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  • The toe hairs on a gecko's foot pads. Scanning electron micrograph (SEM) of hairs, or setae, from a gecko's (family Gekkonidae) toe. These hairs enable the gecko to cling to smooth surfaces by taking advantage of weak intermolecular forces, known as Van der Waals forces.
    K08semgeckofoot6col.jpg
  • The toe hairs on a gecko's foot pads. Scanning electron micrograph (SEM) of hairs, or setae, from a gecko's (family Gekkonidae) toe. These hairs enable the gecko to cling to smooth surfaces by taking advantage of weak intermolecular forces, known as Van der Waals forces.
    K08SEMgeckofoot9B.jpg
  • The toe hairs on a gecko's foot pads. Scanning electron micrograph (SEM) of hairs, or setae, from a gecko's (family Gekkonidae) toe. These hairs enable the gecko to cling to smooth surfaces by taking advantage of weak intermolecular forces, known as Van der Waals forces.
    K08semgeckofootb1A.jpg
  • Scanning electron microscope image of the mouth parts of a mosquito larva (family Culicidae).  The collection of hairs (light brown) are feeding structures used to filter water. The hairs beat through the water filtering out algae, bacteria and other micro-organisms that the larva feeds on.The calibration bar is 100 um and was take at a magnification of 1,440 x. ..
    K08semmosquito-larva023.jpg
  • Girl placing her hand on a Van de Graaff electrostatic generator, a device that transmits excess electrons. Strands of the young woman's hair repel each other because they are similarly charged; the child's hairstyle displays electric field lines.
    K11-vandeMere005.JPG
  • Girl placing her hand on a Van de Graaff electrostatic generator, a device that transmits excess electrons. Strands of the young woman's hair repel each other because they are similarly charged; the child's hairstyle displays electric field lines.
    K11-vandeMere002.JPG
  • Girl placing her hand on a Van de Graaff electrostatic generator, a device that transmits excess electrons. Strands of the young woman's hair repel each other because they are similarly charged; the child's hairstyle displays electric field lines.
    K11-vandeMere008.JPG
  • Girl placing her hand on a Van de Graaff electrostatic generator, a device that transmits excess electrons. Strands of the young woman's hair repel each other because they are similarly charged; the child's hairstyle displays electric field lines.
    K11-vandeMere007.JPG
  • Girl placing her hand on a Van de Graaff electrostatic generator, a device that transmits excess electrons. Strands of the young woman's hair repel each other because they are similarly charged; the child's hairstyle displays electric field lines.
    K11-vandeMere006.JPG
  • Close up of the leaf of a cannabis plant. The trichomes on the bud of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes. These stalked trichomes have glands at the sop that store THC. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  The width of the ball like structure is 90 um, or about the width of a human hair.
    K18optical-canna-bud20171011A.jpg
  • Close up of the leaf of a cannabis plant. The trichomes on the bud of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes. These stalked trichomes have glands at the sop that store THC. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  The width of the ball like structure is 90 um, or about the width of a human hair.
    K18optical-trichomeCanna2017-10-10A.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 52X when printed 10 cm wide.
    170613gland-triF031pan3.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    K170614leafC016pan03.jpg
  • Crystals in the roots of the Cannabis plant. The exact composition of these are currently unknown and their role in the life cycle of the plant is a mystery. Why are they there? What do they do? What is the chemical composition of the crystals? Just a few of the questions that seem to be a daily occurrence when looking at the cannabis plant with this level of magnification.<br />
Magnification on the printed page is 4300x at 9 inches wide.
    K170614Root-crystalscombo.jpg
  • Scanning Electron Micrograph (SEM) of a cross section of marijuana (Cannabis sativa) seed, showing the root and seed leaves enclosed. The field of view of this image is 4 mm in the horizontal direction.
    K170613cola-seedM057pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The head o fthe trichome is 60 um in diameter.
    K170607stemE038A-pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These trichomes are on teh surface of the leaf. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The circular cell structure a tthe center of the frame is 40 um in diameter.
    K170524CPD-triCN101mix.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-H062panC.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-C035A.jpg
  • Crystals in the roots of the Cannabis plant. The exact composition of these are currently unknown and their role in the life cycle of the plant is a mystery. Why are they there? What do they do? What is the chemical composition of the crystals? Just a few of the questions that seem to be a daily occurrence when looking at the cannabis plant with this level of magnification.<br />
Magnification on the printed page is 4300x at 9 inches wide.
    170614Root-crystalscombo.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leafH046pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leafH046pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170613cola-bladeH043pan3.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170613cola-bladeH043pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170613cola-bladeH043pan1.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170613cola-bladeA002pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractK035pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractD011pantk2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609bractC013pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609bractC013pan1.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609bractB008PANtk.jpg
  • A false color SEM image of a Calcium oxalate crystal.  Even a small dose of calcium oxalate is enough to cause intense sensations of burning in the mouth and throat.  Commonly found in popular houseplants, such as Dumbcane, the crystals effects or symptoms may last for a week or more, making calcium oxalate crystals a non-desirable ingredient in medicinal cannabis.  It is surprising that calcium oxalate is rarely discussed in literature about medical marijuana (cannabis).  There crystals are fairly common in plants, as they make it hard for grazing animals to eat the plant. Image is 20 um wide.
