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Almost every effort in the care of patients with heart disease begins with some description of disordered physiologic performance or mor phologic anatomy. Since the early work of Edler and Hertz in 1954, echocardiographic methods have grown in importance and reliability for the diagnosis of many cardiac disorders. The placement of a maneuverable transducer on the tip of a modified endoscope is the result of relatively recent technologic advances. The transesophageal approach is now a reality for obtaining new information from ultra-sonic images of a beating human heart. Since images obtained...

- End: pro't and loss account. As a result, there will be a stage at which the parties have developed relations and prospects of gain, while there are still a number of problems that are dif?cult to solve and that fail to evoke consensus. Each party will then draw up a pro't and loss account. On the positive side of the balance are the relations developed and the gains collected, on the negative side there are the losses and the unsolved problems. For particular parties, who have no interest in the problem, the latter side is uninteresting; for others, who have an interest in a particular...

For a long time microbial ecology has been developed as a distinct field within Ecology. In spite of the important role of microorganisms in the environment, this group of 'invisible' organisms remained unaccessable to other ecologists. Detection and identification of microorganisms remain largely dependent on isolation techniques and characterisation of pure cul- tures. We now realise that only a minor fraction of the microbial com- munity can be cultivated. As a result of the introduction of molecular methods, microbes can now be detected and identified at the DNA/RNA level in their natural...