Search results for "PD"
showing 10 items of 1971 documents
Sibīrijas mēlziedes Ligularia sibirica (L.) Cass. demogrāfisko parametru ietekmējošie faktori Latvijā
2017
Sibīrijas mēlziede ir apdraudēta suga gan Latvijā, gan pasaulē. Latvijā Sibīrijas mēlziede sasniedz areāla Eiropas daļas rietumu, ziemeļrietumu robežu. Pirmo reizi Latvijas robežās šī suga konstatēta 1895. gadā. Kopumā ņemot Sibīrijas mēlziede ir purvu suga ar spēju augt un konkurēt dažādos augšanas apstākļos. Lai gan Sibīrijas mēlziede spēj konkurēt ar gari augošiem augiem un stiebrzālēm, tomēr dzīvotspēja šai populācijai ir maza, jo tieši jaunie īpatņi nespēj izturēt konkurenci un bez pietiekama apgaismojuma iet bojā. Tāpēc ir ļoti svarīgi, lai augi juvenīlajā stadijā izdzīvotu. Veicot Vilkoksona testu, noteikts vai pastāv būtiskas atšķirības Sibīrijas mēlziedes demogrāfiskajiem parametri…
Évaluation de la fluidité de la membrane plasmique avec la sonde fluorescente di-4-ANEPPDHQ: Adaptation de la technique de recouvrement de fluorescen…
2011
National audience; Au cours de l’interaction entre plantes et microorganismes, la membrane plasmique joue un rôle essentiel dans l’organisation précoce des mécanismes de réactions de défense mises en place par la plante. L’équipe Dynamique membranaire et réponse aux stress biotiques, de l’UMR Plante-Microbe-Environnement, s’intéresse aux modifications des propriétés du plasmalemme des cellules végétales dans ce type d’interactions. La fluidité membranaire est une de ces propriétés. La technique de retour de fluorescence après photoblanchiment (FRAP), réalisée à l’aide d’un microscope confocal à balayage laser, a été adaptée à l’étude des variations de la fluidité de la membrane plasmique de…
Common mechanisms underlying membrane modifications induced by protein interactions
2022
Inter- and Intraobserver Variation in the Assessment of Preoperative Colostograms in Male Anorectal Malformations: An ARM-Net Consortium Survey
2020
Aim:Male patients with anorectal malformations (ARM) are classified according to presence and level of the recto-urinary fistula. This is traditionally established by a preoperative high-pressure distal colostogram that may be variably interpreted by different surgeons. The aim of this study was to evaluate the inter- and intraobserver variation in the assessment by pediatric surgeons of preoperative colostograms with respect to the level of the recto-urinary fistula. Materials and Methods:Sixteen pediatric surgeons from 14 European centers belonging to the ARM-Net Consortium twice scored 130 images of distal colostograms taken in sagittal projection at a median age of 66 days of life (rang…
Dimension reduction for $-Delta_1$
2012
A 3D-2D dimension reduction for $-\Delta_1$ is obtained. A power law approximation from $-\Delta_p$ as $p \to 1$ in terms of $\Gamma$- convergence, duality and asymptotics for least gradient functions has also been provided.
Integration of large-area optical imagers for biometric recognition and touch in displays
2021
In recent years there has been an increasing interest to integrate optical sensing in mobile displays, for instance, for biometric fingerprint scanning functionality. There are several routes to incorporate optical fingerprint functionality within the full display area, each with their own benefits and challenges. Here we investigate the different integration routes using large-area, ultra-thin imagers based on organic photodiodes.
RAPD differentiation between Borderea pyrenaica and B. chouardii (Dioscoreaceae), two relict endangered taxa
2001
As currently circumscribed, the genus Borderea Mieg. comprises two narrowly distributed European taxa, Borderea pyrenaica (Bub.) Mieg. and B. chouardii (Gaussen) Heslot. An accumulation of facts such as that both species share a very close overall morphology, that only a single population of Borderea chouardii is known, and that they live in contrasting environments has led some authors to suggest that B. chouardii is a mere ecotype of the more widespread B. pyrenaica. We tested this hypothesis using RAPD markers in four populations of Borderea, three of them identified as B. pyrenaica and the other one representing the only known population of B. chouardii. Eleven out of twenty assayed pri…
Population genetic study in the Balearic endemic plant speciesDigitalis minor(Scrophulariaceae) using RAPD markers
2001
Digitalis minor (Scrophulariaceae) is a cardenolide-producing plant endemic to the eastern Balearic Islands (Mallorca, Menorca, and Cabrera) that occurs in two morphologically distinct varieties: D. minor var. minor (pubescent) and D. minor var. palaui (glabrous). Levels and patterns of genetic diversity in 162 individuals from 17 D. minor populations across the entire geographic range were assessed using random amplified polymorphic DNA (RAPD) markers. Comigrating RAPD fragments tested were found to be homologous by Southern hybridization in both var. minor and var. palaui. To avoid bias in parameter estimation, analyses of population genetic structure were restricted to those RAPD bands t…
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 …
Detection of ephemeral genetic sub-structure in the narrow endemic Abies nebrodensis (Lojac.) Mattei (Pinaceae) using RAPD markers
2004
A. nebrodensis (Nebrodi fir, Sicilian fir) is restricted to a small area of the Madonie Natural Park in Sicily. According to recent estimates, its only population consists of 30 adult individuals and a fluctuating number of juveniles derived from natural regeneration; besides, some hundreds of cultivated plants are preserved as ex situ collection. We used RAPD data from six 10-mer primers to examine the consequences of extensive historical clearance and human pressures on the extant population. Data from multiple life stages and different habitat conditions were considered, affording an opportunity to ascertain for the first time the structure of genetic variation in the extant uneven-aged …