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A light-emitting diode ( LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.
- Light-emitting Diode Physics
Light-emitting diodes (LEDs) produce light (or infrared...
- Led Wallpaper
LED wallpaper. LED wallpaper is the integration of...
- Cat's-Whisker Detector
Crystal radios had no amplifying components to increase the...
- Seven-segment Display
A typical 7-segment LED display component, with decimal...
- Electroluminescence
Views of a liquid crystal display, both with...
- Phosphor
Example of phosphorescence Monochrome monitor Aperture...
- Lawyers' Edition
The United States Supreme Court Reports, Lawyers' Edition,...
- Erectile dysfunction
Erectile dysfunction (ED), also referred to as impotence, is...
- Light-emitting Diode Physics
The United States Supreme Court Reports, Lawyers' Edition, or Lawyers' Edition (L. Ed. and L. Ed. 2d in case citations), is an unofficial reporter of Supreme Court of the United States opinions. The Lawyers' Edition was established by the Lawyers Cooperative Publishing Company of Rochester, New York in 1882, and features coverage of Supreme ...
- Signs and Symptoms
- Causes
- Pathophysiology
- Diagnosis
- Treatment
- History
- Anthropology
- Lexicology
- Further Reading
ED is characterized by the persistent or recurring inability to achieve or maintain an erection of the penis with sufficient rigidity and duration for satisfactory sexual activity.It is defined as the "persistent or recurrent inability to achieve and maintain a penile erection of sufficient rigidity to permit satisfactory sexual activity for at lea...
Causes of or contributors to ED include the following: 1. Diets high in saturated fat are linked to heart diseases, and males with heart diseases are more likely to experience ED. By contrast, plant-based dietsshow a lower risk for ED. 2. Prescription drugs (e.g., SSRIs, beta blockers, antihistamines, alpha-2 adrenergic receptor agonists, thiazides...
Penile erection is managed by two mechanisms: the reflex erection, which is achieved by directly touching the penile shaft, and the psychogenic erection, which is achieved by erotic or emotional stimuli. The former involves the peripheral nerves and the lower parts of the spinal cord, whereas the latter involves the limbic system of the brain. In b...
In many cases, the diagnosis can be made based on the person's history of symptoms. In other cases, a physical examination and laboratory investigations are done to rule out more serious causes such as hypogonadism or prolactinoma. One of the first steps is to distinguish between physiological and psychological ED. Determining whether involuntary e...
Treatment depends on the underlying cause. In general, exercise, particularly of the aerobic type, is effective for preventing ED during midlife. Counseling can be used if the underlying cause is psychological, including how to lower stress or anxiety related to sex. Medications by mouth and vacuum erection devices are first-line treatments,: 20, 2...
Attempts to treat the symptoms described by ED date back well over 1,000 years. In the 8th century, males of Ancient Rome and Greece wore talismans of rooster and goat genitalia, believing these talismans would serve as an aphrodisiac and promote sexual function. In the 13th century, Albertus Magnus recommended ingesting roasted wolf penis as a rem...
Anthropological research presents ED not as a disorder but, as a normal, and sometimes even welcome sign of healthy aging. Wentzell's study of 250 Mexican males in their 50s and 60s found that "most simply did not see decreasing erectile function as a biological pathology". The males interviewed described the decrease in erectile function "as an ai...
The Latin term impotentia coeundi describes simple inability to insert the penis into the vagina; it is now mostly replaced by more precise terms, such as erectile dysfunction (ED). The study of ED within medicine is covered by andrology, a sub-field within urology. Research indicates that ED is common, and it is suggested that approximately 40% of...
Carson C, Faria G, Hellstrom WJ, Krishnamurti S, Minhas S, Moncada I, et al. (1 January 2010). "Implants, Mechanical Devices, and Vascular Surgery for Erectile Dysfunction". Journal of Sexual Medic...
- Inability to gain or maintain an erection
Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Light-emitting diodes (LEDs) produce light (or infrared radiation) by the recombination of electrons and electron holes in a semiconductor, a process called "electroluminescence". The wavelength of the light produced depends on the energy band gap of the semiconductors used.
In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.
An LED lamp or LED light [1] is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more energy-efficient than equivalent incandescent lamps and fluorescent lamps.
