poniedziałek, 23 października 2017
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EN_00957730_3353 PHO
An illustration of the key component of the nervous system, the neuron; human brain in the background. Neurons have a large number of extensions called dendrites; branches of the neuron cell body that can be long, or very short to act as chemical message receivers from other neurons. The main extension here is the axon, the purpose of which is to transmit electro-chemical signals from one neuron to another neuron. Long axons are covered by a myelin sheath, a fatty substance that covers the axon and insulates it. Shown here is the connection between one neuron (center) and a foreground neuron body. At the end of the axon ending, the bouton, a synapse with the dendrite of the foreground cell is taking place. Across this synapse, very small neurotransmitters (red) cross this gap into the next neuron, creating the nervous system message transferral system.
EN_00957730_3354 PHO
An illustration of the key component of the nervous system, the neuron; human brain in the background. Neurons have a large number of extensions called dendrites; branches of the neuron cell body that can be long, or very short to act as chemical message receivers from other neurons. The main extension here is the axon, the purpose of which is to transmit electro-chemical signals from one neuron to another neuron. Long axons are covered by a myelin sheath, a fatty substance that covers the axon and insulates it. Shown here is the connection between one neuron (center) and a foreground neuron body. At the end of the axon ending, the bouton, a synapse with the dendrite of the foreground cell is taking place. Across this synapse, very small neurotransmitters (red) cross this gap into the next neuron, creating the nervous system message transferral system.
EN_00957730_3575 PHO
Illustration showing pregnant patient with epidural in place for labor pain relief. Evidence of fever on patien'ts face.
EN_00957730_3655 PHO
Conceptual image of junk food passing through the arteries into the heart.
EN_00957730_3811 PHO
Conceptual illustration depicting the spread of disease throughout the world.
EN_00957730_3812 PHO
Conceptual illustration depicting the spread of disease throughout the world.
EN_00952097_0882 IKO
Zeros and ones in center of germ cell
EN_00935564_0039 BSI
Birth of love desire. Representation of what it happenning in the brain at the birth of love desire. Blue arrows : The hippocampus (memory area, in yellow) and the amygdala (centre of emotions, in purple) send information to the prefrontal cortex (centre of reasoning and decision-making, in green), that stimulates on its turn the hypothalamus (centre of corporal and hormonal reactions, in blue). The body is bombarded of hormones. Reactions : heart palpitations, red on the cheeks, legs trembling... Red arrows : stimulated by the secretion of dopamine (see level of secretion in the tube on the left of the illustration), the nucleus accumbens (pink area) stimulates the brain and the prefrontal cortex to push for action. Green arrow : The prefrontal cortex (centre of reasoning) moderates the action of the nucleus accumbens.
EN_00914102_0285 VU
A caduceus with capsules and pills with dollar signs -- concept of the high cost of prescription medication.
EN_00914102_4312 VU
Futuristic surgery; removing a growth from the fallopian tubes.
EN_90286236_0272 PHO
Conceptual image representing frequency. Sound byte on a grid moving through an ear.
EN_90286488_0004 PHO
Two cytotoxic T-cells attack a single cancer cell. T-cells are lymphocytes originating in the thymus. They come in a variety of types and play a role in the immune system.
EN_90286488_0003 PHO
Hepatitis C viruses floating in a microscopic space.
EN_90286490_0012 EN
An illustration based on an SEM of the aids virus (HIV) infecting T-Lymphocyte.
! EN_90064738_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration of the whole brain in the human head. This side view shows the extensive convolutions of the cerebrum (white); with the cerebellum below it, here coloured red. At the base of the brain is the brainstem, consisting of Cand medulla, which is a thickening of the spinal cord. In the neck the cervical vertebrae have been sectioned through (spongy brown); nerves of the spinal cord can be seen which pass to the face and neck.
! EN_90059703_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Appendicitis. Illustration of a human appendix, showing it red and inflamed in appendicitis. At lower right, the appendix appears as the narrow finger-shaped tube that branches off the first part of the large intestine (caecum, upper left). Inflammation of the appendix in appendicitis is a common cause of abdominal pain in children and young adults. Usually it is due to improperly digested food or a lump of faeces blocking the opening to the appendix. Symptoms include pain in the lower right-hand side of the abdomen, fever, loss of appetite and vomiting. Treatment of acute appendicitis is usually an appendic- ectomy, the surgical removal of the appendix.
! EN_90059127_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prostheses. Computer illustration of a man's body containing artificial implants (prostheses). The prostheses are (from top to bottom): skull plate, brain shunt (white tube) to drain excess cerebro- spinal fluid from the brain, cochlear implant to restore hearing, false eye, artificial jaw, artificial tooth, plastic trachea (windpipe), heart pacemaker (upper left), artificial aortic heart valve (white, above heart), arterial stent (to the right of the valve) to hold the artery open, pinned vertebral column and an inflatable penile implant. Numerous artificial joints are seen, along with a prosthetic lower leg.
! EN_90018146_0012 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Heart after heart attack. Gamma scanning used to assess a 74-year-old man's heart following a heart attack (myocardial infarction). 12 coloured gamma scans (upper left) show blood uptake by the heart muscle, ranging from adequate (red) to inadequate (blue). A graph (upper right) shows the ejection fraction (EF) of the heart (the amount of blood it is pumping) to be an adequate 55%. The four models along bottom (based on gamma scanning) show four different parameters of heart function. Ischaemia (reduced blood flow) has been diagnosed for some areas of this heart. Radioactive tracers were used to label the blood and track its uptake by heart muscle by detecting its emissions of gamma rays.
! EN_90018105_0004 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Abstract of the human head representing neurological disorders such as Alzheimer's, Parkinson's disease and dementia.
EN_90085757_0226 BSI
PHOTO: EAST NEWS/BSIP Recherche d'un vaccin contre le sida. Repr??sentation d'une des recherches pour un vaccin contre le sida. Ce vaccin ?. ADN protA?ge les souris contre le virus. Le principe consiste ?. injecter dans un macrophage de souris des boucles d'ADN contenant les informations pour fabriquer des morceaux de virus (exemple : le harpon lui permettant de se fixer ?. la cellule h??te). Ces morceaux de virus sont pr??sent??s aux lymphocytes T CD4. Activ??s, ces lymphocytes d??clenchent la r??action immunitaire afin d'obtenir des lymphocytes T CD8 m??moires et des quelques anticorps sp??cifiques permettant de d??truire les morceaux de virus s??lectionn??s dans la boucle d'ADN. Research into an AIDS vaccine. Illustration of one type of research into an AIDS vaccine. This DNA vaccine protects mice from the virus. The method: DNA strands containing the information for producing fragments of the virus (ex. the harpoon enabling it to latch on to a host cell) are injected into a mouse microphage. These virus segments are presented to the T CD4 lymphocytes which, activated, trigger an immune response which produces memory T CD8 lymphocytes and a few specific antibodies making it possible to destroy the selected virus segments in the DNA strands.

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