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STUDIES ON THE BIOSYNTHESIS OF COLLAGEN : I. THE GROWTH OF FOWL OSTEOBLASTS AND THE FORMATION OF COLLAGEN IN TISSUE CULTURE 总被引:5,自引:2,他引:5 下载免费PDF全文
1. A tissue culture method was devised in which suspensions of osteoblasts, obtained directly from frontal bones of fowl embryos, were grown in a fluid, fibrin-free medium. 2. Maximum growth of the tissue, as measured by dry weight, with the formation of collagen protein, based on the estimation of hydroxyproline, was obtained in periods of up to 6 days. 3. Appreciable amounts of protein-bound hydroxyproline were formed during the first 24 hour growth period, but electron microscopy of portions of the same cultures failed to demonstrate the presence of any typical collagen fibrils. 4. The subsequent formation of many characteristic collagen fibrils was not associated with a significant rise in the mean hydroxyproline content of the tissue. 5. The cytoplasmic granules of the osteoblasts stained intensely with the P.A.S. technique when the collagen fibrils were being formed. 6. It is suggested that collagen-forming cells synthesise and secrete a hydroxyproline-rich precursor of protein or large peptide nature, which subsequently becomes directly transformed into typical collagen fibrils. 相似文献
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COLLAGEN BIOSYNTHESIS : TISSUE CULTURE EXPERIMENTS TO ASCERTAIN THE ROLE OF ASCORBIC ACID IN COLLAGEN FORMATION 总被引:3,自引:2,他引:1 下载免费PDF全文
Quantitative studies of collagen formation by chick embryonic lung tissue grown in media deficient in, or completely lacking, ascorbic acid have been carried out. Cell growth and collagen formation in such cultures can proceed almost normally in media lacking ascorbic acid. Ascorbic acid in combination with whole embryo extract, dialyzed media, or synthetic mixture number 703 was found to have no appreciable effect on cell growth or total collagen formation. This is in marked contrast to the almost total failure of collagen formation in scorbutic animals and suggests that for slow collagen biosynthesis as distinct from more prolific collagen-producing systems, ascorbic acid plays an indirect role. 相似文献
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本文详细报道了从秃杉(Taiwania flousiana Gaussen)离体胚诱导不定芽、不定根及从无菌苗茎端培养再生植株的过程。诱导不定芽要求较低的蔗糖浓度(以3%最好);同时BA是必须的,在附加0.1—3 mg/1 BA的White培养基上,从离体胚的子叶或胚轴上诱导了不定芽的发生(以1 mg/1最好);NAA与BA结合使用,对不定芽诱导无促进作用;适当提高光照有利于不定芽的诱导。在诱导不定芽的同时,在子叶表面还观察到有许多无结构的“不定突起”。不定芽起源于子叶表皮下1—2层细胞。IBA对诱导离体胚上产生不定根效果较好。在有或无生长素的培养基上,从生长1月龄的无菌苗茎端培养获得了不定根的产生,在加有细胞分裂索的培养基上,从无菌苗上产生了腋芽。 相似文献
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槐树组织细胞培养的研究 总被引:10,自引:0,他引:10
系统研究了槐树叶片、子叶及花药的培养方法和植株再生,获得了大量的试管苗,建立了槐树二倍体和单倍体植株快速繁殖的培养程序。实验表明在MS附加高浓度比值BA/IBA或2,4-D的培养基中可诱导各种外植体在短期内产生大量的不定芽和试管苗,但同时,又诱导产生了许多超度含水态苗。在培养过程中,BA浓度先高后低,既可获得大量的试管苗,又相对降低了超度含水态苗的比率,是槐树快速繁殖程序中的重要一环。组织学观察显示,槐树子叶切块培养中形成的胚状体来自于子叶的表皮及叶肉细胞,通过单细胞起源和多细胞出芽两种方式产生。 相似文献
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鹤望兰组织培养与工厂化快繁程序的研究 总被引:8,自引:0,他引:8
将材料接种于诱导愈伤组织手芽的培养基上,培养2个月后,胚芽外植体下出现白色颗粒状的愈伤组织,4个月后愈伤组织上出现小芽丛。将小芽丛转入不加植物激素的MS培养基上,芽的生长加快,2个月左右可长成3-6cm高的丛小植株。将小植株切下,插入根培养基中,一般35d左右基部突出很小的白色根尖。 相似文献
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STUDIES ON THE INTRACELLULAR DIGESTIVE PROCESS IN MAMMALIAN TISSUE CULTURE CELLS 总被引:1,自引:0,他引:1 下载免费PDF全文
DNA-protein coacervates containing colloidal gold particles were readily phagocytized by strain L fibroblasts. During the subsequent digestion process, the gold particles served as markers which permitted the demonstration of the evolution of digestive vacuoles to multivesicular bodies and finally to dense bodies. Acid phosphatase and esterolytic activity was present in these structures. The hydrolytic enzymes were apparently brought to the phagocytotic vacuoles in small vesicles originating in the Golgi region. These vesicles entered the vacuoles prior to the digestion of the coacervates and the appearance of positive cytochemical reactions. The cytoplasmic dense bodies frequently merged with the phagocytotic vacuoles. This was demonstrated by prelabeling the dense bodies with colloidal iron prior to phagocytosis of the coacervates. In addition, evidence is presented for the interrelationship of the phagocytotic and autophagic pathways. 相似文献
