Electric light sources could produce flickers that might have biological effects. Although flicker is not always visible to the human eye, it may impact certain health. Eye strain, headaches, migraines, impaired vision, and, in sensitive people, photo epilepsy are just a few of negative impacts flicker. Many international organisations been working on lighting standards measurement response gro...

Orthodontic treatment of individuals with metal hypersensitivity is a matter of concern for the orthodontist. Orthodontic appliances contain metals like Nickel, Cobalt and Chromium etc. Metals may cause allergic reactions and are known as allergens. Reaction to these metals is due to biodegradation of metals in the oral cavity. This may lead to the formation of corrosion products and their expo...

SINCE the high incidence of iatrogenic hypothyroidism (40%/. eight years after treatment) in thyrotoxic patients treated with radioiodine was appreciated, the radiobiology of the thyroid gland has 'become a subject of great clinical importance. The method of treatment in its orthodox form and dosage is clearly unsatisfactory and efforts are being made to improve it in various centres. Unfortuna...

The study of the biological effects of ionizing radiation started practically at the same time as the discovery of X-rays in 1895. Since the techniques and methods accepted today to quantify radiation dose were absent at that time, first findings and studies were barely qualitative. Nonetheless, harmful effects to man and to laboratory animal species from ionizing radiation were already observe...

INTRODUCTION. The information herein has been compiled from official publications of the Department of the Army, Office 0f Civil and Defense Mobilization, Department of Health, Education and Welfare, and from other sources. No classified material is included. This is not a substitute for the technical details in other official and more voluminous publications, but has been prepared as a guide t...