Bdelloidea are microscopic aquatic animals that are related to roundworms

Bdelloidea are microscopic aquatic animals that are related to roundworms, found in freshwater and moist soil. Interestingly, a male has never been observed within the species; females reproduce exclusively by parthenogenesis (without fertilization).

Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

☤ MD ☞ ☆☆☆ Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

Fat cell. Coloured scanning electron micrograph (SEM) of an adipocyte (fat cell, blue). Surrounding the adipocyte are white blood cells (red). | I want to poke it with a stick

Coloured scanning electron micrograph (SEM) of an adipocyte (fat cell, blue). Surrounding the adipocyte are white blood cells (red). Such a lovely color.

Grains of pollen come in all shapes and sizes. The large object in the centre of this image is pumpkin pollen; the tiny speck just below and to the right of it is forget-me-not pollen

Hayfever sufferers, know your enemy: Scanning Electron Microscope pictures of grains of pollen

Grains of pollen come in all shapes and sizes. The large object in the centre of this image is pumpkin pollen; the tiny speck just below and to the right of it is forget-me-not pollen Picture: MICRONAUT / CATERS

Fertilisation. Coloured SEM of a sperm attempting to penetrate a human egg. The sperm has a rounded head and a long tail with which it swims. Women usually release one ovum/month, whereas men release millions of sperm in each ejaculation. Only one of these sperm can penetrate the egg's thick outer layer-zona pellucida and fertilise it. Fertilisation occurs when the sperm's genetic material fuses with the egg's DNA. When this occurs the egg forms a barrier to other sperm.

Coloured scanning electron micrograph (SEM) of a sperm (blue) attempting to penetrate a human egg (orange). Actually, it takes a great number to weaken the outside of the egg enough for one to fertilize it.

Nerve fibres. Coloured scanning electron micrograph (SEM) of fractured myelinated nerve fibres. The myelin sheath is green, the axoplasm is pink and the endoneurium (connective tissue) is blue. Magnification: x800 when printed at 10 centimetres wide.

Nerve fibres. Coloured scanning electron micrograph (SEM) of fractured myelinated nerve fibres. The myelin sheath is green, the axoplasm is pink and the endoneurium (connective tissue) is blue. Magnification: x800 when printed at 10 centimetres wide.

A coloured scanning electron micrograph of a tomato.  Picture: SPL / Barcroft Media. Reference: Telegraph.co.uk. 2013. Food under the microscope: scanning electron micrographs of foodstuffs - Telegraph. [online]

Food under the microscope: scanning electron micrographs of foodstuffs

Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Colored scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart

Scanning electron microscope (SEM) image of human muscle tissue collected from an 18 year old male during tooth surgery. The  connective tissue I  collagen fibers and red blood cells . Magnification x4200 when printed 10 cm wide.

Scanning electron Muscle Muscle tissue -microscope (SEM) image of human muscle tissue collected from an 18 year old male during tooth surgery. The connective tissue I collagen fibers and red blood cells . Magnification when printed 10 cm wide.

Coloured scanning electron micrograph of the surface of the mineralised cell wall of an unidentified diatom #microscopic

Coloured scanning electron micrograph (SEM) of the surface of the mineralised cell wall (frustule) of an unidentified diatom from Science Photo Library.

Scanning Electron Micrograph of normal human eye showing anterior of iris and pupil

Iris and pupil close-up . Scanning Electron Micrograph of normal human eye showing anterior of iris and pupil .

Staphylococcus saprophyticus scanning electron micrograph › Micronaut: The fine art of microscopy by science photographer Martin Oeggerli

Staphylococcus saprophyticus scanning electron micrograph › Micronaut: The fine art of microscopy by science photographer Martin Oeggerli

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