浅谈如何培养和提高学生英语阅读理解的能力     

崔贞玉 《林业科技情报》2011,(4):110-111

在大学英语教学过程中,培养和提高学生英语的阅读理解能力是非常重要的环节,但笔者在教学中发现：大多数学生的阅读能力都比较薄弱。针对这种普遍现象,作为大学英语教师应该积极探索解决方法,充分利用精读课、泛读课及选择合适的阅读材料等来激发学生阅读的兴趣,以达到快速提高英语水平的目的。  相似文献   

Growth,Survivorship, Air‐bubble Disease,and Attachment of Feeble Juvenile Seahorses,Hippocampus kuda (Bleeker, 1852)          下载免费PDF全文

Yanhong Zhang  Geng Qin  Junda Lin  Qiang Lin 《Journal of the World Aquaculture Society》2015,46(3):292-300

Seahorse aquaculture has been a focus for meeting the demand of traditional medicine and aquarium. Feeble (poor quality) juveniles are commonly found in the commercial seahorse culture. In this study, we compared the growth and survival performances of the feeble and healthy common seahorses Hippocampus kuda. The results show that the feeble juveniles had high growth and survival at the temperature of 27–29 C and salinity of 26–28‰ with frequent feeding (≥three times a day) during first 5 wk. Through a 12‐wk investigation, we found that the air‐bubble disease could significantly affect the specific growth rate and survival of the feeble juveniles. There was a positive and significant correlation between the substrate‐attachment rate and survival rate in the feeble juveniles, and substrate‐attachment rate may be used to assess the quality of the feeble populations in the seahorse H. kuda.  相似文献   

Gene flow from glufosinate-resistant transgenic hybrid rice Xiang 125S/Bar68-1 to weedy rice and cultivated rice under different experimental designs     

Guanghui Sun  Weimin Dai  Rongrong Cui  Sheng Qiang  Xiaoling Song 《Euphytica》2015,204(1):211-227

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经络穴位给药系统在兽医临床上的应用   总被引：1，自引：0，他引：1  

吴帅成  宋舟  张翠  秦倩倩  谢闪闪  张长帅  付本懂  韦旭斌  申海清 《动物医学进展》2011,32(7):109-112

经络穴位给药系统以中医经络理论为基础,具有经穴效应和药物效应的双重治疗特性,已广泛应用于兽医临床.目前,兽医临床上常用穴位给药方式是穴位埋植和穴位注射,而常用穴位主要是后海穴、百会穴、肺龠穴.随着经络穴位给药系统的广泛应用,新型经络穴位给药制剂和经络穴位给药作用机理已成为经络穴位给药系统研究的重点.  相似文献   

麦棉套种对预留棉行光合有效辐射的影响   总被引：4，自引：0，他引：4  

潘学标  邓绍华  王延琴  崔秀稳  董占山 《棉花学报》1994,(2)

对东西行向、预留棉行为１００ｃｍ的三二式麦棉套种方式研究表明，在小麦抽穗后的麦棉共生期间，预留棉行上的平均光合有效辐射仅为一熟棉田的５０％～８０％，株高低和叶片枯黄时光照削弱较小；在麦棉间距相同的情况下，北行棉花接受的ＰＰＦＤ较多，而正午前后南行棉花易受荫蔽，南行棉花适当北移，保持麦棉间距在３０ｃｍ以上，降低小麦群体株高，防止小麦旺长，起垄种棉，都有利于棉花生长发育。  相似文献   

雏鸭重组禽流感（H5+H7）三价灭活苗母源抗体消长规律     

覃艳然  王翠  梁竞臻  韦钰  王敏  刘佳佳  谢艳林  蒙文娟  严斯刚  黄小武 《中国动物检疫》2021,38(6):97-101

为探究雏鸭重组禽流感(H5+H7)三价灭活苗母源抗体消长规律,确定最佳首免日龄,将试验分为A组(种鸭免疫H5N1 Re-11+Re-12株、H7N9 H7-Re-2株、H5N2疫苗)和B组(种鸭免疫H5N2 rSD57株+rFJ56株、H7N9 rGD76株疫苗);选其孵化后的雏鸭各300羽,分别于1、7、14、21、28日龄时采血,每组随机采集100份样品,通过血凝(HA)和血凝抑制(HI)试验进行禽流感母源抗体检测。结果显示:两组各亚型母源抗体在1日龄时平均滴度均达最高水平( 7.27log2),且离散程度低( 0.22)。两组雏鸭的禽流感母源抗体阳性率均随日龄增长而逐渐下降,7日龄时,平均滴度在4.26log2以上,群体抗体阳性率在76%以上,其中B组阳性率略高于A组;14日龄时,平均滴度都下降到2.55log2以下,群体抗体阳性率下降到25%以下;21日龄时,平均滴度均在0.43log2以下,群体抗体阳性率下降至1%以下。结果表明,高抗体水平种鸭能够使后代雏鸭具有较高水平的禽流感母源抗体,但母源抗体保护时间较短,重组禽流感(H5+H7)三价灭活苗的最佳首免时间为7～14日龄。本研究为鸭禽流感疫苗免疫策略制定提供了参考。  相似文献   

