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Monday, July 6, 2020 | History

2 edition of Uric acid synthesis in the blood-sucking bug Rhodnius prolixus (Stal) found in the catalog.

Uric acid synthesis in the blood-sucking bug Rhodnius prolixus (Stal)

Frank Michael Barrett

Uric acid synthesis in the blood-sucking bug Rhodnius prolixus (Stal)

by Frank Michael Barrett

  • 313 Want to read
  • 4 Currently reading

Published in [Toronto] .
Written in English

    Subjects:
  • Rhodnius prolixus,
  • Uric acid

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Paginationiii, 142 leaves.
    Number of Pages142
    ID Numbers
    Open LibraryOL18952630M

    Uric acid levels can vary based on sex. Normal values for women are to milligrams/deciliter (mg/dL) and for men to mg/dL. However, the values may vary based on the lab doing the. High levels or uric acid, one of the body’s waste products, can be a sign of gout or kidney stones. Learn what a uric acid blood test tells you, how it’s done, and what the results mean.

      R. prolixus also has a haem-binding antioxidant protein 9 and unusually high titres of uric acid (a free-radical scavenger) in its haemolymph Building an array of defences against haem.   A theory of uric acid excretion is put forward according to which potassium or sodium acid urate is secreted in solution in the upper part of the Malpighian tube, and water and base reabsorbed from the lower part of the tube, leading to a precipitation of free uric acid; so that the same water and base are circulated and used repeatedly. The evidence for this theory is presented under Cited by:

      Elevated serum uric acid levels are associated with non-alcoholic fatty liver disease independently of metabolic syndrome features in the United States: Liver ultrasound data from the National Health and Nutrition Examination Survey. Uric Acid Rectal Wall and Friend, W. G., , Uric acid synthesis in Rhodnius prolixus, J. Insect Physiol. – PubMed CrossRef Google Scholar. Barton Browne, L., , Water regulation in Excretion in the blood-sucking bug, Rhodnius prolixus Stâl. III. The control of the release of the diuretic hormone, J. Exp. Biol.


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Uric acid synthesis in the blood-sucking bug Rhodnius prolixus (Stal) by Frank Michael Barrett Download PDF EPUB FB2

Here we show that treatment of Rhodnius fat bodies with okadaic acid, an inhibitor of protein phosphatases (31, 32), greatly enhances uric acid release (Fig.

This result suggests that purine metabolism depends on protein phosphorylation in the fat body cell. We have shown that hemin stimulates urate synthesis in the blood-sucking insect Rhodnius prolixus (Graça-Souza, A. V., Petretsky, J. H., Demasi, M., Bechara, E. H., and Oliveira, P. () Free Radical Biol.

Med. 22, –). Once released by fat body cells, urate accumulates in the hemolymph, where this radical scavenger constitutes. The present study was undertaken to determine the origin of the carbon atoms of uric acid synthesized by the blood-sucking bug, Rhodnius prolixus (Stal).

Since fifth instar larvae of this insect ingest up to nine times their body weight in a single feeding of mammalian blood (FRIEND et al., ), they must eliminate considerable amounts of nitrogenous by: Urate at high concentrations (up to 5 mM) is found in the hemolymph of the blood-sucking bug, Rhodnius prolixus.

Increased urate levels are observed in the days following a blood meal. Injecting hemin into the hemocoel increases both urate titer and TBARS formation in the by: The blood-sucking bug, Rhodnius prolixus Still, also rapidly eliminates uric acil after one of its large blood meals (Wigglesworth, a).

Wigglesworth () proposed a widely accepted model (Chapman, ; Roeder, ) for excretion of uric acid by the Malpighian tubules of adult Rhodnius, in which urate is first transpor-Cited by: See also p.BALDWIN & SHAVER, Radiation-Induced Sterility in the Insect Rhodnius by: Secretion of primary urine by upper Malpighian tubules of the blood-sucking insect Rhodnius prolixus has recently been shown to be inhibited by cyclic GMP (cGMP).

In the present work, we have demonstrated that cGMP has effects antagonistic to those of cAMP in Rhodnius tubules and have further characterized the effects of cGMP on tubular secretion. Symbiotic Bacteria in a Blood-sucking Insect, Rhodnius Prolixus Stål.

