156 research outputs found
Cooperative Regulation of the Activity of Factor Xa within Prothrombinase by Discrete Amino Acid Regions from Factor Va Heavy Chain†
ABSTRACT: The prothrombinase complex catalyzes the activation of prothrombin to R-thrombin. We have repetitively shown that amino acid region 695DYDY698 from the COOH terminus of the heavy chain of factor Va regulates the rate of cleavage of prothrombin at Arg271 by prothrombinase. We have also recently demonstrated that amino acid region 334DY335 is required for the optimal activity of prothrombinase. To assess the effect of these six amino acid residues on cofactor activity, we created recombinant factor Va molecules combining mutations at amino acid regions 334–335 an
1993 Progress Reports
The 1993 Progress Reports which contain Blueberry Tax Supported Weed Management and Pruning Project Reports, and CSRS Supported Weed Management and Pruning Project Reports, pertain to and report on research conducted in 1992. They were prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include:
Progress Reports
1. Effects of Irrigation on Low bush Blueberry Yield and Quality
2. Economics of Investing in Irrigation for Lowbush Blueberries
3. Diammonium Phosphate Study
4. Phosphorus Dose/Response Curve
5. Winter Injury Protection by Potassium
6. Multiple Cropping of Wild Stands
7. Effect of Boron on Lowbush Blueberry Fruit Set and Yield
8.Determination of Pesticide Residue Levels in Freshly Harvested and Processed Lowbush Blueberries
9. Effects of Calcium Salts and Citric Acids on the Quality of Canned Lowbush Blueberries- missing
10. Investigation of PreProcess Changes- missing
11. The Effect of Fertilization and Irrigation on Blueberry Fruit Control - missing
12. Pollination Ecology of Lowbush Blueberry in Maine
13. Control of Secondary Blueberry Pests
14. Control of Blueberry Maggot
15. Biology and Action Thresholds of Secondary Blueberry Pests
16. Cold-Hardiness of Native Lowbush Blueberries
17. Design, Fabrication, and Testing of an Experimental Sterilizer for Blueberry Fields
18. Canned Product Quality - Heat Resistant Molds
19. Sanitation for Disease Control
Blueberry Tax Supported Weed Management and Pruning Project Reports
20. Evaluation of Postemergence Applications of Tribenuron Methyl for Bunchberry Control
21. Comparison of Poast and Select for Suppression of Bunchgrass
22. Effect of Time of Fall Pruning on Growth and Productivity of Blueberries. and Evaluation of Infrared Burner to Prune Blueberries
23. Evaluation of Velpar impregnated DAP for weed control
24. Thresholds of Dogbane and Bracken Fern for Mechanical and Chemical Control in Lowbush Blueberry Fields
25. Effect of Time and Rate of Application of Clopyralid for Control of Vetch in Lowbush Blueberries
26. Hexazinone Ground Water Survey
27. Composting Blueberry Processing Waste
28. Hexazinone Movement in a Blueberry Soil in Maine
CSRS Supported Weed Management and Pruning Project Reports
29. Evaluation of the Suitability of Remote Sensing to Evaluate Plant Cover in Lowbush Blueberry Fields
30. Obstruction Removal in Lowbush Blueberry Fields
31. Evaluation of Pressurized Rope Wick Wick Master Wiper for Treating Weeds Growing Above Lowbush Blueberries
32. Evaluation of Infrared Burner for Weed Control
33. Blueberry Extension Education Program Base
Miscellaneous
34. Comparison of N, NP, and NPK Fertilizers to Correct Nitrogen and Phosphorus Deficienc
1992 Blueberry Research Progress Reports
The 1992 Blueberry Research Progress Reports pertain to and report on research conducted in 1991, and were prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include:
1992 CSRS Progress Reports:
1. Investigation of Groundwater Resources
2. Sprinkler Irrigation
3. Investigation of Preprocess Changes Leading to Berry Spoilage
4. Effect of Fertilization and Irrigation on Blueberry Quality
5. Effects of Calcium Salts and Citric Acid on Quality of Canned Lowbush Blueberries
6. Pollination of Lowbush Blueberry by Native Bees
7. Application of Heat for Controlling Insects
8. Investigations of Lowbush Blueberry Fruit Bud Cold-Hardiness
9. Steam Sterilization in Lowbush Blueberry Fields
10. Heat-Tolerant Molds
11. Vacuum Sanitation for Disease Control
12. Evaluation of Infrared Burner for Weed Control
13. Evaluation and Modification of Commercial Herbicide Wipers
14. Evaluation of Remote Sensing to Estimate Plant Cover in Lowbush Blueberry Fields
15. Comparison of Three Mechanical Blueberry Harvesters vs. Hand Raking
Advisory Committee Research Reports:
16. Biology and action thresholds of secondary blueberry insects
17. Control of secondary blueberry pests
18. Control of blueberry maggot
19. Effects of calcium salts and citric acid on the quality of canned lowbush blueberries
20. The effects of postharvest handling on the dietary fiber and ellagic acid content of lowbush blueberries
