poniedziałek, 11 grudnia 2017
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! EN_90227077_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration of a human sperm fertilising an egg. The picture shows the size difference between the egg, or ovum, & the spermatozoon. Human spermatozoa are extremely elongated single cells about 65 micrometres long, divided into 3 main regions: a head, neck, & tail. The head, which contains the male nucleus, is about 7 micrometres long. Here, the head appears buried in the follicular cells, which form the corona radiata that surrounds the ovum. Beneath the corona radiata is a glycoprotein membrane, the zona pellucida, which the sperm must penetrate to reach the female nucleus.
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! EN_90185231_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Molecular computer graphics representation of the DNA (deoxyribonucleic acid) molecule, the genetic material of most living organisms. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base- pairing via hydrogen bonding and coiled into a helix. A nucleotide consists of 3 sub-units: a deoxyribose sugar, a phosphate group & one of four different bases; adenine, thymine, cytosine, & guanine. The genetic information is determined by the arrangement of base pairs along the molecule. Left side of stereo pair; see G110/067 for right side.
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! EN_90185323_0006 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Molecular computer graphics representation of the DNA (deoxyribonucleic acid) molecule, the genetic material of most living organisms. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base-pairing via hydrogen bonding and coiled into a helix. A nucleotide consists of 3 sub-units: a deoxyribose sugar, a phosphate group & one of four different bases; adenine, thymine, cytosine, & guanine. The genetic information is determined by the arrangement of base pairs along the molecule. Left side of stereo pair; see G110/065 for right side of pair.
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! EN_90185323_0005 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Molecular computer graphics representation of the DNA (deoxyribonucleic acid) molecule, the genetic material of most living organisms. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base- pairing via hydrogen bonding and coiled into a helix. A nucleotide consists of 3 sub-units: a deoxyribose sugar, a phosphate group & one of four different bases; adenine, thymine, cytosine, & guanine. The former two pair only with each other as do the latter. The genetic information is determined by the arrangement of these pairs along the molecule.
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! EN_90185323_0002 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer molecular graphics showing the structure of the DNA (deoxyribonucleic acid) molecule, the material of inheritance. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base- pairing and coiled into a helix. A nucleotide contains the sugar deoxyribose & one of four different bases thymine, adenine, cytosine, & guanine. The former two pair only with each other as do the latter. The genetic information is determined by the arrangement of these pairs along the molecule.
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! EN_90185323_0003 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer molecular graphics showing the structure of the DNA (deoxyribonucleic acid) molecule, the material of inheritance. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base- pairing and coiled into a helix. A nucleotide contains the sugar deoxyribose & one of four different bases thymine, adenine, cytosine, & guanine. The former two pair only with each other as do the latter. The genetic information is determined by the arrangement of these pairs along the molecule.
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! EN_90185323_0004 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Computer molecular graphics showing the structure of the DNA (deoxyribonucleic acid) molecule, the material of inheritance. DNA consists of a large number of nucleotides joined together in single file to form a strand. Two strands are linked together by base- pairing and coiled into a helix. A nucleotide contains the sugar deoxyribose & one of four different bases thymine, adenine, cytosine, & guanine. The former two pair only with each other as do the latter. The genetic information is determined by the arrangement of these pairs along the molecule.
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! EN_90186068_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Molecular computer graphics representation of the DNA (deoxyribonucleic acid) molecule, showing its double helix structure. DNA is comprised of two strands of nucleotides linked together in single file. The two stands are knitted together by base- pairing across adjacent nucleotides and coiled into a helix. A nucleotide contains the sugar deoxyribose & one of four organic baes: thymine, adenine, cytosine, & guanine. The former two pair only with each other as do the latter. The genetic information is determined by the arrangement of these pairs along the molecule.
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! EN_90185323_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY DNA. Computer graphic of part of the molecule of DNA (Deoxyribonucleic Acid), showing its twisted double helix structure. DNA is the carrier of the genetic code. Its structure was discovered in 1953 by James Watson and Francis Crick, who recog- nised its helical form from X-ray crystallography data. Here, spherical atoms in the molecule are colour-coded: phosphate (yellow); oxygen (orange); carbon (pink); nitrogen (blue). The double helix of DNA contains complementary pairs of organic bases at its core: adenine and thymine; cytosine and guanine. It is the sequence of these bases which form the genetic codes of inheritance.
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