Scientific contributions of Leo Khachiyan (a short overview)

Remembering Leo Khachiyan

“They are like old soldiers,” said Leo and once again I marvelled at his knack for distilling the essence in just a few words. We were sitting high up in the stadium, Leo Khachiyan, my wife Markéta, and I. Three people with a university education and not one of us had the sense to bring along a hip flask. So now we were shivering in the cold October evening while down below Mick and Keith swagg...

My Memories of Leonid Khachiyan and a Personal Tribute for His Contributions in Linear Programming

Contributions to the taxonomy of the genus Anticharis (Scrophulariaceae) especially in Namibia and Angola

A taxonomic overview of the genus Anticharis (Scrophulariaceae) especially in Namibia and Angola is presented. Three new species are described, viz. A. namibensis B. Nord., A. kaokoensis B. Nord. and A. angolensis B. Nord. A key to the Anticharis species of Namibia and Angola is presented. Some aspects of phytogeography, molecular phylogeny and photosynthetic pathways (C3-C4) are briefly discus...

An Overview of Mathematical Contributions of Ghiyath al-Din Jamshid Al-Kashi [Kashani]

In this paper, we study Ghiyath al-Din Jamshid al-Kashi's (1380-1429 A.D.) main mathematical achievements. We discuss his al-Risala al-muhitiyya ("The Treatise on the Circumference"), Risala al-watar wa'l-jaib ("The Treatise on the Chord and Sine"), and Miftah al-hisab ("The Key of Arithmetic"). In particular, we look at al-Kashi's fundamental theorem, his calcula...

A short overview about cadmium and its toxicity focused on humans, bioindicators and model organisms

According to Paracelsus (1493-1541) everything from this planet is poison, only the dose makes the poison to be harmless. Even the essential elements for life support are toxic for all organisms in high amounts. Mercury, cadmium, metalloid arsenic and lead were responsible for poisoning and death of many humans and life forms from this planet for centuries. Cadmium forms different compounds tha...