    K13SEM-pot-oxalate01A.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-cannnabis65.jpg
  • .Monarch Butterfly scales (Danaus plexippus)  Colored Scanning Electron Micrograph (SEM) of scales from the wing.  Magnification is 800 x and represents a field of view of .01 mm.
    K08SEMmonarch-WING043.jpg
  • .Monarch Butterfly scales (Danaus plexippus)  Colored Scanning Electron Micrograph (SEM) of scales from the wing.  Magnification is 400 x and represents a field of view of .2 mm.
    K08SEMmonarch-WING040.jpg
  • .Monarch Butterfly scales (Danaus plexippus)  Colored Scanning Electron Micrograph (SEM) of scales from the wing.  Magnification is 210 x and represents a field of view of .4 mm.
    K08SEMmonarch-WING037.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSC.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image. The filed of view of this image is 3 mm wide.
    K170609bractF028panA.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemA005pan.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1C.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170524CPD-B-M094panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1A.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517-A021panC.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 252X when printed 10 cm wide.
    K170512bottom1C.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. Thise is a low glandular trichomes that is close to the surface of the leaf. It secretes a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 20 um in diameter.
    K170510stem058thric.jpg
  • False color Scanning Electron Micrograph (SEM) of the underside of a new marijuana leaf (Cannabis sativa). The plant produces tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The filed of view in this image is 4 mm wide.
    K170509cryotest-zhp-alcuE0.jpg
  • A scanning electron microscope image of the stem of a young cannabis (Cannabis sativa) plant. The thorn-like trichomes use a physical defense to keep insects and animals from eating the plant. The stem is 1.5 mm diameter in this image.
    K170429-5day064C.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 52X when printed 10 cm wide.
    170614leafG043pan2.jpg
  • Rare double glandular trichome. Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leaf-FREEK-B004pan3.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 52X when printed 10 cm wide.
    170613cola-bladeC015pan1.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170613cola-bladeA002pan3.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractN053PANtk2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractM046pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractD011pantk.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractA002pantk2.jpg
  • Surface of  a mature cannabis stem. The image is 6mm wide.  The different layers of the stem have been given different colors.  The layer that is several cells below the skin is the section of thick-walled fiber cells.  This highlights one potential uses of cannabis: an excellent source of fibers for paper, rope, and fabric.  The legalizing of cannabis in the United States opens research in this very profitable aspect of the plant. Field of view of this image is 2 mm.
    K13SEM-pot-canna52.jpg
  • A cross section of a mature stem.   The different layers of the stem have been given different colors.  The layer that is several cells below the skin is the section of thick-walled fiber cells.  This highlights one potential uses of cannabis: an excellent source of fibers for paper, rope, and fabric.  The legalizing of cannabis in the United States opens research in this very profitable aspect of the plant. Field of vie of this image is 1 mm.
    K13SEM-pot-canna51.jpg
  • An optical image of the cross section of a cannabis stem.  The center of the structure is where the pith cells are located, in a mature leaf the center section would be completely filled with pith cells. This section has been dyed with neutral red.  This picture of thestem shows a 4 mm wide field of view.
    K13SEM-cannabis79.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 120x when printed 10 cm wide.
    K13SEM-canna-45.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-multiBSE-001.jpg
  • .Monarch Butterfly scales (Danaus plexippus)  Colored Scanning Electron Micrograph (SEM) of scales from the wing.  Magnification is 210 x and represents a field of view of .4 mm.
    K08SEMmonarch-Wing037B.jpg
  • .Monarch Butterfly scales (Danaus plexippus)  Colored Scanning Electron Micrograph (SEM) of scales from the wing.  Magnification is 110 x and represents a field of view of 1 mm.
    K08SEMmonarch-Wing035B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A04A.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    K170614leafC016pan01.jpg
  • Scanning Electron Micrograph (SEM) of a cross section of marijuana (Cannabis sativa) seed, showing the root and seed leaves enclosed. The field of view of this image is 4 mm in the horizontal direction.
    K170613cola-seedL055panB.jpg
  • Scanning Electron Micrograph (SEM) of a cross section of marijuana (Cannabis sativa) seed, showing the root and seed leaves enclosed. The field of view of this image is 4 mm in the horizontal direction.
    K170613cola-seedL055pan.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. The filed of view in this image is 4 mm wide. This flower has been pollinated and is startign to develop a seed.
    K170609BractP066panA.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemC010pan.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-H062panA.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-C035B.jpg
  • A cannabis seedling showing the first set of true leaves. Imaged with a scanning electron microscope (SEM). False color has been applied. The marijuana plant produces tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The filed of view in this image is 4 mm wide.
