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Denham Harman
Denham Harman (February 14, 1916 – November 25, 2014) was an American medical academic who latterly served as professor emeritus at the University of Nebraska Medical Center. Harman is known as the "father of the free radical theory of aging". Background Born in San Francisco, he earned his BS and Ph.D. in 1943 from the College of Chemistry at the University of California, Berkeley and his M.D. from Stanford University, finishing his internship in 1954. Immediately after earning his Ph.D., in 1943, Harman joined the reaction kinetics department of Shell Oil in Emeryville, California. He worked for six years as a Shell research chemist, in part studying free radical reactions in petroleum products. During that period he was granted 35 patents, one for a compound used in plastic strips to kill flies ("Shell No Pest Strip"). Harman became fascinated with the phenomenon of aging, its cause and possible cure. To assist him in understanding this problem, he went to medical school ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Francisco, California
San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of , at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include ''SF'', ''San Fran'', ''The '', ''Frisco'', and ''Baghdad by the Bay''. San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radical (chemistry)
In chemistry, a radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes. A notable example of a radical is the hydroxyl radical (HO·), a molecule that has one unpaired electron on the oxygen atom. Two other examples are triplet oxygen and triplet carbene (꞉) which have two unpaired electrons. Radicals may be generated in a number of ways, but typical methods involve redox reactions. Ionizing radiation, heat, electrical discharges, and electrolysis are known to produce radicals. Radicals are intermediates in many chemical reactions, more so than is apparent from the balanced equations. Radicals are important in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes. A majority of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Residency (medicine)
Residency or postgraduate training is specifically a stage of graduate medical education. It refers to a qualified physician (one who holds the degree of MD, DO, MBBS, MBChB), veterinarian ( DVM or VMD) , dentist ( DDS or DMD) or podiatrist ( DPM) who practices medicine, veterinary medicine , dentistry, or podiatry, respectively, usually in a hospital or clinic, under the direct or indirect supervision of a senior medical clinician registered in that specialty such as an attending physician or consultant. In many jurisdictions, successful completion of such training is a requirement in order to obtain an unrestricted license to practice medicine, and in particular a license to practice a chosen specialty. In the meantime they practice "on" the license of their supervising physician. An individual engaged in such training may be referred to as a resident, registrar or trainee depending on the jurisdiction. Residency training may be followed by fellowship or sub-specialty trai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medical Intern
A medical intern is a physician in training who has completed medical school and has a medical degree but does not yet have a license to practice medicine unsupervised. Medical education generally ends with a period of practical training similar to internship, but the way the overall program of academic and practical medical training is structured differs depending upon the country, as does the terminology used (see medical education and medical school for further details). Australia In Australia, medical graduates must complete one year in an accredited hospital post before they receive full registration. This year of conditional registration is called the intern year. An internship is not necessarily completed in a hospital at the same state as the graduate's medical school. Brazil In Brazil, medical school consists of six years or twelve semesters. The final two years (or one and a half years, depending on the University in question) are the internship. During this time, stude ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fox News
The Fox News Channel, abbreviated FNC, commonly known as Fox News, and stylized in all caps, is an American multinational conservative cable news television channel based in New York City. It is owned by Fox News Media, which itself is owned by the Fox Corporation. The channel broadcasts primarily from studios at 1211 Avenue of the Americas in Midtown Manhattan. Fox News provides service to 86 countries and overseas territories worldwide, with international broadcasts featuring Fox Extra segments during ad breaks. The channel was created by Australian-American media mogul Rupert Murdoch in 1996 to appeal to a conservative audience, hiring former Republican media consultant and CNBC executive Roger Ailes as its founding CEO. It launched on October 7, 1996, to 17 million cable subscribers. Fox News grew during the late 1990s and 2000s to become the dominant United States cable news subscription network. , approximately 87,118,000 U.S. households (90.8% of television subscr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcoholic Beverage
An alcoholic beverage (also called an alcoholic drink, adult beverage, or a drink) is a drink that contains ethanol, a type of alcohol that acts as a drug and is produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcoholic drinks, often referred to as "drinking", plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages. Regulations may require the labeling of the percentage alcohol content (as ABV or proof) and the use of a warning label. Some countries ban such activities entirely, but alcoholic drinks are legal in most parts of the world. The global alcoholic drink industry exceeded $1 trillion in 2018. Alcohol is a depressant, which in low doses causes euphoria, reduces anxiety, and increases sociability. In higher doses, it causes drunkenness, stupor, unconsciousness, or death. Long-term use can lead to an alcohol use disorder, an incre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tobacco Smoking
