Another actively working photographer, Sally Mann is just in the middle of her career. She was named America’s Best Photographer by Time magazine in 2001 for her stunning work of her family, as well as southern landscapes and her series of decomposing bodies. Her work has pushed buttons, from nude photographs of her children to rotting corpses, and she likes it that way. Students can study her work to see how it’s possible to keep a consistent style and vision, even when working with subjects that are completely unlike one another.
Don’t you just think that skin amongst is other things is just amazing, you cut yourself and a blood clot is formed (scab) and then within a matter of weeks new skin is grown over the wound as if it wasn’t even there in the first place! This is due to stem cells and other factors but stem cells play a major part in tissue repair and growth. Imagine in years to come if humans were to advance in this field and it was possible to regrow a finger that was amputated or a limb. I am more than curious about this subject and hopefully after reading this post you will be too.
The following is taken from http://stemcells.nih.gov/info/basics/basics1.asp
Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition, in many tissues they serve as a sort of internal repair system, dividing essentially without limit to replenish other cells as long as the person or animal is still alive. When a stem cell divides, each new cell has the potential either to remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell, a red blood cell, or a brain cell.
Stem cells are distinguished from other cell types by two important characteristics. First, they are unspecialized cells capable of renewing themselves through cell division, sometimes after long periods of inactivity. Second, under certain physiologic or experimental conditions, they can be induced to become tissue- or organ-specific cells with special functions. In some organs, such as the gut and bone marrow, stem cells regularly divide to repair and replace worn out or damaged tissues. In other organs, however, such as the pancreas and the heart, stem cells only divide under special conditions.
Until recently, scientists primarily worked with two kinds of stem cells from animals and humans: embryonic stem cells and non-embryonic “somatic” or “adult” stem cells. The functions and characteristics of these cells will be explained in this document. Scientists discovered ways to derive embryonic stem cells from early mouse embryos nearly 30 years ago, in 1981. The detailed study of the biology of mouse stem cells led to the discovery, in 1998, of a method to derive stem cells from human embryos and grow the cells in the laboratory. These cells are called human embryonic stem cells. The embryos used in these studies were created for reproductive purposes through in vitro fertilization procedures. When they were no longer needed for that purpose, they were donated for research with the informed consent of the donor. In 2006, researchers made another breakthrough by identifying conditions that would allow some specialized adult cells to be “reprogrammed” genetically to assume a stem cell-like state. This new type of stem cell, called induced pluripotent stem cells (iPSCs), will be discussed in a later section of this document.
Stem cells are important for living organisms for many reasons. In the 3- to 5-day-old embryo, called a blastocyst, the inner cells give rise to the entire body of the organism, including all of the many specialized cell types and organs such as the heart, lung, skin, sperm, eggs and other tissues. In some adult tissues, such as bone marrow, muscle, and brain, discrete populations of adult stem cells generate replacements for cells that are lost through normal wear and tear, injury, or disease.
Given their unique regenerative abilities, stem cells offer new potentials for treating diseases such as diabetes, and heart disease. However, much work remains to be done in the laboratory and the clinic to understand how to use these cells for cell-based therapies to treat disease, which is also referred to as regenerative or reparative medicine.
Laboratory studies of stem cells enable scientists to learn about the cells’ essential properties and what makes them different from specialized cell types. Scientists are already using stem cells in the laboratory to screen new drugs and to develop model systems to study normal growth and identify the causes of birth defects.
Research on stem cells continues to advance knowledge about how an organism develops from a single cell and how healthy cells replace damaged cells in adult organisms. Stem cell research is one of the most fascinating areas of contemporary biology, but, as with many expanding fields of scientific inquiry, research on stem cells raises scientific questions as rapidly as it generates new discoveries.
You know when someone says to you a certain famliar name or place and you can see an image forming in your mind, or when you travel somewhere or do something and when you think about it you have no recollection of going there or doing it (spontaneous amnesia), have you ever wondered why it is that happens or how it works that you can visualize an image in your head. The human mind is a fascinating thing in itself and according to some theorists we only use on average 5% of its full strength. There has been debate that some people are able to focus more than others and therefore become pychics or mediums etc. I find this absolutely amazing. Imagine if we all had 100% use of our mind. Imagine the things possible to us and the doors it could open. Hopefully this post will encourage you to become interested and curious too.
- How can we only use a percent of our brain?
- Evidence shows we can use more.
- Scientists and others in the psychological, sociological fields have asserted that humans use maybe .01 to.10 percent of our brain. Without getting all science geek about it there is an easier way of understanding what that means.
- First let us clarify, mechanically you use 100% of your brain. Maximizing usage is another subject. So when someone puts a percentage of use on the brain they do not mean that the other say 90% is dormant or useless.
- Think of it this way. Let’s say your brain is a stereo. When you are using your stereo you are using 100% of it. Here is the x factor. If the volume knob is set at say a 2 level then you are not getting the same usage when compared to turning the volume knob to 8 or 10.
- So what scientists are trying to get across to us is we have a lot more room in our cranium to fill. We have more volume to boost. We are not even close to tapping our potential of brain power. The percentage is actually a moot point I would think in reality.
- There is no physical data to determine in tangible evidence the amount of usage the human brain has. There are as many as if not more than 100 billion brain cells. Then there is the neuronal and synaptic connections. Interestingly there has been data that has determined that people have increased there brain power however.
- Then there are the people who demonstrate mental abilities that are very rare. Some people with autism for example have had the ability to calculate very high levels of math equations without ever having learned how.
- There is also more and more variables we are learning about the brain. Studies that suggest that even though our brain is one as a whole we evidently get production out of separate parts of the brain for different mental tasks. We have all heard of the right brain/left brain references for example.
- So regardless of how you want to interpret the brain usage by percentage, the fact is it is the most amazing gift we have. A computer is nothing compared to the human brain. And we can build upon our ability to get more out of it. So turn up the volume button and get the old noggin’ working.
- Taken fromhttp://scienceray.com/biology/human-biology/how-much-brain-do-we-use/