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小麦幼穗的组织培养及愈伤组织的分化研究 总被引:2,自引:0,他引:2
对普通小麦“津丰-55”的幼穗进行了组织培养,并跟踪研究了培养基中生长素、细胞分裂素、蔗糖、Ag~+以及一些维生素等附加成分对愈伤组织的生长、根苗分化的影响。对愈伤组织再生植株的途径也进行了研究。 相似文献
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K. A. MICZYNSKI 《The Annals of applied biology》1960,48(4):739-741
Extracts from tobacco tissue cultures infected with tobacco mosaic virus grown in medium containing antiserum to the virus had only one-half to one-sixteenth as much virus as extracts from tissues grown in medium without the antiserum. When tissues grown with antiserum were thoroughly washed before they were extracted, the extracts contained as much virus as extracts of tissues grown without antiserum. The antiserum did not affect virus multiplication, but antibodies in the tissues may have precipitated virus either in the cells or when the tissues were macerated. 相似文献
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Abstract— The distribution of [14 C]labelled material into subcellular fractions of 30-day-old rat brain was studied as a function of time, following intracerebral injection of [2-14 C] mevalonic acid. As in the adult and 15-day-old brain, the microsomal fraction was indicated as the site of sterol synthesis. Unlike the 15-day-old animal, the myelin fraction from the 30-day-old rat was the predominately labelled fraction at 2 weeks after injection of the animal. Significant amounts of [14 C]cholesterol were not present until about 4 h after injection. In order to ascertain whether different populations of cholesterol were being labelled, depending on the age of the animal injected, we compared the labelling of myelin and non-myelin components in animals injected at 15 or at 30 days of age, and sacrificed, respectively, from 14 to 29 days or from 1 to 28 days after injection. Our results indicated that there was an apparent shift of labelled sterol from non-myelin to myelin fractions at about 37–44 days of age. 相似文献
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MIMI TAMAMORI HIROSHI ITO MICHIAKI HIROE FUMIAKI MARUMO RYU-ICHIRO HATA 《Cell biology international》1997,21(3):175-180
Synthesis of type I and type III collagens by rat cardiac fibroblasts was stimulated when the cells were cultured under 95% N2/5% CO2for one hour followed by incubation under normoxic conditions for 24 hours. The stimulative effect was attenutated by the presence of atrial natriuretic peptide (ANP, 10−6m) or brain natriuretic peptide (BNP, 10−6m) in the culture medium. Northern blot analysis indicated that α1(I) and α1(III) collagen mRNA levels were also increased by hypoxia, and decreased with the addition of ANP or BNP in a dose-dependent manner. These results indicate interaction between intracellular signals of a physical stimulus (hypoxic stress) and those of a chemical one (ANP or BNP) and demonstrate that both signals regulate collagen synthesis by cardiac fibroblasts at the levels of the mRNAs. The results also suggest that natriuretic peptides produced by cardiomyocytesin vivomay function as paracrine factors that play a role in the prevention of cardiac fibrosis in ischaemic heart diseases. 相似文献
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槐树子叶组织培养中的形态发生研究 总被引:1,自引:0,他引:1
槐树子叶在MS附加0.1~5 mg/L BA 和0.1—5 mg/L 2,4-D的培养丛上培养两周,获得了灰色疏松型及白、绿色紧密型两种类型的愈伤组织。后者经培养产生不定芽并再生植株。子叶切块在MS 附加0.1~8 mg/L 2,4-D等培养基上培养3周,在切口处形成愈伤组织的同时,由其表面直接分化产生胚状体。组织学观察表明,胚状体来源于子叶的表皮及叶肉细胞,胚状体产生通过单细胞起源及多细胞出芽两种方式发生。胚状体发育依次通过球形胚、心形胚、鱼雷形胚和子叶胚等阶段形成再生植株,其发育过程与合子胚相似。 相似文献
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