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首頁(yè)> 外文學(xué)位 >An in vitro study of the elastic property loss of poly(L-lactic acid), PLLA, filaments undergoing hydrolysis in tissue engineering applications.
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An in vitro study of the elastic property loss of poly(L-lactic acid), PLLA, filaments undergoing hydrolysis in tissue engineering applications.

機(jī)譯:在組織工程應(yīng)用中進(jìn)行水解的聚L-乳酸PLLA長(zhǎng)絲的彈性損失的體外研究。

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The objective of the investigation was to describe the elastic property loss in a stressed PLLA filament in a scaffold for soft tissue ingrowth undergoing hydrolysis. A tissue-engineered scaffold for the liver was the theoretical example. This was a construct located in the upper mid-abdomen region able to withstand the elastic forces associated with sitting, standing, and minimal activities. For this study, fibers were melt-spun from PLLA, aged according to ASTM F 1635-95, and sterilized with gamma irradiation. Samples were mechanically tested (ASTM D 3822-96 and ASTM D 1774-94). In addition, the changes in molecular weight were followed by intrinsic viscosity (ASTM D 2857-93).; In general, the longer that most samples were aged, the lower the molecular weight. The elastic recovery did not change significantly. The breaking tenacity remained stable at least for the time of this study. In the 5.0 DR sample, the crystallinity was low (26%). Gamma irradiation severely degraded the specimens (94% molecular weight loss). Therefore, the amount and location of the amorphous regions in the filament cross section is important in determining the rate of the degradation and the subsequent mechanical property loss.; While these define the minimal stresses on the filaments, more study on how strong the filaments are when bonded together in scaffold or fabric are required. Also, elastic and tensile testing of the samples while they are in the physiological soaking solution would keep the samples viable and as close to in vivo conditions as possible.
機(jī)譯:研究的目的是描述在經(jīng)受水解的軟組織向內(nèi)生長(zhǎng)的支架中,受應(yīng)力的PLLA絲的彈性損失。肝臟的組織工程支架是理論上的例子。這是位于上腹部中部區(qū)域的結(jié)構(gòu),能夠承受與坐,站立和最少活動(dòng)相關(guān)的彈力。在本研究中,纖維是從PLLA熔紡而成的,根據(jù)ASTM F 1635-95進(jìn)行時(shí)效處理,并用伽馬射線輻照滅菌。對(duì)樣品進(jìn)行機(jī)械測(cè)試(ASTM D 3822-96和ASTM D 1774-94)。另外,分子量變化后是特性粘度(ASTM D 2857-93)。通常,大多數(shù)樣品的老化時(shí)間越長(zhǎng),分子量越低。彈性回復(fù)沒有明顯變化。斷裂韌性至少在本研究期間保持穩(wěn)定。在5.0 D R 樣品中,結(jié)晶度低(26%)。伽瑪射線嚴(yán)重降解了樣品(94%的分子量損失)。因此,長(zhǎng)絲橫截面中非晶區(qū)域的數(shù)量和位置對(duì)于確定降解速率和隨后的機(jī)械性能損失很重要。盡管這些定義了細(xì)絲上的最小應(yīng)力,但需要進(jìn)一步研究當(dāng)在腳手架或織物中粘結(jié)在一起時(shí)細(xì)絲的強(qiáng)度。而且,在將樣品置于生理浸液中時(shí)進(jìn)行彈性和拉伸測(cè)試將使樣品保持活力,并盡可能接近體內(nèi)的條件。

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