共查询到15条相似文献,搜索用时 140 毫秒
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西大桥引水枢纽是阿克苏河上的重要的闸门之一。一条十几米宽的河被五条宽窄不同的渠道把水引向不同的灌区.有地方的有兵团的,另有一个通向天然河道的闸门。“生产要先够了.才能下泄生态水。”水管站负责人说。 相似文献
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何自举,今年58岁,是农二师35团16连的职工.看泵站已经6年了。这个泵站就是兵团人现在的“活命水”的通道。水从30公里外的新北山上通过管道直接引下来,供应34.35团地区饮用。 相似文献
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来到塔河中游.河床依然是干的,大片新开的棉田靠的是井水灌溉。据我们了解,中游打井也只是近三四年才开始的。随着塔河水愈来愈紧张.井的规模和数量也急剧增加。 相似文献
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一、序真核细胞的进化伴随着细胞的结构体制较大的变化。和它们的原核祖先相比较,真核细胞具有更复杂的细胞膜排列,各式各样的不对称的细胞形状,许多新的分泌、运动以及细胞内运送的系统,和遗传物质分离的新方法。这些进展中有许多可能紧紧地依赖着微管的进化,微管实际上是在所有真核生物的生活周期或发育史的某个时候在其细胞里找到的一种用途异常多的蛋白质聚合体。微管是真核生物所独有的并普 相似文献
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《生物学通报》1955,(6)
问:在植物学84页的图54小麦的花中2鳞被在雄蕊下,我们在观察小麦花的构造时鳞被的所在部位与图的部位有所不同,是在单一雄蕊的两侧,希望,把小麦花的构造情况详细的给我们写来才好.答:植物学教科书84页的小麦花的构造是不正确的,再版时,一定要改换。小麦花的构造是这样的:外稃内稃各一片,套合着生长,像肥皂盒似的,外稃扣在内稃的外面。如果是有芒的花,芒长在外稃上。在这两面稃片里面,包藏着浆片[书上叫鳞被]两个;雄蕊三枚;雌蕊一枚,柱头两个,上面生有羽状分枝。这两个浆片相当花被,它们长在靠近外稃的那面。你观察的很正确,正对着外稃有一个雄蕊两个浆片生在这一个雄蕊的两侧;也就是说,有一个雄蕊是在两个浆片之间生长着的。(徐晋铭答) 相似文献
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2009年春,我们来到塔里木河下游的尾端.这条我国最大的内陆坷在即将走完它里程的时候,完全失去了浩荡的气质,狭窄的河床蜿蜒在沙丘里,仅剩下几米宽河床里有的仅是干透了的泥沙. 相似文献
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《Arts Education Policy Review》2013,114(3):55-64
Policy for early childhood music education (birth to eight years of age) in Australia covers a complex and diverse range of curriculum guidelines and legislation relating to the contexts of day care, preschool, and the early years of school. Australian models and policies vary from state to state and according to setting. Furthermore, early childhood education is constantly changing and evolving, responding to new practices, altered government priorities and funding, and community needs. In this article, the author aims to provide a snapshot of the situation by reviewing and analyzing educational policies, teacher training, and providers of early childhood music programs as well as suggesting some future directions. 相似文献
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Recent studies of mammalian genomes have uncovered the extent of copy number variation (CNV) that contributes to phenotypic diversity, including health and disease status. Here we report a first account of CNVs in the pig genome covering part of the chromosomes 4, 7, 14, and 17 already sequenced and assembled. A custom tiling oligonucleotide array was used with a median probe spacing of 409 bp for screening 12 unrelated Duroc boars that are founders of a large family material. After a strict CNV calling pipeline, 37 copy number variable regions (CNVRs) across all four chromosomes were identified, with five CNVRs overlapping segmental duplications, three overlapping pig unigenes and one overlapping a RefSeq pig mRNA. This CNV snapshot analysis is the first of its kind in the porcine genome and constitutes the basis for a better understanding of porcine phenotypes and genotypes with the prospect of identifying important economic traits. 相似文献
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Chengcheng Liao Qian Wang Jiaxing An Qian Long Hui Wang Meiling Xiang Mingli Xiang Yujie Zhao Yulin Liu Jianguo Liu Xiaoyan Guan 《International journal of biological sciences》2021,17(12):3036
In the process of cancer EMT, some subgroups of cancer cells simultaneously exhibit both mesenchymal and epithelial characteristics, a phenomenon termed partial EMT (pEMT). pEMT is a plastic state in which cells coexpress epithelial and mesenchymal markers. In squamous cell carcinoma (SCC), pEMT is regulated, and the phenotype is maintained via the HIPPO pathway, NOTCH pathway and TGF-β pathways and by microRNAs, lncRNAs and the cancer microenvironment (CME); thus, SCC exhibits aggressive tumorigenic properties and high stemness, which leads collective migration and therapy resistance. Few studies have reported therapeutic interventions to address cells that have undergone pEMT, and this approach may be an effective way to inhibit the plasticity, drug resistance and metastatic potential of SCC. 相似文献