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Добірка наукової літератури з теми "Blowflies Physiology"

Автор: Grafiati
Опубліковано: 4 червня 2021
Оновлено: 28 січня 2023

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Статті в журналах з теми "Blowflies Physiology"

1

Hochstrate, P., and K. Hamdorf. "Microvillar components of light adaptation in blowflies." Journal of General Physiology 95, no. 5 (May 1, 1990): 891–910. http://dx.doi.org/10.1085/jgp.95.5.891.

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The process of light adaptation in blowfly photoreceptors was analyzed using intracellular recording techniques and double and triple flash stimuli. Adapting flashes of increasing intensity caused a progressive reduction in the excitability of the photoreceptors, which became temporarily suppressed when 3 x 10(6) quanta were absorbed by the cell. This suppression was confirmed by subsequently applying an intense test flash that photoactivated a considerable fraction of the 10(8) visual pigment molecules in the cell. The period of temporary desensitization is referred to as the refractory period. The stimulus intensity to render the receptor cell refractory was found to be independent of the extracellular calcium concentration over a range of 10(-4) and 10(-2) M. During the refractory period (30-40 ms after the adapting flash) the cell appears to be "protected" against further light adaptation since light absorption during this period did not affect the recovery of the cell's excitability. Calculations showed that the number of quantum absorptions necessary to induce receptor refractoriness is just sufficient to photoactivate every microvillus of the rhabdomere. This coincidence led to the hypothesis that the refractoriness of the receptor cells is due to the refractoriness of the individual microvilli. The sensitivity of the receptor cells after relatively weak adapting flashes was reduced considerably more than could be accounted for by the microvilli becoming refractory. A quantitative analysis of these results suggests that a photoactivated microvillus induces a local adaptation over a relatively small area of the rhabdomere around it, which includes several tens of microvilli. After light adaptation with an intense flash, photoactivation of every microvillus by the absorption of a few quanta produced only a small receptor response whereas photoactivation of every rhodopsin molecule in every microvillus produced the maximum response. The excitatory efficiency of the microvilli therefore increases with the number of quanta that are absorbed simultaneously.
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2

Komo, Larissa, and Damien Charabidze. "Balance between larval and pupal development time in carrion blowflies." Journal of Insect Physiology 133 (August 2021): 104292. http://dx.doi.org/10.1016/j.jinsphys.2021.104292.

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3

Fukushi, Tsukasa. "Visual learning in walking blowflies,Lucilia cuprina." Journal of Comparative Physiology A 157, no. 6 (November 1985): 771–78. http://dx.doi.org/10.1007/bf01350074.

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4

Campbell, H. R. "Orientation discrimination independent of retinal matching by blowflies." Journal of Experimental Biology 204, no. 1 (January 1, 2001): 15–23. http://dx.doi.org/10.1242/jeb.204.1.15.

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Blowflies, Phaenicia sericata, can be trained to discriminate in a learning paradigm in which one of the two visual cues is positively rewarded. Retinotopic matching of a learned visual image to the same retinal location from viewing to viewing has been hypothesized to underlie visual pattern learning and memory in insects. To address the theory of retinotopic matching, a detailed analysis was made of the flies' body orientations during learned discriminations between +45 degrees and −45 degrees gratings. Initial approaches to the positive rewarded visual cue did not originate from the same spatial location within the behavioral arena with respect to the visual cues; thus, individual flies approached the positive cue from a different vantage point from trial to trial. During initial approaches to the rewarded visual cue, the distributions of body angles with respect to the cue were different from trial to trial for each individual. These data suggest that Phaenicia sericata can learn a visual pattern with one eye region and later recognize the same pattern with another eye region. Thus, retinotopic matching is not necessary for the recognition of pattern orientation in the experimental paradigm used here. The average amount of head turning in the yaw plane was too small to compensate for the changes in body orientation exhibited by the flies. Flies view the visual patterns with distinct retinal regions from trial to trial during orientation discrimination.
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5

Blaj, G., and J. H. van Hateren. "Saccadic head and thorax movements in freely walking blowflies." Journal of Comparative Physiology A 190, no. 11 (July 20, 2004): 861–68. http://dx.doi.org/10.1007/s00359-004-0541-4.

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6

Liscia, A. "Taste Modulators are Tools to Gain a Better Insight into Specific Sensitivity of Chemoreceptors in Blowflies." Chemical Senses 30, Supplement 1 (January 1, 2005): i279—i280. http://dx.doi.org/10.1093/chemse/bjh223.

