czwartek, 24 stycznia 2019
zamknij [x]
do:

Chemia/Biochemia (899)

12
456... z 45

Zdjęcia

! EN_01309402_0447 SPL
Zinc chemical element, computer illustration.
Model Released SPECIAL RATES FOR EDITORIAL AND BOOKS RF RATES FOR OTHER USE
! EN_01178034_0001 SCI
PLGA biomedical device, coloured scanning electron micrograph (SEM). PLGA, or poly(lactic-co-glycolic acid), is a copolymer used in a variety of biomedical devices such as grafts, sutures (stitches), implants, prosthetic devices, and micro and nanoparticles for drug delivery. PLGA is particularly well suited to these uses as a result of its biodegradability and bio-compatibility - It breaks down in the body to produce lactic acid and glycolic acid, both of which occur naturally in the body. One PLGA drug delivery device is currently used for the treatment of prostate cancer.
! EN_01178034_0002 SCI
Antimicrobial wound dressing. Coloured scanning electron micrograph (SEM) of fibres (diagonal) from an Aquacel Ag wound dressing. The fibres of this dressing are made from sodium carboxymethylcellulose (NaCMC) that contain 1.2 percent silver (coloured dots) in an ionic form. In the presence of sodium ions secreted from a wound, the silver ions are released and exert a sustained antimicrobial effect against a wide range of organisms including MRSA (methicillin-resistant ^IStaphylococcus aureus^i). This protects the wound and helps aid healing.
! EN_01178034_0006 SCI
Microsphere filter particles. Scanning electron micrograph (SEM) of cinchonidine-imprinted polymer microspheres. Cinchonidine is a poisonous alkaloid used in organic chemistry. These microscopic spheres have been chemically treated to bind to cinchonidine as a means of removing it from drinking water. Magnification: x2300 when printed 10 centimetres wide.
! EN_01178034_0007 SCI
Microsphere filter particles. Scanning electron micrograph (SEM) of cinchonidine-imprinted polymer microspheres. Cinchonidine is a poisonous alkaloid used in organic chemistry. These microscopic spheres have been chemically treated to bind to cinchonidine as a means of removing it from drinking water. Magnification: x9300 when printed 10 centimetres wide.
! EN_01178034_0008 SCI
Microsphere filter. Scanning electron micrograph (SEM) of chemically imprinted polymer microspheres in a fibre mesh. These microscopic spheres have been chemically treated to bind to certain chemicals as a means of removing them from drinking water. The spheres have been bound to the fibres to form a fibre mat so they can be used as a filter. Magnification: x1,700 when printed 10 centimetres wide.
! EN_01178034_0009 SCI
Facial scrub particles, SEM. Coloured scanning electron micrograph (SEM) of particles found within consumer facial scrub lotion. The large flakes are silica particles and the smaller spheres are tiny polyethylene 'microplastic' beads. The particles measuring only a few micrometres in diameter each act as exfoliating agents that help to remove dead skin cells when applied to the body. Microplastics are too small to be trapped during waste water treatment and eventually end up as in the ocean. It is thought that small marine animals ingest the microplastics and pass the pollutant up the food chain.
! EN_01178034_0010 SCI
PLGA microspheres, coloured scanning electron micrograph (SEM). PLGA, or poly(lactic-co-glycolic acid), is a copolymer used in a variety of biomedical devices such as grafts, sutures (stitches), implants, prosthetic devices, and micro and nanoparticles for drug delivery. PLGA is particularly well suited to these uses as a result of its biodegradability and bio-compatibility - It breaks down in the body to produce lactic acid and glycolic acid, both of which occur naturally in the body. One PLGA drug delivery device is currently used for the treatment of prostate cancer. Magnification: x2350, when printed 10 centimetres wide.
! EN_01178034_0011 SCI
Catalyst nanoparticle. Atom probe tomography (APT) image of a copper-cobalt-manganese catalyst nanoparticle showing its core (left) and outer shell (right). Cobalt atoms are blue, copper atoms are orange and manganese atoms are green. These nanoparticles can efficiently catalyse the production of the long-chain alcohols that are used in industrial chemistry. The outer shell is approximately 2 nanometres thick.
! EN_01087811_0001 SCI
Computer graphics stick representation of the molecular structure of graphite. Graphite, used in pencil leads and as a lubricant, has a crystalline structure composed of parallel layers of hexagonally arranged carbon atoms. Within each layer, carbon atoms are linked by strong covalent bonds, while the parallel layers are linked together by weak intermolecular forces known as ^IVan der Waals'^i forces (green broken lines). This Van der Waals's bonding is strong enough to hold the layers together, yet weak enough to allow them to slide over each other. Because of this, graphite is soft and acts as a solid lubricant.
! EN_01084902_0006 SCI
Computer graphics represenation of the molecular structure of nitrogen. The two nitrogen atoms that form the molecule are shown in blue. The molecular orbital displayed here in yellow & white shows a build up of bonding density between the two atoms that is characteristic of covalent bonding.
! EN_01084902_0015 SCI
Computer graphics representation of the protein trypsin, showing selected side chains. The image was produced using Chemical Design's Chem-X software.
! EN_01084902_0019 SCI
Computer graphics representation of one of the molecular orbitals of a probable reaction intermediary of benzene, C6H6. The six carbon atoms in the benzene ring structure appear as green spheres, with the six hydrogen atoms modelled as white spheres. The image was produced using Chemical Design's Chem-X software.
EN_00962647_4073 VAL
molecule
SPECIAL RATES FOR EDITORIAL AND BOOKS RF RATES FOR OTHER USE
EN_00962661_1698 VAL
molecule
SPECIAL RATES FOR EDITORIAL AND BOOKS RF RATES FOR OTHER USE
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_01178034_0003 SCI
Stain and waterproof cotton. Coloured scanning electron micrograph (SEM) of cotton fibres covered in nanoparticles (grey). The covering of nanoparticles prevents any water or dirt particles from reaching the cotton. Magnification: x8,300 when printed at 10 centimetres wide.
! EN_01178034_0004 SCI
Stain and waterproof cotton. Coloured scanning electron micrograph (SEM) of cotton covered in nanoparticles (blue). The covering of nanoparticles prevents any water or dirt particles from reaching the cotton. Magnification: x16,600 when printed at 10 centimetres wide.

góra

12
456... z 45