跳远运动员膝关节屈伸肌群形态与力量的比较研究     

鲁家琪 《福建体育科技》2006,25(3):18-20

本研究旨在探讨跳远运动员膝关节屈伸肌群形态与专项力量间的相互关系。肌肉形态测量采用CT断层扫描,力量测试采用美国Cybex-Norm等速测力系统,数据处理采用SPSS11.0软件。研究结果表明:从形态上看,一级跳远运动员大腿肌肉各相应断面面积明显大于二级运动员,且右侧略大于左侧;在相同测试速度下,一级运动员肌肉收缩力量大于二级运动员,且右侧略大于左侧;跳远运动员在低速屈膝、伸膝时,肌肉力量与其横断面积密切相关。  相似文献   

彝语重叠词词法研究     

马辉 《毕节学院学报》2016,(4):48-52

重叠是彝语的词法之一,主要集中在形容词部分。彝语重叠名词重在构词;重叠形容词重在构形;动语素一旦重叠涉及句法,表疑问。有的形语素重叠也涉及句法问题,表疑问;属格代词重叠后构成重叠反身代词。  相似文献   

复肾口服液对阿霉素肾病大鼠肾脏形态的影响     

张淑萍  靳国印  李旺  张晓丽  薄爱华 《河北北方学院学报(医学版)》2007,24(2):9-12

目的：观察复肾口服液对阿霉素肾病大鼠肾脏的形态学影响。方法：采用尾静脉一次性注射阿霉素（ADR）复制肾病综合征模型。用光学显微镜、电子显微镜观察肾小球毛细血管、上皮细胞、基底膜及肾小管的病理形态学改变。结果：复肾口服液能使阿霉素肾病大鼠蛋白尿显著降低，肾小管管腔内的蛋白管型明显减少，肾小球淤血及上皮细胞和基底膜的损伤程度明显减轻，肾小球上皮细胞足突融合明显改善。结论：复肾口服液可促进肾病大鼠肾小球上皮细胞的修复及滤过膜功能的恢复，但存在着量效依赖关系。  相似文献   

中国忍冬科植物花粉形态及其在分类上的意义     

胡嘉琪  贺超兴 《中国科学院研究生院学报》1988,26(5):343-352

     本文报道了我国忍冬科54个样品，包括12属31种植物的花粉扫描电镜观察的结果, 描述了本科各属主要代表种的花粉形态特征;  及不同种的花粉类型，为化石花粉鉴定提供参考资料, 同时根据花粉的形状、大小、萌发孔及外壁雕纹的异同，讨论本科及科以下分类群的位置和系统关系。  相似文献   

稻属分类的现状及存在问题   总被引：1，自引：0，他引：1  

卢宝荣  葛颂  桑涛  陈家宽  洪德元 《中国科学院研究生院学报》2001,39(4):373-388

稻属(Oryza L．是禾本科中重要的植物类群，该属含20余种，广泛分布于全球热带和亚热带地区。未来水稻育种的重大突破还将有赖于对稻属基因库中丰富种质资源，特别是野生稻资源的利用和开发。由于稻属植物在农业生产中的重要作用，引起了众多的植物分类学家、遗传学家、育种学家和分子生物学家的广泛研究。稻属自Linnaeus于1753年建立以来的200多年中，无论在物种的数量和分类系统上都产生了很大的变化。多位学者对稻属的属以下等级和种间的分类都做了详细的工作，对稻属现代分类系统的建立起到了重要的作用。Roschevicz(1931)对稻属全面深入的研究为后来的稻属系统分类奠定了基础。Sharma &; Shastry (1965) 建立的稻属分类系统在很大程度上受了 Roschevicz(1931)工作的影响，对属以下种以上的分类等级也处理得较合理，但是他们对稻属的分类定义较为广泛，包括了好几个如今已不放在稻属的物种。Vaughan(1989)对全球的稻属标本进行了较为全面的查证和研究，他建立的稻属系统不仅在属的界定上更为合理，而且对稻属中各物种的形态变异、地理分布和种间的关系，都有更清楚的描述。遗憾的是，Vaughan (1989)采用的属下等级——“复合体”(complex)，不符合国际植物命名法规(ICBN)的规定。Lu(1999)在对前人大量工作的基础上，结合现代对稻属的研究成果并包括了近年来发表的一些新种，建立了稻属3组7系24种的分类系统。本文结合最新的研究成果对稻属作了进一步的修订，列出了以形态特征为基础的分种检索表，并对稻属分类中仍存在的一些问题进行了讨论。  相似文献   

Processing inflected morphology in second language word recognition: Russian-speakers and English-speakers read Hebrew     