部分商品化非洲猪瘟病毒荧光PCR检测试剂盒的比对     

崔基贤  南文龙  高原  兰德松  于本良  顾贵波 《中国动物检疫》2021,38(8):79-84

为获得商品化非洲猪瘟病毒(ASFV)荧光PCR检测试剂盒的敏感性、特异性、一致性和最低检测限等试验数据,以世界动物卫生组织(OIE)推荐引物探针为金标准,以62份已灭活的ASFV阳性田间样品、32份阴性田间样品和P72基因核酸标准物质为检测对象,对农业农村部公布许可的其中17个厂家生产的商品化ASFV荧光PCR检测试剂盒开展了试验特性方面的比对研究。结果显示,17个厂家生产试剂盒的敏感性最低为77.4%,最高为96.8%,特异性最低为87.5%,最高为96.8%,均未达到100%,且有一定差别;12个厂家的试剂盒与OIE推荐引物探针检测结果一致性较好(Kappa值≥0.75),其余5个厂家的试剂盒与其一致性一般(0.4Kappa值0.75);17个厂家的试剂盒均可检测到的最低稀释度为5.9×10~3×2~(-3)拷贝/μL,但不同厂家试剂盒的最低检测限有所差别,其中5个试剂盒可检测到的最低稀释度为5.9×10~3×2~(-3)拷贝/μL,2个试剂盒为5.9×10~3×2~(-4)拷贝/μL,6个试剂盒为5.9×10~3×2~(-5)拷贝/μL,3个试剂盒为5.9×10~3×2~(-6)拷贝/μL,1个试剂盒至少为5.9×10~3×2~(-7),且大部分国产试剂盒的最低检测限比进口试剂盒低。本研究为ASFV荧光PCR检测试剂盒的筛选和比对提供了参考数据。  相似文献   

Effects of dietary supplementation of nucleotides from late gestation to lactation on the performance and oxidative stress status of sows and their offspring     

Chengquan Tan  Yongcheng Ji  Xichen Zhao  Zhongquan Xin  Jiaying Li  Shuangbo Huang  Zhiying Cui  Lijun Wen  Caihua Liu  Sung Woo Kim  Jinping Deng  Yulong Yin 《动物营养（英文）》2021,7(1):111

Increased metabolic burdens in breeding sows, which are induced by elevated systemic oxidative stress, could increase the need for nucleotides to repair lymphocyte DNA damage; however, de novo synthesis of nucleotides may be insufficient to cover this increased need. This study investigated the effects of dietary nucleotides on milk composition, oxidative stress status, and the reproductive and lactational performance of sows. Forty multiparous sows were assigned to 2 dietary treatments (Control group, and 1 g/kg Nucleotides group) based on a randomized complete block design using their BW at 85 d of gestation as a block. Sows from 2 groups were fed a restricted diet during gestation and ad libitum during lactation. The experiment lasted from 85 d of gestation to 21 d of lactation. The reproductive performance of sows and the growth performance of suckling piglets were measured. Oxidative stress parameters and milk components were also analysed. Data were analyzed using contrasts in the MIXED procedure of SAS. Sows in the Nucleotides group consumed more feed during the first week (P < 0.01) and from 1 to 21 d (P < 0.05) of lactation than those in Control group. Correspondingly, the litter weight gain of piglets showed a tendency to increase from cross-fostering to 9 d (P = 0.09) and from cross-fostering to 20 d (P = 0.10) in the Nucleotides group relative to the Control group. Additionally, the Nucleotides group was higher (P < 0.01) than the Control group in the concentrations of uridine 5''monophosphate, guanosine 5''monophosphate, inosine 5''monophosphate, adenosine 5''monophosphate and total nucleotides in milk. Furthermore, the Nucleotides group was higher (P < 0.01) than the Control group in the serum levels of total antioxidant capacity (P < 0.01) for sows at 109 d of gestation and glutathione peroxidase for weaning piglets, but lower at the levels of thiobarbituric acid-reactive substances (P < 0.05) in serum of weaning piglets. This study indicated that maternal dietary nucleotides could promote piglet growth, probably due to the higher lactational feed intake and higher concentration of nucleotides in the milk of sows, and lower oxidative stress for both sows and piglets.  相似文献   

高产棉花太阳辐射能利用率及干物质分配规律研究   总被引：6，自引：0，他引：6  

潘学标  邓绍华  蒋国柱  吴同礼  董占山  崔秀稳  潘晓康  龙腾芳 《棉花学报》1992,(Z1)

通过对1988～1989年高产棉花栽培试验结果进行分析发现,棉花的太阳辐射利用率在叶面积系数小于2.0时随叶面积系数的增加而线性增加,大于2.0时增加变缓。从生育时间看,7月中旬前太阳辐射利用率指数上升,7月中旬至8月底相对稳定在1.2～1.4克/兆焦左右,9月以后又不同程度线性下降。生长季内子棉太阳辐射经济效率1988和1989年分别为0.14和0.15克/兆焦。收获指数与最大叶面积系数呈显著负相关;盛花期之前棉株各器官之间的同伸关系或明显,盛花期后器官的生长相互间无明显的确定性关系。如能调节密度与叶面积系数的关系,使得既提高5～6月的辐射能利用率,同时使7～8月叶面积系数维持在3.0～3.5的适宜范围内,9～10月群体又不早衰,则有利于获得高产。  相似文献   

非充分灌溉条件下水稻生长发育及生理机制研究   总被引：1，自引：0，他引：1  

张明炷  李远华  崔远来  武兰春  方荣杰 《灌溉排水学报》1994,(4)

本文以水稻非充分灌溉试验的大量实测资料为基础，分析了水分胁迫对水稻主要形态指标、生理机制及产量的影响，对非充分灌溉条件下水稻所持有的生理机制进行了较细致的研究。研究结果对于指导有效、省水的稻田灌溉具有重要意义。  相似文献