Some features of the human circadian (24-hour) biological clock A circadian rhythm ( pron.: / s ɜr ˈ k eɪ d i ə n / ) is any biological process that displays an endogenous , entrainable oscillation of about 24 hours. These rhythms are driven by a circadian clock , and rhythms have been widely observed in plants , animals , fungi and cyanobacteria . The term circadian comes from the Latin circa , meaning "around" (or "approximately"), and diem or dies , meaning "day". The formal study of biological temporal rhythms, such as daily, tidal , weekly, seasonal, and annual rhythms, is called chronobiology . Although circadian rhythms are endogenous ("built-in", self-sustained), they are adjusted (entrained) to the local environment by external cues called zeitgebers , commonly the most important of which is daylight .
From the tiniest veins, arteries and nerves to serial cross-sections of the spinal cord, these incredibly detailed dissections show and label most every part of the human body. The collection is the product of a 17-year collaboration between David L. Bassett, a School of Medicine alumnus and faculty member known for his elegant dissections and love for the human body, and William Gruber, the photographer who invented the View-Master stereoscopic viewing device. The partnership between the two resulted in the production of the Stereoscopic Atlas of Human Anatomy, which began in 1948, but was not not completed until 1962. It consisted of 221 View-Master reels with 1,554 color stereo views of dissections of every body region. Each stereo view was accompanied by a black-and-white, labeled drawing and explanatory text.
Columbia University College of Physicians & Surgeons Dept of Anatomy and Cell Biology Clinical Anatomy Course New Media Resources
When Worlds Collide: Micro Versus Macro Although humans have long observed the devastating effects of infectious diseases, the microscope made it possible to see the pathogens. Today, the genomics revolution lets scientists "see" the microbial world in greater detail, leading to custom-designed drugs and therapies.
Deutsch: Gesundheits- und Fitnessrechner Here you can calculate the following informations on health and fitness topics: BMI | Ideal weight | Calorie consumption | Liquid consumption | Walking Index | Nutrition values | Vitamin table | Basic conversion | Body fat (adipose) rate | Optimal training pulse and heart rate | Protein requirement | Fat requirement | Nutrition value need | WHR - Waist to hip ratio | Drink reminder Vitamins Here you can find a detailed table of the most important vitamins .
First thing you need to know: Before doing anything else, you should simply click “play” and start watching the video above. It doesn’t take long for Robert Sapolsky , one of Stanford’s finest teachers, to pull you right into his course. Better to watch him than listen to me. Second thing to know: Sapolsky is a MacArthur Fellow, a world renowned neurobiologist, and an adept science writer best known for his book, Why Zebras Don’t Get Ulcers . Much of his research focuses on the interplay between the mind and body (how biology affects the mind, and the mind, the body), and that relationship lies at the heart of this course called “Human Behavioral Biology.” Now the third: Human Behavioral Biology is available on YouTube and iTunes for free.