Poly-lactic acid and agarose gelatin play an active role in the recovery of spinal cord injury

Objective To investigate the role of poly-lactic acid and agarose gelatin in promoting the functional recovery of the injured spinal cord. Methods Poly-lactic acid ( PLA) or agarose was embedded in the space between two stumps of the hemisectioned spinal cord. Immunohistochemistry was used to show astroglia proliferation and the infiltration of RhoA-positive cells. Locomotor activity recovery was evaluated by testing the function of hindlimbs. Results Astrogli-as and RhoA labeled non-neuronal cells accumulated in the area adjacent to the implant, while the number of RhoA-positive cells was decreased dramatically in the absence of implant. Animals implanted with agarose gelatin recovered more quickly than those with PLA, concomitant with a higher survival rate of the neurons. Conclusion Both PLA and agarose gelatin benefited the recovery of spinal cord after injury by providing a scaffold for astroglia processes. Modulation of the rigidity, pore size and inner structure of PLA and agarose gelatin might make these biodegradable materials more effective in the regeneration of the central nervous system (CNS).     

Agilent 2100 Bioanalyzer在基因差异表达研究中的应用

目的观察Agilent 2100 Bioanalyzer 芯片分析系统(以下简称Bioanalyzer)在基因差异表达研究中的应用。方法应用限制性显示技术分别从正常和热休克处理后的酿酒酵母细胞中分离出cDNA片段,然后再用Bioanalyzer和传统的琼脂糖凝胶电泳技术对RD-PCR产物进行检测分析。结果Bioanalyzer能更快速、敏感地分离和显示差异表达的基因片段,并且通过对差异片段进行定量比较,发现了数个表达有明显差异的基因片段。结论Bioanalyzer在基因差异表达研究中具有重要的应用价值。     

Agarose cell block: innovated technique for the processing of urine cytology for electron microscopy examination

Easy manipulation and preservation of cells in suspension through the different steps of sample processing for electron microscopy examination is essential for proper diagnosis. The author used agarose gel as an embedding media for processing cells in suspension for electron microscopic examination. The AgarCyto cell block procedure of Kerstens et al. (J Histochem Cytochem. 2000; 48: 709—718) was used to begin electron microscopic processing of exfoliated urothelial cells in voided urine or cells in suspension. Processing of agarose cell block simultaneously for light and electron microscopic examination represents a great advantage offered by this innovated technique.     

Growth and adipogenic differentiation of mesenchymal stromal bone marrow cells during culturing in 3D macroporous agarose cryogel sponges

We studied the possibility of population of macroporous agarose cryogel sponges by mesenchymal stromal bone marrow cells with their subsequent adipogenic differentiation. After 7-day culturing of mesenchymal stromal cells in agarose cryogel, the level of cell proliferation was 35%. After 3-week culturing in a medium inducing adipogenesis we observed accumulation of intracellular neutral lipids positively stained with Oil Red O. These findings can be used for the development of bioengineering constructions of the adipose tissue on the basis of spongy carriers. Translated from Kletochnye Tehnologii v Biologii i Medicine, No. 3, pp. 141–144, August, 2008     

琼脂糖等电聚焦法分离碱性磷酸酶同工酶在肿瘤诊断中的应用

目的：探讨碱性磷酸酶（ALP）同工酶在肿瘤诊断中的应用。方法：采用神经氨酸苷酶对正常人及患者血清中ALP同工酶进行处理后进行琼脂糖等电聚焦。结果：121例肿瘤患者中的92例有一等电点为6．2的区带,其阳性率为76％。结论：琼脂糖等电聚焦法分离ALP同工酶在肿瘤诊断中具有一定价值。     

二氧化硅法纯化琼脂糖凝胶中的DNA

利用二氧化硅特异地吸附核素的特性，建立了从琼脂糖凝胶中回收ＤＮＡ的方法。结果表明本方法对１３００￣３５００ｂｐ的ＤＮＡ回收效果较好，回收效率达６０％￣７０％，１００￣１５００ｂｐ，３５００￣５０００ｂｐ的ＤＮＡ亦能被有效地回收。通过对回收ＤＮＡ的酶切，连接等实验，证实了所回收的ＤＮＡ片段能够满足进一步的实验要求。该方法简单，快捷，经济，适用，值得推广。     

长沙地区汉族人群红细胞EsD和PGM1的分布研究

本文采用琼脂糖、水解淀粉混合凝胶电泳法同时分析血液EsD、PGM1二种酶型。调查了这二种酶的表型分布和基因频率及其识别能力 ,并与不同地区、不同国家和不同民族进行比较研究。此法可用于个人识别和亲权鉴定     

螺旋藻多糖的琼脂糖凝胶电泳鉴别

目的用琼脂糖凝胶电泳对螺旋藻多糖进行定性鉴别。方法利用螺旋藻多糖与肝素、硫酸软骨素、标准硫酸化的葡聚糖之间电荷密度及分子量的差异 ,在巴比妥缓冲液中进行琼脂糖凝胶电泳。结果根据电泳迁移率 ,可明显区分螺旋藻多糖与其他多糖。结论该法重现性较好 ,操作简单 ,可用于螺旋藻多糖的定性鉴别     

MTT肿瘤药敏试验中培养基的选择

目的考察RPMI1640双琼脂培养基(R)对肿瘤细胞培养的选择性,选择适合的MTT法培养基。方法用R和肿瘤细胞选择性培养基(completeassaymedium,CAM)分别进行乳腺、肠、胃癌的MTT药敏试验。结果所试的3个癌种、20个药品总体来说在两种培养基中抑制率无统计学差异(P>0.05),单个药敏在乳腺癌中长春新碱、长春地辛和吡柔比星的CAM培养抑制率大于R培养(P<0.05),在肠、胃癌中无统计学差异。结论R培养肿瘤细胞的选择性和CAM相当,但鉴于R抑制成纤维细胞能力相对比CAM弱,R可能更适合含纤维细胞较少的癌种。     

A New Biotin Labeling and High-Molecular-Weight RNA Northern Method and Its Application in Viral RNA Detection

Viruses cause severe crop losses. Studying the interaction between viruses and plants is very important for development of control measures. Northern blot is a well-accepted but very challenging technique to monitor the infection of viruses. Here, we modified the high-molecular-weight (hmw)RNA Northern blot experiment process, utilizing vertical electrophoresis to separate the RNA with denatured agarose gel. This protocol is compatible with regular equipment for Western blots and small RNA Northern blots and requires less input of total RNA. A new method to label the probe with biotin was also developed, which requires commonly used T4 DNA polymerase and detects viral RNA with high sensitivity. These new protocols made hmwRNA Northern blot cost-effective and easy-to-operate, very suitable for studying virus–host interactions.