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11.
V. M. Mashkova 《Human physiology》2000,26(4):388-392
The influence of a pharmaceutical preparation of glycine on the EEG and the quality of sensorimotor activity of healthy subjects
and alcoholics was studied during the performance of a test on pursuing tracking. Subjects with left-sided dominance of spatial
synchronization of cortical biopotentials in the posterofron-totemporal areas under conditions of quiet wakefulness with open
eyes were found to have an advantage in performing this kind of activity. Glycine normalized pathological changes of cortical
activity and, under certain conditions, improved sensorimotor parameters of operator activity. 相似文献
12.
13.
Adults of the human parasitic trematode Schistosoma mansoni, which causes
hepatosplenic/intestinal complications in humans, synthesize
glycoconjugates containing the Lewis x (Lex) Galbeta1-->4(Fucalpha1--
>3)GlcNAcbeta1-->R, but not sialyl Lewis x (sLex), antigen. We now
report on our analyses of Lexand sLexexpression in S.haematobium and
S.japonicum, which are two other major species of human schistosomes that
cause disease, and the possible autoimmunity to these antigens in infected
individuals. Antigen expression was evaluated by both ELISA and Western
blot analyses of detergent extracts of parasites using monoclonal
antibodies. Several high molecular weight glycoproteins in both S.
haematobium and S. japonicum contain the Lexantigen, but no sialyl
Lexantigen was detected. In addition, sera from humans and rodents infected
with S.haematobium and S.japonicum contain antibodies reactive with Lex.
These results led us to investigate whether Lexantigens are expressed in
other helminths, including the parasitic trematode Fasciola hepatica , the
parasitic nematode Dirofilaria immitis (dog heartworm), the ruminant
nematode Haemonchus contortus , and the free-living nematode Caenorhabditis
elegans . Neither Lexnor sialyl-Lexis detectable in these other helminths.
Furthermore, none of the helminths, including schistosomes, express Lea,
Leb, Ley, or the H- type 1 antigen. However, several glycoproteins from all
helminths analyzed are bound by Lotus tetragonolobus agglutinin , which
binds Fucalpha1-->3GlcNAc, and Wisteria floribunda agglutinin, which
binds GalNAcbeta1-->4GlcNAc (lacdiNAc or LDN). Thus, schistosomes may be
unique among helminths in expressing the Lexantigen, whereas many different
helminths may express alpha1,3-fucosylated glycans and the LDN motif.
相似文献
14.
15.
Simultaneous exhaustive modification of cytidine and uridine residues of rRNA with methoxyamine and sodium metabisulfite renders adjacent phosphodiester bonds resistant to pancreatic and T2 ribonucleases. Another method of T2 RNAase restriction is modification of cytidine with methoxyaminebisulfite followed by modification of guanosine residues with beta-ethoxy-alpha-ketobutyraldehyde. Mild alkaline treatment leads to demodification of uridine and guanosine residues leaving intact modified cytidine residues, thus providing a means of stepwise, directed cleavage of the polynucleotide. The series of combined cleavage procedures and methods of isolation of oligo(C), oligo(G) and oligopyrimidine tracts, as well as the procedure of selective cleavage at uridine residues elaborated in the course of the present studies may serve as a basis for more rational procedures of RNA sequencing. 相似文献
16.
The applications of the fluorescent staining of chromosomes with quinacrine mustard allowed to identify a dicentric Y-chromosome in two patients with defected external gynaetalies: a boy of 15 years old and a girl of 2 years old. Both the patients had mosaicism of sex chromosomes: 45, x/46, x dic (Y). The dicentric Y-chromosome, resembling chromosome, 16, had bright luminescence of the thelomeric regions characteristic of the normal Y-chromosome. Besides, a balanced autosomic translocation t (1, 14) (q 31, q 3) was found in the girl identified also with quinacrine mustard fluorescent staining. 相似文献
17.
M Barciszewska G Keith G Dirheimer T Mashkova E Kubli J Barciszewski 《Biochimica et biophysica acta》1990,1048(1):78-84
Six tRNA(Leu) isoacceptors from yellow lupin seeds were purified, sequenced, and their readthrough properties over the UAG stop codon were tested using TMV RNA as a messenger. The tested tRNAs(Leu) did not show amber suppressor activity. The partial structure of tRNA(Gln), a minor species in yellow lupin, was also determined. Comparison of the nucleotide sequence of all known isoacceptors of tRNA(Tyr), tRNA(Gln) and tRNA(Leu) from plants, mammals and ciliates enabled us to find general structural requirements for tRNA to be a UAG suppressor. From the partial sequence of lupin tRNA(Gln) we suggest that it will have readthrough properties. 相似文献
18.
Effect of insulin (0.4 units/l) and taurine (0.4 g/l) on potassium transport to a perfusate was studied using perfusing rat liver isolated on the 1st and 3d days following irradiation (18.06.10(-2) C/kg). Both preparations were shown to diminish reliably the release of potassium ions from cellular structures of irradiated rat liver. 相似文献
19.
The marine bacterium, Halomonas marina (ATCC 27129), was shown to inhibit settlement and development of the sessile invertebrates Balanus amphitrite and Bugula neritina. Different bacterial treatments were employed to investigate this interaction. Filmed bacteria and liquid suspensions of whole cells, lysed cells and culture filtrate all reduced settlement of B. amphitrite. Polyurethane coatings containing whole cells were partially inhibitory while lysed cells caused complete inhibition of B. amphitrite larval settlement. In contrast, culture filtrate in a polyurethane matrix stimulated settlement of B. amphitrite larvae. Whole cells, culture filtrate, and lysed cells embedded in a polyurethane coating also controlled B. neritina settlement and maturation. 相似文献
20.
Dexamethasone regulates the program of secretory glycoprotein synthesis in hepatoma tissue culture cells 总被引:4,自引:3,他引:1 下载免费PDF全文
The secretory glycoproteins synthesized by hepatoma tissue culture (HTC) cells were resolved by two-dimensional polyacrylamide gel electrophoresis of media from cells that were grown in the presence of [(3)H]fucose. These cells synthesize and secrete a complex set of fucose-containing glycoproteins. These secretory glycoproteins are distinct from those glycoproteins present in the plasma membrane of HTC cells. Incubation of HTC cells with dexamethasone has a pronounced effect on the quality and quantity (denoted here as the program) of secretory protein synthesis, as assayed by the short-term incorporation of labeled mannose, fucose, or methionine. The synthesis of two mannose- and fucose- containing glycoprotein series, one of 50,000 mol wt and a more heterogeneous series with mol wt of 35,000-50,000, is increased to a high level by the hormone; conversely, the synthesis of other secretory proteins, particularly one with mol wt of 70,000, is decreased or stopped completely. The synthesis of some major secretory proteins is not affected by the hormone. Dexamethasone has less of an effect on the composition of either total cell membrane glycoprotein or plasma membrane glycoprotein. But there is a decrease in the synthesis of a major membrane glycoprotein series with mol wt of 140,000. These effects of dexamethasone are relatively specific to HTC cells. Neither Reuber H-35 cells nor primary cultures of rat hepatocytes show the same response to the steroid. Two variant HTC cell lines, which were selected for their resistance to dexamethasone inhibition of extracellular plasminogen activator activity, respond only partially to the steroid-induced regulation of the secretory and membrane glycoproteins. 相似文献