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Gymnosperm Stem: Epidermis and Cortex in Two Year Pinus

cross section: Pinus stem magnification: 400x During the first year of growth the cutinized epidermis is replaced by protective growth of cork rich periderm. The outer periderm consists of layers of cork cells, the phellem, which produces waterproofing suberin. Cork cells are dead at maturity. Deep to the phellem is a living layer of cork cambium or phellogen and beneath that, layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins. The cortex is divided into a thin outer hypodermis of lignified sclerenchyma cells and thicker inner cortex of thin walled parenchyma cells containing chloroplasts. Large resin ducts are surrounded by secretory parenchyma that produces resins and turpentines. Some cells enlarge into dark staining tyloses. Both endoderm and pericycle are inconspicuous. cross section: Pinus stem magnification: 400x During the first year of growth the cutinized epidermis is replaced by protective growth of cork rich periderm. The outer periderm consists of layers of cork cells, the phellem, which produces waterproofing suberin. Cork cells are dead at maturity. Deep to the phellem is a living layer of cork cambium or phellogen and beneath that, layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins. The cortex is divided into a thin outer hypodermis of lignified sclerenchyma cells and thicker inner cortex of thin walled parenchyma cells containing chloroplasts. Large resin ducts are surrounded by secretory parenchyma that produces resins and turpentines. Some cells enlarge into dark staining tyloses. Both endoderm and pericycle are inconspicuous.

Settling tank

RYB Color Blending

RYB Color Blending

Adult teeth or secondary teeth.

Adult teeth or secondary teeth.

Gymnosperm Stem: Cork in Three Year Pinus

cross section: Pinus stem magnification: 400x During the first year of growth the cutinized epidermis is replaced by protective growth of cork rich periderm. The outer periderm consists of layers of cork cells, the phellem, which produces waterproofing suberin. Cork cells are dead at maturity. Deep to the phellem is a living layer of cork cambium or phellogen and beneath that, layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins. cross section: Pinus stem magnification: 400x During the first year of growth the cutinized epidermis is replaced by protective growth of cork rich periderm. The outer periderm consists of layers of cork cells, the phellem, which produces waterproofing suberin. Cork cells are dead at maturity. Deep to the phellem is a living layer of cork cambium or phellogen and beneath that, layers of cork parenchyma or phelloderm. Many cells in the periderm contain dark staining tannins.

Turkish-paper texture-2

Turkish-paper texture for flyleaf. Turkish-paper texture for flyleaf

Back to School notebook and pencil

Notebook and pencil with white background. Notebook and pencil with white background

Lined notebook open with three pens

Open lined notebook open with three colored pens lying diagonally across one page, white background. Open lined notebook open with three colored pens lying diagonally across one page, white background.

Background, tonality of the colors

Background, tonality of the colors

The colour wheel

The colour wheel

Four color printing on paper under microscope

Four color printing on paper under microscope

School Bus Stop

School Bus Stop

Color Synthesis

Color Synthesis

Beijing china — beihai park

Beihai (North Sea) Park is one of the most popular parks in the city of Beijing. Early in the 10th century, the Liao Dynasty built a secondary imperial residence here, called Yaoyu or Jade Islet. When the Jin took over, they renamed the capital Zhongdu, meaning Central Capital, and built an imperial palace. Beihai (North Sea) Park is one of the most popular parks in the city of Beijing. Early in the 10th century, the Liao Dynasty built a secondary imperial residence here, called Yaoyu or Jade Islet. When the Jin took over, they renamed the capital Zhongdu, meaning Central Capital, and built an imperial palace.

Food chain vector illustration. Labeled nature eating model circle scheme.

Food chain vector illustration. Labeled nature eating model circle scheme.

Back to School notebook and pencil

Notebook and pencil with white background. Notebook and pencil with white background

teacher with kids vector illustration isolated

teacher with kids vector illustration isolated

The Rainbows of Niagara Falls.

The Rainbows of Niagara Falls.

Back to School notebook and pencil

Notebook and pencil with white background. Notebook and pencil with white background

Serious secondary schoolboy in uniform

Serious secondary schoolboy in uniform

Bonfire flames and hot sparks

A burning bonfire with yellow flames and hot burning embers rising against a black sky. A burning bonfire with yellow flames and hot burning embers rising against a black sky.

Turkish-paper texture-1

Turkish-paper texture for flyleaf. Turkish-paper texture for flyleaf

Herbaceous Dicot Stem: Parenchymatous Pith in Older Helianthus

cross section: Older stem: Helianthus common name: Sunflower magnification: 100x All vascular tissues in Helianthus are the product of primary growth. There are no signs of secondary growth (growth rings or lateral meristems) as might be seen in woody stems. The uniseriate and cutinized epidermis contains large multicellular trichomes and occasional stomata. The cortex consists of an outermost hypodermis of heavy walled collenchyma, a deeper layer of parenchyma and a deepest band of endodermis (starch sheath). Within the stele the vascular bundles are arranged in a ring and separated from each other by wide medullary rays of parenchyma cells. The collaterally arranged vascular bundles are almost entirely primary phloem and xylem. Each bundle consists of a large outer supportive cap of sclerenchyma fibers (phloem fiber cap), a deeper layer of primary phloem with well-defined sieve tubes and companion cells, and a deepest layer of primary xylem. In between the xylem and phloem, a narrow band of cambium may be seen. In some preparations, the highly lignified cells walls of xylem and mature sclerenchyma are stained red orange. These cells are dead at maturity and can also be distinguished by a heavy cell wall and absence of cytoplasm. The center of the stem is occupied by a pith of parenchyma cells that contain numerous starch storing amyloplasts. cross section: Older stem: Helianthus common name: Sunflower magnification: 100x All vascular tissues in Helianthus are the product of primary growth. There are no signs of secondary growth (growth rings or lateral meristems) as might be seen in woody stems. The uniseriate and cutinized epidermis contains large multicellular trichomes and occasional stomata. The cortex consists of an outermost hypodermis of heavy walled collenchyma, a deeper layer of parenchyma and a deepest band of endodermis (starch sheath). Within the stele the vascular bundles are arranged in a ring and separated from each other by wide medullary rays of parenchyma cells. The collaterally arranged vascular bundles are almost entirely primary phloem and xylem. Each bundle consists of a large outer supportive cap of sclerenchyma fibers (phloem fiber cap), a deeper layer of primary phloem with well-defined sieve tubes and companion cells, and a deepest layer of primary xylem. In between the xylem and phloem, a narrow band of cambium may be seen. In some preparations, the highly lignified cells walls of xylem and mature sclerenchyma are stained red orange. These cells are dead at maturity and can also be distinguished by a heavy cell wall and absence of cytoplasm. The center of the stem is occupied by a pith of parenchyma cells that contain numerous starch storing amyloplasts.

Spinal tumour

Back to School notebook and pencil

Notebook and pencil with white background. Notebook and pencil with white background

Western Lowland Gorilla sitting on log

Western Lowland Gorilla sitting on log

Chicken and Bacon Formal Dinner

Chicken and Bacon Formal Dinner

Back to School notebook and pencil

Notebook and pencil with white background. Notebook and pencil with white background

Pouring the wort into a fermenting bucket

Pouring the wort into a fermenting bucket

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