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101.
102.
The intravertebral vacuum cleft: a sign of ischemic vertebral collapse 总被引:14,自引:0,他引:14
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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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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
109.
Kilavik BE Ponce-Alvarez A Trachel R Confais J Takerkart S Riehle A 《Cerebral cortex (New York, N.Y. : 1991)》2012,22(9):2148-2159
The local field potential (LFP) is a population measure, mainly reflecting local synaptic activity. Beta oscillations (12-40 Hz) occur in motor cortical LFPs, but their functional relevance remains controversial. Power modulation studies have related beta oscillations to a "resting" motor cortex, postural maintenance, attention, sensorimotor binding and planning. Frequency modulations were largely overlooked. We here describe context-related beta frequency modulations in motor cortical LFPs. Two monkeys performed a reaching task with 2 delays. The first delay demanded attention in time in expectation of the visual spatial cue, whereas the second delay involved visuomotor integration and movement preparation. The frequency in 2 beta bands (around 20 and 30 Hz) was systematically 2-5 Hz lower during cue expectancy than during visuomotor integration and preparation. Furthermore, the frequency was directionally selective during preparation, with about 3 Hz difference between preferred and nonpreferred directions. Direction decoding with frequency gave similar accuracy as with beta power, and decoding accuracy improved significantly when combining power and frequency, suggesting that frequency might provide an additional signal for brain-machine interfaces. In conclusion, multiple beta bands coexist in motor cortex, and frequency modulations within each band are as behaviorally meaningful as power modulations, reflecting the changing behavioral context and the movement direction during preparation. 相似文献
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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