Hearing Sensors (Mus musculus)

Hearing Sensors This image shows the sensory epithelium of the inner ear (Organ of Corti), with the apical protruding hair bundle of hair cells. Scanning-electron-microscopic (SEM) image of a 22-week-old wild-type C57BL/6J mouse, carefully colored to harmonize with the natural shadows of the image and to highlight the invisibly small structures that are responsible for hearing in mammals. The organ of Corti was called after the Italian scientist (Alfonso Corti), who first described it. Its three rows of highly ordered hair cells, located inside the cochlea, are unique among other organs of the body and generate nerve impulses in response to sound vibrations. By Maurizio Cortada and Martin Oeggerli. Supported by Pathology, Univ. Hosp. Basel, and Bio-EM Lab, Univ. Basel.

Wonderland Forest - The Walnut Leaf (Juglans sp.)

Under the powerful magnification of a scanning electron microscope (SEM), the leaf of a Walnut (XY sp.) looks like a forest location in Wonderland. And much like the forest in Wonderland it is so huge that it never seems to end for its many bizarre micro-organisms that tend to get lost there. And should it end at one point - at the edge of the leaf - it will continue on the next leaf, et cetera. If you look close, whatsoever, this micro-forest consists of glands and leaf hairs (trichomes) rather than bushes and trees. Glandular trichomes are multicellular secretory structures on the leaf surface which are able to synthesize and store various chemical compounds in order to protect the plant (leaf) from herbivorous insects, fungi, pathogens, extensive light, high temperature, and even UVB radiation. In Juglans regia you can find thousnads of these especially on the emerging (young) leafs. Many of these chemicals are medically relevant and thus, Junglans regia has been widely used in traditional medicine for very different ailments including: helminthiasis, diarrhea, sinusitis, stomachache, arthritis, asthma, eczema, scrofula, skin disorders, and various endocrine diseases such as diabetes mellitus, anorexia, thyroid dysfunctions, cancer and infectious diseases. by Martin Oeggerli and Louisa Howard, Microscopy Facility, Dartmouth College.

Blood- and bone marrow stem cells (Homo sapiens) - Knochenmarkas

A stem cell or bone marrow transplant replaces damaged blood cells with healthy ones. It can be used to treat diseases such as leukaemia and lymphoma, which affect the blood cells of the patient. After removing damaged blood cells, healthy cells can be derived from blood- or bone-marrow (a spongy tissue found in the centre of some bones) stem cells. Stem cells can turn into different types of blood cells, including: - red blood cells – which carry oxygen around the body - white blood cells – which help fight infection - platelets – which help stop bleeding. By Martin Oeggerli, supported by SRK, Andi Buser and Andi Holbro, and Pathology Univ. Hosp. Basel, and Bio-EM Lab, Univ. Basel.

Cancer spreads during sleep (Circulating Tumor Cell Cluster)

Circulating Tumor Cell Cluster (CTC cluster; metastasis) on a microfluidic device

Bone Structure (Mus musculus)

This portion of the Petrous bone (Mus musculus) is protecting the inner ear structure. Though it is one of the hardest, densest bones in the body. Petrous comes from the Latin word petrosus, meaning “stone-like, hard”.

The human gut flora - bacteria (Enterobacter cloacae)

Enterobacter cloacae bacteria, coloured scanning electron micrograph (SEM). Enterobacter cloacae is a clinically significant Gram-negative, facultatively-anaerobic, rod-shaped (bacillus) bacterium. Members of the genus Enterobacter exist in water, soil and the intestinal and urinary tracts of humans. In hospital patients with lowered immunity E. cloacae may be the causative agent of urinary tract and respiratory tract infections. In addition, it may also infect wounds on the skin, and quite often shows multiple resistancy to antibiotics.

Valentine's Day - Assortment of pollen grains

Water Cabbage Pollen (Pistia sp.)

Water cabbage (Pistia sp.) is an invasive plant and was first described from Nile close to lake Victoria. Despite a tiny flower, the pollen is a medium sized elliptic monad covered with equatorial crests, which are rarely found features in the pollen universe.

Dill pollen (Anethum graveolens)

Dill (Anethum graveolens) pollen grain. It's an elongated, relatively small to medium size pollen grain featuring three apertures (i.e. pre-formed openings for exit of the pollen tube). Pollen grain by Martin Oeggerli and Louisa Howard, Microscopy Facility, Dartmouth College.

