Gas Transport in the Haemolymph of Arachnids - Carbon Dioxide Transport and Acid-base Balance

نویسندگان

  • Paul
  • Pfeffer-Seidl
  • Efinger
  • PÖRtner
  • Storz
چکیده

The relationships between PCO2 and pH were determined in cell-free undiluted haemolymph of the arachnids Eurypelma californicum, Pandinus imperator and Cupiennius salei. The pH/bicarbonate diagrams and the CO2 equilibrium curves were calculated, using the Henderson­Hasselbalch equation, for haemolymph sampled at rest and during recovery from exercise. The calculations of solubility (alphaCO2) and dissociation constant (pK"') were based on additional ion concentration measurements. Blood gas analyses corroborate these results: after locomotor activity, there is a metabolic acidosis linked to the accumulation of lactate in the haemolymph. The concentration of bicarbonate in the haemolymph of resting individuals is quite different in the three species and is related to the extent of post-exercise bicarbonate depletion. During early recovery, buffering in the haemolymph strongly depends upon CO2 release. Potassium and magnesium concentrations in the haemolymph increase after exercise. During cold-acclimation (to 10 °C), there is a metabolic acidosis in the tarantula's haemolymph that is linked to the accumulation of acetate.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Gas Transport in the Haemolymph of Arachnids - Oxygen Transport and the Physiological Role of Haemocyanin

Oxygen equilibrium curves and the relationships between the partial pressure of CO2 and pH were determined for the haemolymph of the arachnids Eurypelma californicum, Pandinus imperator and Cupiennius salei. A new type of experimental apparatus was constructed, tested and used to make these measurements on small undiluted cell-free haemolymph samples. Most of its components were made in our wor...

متن کامل

Modeling and Experimental Study of Carbon Dioxide Absorption in a Flat Sheet Membrane Contactor

comIn the present study, CO2 removal from natural gas stream has been studied using a flat sheet membrane contactor. A three dimensional mathematical model is developed to describe the process. The model considers the transport of a gas mixture containing carbon dioxide and methane through a flat sheet membrane contactor module. The model is based on the non-wetted mode of operation, in which t...

متن کامل

Oxygen Transport and Acid-base Balance in the Haemolymph of the Lobster, Homarus Gammarus, during Aerial Exposure and Resubmersion

Submerged lobsters at 15°C were normoxaemic (CaO2 = 0-52 mmol 1~ 1 at a PaO2 of 6-53 kPa) and normocapnic (Paco2 = 0-44kPa; [HCO3~] = 9-3mequivl~ 1 and pHa = 7-78). After 3h in air the haemolymph was markedly hypoxic and hypercapnic (Paoj= 1-6 kPa; C a o ^ 0-2 mmol I"; Paco2 = 0-7kPa and pHa = 7-64). Disturbance after 3h in air caused a greater increase in PacO2 to 1-28 kPa and a fourfold incre...

متن کامل

Effects of hypercapnia on acid–base balance and osmo-/iono-regulation in prawns (Decapoda: Palaemonidae)

Anthropogenic carbon dioxide-induced ‘ocean acidification’ is predicted to have major implications for marine organisms. As the oceans becomes increasingly hypercapnic (elevated CO2) and seawater pH decreases, the ability of organisms to maintain extracellular pH homeostasis (acid– base balance) may be compromised. Acid–base regulation occurs by ionic transport, where hydrogen and bicarbonate i...

متن کامل

Measurement and Analysis of Green Energy Economy Indicators in Iran (Measurement of Carbon Dioxide Emission and its Elasticity)

Achieving sustainable economic growth is one of the most important goals of countries' economic programs and policies in the current era. Along with economic growth, consumption of energy rises. Since fossil fuels provide a major share of the world's energy, increased fuel consumption is an inevitable feature of economic growth.  Continuation of this trend increases greenhouse gas emmissions, n...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Journal of experimental biology

دوره 188 1  شماره 

صفحات  -

تاریخ انتشار 1994