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Страница 1 од 106 резултати
Enzymes in ornithine-proline metabolic pathway in bovine lens.
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Various enzyme activities related to ornithine metabolism were studied using bovine lenses, ie, ornithine ketoacid transaminase, delta-1-pyrroline-5-carboxylate reductase, and delta-1-pyrroline-5-carboxylate dehydrogenase. Ornithine ketoacid transaminase activity was found in the lens epithelium;
Ornithine accumulation and metabolism in rat lens.
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The non-protein amino acid ornithine is readily accumulated into rat lenses cultured in TC-199 bicarbonate medium. This accumulation, measured by the lens water/lens medium ratios of radiolabeled ornithine, appears to be the result of an apparent energy-dependent basic amino acid transport system.
Heat shock response of the rat lens.
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The sequence relationship between the small heat shock proteins and the eye lens protein alpha-crystallin (Ingolia, T. D., and E. E. Craig, 1982, Proc. Natl. Acad. Sci. USA, 79: 2360-2364) prompted us to subject rat lenses in organ culture to heat shock and other forms of stress. The effects on
Structure and biosynthesis of rabbit lens capsule collagen.
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The present study was designed to compare collagen synthesized by rabbit lens epithelial cells in culture with rabbit lens capsule collagen. Confluent monolayers of rabbit lens epithelial cells were established. Incorporation of [3H]-proline into glycoproteins secreted into the medium and cell
Assembly of chick and bovine lens-capsule collagen.
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Chick-embryo and adult bovine lens-capsular epithelia in organ culture synthesized 4-hydroxy[3H]proline-containing polypeptides when incubated in the presence of [3H]proline. These collagenous polypeptides of apparent Mr 180 000, 175 000 and 160 000 became incorporated with time into aggregates of
Metabolism of glutamine and glutamate in monkey lens.
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In rat and bovine lenses, the primary source of intracellular glutamate has been shown to be glutamine transported from the surrounding fluids, whereas extracellular glutamate is less readily utilized. For comparison, glutamine and glutamate metabolism were studied in a primate. Fresh, intact lenses
Mass spectrometry-based proteomic analyses of contact lens deposition.
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OBJECTIVE
The purpose of this report is to describe the contact lens deposition proteome associated with two silicone hydrogel contact lenses and care solutions using a mass spectrometric-based approach.
METHODS
This was a randomized, controlled, examiner-masked crossover clinical trial that
Contact Lens-Induced Discomfort and Protein Changes in Tears.
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Ocular discomfort is among the main causes of contact lens wear discontinuation. This study investigated the association between subjective ocular comfort ratings and diurnal changes in tear protein concentrations with and without contact lens wear.
The study was a prospective, open-label,
Purification and characterization of prolyl oligopeptidase from bovine lens.
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Prolyl oligopeptidase (EC 3.4.21.26) has been purified 26,000-fold from bovine lens tissue by anion-exchange chromatography, gel filtration and isoelectric focussing, with an overall yield of 11%. The purified enzyme exhibited an isoelectric point of 4.8, a pH optimum of 7.5 and a molecular mass of
Cleavage of beta crystallins during maturation of bovine lens.
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OBJECTIVE
(1) Identify major crystallin proteins in fetal and adult bovine lens, (2) examine the N-termini of beta-crystallins for truncation, and (3) determine if the protease m-calpain (EC 3.4.22.17) is responsible for the cleavage of bovine beta-crystallins during maturation.
METHODS
Crystallins
Water channel properties of major intrinsic protein of lens.
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The functions of major intrinsic protein (MIP) of lens are still unresolved; however the sequence homology with channel-forming integral membrane protein (CHIP) and other Aquaporins suggests that MIP is a water channel. Immunolocalizations confirmed that Xenopus oocytes injected with bovine MIP cRNA
Isolation and characterization of a new aminopeptidase from bovine lens.
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An aminopeptidase has been purified to homogeneity from bovine lens tissue by gel filtration and DEAE-cellulose chromatography. This enzyme has a molecular weight of 96,000 under both native and denaturing conditions. The purified enzyme hydrolyzed a variety of synthetic substrates as well as di-,
Quantification of individual proteins in silicone hydrogel contact lens deposits.
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OBJECTIVE
The aim of this study was to quantify specific proteins deposited on daily wear silicone hydrogel lenses used in combination with multipurpose disinfecting solutions (MPDSs) by applying multiple-reaction-monitoring mass spectrometry (MRM-MS).
METHODS
Balafilcon A or senofilcon A contact
Lens capsule basement membrane synthesis. Stimulation by glucose in vitro.
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To examine the question of whether hyperglycemia per se can affect basement membrane synthesis, intact rat lenses, which produce basement membrane in vitro, were incubated for 24 h with radioactive proline or lysine and varying concentrations of glucose. Lens capsule basement membrane (LCBM) was
[The enzymatic hydrolysis of proline- and glycocoll-containing di- and tripeptides in the ox lens].
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