Search results for "RACE"
showing 10 items of 4458 documents
Hieracium barrelieri, a new hawkweed species from S Italy, with notes on Tenore’s Hieracium murorum var. barrelieri (Asteraceae)
2015
A new species from Montevergine in Campania, Hieracium barrelieri, is described in detail. It is closest to H. acanthodontoides of H. sect. Acanthodontoidea. H. murorum var. barrelieri, an obsolete taxon described by Tenore, is also discussed, as it was partly based on the same population.
Native and subunit molecular mass and quarternary structure of the hemoglobin from the primitive branchiopod crustacean Triops cancriformis
2006
Many branchiopod crustaceans are endowed with extracellular, high-molecular-weight hemoglobins whose exact structural characteristics have remained a matter of conjecture. By using a broad spectrum of techniques, we provide precise and coherent information on the hemoglobin of one of the phylogenetically ‘oldest’ extant branchiopods, the tadpole shrimp Triops cancriformis. The hemoglobin dissociated under reducing conditions into two subunits, designated TcHbA and TcHbB, with masses of 35 775 ± 4 and 36 055 ± 4 Da, respectively, determined by ESI-MS. Nonreducing conditions showed only two disulfide-bridged dimers, a homodimer of TcHbA, designated D1 (71 548 ± 5 Da), and the heterodimer D2 (…
RAPD evidence for a sister group relationship of the presumed progenitor-derivative species pairSenecio nebrodensis andS. viscosus (Asteraceae)
1998
The phylogenetic and phenetic analysis of 109 RAPD polymorphisms inS. nebrodensis, a perennial and self-incompatible endemic of four mountain ranges in Spain, andS. viscosus, a self-compatible annual widespread in Europe, as well asS. lividus, S. sylvaticus andS. vulgaris revealed a sister group relationship between the first two species. This result contrasts sharply with the earlier hypothesis based on isozyme variation thatS. viscosus originated from within a paraphyleticS. nebrodensis and that the two species represent a progenitor-derivative pair. After considering possible reasons for the sister group relationship found, including the possibility of rooting artefacts, it is concluded …
2015
Primary neuronal cultures share many typical features with the in vivo situation, including similarities in distinct electrical activity patterns and synaptic network interactions. Here, we use multi-electrode array (MEA) recordings from spontaneously active cultures of wildtype and GAD67-GFP transgenic mice to evaluate which spike parameters differ between GABAergic interneurons and principal, putatively glutamatergic neurons. To analyze this question we combine MEA recordings with optical imaging in sparse cortical cultures to assign individual spikes to visually-identified single neurons. In our culture system, excitatory and inhibitory neurons are present at a similar ratio as described…
Population structure and incidence of the stolbur phytoplasma vectorHyalesthes obsoletus(Cixiidae) among geographic regions in Switzerland
2013
The dissemination of stolbur phytoplasma (16Sr-XIIA group)-induced yellows diseases depends on the dispersal biology and host plant fidelity of the planthopper vector Hyalesthes obsoletus (Hemiptera: Cixiidae). We analysed the degree of these two properties in H. obsoletus by studying its population genetic structure and stolbur infection rates relative to the two major host plants, Convolvolus arvensis and Urtica dioica, in order to infer relevant divisions for stolbur epidemiology in Swiss viticultural regions. Three regional populations with the potential to determine stolbur epidemiology in distinct ways were identified. First, populations associated with U. dioica in northern Switzerla…
A newCentaureaspecies (Asteraceae) from Mt Sakar, South-eastern Bulgaria
2013
A new species of Centaurea, C. sakarensis, known from a single locality north-east of the village of Lessovo on Mt Sakar, is described and illustrated. It belongs to C. sect. Acrolophus, and its morphologically closest relative is C. cariensis Boiss., a Turkish endemic from western and south-western Anatolia. The new species is currently known from a single population of about 1000 individuals, growing on open stony calcareous places, at 475 m a.s.l., and should be classified as Critically Endangered, (B1ab[i, ii, iii]+2ab [i, ii, iii]).
THE FINE STRUCTURE OF O2 Hb BINDING IN ANIMALS: SALMO IRIDEUS
1980
Publisher Summary This chapter discusses the experimental results on study of the fine structure of O 2 Hb binding in animals. It is evident that the n ( S ) function represents a new tool to look at homotropic interactions, both qualitatively and quantitatively. At the moment, there are four applications: (1) study of molecular mechanism; (2) study of effectors, also pharmacological; (3) improved characterization of O 2 Hb binding, also in pathological cases; and (4) comparative studies in animals. Whole blood of fish is also investigated because usually there are found several hemoglobins. During registration of the O 2 binding curve, pH is not kept constant. Assuming that the Donnan fact…
A New Method to Reconstruct Quantitative Food Webs and Nutrient Flows from Isotope Tracer Addition Experiments
2020
Understanding how nutrients flow through food webs is central in ecosystem ecology. Tracer addition experiments are powerful tools to reconstruct nutrient flows by adding an isotopically enriched element into an ecosystem and tracking its fate through time. Historically, the design and analysis of tracer studies have varied widely, ranging from descriptive studies to modeling approaches of varying complexity. Increasingly, isotope tracer data are being used to compare ecosystems and analyze experimental manipulations. Currently, a formal statistical framework for analyzing such experiments is lacking, making it impossible to calculate the estimation errors associated with the model fit, the…
Ekstracelulārā matriksa sintēzes un degradācijas loma ādas dzīšanā un tās analīze biotehnoloģiski veidotos ādas audos
2015
Darba mērķis ir izstrādāt ādas audu modeli in vitro, balstītu uz ādas šūnu kokultūru kultivēšanu trīsdimensionālā fibrīna matriksā, kā arī noteikt izveidotajos audos ekstracelulārā matriksa (ECM) komponentu sintēzi un degradāciju. Papildus tika ievākti arī hronisku brūču eksudātu paraugi, kuriem tika veikta dažādu – ar brūču dzīšanu saistītu marķieru analīze. Mērķa sasniegšanai tika izmantotas šūnu, molekulārās bioloģijas un imunoloģijas metodes. Darbā iegūtie rezultāti parāda ECM komponentu, to degradējošo enzīmu un augšanas faktoru produkcijas izmaiņas audu kultivēšanas laikā un ļauj izvēlēties optimālu ādas audu modeļsistēmas veidošanas un kultivēšanas metodiku. Darbs tika izstrādāts Pau…
In vitro modeļa izveide ļaundabīgā audzēja ekstracelulāro vezīkulu endocitozes pētīšanai mezenhimālajās šūnās
2016
Ekstracelulārās vezīkulas (EV) pārnes dažādas funkcionālas molekulas, nodrošinot informācijas pārnesi starp šūnām un ierosinot dažādus patoloģiskus procesus. Cilvēka mezenhimālās cilmes šūnas (MCŠ) ir vienas no audzēju stromas komponentēm, kas veicina audzēja augšanu un angioģenēzi. Darba mērķis bija noskaidrot, vai ādas MCŠ uzņem normoksijā un hipoksijā kultivētu kolorektālā audzēja šūnu līniju SW620 un SW480 EV, un izpētīt iespējamo endocitozes ceļu. Lai to noskaidrotu, tika izveidots in vitro modelis audzēja EV uzņemšanas pētījumiem MCŠ un noteiktas optimālās endocitozes inhibitoru koncentrācijas. Pētījuma rezultāti parāda, ka optimālā endocitozes inhibitoru citohalazīna-D un hlorpromazī…