Wade-Woolley  Lesly  Geva  Esther 《Reading and writing》1999,11(4):321-343

This paper reports on an investigation into the morphosyntactic processing of second language (L2) learners who differ in terms of language learning experience. The chief area of interest was the relationship of L2 learning patterns and experience to the acquisition of automatized processing skills in the morphological domain. English- and Russian-native speakers of Hebrew as L2 were assessed on their sensitivity to complex morphological structures which do not exist in their respective native languages (L1). The Hebrew word formation rule which was the focus of investigation was the affixation of prepositions to nouns, resulting in single words which are also full prepositional phrases. In both English and Russian, prepositions and nouns in prepositional phrases must be autonomous. Participants named high frequency words of one (e.g., /parah/ cow) and three morphemes (e.g., /bakis/ in the pocket), which were presented in a control condition and also presented in conditions which either preserved or disrupted the natural morpheme boundaries through the manipulation of font-size. In addition to the experimental measure, participants were also asked to read an expositional passage from a popular Israeli newspaper. Results showed that the Russians, although significantly more accurate than the English speakers at text reading, were significantly less accurate and slower than the English at the naming task, and less impaired by the experimental manipulations. The results are discussed in terms of automaticity, print exposure and age of L2 acquisition.  相似文献   

Learning to spell in Hebrew: Phonological and morphological factors     

Ravid  Dorit 《Reading and writing》2001,14(5-6):459-485

This paper investigates children's developingknowledge of the Hebrew spelling system in view of theclaim that language-specific typology affects the rateand the pattern of development of orthographicspelling. Hebrew is a morphologically syntheticlanguage with a phonologically ``deep' orthography, onthe one hand, and a consistent representation ofmorphology in the spelling system, on the other. Thispaper focuses on the difference between representingcontent words versus grammatical words, and rootsversus morphemic and attached function letters inwritten Hebrew. The paper describes two studies. InStudy 1, compositions from gradeschool children (grade1 through 6) were analyzed for types of spellingerrors; in Study 2, children from grades 2–4 wereadministered a spelling task. Results indicate thatgrammatical words are spelled correctly before contentwords, and that within content words, the correctspelling of function letters precedes that of rootletters. These differences are attributed to factorsof transparency, consistency and frequency, coupledwith gradeschoolers' growing perception ofphonological and morphological patterning in Hebrew.  相似文献   

Influence of polarized bias and porous silicon morphology on the electrical behavior of Au-porous silicon contacts     

Zhao Y  Li DS  Xing SX  Yang DR  Jiang MH 《Journal of Zhejiang University. Science. B》2005,6(11):1135-1140

INTRODUCTION Porous silicon (PS) attracts the attention of many researchers due to the possibility of developing PS based devices, including optoelectronics, photo re- sistors, solar cells and light emitting diodes (Balucani et al., 1999; Palma et al., 1999a; Stievenard and Deresmes, 1995). To integrate PS into electronic circuits or to develop PS based devices, the electrical properties of this material must be studied thoroughly. It is a difficult case because this material has a ve…  相似文献   

The Processing of Inflectional Morphology: A Comparison of Children with and without Dyslexia     

Egan  Joanne  Pring  Linda 《Reading and writing》2004,17(6):567-591

Children aged 11–12 years with a diagnosis of dyslexia (DR) were compared to chronological and reading-age matched poor readers (PR), and two normal reader groups, age-matched (CA) and spelling and reading-age matched (SA–RA), on their processing of inflectional morphology. In comparison to SA–RAs and PRs, the DRs made more spelling errors on regular past tense verb endings relative to irregular past tense verbs and non-verbs. In reading, the DRs took longer than the other groups to make decisions in the written but not oral condition of a tense judgement task. In addition, they were less affected than the PR and SA–RA groups by case altered disruption to the morpheme boundary of inflected verbs. The findings suggest dyslexic children do not show deficits in morphological processing in spoken language, but they are slower at reading and less accurate at spelling regularly inflected verbs compared with normally developing younger children. This difference could plausibly be accommodated within the Phonological Deficit Hypothesis of dyslexia.  相似文献   

对胎儿胸腺细胞、血胸屏障和胸腺小体的形态学研究     

张辉  戴洁  夏苓  李海峰  刘洪莲  薄爱华 《河北北方学院学报(医学版)》1992,(2)

为了阐明不同胎龄胸腺细胞、血胸屏障及胸腺小体的形态特点,使用光镜和电镜技术,观察了受精龄10～40周胎儿胸腺31例,对胸腺细胞早期,中期与成熟过程中超微结构特点,血胸屏障层次与特点和胸腺小体的密度和超微结构,进行观察、统计和讨论、为临床利用胎儿胸腺提供了形态学依据.  相似文献