New toxic substances in certain tuberculin, O.T., and B. typhosus culture filtrates are described. These substances are capable of eliciting the hemorrhagic necrosis characteristic of the phenomenon of local skin reactivity provided heterologous bacterial filtrates of high potency are used either for the intradermal or the intravenous injection. The toxic substances apparently have no relations...

Public interest in substances with marine origin is very recent in comparison to that of terrestrial plants that dates back to our origins as nomadic hunter-gatherers. Our ancestors made the distinction between edible plants some of which they eventually cultivated as humans became sedentary and toxic substances that could serve as remedies once properly prepared and administered during special...

dental materials that are used in dentistry should be harmless to oral tissues, so they should not contain any leachable toxic and diffusible substances that can cause some side effects. reports about probable biologic hazards, in relation to dental resins, have increased interest to this topic in dentists. the present paper reviews the articles published about biocompatibility of resin-restora...