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241.
Paulina Bolibok Marek Wiśniewski Katarzyna Roszek Artur P. Terzyk 《Die Naturwissenschaften》2017,104(3-4):36
In this study, graphene oxide (GO) has been applied as a matrix for enzyme immobilization. The protein adsorption capacity of GO is much higher than of other large surface area carbonaceous materials. Its structure and physicochemical properties are reported beneficial also for enzymatic activity modifications. The experimental proof was done here that GO-based biocatalytic systems with immobilized catalase are modifiable in terms of catalyzed reaction kinetic constants. It was found that activity and stability of catalase, considered here as model enzyme, closely depend on enzyme/GO ratio. The changes in kinetic parameters can be related to secondary structure alterations. The correlation between enzyme/GO ratio and kinetic and structure parameters is reported for the first time and enables the conscious control of biocatalytic processes and their extended applications. The biological activity of obtained biocatalytic systems was confirmed in vitro by the use of functional test. The addition of immobilized catalase improved the cells’ viability after they were exposed to hydrogen peroxide and tert-butyl-hydroperoxide used as source of reactive oxygen species. 相似文献
242.
Walter Q. Betancourt Sherif Abd-Elmaksoud Charles P. Gerba 《Food and environmental virology》2018,10(2):209-211
This study examined the efficacy of reovirus concentration from large volumes of water using two positively charged filters: Zeta Plus 1MDS and NanoCeram. The results indicated that an average of 61 and 81% of input reoviruses were effectively recovered, respectively, from recycled water and tap water using NanoCeram filtration. 相似文献
243.
244.
Vincent Careau Jean-François Giroux Dominique Berteaux 《Behavioral ecology and sociobiology》2007,62(1):87-96
Food-hoarding animals are expected to preferentially cache items with lower perishability and/or higher consumption time.
We observed arctic foxes (Alopex lagopus) foraging in a greater snow goose (Anser caerulescens atlanticus) colony where the main prey of foxes consisted of goose eggs, goslings, and lemmings (Lemmus and Dicrostonyx spp.). We recorded the number of prey consumed and cached and the time that foxes invested in these activities. Foxes took
more time to consume a goose egg than a lemming or gosling but cached a greater proportion of eggs than the other prey type.
This may be caused by the eggshell, which presumably decreases the perishability and/or pilfering risk of cached eggs, but
also increases egg consumption time. Arctic foxes usually recached goose eggs but rarely recached goslings or lemmings. We
tested whether the rapid-sequestering hypothesis could explain this recaching behavior. According to this hypothesis, arctic
foxes may adopt a two-stage strategy allowing both to maximize egg acquisition rate in an undefended nest and subsequently
secure eggs in potentially safer sites. Foxes spent more time carrying an egg and traveled greater distances when establishing
a secondary than a primary cache. To gain further information on the location and subsequent fate of cached eggs, we used
dummy eggs containing radio transmitters. Lifespan of primary caches increased with distance from the goose nest. Secondary
caches were generally located farther from the nest and had a longer lifespan than primary caches. Behavioral observations
and the radio-tagged egg technique both gave results supporting the rapid-sequestering hypothesis. 相似文献
245.
Remotely operated vehicle dive video recordings of deep-sea squid ink release were examined to determine species, ink release
type, release depth, and accompanying behavior/s. Ink release was commonly observed between the surface and 1,842.1 m in Monterey
Bay, CA, and surrounding waters. Six ink release types were observed: pseudomorphs, pseudomorph series, ink ropes, clouds/smokescreens,
diffuse puffs and mantle fills. Each species released ink throughout all or most of its depth range; inking was not limited
to shallow, sunlit waters. Individuals of each species produced one ink release type more commonly than other types, however,
multiple ink types could be released by individuals of all species. Common behaviors preceded and/or followed each release
type; pseudomorphs and pseudomorph series were generally associated with escape behaviors, while ink ropes, clouds, and puffs
normally involved the animal remaining adjacent to or amid the ink. Deep-sea squids may use ink for defensive purposes similar
to those of shallow-dwelling species when they release pseudomorphs, pseudomorph series, or large clouds, and may use ink
puffs in intra-specific communication. The function of ink ropes and mantle fills is unknown. 相似文献
246.
Mohamed F. Yassin 《Environmental monitoring and assessment》2012,184(6):3749-3760
This paper presents a model for coupling the statistics of wind velocity distribution and atmospheric pollutant dispersion.
The effect of wind velocity distribution is modeled as a three-dimensional finite-impulse response (3D-FIR) filter. A phase
space representation of the 3D-FIR filter window is discussed. The resulting pollutant dispersion is the multiplication in
the phase space of the 3-D Fourier transform of the pollutant concentration and the volume described by the filter window
coefficients. The shape of the filter window in the phase space enables representing such effects as vortex shedding thermal
currents, etc. The impact of spatial distribution of the sensors on the resulting pollutant spatial distribution and the 3-D
FIR filter model employed also discuss. The case of a neutrally buoyant plume emitted from an elevated point source in a turbulent
boundary layer considers. The results show that wind turbulence is an important factor in the pollutant dispersion and introduces
expected random fluctuations in pollutant distribution and leads to spreading the distribution due to wind mixing. 相似文献
247.
Nelzair A. Vianna Daniel Gonçalves Flavia Brandão Roberta P. de Barros Gilberto M. Amado Filho Rodrigo O. Meire João Paulo M. Torres Olaf Malm Argemiro D’Oliveira Júnior Leonardo R. Andrade 《Environmental science and pollution research international》2011,18(3):416-427
Purpose
The aims of this paper were to quantify the heavy metals (HM) in the air of different sites in Rio de Janeiro (RJ) and Salvador (SA) using Tillandsia usneoides (Bromeliaceae) as a biomonitor, and to study the morphology and elemental composition of the air particulate matter (PM) retained on the Tillandsia surface. 相似文献248.
Kuldeep Ojha 《Environment, Development and Sustainability》2011,13(1):203-215
Many Indian cities are facing serious problems in managing solid wastes with rise in population and urbanization. This article
assesses the existing state of municipal solid waste management (MSWM) in northern India with the aim of identifying the major
obstacles to its efficiency and the prospects for improvisation of the solid waste management system in the region. The existing
solid waste management system in the region is found to be highly inefficient. Primary and secondary collection, transportation
and open dumping are the only activities practiced that too in a non-technical manner. Many cities in region face serious
problems in managing solid wastes. The annual waste generation increases in proportion to the rises in population and urbanization.
This paper systematically assesses the obstacles in the existing solid waste management system in the urban areas of region
and also tries to assess the potentials for its improvisation. 相似文献
249.
Dynamic Games in the Economics and Management of Pollution 总被引:1,自引:0,他引:1
Steffen Jørgensen Guiomar Martín-Herrán Georges Zaccour 《Environmental Modeling and Assessment》2010,15(6):433-467
The paper provides a survey of the literature which utilizes dynamic state-space games to formulate and analyze intertemporal,
many decision-maker problems in the economics and management of pollution. 相似文献
250.
Katrine Banke Nørgaard Nina Cedergreen 《Environmental science and pollution research international》2010,17(4):957-967