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Villeneuve PE, Wenger KS, Thompson BG, Kedar T, Dunlop EH. Development of a CELSS bioreactor: oxygen transfer and micromixing in parabolic flight. ADVANCES IN SPACE RESEARCH : THE OFFICIAL JOURNAL OF THE COMMITTEE ON SPACE RESEARCH (COSPAR) 1994; 14:75-78. [PMID: 11540221 DOI: 10.1016/0273-1177(94)90282-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The gas exchange portion of a phase-separated loop bioreactor was tested with respect to oxygen mass transfer and micromixing in accelerations of 0.01g, 1g, and 2g. A plot of the overall mass transfer coefficient versus gravity indicates the rate of oxygen transfer does not change as a function of acceleration. Also, it was determined that the micromixing did not exhibit significant changes in the various gravitational fields. These observations indicate the loop bioreactor should function independent of acceleration.
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Golfinos JG, Thompson BG, Zabramski JM, Spetzler RF. Are the calcium antagonists really useful in cerebral aneurysmal surgery? A retrospective study. Neurosurgery 1994; 35:541-2. [PMID: 7800152 DOI: 10.1227/00006123-199409000-00037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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Thompson BG, Doppman JL, Oldfield EH. Treatment of cranial dural arteriovenous fistulae by interruption of leptomeningeal venous drainage. J Neurosurg 1994; 80:617-23. [PMID: 8151339 DOI: 10.3171/jns.1994.80.4.0617] [Citation(s) in RCA: 146] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Cranial dural arteriovenous fistulae (AVF's) of the tentorial incisura or the dura of the middle fossa have a much higher incidence of draining via leptomeningeal veins than do AVF's of the transverse-sigmoid sinuses or the cavernous sinus. Such a drainage pattern is associated with an increased incidence of intracranial hemorrhage and progressive focal neurological deficits. Patients with cranial dural AVF's often undergo surgical excision and/or endovascular embolization for elimination of the AVF. Since these lesions are frequently large and involve the skull base or adjacent dural sinuses, extensive surgery is often required. In contrast, spinal dural AVF's with only intradural venous drainage to the medullary venous system are treated successfully by simply interrupting the vein that drains the dural AVF as it enters the subarachnoid space. The authors identified a subgroup of patients with cranial dural AVF's in whom the AVF was drained only by leptomeningeal veins, and sought to establish whether simple interruption of the vein draining the blood from the AVF into the subarachnoid space is effective and lasting treatment in this subgroup of patients, as it is in patients with spinal dural AVF's. Four adult patients with symptomatic cranial dural AVF's (two petrotentorial, one middle fossa floor, and one posterior fossa base) were identified on arteriography as having fistulae that were supplied by the internal and/or external carotid arteries and drained only via leptomeningeal veins (two entered the petrosal vein, one a cerebellar hemispheric vein, and one a mesencephalic vein). All patients underwent interruption of the vein draining the dural AVF as it penetrated the dura to enter the subarachnoid space, and experienced neurological improvement after surgery. Repeat arteriography at 1 to 2 weeks (three patients), 3 months (3 patients), 12 to 15 months (three patients), and 4 years (two patients) revealed no residual AVF and no evidence of abnormal blood flow. Many cranial dural AVF's with leptomeningeal venous drainage (the type with the most aggressive behavior) are drained only by leptomeningeal veins. This subgroup of patients can be identified by selective arteriography and requires only interruption of the draining vein as it enters the subarachnoid space for successful, lasting elimination.
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Macaloney G, Hall JW, Rollins MJ, Draper I, Thompson BG, McNeil B. Monitoring biomass and glycerol in an Escherichia coli fermentation using near-infrared spectroscopy. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf00155422] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lu GZ, Gray MR, Thompson BG. Physical modeling of animal cell damage by hydrodynamic forces in suspension cultures. Biotechnol Bioeng 1992; 40:1277-81. [DOI: 10.1002/bit.260401018] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Namdev PK, Thompson BG, Ward DB, Gray MR. Effects of glucose fluctuations on synchrony in fed-batch fermentation of Saccharomyces cerevisiae. Biotechnol Prog 1992. [DOI: 10.1021/bp00018a005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bhalla M, Thompson BG, Harley RA, McLoud TC. Primary extraosseous pulmonary osteogenic sarcoma: CT findings. J Comput Assist Tomogr 1992; 16:974-6. [PMID: 1430451 DOI: 10.1097/00004728-199211000-00027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This is a report of a primary extraosseous osteogenic sarcoma of the lung. The patient presented with fever and productive cough. Chest radiography and CT showed a cavitary lesion with an air-fluid level. The lesion was treated as an abscess. Despite aggressive antibiotic therapy and drainage, the patient continued to deteriorate rapidly. At autopsy the lesion was found to be a primary extraosseous pulmonary osteogenic sarcoma.