Tobacco smoking is the practice of burning tobacco and ingesting the resulting smoke. The smoke may be inhaled, as is done with cigarettes, or simply released from the mouth, as is generally done with pipes and cigars. The practice is believed to have begun as early as 5000–3000 BC in Mesoamerica and South America. Tobacco was introduced to Eurasia in the late 17th century by European colonists, where it followed common trade routes. The practice encountered criticism from its first import into the Western world onwards but embedded itself in certain strata of a number of societies before becoming widespread upon the introduction of automated cigarette-rolling apparatus. Smoking is the most common method of consuming tobacco, and tobacco is the most common substance smoked. The agricultural product is often mixed with additives and then combusted. The resulting smoke is then inhaled and the active substances absorbed through the alveoli in the lungs or the oral mucosa. Many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lifestyle (sociology)
Lifestyle is the interests, opinions, behaviours, and behavioural orientations of an individual, group, or culture. The term was introduced by Austrian psychologist Alfred Adler in his 1929 book, ''The Case of Miss R.'', with the meaning of "a person's basic character as established early in childhood". The broader sense of lifestyle as a "way or style of living" has been documented since 1961. Lifestyle is a combination of determining intangible or tangible factors. Tangible factors relate specifically to demographic variables, i.e. an individual's demographic profile, whereas intangible factors concern the psychological aspects of an individual such as personal values, preferences, and outlooks. A rural environment has different lifestyles compared to an urban metropolis. Location is important even within an urban scope. The nature of the neighborhood in which a person resides affects the set of lifestyles available to that person due to differences between various neighborhoods ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fraternities And Sororities
Fraternities and sororities are social organizations at colleges and universities in North America. Generally, membership in a fraternity or sorority is obtained as an undergraduate student, but continues thereafter for life. Some accept graduate students as well. Individual fraternities and sororities vary in organization and purpose, but most share five common elements: # Secrecy # Single-sex membership # Selection of new members on the basis of a two-part vetting and probationary process known as '' rushing'' and ''pledging'' # Ownership and occupancy of a residential property where undergraduate members live # A set of complex identification symbols that may include Greek letters, armorial achievements, ciphers, badges, grips, hand signs, passwords, flowers, and colors Fraternities and sororities engage in philanthropic activities, host parties, provide "finishing" training for new members such as instruction on etiquette, dress and manners, and create networking opport ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journalism
Journalism is the production and distribution of reports on the interaction of events, facts, ideas, and people that are the "news of the day" and that informs society to at least some degree. The word, a noun, applies to the occupation (professional or not), the methods of gathering information, and the organizing literary styles. Journalistic media include print, television, radio, Internet, and, in the past, newsreels. The appropriate role for journalism varies from countries to country, as do perceptions of the profession, and the resulting status. In some nations, the news media are controlled by government and are not independent. In others, news media are independent of the government and operate as private industry. In addition, countries may have differing implementations of laws handling the freedom of speech, freedom of the press as well as slander and libel cases. The proliferation of the Internet and smartphones has brought significant changes to the media la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cardiovascular Disease
Cardiovascular disease (CVD) is a class of diseases that involve the heart or blood vessels. CVD includes coronary artery diseases (CAD) such as angina and myocardial infarction (commonly known as a heart attack). Other CVDs include stroke, heart failure, hypertensive heart disease, rheumatic heart disease, cardiomyopathy, abnormal heart rhythms, congenital heart disease, valvular heart disease, carditis, aortic aneurysms, peripheral artery disease, thromboembolic disease, and venous thrombosis. The underlying mechanisms vary depending on the disease. It is estimated that dietary risk factors are associated with 53% of CVD deaths. Coronary artery disease, stroke, and peripheral artery disease involve atherosclerosis. This may be caused by high blood pressure, smoking, diabetes mellitus, lack of exercise, obesity, high blood cholesterol, poor diet, excessive alcohol consumption, and poor sleep, among other things. High blood pressure is estimated to account for approximat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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