21. Investigation of preprocessing changes that could lead to development of simple and inexpensive method to measure preprocessing berry spoilage
22. Determination of pesticide residue levels in fresh and processed lowbush blueberries
23. Vacuum sanitation for disease control
24. Heat-tolerant molds
25. Seedling pruning study
26. Effect of time and rate of application of Clopyralid for control of Vetch in lowbush blueberries
27. Evaluation and modification of commercial herbicide wipers
28. Effect of time of application and formulation of Hexazinone (Velpar) on Blueberry and Bunchberry
29. Evaluation of postemergence applications of Tribenuron Methyl for Bunchberry control
30. Thresholds of Dogbane and Bracken Fern by mechanical and chemical control in lowbush blueberry fields
31. Evaluation of the suitability of remote sensing to evaluate plant cover in lowbush blueberry fields
32. Evalution of infrared burner for weed control
33. Effect of time of fall pruning on growth and productivity of blueberry and evaluation of infrared burner to prune blueberries
34. Effect of Boron on lowbush blueberry fruit set and yield
35. Winter injury protection by potassium
36. Multiple cropping of wild stands
37. Nitrogen-Phosphorus study
38. Phosphorus dose/response curve
39. Investigations of lowbush blueberry fruit bud cold-hardines
Maine Blueberry Advisory Committee Research Report
The 1990 edition of the Maine Blueberry Advisory Committee Research Reports was prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers with the Maine Agricultural Experiment Station and Maine Cooperative Extension Service at the University of Maine, Orono. Projects in this report include:
1. Biology and action thresholds of secondary blueberry pests
2. Control of blueberry maggot
3. Control of secondary blueberry pests
4. Application of steam as a method of controlling secondary pest insects on lowbush blueberry: a feasibility study
5. Pollination of the lowbush blueberry by native bees
6. Nitrogen-phosphorus study
7. Potassium study
8. Multiple cropping of wild stands
9. Phosphorus dose/response curve
10. Improvement in the color and texture of the canned blueberry
11. The effect of fertilization and irrigation on blueberry fruit quality
12. Investigation of preprocess changes (chemical, microbiological, and/or physical) that could lead to the development of a simple and inexpensive method to measure preprocess berry spoilage
13. The effect of postharvest handling on the dietary fiber and ellagic acid content of lowbush blueberries
14. Determination of pesticide residue levels in freshly harvested and processed lowbush blueberries
15. Evaluation of Defoliating Diseases
16. Vacuum Sanitation for Disease Control
17. Evaluation and modification of commercial herbicide applications
18. Evaluation of the suitability of remote sensing to evaluate plant cover in lowbush blueberry fields
19. Evaluation of Sethoxydin (POAST) in lowbush blueberry fields
20. Seedling pruning study
21. Evaluation of norflurazon (SOLICAM) with or without hexazinone (VELPAR) for bunchberry control
22. Selective wiper and mechanical control of dogbane and bracken fern
23. Evaluation of norflurazon (SOLICAM) in fall vs spring for oatgrass control
24. Evaluation of sulfonyl urea herbicides for bunchberry control
25. Evaluation of postemergence applications of DPX-L5300 for bunchberry control
26. Effect of time of application and formulation of hexazinone (VELPAR) on blueberry and bunchberry
27. Investigations of lowbush blueberry fruit-bud cold hardiness
28. The economics of investing in irrigation for lowbush blueberries
29. Effects of irrigation on lowbush blueberry yield and quality
30. Groundwater and surface water development for blueberry irrigation
31. Design, fabrication and testing of an experimental sterilizer for blueberry field
1993-94 Progress Report
The 1993 edition of the Progress Reports was prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include:
1. Effects of irrigation on lowbush blueberry yield and quality
2. The Economics of investigating irrigation for lowbush blueberries
3. Phosphorus dose/response curve
4. Winter injury protection by potassium
5. Multiple cropping of wild stands
6. Effect of Boron and Calcium on lowbush blueberry fruit set and yield
7. Comparison of N, NP, and NPK fertilizers to correct nitrogen and phosphorus deficiency
8. Determination of pesticide residue levels in freshly harvested and processed lowbush blueberries
9. Effects of calcium salts and citric acid on the quality of canned lowbush blueberries
10. Investigation of preprocess changes (chemical, microbiological, and/or physical) that can lead to the development of a simple and inexpensive method to measure preprocess berry spoilage
11. The effect of fertilization and irrigation in blueberry fruit quality
12. Pollination Ecology of lowbush blueberry in Maine
