Morphological changes in human head hair subjected to various drug testing decontamination strategies

Morphological changes in hair subjected to decontamination protocols were evaluated by scanning electron microscopy (SEM) as part of the National Laboratory Certification Program's (NLCP) efforts to develop proficiency testing materials in support of Federal Workplace Drug Testing programs. Hair from five different donors was evaluated. Hair samples were subjected to three decontamination protocols: (1) aqueous phosphate buffer, (2) methanol or (3) methylene chloride as models for aqueous, alcohol and polar organic solvent protocols, respectively. Under these protocols, samples of hair were treated for 225 min (aqueous), 15 min (alcohol), or 15 min (polar organic). After decontamination, hair strands were sputter coated with gold/palladium (AuPd) and observed by SEM. Modest lifting of cuticle scales was observed in hair treated with methanol and methylene chloride consistent with some changes to the cell membrane complex (CMC) between cuticle scales. Damage resulting from aqueous buffer treatment ranged from substantial degradation to apparent complete loss of cuticle scales. Fracture structures consistent with cuticle damage were also observed. Each decontamination protocol had a different impact on the cuticle of the hair shaft.     

Comments on the paper by D. Tausch et al. Experiments on the penetration power of various bullets into skin and muscle tissue (author's transl)]

The objections in the following comments on a recent paper by Tausch et al. (1978) are raised principally to the points that the mass of the projectile is given an importance for the penetration which is not justified, and that the inherent uncertainty of the measurement data and the scope of validity of the empirical formulas are not sufficiently taken into account. The discussion on the process of penetration and a discontinuity of the depth of penetration as a function of the velocity of the bullet is of fundamental significance, with consequences for the definition of the critical velocity.     

International Cooperation on Harmonisation of Technical requirements for Approval of Veterinary Medicinal Products (VICH); final guidance on " Safety studies for veterinary drug residues in human food: reproduction toxicity testing" (VICH GL22); availability. Notice

The Food and Drug Administration (FDA) is announcing the availability of a final guidance for industry (#115) entitled "Safety Studies for Veterinary Drug Residues in Human Food: Reproduction Toxicity Testing"(VICH GL22). This final guidance has been adapted for veterinary use by the International Cooperation on Harmonisation of Technical Requirements for Registration of Veterinary Medicinal Products (VICH) from a guidance regarding pharmaceuticals for human use, which was adopted by the International Conference on Harmonisation of Technical Requirements for Approval of Pharmaceuticals for Human Use (ICH). This final VICH guidance document recommends a basic battery of tests that can be used to evaluate the reproduction safety of veterinary drug residues in human food.     

International Cooperation on Harmonisation of Technical Requirements for Approval of Veterinary Medicinal Products (VICH); final guidance for industry on "studies to evaluate the safety of residues of veterinary drugs in human food: genotoxicity testing" (VICH GL23); availability. Notice

The Food and Drug Administration (FDA) is announcing the availability of a final guidance for industry (116) entitled "Studies to Evaluate the Safety of Residues of Veterinary Drugs in Human Food:Genotoxicity Testing" (VICH GL23). This final guidance has been adapted for veterinary use by the International Cooperation on Harmonisation of Technical Requirements for Registration of Veterinary Medicinal Products(VICH) from a guidance regarding pharmaceuticals for human use, which was adopted by the International Conference on Harmonisation of Technical Requirements for Approval of Pharmaceuticals for Human Use (ICH). This final VICH guidance document recommends a basic battery of tests that can be used to evaluate the genotoxicity of veterinary drug residues in human food in the European Union, Japan, and the United States