(Hemiptera, Triatomidae) - Volume 28 Issue 2 - V. WigglesworthCited by: Uric acid is the main nitrogenous excretion product in insects as well.

The additional glycine required by these insects in periods of growth may be due to its incorporation into uric acid.

The techniques used in this experiment indicate that glycine is an essential amino acid for R. prolixus. Background Studying the behavioral response of blood-sucking, disease-vector insects to potentially repellent volatile compounds could shed light on the development of new control strategies.

Volatiles released by human facial skin microbiota play different roles in the host-seeking behavior of triatomines. We assessed the repellency effect of such compounds of bacterial origin on Triatoma Author: Melanie Ramírez, Mario I.

Ortiz, Pablo Guerenstein, Jorge Molina. High plasma uric acid (UA) is a precipitating factor for gout and renal calculi as well as a strong risk factor for Metabolic Syndrome and cardiovascular disease.

The main causes for higher plasma UA are either lower excretion, higher synthesis or both. Higher waist circumference and the BMI are associated with higher insulin resistance and leptin production, and both reduce uric acid by: The concentration of uric acid in the haemolymph of fifth-instar larvae of Rhodnius prolixus ranged from 95 to 170 mg/ ml.

In insects unfed for from 32 to 66 days it varied from 99 to 150 mg/ ml; insects unfed for the longest periods of time had the highest concentrations.

Synthesis of uric acid and proteins is supposed to be a normal process. In birds urea is converted into uric acid in the liver. Moreover, it has been shown that in birds the greater part of uric acid is not derived from purines but by a process of synthesis from lactic acid and ammonia. BENEDICT JD, FORSHAM PH, STETTEN D., Jr The metabolism of uric acid in the normal and gouty human studied with the aid of isotopic uric acid.

J Biol Chem. Nov; (1)– BISHOP C, GARNER W, TALBOTT JH. Pool size, turnover rate, and rapidity of equilibration of injected isotopic uric acid in normal and pathological subjects. Barrett, F. M., and Friend, W. G.,Uric acid synthesis in Rhodnius prolixus, J. Insect Physiol.

– CrossRef PubMed Google Scholar. Triatomine bugs are blood-sucking insects, vectors of Chagas disease. Despite their importance, their oviposition behavior has received relatively little attention. Some triatomines including Rhodnius prolixus stick their eggs to a substrate.

It is known that mechanical cues stimulate oviposition in this species. However, it is not clear if chemical signals play a role in this by: 4. O’Donnell M, Maddrell S, Gardiner B () Transport of uric acid by the Malpighian tubules of Rhodnius prolixus and other insects. J Exp Biol (1)– Google Scholar Orona-Tamayo D, Heil M () N fixation in insects: its potential contribution to N cycling in ecosystems and insect biomass.

Uric acid nephrolithiasis isessentially the renal manifestation of a systemic metabolic disorder. The primarydriver for uric acid stones is a low urine pH, leading to precipitation of insolubleuric acid.

Less deciding factors are hyperuricosuria and low urine by: Download the file containing the chromosome-length (2n=22) assembly of the rhodnius prolixus kissing bug genome. All modifications with respect to the draft (see below) are annotated in the Rhodnius_prolixusassembly file.

Some basic stats associated with the new reference, Rhodnius_prolixus, are listed below. Haematophagy is costly: Respiratory patterns and metabolism during feeding in Rhodnius prolixus of the blood-sucking bug, Rhodnius prolixus. Exp. The mechanism of uric acid. Uric acid is the principal nitrogenous excretory product of insects (Wyatt ), and more than 90% of the nitrogen excreted by fed Rhodnius prolixus is represented by this metabolite.Maddrell, S.

H. P.,Excretion in the blood-sucking bug, Rhodnius prolixus StaI. III. The control of the release of the diuretic hormone. The control of the release of the diuretic hormone. : Cedric Gillott.This increasing trend of uric acid levels and hyperuricemia in turn has translated into an increasing disease frequency of gout in several populations (Table 3), including the US (14, 19, 30–32), UK and Maori (33–35) incidence of gout appeared to increase in the US, from 45/, during –78 to /, during –96 in Rochester, Minnesota ().