排序方式： 共有65条查询结果，搜索用时 15 毫秒
51.
目的：为研究畸形胎儿的分类和三胚层分化异常的机理积累资料.方法：HE染色,光镜下观察多器官未发育畸形胎儿的组织结构.结果：胎儿几处组织呈正常发育状态,未见神经组织.结论：胎儿多器官未见发育,属罕见畸形.能见组织呈正常发育状态,三胚层分化不全. 相似文献
52.
李强 《阿坝师范高等专科学校学报》2001,(1):35-39
根据参加《学生易误词语辨析词典》的编写体会和通过对词典中用词错误的类型统计分析 ,发现词语运用中的错误主要还不是语法问题 ,而更多取决于词义 ,但尚未引起教学的足够重视。文章就教材的编写、词汇教学、词义解释等问题进行了思考和探讨 ,提出了建议。 相似文献
53.
骈丽军 《三门峡职业技术学院学报》2013,(4):91-93
目前,我国旅行社产品同质化现象严重,要在激烈的竞争中生存和发展,应该采取旅游线路产品差异化策略、旅游服务差异化策略及营销差异化策略等,最终实现品牌化发展,促使旅行社核心能力的形成,以实现可持续发展. 相似文献
54.
Xiao-zhou Mou Jian Lin Jin-yang Chen Yi-fei Li Xiao-xing Wu Bing-yu Xiang Cai-yun Li Ju-ming Ma Charlie Xiang 《Journal of Zhejiang University. Science. B》2013,14(11):961-972
Orthotopic liver transplantation (OLT) is the only proven effective treatment for both end-stage and metabolic liver diseases. Hepatocyte transplantation is a promising alternative for OLT, but the lack of available donor livers has hampered its clinical application. Hepatocyte-like cells (HLCs) differentiated from many multi-potential stem cells can help repair damaged liver tissue. Yet almost suitable cells currently identified for human use are difficult to harvest and involve invasive procedures. Recently, a novel mesenchymal stem cell derived from human menstrual blood (MenSC) has been discovered and obtained easily and repeatedly. In this study, we examined whether the MenSCs are able to differentiate into functional HLCs in vitro. After three weeks of incubation in hepatogenic differentiation medium containing hepatocyte growth factor (HGF), fibroblast growth factor-4 (FGF-4), and oncostain M (OSM), cuboidal HLCs were observed, and cells also expressed hepatocyte-specific marker genes including albumin (ALB), α-fetoprotein (AFP), cytokeratin 18/19 (CK18/19), and cytochrome P450 1A1/3A4 (CYP1A1/3A4). Differentiated cells further demonstrated in vitro mature hepatocyte functions such as urea synthesis, glycogen storage, and indocyanine green (ICG) uptake. After intrasplenic transplantation into mice with 2/3 partial hepatectomy, the MenSC-derived HLCs were detected in recipient livers and expressed human ALB protein. We also showed that MenSC-derived HLC transplantation could restore the serum ALB level and significantly suppressed transaminase activity of liver injury animals. In conclusion, MenSCs may serve as an ideal, easily accessible source of material for tissue engineering and cell therapy of liver tissues. 相似文献
55.
《文物保护研究》2013,58(2):79-87
AbstractIn the majority of cases, the red color of cinnabar on objects of cultural heritage is well preserved, though turning black is often claimed and has been the subject of investigations. To evaluate conditions for the stability of the pigment and understand the reactions, in this paper the problem is approached from various viewpoints. First of all the natural form cinnabarite is compared with the artificially prepared pigment vermilion. This establishes a differentiation of types in terms of quality, depending on structural impurities. With regard to the pigment's reactions influencing the discoloration, the most commonly mentioned environmental factors, such as radiation or halogens, are evaluated. In relation to various usages, the pigment's structural stability is then viewed in connection with adjacent pigments, glues, and the substrate, which may lead to a brown or black coloration or even the release of mercury, whereas the color is preserved in most cases when used on lime or in ink and lacquer. Due to the materials’ properties, attention is drawn to the fact that discoloration to a brownish-black is not necessarily a sign of damage and harmful reaction products, but may indicate good preservation of the painted material, provided that the mercury can be bound in the substrate. 相似文献
56.
