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Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism.
plant Zea Stem C.S. under light mircoscope with white background
Illustration of animal cell anatomy
Trematode parasite under a microscope
Internal structure of an animal cell, 3d rendering. Section view. Computer digital drawing.
Photomicrograph of two rotifers. Rapidly rotating cilia at top of heads, internal organs visible. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.
Epidermis. Electron microscope micrograph showing a keratinocyte of spinous layer. The epithelial cell has a polygonal shape, central nucleus with nucleolus, cytoplasm full of keratin filament bundles, and numerous dark desmosomes crossing the intercellular spaces.
Natural agate surfaces, suitable for backgrounds and wallpapers.
Cross section leaf of plant under the light microscope view for botany education.
Liver Fluke Section under light microscope with white background
Leiden leaf c.s. under microscope
skin science 3d
Green algae cells background
stx2a is a subtype of Shiga toxin-producing E. coli (STEC) linked to Hemolytic Uremic Syndrome (HUS), a severe condition impacting kidney function and blood clotting. STEC poses a significant risk of foodborne illness and can spread within communities including family members.
Toxoplasma gondii oocyst under the microscope, isolated
Abstract Crystal background marble shot, nature pattern.
Photomicrograph of filamentous blue-green algae, Oscillatoria species. Each band along the stand is one cell. This filament is very short probably having recently parted from a longer one. Filaments are typically many times longer. This algae is mobile, it moves and twists through the water. San Francisco Bay, California, USA. Live specimen. Wet mount, 40X objective, transmitted brightfield illumination. Note - motion blur of live specimen, very shallow depth of field, chromatic aberration and uneven focus are inherent in light microscopy.
amazing inhabitants of the microworld under a microscope
Close-up of exquisite gemstone jewelry necklace from ancient China
Burkitt lymphoma is a form of non-Hodgkin's lymphoma in which cancer starts in immune cells called B-cells. Recognized as a fast growing human tumor, Burkitt lymphoma is associated with impaired immunity and is rapidly fatal if left untreated.
The illustration shows human chromosomes with differentiated coloration.
Squash preparation of  onion root tip cells stained to reveal chromosomes,  Bright field illumination, light microscopy.  This image was taken with the X40 objective lens.  Depth of focus is extremely low at this magnification.  Smaller apertures give greater depth of focus, but image quality deteriorates and resolution is greatly reduced.  The aperture in this image was optimised for contrast and resolution. Chromatic abberation is inevitable in light microscopy, but has been kept to a minimum in this image.
Spirogyra algae (filamentous green algae) under the microscope - optical microscope x400 magnification
Structure of Escherichia Coli
Plant tissue Structure, section (tissue) of stem plant tissue under a light microscope.
Doctor holding and showing  human Inner ear model of auditory system
Lily leaf c.s. under microscope
Photomicrograph of rotifer, probably Rotaria rotatoria. Rapidly rotating cilia at top of head, internal organs visible. Green circles are algae. Live specimen. Original image at 40X, wet mount, transmitted brightfield illumination. Indistinct image due to motion blur of live specimen and very shallow depth of field of brightfield illumination.
axial lung window chest ct scan 50 years old patient with chest pain showing  bowel  dan gaster visible in  left chest and displacement of the mediastinum to the right
Molecular model of amylose, one of the two sugar components in starch
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