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Sezione trasversale di stelo vegetale

A microscopic cross-section of a plant stem showing a ring of vascular bundles arranged around a central hollow pith, stained in vibrant crimson and turquoise against a white background.

A cross-section of a buttercup stem in brightfield, stained crimson and turquoise, a ring of vascular bundles round a hollow pith, thick-walled fibres and thin epidermal cells, 100x magnification, jewel colours on white. Mostra altro

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A microscopic cross-section of a plant stem showing vascular bundles with red-stained xylem and blue-stained phloem, illuminated by brightfield light.

A microscopic Volvox colony appears as a glowing, spherical structure against a black background, containing three smaller daughter colonies within its hollow, mesh-like frame.

A microscopic view of a circular, symmetrical diatom shell featuring intricate geometric patterns and iridescent light effects against a dark blue background.

A scanning electron micrograph of a single lily pollen grain, featuring a reticulate wall with raised ridges and sunken pits, and a prominent central furrow, false-colored in gold against a dark charcoal background.

A circular spherulite of vitamin C crystals, featuring radiating needles in vibrant shades of blue, gold, and magenta, is bisected by a dark cross against a black background as seen through a polarizing microscope.

A circular diatom shell with intricate geometric patterns and a glass-like structure is displayed against a solid black background in a dark-field microscopy style with blue and white highlights.

A scanning electron micrograph of Penicillium mould, showing upright stalks ending in brush-like heads with chains of round spores, set against a black background with a 200-micrometer scale bar.

A scanning electron micrograph shows the overlapping, shingle-like scales of a butterfly wing, with one scale broken to reveal its hollow interior structure.

A macro photograph of a watermelon tourmaline slice, featuring a pink heart-shaped center surrounded by concentric bands of white, pale green, and deep green, displayed against a bright, backlit surface.

A dense, stippled pen and ink illustration of a large cluster of ladybirds overwintering on a textured rock surface, with light catching their wing cases.

A circular piece of filter paper displays concentric rings of color—yellow, cyan, magenta, and violet—radiating from a dark central point, backlit to reveal the texture of the paper fibers.

A microscopic radiolarian skeleton with a spherical, hexagonal lattice structure and long, radiating spines, glowing in white and ice blue against a solid black background.

An aerial view looking straight down at a dense, circular flock of thousands of pink flamingos standing in the shallow, multi-colored waters of a lake, surrounded by swirling patterns of red and green algae.

A high-magnification fundus photograph of a human retina, showing the optic disc, macula, and branching retinal blood vessels against a golden-amber background.

$A high-angle, black and white photograph of cracked ice on a frozen lake, featuring a complex web of white fracture lines and scattered air bubbles against a dark background.$

Multiple spherical Volvox colonies with internal daughter colonies float in a dark, aquatic environment, illuminated with a soft green glow.

A detailed anatomical cross-section illustration of human skin showing the epidermis, dermis, and subcutis layers, including a hair follicle, sweat glands, and blood vessels.

A macro cross-section slice of a kiwi fruit is backlit on a white surface, highlighting the green flesh, central pale core, and ring of black seeds.

A microscopic cross-section of a plant stem showing distinct layers of xylem and phloem cells stained in vibrant pink and blue.

A black and white ink drawing of a chameleon's eye, featuring intricate concentric rings of beaded scales surrounding a central black pupil, with stippled shading on the lower portion.

A microscopic view of squid skin showing vibrant ruby, amber, and brown chromatophores scattered across a translucent surface with iridescent blue cells.

A scanning electron micrograph showing the microscopic surface of a leaf with several open stomata surrounded by guard cells, rendered in shades of magenta and purple.

A high-magnification scanning electron microscope image of a textured, spherical pollen grain against a black background, featuring selective false-color highlights in pink, orange, and blue.

A scanning electron micrograph shows numerous spiky, mustard-yellow pollen grains scattered against a dark background, with one smooth, tricolpate grain positioned near the center.

A macro close-up of soap foam bubbles with iridescent magenta, gold, and green swirling films against a dark background, illuminated by soft light from the left.

A scanning electron micrograph of a circular Coscinodiscus diatom featuring intricate glass lattice patterns and radial symmetry, rendered in iridescent teal and violet against a black background.

A thin section of mineral crystals viewed through a microscope with polarized light, displaying vibrant, multicolored geometric patterns and distinct black grain boundaries.

A watercolor illustration of an animal cell featuring a deep violet nucleus, coral-colored mitochondria, and various organelles rendered in wet-on-wet washes of lilac, teal, and coral on a textured paper background.

A detailed silk embroidery on midnight blue satin depicting a cell undergoing mitosis, featuring gold-threaded chromosomes and pale silk spindle fibers, captured in a flat, square-on view.

A close-up view of a dense carpet of vibrant green Sphagnum moss featuring numerous small, brown spore capsules rising on thin stalks in a forest environment.

A microscopic view of a circular, radially symmetrical diatom with intricate silica ribs and areolae, illuminated against a black background.

A yellow slime mold with a branching, vein-like network spreads across the surface of dark, damp tree bark, viewed through a circular microscope field of view.

A high-contrast white ink line art illustration on a black background depicting the intricate, radiating vein structure of a giant water lily leaf.

A cyanotype print depicting the microscopic structure of the windpipe lining, featuring white, feather-like cilia rising above a row of rounded cells against a deep Prussian blue background.

