Search results for "type"

Body coloration and mechanisms of colour production in Archelosauria: the case of deirocheline turtles

2019

Animal body coloration is a complex trait resulting from the interplay of multiple mechanisms. While many studies address the functions of animal coloration, the mechanisms of colour production still remain unknown in most taxa. Here we compare reflectance spectra, cellular, ultra- and nano-structure of colour-producing elements, and pigment types in two freshwater turtles with contrasting courtship behaviour,Trachemys scriptaandPseudemys concinna. The two species differ in the distribution of pigment cell-types and in pigment diversity. We found xanthophores, melanocytes, abundant iridophores and dermal collagen fibres in stripes of both species. The yellow chin and forelimb stripes of bot…

Molecular characterization of Treponema pallidum subsp. pallidum in Switzerland and France with a new multilocus sequence typing scheme

2018

Syphilis is an important public health problem and an increasing incidence has been noted in recent years. Characterization of strain diversity through molecular data plays a critical role in the epidemiological understanding of this re-emergence. We here propose a new high-resolution multilocus sequence typing (MLST) scheme for Treponema pallidum subsp. pallidum (TPA). We analyzed 30 complete and draft TPA genomes obtained directly from clinical samples or from rabbit propagated strains to identify suitable typing loci and tested the new scheme on 120 clinical samples collected in Switzerland and France. Our analyses yielded three loci with high discriminatory power: TP0136, TP0548, and TP…

Host’s genetic background determines the outcome of reciprocal faecal transplantation on life-history traits and microbiome composition

2022

Abstract Background Microbes play a role in their host's fundamental ecological, chemical, and physiological processes. Host life-history traits from defence to growth are therefore determined not only by the abiotic environment and genotype but also by microbiota composition. However, the relative importance and interactive effects of these factors may vary between organisms. Such connections remain particularly elusive in Lepidoptera, which have been argued to lack a permanent microbiome and have microbiota primarily determined by their diet and environment. We tested the microbiome specificity and its influence on life-history traits of two colour genotypes of the wood tiger moth (Arctia…

Sievietes tēls semantiskajā pieejā: Trojas Romāns, Fīvu Romāns un Enejas Romāns

2016

Esošs pētījums studē sievietes tēlu trīs antīkajos romānos: Trojas Romānā, Fīvu Romānā un Enejas Romānā. Tie ir uzrakstīti 12.gadsimtā un skaitās ka stārpnieciskais etaps starp episku dziesmu un kurtuāzu romānu, kur sieviešķu varoņu klātbūtne spēlē svarīgu lomu. Esoša pētījuma mērķis ir sieviešu varoņu semantiska studēšana lai rekonstruētu sievietes prototipisku tēlu literatūrā. Mēs pielietojam izotopijas pieeju lai identificētu korpusa vienības, kas atbilst mūsu pētījuma problemātikai. Pēc tām mēs pakļaujam tās vienības smantiskajai analīzei un pielietojam prototīpa teoriju. Analīzes gaitā mēs noformulējam hipotēzi ka sievietes tēls viduslaiku vēlāku romanu tradicjā ir mantojis semas, izšķ…

Polarization types of isogenous Prym-Tyurin varieties

2007

Let p:C-->Y be a covering of smooth, projective curves which is a composition of ��:C-->C' of degree 2 and g:C'-->Y of degree n. Let f:X-->Y be the covering of degree 2^n, where the curve X parametrizes the liftings in C^{(n)} of the fibers of g:C'-->Y. Let P(X,��) be the associated Prym-Tyurin variety, known to be isogenous to the Prym variety P(C,C'). Most of the results in the paper focus on calculating the polarization type of the restriction of the canonical polarization of JX on P(X,��). We obtain the polarization type when n=3. When Y=P^1 we conjecture that P(X,��) is isomorphic to the dual of the Prym variety P(C,C'). This was known when n=2, we prove it when n=3, and…

Paternal uniparental disomy chromosome 14-like syndrome due a maternal de novo 160 kb deletion at the 14q32.2 region not encompassing the IG- and the…

2015

The human chromosome 14q32 carries a cluster of imprinted genes which include the paternally expressed genes (PEGs) DLK1 and RTL1, as well as the maternally expressed genes (MEGs) MEG3, RTL1as, and MEG8. PEGs and MEGs expression at the 14q32.2-imprinted region are regulated by two differentially methylated regions (DMRs): the IG-DMR and the MEG3-DMR, which are respectively methylated on the paternal and unmethylated on the maternal chromosome 14 in most cells. Genetic and epigenetic abnormalities affecting these imprinted gene clusters result in two different phenotypes currently known as maternal upd(14) syndrome and paternal upd(14) syndrome. However, only few patients carrying a maternal…

Fine-scale spatial genetic structure analysis of the black truffle T uber aestivum and its link to aroma variability

2015

Truffles are symbiotic fungi in high demand by food connoisseurs. Improving yield and product quality requires a better understanding of truffle genetics and aroma biosynthesis. One aim here was to investigate the diversity and fine-scale spatial genetic structure of the Burgundy truffle Tuber aestivum. The second aim was to assess how genetic structuring along with fruiting body maturation and geographical origin influenced single constituents of truffle aroma. A total of 39 Burgundy truffles collected in two orchards were characterized in terms of aroma profile (SPME-GC/MS) and genotype (microsatellites). A moderate genetic differentiation was observed between the populations of the two o…

2015

Primary roots (radicles) represent the first visible developmental stages of the plant and are crucial for nutrient supply and the integration of environmental signals. Few studies have analyzed primary roots at a molecular level, and were mostly limited to Arabidopsis. Here we study the primary root transcriptomes of standard type, heterozygous columnar and homozygous columnar apple (Malus x domestica) by RNA-Seq and quantitative real-time PCR. The columnar growth habit is characterized by a stunted main axis and the development of short fruit spurs instead of long lateral branches. This compact growth possesses economic potential because it allows high density planting and mechanical harv…

16S rDNA analysis for characterization of denitrifying bacteria isolated from three agricultural soils

2000

Bacteria capable of denitrification are spread among phylogenetically diverse groups. In the present investigation, molecular methods (amplified ribosomal DNA restriction analysis (ARDRA) and partial 16S rDNA gene sequencing) were used to determine the genetic diversity of culturable denitrifying soil bacteria. The purpose of this work was to study the microbial density and diversity of denitrifying communities isolated from two luvisols and a rendosol. The denitrifying bacterial density was significantly higher in the two luvisols (3x10(6) and 4x10(6) bacteria g(-1) dry soil) than in the rendosol (4x10(5) bacteria g(-1) dry soil). Denitrifying isolates from soils were grouped according to …

Papel de las leguminosas en la alimentación actual

2010

5 páginas, 2 figuras, 2 tablas.-- et al.