Equivalent or closely related terms include famine response, starvation mode, famine mode, starvation resistance, starvation tolerance, adapted starvation, adaptive thermogenesis, fat adaptation, and metabolic adaptation.
Introduction. Arches and lintels are found wherever it is necessary to support a wall etc. over an opening which is usually not more than about two metres wide. They provide support in completely different ways and an understanding of this is fundamental to selecting, specifying and assessing them.ntroduction. Arches and lintels are found wherever it is necessary to support a wall etc. over an opening which is usually not more than about two metres wide. They provide support in completely different ways and an understanding of this is fundamental to selecting, specifying and assessing them.
The central feature of an arch is the keystone, or the wedge-shaped stone at the very top of the arch. It is the last stone placed during construction, and it locks all the other stones of the arch into position. The keystone bears almost no weight, but is the center of redirecting the weight of the structure down and outwards. The Romans used arches with circular tops, called rounded arches, which were made of stone.