Search results for "Stre"

Genetic manipulation of spiramycin-producing strain Streptomyces ambofaciens ATCC 23877 by φC31 Att/Int system-based vectors results in a significant…

The genus Streptomyces produces about two-thirds of naturally occurring antibiotics and many other biologically active secondary metabolites. The genetic manipulation of Streptomycetes is often labor and time intensive due to their large genome and complex development. Much progress has been made to develop gene transfer methods useful to construct antibiotic-producing strains with improved properties. The φC31 Att/Int system is an integration system that has been widely used to produce stable recombinants in Actinomycetes and its integration site is an attB site located in a pirin-like gene (pirA) of the bacterial chromosome. In this study we demonstrate that the integration of φC31 DNA in…

Deformabilita' eritrocitaria, metaboliti stabili dell'NO e perossidazione lipidica in atleti non professionisti

2009

Spriedzes mazināšanas iespējas sporta stundās pusaudžiem

2015

Diplomdarba „Spriedzes mazināšanas iespējas sporta stundā pusaudžiem” mērķis ir noskaidrot kā un ar kādiem paņēmieniem sporta stundās ir iespējams samazināt spriedzi pusaudžiem. Autore darba teorētiskajā daļā apskata spriedzes jēdziena un tā cēloņu aspektus, kā arī profilakses iespējas. Lai vērtīgāk spētu izvēlēties metodes un paņēmienus, kas saistīti ar spriedzes mazināšanas iespējām sporta stundā, autore apskata arī konkrētā vecumposma fiziskās, emocionālās un sociālās īpašības un tām raksturīgākās pazīmes, kas var ietekmēt arī mācību procesu. Empīriskajā daļā autore veic aptaujas metodi, kas palīdz izzināt skolēnu zināšanas un iespējamās kritiskās situācijas sporta stundas laikā, kur pus…

Ski jumping takeoff in a wind tunnel with skis.

2011

The effect of skis on the force–time characteristics of the simulated ski jumping takeoff was examined in a wind tunnel. Takeoff forces were recorded with a force plate installed under the tunnel floor. Signals from the front and rear parts of the force plate were collected separately to examine the anteroposterior balance of the jumpers during the takeoff. Two ski jumpers performed simulated takeoffs, first without skis in nonwind conditions and in various wind conditions. Thereafter, the same experiments were repeated with skis. The jumpers were able to perform very natural takeoff actions (similar to the actual takeoff) with skis in wind tunnel. According to the subjective feeling of the…

Fish introductions and light modulate food web fluxes in tropical streams : a whole-ecosystem experimental approach

2016

Decades of ecological study have demonstrated the importance of top-down and bottom-up controls on food webs, yet few studies within this context have quantified the magnitude of energy and material fluxes at the whole-ecosystem scale. We examined top-down and bottom-up effects on food web fluxes using a field experiment that manipulated the presence of a consumer, the Trinidadian guppy Poecilia reticulata, and the production of basal resources by thinning the riparian forest canopy to increase incident light. To gauge the effects of these reach-scale manipulations on food web fluxes, we used a nitrogen (15N) stable isotope tracer to compare basal resource treatments (thinned canopy vs. con…

Leveraging Users' Likes in a Video Streaming P2P Platform

2014

This paper investigates how a p2p television platform can take advantage of the presence of frequent channel viewers to grant them a more satisfying service than to less regular spectators. The idea we explore is to learn beforehand about the users' interests, in order to cluster them in groups that display different behaviors; then, the neighborhood creation strategy and video chunk scheduling algorithm of the overlay is altered, with the aim of serving frequent spectators in a privileged manner, providing them with a faster access to the selected channel without overly penalizing less habitual customers. An analytical model is developed, to capture the difference in startup delay that the…

A photometric study of Be stars located in the seismology fields of COROT

2007

Context: In preparation for the COROT mission, an exhaustive photometric study of Be stars located in the seismology fields of the COROT mission has been performed. The very precise and long-time-spanned photometric observations gathered by the COROT satellite will give important clues of the origin of the Be phenomenon. Aims: The aim of this work is to find short-period variable Be stars located in the seismology fields of COROT and to study and characterise their pulsational properties. Methods: Light curves obtained at the Observatorio de Sierra Nevada together with data from Hipparcos and ASAS-3 of a total of 84 Be stars have been analysed in order to search for short-term variations. W…

Lo stress ossidativo nella steatoepatite alcolica e non alcolica e nella pancreatite acuta e cronica

2010

Flexural Behavior of Steel Fibrous Reinforced Concrete Deep Beams

2012

Experimental research was carried out regarding the flexural behavior of deep beams cast with plain and fibrous concrete with hooked steel fibers, and subjected to monotonic vertical loads. Four deep fiber-reinforced concrete beams were cast. Two of them were made of plain concrete with main and web steel reinforcements (RC), and two were made of hooked steel fiber-reinforced concrete (SFRC) with main steel reinforcements. The experimental results show the brittle behavior of reinforced deep RC members characterized by crushing of concrete struts and fracture of web steel bars. SFRC deep beams exhibit higher strength and, above all, ductility with respect to RC members due to the bridging a…

Distress, Eustress, or No Stress? Explaining Smartphone Users' Different Technostress Responses

2018

Technostress is common and has harmful consequences. Therefore, researchers have shown increasing interest in explaining technostress in the field of information systems (IS). While extant research merits in identifying the causes and consequences of technostress, it has not explained empirically why information technology (IT) users have different responses to similar potentially stressful IT events. Indeed, events such as smartphone failures can derive negative distress responses for some users and positive eustress responses for others. To address this gap in research, we conducted a qualitative study by interviewing users who had experienced smartphone failures. As a contribution, our f…