In the title mol-ecule (systematic name: methane-tetra-yltetra-methyl-ene tetra-p-toluene-sulfonate), C(33)H(36)O(12)S(4), the central C atom and the S atoms exhibit distorted tetra-hedral configurations. The aromatic rings in opposite arms are nearly parallel to each other, with a dihedral angle of 10.26 (8) or 3.45 (9)°. The mol-ecules are linked into a two-dimensional network parallel to the...

During the last decade several standards for Mobile telecommunications have been developed. The best known is without any doubt the Global Standard for Mobile Communications (GSM) which is operational in many countries, both within and outside Europe. It is now the most successful standard for mobile communications. Also the Digital Enhanced Cordless Telecommunications (DECT) was successfully i...

Current evaluation Conclusion from the previous Monograph: Tetrachloroethylene (Perc) is probably carcinogenic to humans (Group 2A) with the working group finding limited evidence in humans for the carcinogenicity of Perc and sufficient evidence in experimental animals for the carcinogenicity of Perc. In making the overall evaluation, the Working Group considered the following evidence: (i) Alt...

A newborn was noticed lying unattended in the hospital campus. It had complete absence of all four limbs, deformed ears, facial cleft, proptosis, hydrocephalus, corneal opacity, absent nipples, anterior abdominal wall defect with exstrophy bladder, absent external genitalia, and sacral spina bifida (Fig.1 A & B). The child died after few hours due to aspiration pneumonitis. These features are p...

Four new hydroporphyrins [the o, m and p isomers of 5,10,15,20-tetra(hydroxyphenyl)chlorin and 5,10,15,20-tetra(m-hydroxyphenyl)bacteriochlorin] related to the tetra(hydroxyphenyl)porphyrins have been prepared. They show the expected strong absorption bands in the red region of the visible spectrum and are found to be very effective tumour photosensitizers.