蜂王浆对大鼠力竭运动能力影响的实验研究   总被引：7，自引：0，他引：7  

赵光  解黎明 《四川体育科学》2003,(1):15-16,35

研究目的：探讨服用蜂王浆的大鼠，作力竭运动时，减轻和防止自由基对机体组织的损伤和抗疲劳作用。研究方法：灌喂蜂王浆的大鼠为试验组与对照组比较，测试二组在力竭运动时体重、运动能力、线粒体丙二醛（MDA）、超氧化物歧化酶（SOD）、血浆PH值，血乳酸、血清总钙ATP的合成能力以及肝、肌糖原的变化。研究结果：实验组与对照组比较体重明显增加，运动能力显著提高，MDA降低明显，SOD活性显著增高，ATP和PH值相应提高，血乳酸和血清总钙较低，肝、肌糖原明显增多。蜂王浆作为一种有效的体能恢复剂在推广和利用上有广泛的前景。  相似文献   

Interactive Influences of Perceived Social Contexts on the Reading Achievement of Urban Middle Schoolers with Learning Disabilities     

Jane E. Fleming  Thomas D. Cook  C. Addison Stone 《Learning disabilities research & practice》2002,17(1):47-64

This study examined the effects of social influences in the lives of an ethnically diverse sample of fifth through eighth grade students with and without learning disabilities (LD) using survey data and academic achievement scores collected in 19 Chicago public schools from 1993–1997. Similarities and differences in student perceptions of school, family, and peer group contexts were examined. In addition, longitudinal data were analyzed using hierarchical linear modeling (HLM) to identify contextual influences on changes in student reading achievement over time. Comparisons of student responses confirm and extend existing findings in the literature concerning the perceptions of students with LD of their social environments. In particular, having a learning disability was associated with consistent, mostly negative, effects on social relations across the contexts of students’ lives, regardless of gender, race, grade, and socioeconomic status. In addition, student perceptions of their friendship groups were found to have small, but significant, effects on their growth in reading achievement over the course of middle school. While students with and without LD had somewhat different views of their social contexts, the processes working within these environments appeared to affect their reading achievement in similar ways. The results suggest that careful attention should be paid to the social contexts of students’ lives when planning academic interventions.  相似文献   

Bus Stop: American Eye vs. Small-Town Ear     

William E.H. Meyer 《Journal of American culture (Malden, Mass. : 2003)》1993,16(1):35-38

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Survey of reader preferences concerning the format of NASA langley-authored technical reports     

Thomas E. Pinelli  Rebecca O. Barclay  John M. Kennedy 《Publishing Research Quarterly》1997,13(2):48-68

The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D to the U.S. aerospace industry. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the NASA/DoD Aerospace Knowledge Diffusion Research Project. In this article, we summarize the literature on the U.S. government technical report and present the results of a survey of U.S. aerospace engineers and scientists that solicited their opinions concerning the format of NASA Langley Research Center (LaRC)-authored technical reports. To learn more about the preferences of U.S. aerospace engineers and scientists concerning the format of NASA LaRC-authored technical reports, we surveyed 133 report producers (i.e., authors) and 137 report users in March–April 1996. Questions covered such topics as: (a) the order in which report components are read; (b) components used to determine if a report would be read; (c) those components that could be deleted; (d) the placement of such components as the symbols list; (e) the desirability of a table of contents; (f) the format of reference citations; (g) column layout and right margin treatment; and (h) writing style in terms of person and voice. Mail (self-reported) surveys were used to collect the data. The response rates for report producers (i.e., authors) was 68% and for users, was 62%.  相似文献   

Neuroimaging Studies of Reading Development and Reading Disability     

Kenneth R. Pugh  W. Einar Mencl  Annette R. Jenner  Jun Ren Lee  Leonard Katz  Stephen J. Frost  Sally E. Shaywitz  Bennett A. Shaywitz 《Learning disabilities research & practice》2001,16(4):240-249

Converging evidence from a number of neuroimaging studies, including our own, suggest that fluent word identification in reading is related to the functional integrity of two left hemisphere posterior systems: a temporo-parietal system and a ventral occipito-temporal system. These posterior systems are functionally disrupted in developmental dyslexia. Reading disabled, relative to nonimpaired, readers demonstrate heightened reliance on both inferior frontal and right hemisphere posterior regions, presumably in compensation for the LH posterior difficulties. We propose a neurobiological account suggesting that for normally developing readers the temporo-parietal system predominates at first, and is associated with aspects of processing critical in learning to integrate orthography with phonological and lexical-semantic features of printed words. The occipito-temporal system, by contrast, constitutes a fast, late-developing, word-identification system that underlies fluent word recognition in skilled readers.  相似文献   

Justice in the process,not in the results     

Walter E. Williams 《Academic Questions》1996,9(4):76-79

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Evaluation of a specific test in cross-country skiing     

E Mygind  B Larsson  T Klausen 《Journal of sports sciences》1991,9(3):249-257

Six Danish male cross-country skiers were studied during the end-of-summer and winter seasons. Their maximal oxygen uptake was measured while running on a treadmill and using a ski ergometer incorporating the double-poling technique. Maximal oxygen uptake during treadmill running and double-poling was correlated with performance, expressed as a ranking score during 10 ski races. The tests were undertaken in September, December and April. Upper body maximal oxygen uptake increased 5.8% from September to December, decreasing to 2.3% above the September level in April. Upper body work output (2 min at maximal intensity) increased 11.8% from September to December (P less than 0.05). The relationship between upper body and leg maximal oxygen uptake--the upper body/leg ratio--was 89.4% in September. In four skiers, both treadmill and upper body tests were undertaken on each test occasion. The upper body/leg ratio changed from 87.7% in September to 95.7% in December. In April, the ratio was 91.0%. The maximal oxygen uptake measured using the ski ergometer during double-poling was significantly correlated with performance (P less than 0.05). It is concluded that the upper body ski ergometer can be used in the evaluation of elite cross-country skiers.  相似文献   

REPORT OF MEMBERSHIP COMMITTEE 1930-1931     

Schramm EE 《Bulletin of the Medical Library Association》1931,20(1):31-33

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The problem of Religious instruction with special reference to Wales     

E.J. Jones M.A. 《British Journal of Religious Education》1934,1(1):52-56

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REPORT OF THE COMMITTEE ON THE COST OF CURRENT MEDICAL PERIODICALS FOR THE YEAR 1933-1934     

Cunningham ER 《Bulletin of the Medical Library Association》1934,23(1):56-60

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