation of liver cancer in the hepatic dome using the intrapleural fluid infusion technique.
BACKGROUND:: Intrapleural fluid infusion improves ultrasonographic visualization of tumours in the hepatic dome. The aim of this study was to assess the safety and long-term efficacy of ultrasonographically guided percutaneous ...
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Saturday, June 28th, 2008
Moment and direction of the spoiler gradient for effective artifact suppression in RF-spoiled gradient echo imaging.
Radiofrequency (RF) -spoiled gradient echo sequences were developed with the aim to produce images with T(1) weighted contrast within short acquisition time. Over the past two decades, this type of ...
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Saturday, June 28th, 2008
Four-dimensional MR microscopy of the mouse heart using radial acquisition and liposomal gadolinium contrast agent.
Magnetic resonance microscopy (MRM) has become an important tool for small animal cardiac imaging. In relation to competing technologies (microCT and ultrasound), MR is limited by spatial resolution, temporal resolution, and ...
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Saturday, June 28th, 2008
Influence of iron chelation on R1 and R2 calibration curves in gerbil liver and heart.
MRI is gaining increasing importance for the noninvasive quantification of organ iron burden. Since transverse relaxation rates depend on iron distribution as well as iron concentration, physiologic and pharmacologic processes that ...
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Saturday, June 28th, 2008
Evaluation of an AIF correction algorithm for dynamic susceptibility contrast-enhanced perfusion MRI.
For longitudinal studies in patients suffering from cerebrovascular diseases the poor reproducibility of perfusion measurements via dynamic susceptibility-weighted contrast-enhanced MRI (DSC-MRI) is a relevant concern. We evaluate a novel algorithm capable of overcoming limitations ...
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Saturday, June 28th, 2008
Modeling the effects of dispersion and pulsatility of blood flow in pulsed arterial spin labeling.
Arterial spin labeling (ASL) is a method of using MRI to image cerebral perfusion. For the measurement to be calibrated, a model is required describing the kinetics of the flow of ...
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Saturday, June 28th, 2008
Serial in vivo positive contrast MRI of iron oxide-labeled embryonic stem cell-derived cardiac precursor cells in a mouse model of myocardial infarction.
Myocardial regeneration with stem-cell transplantation is a possible treatment option to reverse deleterious effects that occur after myocardial infarction. Since little is known about ...
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Saturday, June 28th, 2008
In Vivo Monitoring of Intravenously Injected Gold Nanorods Using Near-Infrared Light.
Gold nanorods showing surface plasmon (SP) bands in the near-IR region are used as bioimaging probes that respond to near-IR light in mice. The SP bands of intravenously injected polyethylene glycol-modified gold nanorods are directly ...
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Saturday, June 28th, 2008
Directed Aerosol Writing of Ordered Silica Nanostructures on Arbitrary Surfaces with Self-Assembling Inks.
This paper reports the fabrication of micro- and macropatterns of ordered mesostructured silica on arbitrary flat and curved surfaces using a facile robot-directed aerosol printing process. Starting with a homogenous solution of soluble ...
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Saturday, June 28th, 2008
Quantification of choline- and ethanolamine-containing metabolites in human prostate tissues using (1)H HR-MAS total correlation spectroscopy.
A fast and quantitative 2D high-resolution magic angle spinning (HR-MAS) total correlation spectroscopy (TOCSY) experiment was developed to resolve and quantify the choline- and ethanolamine-containing metabolites in human prostate tissues ...
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Saturday, June 28th, 2008
Nuclear magnetic resonance-based metabolomics predicts exercise-induced ischemia in patients with suspected coronary artery disease.
The purpose of this study was to develop a (1)H-nuclear magnetic resonance metabolomic approach capable of predicting the occurrence of exercise-induced ischemia in patients with suspected coronary artery disease and to identify ...
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Saturday, June 28th, 2008
Estimating intracellular lithium in brain in vivo by localized (7)Li magnetic resonance spectroscopy.
The therapeutic mechanism of action of lithium (Li) in bipolar disorder is unknown. While Li is presumed to work intracellularly in the brain, the fraction of intracellular Li in the brain in vivo ...
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Saturday, June 28th, 2008
In vivo MRI using real-time production of hyperpolarized (129)Xe.
MR imaging of hyperpolarized (HP) nuclei is challenging because they are typically delivered in a single dose of nonrenewable magnetization, from which the entire image must be derived. This problem can be overcome with HP (129)Xe, which ...
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Saturday, June 28th, 2008
MRI and contrast-enhanced ultrasound monitoring of prostate microwave focal thermal therapy: An in vivo canine study.
PURPOSE: To compare the value of diffusion-weighted MRI (DWI), dynamic contrast-enhanced (DCE) MRI, and microbubble contrast-enhanced ultrasound (CEUS) for assessment of the thermal lesion created by interstitial microwave heating of ...
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Saturday, June 28th, 2008
Detection of lymph node metastasis in cervical and uterine cancers by diffusion-weighted magnetic resonance imaging at 3T.
PURPOSE: To evaluate diffusion-weighted imaging (DWI) for detection of pelvic lymph node metastasis in patients with cervical and uterine cancers. MATERIALS AND METHODS: Fifty patients scheduled for pelvic lymph ...
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Saturday, June 28th, 2008
Circumferential strain in the wall of the common carotid artery: Comparing displacement-encoded and cine MRI in volunteers.
The walls of conduit arteries undergo cyclic stretching from the periodic fluctuation of arterial pressure. Atherosclerotic lesions have been shown to localize to regions of excessive stretching of the ...
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Saturday, June 28th, 2008
MR tracking of transplanted cells with \"positive contrast\" using manganese oxide nanoparticles.
Rat glioma cells were labeled using electroporation with either manganese oxide (MnO) or superparamagnetic iron oxide (SPIO) nanoparticles. The viability and proliferation of SPIO-labeled cells (1.9 mg Fe/ml) or cells electroporated with a low ...
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