师生心理契约及其教学论意义

师生心理契约是教师与学生间形成的彼此期望和心理承诺.师生心理契约具有内容的隐蔽性、差异性、动态性,功能的关键性和教师角色的双重性等特征.师生心理契约的建立、维持和强化往往伴随着师生关系的良性循环.心理契约违背会引致双方期望间的矛盾与缺口,这时需要通过澄清信息或重新"谈判"的方式来修复这些矛盾与缺口,从而重建一种良好的师生关系,提高教学质量.     

稻田生态种植模式—一年四熟栽培技术探讨

随着耕地资源、人口、粮食、环境矛盾的不断演化,我国人多地少、钱粮争地的矛盾将日益尖锐,复种多熟是缓解矛盾的有效途径之一.     

福建省龙岩市创建现代国有林场初探

介绍龙岩市国有林场的分布情况、资源状况、经营情况、人员状况和存在问题,对创建现代国有林场的意义、作用和蓝图及创建中的科学规划、体制建设、经济政策、人才建设、制度建设和法律法规保障等问题进行了探讨.     

基于矿山储量动态监测的研究

从资源经济的角度，对矿山储量动态监测的重要性进行评价，讨论了该监测对建立我国矿山企业珍惜和合理利用资源的经济机制，建设资源节约型社会，具有的重要意义。为全国全面开展矿山储量动态监测提供科学借鉴范例。     

新升本科院校图书馆读者的借阅统计与分析——以河池学院为例

通过对读者的借阅数据和馆藏数据进行统计分析,探讨了高校读者的阅读特点,藏书结构对学生的适应性,并对本馆馆藏规划提出了自己的建议。     

柑桔慢衰线虫病在四川的发生危害研究

 对四川省36个柑桔产区324个柑桔园的调查结果表明,柑桔慢衰线虫病 (Tylenchulus semipenetrans)在四川普遍发生,病情趋势是川东部盆地区发生最重,盆周低、中山区次之,川西南干热河谷较轻.果园平均发病率为87.4%,病情Ι级园占35.6%,Ⅱ级占24.6%,Ⅲ级占20.4%,Ⅳ级占6.7%.每年引起的经济损失达2.3%～45%;对18种柑桔品种田间发病情况调查结果:酒饼勒未见发病,香橼、江南柑、曼桔发病较轻,枳对该病抗性表现不一致,其余均严重感病,香橼、江南柑、曼桔发病较轻,枳对该病抗性表现不一致,其余均严重感病;T.semipenetrans田间群体密度周年消长规律研究结果,土中侵染幼虫群体密度以春、秋季最大,夏季最小;根上侵染幼虫群体密度以8月最小,秋、冬最大;而雌成虫全年在根上的发生量均低,而且变动幅度不大.     

西宁地区引种大豆生长发育特性研究

８ａ引种试验结果表明,大豆７９６４５选系在西宁生态条件下生育期平均１１６ｄ。出苗６０ｄ左右茎叶生长速度最快,７０ｄ前后开始结英,８０ｄ左右植株鲜重和干重增长速度最快,９０ｄ左右营养生长量、单株荚果数和物质生产积量均达一生最高值,１００ｄ左右苹果大小基本定型。此后生长急剧减缓渐趋成熟。最高产量达２８９５．１ｋｇ／ｈｍ＾２。     

Seeking improved nutritional properties for the potato: Ethionine-resistant protoclones

Russet Burbank leaf protoplasts were cultured in Shepard’s (1980) cell layer (CL) medium containing the amino acid analog ethionine (ETN), at concentrations ranging from 0 to 6 µM. Repeated counts of viable cells and dividing colonies during the 21 day incubation period permitted calculation of plating efficiencies for each ETN concentration. Plating efficiency was observed to decrease when ETN concentration in CL exceeded 3 µM. Calli which developed were placed on Shepard’s (1980) C media containing ETN concentrations up to 200 µM; however, few calli survived concentrations above 100 µM. Regenerated plants were grown to maturity and resulting tubers were analyzed for free methionine content. Selected protoclones produced tubers with free methionine content as much as 2.66 times that of the Russet Burbank control.     

高产奶牛连续活体采卵及卵母细胞体外受精

在超声波扫描仪的指导下,用双孔型采卵针以 １４．７ ｋ Ｐａ 抽吸压经阴道对 ５ 头高产奶牛分别连续实施 ７ 次活体采卵,每 ７ ｄ １ 次,共采集卵子 ２１４ 个,占可见卵泡数的 ５３．９％ ,每次头均采集卵子 ６．１ 个。卵子经过体外培养、体外受精、体外受精胚体外发育培养,于体外受精后 ４８ ｈ 、１６８ ｈ 统计的卵裂率、囊胚发育率分别为 ７５．２％ 和 ２９．７％ 。研究结果表明,在超声波扫描仪指导下对奶牛连续进行活体采卵是可行的,所得卵子应用体外成熟、体外受精、体外培养技术,可生产用于冷冻或移植的胚胎。     

The chromosomal locations of high crossability genes in tetraploid wheat Triticum turgidum L. cv. Ailanmai native to Sichuan, China

Chromosomal locations of crossability genes in tetraploid wheat Ailanmai with high crossability native to Jianyang of Sichuan province, China, was determined by aneuploid analysis employing the D-genome chromosome substitution lines of Langdon durum wheat and monosomic lines of common wheat, Abbondanza. High crossability of Ailanmai was attributed to recessive crossability alleles on chromosomes 1A, 6A and 7A. The effects of chromosomes 7A and 1A were stronger than chromosome 6A. These results indicated that high crossability in Chinese tetraploid wheat cv. Ailanmai and Chinese hexaploid wheat is controlled by different genetic systems. This revised version was published online in July 2006 with corrections to the Cover Date.