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In the present paper the idea about the cycles discovered by Dr. Hans Krebs is given. The career of Dr Krebs in Germany and England is outlined and his cycles are described in details. It is given also the evaluation of his discovery both about life and development of the biology as well. [ABSTRACT FROM AUTHOR]

The history of discovery of DDT (dichlorodiphenyltrichloroetha ne) is described in the present article. The insecticide DDT was broadly used in agriculture, medicine and human life. However, in our days, this substance is in the list of forbidden for using substances. [ABSTRACT FROM AUTHOR]

The present paper tells the history of wine produced by fermentation of the grapes. Grapes ferment without the addition of sugars and convert to ethanol (C2H5OH) and carbon dioxide (CO2). The earliest evidence of wine to date was found in Caucasus but also in Mesopotamia. Archaeological evidence has established the earliest-known production of wine from fermenting grapes during the late Neolithic site of Hajji Firuz in the northern Zagros Mountains. In the paper was given also the compounds which are characteristic for the wine and the methods of discovering them. [ABSTRACT FROM AUTHOR]

The paper summarizes all papers published by Bulgarian scientists in the field of archaeometry, issued in the last decade. The archaeometric investigations in Bulgaria cover the analyses of chemical composition of bronze, gold, silver, lead, glass, glaze, pottery, mortar, amber, resin and other archaeological objects. For their characterization many instrumental techniques such as AAS, ED-XRF, ICP-AES, INAA, LA-ICP-MS, SEM-EDS, etc. are used. These techniques, together with geophysical methods, archaeomagnetic investigations, dendrochronology and the various dating methods are all covered by the umbrella term 'archaeometry'. MA programme in archaeometry has been offered in Sofia University 'St. Kl. Ohridski' in the last 10 years, whose graduates have been joining archaeological investigations professionally. In this way, archaeology is enriched with new understanding of the role of physics, chemistry, biology and geology. [ABSTRACT FROM AUTHOR]