In this note I review evidence suggesting that shortages of small change occurred in the territory of Argentina during the end of the eighteenth and the beginning of the nineteenth centuries. For the colonial period (until 1810) the main pieces of evidence are: (i) the widespread use of informal means of payment, (ii) the difficulties faced in retiring from circulation low quality subsidiary co...

Phenazines and heterocyclic N-oxides have proven to be interesting classes of antitumoral as well as antibiotic agents . The natural product myxin (1-hydroxy-6-methoxyphenazineN5, N10-dioxide) which belongs to both of these unique classes of molecules, has been found to cause bio-reductively activated, radical-mediated DNA strand cleavage via a de-oxygenative mechanism, making it a potential an...

sensitive strain, after continued passage through treated mice, became so m-esistant to 4-amino-N10-methyl-PGA2 that no prolongation of survival time i-csulted from the usual therapeutic cout-se of the drug. After fifteen passages through treated animals, this strain of leukemia (Ak4R) was then passed through ten generations of untreated animals with no loss of resistance.3 Similar resistance o...

Abstract The response of beaches to typhoons has always been a hot topic at home and abroad. study beach changes during is helpful deepen the understanding evolution important for coastal ecological environment. Based on observation results ten profiles sediment samples in Chudao before after typhoon Lekima, this article explored characteristics typhoon. showed that area was located right side ...

The gold standard was quite stable in the past: price level changes were relatively small, and trade cycles mild. However, its past stability does not guarantee nowadays. We show that of to shocks stemming from world market depends critically on size monetary stock relative extent these shocks. Every change decreasing lowers stability. discuss some consequences thesis too: first, any system eco...