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1.
This study examined the influence of the challenge level of to-be-learned stimulus on learning strategies in novice and advanced dancers. In Study 1, skill-level appropriate dance routines were developed for novice and advanced jazz dancers. In Study 2, 8 novice and 9 advanced female jazz dancers attempted to learn and remember the two routines in mixed model factorial design, with one between-participants factor: skill level (novice or advanced) and two within-participants factors: routine (easy or difficult) and performance (immediate or delayed). Participants were interviewed regarding the strategies used to learn and remember the routines. Results indicated that advanced performers used atypical learning strategies for insufficiently challenging stimuli, which may reflect characteristics of the stimuli rather than the performer. The qualitative data indicate a clear preference of novice and advanced performers for spatial compatibility of stimuli and response. 相似文献
2.
2002年4月23日晚自习,我右边的一颗牙突然发了疯一般疼起来。作业还有很多,很累。我心里暗暗的兴奋,这是个回家的理由。要知道,在封闭管理的学校里,回家是最大的幸福呀。 相似文献
3.
Wassenberg R Feron FJ Kessels AG Hendriksen JG Kalff AC Kroes M Hurks PP Beeren M Jolles J Vles JS 《Child development》2005,76(5):1092-1103
The relation between cognitive and motor performance was studied in a sample of 378 children aged 5-6. Half of these children had no behavior problems; the others were selected for externalizing (38%) or internalizing problems (12%). Quantitative and qualitative aspects of motor performance were related to several aspects of cognition, after controlling for the influence of attention. No relation between global aspects of cognitive and motor performance was found. Specific positive relations were found between both aspects of motor performance, visual motor integration and working memory, and between quantitative aspects of motor performance and fluency. These findings reveal interesting parallels between normal cognitive and motor development in 5- to 6-year-old children that cannot be ascribed to attention processes. 相似文献
4.
Singh PP Chandra A Mahdi F Roy A Sharma P 《Indian journal of clinical biochemistry : IJCB》2010,25(3):225-243
The antioxidants are essential molecules in human system but are not miracle molecules. They are neither performance enhancers
nor can prevent or cure diseases when taken in excess. Their supplemental value is debateable. In fact, many high quality
clinical trials on antioxidant supplement have shown no effect or adverse outcomes ranging from morbidity to all cause mortality.
Several Chochrane Meta-analysis and Markov Model techniques, which are presently best available statistical models to derive
conclusive answers for comparing large number of trials, support these claims. Nevertheless none of these statistical techniques
are flawless. Hence, more efforts are needed to develop perfect statistical model to analyze the pooled data and further double
blind, placebo controlled interventional clinical trials, which are gold standard, should be implicitly conducted to get explicit
answers. Superoxide dismutase (SOD), glutathione peroxidase and catalase are termed as primary antioxidants as these scavenge
superoxide anion and hydrogen peroxide. All these three enzymes are inducible enzymes, thereby inherently meaning that body
increases or decreases their activity as per requirement. Hence there is no need to attempt to manipulate their activity nor
have such efforts been clinically useful. SOD administration has been tried in some conditions especially in cancer and myocardial
infarction but has largely failed, probably because SOD is a large molecule and can not cross cell membrane. The dietary antioxidants,
including nutrient antioxidants are chain breaking antioxidants and in tandem with enzyme antioxidants temper the reactive
oxygen species (ROS) and reactive nitrogen species (RNS) within physiological limits. Since body is able to regulate its own
requirements of enzyme antioxidants, the diet must provide adequate quantity of non-enzymic antioxidants to meet the normal
requirements and provide protection in exigent condition. So far, there is no evidence that human tissues ever experience
the torrent of reactive species and that in chronic conditions with mildly enhanced generation of reactive species, the body
can meet them squarely if antioxidants defense system in tissues is biochemically optimized. We are not yet certain about
optimal levels of antioxidants in tissues. Two ways have been used to assess them: first by dietary intake and second by measuring
plasma levels. Lately determination of plasma/serum level of antioxidants is considered better index for diagnostic and prognostic
purposes. The recommended levels for vitamin A, E and C and beta carotene are 2.2–2.8 μmol/l; 27.5–30 μmol/l; 40–50 μmol/l
and 0.4–0.5 μmol/l, respectively. The requirement and recommended blood levels of other dietary antioxidants are not established.
The resolved issues are (1) essential to scavenge excess of radical species (2) participants in redox homeostasis (3) selective
antioxidants activity against radical species (4) there is no universal antioxidant and 5) therapeutic value in case of deficiency.
