INTRODUCTION. THE work of Hertwig (1912) on the frog has shown that "over-ripening" of the eggs leads to an effective modification of the sex-ratio in the direction of an increased production of males. Adler (1920) examining the thyroids of the larvae arising from such " over-ripe" fertilised eggs found that they are larger than in normal individuals, and that the differentiation of the thyroid...

s of the Second ASM Conference on Antimicrobial Resistance in Zoonotic Bacteria and Foodborne Pathogens in Animals, Humans and the Environment, Toronto, 2010. Abstract 87A, p. 13. American Society for Microbiology, Washington, DC, USA. 3 Garcı́a-Fernández A, Fortini D, Veldman K et al. Characterization of plasmids harbouring qnrS1, qnrB2 and qnrB19 genes in Salmonella. J Antimicrob Chemother 200...

In [7] Hertwig et al. draw a distinction between decisions from experience and decisions from description. In a decision from experience an agent does not have a summary description of the possible outcomes or their likelihoods. A career choice, deciding whether to back up a computer hard drive, cross a busy street, etc., are typical examples of decisions from experience. In such decisions agen...

Many years ago Hertwig (1) and Dalcq (2) showed that trypaflavine has the property of inactivating the frog sperm nucleus without affecting the extranuclear parts of the cell. Following an appropriate treatment with the dye, the sperm cells still retain their capacity to activate eggs, but contribute no chromosomes to the resulting embryos, which then develop as haploids with the maternal chrom...

Indiscriminate and excessive uses of antibiotics may be lead promote the emergence of antibiotic-resistant microorganisms and side effects in patients. Therefore the researchers recently have focused on the use of natural resources, especially medicinal plants. Ruta graveolens is a kind of medical plants which contains antifungal and antibacterial components and use in traditional medicine in I...