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Showing 1 to 17 of 17 for “"artificial substrate"”.
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Patterns of variation in the benthic macroinvertebrate community of the Upper Columbia River, WA
… techniques: benthic sled, benthic drift, and artificial substrates. An analysis of the samples collected by these methods revealed significant discrepancies in the types of organisms caught. Benthic sled and drift methods collected mainly planktonic taxa, primarily small crustaceans. This …
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Impact Of A Diesel Spill On Macroinvertebrate Communities In Ponds In S.E. Alabama, USA
… to allow macroinvertebrates to colonize on the artificial substrate over the winter months. The macroinvertebrates were classified to family or order to compare taxonomic groups at increasing distances from the affected pond. The results of the study seemed to indicate the presence of pollution, …
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An artificial larval medium for colonized Culicoides guttipennis (coquillett) (Diptera: Ceratopogonidae)
An artificial larval medium for colonized Culicoides guttipennis was developed. Microorganisms in decaying leaf matter were present in the original laboratory diet. These were believed to be the main food of C. guttipennis larvae. This was verified by sterilizing the leaf matter to kill the …
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The Influence of Agricultural Chemicals on Aquatic Invertebrate Biodiversity and Genetic Diversity in Northern Prairie Wetlands
… and two were passive samplers (activity trap, artificial substrate). The sampling gears were rated based on the number and diversity of invertebrates captured. The Gerking sampler captured significantly (t c 4.5, P = 0.02) more invertebrates than the other three sampling gear types and also …
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Local effects of culverts on habitat features and fish assemblages in Blue Ridge streams
… stream sites: five sites contained culverts with artificial bottom substrates and five sites contained culverts with natural bottom substrates. On each stream, paired sampling reaches (reach length ~35 times mean reach width, drainage area <11 km 2) were established 50 m upstream and 50 m …
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Macroscopic Benthos Populations in A South Dakota Power Plant Cooling Reservoir
… area of the cooling reservoir was sampled with artificial substrate baskets. Numerically chironomids comprised 65% of all organisms colonizing the baskets. Gravimetrically Physa spp. Comprised 71% of the total mean biomass. This resulted from including the shells in the dry weight. This resulted …
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Macroinvertebrate colonization and production in new experimental ponds
… The ponds were filled in late January 1988, and artificial substrate samples were retrieved at 4-wk intervals from February 25, 1988 to February 25, 1989. The first organisms (<u>Chironomus</u> and ceratopogonidae) were collected 4 wk after filling. Diptera, primarily several genera of …
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The Role of 5' Nucleotidase in the Regulation of Morphogenesis in Dictyostelium Discoideum
… discoideum</i> is an enzyme that shows high substrate specificity to 5'AMP. The enzyme has received considerable attention in the past because of the critical role played by cyclic AMP in cell differentiation in this organism. Degradation of cAMP by cAMP phosphodiesterase (PDE) produces …
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Genetically engineering a new system for the expression of cytochrome P450 enzymes in insect cells using novel P450 reductases
… found that the ability of a CPR to reduce an artificial substrate like MTT is not directly proportional to its ability to reduce the physiological substrate, CYP. In other words, the strength of the reductase does not determine CYP activity but it is the ability of CPR to couple with CYP which …
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Evolution of copper-containing nitrite reductase
… of 105 mutants for folding efficiency or substrate specificity. Initial proof of principle studies yielded several variants that oxidized the artificial substrate ο-dianisidine up to 8 times faster than wild type NiR, suggesting that this methodology has the potential to engineer NiR to …
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Measurement of Phytase Activity in a Clymer Forest Soil Using the TInsP5 Probe
Measurement of soil phytase activity (PA) and delineation of the impact of this important phosphomonoesterase on the P-cycling process in soil and sediments suffer from the lack of a reliable assay. A method for measuring PA in soil that promises to be accurate and reliable has been recently …
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Mechanisms and measurements of sialidase in pneumonia
… of these assays is to either have a detectable substrate or product via a spectroscopic method (e.g. fluorescence) to monitor the rate of the reaction. Neither 3'-sialyllactose,6'-sialyllactose nor their products display intrinsic fluorescence and only have absorbance. Unfortunately, the signals …
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Monitoring and Predicting the Long Distance Transport of Fusarium graminearum, Causal Agent of Fusarium Head Blight in Wheat and Barley
… of F. graminearum. Perithecia were generated on artificial (carrot agar) and natural (corn stalk) substrates. Artificial substrate (carrot agar) produced 15±0.4 perithecia cm-2, and natural substrate (corn stalk) produced 44±2 perithecia cm-2. Individual perithecia were excised from both …
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The macrobenthos of a new reservoir, Lake Anna, Louisa County, Virginia
… involved the use of SCUBA to place and retrieve artificial substrate samplers. This SCUBA method was compared to grab sampling, and found to more reliably estimate macrobenthic community structure. Following impoundment, there was an immediate change in macrobenthic community structure. …
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Probing cellular mechano-sensitivity using biomembrane-mimicking cell substrates of adjustable stiffness
… recognized that mechanical properties of substrates play a pivotal role in the regulation of cellular fate and function. However, the underlying mechanisms of cellular mechanosensing still remain a topic of open debate. Traditionally, advancements in this field have been made using …
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Post-settlement processes and early life history dynamics of zebra mussels (Dreissena polymorpha) in the Hudson River estuary
… manipulated the number of just settled larvae on artificial substrate plates, generating four different settler treatment densities (100%, 50%, 25% and 12.5% natural settlement). I tracked the density of survivors (i.e. recruits) for a year, sampling at various intervals throughout the period. In …
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Application of metamaterial structures in the design, analysis and prototyping of planar : Antennas aplicación de estructuras metamateriales en el diseño, análisis y y prototipado de antenas planas
… newness and the interest that arouses the novel artificial periodic structures called metamaterials allow us to open a field of possibilities for improving planar antenna performances that will be explored with this work. It is possible to be said that the field of the metamaterials applied to …