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Namdev PK, Thompson BG, Gray MR. Effect of feed zone in fed-batch fermentations ofSaccharomyces cerevisiae. Biotechnol Bioeng 1992; 40:235-46. [DOI: 10.1002/bit.260400207] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yegneswaran PK, Gray MR, Thompson BG. Effect of dissolved oxygen control on growth and antibiotic production in Streptomyces clavuligerus fermentations. Biotechnol Prog 1991; 7:246-50. [PMID: 1367597 DOI: 10.1021/bp00009a008] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A proportional-integral control system was used to control dissolved oxygen in a fermentor at constant shear and mass transfer conditions. Growth and antibiotic production in Streptomyces clavuligerus were studied at different dissolved oxygen levels during the fermentation. Three protocols were employed: no-oxygen control to provide a base case, oxygen controlled to a preset saturation level throughout the fermentation, and oxygen controlled at a high level only during the growth phase. The last protocol was aimed at optimizing the consumption of oxygen. Lower specific growth rates and cephamycin C yields were obtained when dissolved oxygen was controlled at 50% throughout the fermentation, compared to the base case. A 2.4-fold increase in the final cephamycin yield was observed when dissolved oxygen was controlled at saturation levels during the growth phase, compared to the experiments without dissolved oxygen control. This enhancement in yield was independent of the dissolved oxygen (DO) level after exponential growth, in the range of 50-100% saturation. The most effective control strategy, therefore, was to control DO only during active growth when the biosynthetic enzymes were probably synthesized.
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Namdev PK, Yegneswaran PK, Gray MR, Thompson BG. Experimental simulation of large-scale bioreaetor environments using a Monte Carlo method. CAN J CHEM ENG 1991. [DOI: 10.1002/cjce.5450690216] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Yegneswaran PK, Gray MR, Thompson BG. Kinetics of CO2 hydration in fermentors: pH and pressure effects. Biotechnol Bioeng 1990; 36:92-6. [DOI: 10.1002/bit.260360112] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Thompson BG, Coffey RJ, Flickinger JC, Lunsford LD. Stereotactic radiosurgery of small intracranial tumors: neuropathological correlation in three patients. SURGICAL NEUROLOGY 1990; 33:96-104. [PMID: 2154869 DOI: 10.1016/0090-3019(90)90018-k] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The mechanism by which radiosurgery can stop the growth of some tumors is poorly understood, in part because postmortem neuropathological findings in patients have been reported only rarely. To define further the effects of radiosurgery, we present the correlation among clinical, neuroimaging, and neuropathological data in three patients with different intracranial tumors who died between 2 and 39 weeks after radiosurgery. The target volumes in two patients with malignant tumors showed sharply demarcated coagulative necrosis. In the third patient, who had a benign acoustic nerve tumor, neuropathological examination found intratumoral hemorrhage and cyst formation, but no necrosis. Radiosurgery appears to cause acute necrosis of malignant cells, although its effectiveness may be limited by the infiltrative nature of some tumors. In benign tumors, necrosis following radiosurgery is relatively delayed, and may not be required for growth arrest.
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Thompson BG. Controlled ecological life support systems (CELSS) in high pressure environments. ACTA ASTRONAUTICA 1989; 19:463-465. [PMID: 11541157 DOI: 10.1016/0094-5765(89)90112-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Future space habitats may be constructed in high pressure environments. The biological components of any controlled ecological life support systems (CELSS) used in these habitats will have to be able to grow and metabolize normally for the CELSS to operate.
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Thompson BG. The maximization of the productivity of aquatic plants for use in controlled ecological life support systems (CELSS). ACTA ASTRONAUTICA 1989; 19:269-273. [PMID: 11541161 DOI: 10.1016/0094-5765(89)90039-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Lemna minor (common duckweed) and a Wolffia sp. were grown in submerged growth systems. Submerged growth increased the productivity unit volume (P/UV) of the organisms and may allow these plants to be used in a controlled ecological life support system (CELSS).
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Thompson BG, Brooks WS. Gas bubble coalescence in reduced gravity conditions. ADVANCES IN SPACE RESEARCH : THE OFFICIAL JOURNAL OF THE COMMITTEE ON SPACE RESEARCH (COSPAR) 1989; 9:179-184. [PMID: 11537386 DOI: 10.1016/0273-1177(89)90043-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The effects of low gravity, as produced by a reduced gravity aircraft, the KC135, on the formation and coalescence of gas bubbles were examined over a range of gas-liquid ratios and with various medium constituents. These effects will influence design considerations of fermentors operating in reduced gravity conditions.