Snowdrop pollen (Galanthus nievalis)

Common snowdrop (Galanthus nievalis) is a typically wind pollinated plant. In early spring, the plant grow from bulbs –sometimes directly through snow- to open just a single flower. Pollen are oval shaped with a smooth surface.

Tape Amaranth pollen grain (Amaranthus sp.)

Amaranth (Amaranthus sp.) pollen grain. Pollen is a fine to coarse powder consisting of microgametophytes (=pollen grains), which produce the male gametes (sperm cells) of seed plants. Insect pollinated plants produce relatively low numbers of pollen grains compared to wind pollinated species. Each plant species has pollen grains that are unique due to the meticulous processes of evolution. While some have only one aperture (pre-formed opening to let the pollen tube exit), others may have three, six, or even double and triple the number. To have many pre-formed openings is assumed to be a more modern development: it allows the delicate pollen tube to emerge and dive right into the pistil tissue, without having to grow over an extensive stretch while being exposed to UV radiation, heat and other stress factors that could lead to damage of the tube and male gametes. Oeggerli slowly breathes life into his works by manually highlighting different structures with colors, layer upon layer on his laptop. The process allows him to set focus on the mysterious diversity and hidden morphological structures of pollen grains. by Martin Oeggerli and Louisa Howard, Microscopy Facility, Dartmouth College.

The Lodger - Face Mite (Demodex)

Demodex is a type of mite that lives in human hair follicles, usually on your face. Almost everyone has these mites, but they usually don’t cause problems, except if Demodex can multiply too quickly which is the case in people who are immunocompromised or have other skin conditions. In such a case, face mites can cause an itchy, irritating condition called demodicosis. The parasite is well adapted to its environment through thousands of years of co-evolution with Homo sapiens and extremely tiny (0.15 - 0.4 millimeters). It would take several of them to cover a pin head. Under a microscope, the mite looks slightly transparent and is often covered with scales. It has an elongated body with two segments. The first segment has eight legs and a mouth. When you sleep, the mites come out of your skin’s pores, mate, then go back into your skin to lay eggs. Demodex mites can spread from human to human. Babies aren’t born with mites, but they get mites from the people they live with. Two main species of Demodex live on humans: - Demodex folliculorum: usually lives in smaller hair follicles, especially your eyelashes. They eat skin cells. - Demodex brevis: usually lives near the oil glands in hair follicles. They eat sebum, a greasy substance made by oil glands. This is a photorealistically colored scanning electron micrograph by Martin Oeggerli. The artist also uses colors to make visible specific structures.

Suction Cup (Caterpillar foot)

Colored scanning electron micrograph (SEM) of a caterpillar foot (called proleg), co-produced with Sheri Neva, 2021. Insects have three pairs of legs which are located close to the head of the caterpillar. In addition, caterpillars are equipped with a number of fleshy prolegs further along the body. The prolegs help caterpillars to walk and get a grip, even on slippery surfaces. The proleg may be equipped with several rows of hooks (not in this species), and/or microscopically small hairs. These hairs enable the gecko to cling to smooth surfaces by taking advantage of weak intermolecular forces, known as Van der Waals forces, similar to the Gecko. The caterpillars of some butterfly species further produce threads of silk to secure and increase their steep climbing routes, and eventually also to produce the cocoon and attach it safely to a twig or leaf during metamorphosis. The silk of the Silkworm (caterpillar) is commercially woven into cloth.

The most primitive plant on earth - Liverwort (Marchantia polymo

LIVERWORTS are untypical non-vascular plants. They look very much like flattened moss, and measure only between 2-20mm. Due to the small size, liverworts are often overlooked, despite there are about 9.000 species. As a gardener you may wondered how they sometimes become so widely established in your greenhouse - here's why: a) The flat green leaf-like body of the liverwort spreads horizontally across the media surface by dividing into two branches at apical notches. Each apical notch contains a growing-point (called 'meristem'), that can growth laterally if there is media to grow on. Fragments that are dislodged or torn away from the mother plant then have the potential to become independent new plants. b) In addition, the upper surface of the liverwort features 3-4mm cup-like structures called gemma cups. They contain over 100 tiny, disk-shaped gemmae, which represent clones of the mother plant. When water droplets hit the cups, the tiny gemmae are propelled out, sometimes up to 15 cm in the air, and each gemmae can eventually develop into a new plant if the conditions of living fit. c) Finally, liverworts which are either male or female plants, can also spread through sexual reproduction. In the presence of water, sperm may swim from the male plant up on a nearby female structure and fertilize the ovum which develops into a spore that will be eventually be spread by air currents. Female plants produce spores in the thousands and they are very small (less than 3.5µm in diameter). Starting with Greek philosophers such as Aristotle and Theophrastus, liverworts have been mentioned in the herbal literature (in many cases as 'lichen'). In the Middle Ages in Europa the species Marchantia polymorpha was thought to be useful for treating diseases of the liver, based on the plants morphologically which resembles the human organ. Nowadays, liverworts are an interesting topic in modern research, because they stand at the very beginning of the plant tree of life and com