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7

Park, K. C., and A. Cork. "Electrophysiological responses of antennal receptor neurons in female Australian sheep blowflies, Lucilia cuprina, to host odours." Journal of Insect Physiology 45, no. 1 (January 1999): 85–91. http://dx.doi.org/10.1016/s0022-1910(98)00102-4.

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8

Stavenga, D. G., P. B. W. Schwering, and J. Tinbergen. "A THREE-COMPARTMENT MODEL DESCRIBING TEMPERATURE CHANGES IN TETHERED FLYING BLOWFLIES." Journal of Experimental Biology 185, no. 1 (December 1, 1993): 325–33. http://dx.doi.org/10.1242/jeb.185.1.325.

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A three-compartment model is presented that describes temperature measurements of tethered flying blowflies, obtained by thermal imaging. During rest, the body temperature is approximately equal to the ambient temperature. At the start of flight, the thorax temperature increases exponentially with a time constant of 30 s; in steady flight, a temperature of approximately 30°C is reached (ambient temperature approximately 25°C). After flight, the temperature of the thorax decreases exponentially with a time constant of 50 s. Fitting the time courses of the three body compartments, i.e. head, thorax and abdomen, with the model allows the thermal parameters to be calculated. The metabolic heat produced by a blowfly during tethered flight is estimated to be approximately 23 mW.
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9

Ouyang, Qin, Hiroyasu Sato, Yoshihiro Murata, Atsushi Nakamura, Mamiko Ozaki, and Tadashi Nakamura. "Contribution of the inositol 1,4,5-trisphosphate transduction cascade to the detection of “bitter” compounds in blowflies." Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 153, no. 3 (July 2009): 309–16. http://dx.doi.org/10.1016/j.cbpa.2009.03.004.

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10

Hainsworth, F. R., G. Fisher, and E. Precup. "Rates of energy processing by blowflies: the uses for a joule vary with food quality and quantity." Journal of Experimental Biology 150, no. 1 (May 1, 1990): 257–68. http://dx.doi.org/10.1242/jeb.150.1.257.

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Data on the variation of crop volumes with time for blowflies (Phormia regina Meigen) fed various volumes and concentrations of fructose or sucrose (from Gelperin, 1966, and Edgecomb et al. 1987) were used to characterize energy processing rates to test the assumption of food energy addivity of optimal foraging theories. Six regression models (linear, square root, cube root, hyperbolic, inverse cube root and exponential) were compared for data from Edgecomb et al. (1987) with measurements of crop volumes from 10 min to 5 h after blowflies were fed 9.7 or 14.5 microliters of 0.25 moll-1 sucrose. Only the hyperbolic regression could be discriminated as statistically different, and the linear model was selected as most parsimonious for examining rates of energy processing. About the same volume bypassed the crop for flies fed 9.7 or 14.5 microliters. Volume rates of crop emptying (from Gelperin, 1966) did not change at intermediate concentrations but decreased from lowest and to highest concentrations. Energy processing patterns indicate that long-term storage rates increase with meal size and at intermediate concentrations and decrease (3.0 moll-1 fructose) or remain constant (2.0 moll-1 sucrose) at high concentrations, so the uses for a unit of energy are not additive across concentrations and meal sizes. Animals that process energy in this way should attempt to maximize meal size and include high-energy foods in their diet out of proportion to the amount of energy gained for the time spent foraging.
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Більше джерел

Дисертації з теми "Blowflies Physiology"

1

Morris, Beryl. "Physiology and taxonomy of blowflies." Title page, summary and contents only, 1993. http://web4.library.adelaide.edu.au/theses/09A/09am875.pdf.

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2

Wallman, James Frederick. "Systematics and thermobiology of carrion-breeding blowflies (Diptera: Calliphoridae) /." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phw2142.pdf.

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3

Yetman, Simone. "Central projections of labellar taste hairs in the blowfly Phormia regina Meigen and their positional effects on proboscis extension." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65404.

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4

Wallman, James Frederick. "Systematics and thermobiology of carrion-breeding blowflies (Diptera: Calliphoridae) / by James Frederick Wallman." Thesis, 1999. http://hdl.handle.net/2440/19414.

