Results 61 to 70 of about 847,212 (208)
, 1985 藻类种群之间的相互作用是调节群落组成和演替的生物学因素。它往往是通过胞外活性物质调控其它藻类或生物类群生长、代谢的潜在生物学途径。蓝藻是水、土等生态系统中的重要成员，因此，对蓝藻不同种群之间相互作用的研究是十分重要的。为了了解蓝藻种群之间的相互关系，作者选取了两种固氮蓝藻Anabaena variabilis 1058和Tolypothrix tenuis在实验室条件下进行实验。在混合培养条件下，T. tenuis和A.
刘世枚
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Oral interaction plays a facilitative role in second language acquisition. While numerous studies have explored adult learners’ interactions, research that has examined young learners’ interactions, especially among Chinese as a second language learners (CSLs), is lacking. This study focused on CSLs and Chinese‐speaking students (CSSs) in Hong
Jing Yan
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2015 目的观察不同时期、不同亚型偏头痛患者血浆中过氧化物酶体增殖物激活受体（PPARs）的变化,探讨偏头痛的发病机制。方法将227例偏头痛患者分成偏头痛发作期组（A组,n=98）和发作间期组（B组,n=129）;同时根据患者先兆症状的不同又分为四个亚组,即A1组-无先兆的偏头痛发作期患者（n=71）,A2组-有先兆的偏头痛发作期患者（n=27）;B1组-无先兆的偏头痛发作间期患者（n=94）,B2组-有先兆的偏头痛发作间期患者（n=35）;以年龄、性别相匹配的100例健康者作为对照组。搜集患者的临床资料（性别、
张贺敏 +4 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT In this study, control–value theory (CVT) was used to investigate how students’ perceptions of the classroom environment shape their anxiety in the context of English as a foreign language (EFL) learning through the mediating effects of control and intrinsic value appraisals.
Quan Qian, Xianhan Huang
wiley +1 more source
Gaoya dianqi, 1983 本文在分析了液压机构电磁阀动作原理的基础上,导出了它的动作时间的计算式,并以实例进行了验证。文章还分析了影响电磁阀动作时间的因素,提出了缩减动作时间的简单而有效的方法,并进行了试验研究。
施文耀
doaj
不同滴灌带布设方式对苹果-大豆间作系统土壤化感物质与微生物的影响
Shuitu Baochi Xuebao, 2023 为探究不同滴灌带布设方式对果农间作系统土壤酚酸类物质、酶活性和微生物分布特性影响,初步探明间作滴灌条件下,土壤酚酸类物质与土壤生物因子的相互关系。以晋西黄土区典型的苹果-大豆间作系统为研究对象,设置3种(L1、L2、L3)滴灌带间距,分析不同水分分布下土壤酚酸类物质、酶活性和微生物数量的空间分布变化,并在相关性基础上利用逐步回归模型,分析3个土壤因子之间的相互关系。结果表明:除苯甲酸和间苯三酚外,滴灌带间距对酚酸类物质分布影响显著 ...
王鑫 +7 more
doaj
Exploring English Language Learners’ Vocabulary Knowledge and Usage When Speaking
International Journal of Applied Linguistics, EarlyView.ABSTRACT Vocabulary forms a fundamental component of speaking ability, as it enables speakers to convey meaning accurately, fluently, and effectively. Although the relationship between vocabulary and speaking has been investigated to some extent, gaps remain in understanding the link between learners’ vocabulary knowledge and their speaking proficiency,
Junyan Guo, Martin East
wiley +1 more source
腺苷A2A受体阻断剂SCH58261对大鼠杏仁核点燃癫痫模型的影响
Zhongguo shiyan zhenduanxue, 2015 目的研究腺苷A2A受体阻断剂SCH58261对大鼠杏仁核点燃癫痫模型的作用。方法制作杏仁核电刺激模型。点燃成功后的大鼠,通过腹腔给药的方法,观察SCH58261对模型成功后各发作参数的作用。整个实验过程中,严密观察药物对大鼠行为学的影响。结果在成功点燃的癫痫模型中,SCH58261（0.005,0.05,0.5mg/kg）对全面性发作阈值（GST）没有影响。以GST（+4μA）为刺激强度,SCH58261（0.005,0.05mg/kg）可以降低杏仁核后放电时间（ADD）,运动性发作持续时间（MSD ...
李巷 +5 more
doaj
Co‐Teaching in a Virtual Intensive Study Language Programme: Insights From Team Ethnography
International Journal of Applied Linguistics, EarlyView.ABSTRACT As virtual study abroad becomes an increasingly important form of international education, little is known about how transnational teaching is organised and sustained across institutions. Using activity theory as an analytical framework and team ethnography as methodology, this study examines a virtual intensive study (VIS) programme delivered
Zhu Hua +7 more
wiley +1 more source