Stinging Vegetable Velcro (Eudnide bartonionides)

The Stingbush (Eudnide bartonionides) is a plant is a shrub which is native to desert areas in California, Arizona, Utah and Baja California. The leafs are equipped with short non-stinging ('velcro') hairs and special elongated stinging hairs (center). Stinging hairs (trichomes) produce a painful stinging sensation by injecting a chemical mixture when touched by humans or other animals. They act like hypodermic needles: after the tip breaks off, a chemical mixture composed of different chemicals that are injected and cause pain or paresthesia. Shorter 'velcro' hairs hold on your skin if you are touching the plant leaf, to increase damage and pain caused through elongated stinging hairs.

Synthetic Diamonds

Synthetic Diamonds A natural diamond is made from carbon and is the hardest natural known substance on earth. Natural diamonds are created over a period of one to three billion years, at least 85 miles below the earth’s mantle under natural conditions of very high pressure and high temperature. Once a diamond has been created in these underground conditions, it travels via molten rock to the earth’s surface, where it is mined, refined, and turned into beautiful jewelry or used for industrial purposes. Natural diamonds are slightly more durable, ranking 10 out of 10 on the Mohs Hardness scale, whereas synthetic (lab-) diamonds rank 9.25.

Capsugel boulders

Capsugel - Lonza - Pharmaceutical

human Microbiome of a KISS

The Human Microbiome of a Kiss. Artwork created by Martin Oeggerli (Micronaut) and dedicated to his 8-years old son Nelson. This image was originally produced for the National Geographic feature article 'How trillions of microbes affect every stage of our life-from birth to old age'. Soon after its public release, our daily life became heavily overshadowed by the world's coronavirus (COVID-19) pandemic - thereby instantly confirming the articles visionary title. Meanwhile (at end of April 2020), the crisis has not only severely limited the artists ability to work, but also prohibits him from officially visiting his son who is living in Switzerland, just a stone's throw away from the rest of the father's German-based patch-work family. This picture is based on scanning-electron-microscopy technology, and all colors are manually added by the artist in post-production, to visualize the immense diversity of the microbial community transmitted through a kiss. Whenever we kiss someone on the lips or cheeks invisibly small microbes are exchanged from one person to the other one! The variety of microbes that are part of our microbiome is mind-blowing, and the composition of the invisibly small communities can be the cause of many factors, including the human genetic makeup, diet, age, surroundings, and sexual behavior. Among humans, approximately 90% of cultures have some type of kissing. Usually it is platonic, such as a parent kissing a child. However, in 77 of 168 (46%) of all cultures, it can go as far as intimate (French-) kissing. Recently, a scientific study has revealed that on average 80 million bacteria are transferred to the partner during a kiss of 10 s. Most partners share a more similar oral microbiome compared to unrelated individuals and/or e.g. their kids. But some of the collective bacteria among partners are only transiently present, while others have found a true niche and survive permanently, allowing long-term colonization.With regard to kissing, th

The Gut Microbiota Miracle - Microbiome of a Newborn (H. sapiens

The microbiome of a baby, 1 month after birth. Hand colored scanning electron micrograph by Martin Oeggerli (Micronaut). The Gut Microbiota Miracle: this picture shows the microbiome of a newborn one month after birth. The importance of our intestinal bacteria is already well known – but much less is known about its development and diversity from a newborn to the adult. It has long been assumed that human breast milk is sterile. But scientists have discovered complex and dynamic bacterial ecosystems in human breast milk which are distinct from other microbioal communities and may also colonize and widen the diversity of the infant gut probiotic bacterial community. According to the study, the cocktail of beneficial bacteria passed from mother to infant through breast milk changes significantly over time and could act like a daily booster for infant immunity and metabolism, with important implications for infant development and health. Bacteria found in breast milk include Actinobacteria, Bacillariaphyta, Bacteroidetes, Cyanobacteria, Deinococcus-thermus, Firmicutes, Fusobacteria, Patescibacteria, Plantae, and Proteobacteria.