A highly detailed, symmetrical stellar dendrite snowflake with intricate fern-like branches, captured against a solid black background with cool-toned lighting.

A microscopic view of Allium cepa plant cells, stained with iodine to reveal their rigid cell walls and prominent nuclei.

A microscopic view of plant cells showing bright green chloroplasts within defined cell walls, illuminated against a dark background.

A microscopic view of a single centric diatom, featuring a circular, glass-like valve with radiating ribs and a marginal ring of pores, captured using differential interference contrast microscopy on a neutral grey background.

A microscopic view of plant cells featuring vibrant neon violet nuclei and electric lime cell walls.

A high-resolution close-up view of a sunspot group on the solar surface, featuring dark umbrae, a fibrous penumbra, and bright flaring kernels surrounded by golden solar granulation.

A circular view through a microscope lens displays a layered paper-cut art piece featuring various desmids, diatoms, and a green algal filament, all backlit to create a glowing, translucent effect.

A scanning electron micrograph of a gecko toe pad showing rows of curved lamellae covered in dense, branching setae with spatula-like tips, false-colored in teal against a dark charcoal background.

A detailed botanical watercolor illustration of a plant cell featuring a large central vacuole, a nucleus, chloroplasts, and other organelles within a rigid cell wall.

A suminagashi-style pattern features numerous concentric circular rings in dark indigo and black ink on a white background, with three pale green circular shapes resembling lily pads integrated into the design.

A thin section of gabbro viewed under crossed polarized light, showing twinned plagioclase crystals with grey and white stripes alongside pyroxene grains displaying vibrant green and magenta interference colors.

A collection of various pollen grains with diverse spiky and spherical textures, rendered in vibrant neon yellow and orange colors in a microscopic view.

A macro view of a detached, iridescent blue insect wing fragment with visible longitudinal ridges and a porous, hollow cross-section, set against a dark background.

A macro close-up of a sliced kiwi fruit, showing the pale central core surrounded by radiating black seeds and vibrant green flesh.

A macro photograph of oil droplets in water, featuring vibrant blue and orange circular bubbles with intricate internal patterns and backlighting.

A circular, radial cluster of crystalline needles viewed under polarized light, displaying a spectrum of interference colors including teal, violet, and gold against a dark background.

A high-contrast view of a sunspot group on the solar photosphere, showing dark umbral cores, filamentary penumbrae, and surrounding granulation with bright faculae near the limb.

A macro close-up of a dense cluster of soap bubbles forming a complex hexagonal lattice with bright white highlights and deep teal shadows.

A top-down view of a brain coral with intricate maze-like ridges and grooves, illuminated by sunlight filtering through shallow water.

A close-up, top-down view of a sunflower head showing the intricate spiral pattern of its seeds, illuminated by soft, warm light.

A microscopic view of Elodea leaf cells showing rectangular cell walls and numerous green chloroplasts under brightfield illumination.

A stylized, high-contrast risograph print in fluorescent pink and teal depicting a biological cell undergoing anaphase, with two sets of chromosomes being pulled apart by spindle fibers.

A scanning electron micrograph of a plant leaf surface showing multiple open stomata with lime green guard cells set against a textured magenta background.

A microscopic view of various diatoms, including circular centric frustules and elongated needle-like shapes, glowing in white and pale blue against a solid black background.

A microscopic view of plant cells featuring vibrant magenta cell walls and numerous glowing green chloroplasts.

A scanning electron micrograph of the underside of a hydrangea leaf showing multiple open stomatal pores, pavement cells, and a single trichome.

A macro close-up of a pale lime green, feathery insect antenna with delicate, comb-like sensory hairs against a solid black background.

A detailed, flat, top-down illustration of an animal cell with labeled organelles including the nucleus, mitochondria, Golgi apparatus, and endoplasmic reticulum, rendered in colored inks on a pale blue background.

A 3D digital illustration of a cell in prophase, featuring condensed purple chromosomes, a fading nuclear envelope, and two green spindle poles with radiating fibers inside a translucent cell on a pale blue background.

$A detailed hexagonal snowflake with concentric ridges and intricate corner structures, captured against a dark background with subtle light refraction.$

A microscopic bdelloid rotifer is captured in differential interference contrast, showing its transparent body, internal jaw structure, and twin ciliated crowns against a grey-blue background.

A scanning electron micrograph of a moth antenna, showing a central stalk with branching, hair-like sensory structures in shades of green.

A close-up, macro view of the intricate, winding ridges and deep valleys of a vibrant neon-green brain coral.

A macro, extreme close-up view of the center of a pink Protea flower, showcasing tightly packed, fuzzy filaments radiating from the dark core under soft, directional lighting.

A detailed ink drawing of a lotus seed pod with a circular face containing multiple seed holes, featuring cross-hatched shading and a curved stem on a plain white background.

A Kirlian photograph of a round nasturtium leaf against a black background, featuring a vibrant corona of violet and blue electric sparks radiating from its edges and faint glowing veins.

A macro close-up of a butterfly wing featuring a prominent eyespot with concentric rings of crimson, violet, black, and yellow scales.

A close-up, top-down view of a suminagashi-style ink pattern featuring concentric, wavering black and grey lines radiating from a dense, irregular knot at the center, printed on a textured cream-colored paper.