in 1993 metcalf proposed the hypothesis many factors are needed for regulation of the hematopoietic stem cell hsc compartment. in other words can deletion of a single hsc generegulator be sufficient to cause any abnormal phenotype or cancer or should multiple gene mutations occur
from many scientific reports we know that deletion of just one gene could lead to hsc cellcycle dys...... [Show More]
in the heart of bolivia an amazonian society is losing its traditional knowledge of the medicinal value of local plants to the detriment of its childrens health. the tsimane are a small seven thousandstrong population living in a lowland region of bolivia who possess tremendous knowledge about the plants they share their forest with.
their botanical knowhow trickles down thr...... [Show More]
most of the planets ecosystems are made of a multitude of different species rich tangles of living things all interacting competing and cooperating in order to eke out an existence. but not always in south africa within the darkness of a gold mine there is an ecosystem that consists of a single species a type of bacteria that is the only thing alive in the hot oxygenless depths. it...... [Show More]
we will readily describe a persons demeanour as warm or cold but this link between temperature and personality is more than just a metaphorical one. a new study shows that warming a persons fingertips can also bring out the warmth in their social relationships pushing them to judge others more positively and promoting their charitable side.
lawrence will...... [Show More]
animals often show a keen intelligence and many species from octopuses to crows can perform problemsolving tasks. but humans are thought to go one step further. we can reflect on our own thoughts and we have knowledge about our knowledge. we can not only solve problems but we know in advance if we can or are likely to.
in technical terms this ability is known as metac...... [Show More]
in the ivory coast a small stream called audrenisrou winds its way through the lowland rainforest of the tai national park . on the floodplain of this stream at a site called nuolo lie several stones that seem unassuming at first glance. but to the trained eye they are a window to the past.
their shape is different to other stones that have been worn away by natural erosion. they have b...... [Show More]
i have only ever seen one car crash and i remember it with crystal clarity. i was driving home along a motorway and a car heading the opposite way simply veered into the central reservation. its hood crumpled like so much paper its back end lifted clear off the tarmac and it spun 180 degrees before crashing back down in a cloud of dust. all of this happened within the space of a second so the de..... [Show More]
many animals use poisonous secretions to protect themselves from predators. but poisons are complex chemicals and can take a lot of energy to make. why invest in them when you can steal someone elses
poison thieves are wellknown in the animal kingdom. many species of brightly coloured poison arrow frogs acquire their poisons from beetles while some sea slugs make a living by hu...... [Show More]
its midoctober. for most of us our new years resolutions have long been forgotten and our bad habits remain frustratingly habitual. the things that are bad for us often feel strongly compelling be they highfat foods gambling or alcohol. and nowhere is the problem of addiction more widespread serious and dangerous than the case of cigarette smoking.
smoking is the leadi...... [Show More]
while philosophers and poets muse on the meaning of life natural selection casts a dispassionate eye on the whole affair. from the viewpoint of evolution there is only one thing that matters that we survive long enough to pass our genes on to the next generation as many times as possible. and from the viewpoint of evolution we are not doing a very good job.
birth rates in several count...... [Show More]
the twentyfirst century is having a troubled infancy. eight years in and it is facing the twin perils of climate change and a looming energy crisis. solutions to both are in high demand and many research dollars and pounds are being channelled into developing environmen tallyfrie ndly renewable resources.
biofuels the product of living things certainly fit the bill being both renewabl...... [Show More]
throughout the day our skins are constantly sending out messages that we are completely oblivious to. the message is written in chemical form and it says here i am. come and get me. we neither see nor hear these signals but other creatures do and they slither crawl and swim our way in response.
these creatures are nematodes a group of worms that are some of the most common ...... [Show More]
it is the instinct of every mother to protect their children as they grow up shielding them from the dangers of the outside world. right from birth life can be a difficult experience. within a few hours the child is sent from a safe warm constantly nourished cocoon into a bright noisy and threatening world. this stressful transition poses a serious threat to the newborns vulnerable an...... [Show More]
worst. paper. ever. Post Source: feeds.feedburner.com Posted: Oct 06 2008 14:43:04
yesterday we looked at how real science works today in a repost from my old blog we look at some really bad science. palmd
ive been meaning to touch on morgellons disease a form of delusional parasitosis for a while but havent figured out how to approach it. thankfully others have . in the first referenced discussion a paper was cited . ...... [Show More]
sniffing brings molecules in the air around us into our nose where they are detected and manifested in our brains as smells. but try the same trick underwater and you would rapidly choke or drown. nonetheless smell is a tremendously important sense for most mammals and at least two species have found a way to safely sniff in water.
the starnosed mole condylura cristata is o...... [Show More]
you are not the person you used to be. two weeks ago the surface of your skin was covered with a completely different set of cells which have since died and flaked off. four month ago you had a wholly different set of red blood cells. since birth your body has grown tremendously in size and much of it is constantly regenerating replacing old cells with new ones.
but your brain is dif...... [Show More]
the world is currently home to 6.5 billion people and over the next 50 years this number is set to grow by 50. with this massive planetary overcrowding band aids plea to feed the world seems increasingly unlikely. current food crops seem unequal to the task but scientists at texas university may have developed a solution a secret ace up our sleeves cotton.
cotton is famed ...... [Show More]
i am walking strangely. about a week ago i pulled something to my left ankle which now hurts during the part of each step just before the foot leaves the ground. as a result my other muscles are compensating for this to minimise the pain and my gait has shifted to something subtly different from the norm. in similar ways all animal brains can compensate for injuries by computing new ways of mo...... [Show More]
you are on a date and by all accounts its going well. midway through dinner you excuse yourself and head to the bathroom where to your chagrin the mirror reveals that you have a streak of sauce on the side of your face. embarrassed you wipe it away and rejoin your date.
its a fairly innocuous scene but it requires an ability that only the most intelligent of animals possess...... [Show More]
in medieval times crusading christian knights cut a swathe through the middle east in an attempt to reclaim jerusalem from the muslims. the muslims in turn cut through the invaders using a very special type of sword which quickly gained a mythical reputation among the europeans. these damascus blades were extraordinarily strong but still flexible enough to bend from hilt to tip....... [Show More]
but apparently hed rather have me fill it with coffee. really...i mean it. i love coffee but cmon now i cant stand that this idiot is given time on public television during pledge drives to peddle his woo ......... [Show More]
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