poniedziałek, 23 stycznia 2017
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Chemia/Biochemia (836)

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EN_00972257_2377 STO
Illustration of molecules
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EN_00962647_4073 VAL
molecule
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EN_00962661_1698 VAL
molecule
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EN_00957730_3122 PHO
Illustration of beakers.
EN_00957730_3126 PHO
An illustration of a microscope.
EN_00957730_3127 PHO
An illustration of a microscope.
EN_90286235_0305 PHO
Cutaway view of a helium atom displaying 1s & 2s orbitals.
EN_90286235_0253 PHO
Sarin nerve gas. Computer artwork of a molecule of the nerve gas Sarin (methylphosphoneflouridic, (1- methyl ester), chemical formula (C4. H10. O2.P.F)). The atoms are shown as spheres and are colour- coded: carbon (blue), oxygen (red), hydrogen (white), phosphorus (yellow), fluorine (green). The bonds between them are shown as cylinders. Sarin (also known as GB) is used in chemical weapons. It is deadly and works in minutes. Skin contact or inhalation leads to disruption of the nervous system leading to convulsions, paralysis and death.
EN_90286236_0070 PHO
Protein molecule.
! EN_90272364_0010 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Periodic table, computer artwork with superimposed generic molecular structure. This table shows the chemical elements arranged in order of atomic number (the number of protons in the nucleus). Elements with similar chemistry occur in the same group (vertical column). Some groups are colour-coded: alkali metals (yellow, left, except H); alkaline-earth metals (purple with white text); transition metals (blue, centre); other metals (purple with yellow text, centre right); halogens (dark orange); inert gases (yellow, far right). The lanthanide and actinide series of elements (dark blue with white text) are shown in the lower two rows.
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! EN_90272364_0011 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Periodic table, computer artwork. This table shows the chemical elements arranged in order of atomic number (the number of protons in the nucleus). Elements with similar chemistry occur in the same group (vertical column). Some groups are colour-coded: alkali metals (yellow, left, except H); alkaline-earth metals (purple with white text); transition metals (blue, centre); other metals (purple with yellow text, centre right); halogens (dark orange); inert gases (yellow, far right). The lanthanide and actinide series of elements (dark blue with white text) are shown in the lower two rows.
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! EN_90272364_0012 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Periodic table, computer artwork. This table shows the chemical elements arranged in order of atomic number (the number of protons in the nucleus). Elements with similar chemistry occur in the same group (vertical column). Some groups are colour-coded: alkali metals (yellow, left, except H); alkaline-earth metals (purple with white text); transition metals (blue, centre); other metals (purple with yellow text, centre right); halogens (dark orange); inert gases (yellow, far right). The lanthanide and actinide series of elements (dark blue with white text) are shown in the lower two rows.
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! EN_90248314_0003 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Bisphenol A, molecular model. This chemical is used in the plastics industry as an antioxidant and as a component of epoxy resins and polycarbonate plastics. There are concerns that increasing levels of bisphenol A in the environment could be harmful. It is already known as a synthetic oestrogen that lowers sperm count in men and is also thought to disrupt foetal development. Atoms are represented as spheres are colour-coded: carbon (black), oxygen (red) and hydrogen (grey).
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! EN_90248314_0004 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Bisphenol A, molecular model. This chemical is used in the plastics industry as an antioxidant and as a component of epoxy resins and polycarbonate plastics. There are concerns that increasing levels of bisphenol A in the environment could be harmful. It is already known as a synthetic oestrogen that lowers sperm count in men and is also thought to disrupt foetal development. Atoms are represented as spheres are colour-coded: carbon (blue), oxygen (red) and hydrogen (yellow).
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! EN_90248314_0005 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Bisphenol A, molecular model. This chemical is used in the plastics industry as an antioxidant and as a component of epoxy resins and polycarbonate plastics. There are concerns that increasing levels of bisphenol A in the environment could be harmful. It is already known as a synthetic oestrogen that lowers sperm count in men and is also thought to disrupt foetal development. Atoms are represented as spheres are colour-coded: carbon (blue), oxygen (red) and hydrogen (yellow).
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! EN_90268567_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Miller-Urey experiment. Artwork of the apparatus used in the Miller-Urey experiment to study the origin of life. This 1950s experiment attempted to duplicate the conditions which would have existed on the primordial Earth. The apparatus contains a 'sea' of sterile water (bottom) and an 'atmosphere' of hydrogen, methane and ammonia (top right). Electrodes give off a spark (right) to imitate either lightning or ultra-violet radiation from the Sun. The result is a tar-like residue containing amino acids, the basic building blocks of life.
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! EN_90274300_0003 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prostacyclin molecule. Computer model showing the structure of the hormone prostacyclin, or prostaglandin I2 (PGI2). Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red). Prostacyclin acts to widen blood vessels (thus lowering blood pressure) and to prevent aggregation of platelets (preventing blood clotting). These effects are the opposite of those of the related hormone thromboxane, and the balance between the two is important in regulating the functioning of the circulatory system. When taken as a drug it is known as epoprostenol.
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! EN_90274300_0004 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prostacyclin molecule. Computer model showing the structure of the hormone prostacyclin, or prostaglandin I2 (PGI2). Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red). Prostacyclin acts to widen blood vessels (thus lowering blood pressure) and to prevent aggregation of platelets (preventing blood clotting). These effects are the opposite of those of the related hormone thromboxane, and the balance between the two is important in regulating the functioning of the circulatory system. When taken as a drug it is known as epoprostenol.
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! EN_90274302_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prostaglandin E1 molecule. Computer model showing the structure of the hormone prostaglandin E1 (PGE1). Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red). PGE1 acts to widen blood vessels (vasodilation), thus lowering blood pressure and improving blood flow. It is therefore used as a drug, known as Alprostadil, to treat erectile dysfunction.
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! EN_90274302_0002 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Prostaglandin E1 molecule. Computer model showing the structure of the hormone prostaglandin E1 (PGE1). Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red). PGE1 acts to widen blood vessels (vasodilation), thus lowering blood pressure and improving blood flow. It is therefore used as a drug, known as Alprostadil, to treat erectile dysfunction.
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