从比较中认识:"农教"应立足"农"字,为"三农"服务

农业教育是我国教育系统的重要组成部分。我国是个农业大国,实现农业现代化必须培养出各级各类的农业人才和提高劳动者素质。因此,农业教育要坚定不移地为"三农"服务;开拓创新,以自己的办学特色、办学水平、办学质量,求生存、求发展,这是办好农业教育惟一出路。     

西藏“三农”问题的现状与对策

农业、农村、农民问题是当前社会普遍关注的主要问题,事关整个社会的稳定与可持续发展。统筹城乡经济,建设现代农业,发展农村经济,增加农牧民收入,是全面建设小康社会的重大任务。在西藏273.68万人口中,有213.65万在农牧区,其中低收入者占全区总人口的63.96%,这是一个很重要的市情。如何改变现状,提高农牧民素质,增加农牧民收入,特别是现金收入,是解决"三农"问题的难点,也是全面建设小康社会的重点。     

Ergodic theory, randomness, and "chaos"

Ergodic theory is the theory of the long-term statistical behavior of dynamical systems. The baker's transformation is an object of ergodic theory that provides a paradigm for the possibility of deterministic chaos. It can now be shown that this connection is more than an analogy and that at some level of abstraction a large number of systems governed by Newton's laws are the same as the baker's transformation. Going to this level of abstraction helps to organize the possible kinds of random behavior. The theory also gives new concrete results. For example, one can show that the same process could be produced by a mechanism governed by Newton's laws or by a mechanism governed by coin tossing. It also gives a statistical analog of structural stability.     

Comment on "The Brain of LB1, Homo floresiensis"

Endocast analysis of the brain Homo floresiensis by Falk et al. (Reports, 8 April 2005, p. 242) implies that the hominid is an insular dwarf derived from H. erectus, but its tiny cranial capacity cannot result from normal dwarfing. Consideration of more appropriate microcephalic syndromes and specimens supports the hypothesis of modern human microcephaly.     

再论“三农”问题的解决——与温铁军先生商榷

就温铁军先生关于"三农"问题的3个观点提出看法。认为:温先生的观点对问题的解决不具备积极作用。提出依靠政府补贴和工业反哺农业是打破"三农"问题坚冰和中国经济得以全面、持续和协调发展的必然选择;根据经济增长理论,农业经济的增长来源于生产要素的投入和农业生产率的提高,依靠技术创新提高农业效益是可行的;依靠农业产业化不是解决"三农"问题的关键,却是农业良性发展的必由之路。     

“产品导向,任务驱动式”教学模式的探索与实践

加大课程建设与改革力度,增强学生的职业能力,提高高等职业教育教学质量,是各高职院校教学工作的重中之重。肉制品生产课程是高职院校食品加工技术专业的专业课之一,是一门理论和实践紧密联系,培养学生职业能力的专业课程。本课程总体改革思路是紧扣食品加工技术专业的人才培养目标,尝试进行以＂产品导向,任务驱动＂为教学模式的课程设计。     

"焦大牌"磷酸二氢钾在大豆上的施用效果

进行了"焦大"磷酸二氢钾在大豆上的应用效果试验,结果表明其可以促进大豆健壮生长,增加单株荚数、单株粒数,提高结实率,增加产量。以鼓粒期喷施1 500 g/hm2增产效果最好,较对照增产5.10%。     

喷施“金得乐”对玉米生长发育及产量的影响

以5个玉米品种为试验材料,以“金得乐”玉米蹲苗化控增产剂为供试药剂,研究喷施药剂后对玉米株高、穗位、倒伏（折）程度和产量的影响。结果表明：喷施“金得乐”能不同程度地降低玉米的株高和穗位,提高部分品种的抗倒伏（折）能力,玉米产量均有不同程度的降低,但不同的玉米品种受影响的程度不同,品种间差异显著。     

Comment on "Tequila, a neurotrypsin ortholog, regulates long-term memory formation in Drosophila"

Didelot et al. (Reports, 11 August 2006, p. 851) claimed that Drosophila Tequila (Teq) and human neurotrypsin are orthologs and concluded that deficient long-term memory after Teq inactivation indicates that neurotrypsin plays its essential role for human cognitive functions through a similar mechanism. Our analyses suggest that Teq and neurotrypsin are not orthologous, leading us to question their equivalent roles in higher brain function.     

绿野种衣剂处理花生、西瓜、甜瓜、辣椒种子的效果

室内研究结果表明:用20%绿野种衣剂处理花生种子(药种比1∶50)、18%绿野种衣剂处理辣椒种子(药种比1∶40)和甜瓜种子(药种比1∶50)、用15%绿野种衣剂处理西瓜种子(药种比1∶50)可以获得最佳效果,处理种子的发芽率、发芽指数和活力指数均较对照有所增加。     

Comment on "On the regulation of populations of mammals, birds, fish, and insects" III

Stochasticity in time series explains concave responses of per capita growth rate to population size. The gradients with the natural log of population size have more biological importance because they measure strength of density compensation. Its weakening with increasing body size across taxa (Sibly et al., Reports, 22 July 2005, p. 607) is consistent with slower responses in ascent than descent toward carrying capacity. Time series therefore suggest that populations of large-bodied animals underfill their environments.     

Comment on "On the regulation of populations of mammals, birds, fish, and insects" I

Sibly et al. (Reports, 22 July 2005, p. 607) concluded that density dependence acts far below the carrying capacity in most animal populations. We argue that the authors confused discrete and continuous models, that their best-fit models cannot explain observed oscillations, and that their estimation procedures appear biased. They also neglected trophic and migratory processes, which we demonstrate could underlie their empirical findings.     

Comment on "On the regulation of populations of mammals, birds, fish, and insects" II

Sibly et al. (Reports, 22 July 2005, p. 607) recently estimated the relationship between population size and growth rate for 1780 time series of various species. I explain why some aspects of their analysis are questionable and, therefore, why their results and estimation procedure should be used with care.     

Comment on "On the regulation of populations of mammals, birds, fish, and insects" IV

Sibly et al.'s (Reports, 22 July 2005, p. 607) contention that density dependence acts strongly on low-density animal populations irrespective of body size contradicts many long-term studies of large mammals. Their findings were distorted by harvest records, which may poorly reflect population trend. Omitting unreliable data, their massive data set is reduced to only one case for large mammals.