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131.
132.
蔷薇科植物体细胞胚胎发生及影响因素研究进展 总被引:1,自引:0,他引:1
总结了近30年来蔷薇科植物体细胞胚胎发生及影响因素的研究进展。蔷薇科植物体胚发生多数是直接发生途径和间接发生途径同时存在,但以间接发生途径为主。合子胚作为外植体明显好于营养器官作为外植体。诱导体胚发生的植物生长素类调节剂以NAA、2,4-D为主,细胞分裂素类调节剂以6-BA为主,少数植物种类的体胚诱导需要添加KT。冷处理对蔷薇科植物的体胚分化有效。光照对蔷薇科植物的体胚发生没有显著的影响,有时光照会抑制体胚发生。今后应逐步开展对蔷薇科植物体细胞胚胎发生的生理、生化及分子机理的研究,这在蔷薇科植物的新品种培育、遗传改良、优良单株的离体扩殖等具有重要意义。 相似文献
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Rumi Zhang Peiyu Zhang Colin Dalton Graham A. Jullien 《Biomechanics and modeling in mechanobiology》2010,9(1):77-86
In this paper, we apply mixture theory to quantitatively predict the transient behavior of drug delivery by using a microneedle
array inserted into tissue. In the framework of mixture theory, biological tissue is treated as a multi-phase fluid saturated
porous medium, where the mathematical behavior of the tissue is characterized by the conservation equations of multi-phase
models. Drug delivery by microneedle array imposes additional requirements on the simulation procedures, including drug absorption
by the blood capillaries and tissue cells, as well as a moving interface along its flowing pathway. The contribution of this
paper is to combine mixture theory with the moving mesh methods in modeling the transient behavior of drug delivery into tissue.
Numerical simulations are provided to obtain drug concentration distributions into tissues and capillaries. 相似文献
136.
DNA methylation changes in photoperiod-thermo-sensitive male sterile rice PA64S under two different conditions 总被引:1,自引:0,他引:1
Epigenetic modification can occur at a high frequency in crop plants and might generate phenotypic variation without changes in DNA sequences. DNA methylation is an important epigenetic modification that may contribute to environmentally-induced phenotypic variations by regulating gene expression. Rice Photoperiod-Thermo-Sensitive Genic Male Sterile (PTGMS) lines can transform from sterility to fertility under lower temperatures and short-day (SD) conditions during anther development. So far, little is known about the DNA methylation variation of PTGMS throughout the genome in rice. In this study, we investigated DNA cytosine methylation alterations in the young panicles of PTGMS line PA64S under two different conditions using methylation sensitive amplified polymorphism (MSAP) method. Compared with the DNA methylation level of PA64S under lower temperatures and SD conditions (fertility), higher methylation was observed in PA64S (sterility). The sequences of 25 differentially amplified fragments were successfully obtained and annotated. Three methylated fragments, which are homologous to D2, NAD7 and psaA, were confirmed by bisulfite sequencing and their expression levels were also evaluated by qPCR. Real time quantitative PCR analysis revealed that five of the six selected methylated genes were downregulated in PA64S (sterility). These results suggested that DNA methylation may be involved in the sterility–fertility transition of PA64S under two different environmental conditions. 相似文献
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Zhang Y Meng Q Jiang T Wang H Xie L Zhang R 《Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology》2003,135(1):43-54
Iron is one of the most important minor elements in the shell of bivalves. This study was designed to investigate the involvement of ferritin, the principal protein for iron storage, in shell formation. A novel ferritin cDNA from the pearl oyster (Pinctada fucata) was isolated and characterized. The ferritin cDNA encodes a 206 amino acid polypeptide, which shares high similarity with snail soma ferritin and the H-chains of mammalian ferritins. Oyster ferritin mRNA shows the highest level of expression in the mantle, the organ for shell formation. In situ hybridization analysis revealed that oyster ferritin mRNA is expressed at the highest level at the mantle fold, a region essential for metal accumulation and contributes to metal incorporation into the shell. Taken together, these results suggest that ferritin is involved in shell formation by iron storage. The identification and characterization of oyster ferritin also helps to further understand the structural and functional properties of molluscan ferritins. 相似文献