Search results for " defence"

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

2016

AbstractThe present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5–9 and for As(V) and Sb(V) – 3–6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3–9. The presence of c…

Mechanisms of refinement of avian nest defence behaviour

2003

Individual learning in the refinement of nest defence responses of the Yellow Warbler (Dendroica petechia)

2006

Hypervisor-Based White Listing of Executables

2019

We describe an efficient system for ensuring code integrity of an operating system (OS), both its own code and application code. The proposed system can protect from an attacker who has full control over the OS kernel. An evaluation of the system's performance suggests the induced overhead is negligible. peerReviewed

Personu, kurām ir tiesības uz aizstāvību, liecības kriminālprocesā

2020

Bakalaura darba tēma “Personu, kurām ir tiesības uz aizstāvību, liecības kriminālprocesā” sniedz vispārīgu ieskatu personu, kurām ir tiesības uz aizstāvību procesuālo statusu un šo personu sniegto liecību izpratnē. Darbā tiek apskatīta personu, kurām ir tiesības uz aizstāvību liecību iegūšanas veidi un šo personu kriminālprocesuālās tiesības attiecībā uz liecību sniegšanu kriminālprocesa gaitā. Darba ietvarā ir apskatīti un analizēti gaidāmie fundamentālie grozījumi attiecībā uz personām, kurām ir tiesības uz aizstāvību liecību saturu, nosakot, ka personām, kurām ir tiesības uz aizstāvību, būs jāsniedz patiesas liecības, ja tās izmantos savas tiesības liecināt.

Volatile compounds released by disturbed and undisturbed adults of Anchomenus dorsalis (Coleoptera, Carabidae, Platynini) and structure of the pygidi…

2011

Volatile compounds produced by adults of Anchomenus dorsalis under undisturbed and disturbed conditions were investigated with an all-glass aeration apparatus. GC-MS analysis of the crude extracts from undisturbed and disturbed adults highlighted four major volatile compounds, undecane, heneicosane, Z-9 tricosene and tricosane, of which significantly more undecane was released by disturbed adults compared to undisturbed beetles. The pygidial glands of adults of A. dorsalis were investigated using light and Transmission Electron Microscopy (TEM). Each gland showed dense aggregates of secretory cells organized into visually distinct lobes; a long collecting canal that drains the secretion tow…

Hard to catch: Experimental evidence supports evasive mimicry

2021

Most research on aposematism has focused on chemically defended prey, but the signalling difficulty of capture remains poorly explored. Similar to classical Batesian and Müllerian mimicry related to distastefulness, such ‘evasive aposematism' may also lead to convergence in warning colours, known as evasive mimicry. A prime candidate group for evasive mimicry areAdelphabutterflies, which are agile insects and show remarkable colour pattern convergence. We tested the ability of naive blue tits to learn to avoid and generalizeAdelphawing patterns associated with the difficulty of capture and compared their response to that of birds that learned to associate the same wing patterns with distast…

Proces modernizacji polskiej armii w perspektywie planu modernizacji technicznej sił zbrojnych na lata 2017-2022. Szanse i zagrożenia dla bezpieczeńs…

2017

Proces modernizacji polskiej armii jest jednym z najdłużej trwających procesów polityczno-militarno-społecznych w Polsce. Czas trwania, wielokrotne zmiany koncepcji planów modernizacyjnych Wojska Polskiego, przetasowania na polskiej scenie politycznej – wszystkie te czynniki miały niebagatelny wpływ na czas, jakość i koszty samego procesu modernizacji, który z tychże powodów trwa do dnia dzisiejszego. Celem artykułu jest przybliżenie czytelnikowi najważniejszych szans i zagrożeń wynikających z zmodernizowanego Panu Modernizacji Technicznej Wojska Polskiego.

Switching spatial scale reveals dominance-dependent social foraging tactics in a wild primate

2017

When foraging in a social group, individuals are faced with the choice of sampling their environment directly or exploiting the discoveries of others. The evolutionary dynamics of this trade-off have been explored mathematically through the producer-scrounger game, which has highlighted socially exploitative behaviours as a major potential cost of group living. However, our understanding of the tight interplay that can exist between social dominance and scrounging behaviour is limited. To date, only two theoretical studies have explored this relationship systematically, demonstrating that because scrounging requires joining a competitor at a resource, it should become exclusive to high-rank…

The evolution and ecology of multiple antipredator defences

2023

Prey seldom rely on a single type of antipredator defence, often using multiple defences to avoid predation. In many cases, selection in different contexts may favour the evolution of multiple defences in a prey. However, a prey may use multiple defences to protect itself during a single predator encounter. Such “defence portfolios” that defend prey against a single instance of predation are distributed across and within successive stages of the predation sequence (encounter, detection, identification, approach (attack), subjugation and consumption). We contend that at present, our understanding of defence portfolio evolution is incomplete, and seen from the fragmentary perspective of speci…