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101.
The intravertebral vacuum cleft: a sign of ischemic vertebral collapse 总被引:14,自引:0,他引:14
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103.
Hisashi Okubo MD Michiaki Matsushita MD PhD Hirofumi Kamachi MD PhD Tomoaki Kawai MD Kazutaka Nishikawa Tetsuya Fujimoto Takanori Saito BE Satoru Todo MD PhD 《Journal of artificial organs》2001,4(4):331-335
Mixed liver cell spheroids from rats consisting of hepatocytes and nonparenchymal cells lose three-dimensional structure and
function when cultured on dishes. In order to maintain the configuration and function of the spheroids, we cultured them with
collagen gel in various conditions, such as on the surface of collagen gel (group 2), between two collagen gel layers (group
3), and within collagen gel (group 4). Spheroids cultured on a standard collagen-coated dish were used as controls (group
1). Culture was continued for 10 days. Phase-contrast microscopy revealed that the spheroids of group 1 lost their spheroidal
configuration and became a monolayer within 24 h. Group 2 spheroids also spread out to a monolayer, but thus occurred at 24
to 48h. In group 3, spheroid configuration was sustained until day 10, though slightly flattened. In group 4, the spheroid
configuration was well maintained throughout the culture period. Urea synthesis of the spheroids cultured with collagen gel
was significantly higher than in group 1 between days 1 and 3. Albumin synthesis of three experimental groups was also significantly
higher than that of group 1. Although three experimental groups showed no difference in urea synthesis, albumin production
by spheroids in groups 3 and 4 was better maintained than in group 2, even toward the end of the culture period. It is concluded
that mixed liver-cell spheroid culture within collagen gels showed better maintenance of their configuration and function. 相似文献
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107.
A 23-year-old woman with long-standing insulin dependent diabetes presented with necrobiosis lipoidica. She was particularly troubled by the telangiectatic element of the lesion and therefore underwent test treatment with the pulsed dye laser. At low fluences minimal therapeutic effect was achieved, and at higher fluences skin breakdown occurred. This resolved with conservative management. It would appear that caution is required when attempting to treat necrobiosis lipoidica with laser. 相似文献
108.
MG Hayes M Urbanek M-F Hivert LL Armstrong J Morrison C Guo LP Lowe DA Scheftner A Pluzhnikov DM Levine CP McHugh CM Ackerman L Bouchard D Brisson BT Layden D Mirel KF Doheny MV Leya RN Lown-Hecht AR Dyer BE Metzger TE Reddy NJ Cox WL Lowe Jr. for the HAPO Study Cooperative Research Group. 《Diabetes》2013,62(10):3641
109.
110.
Wai Lone Lim BEng PhD Yong Tian Chew PhD MEng BE Krishnan B Chandran PhD Hong Tong Low PhD MEng BEng Kok Yong Seng BEng 《Journal of artificial organs》2000,3(2):162-165
Cavitation bubble formation associated with mechanical valve closure has been investigated in vitro, and the region of bubble
formation has been correlated with large negative pressure transients. The region of cavitation bubbles forms in valve designs
where leaflets interact with seat stops. It has been postulated that the fluid is squeezed between the leaflet and the seat
stop and radially propelled at high velocities, resulting in further pressure reduction below the vapor pressure of fluid
and initiating cavitation bubble formation. We conducted in vitro experiments to visualize and detect the presence of squeeze-flow
phenomena associated with valve closure of mechanical heart valves. The closing dynamics were studied by simulating a single
closing event of the leaflet with the valve mounted at the mitral position. Squeeze flow was detected at the instant of valve
closure, when the valve leaflet interacts with the valve seat stop. The use of a high-speed video camera at 1000 frames per
second with strobe light at 16000 pulses per second enabled the visualization of cavitation bubbles and its radial motion
from the valve's seat stop due to the squeeze-flow effect. Vapor cavitation bubbles were observed to collapse within 0.5 ms
after inception. In mechanical valves without seat stops in the major orifice region, bubbles of duration longer than that
of the cavitation bubbles were observed. These microbubbles were present for 4 s before collapsing and are believed to be
air bubbles whose presence in vivo has been detected with ultrasound imaging. 相似文献