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Анотація:
Copies of author's previously published articles inserted.
Includes bibliographical references ( 19 leaves).
2 v. : ill. (some col.) ; 30 cm.
Investigates the systematics and thermobiology of carrion-breeding blowflies from southern Australia, with particular emphasis on their forensic application. The results emphasise the limitations of the forensic application of blowflies, particularly for the estimation of time since death.
Thesis (Ph.D.) -- University of Adelaide, Dept. of Environmental Biology, 1999
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5

Liu, Mei-Ann. "Development and evaluation of an in vitro radiochemical assay for juvenile hormone biosynthesis in the black blowfly, Phormia regina (Meigen)." 1985. https://scholarworks.umass.edu/theses/3046.

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6

Qin, Wenhong. "The role of the corpus allatum in the control of life processes in Phormia regina (Meigen)." 1996. https://scholarworks.umass.edu/theses/3072.

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7

Whale, John W. "Population genetic analysis of the black blow fly Phormia regina (Meigen) (Diptera: Calliphoridae)." Thesis, 2015. http://hdl.handle.net/1805/6722.

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Анотація:
Indiana University-Purdue University Indianapolis (IUPUI)
The black blow fly, Phormia regina (Diptera: Calliphoridae), is a widely abundant fly autochthonous to North America. Like many other Calliphorids, P. regina plays a key role in several disciplines particularly in estimating post-mortem intervals (PMI). The aim of this work was to better understand the population genetic structure of this important ecological species using microsatellites from populations collected in the U.S. during 2008 and 2013. Additionally, it sought to determine the effect of limited genetic diversity on a quantitative trait throughout immature development; larval length, a measurement used to estimate specimen age. Observed heterozygosity was lower than expected at five of the six loci and ranged from 0.529-0.880 compared to expected heterozygosity that ranged from 0.512-0.980, this is indicative of either inbreeding or the presence of null alleles. Kinship coefficients indicate that individuals within each sample are not strongly related to one another; values for the wild-caught populations ranged from 0.033-0.171 and a high proportion of the genetic variation (30%) can be found among samples within regions. The population structure of this species does not correlate well to geography; populations are different to one another resulting from a lack of gene flow irrespective of geographic distance, thus inferring temporal distance plays a greater role on the genetic variation of P. regina. Among colonized samples, flies lost much of their genetic diversity, ≥67% of alleles per locus were lost, and population samples became increasingly more related; kinship coefficient values increased from 0.036 for the wild-caught individuals to 0.261 among the F10 specimens. Colonized larvae also became shorter in length following repeated inbreeding events, with the longest recorded specimen in F1 18.75 mm in length while the longest larva measured in F11 was 1.5 mm shorter at 17.25 mm. This could have major implications in forensic entomology, as the largest specimen is often assumed to be the oldest on the corpse and is subsequently used to estimate a postmortem interval. The reduction in length ultimately resulted in a greater proportion of individuals of a similar length; the range of data became reduced. Consequently, the major reduction in genetic diversity indicates that the loss in the spread of length distributions of the larvae may have a genetic influence or control. Therefore, this data highlights the importance when undertaking either genetic or development studies, particularly of blow flies such as Phormia regina, that collections of specimens and populations take place not only from more than one geographic location, but more importantly from more than one temporal event.
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8

Andere, Anne A. "De novo genome assembly of the blow fly Phormia regina (Diptera: Calliphoridae)." Thesis, 2014. http://hdl.handle.net/1805/5630.

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Indiana University-Purdue University Indianapolis (IUPUI)
Phormia regina (Meigen), commonly known as the black blow fly is a dipteran that belongs to the family Calliphoridae. Calliphorids play an important role in various research fields including ecology, medical studies, veterinary and forensic sciences. P. regina, a non-model organism, is one of the most common forensically relevant insects in North America and is typically used to assist in estimating postmortem intervals (PMI). To better understand the roles P. regina plays in the numerous research fields, we re-constructed its genome using next generation sequencing technologies. The focus was on generating a reference genome through de novo assembly of high-throughput short read sequences. Following assembly, genetic markers were identified in the form of microsatellites and single nucleotide polymorphisms (SNPs) to aid in future population genetic surveys of P. regina. A total 530 million 100 bp paired-end reads were obtained from five pooled male and female P. regina flies using the Illumina HiSeq2000 sequencing platform. A 524 Mbp draft genome was assembled using both sexes with 11,037 predicted genes. The draft reference genome assembled from this study provides an important resource for investigating the genetic diversity that exists between and among blow fly species; and empowers the understanding of their genetic basis in terms of adaptations, population structure and evolution. The genomic tools will facilitate the analysis of genome-wide studies using modern genomic techniques to boost a refined understanding of the evolutionary processes underlying genomic evolution between blow flies and other insect species.
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