The Human Microbiome, Nr.2

Excrements revealing the bacterial flore of the human intestinal tract. If it comes to digestion, we are not alone! Among many more bacterial forms streptococci, staphylococci, enterococci, enterobacteria, mycobacteria, spirochetes, mycoplasma, corynebacteria, clostridia, or lactobacilli are living in our gastro-intestinal tract and usually help us to digest food, aid nutrient absorption, reduce dehydration or assist in the production of key vitamins. In adults, the bacterial flore makes up about five percent of the total body weight (similarlly to the brain). Altogether, more than 30'000 different species of bacteria have been classified in our intestinal tract, so far! However, it’s a fragile ecosystem. The bacterial flore is sensitive to stress, unhealthy food, alcohol or illness. Under unfavorable circumstances it directly affects our health and e.g. causes overweight, changes our mood or makes us prone to various diseases. The small intestine normally contains relatively low numbers of bacteria compared to the large intestine. If abnormally large numbers of bacteria grow in the small intestine, they may use many of the nutrients that a person would normally absorb for their growth. Too much growth and breakdown of nutrients can damage the cells of the small intestinal wall, leading to Crohn’s disease, diabetes, scleroderma and severely influence the progression of AIDS or immunoglobulin deficiency. This hand-colored scanning electron micrograph reveals the large number and variability of bacteria that are present in human excrements. Additionally, a plant fiber has passed the intestinal tract almost unharmed and spans across the frame (center). On the right hand side (half-cut) a large and spherical shaped structure turns out to be the cyste of a Giardia parasite (brown) - the actual reason why the person went to see a doctor... But apart from the unusual parasitic supplement the bacterial fauna looks fairly well-sorted.

Anthrax (Bacillus anthracis)

Anthrax bacteria (Bacillus anthracis) is a Gram-positive endospore-forming rod more commonly called “anthrax”. In 2001 the organism was used as part of a terrorist attack on the USA, where a highly virulent strain of anthrax was mailed to senators killing 5 people. This has heightened the concern around anthrax as a biological weapon (Schwartz, 2009). B. anthracis is commonly found in soil where it can lie dormant, potentially for hundreds of years. Herbivores often disturb soil when grazing and can ingest or inhale the B. anthracis spores. The bacteria can be transmitted readily from close contact with animals, soil or through ingestion of contaminated meat (from an infected animal) (Schwartz, 2009). Occupations at high risk of infection include veterinary surgeons, livestock farmers, butchers and persons who handle hides or wool. Treatment and antibiotic resistance: Contrary to popular belief, antibiotics are very effective in controlling B. anthracis infections if used early enough. Antibiotics such as ciprofloxacin, doxycycline, erythromycin, vancomycin and penicillin are all useful for treatment of B. anthracis infections (Moayeri and Leppla, 2004). There is also a monoclonal antibody (Raxibacumab) that is currently showing promise in clinical trials , which can be used in the prophylaxic treatment of B. anthracis infection. B. anthracis has shown some resistance to antibiotics in laboratory testing and possesses antimicrobial enzymes such as b-lactamases (Bryskier, 2002). Prevention and control: Preventative measures include immunisation of humans and animals and post exposure antibiotic prophylaxis (Bryskier, 2002). The currently available vaccines include AVA (anthrax vaccine adsorbed), which is licensed in the USA and AVP (anthrax vaccine precipitated), which is licensed in the UK; these are used to create immunity to B. anthracis pre-exposure (Bryskier, 2002). Where people or animals have died from B. anthracis, great care must be taken to handle

A Fuzzy Jacket for Cheese!

Artwork created by Martin Oeggerli (Micronaut). The picture is based on scanning-electron-microscopy technology, and all colors are manually added by the artist in post-production, to visualize characteristic microstructures of the microbiotic fungus Geotrichum candidum. The fungus G. candidum is a member of the human microbiome, notably associated with skin, sputum and feces where it occurs in 25–30% of specimens. It is also common in soil and has been isolated from soil probes collected across all continents. Furthermore, this yeast is the causative agent of geotrichosis. Pulmonary involvement is the most frequently reported form of the disease, but bronchial, oral, vaginal, cutaneous and alimentary infections have also been reported. G. candidum is also widely used in the production of certain dairy products including rind cheeses such as Camembert, Saint-Nectaire, Reblochon and other wrinkly cheeses that you may find at your local cheese shop. In a Nordic yogurt-like product known as viili, the yeast can be found as well, being responsible for the product's velvety texture. Furthermore, G. candidum has been reported as an organism that is able to break down plastic. Using in-depth genomic sequencing, French scientists recently unlocked the evolutionary history of this important cheese microbe and revealed a fungus with an identity crisis: all true yeasts are descendants of molds. They evolved a single-celled lifestyle from their moldy multi-cellular ancestors. Throughout this evolutionary process, they let go of habits such as growth using the filaments that create the fuzzy appearance of most molds. For a long time, Geotrichum candidum (hereafter G. candidum) has been a mycological mystery to both cheese makers and scientists. It has a fuzzy appearance when it grows on the surface of cheeses or on Petri dishes in the lab, but when you look under the microscope, it also has the appearance of tiny single cells that look like a yeast. And when scientists st

