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31.
Rosana Ribić Lidija Habjanec Ruža Frkanec Branka Vranešić Srđanka Tomić 《化学与生物多样性》2012,9(7):1373-1381
The mannosylated derivative of adamant‐1‐yl tripeptide (D ‐(Ad‐1‐yl)Gly‐L ‐Ala‐D ‐isoGln) was prepared to study the effects of mannosylation on adjuvant (immunostimulating) activity. Mannosylated adamant‐1‐yl tripeptide (Man‐OCH2CH(Me)CO‐D ‐(Ad‐1‐yl)Gly‐L ‐Ala‐D ‐isoGln) is a non‐pyrogenic, H2O‐soluble, and non‐toxic compound. Adjuvant activity of mannosylated adamantyl tripeptide was tested in the mouse model with ovalbumin as an antigen and in comparison to the parent tripeptide and peptidoglycan monomer (PGM, β‐D ‐GlcNAc‐(1→4)‐D ‐MurNAc‐L ‐Ala‐D ‐isoGln‐mesoDAP(εNH2)‐D ‐Ala‐D ‐Ala), a well‐known effective adjuvant. The mannosylation of adamantyl tripeptide caused the amplification of its immunostimulating activity in such a way that it was comparable to that of PGM. 相似文献
32.
Slobodanka Pajević Milan Borišev Srđan Rončević Dragana Vukov Ružica Igić 《Central European Journal of Biology》2008,3(3):285-294
In this paper, the ecological status of a section of the Danube River flowing through Serbia from Bezdan to Djerdap was evalutated.
Using the chemical composition of water, sediment samples from the littoral zone and dominant aquatic macrophytes, the level
of chemical pollution was ascertained. Chemical analyses of the water and sediment indicated that the tributaries flowing
into the Danube significantly influenced the chemical load of the water and as a direct consequence, the sediment. The concentration
of heavy metals including Cu, Mn and Cd found in plants of the Potamogeton genus, further indicated significant chemical pollution,
establishing a clear link between the chemical composition of plant tissues and the chemical composition of water and sediment.
This paper therefore describes how the chemical composition of aquatic plants can be used as a reliable indicator for heavy
metal pollution of aquatic ecosystems. 相似文献
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Brown, W. V., and Sr. C. Johnson. (U. Texas, Austin.) The fine structure of the grass guard cell. Amer. Jour, Bot. 49 (2): 110–115. Illus. 1962.—An electron microscopic study of 16 species of grasses classified in 10 tribes and 5 subfamilies has revealed some hitherto unknown facts about guard-cell structure. In species of 3 subfamilies, but not in the Festucoideae, there are membranes on the guard cells overarching the stoma. In the Festucoideae, the membrane is rudimentary or absent and is associated with a different cross-sectional shape of the guard cell. The central canal through the thick-walled region of the guard cell is structurally quite complex. The wall between the central canal and the subsidiary cell is thin and lacks plasmodesmata. There are plastids but no developed chloroplasts in grass guard cells. Mitochondria are abundant, but vacuoles are undetectable. At the ends of the guard-cell pair, the wall between them is incomplete and the protoplasts are confluent. 相似文献
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Ohne Zusammenfassung 相似文献
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Saša N. Malkov Miodrag V. Živković Miloš V. Beljanski Srđan Đ. Stojanović Snežana D. Zarić 《The protein journal》2009,28(2):74-86
Using the data from Protein Data Bank the correlations of primary and secondary structures of proteins were analyzed. The
correlation values of the amino acids and the eight secondary structure types were calculated, where the position of the amino
acid and the position in sequence with the particular secondary structure differ at most 25. The diagrams describing these
results indicate that correlations are significant at distances between −9 and 10. The results show that the substituents
on Cβ or Cγ atoms of amino acid play major role in their preference for particular secondary structure at the same position
in the sequence, while the polarity of amino acid has significant influence on α-helices and strands at some distance in the
sequence. The diagrams corresponding to polar amino acids are noticeably asymmetric. The diagrams point out the exchangeability
of residues in the proteins; the amino acids with similar diagrams have similar local folding requirements.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献