13. Current importance of insects in lowbush blueberry fields
14. Application of heat as a method of controlling secondary pest insects on lowbush blueberry: a feasibility study
15. Control of blueberry maggot
16. Control of secondary blueberry pest insects
17. Biology and action thresholds of secondary blueberry pest insects
18. Cold-hardiness of native lowbush blueberry
19. Design, fabrication, and testing of an experimental sterilizer for blueberry fields
20. Canned Product Quality--Heat-resistant molds
21. Sanitation for disease control
22. Evaluation of Velpar® impregnated DAP and Pronone® for weed control
23. Evaluation of postemergence applications of tribenuron methyl for bunchberry control
24. Evaluation of postemergence applications of a tank mix of tribenuron methyl and hexazinone for bunchberry control
25. Thresholds of dogbane and bracken fem by mechanical and chemical control in lowbush blueberry fields
26. Effect of time of application of clopyralid for control of vetch and effect on flowering in lowbush blueberries
27. Effect of time of fall pruning on growth and productivity of blueberries and evaluation of infrared burner to prune blueberries
28. Evaluation of infrared burner for selective seedling weed control
29. Evaluation of pressurized rope wick Wick Master wiper for treating weeds growing above lowbush blueberries
30. Blueberry Extension Education Program Base
31. Blueberry ICM program for Hancock County
32. Composting blueberry processing waste
33. Hexazinone ground water survey
34. Investigations of Lowbush Blueberry Fruit bud Cold-hardiness
35. Design, Fabrication, and Testing of an Experimental Sterilizer for Blueberry Field
Recipient and donor thrombophilia and the risk of portal venous thrombosis and hepatic artery thrombosis in liver recipients
<p>Abstract</p> <p>Background</p> <p>Vascular complications, such as HAT, are an important cause of graft loss and recipient mortality. We aimed to characterize post-transplant thrombotic events in a cohort of liver transplant recipients, and identify independent risk factors for these complications.</p> <p>Methods</p> <p>We conducted a thrombophilic study of 293 orthotopic liver transplants performed in the Digestive Surgery Department of the 12 de Octubre Hospital (Madrid, Spain) between January 2001 and December 2006.</p> <p>Results</p> <p>The most frequent post-transplant thrombotic events were HAT (9%) and PVT (1.7%). The one variable associated with post-transplant thrombotic event was a high fibrinogen level in the global cohort of liver transplantation. But toxicity as event post-OLT has been associated with post-transplant thrombotic event in the retrospective group and high fibrinogen level and low protein C levels were associated post-transplant thrombotic event in the prospective group. Liver disease relapse (HR 6.609, p < 0.001), high levels of FVIII (HR 1.008, p = 0.019)) and low levels of antithrombin (HR 0.946, p < 0.001) were associated with poor overall survival (OS).</p> <p>In conclusion, high fibrinogen and decreased protein C levels were associated with allograft thrombosis. Further studies are required in order to assess the clinical relevance of these parameters in prospective studies and to study the effect of anticoagulation prophylaxis in this group of risk.</p
The Enhancing Effects of the Light Chain on Heavy Chain Secretion in Split Delivery of Factor VIII Gene
Coagulation factor VIII (FVIII) is secreted as a heterodimer consisting of a heavy chain (HC) and a light chain (LC), which can be expressed independently and reassociate with recovery of biological activity. Because of the size limitation of adeno-associated virus (AAV) vectors, a strategy for delivering the HC and LC separately has been developed. However, the FVIII HC is secreted 10–100-fold less efficiently than the LC. In this study, we demonstrated that the F309S mutation and enhanced B-domain glycosylations alone are not sufficient to improve FVIII HC secretion, which suggested a role of the FVIII LC in regulating HC secretion. To characterize this role of the FVIII LC, we compared FVIII HC secretion with and without the LC via post-translational protein trans-splicing. As demonstrated in vitro, ligation of the LC to the HC significantly increased HC secretion. Such HC secretion increases were also confirmed in vivo by hydrodynamic injection of FVIII intein plasmids into hemophilia A mice. Moreover, similar enhancement of HC secretion can also be observed when the LC is supplied in trans, which is probably due to the spontaneous association of the HC and the LC in the secretion pathway. In sum, enhancing the secretion of the FVIII HC polypeptide may require the proper association of the FVIII LC polypeptide in cis or in trans. These results may be helpful in designing new strategies to improve FVIII gene delivery
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