大花君子兰的胚培养及其胚状体的诱导

大花君子兰幼胚培养,其胚状体采用MS培养基(其中大量元素减半),附加ZT1毫克/升,NAA0.2毫克/升,IAA0.2毫克/升,蔗糖1.5％、琼脂0.65％、pH5.8％,在温度25±1℃、光照1200 Lx(10小时/天)下培养20天后即诱导出芽,然后转入壮苗发根培养基:MS培养基(其中大量元素减半)、附加BA0.05毫克/升、IBA0.2毫克/升、IAA0.6毫克/升,蔗糖、琼脂、pH及培养条件同上。培养三个星期后即长出叶片并发根2—3条。将试管苗鳞茎状部分切成0.5—1 cm见方的小块,接入壮苗发根培养基中,经2—3次(每次20天)继代培养形成8—9个胚状体,然后移至无激素的MS培养基中培养(培养条件同上),19天后转入壮苗发根培养基中,16天后相继长出根和叶,成为壮苗。最后经炼苗移栽至花盆,成活率可达100％。     

花毛茛植株再生途径的离体调控

花毛茛的叶接种子ＭＳ＋２，４－Ｄｌｍｇ／Ｌ＋ＮＡＡｌ＋６－ＢＡ２的培养基上，３－４周后，形成愈伤组织，将愈伤组织分别转移到ＭＳ＋２，４－Ｄ１－２和ＭＳ＋６－ＢＡ１．５－２．５的培养基上，培养４周左右，从愈伤组织表面通过胚状体发生和不定芽发生两条途径形成植株；而将叶接种于ＭＳ＋６－ＢＡ２＋ＮＡＡ０．２－０．５＋ＬＨ５００的培养基上，则可在叶和叶片的过渡区不经过愈伤组织直接分化出芽并形成植株。     

北京鸭肝脏胚胎发育的显微、超微结构及组织化学研究

对不同孵育期(4～26d)的北京鸭肝脏作了组织学(显微及超微结构)及组织化学研究.在胚胎发育过程中,肝细胞组织化学成分(SDH,ACP,AKP,G6Pase,RNA,DNA,糖原及中性脂肪等)的染色反应逐渐增强;中性脂肪始现于第4天,AKP于第19天出现,其他成分出现于第5至第6天;肝细胞的体积从小到大,最后变小;肝脏结构逐渐由简单变为复杂。     

小麦(Triticum aestiviumL.)成熟胚与其他外植体再生能力的研究

六个品种小麦成熟胚等外植体再生能力的研究表明,不同外植体的再生能力按根尖、幼叶、茎节、幼穗、成熟胚的顺序递增。成熟胚再生能力强,愈伤组织诱导率达90%以上,出苗率可达44%,并且具有材料来源广泛、操作方便、不受季节和发育时期限制等优点,因此是小麦体细胞组织培养的适宜外植休来源。本文对不同外植体再生能力差异产生的原因也进行了分析和讨论。组织学观察表明,本实验所获得的再生植株属于器官发生的类型     

气相色谱法测定鸡胚蛋食品中维生素E

用填充柱气相色谱法测定了鸡胚蛋食品中维生素Ｅ，方法简便，快速，重现性好，最低检出浓度为９４μｇ／Ｌ。     

甲状腺素对雏鸡肝糖原、肌糖原及肝脏脂肪含量的影响

本试验经过对用外科手术去除了甲状腺的雏鸡进行研究,探讨了甲状腺素对鸡肝糖原和肌糖原含量及肝脏脂肪含量的影响,结果表明:甲状腺素对肝脏和肌肉中糖原含量具有调节作用.     

静电场对小鼠胚胎发育能力的影响

首次报道哺乳动物胚胎经静电场处理后对＂细胞阻滞＂和后期发育能力的影响．结果表明，用静电场处理小鼠体外受精卵和２细胞胚胎时，对克服小鼠＂２细胞阻滞＂无显著影响．处理发育于Ｍ１６＋１００μＭＥＤＴＡ＋输卵管上皮的２细胞胚胎时，显著提高了胚胎的发育能力，最佳处理剂量的囊胚率从４２％提高到６４％，囊胚孵化率从２０％提高到４５％．     

Developmental actions of natriuretic peptides in the brain and skeleton

The concept that atrial natriuretic peptide (ANP) and the closely related peptides BNP and CNP might be involved in the ontogeny of several organ systems emerged in the late 1980s. While many of the reported in vitro actions have not been examined in the context of organ development in vivo, recent studies demonstrate that mice which lack or overexpress natriuretic peptides or receptors exhibit pronounced skeletal growth defects. This article discusses how natriuretic peptides and other factors appear to regulate bone growth as an example of how natriuretic peptides might participate in the ontogeny of other organ systems. Evidence indicating that natriuretic peptides regulate neural development is then reviewed. Natriuretic peptides and receptors exhibit complex expression patterns in the developing nervous system, where they have been shown to act on neural cells as early as at the embryonic neural tube stage. Interestingly, both bone and brain growth appear to utilize primarily CNP and the CNP-specific type B receptor, and perhaps the type C receptor. In vitro data indicate that CNP may act on developing neurons, astrocytes and Schwann cells like a classical growth factor, regulating proliferation, patterning, phenotypic specification, survival and axonal pathfinding. Natriuretic peptides might also have roles in the vascularization of the embryonic brain, establishment of the blood-brain and blood-nerve barriers, and perhaps in nerve regeneration.Received 13 April 2004; received after revision 20 May 2004; accepted 27 May 2004