    K170516C022layers.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 252X when printed 10 cm wide.
    K170512bottom1B.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 252X when printed 10 cm wide.
    K170512bottom1.jpg
  • A scanning electron microscope image of the stem of a young cannabis (Cannabis sativa) plant. The thorn-like trichomes use a physical defense to keep insects and animals from eating the plant. The stem is 1.5 mm diameter in this image.
    K170429-5day064B.jpg
  • Scanning Electron Micrograph (SEM) of a sample if ice water hash or hashish. Shown in the image is a pile of glandular trichomes that have been concentrated in a unique process. Leaves with very high concentrations of stalked glandular trichomes are cooled in ice water then agitated. The agitation breaks off the trichomes, which in turn sink, to the bottom of the water.  Once separated from the water and dried, the ice water hash has some of the highest concentrations of THC of any physical separation process.  Since the stalked glandular trichomes are the location of the highest concentration of THC this technique in recent years has become very popular. The marijuana (Cannabis sativa) plant contains tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells in this sample are 60 um in diameter.
    K170403hashish01.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leafF035pan2.jpg
  • Rare double glandular trichome. Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leaf-FREEK-B004pan2.jpg
  • Rare double glandular trichome. Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170614leaf-FREEK-B004pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. Magnification: 52X when printed 10 cm wide.
    170613cola-bladeK048pan2.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609BractE019pan.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609bractC013pan3.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    170609bractB008PANtk3.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is x35 when printed 10 cm wide.
    K14SEMcannabis-cover3.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 90x when printed 10 cm wide.
    K14SEM-canna-46B.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 100x when printed 10 cm wide.
    K14SEM-canna-44.jpg
  • A false color SEM image of a Calcium oxalate crystal.  Even a small dose of calcium oxalate is enough to cause intense sensations of burning in the mouth and throat.  Commonly found in popular houseplants, such as Dumbcane, the crystals effects or symptoms may last for a week or more, making calcium oxalate crystals a non-desirable ingredient in medicinal cannabis.  It is surprising that calcium oxalate is rarely discussed in literature about medical marijuana (cannabis).  There crystals are fairly common in plants, as they make it hard for grazing animals to eat the plant. Image is 70 um wide.
    K13SEM-pot-oxalate02.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 450x when printed 10 cm wide.
    K13SEM-canna39.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 400x when printed 10 cm wide.
    K13SEM-canna38.jpg
  • A cross section of a mature Cannabis  stem.   The pith cells in the center of the cannabis stem. Pith is composed of soft spongy cells, which store and transport nutrients throughout the plant. . Magnification: x2200 when printed at 10 centimeters wide.
    K13SEM-canna-pith62.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-canna-37.jpg
  • Scanning electron microscope image of a  mosquito larva (family Culicidae). The larva hatches and lives in water until it attains its adult form. It breathes air through its siphon tube (upper right), This image represents a field of view of 2 mm...
    K08SEMMosquito-larva51.jpg
  • Cannabis plant. Colored scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant bud.  Glandular cells called trichomes are also present. These are capitate trichomes that have stalks. These trichomes secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug.  Magnification is 180x when printed 10 cm wide.
    K13SEM-pot-A01color-CSA.jpg
  • Color-enhanced Scanning Electron Micrograph (SEM) of the surface of a marijuana (Cannabis sativa) plant leaf, showing glandular cells, called trichomes. These are capitate trichomes that have stalks. They secrete a resin containing tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The spherical cells at the top of the trichomes are 60 um in diameter.
    K170614leafC016pan02.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image. The filed of view of this image is 3 mm wide.
    K170609bractF028panB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. The filed of view in this image is 4 mm wide. This flower has been pollinated and is startign to develop a seed.
    K170609BractP066panB.jpg
  • A scanning electron microscope image of the stem of a cannabis (Cannabis sativa) plant. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170607stemA005panB.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170524CPD-B-M094panC.jpg
  • A scanning electron microscope image of the football shaped bract of the female  cannabis (Cannabis sativa) flower. The oval bract structure houses the stigma and is responsible for producing seeds when the flower has been pollinated. This bract structure is also the location of the highest concentration of cannabinoid compounds on the plant.  This site is also the location of the highest concentration of THC. There are a number of different types of cell structures called trichomes in this image. The thorn-like trichomes use a physical defense while the circular glandular trichomes use chemical defense. Combined, these defenses keep insects and animals from eating the plant. Each circular glandular trichome is 50 um in diameter in this image.
    K170517bud-k070panA1B.jpg
  • False color Scanning Electron Micrograph (SEM) of the new growth at the tip of the bud of a marijuana plant (Cannabis sativa). The plant produces tetrahydrocannabinol (THC), the active component of cannabis when used as a drug. The filed of view in this image is 4 mm wide.
    k170509cryotest-zhp-alcuK066pan.jpg
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