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showing 10 items of 2851 documents
(no title)
2017
Biological invasions are recognized as a significant evolutionary factor over short time scales. In particular, their effect is well recorded on the genetic structure of populations, the patterns of phenotypic evolution and the richness of parasite fauna associated to invasive populations. This study aims at quantifying the consequences of a biological invasion according to these three levels (genetical, phenotypical and parasitological) taking as example the Mozambique tilapia Oreochromis mossambicus. This African cichlid is characterized by an unusual conservation status since it is both (i) ranked among the world's worst invasive species due to its global dispersion during the 20th centu…
Study of morphology, mechanical properties and thermal degradation of titania-polycarbonate nanocomposites as function of crystalline phase and amount
2013
Titania nanoparticles were prepared using a sol–gel method and calcination at 2008C and 6008C to obtain anatase and rutile phases, respectively. The obtained powders were used to prepare polycarbonate (PC)-titania nanocomposites by melt compounding. The effect of different crystalline phases and amounts of titania, in the range 1–5 wt%, on the morphology, mechanical properties, and thermal degradation kinetics of PC was investigated. The results show that the filler modified the plasticity or rigidity of the polymer and influenced the degradation kinetics, in different ways depending on the type and amount of titania.
The role of digital information sources in the travel planning process
2021
World Economic Forum’s Digital Transformation Initiative emphasizes that digitalisation in tourism is transforming the industry at an exponential rate across the globe. Current tourist behaviour patterns are changing not so much in travel habits as in the ways of finding and using travel information. These digitalisation changes are evident at all travel stages starting from dreaming about the future trip, planning and booking necessary tourism services, as well as sharing information and evaluating experiences. Tourist destination organisations and companies need to make strategic decisions, when sharing information, to reach the target audience in a smart and efficient way. The purpose of…
User Preference and Channels Use in the Employment Seeking Process
Trust is a major issue for social capital theory and the word- of mouth concept. This paper compares social network sites with other media under consideration of trust and support. The research evaluates the difference between sources regarding trust and support to explain the situation of social network sites under consideration of the employment seeking process. The aim of this paper is the evaluation of the use of social network sites and private social networks by comparing these with job boards, company information, newspaper and official employment agency web pages. It is to identify the possible differences between information channels and the reasons for the use of different sources…
Behavioural adaptations of argulid parasites (Crustacea: Branchiura) to major challenges in their life cycle
2015
Fish lice (Argulus spp.) are obligate ectoparasites, which contrary to most aquatic parasites, retain the ability to swim freely throughout the whole of their life. In fish farms, they can quickly increase in numbers and without effective control cause argulosis, which results in the reduced growth and survival of their fish hosts. The morphology of Argulus spp, including their sensory organs, is suitable for both parasitism and free-swimming. By spending a considerable amount of time away from their host, these parasites risk being excessively dispersed, which could endanger mating success. Here we present a review of recent studies on the behaviour of Argulus spp, especially the aggregati…
CYGD: the Comprehensive Yeast Genome Database.
2005
The comprehensive resource is available under http://mips.gsf.de/genre/proj/yeast/.; International audience; The Comprehensive Yeast Genome Database (CYGD) compiles a comprehensive data resource for information on the cellular functions of the yeast Saccharomyces cerevisiae and related species, chosen as the best understood model organism for eukaryotes. The database serves as a common resource generated by a European consortium, going beyond the provision of sequence information and functional annotations on individual genes and proteins. In addition, it provides information on the physical and functional interactions among proteins as well as other genetic elements. These cellular network…
In vitro studies on the activation of the hepatitis C virus NS3 proteinase by the NS4A cofactor.
1996
AbstractProteolytic processing of the nonstructural proteins of the hepatitis C virus (HCV) is mediated by two viral proteinases: the NS2-3 proteinase cleaving at the NS2/3 junction and the NS3 serine-type proteinase responsible for processing at the NS3/4A, NS4A/B, NS4B/5A, and NS5A/B sites. Activity of the NS3 proteinase is modulated by NS4A. In the absence of this cofactor processing at the NS3-dependent sites does not occur or, in the case of the NS5A/B junction, is poor but increased when NS4A is present. Although recent studies demonstrated that proteinase activation requires direct interaction between NS3 and NS4A, the mechanism by which NS4A exerts the activation function is not kno…
Tumor targeting of baculovirus displaying a lymphatic homing peptide.
2008
Background Tumor-associated cells and vasculature express attractive molecular markers for site-specific vector targeting. To attain tumor-selective tropism, we recently developed a baculovirus vector displaying the lymphatic homing peptide LyP-1, originally identified by ex vivo/in vivo screening of phage display libraries, on the viral envelope by fusion to the transmembrane anchor of vesicular stomatitis virus G-protein. Methods In the present study, we explored the specificity and kinetics of viral binding and internalization as well as in vivo tumor homing of the LyP-1 displaying virus to elucidate the applicability of baculovirus for targeted therapies. Results We demonstrated that th…
Development and characterisation of polymer composite materials with bio-inspired functions
2018
Promocijas darbs ir izstrādāts disertācijas veidā fizikas nozarē materiālu fizikas apakšnozarē. Pētījums tika veikts LU Materiālu mehānikas institūtā. Darbs saistīts ar aktuālu un jaunu pētījumu virzienu: bioinspirēto funkciju tālāku attīstīšanu slodzi nesošos kompozītos. Tās ir mehānisku triecienu vizuālās indikācijas un polimēru matricas vaskulārās pašdziedināšanas funkcijas. Šīs funkcijas tika nodrošinātas, izveidojot viedus slāņus un iebūvējot tos kompozītā. Pētījumā tika noskaidrotas piemērotās pārbaužu secības, attīstītas kvantitatīvas metodes un mehānisks modelis, lai novērtētu jauno funkciju efektivitāti kompozītos. Ir pierādīta funkciju augstā efektivitāte un spēja uzlabot slodzi n…
Travelling to the green island full of shamrocks and pubs – or not : representations of Ireland in tourism web sites
2009
Matkailu on merkittävä tekijä elinkeinoelämässä, myös Irlannissa: kaikkiaan 5 % irlantilaisista työskenteli vuonna 2007 matkailualalla. Internet on yhä enenevässä määrin matkailun edistämiseen käytetty väylä. Matkailun kieli on oma diskurssinsa, jossa luodaan tietty kuva kohdemaasta ja sen kulttuurista. Matkailua edistävissä esitteissä, oppaissa ja WWW-sivuilla korostetaan tiettyjä asioita kun taas toiset asiat jätetään mainitsematta. Yleinen mainontastrategia on esittää kohdemaa mahdollisimman eksoottisena ja erilaisena kuin potentiaalisen asiakkaan oma kotimaa, jolloin korostetaan kohdemaan erikoisempia piirteitä. Kohteeseen liittyvien stereotypioiden hyödyntäminen on myös yleistä matkai…