Stomach cells infection - Helicobacter pylori

In vitro cultured stomach cancer cells (red/brown), infected with Helicobacter pylori (yellow). Magenepithelzellen wurden in vitro gezüchtet und experimentell infiziert mit Helicobacter pylori; die Bakterien sind in gelb zu sehen, die Wirtszellen sind rot-braun. In vitro cultured stomach cancer cells (brown), infected with Helicobacter pylori (yellow). Helicobacter pylori, a common bacterium that lives in the stomach lining, increases the risk of stomach cancer and peptic ulcers. But over time H. pylori can reduce stomach acid and acid reflux, which may help fend off esophageal cancer. The microbe also appears to help protect us from allergies and asthma. Some scientists suspect that the dramatic increase in those conditions in the industrialized world could be related to the decreasing frequency of H. pylori in our stomachs, which is partly due to high doses of antibiotics in childhood.

Stinky Foot Bacteria

What causes smelly feet? Sweat is released throughout the day to keep the skin moist and supple. Sweat itself is odorless, but creates a beneficial environment for certain bacteria species to grow and produce bad-smelling substances. The same species are naturally present on our skin as part of the human flora, but in rather low numbers. Some shoes and socks can inhibit evaporation and thus increase the amount of sweat you produce, thereby providing the perfect environment for 'stinky-feet-bacteria' to thrive. Since our feet have more sweat glands than on any other part of the body they typically start to smell bad first.

Coronavirus Structures - CoV2

Coronavirus structures. 9 original TEM image scans, hand-colored by Martin Oeggerli.

Pixie dust with a rub in it (Brachypelma smithii)

Ever heard of urticating hairs? Tarantulas have the ability to bite, but urticating hairs are the invisible enemy. Many species of New World tarantulas (i.e. North and South American), can rapidly kick-up urticating hairs from their abdomens using their fourth legs in a rapid motion. The tiny hairs gently float up into the air like pixie dust. But pixie dust it is not. Avoid breathing the bristles or touching your eyes if you have any bristles on your fingers, as it can cause irritation. The urticating bristles can actually be fatal to rodents who inhale them. The urticating hairs themselves look like minuscule floating lint or dust to the naked eye. Under a scanning-electron-microscope they look like barbed spears, and there are six types. If allowed to land on your skin, they can sometimes cause redness and irritation, although I’ve personally only experienced this with Theraphosa tarantulas. It’s more annoying than anything, but a defense mechanism to avoid if possible. Some species have extremely mild urticating hairs, imperceptible to humans. Others, like the Goliath bird-eating tarantula (Theraphosa sp.) have urticating hairs that can itch and result in a mild rash. Hydrocortisone usually does the trick to alleviate any itching. Also, a tarantula may deliberately spread urticating hairs at the entrance to its burrow. Another use is to protect an egg sac, as the hairs help annoy would-be predators, such as fly larvae. It’s important to note that many species of tarantula that have urticating hairs available to them do actually never use them when handled. This includes Rose hairs and Redknees.

Microarchitecture of the tsetse fly proboscis (Nr.2)

Microarchitecture of the tsetse fly proboscis (Nr.2), manually colored SEM picture by Martin Oeggerli, 2021. Tsetse flies (genus Glossina) are large blood-sucking dipteran flies that are important as vectors of human and animal trypanosomiasis in Africa. The proboscis serves as the developmental site for the infective metacyclic stages of several species of pathogenic trypanosomes that are inoculated into the host with fly saliva. To understand the physical environment in which these trypanosomes develop, you have to look at the microarchitecture of the tsetse proboscis (see image Nr.1, not shown here) and especially at the tip which is usually concealed by surrounding mouthparts (image Nr.2, this is shown here!). SEM technology reveals what's hidden by sheer size - and it turns out the tsetse proboscis isn't just one tiny spear! Instead, the injection tool offers an enormous degree of complexity: a structure called labellum is hidden inside the proboscis and equipped with two 'flippers' at the tip. Sensory bristles and rod like structures are located on the surface of these flippers. They most likely sense tactile information during the sting, and may also register other (chemical) information. A barbed structure (silver) similar to a scarf is located at the very end of the labellum. It contains thousands of tiny hooks. Perhaps the scarf unfolds during the injection and stabilizes the proboscis with its hooks? Or it controls the flow of saliva? Or avoids influx of blood and microorganisms into the hypopharinx? Or it has several functions at once! The more you look at the details and enormous level of sophistication, the more fascinating it becomes (...). Overall, both SEM images confirm that the tsetse proboscis is a formidably armed weapon, specifically adapted for piercing skin, and highlight the utter importance this injection tool has for the fly.

