Temat: osmoregulation - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Characterisation of Mesorhizobium huakuii cyclic β-glucan.
Autorzy:: Choma, Adam
Komaniecka, Iwona
Tematy:: OPG
NMR
cyclic β-glucan
Mesorhizobium huakuii
MALDI-TOF
osmoregulation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1043423.pdf Link otwiera się w nowym oknie
Opis:: Periplasmic and extracellular glucans of Mesorhizobium huakuii were isolated and characterized by compositional and MALDI-TOF analyses, as well as 1H and 13C NMR spectroscopy. It was shown that M. huakuii produces a cyclic β-glucan composed entirely of nonbranched glucose chains and unmodified by nonsugar substituents. The degree of polymerisation of the cyclic oligosaccharides was estimated to be in the range from 17 to 28. The most abundant glucan molecules contained 22 glucose residues. Glucose residues within the glucan were connected by β-(1,2) glycosidic linkages. The cyclic glucan produced by M. huakuii is quite similar to the periplasmic β-(1,2) glucans synthesized by Agrobacterium and Sinorhizobium genera. The synthesis of β-glucan in M. huakuii is osmoregulated and this glucan could function as an osmoprotectant in free living cells.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Anatomy and phylogeny of the gavialoid crocodylian Eosuchus lerichei from the Paleocene of Europe
Autorzy:: Delfino, M
Piras, P.
Smith, T.
Tematy:: phylogenesis
Crocodylia
Paleocene
Gavialidae
anatomy
osmoregulation
Europe
Eosuchus lerichei
paleontology; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/21197.pdf Link otwiera się w nowym oknie
Opis:: Originally designated by Dollo in 1907, the holotype of Eosuchus lerichei has never been carefully described but simply cited and compared in a number of papers. This work is an attempt to fill this gap and to place this taxon in a cladistic phylogenetic context. E. lerichei can be considered a valid basal gavialoid from late Paleocene of North Western Europe, sharing the presence of extremely enlarged foramina aerea on quadrates with the coeval Eosuchus minor from eastern North America (formerly described as Gavialis minor). These two species can be considered sister taxa and, for priority reason, they should be both ascribed to genus Eosuchus. The results of the cladistic analysis show that the European species possess characters that can be considered as slightly derived if compared to those of its American relative, suggesting an eastward dispersion from North America before the Paleocene–Eocene boundary and before the full opening of the Atlantic Ocean or local evolution from a basal gavialoid stock similar to E. minor. Both species of Eosuchus come from marine outcrops and represent a further evidence for the salt−water tolerance of the earliest stages of Gavialoidea evolutionary history. Despite the present endemicity of the only living gharial, Gavialis gangeticus, the historical biogeography of gavialoids shows a lost global distribution and reveals several transoceanic dispersals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modulation of sodium and ammonia transporters in the context of viral gill diseases in common carp (Cyprinus carpio)
Autorzy:: Zawisza, Maria
Marcinkowska, Magdalena
Rakus, Krzysztof
Abdullah, Muhammad
Adamek, Mikolaj
Matras, Marek
Opis:: Osmoregulation and ammonia removal are among key physiological processes that take place in gills and affect fish homeostasis and well-being. These processes can be disrupted by numerous environmental factors, but also by viral infections, especially those leading to severe gill disorders. The mechanisms of how viruses disrupt osmoregulation and ammonia removal in fish have not been extensively studied. We propose further exploration of the molecular and functional basis of viral induced gill disorders by studying the gene expression and enzyme activity of $Na^{+}/K^{+}$ -ATPases (NKA) and ammonia transporters in the gills and kidney of common carp during infection with two viruses: carp edema virus (CEV) and cyprinid herpesvirus 3 (CyHV-3). In the case of NKA, the expression of subunit α of selected NKA was affected by both viruses; however, no discernible trends were observed in the gills and kidneys. The enzyme activity of NKA was significantly reduced in the gills during infection with both CEV and CyHV-3. Moreover, our immunohistochemical studies showed that during infection with CEV and CyHV-3, NKA-rich cells are transferred from the primary lamellae to the more superficial space and to the secondary lamellae of the gills. In the case of ammonia transporters, both CEV and CyHV-3 infection resulted in downregulation of the expression of major transporters gdh1, Rhag, and Rhbg, allowing us to partly explain the ammonia accumulation in blood observed during infection with these viruses. This study highlighted that virus induced gill disorders may lead to disruption of osmoregulation and ammonia removal by dysregulating the expression and activity of NKA and ammonia transporters.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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