Summary. 1  Algae are a necessary component of any healthy natural pond ecosystem. 2  However, excessive inputs of nutrients can lead to an overabundance of algae. 3  Excessive growth of filamentous algae, referred to as mats, moss, or scum, is one of the most common problems encountered by pond owners.
From Wikipedia, the free encyclopedia. The history of radiation therapy or radiotherapy can be traced back to experiments made soon after the discovery of x-rays (1895), when it was shown that exposure to radiation produced cutaneous burns.ases sprung up of the development of carcinoma in patients who had used conventional radium therapy up to 40 years after the original treatments. Robley D. Evans made the first measurements of exhaled radon and radium excretion from a former dial painter in 1933.
Rational Emotive Behavioral Therapy (REBT) Rational emotive behavioral therapy (REBT), developed by Albert Ellis in 1955 and originally called rational therapy, laid the foundation for what is now known as cognitive behavioral therapy. REBT is built on the idea that how we feel is largely influenced by how we think. As is implied by the name, this form of therapy encourages the development of rational thinking to facilitate healthy emotional expression and behavior.