Samurai Armor Protection - The Common Tick (Ixodes ricinus)

Common tick (Ixodes ricinus), hand-colored scanning-electron-micrograph image by science artist Martin Oeggerli. Karuta was a type of armour worn by samurai warriors in Japan. The word karuta comes from the Portuguese word meaning card, (carta) as the small square or rectangular plates that compose the armour resemble traditional Japanese playing cards. In a very similar fashion, the common tick is protected by rigid chitin plates against mechanical damage. Everyone who has ever tried to remove and crush a tick knows very well how tough it is to kill the beast. In addition to the armor-jacket, ticks have also developed other special equipment, e.g. to locate and prepare the right place for the sting (palpi and chelicerae), or to hold on persistently (hypostome and claws), and even resist when the host is moving fast, or is actively trying to remove the parasite by scratching or rubbing. Even more interesting it becomes, if you look at the exquisite details: the barbed stinger (hypostome) features a barrett file structure that is shaped with incomprehensible precision. Each leg ends with a pair of needle-shaped claws, and a fascinating combination of movable splints, adhesion (?) pads, and a mysterious sole which appears to be highly flexible like a towel that can be wrapped around the other structures of the foot. Another high-tech equipment, the Haller's Organ (not visible in this portrait), is located at the front legs and allows the tick to detect chemicals like carbon dioxide, ammonia, and pheromones. It can even sense humidity and infrared light emitted by the warm, blood-filled body a tick wants to find. In-line with the usual allegation of the tick that it can cause infections and spreads diseases (tick-borne encephalitis and/or Lyme disease), this specimen is carrying around a couple of fungi spores and tiny hyphens are sticking to the steel jacket, too. The risk of being bitten by a tick is highest between March and October. Ticks become active a

Sensory hairs of a shrimp

Leg hairs (called setae) of a shrimp (crustacea), hand-colored scanning-electron-micrograph by Martin Oeggerli (Micronaut). Most rustaceans (e.g. lobster, crabs, and shrimp) have an extensive array of sensory hairs covering their bodies and they have many different purposes. The setae are the tiny hairs on the legs of the shrimp. Setae can be used to filter food through the water and push it toward the mouth. Some shrimp use the setae to incubate fertilized eggs, and others use setae for grooming. Furthermore, the setae can be used to detect movement in the water, detecting current changes and water flow. It has been reported that some species have also developed highly specialized setae for chemosensory communication. Others use setae to detect water- and substrate-born vibrations and sound as part of their intraspecific communication. For example the sensory hairs (setae) located on the claws of the Australian freshwater crayfish are sensitive to water vibration frequencies between 150-300Hz. This picture shows the tips of setae which are arranged at the very tip of the legs of a freshwater shrimp (unknown species).

The Neuronal Megacity (Brain cell)

My concept concerning this picture was to compare a nerve cell to an island, or megacity, indicating the complex architecture of the brain. In detail, an infinite number of cellular extensions and microscopical structures unravels (capacity & complexity of the brain), whereas in the overview you can see a confusing tangle of connections that lead towards, or away, or around the center point, like the road network in a megacity. The edges of the picture are deliberately darkened and blurred, indicating there is a lot to be discovered and learned in this area of modern scientific research. Last but not least - the blue “sea” stands for Hawaii / Sophie H, to whom this picture is dedicated. Artwork created by Martin Oeggerli (Micronaut). The picture is based on scanning-electron-microscopy technology, and all colors were manually added to visualize the complex network as formed by neuronal cells in vitro.

