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《黑龙江畜牧兽医》2016,(10)
为了深入贯彻"全民健身"和"国家足球战略",使足球运动应成为推动全民健身以及高校体育教育改革的一支重要力量。笔者采用文献法、调查法、数理统计法等科研方法,对足球专选课情况、学生学习动机和教学内容、教学反馈情况等方面进行了调查研究。结果表明:足球专选课教学内容重视竞技能力的教学,缺乏递进性和发展性;足球专选课程的选报人数出现了日益萎缩的情况。专选课的学生对于足球运动的兴趣浓厚,学生选报的动机端正积极;足球专选课程的教学方法比较单一陈旧,对教学质量和教学效果产生了不良影响。建议开展足球专选课程教学改革,提高教学质量;提高教师素质水平,加强高校足球专选教师队伍建设;拓展优化足球教学内容,挖掘开发足球课程资源;顺应时代发展趋势,加强对学生综合素质的培养。 相似文献
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以广东工业大学2002级至2004级本科1年级和2年级学生体育选修课中选报体育舞蹈课的学生共540人(其中男生230人,女生310人)为研究对象,通过1学期的体育舞蹈选项课教学,对他们进行问卷调查及部分生理指标的测量,发现体育舞蹈对大学生有独特的锻炼价值。主要表现在:第一,体育舞蹈具有较高的健身价值;第二,能锻炼学生美的体态和培养学生审美能力;第三,体育舞蹈是休闲、社交和娱乐活动的好选择;第四,能更好地培养学生体育活动习惯。通过分析广东高校体育舞蹈课的开设状况及存在的问题,从而提出高校体育舞蹈课改革的建议。 相似文献
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通过文献资料法、访谈法等发现川南地区高校公共体育田径选修课的开展存在学生对田径选项课认知不够、教学器材短缺、教学内容选择不科学、田径课程缺乏趣味性等制约因素.提出一些有利开展的建议,来更好的为高校公共体育田径选修课程开展服务. 相似文献
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通过查阅文献显示,高校体育课选项中三大球篮、排、足球逐渐不太受学生欢迎,然而三小球乒、羽、网球受到了学生们的追捧,特别是网球被人们成为"贵族体育",该项目深受现在大学生们的喜爱。黑龙江省网球开展的比较的晚一些,还存在师资力量不足,场地不能满足学生学习与训练的需求,特别是受气候特点、地域的影响室内场地更加的缺乏,远远不能满足高校学生学习与训练的需求,通过问卷调查法、访谈法和文献资料法对网球教学、训练及学生课外活动等现状进行研究,为高校网球教学与训练的发展提供了理论依据。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献