EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

PH profiles of the extremely alkaline hindguts of soil-feeding termites (Isoptera: Termitidae) determined with microelectrodes


, : PH profiles of the extremely alkaline hindguts of soil-feeding termites (Isoptera: Termitidae) determined with microelectrodes. Journal of Insect Physiology 42(11/12): 1121-1127

In three of the four subfamilies of higher termites, the anterior hindgut is characterized by an unusually high pH. This phenomenon is especially prominent among the soil (humus) feeders, which represent more than half of all known termite species, but whose digestive physiology is still largely obscure. In this study, we used microelectrodes to determine axial pH profiles in intact guts of the soil-feeding termites Thoracotermes macrothorax, Crenetermes albotarsalis, Noditermes indoensis and two Cubitermes species (all Termitidae: Termitinae). In all species, the pH of the gut contents increased sharply from circumneutral in the midgut to highly alkaline between the midgut-hindgut junction and the first proctodeal dilation (P1). This location coincided exactly with the extent of the mixed segment, a morphologically unique gut region found exclusively among higher termites. The most alkaline pH values occurred in the P1 (pH 11-12.5) and were equal to the highest values ever encountered in biological systems. The second proctodeal dilation (P3) was also alkaline (pH >10), and only in the posterior part of the following segment (P4b) did the gut contents regain a pH close to neutrality. The rectum (P5) was slightly acidic, as was the foregut. Sharp drops of 1-3 pH units were observed between the major gut regions, most notably between P1 and P3, i.e. across the short enteric valve (P2), and also along the P4a. Individual profiles within a species were highly reproducible, as were species-specific differences. The high-resolution profiles presented here show that guts of soil-feeding termites are even more alkaline than reported previously, and they provide sorely needed basic information on microenvironments existing within guts of an extremely important group of terrestrial humivores.

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002914515

DOI: 10.1016/s0022-1910(96)00036-4

Download PDF Full Text: PH profiles of the extremely alkaline hindguts of soil-feeding termites (Isoptera: Termitidae) determined with microelectrodes


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Anonymous, 1983: Outpatient surgery sites serve need. Business Insurance 17(11): 44-44

WeiZhang; CaoYueQing; XiaYuXian, 2008: Cloning of the subtilisin Pr1A gene from a strain of locust specific fungus, Metarhizium anisopliae, and functional expression of the protein in Pichia pastoris. The subtilisin-like protease Pr1A plays a role in insect cuticle breach and has been used in the development of advanced engineered biopesticides. We have identified and cloned the Pr1A gene from a locust specific <i>Metarhizium anisopliae&l...

Reiter, B.; Burger, B.V.; Dry, J., 2003: Mammalian exocrine secretions. XVIII: Chemical characterization of interdigital secretion of red hartebeest, Alcelaphus buselaphus caama. Gas chromatography, coupled gas chromatography-mass spectrometry (electron impact mode and chemical ionization with methane as reactant gas), gas chromatography-infrared spectroscopy, and derivatization techniques were used to identity 53 compound...

Grattan, S.R.; Maas, E.V., 1984: Interactive effects of salinity and substrate phosphate on soybean. When 5 cultivars were grown at 3 levels of salinity and 4 concentrations of inorganic P (Pi), high salinity (-0.44 MPa) in conjunction with Pi <more or => 0.10 M killed Clark and Kanrich, but no foliar injury was apparent on Lee in any treat...

Wrucke, M.A.; Arnold, W.E., 1985: Formulation effects on herbicide retention by crop residue. In a greenhouse experiment, liquid, dry flowable and w.p. formulations of both atrazine and cyanazine were applied to boxes containing wheat straw at a level equivalent to 4000 kg/ha. When simulated rainfall was applied at 0.25 to 25 mm, washoff o...

Bagnell, C.A.; Bryant-Greenwood, G., 2014: Tribute for Dr. Gillian Bryant-Greenwood. Italian Journal of Anatomy and Embryology 118(1 Suppl): 100-101

Zhang, Y.; Riley, L.K.; Lin, M.; Purdy, G.A.; Hu, Z., 2013: Development of a virus concentration method using lanthanum-based chemical flocculation coupled with modified membrane filtration procedures. Direct membrane filtration is often used to concentrate viruses in water but it may suffer from severe membrane fouling and clogging. Here, a lanthanum-based flocculation method coupled with modified membrane filtration procedures was developed an...

Lungu, A.; N,., 1977: A new species of Hipparion from Middle Sarmatian in Moldavia. Unknown

Johnson, J.L.; Nyole, S.; Okwera, A.; Whalen, C.C.; Nsubuga, P.; Pekovic, V.; Huebner, R.; Wallis, R.S.; Mugyenyi, P.N.; Mugerwa, R.D.; Ellner, J.J., 1998: Instability of tuberculin and Candida skin test reactivity in HIV-infected Ugandans. The Uganda-Case Western Reserve University Research Collaboration. Anergy testing has been used as an adjunct to tuberculin testing for assessing M. tuberculosis (MTB) infection and indications for isoniazid preventive therapy in HIV-infected persons. We examined factors associated with the stability of skin test...

Barnes, J.D.; Sharp, Z.D.; Fischer, T.P., 2008: Chlorine isotope variations across the Izu-Bonin-Mariana Arc. Chlorine isotope ratios were determined for volcanic gas, geothermal well, ash, and lava samples along the Izu-Bonin-Mariana volcanic front, serpentinite clasts and muds from serpentine seamounts (Conical, South Chamorro, Torishima), basalts from...