Neuronal Highways - Brain Cells on a Chip

Preparations of electro-​active cells, predominantly brain cells, are placed directly atop fully processed microelectronics chips carrying thousands of electrodes. The chips are used to address fundamental questions in neuroscience and medicine. Artwork created by Martin Oeggerli (Micronaut). The picture is based on scanning-electron-microscopy technology, and all colors are manually added in post-production to visualize the research field of Electrophysiology and Neuroscience. We pursue an extracellular, bioelectronic approach to electrophysiology, which relies on the close juxtaposition of electrogenic cells (cells that produce electrical activity) and tissues with state-​of-the-art integrated electronic systems. The cell preparations (dissociated cells, tissue slices) are placed directly atop fully processed microelectronics chips carrying thousands of electrodes and featuring CMOS circuitry. The bio-​electronic interface consists of noble-​metal electrodes. Prospective fields of applications of our technology include, besides fundamental neuroscience research, pharmascreening, the investigation of mechanisms of neurodegenerative diseases, or the development of aural and visual prostheses. Electrophysiology is the study of the electrical properties of biological cells and tissues. It involves measurements of voltage changes or electric currents on a wide variety of scales from single ion channels to whole organs like the heart. In neuroscience, it includes measurements of the electrical activity of neurons and, particularly, action potential activity. Neuroscience is the scientific study of molecular, cellular, developmental, structural, functional, evolutionary, computational, and medical aspects of the nervous system. It is an interdisciplinary science that includes aspects of biology, chemistry, computer science, engineering, mathematics and medicine.

The human Retina - Nr. 3 (2019), vertical

With far more than 100 million nerve cells, the retina is the first stage of our visual system and our window to the outside world. The process includes detection of light impulses (photons) by different light receptors, in general called rods (120 million cells) and cones (6 million cells), and the fast and continuous translation, filtration and post-procession into electrical signals (or nerve impulses). These signals are then passed through the optical nerve’s 1.5 million fibres to the visual centre of the brain and reinterpreted into a cohesive image.The flexibility and economy with which retinal cells work together remains beyond our powers of imagination: the eye reports numerous signals to the brain at once, including separate detection of light (light on) and dark (light off), general patterns and finest details, movements and different hues (including: red, green and blue). This literally makes the eye a camera with 10 to 15 different films and despite it appears so naturally to us, the perception of an image is the result of a most complex interaction process involving millions of cells and the electrical signals they produce and pass on to the brain. What you can see on this image is the (1) rods and cones layer. It is located below the pigment epithelia which has been cut away during the preparation and is not visible on this image (black space on top). Below the rods and cones layer you can find the (2) outer nuclear layer (ONL) which contains the nuclei of the rods and cones. The adjacent (3) outer plexiform layer (OPL) is followed by the (4) inner plexiform layer (IPL), which contains numerous cell types, including horizontal cells, bipolar cells and amacrine cells. At the very bottom you can see the (5) inner nuclear layer (INL), followed by the (6) ganglion cell layer with two (7) blood vessels shown at left and (8) nerve fibers (which form the optical nerve).

Microscopic DNA-injection machine

This hand-colored scanning-electron-micrograph (SEM) shows a self-reconfiguring metamorphic nanoinjector for DNA injection into a zygote. The ability to transfer a gene or DNA sequence from one animal into the genome of another plays a critical role in a wide range of medical research—including cancer, Alzheimer's disease, and diabetes. The traditional method of transferring genetic material in-vitro into a new cell, called "microinjection," has a serious downside: it involves using a small glass pipette to pump a solution containing DNA into the nucleus of an egg cell, which results in a 25 to 40 percent cell death rate. Now, thanks to the work of researchers Brigham Young University, there's a way to avoid cell death when introducing DNA into egg cells. The MEMS nanoinjector's lance is incredibly small and no extra fluid is used with this technique, so cells undergo much less stress compared to the traditional microinjection process. "Essentially, we use electrical forces to attract and repel DNA—allowing injections to occur with a tiny, electrically conductive lance," explained Brian Jensen, associate professor in the Department of Mechanical Engineering at Brigham Young University. "DNA is attracted to the outside of the lance using positive voltage, and then the lance is inserted into a cell."

The Resonator

Hybrid spin-mechanical systems, formed by single spins coupled to mechanical resonators, have attracted ever-increasing attention over the past few years, triggered largely by the prospect of employing such devices as high-performance nanoscale sensors or transducers in quantum computing networks. In the Quantum Sensing Group of Patrick Maletinsky at the University of Basel, such hybrid systems comprising diamond mechanical cantilevers with embedded defect center spins are investigated as depicted in the image. Thereby crystal strain occurring upon cantilever displacement affords a natural and intrinsic mechanism to couple both systems. The research ultimately aims at investigating the potential of these systems for future fundamental physics studies and applications in sensing or information processing.