The overarching issues are (1) therapeutic value as adjuvant therapy in management of diseases (2) supplemental value in developing
population (3) selective interactivity of antioxidant in different tissues and on different substrates (4) quantitative contribution
in redox balance (5) mechanisms of adverse action on excess supplementation (6) advantages and disadvantages of prooxidant
behavior of antioxidants (7) behavior in cohorts with polymorphic differences (8) interaction and intervention in radiotherapy,
diabetes and diabetic complications and cardiovascular diseases (9) preventive behavior in neurological disorders (10) benefits
of non-nutrient dietary antioxidants (11) markers to assess optimized antioxidants status (12) assessment of benefits of supplementation
in alcoholics and heavy smokers. The unresolved and intriguing issues are (1) many compounds such as vitamin A and many others
possessing both antioxidant and non-antioxidant properties contribute to both the activities in vivo or exclusively only to
non-antioxidant activity and (2) since human tissues do not experience the surge of FR, whether there is any need to develop
stronger synthetic antioxidants. Theoretically such antioxidants may do more harm than good. 相似文献
5.
PP·K 《世界儿童(小学生阅读版)》2009,(12)
12月,在我们世界的西方,有个很重要的日子,被称为"圣诞节",传说在那一天,有个叫"圣诞老人"的家伙会给所有的孩子送上礼物。也许不是每个小孩都知道这个节日的由来,不过有礼物收,就是这个节日最大的乐趣了。虽然圣诞老人的故事世界上几乎每个孩子都听过,但不是每个孩子都有圣诞老人送来礼物的待遇,比如在酋长小时候,这天就从没收到过礼物。圣诞节的中午,我享受了一顿丰富的午餐后,睡意便凶猛来袭,我来不及抵抗就陷入梦乡…… 相似文献
6.
PP·K 《世界儿童(小学生阅读版)》2009,(10):40-41
周末清晨,躺在阳台的摇椅上,左手拿书,右手端茶,真是享受啊！不过,我家狗狗却见不得我这副悠闲的样子,不停地在我脚边转悠,咬裤腿、摇尾巴、狂吠。 相似文献
7.
TM Andrews RM Price LS Mead TL McElhinny A Thanukos KE Perez CF Herreid DR Terry PP Lemons 《CBE life sciences education》2012,11(3):248-259
This study explores biology undergraduates' misconceptions about genetic drift. We use qualitative and quantitative methods to describe students' definitions, identify common misconceptions, and examine differences before and after instruction on genetic drift. We identify and describe five overarching categories that include 16 distinct misconceptions about genetic drift. The accuracy of students' conceptions ranges considerably, from responses indicating only superficial, if any, knowledge of any aspect of evolution to responses indicating knowledge of genetic drift but confusion about the nuances of genetic drift. After instruction, a significantly greater number of responses indicate some knowledge of genetic drift (p = 0.005), but 74.6% of responses still contain at least one misconception. We conclude by presenting a framework that organizes how students' conceptions of genetic drift change with instruction. We also articulate three hypotheses regarding undergraduates' conceptions of evolution in general and genetic drift in particular. We propose that: 1) students begin with undeveloped conceptions of evolution that do not recognize different mechanisms of change; 2) students develop more complex, but still inaccurate, conceptual frameworks that reflect experience with vocabulary but still lack deep understanding; and 3) some new misconceptions about genetic drift emerge as students comprehend more about evolution. 相似文献
8.
我家马路对面有一个小摊儿,到晚上只卖两种商品,燕京啤酒和烤羊肉串,好吃不贵,我经常去那儿小规模地豪迈一下。那天去,摊儿没了。见城管队员趾高气扬地抱手站着,摊主则垂头丧气地蹲在一边儿。全副家当三轮车、炭烤箱子、电冰箱,都被挪到了卡车上,随着卡车的喘息,瑟瑟颤抖,被取缔查封没收了。 相似文献
9.
PP·K 《世界儿童(小学生阅读版)》2010,(5):47-47
警报声“滴滴”长鸣,我头皮阵阵发麻！
从小“警钟长鸣”这个词就和成绩下降有亲戚关系,我下意识地看看周围,呼！还好,老师看不见,桌上没有考卷,不过却有个身穿白衣的胡子伯伯！ 相似文献
10.
Kbongbong PP 《音乐世界》2012,(15):32-33
近日，身为立顿新一季代言人的彭于晏现身上海热带风暴参加活动。彭于晏热情、阳光、爱冒险的性格很符合该品牌的特质。在采访的过程中，他与我们分享了他从艺道路上的趣事。 相似文献