Acute uremia was induced in rats with temporary clamping of the left renal pedicle and contralateral nephrectomy. Jejunal peptidase activities (aminopeptidase N, dipeptidyl peptidase IV and ...aminopeptidase A), disaccharidase activities (maltase, sucrase, lactase and trehalase) and morphology were studied. A significant (p less than 0.05) increase in aminopeptidase N activity and a positive correlation between aminopeptidase N activity and serum urea was found in the uremic rats. The other peptidase activities showed a slight increase in the uremic rats. A shortening of the microvilli of the small intestinal epithelial cells in the uremic rats was seen by electron microscopy. The disaccharidase activities was unaltered. This study shows the presence of functional alterations in the small intestine in rats with acute uremia. The observations are also compatible with different regulation mechanisms for the brush border peptidases and disaccharidases.
In order to study the significance of the proposed galactose‐pentose pathway for galactose metabolism in Ophiostoma multiannulatum (Lindberg 1970 b) we prepared a strain which had both this and the ...Leloir pathway functioning. UV was used for induction of mutations in the genes controlling enzymes of the Leloir pathway. Two mutants with enzymatic blocks in the Leloir pathway were isolated. The mutants were phenotypically characterized and it was concluded that the galactose‐pentose pathway is only of minor importance in Ophiostoma as compared to the Leloir pathway.
Draft legislation indicates that new regulations may require mercury removal efficiencies as high as 90% from existing sources. With regulations rapidly approaching, it is important to concentrate ...efforts on the most mature retrofit control technologies. Injection of dry sorbents such as powdered activated carbon (PAC) into the flue gas and further collection of the sorbent by ESPs and fabric filters is commonly used in municipal waste incinerators for mercury control and represents the most mature and potentially most cost-effective control technology for power plants. Under a DOE/NETL cooperative agreement, ADA-ES is working in partnership with several other companies on a field evaluation program of sorbent injection upstream of existing particulate control devices for mercury control. Gaston Unit 3 was chosen as the first test site because COmpact Hybrid PArticulate Collector (COHPAC) represents a cost-effective retrofit option for utilities with electrostatic precipitators (ESP). COHPAC is an EPRI patented concept that places a higher than normal air-to-cloth ratio baghouse downstream of an existing ESP to improve overall particulate collection efficiency. Results of this test are presented.
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