Item no.: P4010711 Principle Interactive learning and teaching system with one neurosimulator for up to 30 experiments covering nerve cells. Tasks use the nerve function model to study the following aspects of a nerve cell: intercellular potential, action potential, the different types of synapses. What you can learn about Comparison between low and high threshold and
Item no.: P4140200 Principle Microorganisms are ubiquitous, i.e. they are present everywhere around us. This fact can be proved by touching the objects that are to be examined in view of the presence of microorganisms against the sterile nutrient medium in a Petri dish and by incubating the plates afterwards. The easy working methods that
Item no.: P4120360 Principle The enzymatic hydrolysis of urea in aqueous solution liberates carbon dixide and ammonia. The ions of these compounds increase the conductivity of the solution. Conductivity measurements can so be made to determine the rate of hydrolysis of urea by the enzyme urease at various substrate concentrations. Tasks The Michaelis constant can
Item no.: P4070760 Principle Electronystagmography (ENG) is an electrophysiological diagnostic procedure for measuring the movement of the eyes. Several electrodes measure the potential differences that are caused by the eye movements. When looking at a moving, regular, repetitive pattern (e.g. the wagons of a passing train, stripes on a rotating drum), the eyes usually try
Item no.: P4070300 Principle As excitation of the light-perceptive cells of the retina always takes a little longer than the light stimulus, only a limited number of stimuli per unit of time can be processed (time-related resolving power of the eye). If a light source is switched on and off periodically in increasingly rapid sequence
Item no.: P4030211 Principle Tapping the Achilles tendon stretches the calf muscle and causes a reflex contraction in the muscle. This happens because the spindles sense the stretch and send an action potential to the motor neurons which then cause the muscle to contract. The amplitude of the muscle action potential is higher with tensed arm musculature
Item no.: P1522160 Principle An electrocardiogram (ECG) can record the sum of the electrical activities of all of the heart muscle fibres. Under stress, cardiac activity increases in order to maintain the stability of the cardiovascular system. The heart contraction cannot be controlled at will. This experiment enables you to study how physical stress affects
Item no.: P5950100 Principle This set-up shows how blood flow studies are performed using Doppler ultrasound (Doppler sonograph). On a realistic arm dummy, the differences between continuous (venous) and pulsating (arterial) flow are shown as well as the difference in flow through a normal blood vessel and a stenosis. Tasks Analyse blood flow and search
Item no.: P4010111 Principle Earthworms have a median giant nerve fibre, which reacts to stimulation at the front end, and two lateral giant fibres, which can be stimulated at the rear end. The experiment covers the following topics: the course of a biphasic action potential over time, estimation of the conduction velocity and coding of
Item no.: P4110260 Principle Photosynthesis leads to the production of oxygen, which in turn causes the pressure to rise. In this experiment the photosynthesis rate of a plant is determined by measuring the oxygen pressure increase, in white and green light as well as in the dark. Tasks To compare the increase in oxygen pressure