Chapter 057 Photosensitivity and Other Reactions to Light (Part 1) pps

... penetrates to the dermis and is capable of altering structural and matrix proteins that contribute to photoaging of chronically sun- exposed skin, particularly in individuals of light complexion. ... between 290 and Photosensitivity occurs when a photon-absorbing chemical (chromophore) present in the skin absorbs incident energy, becomes excited, and transfers the absorbed...

Ngày tải lên: 07/07/2014, 01:20

... extent in the Chapter 057. Photosensitivity and Other Reactions to Light (Part 2) Molecular Targets for UVR-Induced Skin Effects Epidermal DNA, predominantly in keratinocytes and in Langerhans ... released into the circulation from the bone marrow and the liver and are transported to the skin, where they absorb incident energy both in the Soret band, around 400...

Ngày tải lên: 07/07/2014, 01:20

... Chapter 057. Photosensitivity and Other Reactions to Light (Part 5) Polymorphous Light Eruption After sunburn, the most common type of photosensitivity disease is polymorphous light eruption ... exposure. Phototoxicity and Photoallergy These photosensitivity disorders are related to the topical or systemic administration of drugs and other chemicals....

Ngày tải lên: 07/07/2014, 01:20

... persistent photosensitivity is known as chronic actinic dermatitis. These patients are typically elderly men with a long history of Chapter 057. Photosensitivity and Other Reactions to Light (Part ... energy, become photoexcited, generate ROS, and evoke cutaneous photosensitivity. The mechanism of porphyrin photosensitization is known to be photodynamic, or oxygen...

Ngày tải lên: 07/07/2014, 01:20

... Fig. 57-1. Figure 57-1 Chapter 057. Photosensitivity and Other Reactions to Light (Part 7) Porphyria cutanea tarda is the most common type of human porphyria and is associated with decreased ... include an acute photosensitivity characterized by subjective burning and stinging of exposed skin that often An algorithm for the diagnosis of a patient with photo...

Ngày tải lên: 07/07/2014, 01:20

... dioxide 25 Chapter 057. Photosensitivity and Other Reactions to Light (Part 8) Natural photoprotection is provided by structural proteins in the epidermis, particularly keratins and melanin. ... effects of long-term UV-B phototherapy and PUVA photochemotherapy mimic those seen in individuals with chronic sun exposure and include skin dryness, actinic keratoses,...

Ngày tải lên: 07/07/2014, 01:20

... including the face, the neck, and the hands. Major risk factors include male sex, childhood sun exposures, older age, fair skin, and residence at latitudes closer to the equator. Whites of darker complexions ... but this is likely due to failure to control for confounding factors such as sunscreen stability and frequency of application. Since no prospective studies are availab...

Ngày tải lên: 07/07/2014, 01:20

... Smokeless tobacco is the fastest growing part of the tobacco industry and represents a substantial health risk. Chewing tobacco is a carcinogen linked to Chapter 078. Prevention and Early Detection ... Cancer (Part 1) Harrison's Internal Medicine > Chapter 78. Prevention and Early Detection of Cancer Prevention and Early Detection of Cancer: Introduction I...

Ngày tải lên: 07/07/2014, 01:20

... 127. Treatment and Prophylaxis of Bacterial Infections (Part 1) Harrison's Internal Medicine > Chapter 127. Treatment and Prophylaxis of Bacterial Infections Treatment and Prophylaxis ... resistance; and (3) strategies that can be used by clinicians to limit resistance. In addition, patient-associated parameters, such as infection site, other drugs being ta...

Ngày tải lên: 08/07/2014, 02:20

... designations. Area 17 corresponds to the primary visual cortex, 41–42 to the primary auditory cortex, 1– 3 to the primary somatosensory cortex, and 4 to the primary motor cortex. The rest of the ... network for face and object recognition; a limbic network for retentive memory; and a prefrontal network for attention and behavior. The numbers refer to the Brodmann cyto...

Ngày tải lên: 06/07/2014, 13:20