Liposome-mediated transfer of vascular endothelial growth factor cDNA augments survival of random-pattern skin flaps in the rat.

Tissue engineering is an application for gene therapy that is in its infancy. We show that simple liposomal-mediated gene transfer could result in a potentially useful biological effect in the field of wound healing. cDNA encoding the 165 amino acid form of vascular endothelial growth factor complexed to commercially available liposomes was injected into rat skin 1 week before raising a random pattern 3 x 10 cm flap. The flap survival was enhanced by 14 percent, and was accomplished without accessing the arterial inflow of the territory. These results were statistically significant (p<0.002) and reproducible. No adverse effects were seen. Histological analysis of the angiogenesis localized much of the new vessel formation to the area around the hair follicles. Polymerase chain reaction amplification of extracted flap tissue confirmed the presence of the transgene.     

Analysis of the Surface Ozone During Summer and Autumn at a Coastal Site in East China

The levels and temporal variations of surface ozone at a coastal site in East China during summer and autumn were analyzed and the influences of meteorological parameters on ozone were investigated. An inland city was chosen as a comparison site. The main results and conclusions of this study are: (1) ozone pollution, with a maximum 1 h concentration of 150.98 ppbv, was severe during summer and autumn at the coastal site; (2) the ozone level was obviously higher at the coastal site than that at the inland site in September; (3) besides temperature and solar radiation, sea-land breeze circulation is an important factor influencing the ozone level at the coastal site, and sea breeze often induce high ozone levels (the average ozone concentration for sea breeze was about 13 ppbv higher than that for land breeze).     

Efficient high-frequency body coil for high-field MRI.

The use of body coils is favored for homogeneous excitation, and such coils are often paired with surface coils or arrays for sensitive reception in many MRI applications. While the body coil's physical size and resultant electrical length make this circuit difficult to design for any field strength, recent efforts to build efficient body coils for applications at 3T and above have been especially challenging. To meet this challenge, we developed an efficient new transverse electromagnetic (TEM) body coil and demonstrated its use in human studies at field strengths up to 4 T. Head, body, and breast images were acquired within peak power constraints of <8 kW. Bench studies indicate that these body coils are feasible to 8 T. RF shimming was used to remove a high-field-related cardiac imaging artifact in these preliminary studies. P41RR13230     

复方壳多糖组织工程皮肤的组织学特性

目的评价制备的复方壳多糖组织工程皮肤在组织学方面的特性，为其修复皮肤缺损创面提供实验依据。方法通过苏木精-伊红（HE）染色、高碘酸-希夫（PAS）染色、免疫组织化学染色及电镜，观察组织工程皮肤的组织学特征，包括表皮、真皮及两者的连接结构基底膜。结果制备的复方壳多糖组织工程皮肤表皮细胞增殖活跃，分层分化良好，厚约150μm，真皮层细胞生长正常，排列有序。PAS染色示真表皮间有均匀红染的条带出现，免疫组织化学染色结果显示Ⅳ型胶原、Ⅶ型胶原、层黏蛋白反应阳性，在电镜下可见角质形成细胞间大量桥粒，基底层内侧较多半桥粒，与机体皮肤结构相似。结论复方壳多糖组织工程皮肤组织结构良好，符合新型皮肤替代物在治疗皮肤缺损时的组织学要求。     

提高与保证生物化学教学质量的探讨

随着生物化学和分子生物学的快速发展,生物化学的理论和技术被广泛应用于各种研究领域.因此不断提高教师的业务素质、采用先进的教学手段和教学模式、改革生物化学的实验教学,是提高与保证生物化学教学质量的前提,也是衔接后期研究生教学的重要环节.     

十二指肠间质瘤的临床特征及外科治疗

目的探讨十二指肠间质瘤的临床特征及外科治疗效果. 方法回顾性分析我科1990～2004年14例十二指肠间质瘤的临床资料. 结果病理类型:良性2例,潜在恶性4例,恶性8例.50.0%(7/14)发生在降部,其中恶性占57.1%(4/7).临床表现为右上腹肿物(6/14),右上腹隐痛不适(5/14)和乏力、体重下降(3/14),诊断手段为十二指肠低张造影(13/14)、B超(13/14)和CT(9/14).肿瘤距离十二指肠大乳头＜3 cm或位于降部、直径≥5 cm者宜行胰十二指肠切除术,肿瘤距离十二指肠大乳头＞3 cm及较小者宜行十二指肠节段性切除术. 结论十二指肠间质瘤恶性多见,临床表现无特异性,主要依靠十二指肠低张造影、B超、CT、EUS确诊,对无远处转移的肿瘤应积极争取根治性切除.     

Morphometric diagnosis of bladder tumor

This paper reports the morphometric analysis results of 100 cases of bladder tumor cells with a Q-900 computer-assisted image analysis system. According to the nuclear area, axis ratio and area ratio of tumor nuclei, bladder transitional cell tumors were divided into 4 grades. This system is called the morphometric grading system (M grading). The results show that the higher the M grading, the lower the survival rate and the higher the recurrence rate. As the M grade increases the tumors could be accompanied by muscular invasion. When recurring, the tumor has a poor prognosis if M grading increases. We conclude that the morphometric grading system is able to yield a quantitative pathologic diagnosis and can predict the biological behavior of bladder tumors. Recently, new techniques for diagnosing and predicting the biological behavior of bladder tumors have been developed. One such technique is morphometric analysis of bladder transitional cell carcinoma with computer-assisted image instruments [1]. Because this morphometric method is easily applicable to pathological section routinely stained with HE and the results are reproducible and more objective, the studies about morphometric analysis of bladder tumor have increased in recent times. This paper reports the preliminary morphometric analysis results of bladder tumor cells examined by a Q-900 image analysis instrument for 100 cases.     

急性脑梗死选择性动脉溶栓治疗与护理

综述了急性脑梗死选择性动脉溶栓治疗与护理,详细介绍了脑梗死的发病机理、溶栓时机、适应证、介入治疗方法及护理.     

42例室性心动过速治疗的临床分析

本文介绍了42例室性心动过速的临床资料和特点,讨论了早期后除极与室性心动过速的关系,并探讨各型室速的治疗。     

随机系统的最小熵控制

本文放弃传统的MSE准则,从信息论观点出发,发展了随机系统的一种最小熵(ME)控制方法,并从ME控制的等价性、控制限度、存在性、唯一性及必要条件等方面,研究了ME控制的合理性和实用性。ME方法是一种全局分析法,它不仅包含了MSE和MAP准则,且由于全文在整个推导中并未假定高斯性、线性和非时变等,因而原则上适用于诸如非高斯、非线性、时变等传统方法难以处理的复杂系统;不仅适用于工程系统,将其推广到决策、社会、经济等领域会更为自然和切合实际。