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RISS 인기검색어
- 검색키워드
- 저자 : Stoecker, Barbara J. (검색결과 6 건)
- 무료
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An Economic Evaluation of Swine Waste Management Systems under Environmental Regulations
Kim, Chang-Gil,Stoecker, Arthur,Williams, Joseph 한국농업경제학회 2002 農業經濟硏究 Vol.43 No.4
The objectives of this study are to evaluate the economics of alternative swine waste management systems and to determine the optimal waste management strategy that maximized a representative swine producer's profitability from production while managing swine waste in a manner that meets environmental regulations. The objectives are accomplished through the use of a mixed integer programming model. The analytical model is to determine the most profitable swine production and waste management system for representative producers in Texas and Seminole counties in Oklahoma. The major finding is that there is no single best or optimal waste management system for all sizes and types of swine operations. In general, and use of the lagoon to store and the use of an irrigation system to spread swine waste require less energy and labor and is more cost effective than other systems such as tank-hauling, pit-hauling, or lagoon-hauling systems.
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MTA 유사체의 Purine Metabolism 에의 영향
최혜선,J . D . Stoecker ( Hye Seon Choi,J . D . Stoeckler ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.1
5`-Deoxy-5`-methylthioadenosine (MTA) which is related to polyamine synthesis, is rapidly converted to 5-methylthioribose 1-phosphate (MTR-1-P) and adenine by the reaction of MTA phosphorylase (MTAPase) (Savarese et al., 1981). MTA analogs in which the ribose moiety was replaced have demonstrated to be cytotoxic (Savarese et al., 1984; Ferro et al., 1982). These results indicated that the common product, 5-modified sugar phosphate, exerted cytotoxic effect against several tumor cells. L5178Y mouse lymphoblastic leukemia cells were treated with 5`-modified adenosines, MTA, 5`-deoxy-5`-isobutylthioadenosine (SIBA), 5`-deoxy-5`-iodoadenosine (5`-IAdo) and 5`-deoxyadenosine (5`-dAdo). The phosphorolysis of 100 μM of 5`-modified nucleosides measured in intact L5178Y cells agreed well with the relative V_m of MTAPase from Sarcoma 180 cells determined by Savarese et al. (1983). 5`-IAdo showed extra inhibition of 5-phosphoribosyl 1-pyrophosphate (PRPP) synthesis at high concentration, but the inhibition by 5`-dAdo, MTA and SIBA could be due to adenine released from 5`-substituted adenosines. 5`-Modified adenosines caused greater inhibition of purine synthesis de novo than the same concentration of adenine as were generated from the 5`-substituted adenosines. No inhibition of purine salvage pathway was observed. 5`-IAdo was most cytotoxic and inhibited purine metabolism to the greatest extent in L5178Y cells. In the HL-60 human promyelocytic leukemia cells and HL-60, APRT-deficient mutant cells, the effects of 5`-IAdo on purine and pyrimidine metabolism were measured. 5`-IAdo had no significant effects on PRPP accumulation, purine synthesis de novo and purine salvage pathway.
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Feeding Orange Pulp Improved Bone Quality in a Rat Model of Male Osteoporosis
Rori Morrow,Farzad Deyhim,Barbara J. Stoecker,Bhimanagouda S. Patil 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.2
Oxidative stress and inflammation have been linked to bone loss. We evaluated the effects of feeding orange pulp (OP), a source of vitamin C and flavonoids, on bone quality in a rat model of male osteoporosis. One-year-old retired breeder rats (n = 43) were orchidectomized (ORX) or sham-operated (SHAM). Three days postsurgery, ORX rats were randomly assigned to treatments: ORX or ORX with 2.5% OP, 5% OP, or 10% OP. Diets were isonitrogenous, isocaloric, modified AIN-93M diets with equal fiber content. All ORX rats were fed for 4 months to the mean food intake of the SHAM group. At the end of the study blood, urine and bone samples were collected. Plasma antioxidant capacity and urinary deoxypyridinoline (DPD) were determined. Bone density, structure, and strength were assessed using dual energy X-ray absorptiometry, microcomputed tomography, and finite element analyses. ORX decreased (P < .05) antioxidant status, while OP as low as 2.5% maintained the antioxidant capacity of ORX rats comparable to that of the SHAM group. Cortical thickness at the tibial midshaft was significantly decreased by ORX and increased by OP, and urinary DPD was significantly increased by ORX and decreased by OP. In fourth lumbar trabecular cores, ORX rats had significantly reduced bone volume fraction, connectivity density, and trabecular number and increased trabecular separation. OP significantly increased bone volume fraction and trabecular number and decreased trabecular separation in ORX rats. Improvements due to OP in microarchitectural properties of vertebral bones and in cortical thickness of long bones were subtle but significant. The consistently negative impacts of ORX on bone density, structure, and strength parameters confirm the previously reported importance of testosterone for bone.
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Feeding Orange Pulp Improved Bone Quality in a Rat Model of Male Osteoporosis
Morrow, Rori,Deyhim, Farzad,Patil, Bhimanagouda S.,Stoecker, Barbara J. The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.2
Oxidative stress and inflammation have been linked to bone loss. We evaluated the effects of feeding orange pulp (OP), a source of vitamin C and flavonoids, on bone quality in a rat model of male osteoporosis. One-year-old retired breeder rats (n = 43) were orchidectomized (ORX) or sham-operated (SHAM). Three days postsurgery, ORX rats were randomly assigned to treatments: ORX or ORX with 2.5% OP, 5% OP, or 10% OP. Diets were isonitrogenous, isocaloric, modified AIN-93M diets with equal fiber content. All ORX rats were fed for 4 months to the mean food intake of the SHAM group. At the end of the study blood, urine and bone samples were collected. Plasma antioxidant capacity and urinary deoxypyridinoline (DPD) were determined. Bone density, structure, and strength were assessed using dual energy X-ray absorptiometry, microcomputed tomography, and finite element analyses. ORX decreased (P < .05) antioxidant status, while OP as low as 2.5% maintained the antioxidant capacity of ORX rats comparable to that of the SHAM group. Cortical thickness at the tibial midshaft was significantly decreased by ORX and increased by OP, and urinary DPD was significantly increased by ORX and decreased by OP. In fourth lumbar trabecular cores, ORX rats had significantly reduced bone volume fraction, connectivity density, and trabecular number and increased trabecular separation. OP significantly increased bone volume fraction and trabecular number and decreased trabecular separation in ORX rats. Improvements due to OP in microarchitectural properties of vertebral bones and in cortical thickness of long bones were subtle but significant. The consistently negative impacts of ORX on bone density, structure, and strength parameters confirm the previously reported importance of testosterone for bone.
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