Search results for "TOXICITY"

Dentistry and Drug Adverse Events: Between Responsibilities and Regulations

2022

The purpose of this paper is to renew interest and attention to the medical history, prescription, and/or use of drugs during dental practice. The work analyzes the issue of the use of drugs in dentistry from both a clinical and a medical–legal point of view. The laws governing the matter were also taken into consideration, relating them to the roles of prescriber and user that the dentist can acquire. Analysis of various aspects of this matter demonstrates that it is necessary for dentists to know the drugs and medical substances, their characteristics and properties, related effects, and interactions in order to use them appropriately and adequately. Knowledge of interferences, reac…

Acute Toxicity Testing in Vitro and the Classification and Labelling of Chemicals

1996

Cytotoxicity and antileishmanial activity of Annona muricata pericarp

2000

Abstract Hexane, ethyl acetate and methanol extracts of Annona muricata pericarp were tested in vitro against Leishmania braziliensis and L. panamensis promastigotes, and against cell line U-937. The ethyl acetate extract was more active than the other extracts and even of Glucantime® used as reference substance. Its fractionation led to the isolation of three acetogenins — annonacin, annonacin A and annomuricin A.

Cytotoxic Spirostane-Type Saponins from the Roots of Chlorophytum borivilianum

2009

Four new spirostane-type saponins named borivilianosides E-H (1-4) were isolated from an ethanol extract of the roots of Chlorophytum borivilianum together with two known steroid saponins (5 and 6). The structures of 1-4 were elucidated using mainly 2D NMR spectroscopic techniques and mass spectrometry. The cytotoxicity of borivilianosides F (2), G (3), and H (4) and three known compounds was evaluated using two human colon cancer cell lines (HT-29 and HCT 116).

Prediction of acute toxicity of organophosphorus pesticides using topological indices

2007

Topological indices were used in the prediction of the acute toxicity (intraperitoneal and oral LD(50)) of organophosphorus pesticides on rats. Models with six variables for the prediction of LD(50)-i.p. (r = 0.849, Q(2) = 0.613) and eight variables for LD(50)-oral (r = 0.906, Q(2) = 0.701) were selected. External group and cross-validation by use of leave-n-out tests were also performed in order to assess the stability and the prediction performance of the selected topological models.

Acute and short-term toxicity of 2,3,4,6-tetrachlorophenol in rats

1981

Tierexperimentelle Untersuchungen zur Abh�ngigkeit der Ototoxicit�t von der Dosierung des Kanamycin und zur Schutzwirkung durch Vitamine

1963

Mit einer einfachen Methodik wird die durch Kanamycin bei Ratten ausgeloste Horschadigung quantitativ gemessen. Die Abhangigkeit der Schwere der Horschadigung von der Dosis und vom Dosierungsschema wird bestimmt. Der Nachweis, das die Vitamine A oder D eine protektive Wirkung gegenuber der Ototoxicitat des Kanamycin besitzen, kann nicht erbracht werden. Die Folgerungen aus diesen toxikologischen Untersuchungen fur die Anwendung von Kanamycin am Menschen werden kurz erortert.

Physiologische Eigenschaften epoxydierter Öle

1963

Die Verfutterung epoxydierter Ole erwies sich in Futterungsversuchen als nicht harmlos. Die Toxicitat epoxydierter Sojaole nimmt mit steigender Epoxydierung zu. Noch bei einer Tagesdosis von 5 mg Epoxysauerstoff je Ratte (entspricht ca. 50 mg Diepoxystearinsaure) ergaben sich nachteilige Wirkungen (Wachstums-Verzogerung). Verfutterung von 45 mg Epoxysauerstoff je Ratte fuhrten innerhalb von 8 Tagen bei 80% der eingesetzten Tiere zum Tod. Physiological Properties of Epoxydised Oils Feeding of epoxidised oils is shown to be not harmless. The toxicity of the epoxidised soybean oils increases with the increase in epoxidation. A daily dose of 5 mg of epoxy-oxygen to each rat (which corresponds 5…

The toxicity of MCPA to fish. Light and electron microscopy and the chemical analysis of the tissue.

1978

Comparative cytotoxicity evaluation of eight root canal sealers

2017

Background The aim of the present study is to evaluate and compare the cytotoxic effects of eight root canal sealers (BioRoot RCS, TotalFill BC Sealer, MTA Fillapex, Sealapex, AH Plus, EasySeal, Pulp Canal Sealer, N2) on immortalized human gingival fibroblasts over a period of 24, 48 and 72 hours. Material and Methods Immortalized human gingival fibroblast-1 HGF-1 (ATCC CRL-2014) were incubated. Root canal sealers were then placed into sterile, cylindrical Teflon moulds. The extraction was made eluting the sealers in cell culture medium. Cells (1 × 104) were seeded in each well of a 96-well plate and incubated for 24 h at 37°C. Cultures were then exposed to 100 μL of the extracts medium. Th…