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Alkaloids (fr. alcali; gr eidos - aspect) has organic heterocyclic substances containing alcohol, with a vegetal origin and basic character, originating as a result of plant secondary metabolism. They give characteristic reactions and their effect on animal organisms is most often toxic. The objective of this study is represented by the systematization of data regarding natural compounds with an alkaloid structure. The paper presents the classification of alkaloids according to compound structure and the type of b...

Anxiety affects thinking, perception and learning and it can cause distortion of perception, reducing the power of concentration and the associative and evocative memory. Anxiety is one of the most common disorders encountered in clinical practice. Anxiety disorders have a significant impact on everyday life, causing the affected person to suffer greatly. Anxiety can be perceived as an inexplicable feeling of impending doom, as an unfounded and exaggerated concern related to everyday life or as an unjustified fear...