Pitcher plant (Nepenthes hemsleyana), Nr.1

Hand colored scanning-electron micrograph by Martin Oeggerli (Micronaut), showing the slippery surface inside a pitcher plant. Nepenthes hemsleyana is a tropical pitcher plant endemic to Borneo, where it grows in peat swamp forest and heath forest. It appears to rely on a prey trapping strategy unlike other pitcher plants: Interestingly, N. hemsleyana seems to have co-evolved with Hardwicke's woolly bats (Kerivoula hardwickii) which commonly roost in the upper pitchers. Studies shows that the carnivorous plant attracts bats by possessing modified pitfall taps that increase the reflectivity of echolocation calls - bats benefit by finding roosting sites, and the plants gain by receiving nitrogen from bat guano. Unlike in closely related pitcher plants, the upper pitchers of N. hemsleyana feature an expanded waxy zone (this structure is shown in the image) and a watery, less viscoelastic pitcher fluid. The pitchers also appear to lack UV patterns and produce less nectar and odour attractants, which is not required to host the bats.

Martian Landscape (Loasa tricolor)

As protection for the ovaries, the gynoeceum wall of Loasa tricolor reveals similarities with a bouncy castle. Analysed under high magnification, many plant surfaces remind us on martian landscapes. Oeggerli slowly breathes life into his works by painstakingly selecting and masking different structures with color, layer upon layer utilizing his laptop touchpad. It is a slow manual process which allows him to set focus on mysterious microscopic structures which look almost extra-terrestrial.

Peaceful Wilderness - The Oleander Leaf (Nerium oleander)

Under the powerful magnification of the scanning-electron-microscope (SEM), familiar objects turn into alien landscapes: this picture shows an ordinary oleander (Nerium oleander) leaf which is an every-day plant that can be found across the mediterranean and also throughout northern Europe, due to an increasing popularity among gardeners. While contemporary natural landscapes have been colonized and domesticized on a global scale over the past decades, this peaceful place on an Oleander leaf appears to have completely escaped contamination by human intervention - despite actually being part of it. The plant grows in a small bead & breakfast lodge close to the city of Basel, Switzerland.

Keep breathing - Plant epidermis with open pore (called stoma)

Plants "breath" through stoma on the lower surface of their leafs. Each stoma can be opened or closed through regulations of the turgor pressure.

A Coral in the Forest (Nectria cinnabarina)

Nectria cinnabarina, also known as coral spot, is a plant pathogen that causes cankers on broadleaf trees. This disease is polycyclic and infects trees in the cool temperate regions of the Northern Hemisphere. N. cinnabarina is typically saprophytic, but will act as a weak parasite if presented with an opportunity via wounds in the tree or other stressors that weaken the tree’s defense to the disease. Drought, other fugi and physical damage can make a tree susceptible to this pathogen which allows infection and leads to pink fungal blobs (indicative of its sexual stage) on the outside of dead wood. The pathogen thrives in dead wood and airborne spores infect living trees and shrubs through wounds. In summer and autumn, orange-red fruiting structures are produced; eventually these structures mature to dark red and can survive through the winter. This asexual stage is characterized by spongy conidia which can be distinguished by the hard, dark red blobs on the bark. Both of these structures release spores that can be dispersed by water and invade susceptible tissue. Nectria cinnabarina was first described in 1791 belongs to the same family as far better known Fusarium oxysporum f.sp. cubense, which represents a big threat for banana plants worldwide, causing the Panama disease.

Pollen grain of the Fish-poison tree (Barringtonia sp.)

Their size is measured in millionths of a meter, but the romantic journeys of pollen are epic: this spectacular pollen grain belongs to the Fish-poison tree, or Putat tree (Barringtonia asiatica). The flowers open during evening-night time during which bats and hawk moths swiftly visit for nectar collection, effecting in both self- and cross-pollination. Pollen grains are spherical with three apertures and feature an ornamented exine surface. Coloured scanning electron micrograph (SEM) By Martin Oeggerli (Micronaut), supported by Pathology, Univ. Hosp. Basel, Bio-EM Lab, Biozentrum, Univ. Basel, and H Halbritter and PalDat, Dep. Botany and Biodiversity, University Vienna.

Snowdrop pollen (Galanthus nievalis)

Common snowdrop (Galanthus nievalis) is a typically wind pollinated plant. In early spring, the plant grow from bulbs –sometimes directly through snow- to open just a single flower. Pollen are oval shaped with a smooth surface.