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Post-fracture Stimulation of in Vitro Osteogenesis Is Not Systemic
Dutra, Timothy F.,Bernard, George W. Korean Academy of Oral Biology and the UCLA Dental 1998 International Journal of Oral Biology Vol.23 No.4
Locally active post-fracture stimulation of in vitro osteogenesis was observed in this laboratory by Tibone and Bernard (1982). They found that rabbit femoral bone marrow showed a significant increase in the number of in vitro osteogenic colonies when collected 24 hours after antecedent fracture, compared to marrow from unfractured controls. Using the same tissue culture methods for counting bone colonies as a bioassay, we compared bone colonies from marrow cells obtained before and after surgical fracture of the contralateral fenur and found no significant difference in number of bone colonies formed. Comparing these results with those of Tibone and Bernard (1982), our conclusion is that a fracture causes local stimulation of the osteogenic cells of marrow, which is not manifested systemically.
( Bernard Baiden ),( Seong-gu Hong ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-
This experiment is being conducted to investigate the reaction effects and syngas compositions when steam is used as the gasification agent from a biomass (charcoal) fuel source in a batch-type downdraft gasifier. The aim is to find out the influence of steam and/or air on the composition of syngas and reaction temperatures, calorific values and cold gas efficiencies in a charcoal gasification. The main experimental setup consists of a gasifier, cooling system, gas cleaning filter medium and air and steam supply equipment. Thermocouples are installed at vantage points on gasifier to measure the temperature profile and gas analyser also installed to measure the syngas composition (CO2, H2, CO and CH4). Steam supply for the gasification are supplied intermittently at 10s, 20s 30s, 40s, 50s, 60s in every 10 minutes interval. In the results it is expected that, syngas which is basically hydrogen (H2) and carbon-monoxide (CO) to increase. Because steam have hydrogen and oxygen molecules, therefore the hydrogen gas (H2) is expected to increase and carbon-monoxide decrease. The extent to which the increase or decrease would occur will depend on the length of steam input. Again, steam supply is also expected to reduce the reaction temperatures. If the hydrogen is increased as anticipated, then the calorific values and cold gas efficiency would increase. This study would show that steam supplied as gasification agent increases syngas production, calorific value, gas efficiency and decreases reaction temperatures. These findings are good steps in finding alternative clean energy source utilization. Charcoal biomass produce relatively no tar and cleaning is very easy. It is therefore recommended as a good gasification fuel source.
Bernard Ouma Alunda,루크오두어르오티에노,Melody CHEPKOECH,변지수,이영중 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.2
The optical beam de ection sensor remains the most popular force detection method used in atomic force microscopy. With the recent development of short cantilevers, a means for measuring small de ections at high frequencies has become a challenge. Minimizing the noise level of the readout electronics without signicantly limiting the detection bandwidth still remains a challenge. In this work, a recently proposed trans-linear readout circuit-based technique, in which necessary analog arithmetics are done in the current domain instead of the voltage domain, is compared to a more traditional trans-impedance readout circuit-based topology. Our developed trans-impedance readout circuit recorded a noise oor of 9:48 1013 V2 Hz1 compared to 1:41 1011 V2 Hz1 for the trans-linear readout circuit. Also, the measured 3 dB bandwidth of 11 MHz for the transimpedance readout circuit was slightly higher than the 10 MHz for the trans-linear readout circuit. Trans-impedance readout circuits, with proper circuit design considerations and careful selection of electronic parts, still remain competitive for use in high-speed operations in atomic force microscopy.