Many primary school teachers experience difficulties in effectively differentiating in the regular classroom. This study investigated the effect of the STIP-approach on teachers' differentiation activities and self-efficacy, and children's learning outcomes and instructional value. Teachers using the STIP-approach for their science lessons were compared to teachers using their regular programme. 16 teachers and 306 children were observed and received questionnaires at four different times. Results show that using the STIP-approach resulted in more differentiation in task, content, and process. Moreover, children of STIP-teachers who showed many types of differentiation activities learnt more than children of STIP-teachers who differentiated less. 相似文献
57.
成人高校必须靠品牌赢得生存 总被引：1，自引：0，他引：1
胡晓萍 《四川教育学院学报》2006,22(1):4-7
大学连续扩招使我国普通高等教育资源不足的矛盾大大缓解,也使高等教育从卖方市场过渡到买方市场。在买方市场条件下,品牌是吸引顾客的重要因素。成人高校因为缺乏品牌资源正面临着前所未有的生存危机。成人高校应当从分析其顾客———学生的需求的异质性入手,从教育的细分市场中找到品牌定位和生存策略,以市场为导向进行专业设置和课程设置,以形成能适应社会生活的优秀毕业生群体。成人高校还必须培养出自己的知名教授,建立起自己的品牌课程,并把学校品牌的创立和创新作为学校管理的一项重要工作,才能走出生源困境,为自己赢得更加广阔的生存空间。 相似文献
58.
【目的】研究不同类型高校学报功能存在的差异,为不同类型高校学报的发展和改革提供参考。【方法】根据高校的科研规模和在校研究生规模大小,将高校分为研究型大学和教学型大学,并对两类大学所属学报的功能进行剖析,进而提出不同学报的发展路径。【结果】研究型大学学报应依托学校学科优势,或通过重大理论选题,开展交叉学科的研究,充分发挥学报的综合性优势,或通过独立或联合创建专业刊或专题刊,参与整个学术期刊的竞争;教学型大学学报应在立足本校的同时,为更多高校甚至全国高校师生服务,尤其为培育学术新人提供服务。【结论】不同类型高校学报因办刊环境变化及自身办刊条件的不同,功能应有所不同,其发展路径也不同。 相似文献
59.
In this article we present an empirical analysis of the ‘patterns of cultural choice’ in the musical domain in Italy. The
main goal of the article is to verify whether musical tastes in Italy are diversified, with the presence of a group of ‘cultural
omnivores’. Our study is based on the theoretical model of the demand for cultural goods proposed by Lévy-Garboua and Montmarquette
(1996). In the empirical analysis we simultaneously evaluate the probability of choosing different musical genres. Through the
specification of the set of alternatives into three groupings of musical genres —“only classical music”, “only popular music”
and “all music”—we were able to detect the relative impact of several socio-economic characteristics on the probability of
having “univorous” or “omnivorous” musical likings. In addition, our approach allows us to verify the existence of different
patterns of music consumption by testing the significance of differences among the estimated coefficients of the probability
functions related to the three groupings of musical genres. We find that age, gender and education are important predictors
of an omnivorous taste.
相似文献
| Carlofilippo FrateschiEmail: |
60.
张雪丽 《黄冈职业技术学院学报》2011,13(1):70-75
随着各行各业对度假地召开会议的增多,度假酒店的目标市场转向会议会展团队,而大规模的会议团队入住、用餐等一系列的拥挤场面严重破坏了度假酒店的恬静氛围,与酒店散客的休闲度假需求相矛盾,而散客能为酒店带来高额的营业利润,是度假酒店旺季的主要客源市场。如何寻找一种让会议会展客源和度假散客互为融合的经营格局,这是度假酒店经营者必须研究的现实问题。以杭州太虚湖度假酒店为例,通过问卷调查,应用SPSS11.5社会科学统计软件,分析度假酒店休闲服务与会议服务的服务主张,探讨度假酒店休闲与度假融合途径。 相似文献