Microanalytical techniques are used to show that organic molecules play an important role is osmoregulation. Changes in the inorganic ion composition of haemolymph from fourth instar larvae of Aedes aegypt} are correlated with the changes in the concentration of organic ions. Free amino acids have a significant role in regulating haemolymph osmotic pressure with respect to the osmotic pressure ...

The desert locust Schistocerca gregaria is a destructive pest for several crops, particularly which are considered as the main food sources human and animals. Much attention has been paid to use plant extracts or products controlling this pest. present study aimed investigate disturbing effect of Nimbecidine on phosphatase activity in S. gregaria. penultimate instar nymphs were treated, through...

1. The drinking rate of the saline-water mosquito larva Aedes taeniorhyncus (100 nl.mg-1.h-1) is unaffected by the salinity of the external medium, but is directly proportional to the surface area of the animal. 2. Haemolymph Na+, Mg2+, K+, Cl-, SO42- and osmotic concentrations were measured in larvae adapted to 10%, 100% and 200% seawater and were found to be regulated within a narrow range. ...

Immunoadsorption, Ecdysteroids, Calliphorin, Steroid-Binding Protein, Photoaffinity-Labelling Endogenous ecdysteroids as well as radiolabelled exogenous ecdysone were crosslinked to a protein when haemolymph from blowfly larvae was irradiated with UV-light under optimized conditions. This indicates that larval haemolymph of blowflies contains an ecdysteroid-binding protein. The crosslinked ecdy...

-1. Amounts of glycogen and glucose in locust haemolymph and fat body increase during the first 15 rain of flight but later fall to below the resting values. 2. Amounts of trehalose in haemolymph and glycogen in gut wall decline throughout flight. 3. Variations in the concentrations of free amino acids in haemolymph are reported. 4. The concentration of lipid in the haemolymph increases to abou...

In a recent paper (Ramsay, 1950 a) an investigation of the osmotic relations of the larvae of Aedes species was reported. Measurements of freezing-point depression were made on fluids collected from various parts of the body. In the case of A. aegypti, a fresh-water species, it was found that the fluid eliminated from the anus was strongly hypotonic to the haemolymph; the fluid entering the rec...

Nondestructive techniques to obtain DNA from organisms can further genetic analyses such as estimating genetic diversity, dispersal and lifetime fitness, without permanently removing individuals from the population or removing body parts. Possible DNA sources for insects include frass, exuviae, and wing and leg clippings. However, these are not feasible approaches for organisms that cannot be r...

The haemolymph of Rhodnius is rich in amino acids. During the rapid diuresis after a blood meal, no more than trace amounts of amino acids are lost in the urine. There is no significant reabsorption of amino acids in the excretory system. That they escape elimination can instead be attributed to a combination of the low permeability of the Malpighian tubules to amino acids, the very high rate o...

The oxygen-transporting properties of the haemolymph from the crayfish Austropotamobius pallipes were investigated. The haemolymph concentrations of K, Mg^ and Ca ions, together with the concentration of L-lactate were measured in crayfish before, during and after 24 h emersion. The concentrations of K and Mg"" increased during aerial exposure and returned to pre-emersion levels during immersed...