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1.
Cs. Leranth H. Sakamoto N. J. MacLusky M. Shanabrough F. Naftolin 《Histochemistry and cell biology》1985,82(2):165-168
Summary A pre-embedding immunostaining procedure was developed using ferritin and peroxidase to enable simultaneous electron microscopic localization of two antigens in the same tissue section. This method was used to study the anatomic relationship between glutamic acid decarboxylase (GAD) immunoreactive axons and tyrosine hydroxylase (TH) — containing neurons of the rat arcuate nucleus. The findings provide ultrastructural evidence that GAD-immunoreactive terminals establish symmetric (Gray II) synapses on TH-reactive neurons. 相似文献
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Ildikó Vidra Kálmán Simon László Institóris Ingeborg Csöregh Mátyás Czugler 《Carbohydrate research》1982,111(1):41-57
After hydrolysis of 1,6-dibromo-1,6-dideoxygalactitol (1) and 1,2:5,6-dianhydrogalactitol (2), 11 compounds were isolated, three of them as tritylated derivatives. Their structures were established on the basis of chemical evidence and, for four compounds, by X-ray diffraction. The main product of the hydrolysis of 1 was 3,6-anhydro-1-bromo-1-deoxy-dl-galactitol; the end-products of the hydrolysis of 2 were 1,5-anhydro-dl-galactitol, 2,5-anhydro-dl-altritol, and galactitol. 相似文献
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6.
Polytene salivary gland nuclei of Chironomus pallidivittatus were transplanted into oocytes of Xenopus laevis which were then cultured in vitro for 18 h. The giant chromosomes and nucleoli as well as the entire nuclei enlarged considerably
in volume during this time. The polyteny and specific chromomere pattern of the chromosomes were maintained, and the puffing
of the salivary gland-specific Balbiani rings was not noticeably changed. — Polytene nuclei from differentiated insect cells
transplanted into Xenopus oocytes thus appear suited for exposing giant chromosomes in vivo to purified factors such as regulatory molecules.
This paper is dedicated to Professor Wolfgang Beermann on the occasion of his 60th birthday 相似文献
7.
Weanling female rats were stressed (by water and food deprivation for two days) and three months later the following indexes were studied: 5-HT and 5-HIAA levels in five brain regions, blood plasma and cerebrospinal fluid (CSF), sexual activity and nocistatin level of the plasma and CSF. The 5-HIAA content of hypothalamus and brainstem was significantly decreased (in the brainstem with one third) and in the striatum significantly increased. Plasma nocistatin level was significantly increased. Meyerson index and lordosis quotient were similar to control, but the estrus frequency almost doubled in the stressed animals. Much more defense reactions were observed in the stressed females during trials of mating. The results demonstrate that, 1) the perinatal period is not only sensitive to the remote-effects of stress but later could also be stress-sensitive critical periods, and 2) the continuously differentiating (e.g. bone marrow) cells are sensitive to late imprinting by stress, as well as to the brain and the sexual system. 相似文献
8.
Incorporation of the carbocyclic analogue of (E)-5-(2-bromovinyl)-2'-deoxyuridine 5'-triphosphate into a synthetic DNA 总被引:1,自引:0,他引:1
J Sági E De Clercq A Szemz? A Csárnyi T Kovács L Otv?s 《Biochemical and biophysical research communications》1987,147(3):1105-1112
The carbocyclic analogue of (E)-5-(2-bromovinyl)-2'-deoxyuridine, C-BVDU, is a very potent and selective anti-herpes-virus compound. In order to synthesize and study the properties of a DNA that contains C-BVDU, the 5'-triphosphate, C-BVDUTP was prepared and evaluated as a potential substrate of the E. coli Klenow DNA polymerase enzyme. Although C-BVDUTP proved to be a very poor substrate also of this enzyme, it could be incorporated up to 3.6% into the synthetic DNA, poly(dA-dT, C-BVDU). This level of substitution decreased significantly the template activity for DNA and RNA polymerases, as compared to that of poly(dA-dT). 相似文献
9.
The habituation of exploration of a goldfish, Carassius auratus, by paradise fish, Macropodus opercularis, was examined. A first encounter of at least 1 min was necessary for habituation to be found in a second encounter 3 h later. When the paradise fish were allowed 5 min to explore the goldfish and the second encounters were staged between 3 h and 3 months later, persistent habituation was found. The relation between memories formed during encounters with other species and modelling of the environment by the paradise fish is discussed. 相似文献
10.
I Gáti M Bergstr?m K Csóka C Muhr J Carlsson 《Prostaglandins, leukotrienes, and essential fatty acids》1990,40(2):117-124
The effects of two specific 5-lipoxygenase inhibitors AA-863 and U-60,257 (piriprost) on the growth of two human glioma cell lines, U-343 MGa and U-251 MG were investigated. Both monolayer cultured cells and spheroids were studied. The results of the monolayer studies showed potent and dose dependent inhibitory effects on the proliferation of glioma cells (IC50/one week treatment/of AA-863: 9.0 microM, IC50 of U-60,257: 40.0 microM). The experiments made on the tumor spheroids suggested an inhibitory effect on proliferation and volume growth already at lower doses (AA-863: 0.4-2.0 microM, U-60,257: 1.0-5.0 microM), a dose range where effects were not found in monolayers. At higher doses (AA-863: 10.0-30.0 microM, U-60,257: 30.0-90.0 microM) the experiments with spheroids failed to demonstrate a further inhibitory effect on spheroid volume, probably attributed to phenomena such as swelling of cells, dissociation of spheroid structure and development of necrosis. The clearly dose dependent inhibitory effect on the proliferation of human glioma cells in monolayer culture and the inhibitory effects on spheroid growth with these specific inhibitors indicate a role for lipoxygenase products in the growth of gliomas. 相似文献