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Thompson BG. Effect of temporary localized operating conditions on fermentations ofSaccharomyces cerevisiae. Biotechnol Bioeng 1987; 29:786-8. [DOI: 10.1002/bit.260290622] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Delany DJ, Scatliff JH, Thompson BG. A multimodality projection console for the radiology conference room. Invest Radiol 1987; 22:336-7. [PMID: 3583654 DOI: 10.1097/00004424-198704000-00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A multimodality projection console for the radiology conference room is described. The configuration of the TV camera, view boxes, switches, and adjacent lectern allows better transmission and easier manipulation of images during consultation and lecture sessions with the faculty, and house officers.
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Thompson BG, Lake BH. The effect of radiation on the long term productivity of a plant based CELSS. ADVANCES IN SPACE RESEARCH : THE OFFICIAL JOURNAL OF THE COMMITTEE ON SPACE RESEARCH (COSPAR) 1987; 7:133-140. [PMID: 11537262 DOI: 10.1016/0273-1177(87)90044-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Mutations occur at a higher rate in space than under terrestrial conditions, primarily due to an increase in radiation levels. These mutations may effect the productivity of plants found in a controlled ecological life support system (CELSS). Computer simulations of plants with different ploidies, modes of reproduction, lethality thresholds, viability thresholds and susceptibilities to radiation induced mutations were performed under space normal and solar flare conditions. These simulations identified plant characteristics that would enable plants to retain high productivities over time in a CELSS.
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Thompson BG. Electrochemical ion control in batch cultures of Saccharomyces cerevisiae NCYC 1018. Biotechnol Bioeng 1986; 28:1884-8. [PMID: 18555307 DOI: 10.1002/bit.260281217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Thompson BG. Substrate concentration control by dialysis in fermentations ofEscherichia coli. Biotechnol Bioeng 1986; 28:1348-57. [DOI: 10.1002/bit.260280909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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46
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Kole MM, Thompson BG, Gerson DF, Senechal J. Control of nitrate concentration in fermentations of Corynebacterium glutamicum. Biotechnol Bioeng 1986; 28:659-62. [PMID: 18555376 DOI: 10.1002/bit.260280504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A nitrate control system has been devised for the maintenance of stable nitrate concentrations throughout fed-batch fermentations of Corynebacterium glutamicum. The feedback control system was based on the use of a nitrate-ion-selective electrode to directly monitor the nitrate levels in the fermentor and an automatic controller to activate a nitrate feed pump. The electrode which was used for controlling the nitrate level was stable through-out the fermentation period. The apparent maximum specific growth rate, biomass production, protein production, biomass yields on glucose and nitrate, and amino acid production were all optimal at approximately 50mM nitrate.
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Thompson BG, Ward D. Gas transfer in microgravity fermentations. ACTA ASTRONAUTICA 1986; 13:105-117. [PMID: 11542837 DOI: 10.1016/0094-5765(86)90041-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Fermentations performed under microgravity conditions may be used in future long duration space missions for recycling expendable life support materials. These fermentations will differ from similar fermentations performed at one gravity in the manner in which gas transfer in the fermentor is carried out.
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Thompson BG, Gerson DF. Electrochemical control of redox potential in batch cultures of Escherichia coli. Biotechnol Bioeng 1985; 27:1512-5. [DOI: 10.1002/bit.260271018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Staab EV, Perry JR, Brenton BC, Thompson BG, Parrish DM, Creasy JL, Yankaskas BC. Image communications. What is needed and why. APPLIED RADIOLOGY 1985; 14:19-20, 25-9. [PMID: 10280628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Better communications are essential in the new medical environment. Methods to make more efficient the throughput in an existing department, foster confidence of patients, and improve the communications and efficiency of referring physicians are needed. The most difficult and thus the driving component of the new communications environment is image transmission. Concepts of picture archiving and communications systems, or PACS, arising from digital technology make possible unique and ubiquitous solutions to image communications. Better quality control and improved interpretation throughout the system, including the offices of referring physicians, will be possible. Radiologists are in a position to mold this new medical industry.
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Thompson BG, Gerson DF. Electrochemical ph control ofSaccharomyces cerevisiae Batch cultures. Biotechnol Bioeng 1985; 27:214-6. [DOI: 10.1002/bit.260270218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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