piątek, 20 października 2017
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Chemia/Biochemia (847)

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! EN_90263541_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics representation of the structures of four different hydrocarbon molecules found in diesel fuel. Modelled using Chemical Design's Chem-X software.
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! EN_90259568_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics representation of a molecule of fructose (also called laevulose or fruit sugar), a simple sugar isomeric with glucose. Saccharides or sugars are comprised of rings of 4 or 5 carbon atoms (green) and one oxygen atom (red). Attached around the ring are hydroxy (OH) groups. Glucose & fructose are monosaccharides - single rings. Sucrose (cane sugar) consists of two rings joined together. Polysaccharides such as starch and cellulose consist of hundreds of glucose rings joined in a chain. Cellulose, the structural material of plants, is one of the most abundant naturally-occurring polymers. The image was modelled using Chemical Design's Chem-X software.
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! EN_90219246_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics space-filling representation of the haem group of the protein haemoglobin, the oxygen- and carbon dioxide-transporting pigment in blood. The site of interraction between oxygen or carbon dioxide and haemoglobin is an atom of iron (the central purple sphere), held in the centre of a perfectly flat porphyrin ring. The flat shape of the porphyrin allows oxygen and carbon dioxide access to the central iron atom to bind, be carried and ultimately be released without undergoing any chemical change. Image modelled using Chemical Design's Chem-X software.
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! EN_90219242_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics model of the protein haemoglobin, the oxygen-transporting pigment in blood. The site of interraction between oxygen and haemoglobin is an atom of Iron (Fe++ - yellow ball), which is held in the centre of a haem ring (represented by the green balls). The protein environment and the geometry of atoms surrounding the Iron atom permits oxygen to be bound, carried and ultimately given up without having been oxidised or otherwise changed chemically. The image was produced using Chemical Design's Chem-X software.
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! EN_90271224_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics image of an organometallic gold cluster compound, modelled using Chemical Design's Chem-X software.
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! EN_90227127_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphic image of the molecular structure of Immunoglobin G (IgG) with the notational name 'DOB'. Immunoglobins are a group of structurally related proteins that act as antibodies. Antibodies are special blood proteins. They are synthesised in lymphoid tissue in response to the presence of a particular antigen (foreign material) & circulated in the blood plasma to the troubled site. A huge range of antibodies are produced each with some slight structural difference. All immunoglobins contain a binding site, which fits, binds & inactivates foreign materials entering the body.
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! EN_90256829_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer graphics of the enzyme-substrate complex of serine proteases, one of the enzymes used in the digestion of proteins in human food.
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