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Calendar . Subjects 2015

Hidden Cosmos (Meckes & Ottawa)

This year we offered two REM-calendars: Find more here (Martin Oeggerli) 2015 Hidden Cosmos
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Braconid wasp

The parasitoid wasp Aphidius colemani is an aphid parasitic wasp that uses its ovipositor to pierce lice and deposit an egg in it. Within seven days, the larva develops in the aphid, killing it. After another seven days of transformation the adult wasp slips from the dead aphid (mummy).

Scanning Electron Microscope, magnification 660:1
Deadly nightshade

A leaf of the deadly nightshade (Atropa belladonna) was cleaved by freeze-fracture technique. This makes it possible to look inside the chloroplast. In its center you see a starch grain, surrounded by a layered structure (thylakoids), the “solar reactor” of the plant.

Scanning Electron Microscope, magnification 60.000:1
Parasitic fungus

The fungus (Beauveria bassiana) infects mosquitoes, including their aquatic larvae. Therefore research is performed to make use of the fungus for decimating mosquitoes. The white fungal hyphae in the image grow on the base of the Anopheles mosquito antenna.

Scanning Electron Microscope, magnification 2.200:1

Bromeliads (here Guzmania jazz) live as epiphytes in Central and South American rain forests. Their leafs are shaped like a funnel for collecting water. Note the scaly leaf hairs on the leaf surface, which the plant uses to absorb water.

Scanning Electron Microscope, magnification 1.650:1
Helicobacter pylori

The gram-negative, pathogenic rod-shaped bacterium Helicobacter pylori colonizes the human stomach and duodenum. The bacterium was discovered only in 1983 and identified in 1989 as a disease germ. It is responsible for 75% of all gastric mucosal inflammations and virtually all duodenal ulcers.

Scanning Electron Microscope, magnification 60.000:1

Leishmaniasis is a parasitic disease of vertebrates. It is transmitted by bites from infected sandflies. 18 different types of leishmaniasis exist almost everywhere in the world. The spectrum ranges from the skin leishmaniasis, which is selfhealing, up to fatal courses with inner organ infestation. The image shows three Leishmania and two erythrocytes.

Scanning Electron Microscope, magnification 25.000:1
Common Twayblade

Three seeds of the Common Twayblade (Orchid, Listera ovata). The seeds of orchids are reduced to a covering and the embryo lying inside, but no nutrients. As a result, they are extremely small and light and can spread over great distances carried by the wind. They depend on a symbiosis with fungi to provide nutrients for germination.

Scanning Electron Microscope, magnification 440:1

The picture shows dorsal root ganglia nerve cells of a rat and the way they spread out in a cell culture. In the body these neurons sit outside the spinal cord and lead information like pain and touch sensations of the body to the brain. The projection (axons) of these cells can be up to a meter long.

Transmission Electron Microscope, magnification 25.000:1
Evening primroses

The evening primroses (Oenothera), originally native to North and South America, belong to the family of willowherbs or evening primroses. Here the surface of a pollen grain of the evening primrose is shown, with its characteristic filaments that hold the pollen in packets and probably support the attachment to insects.

Scanning Electron Microscope, magnification 11.000:1
Tobaccco leaf

The wild tobacco (Nicotiana attenuata) occurs in the southwest of the United States, especially after fires in pine or juniper forests. Tobacco is a nightshade plant, which produces the alkaloid nicotine in its roots. Nicotine is stored in the leaves and thus protects them against predators. A leaf rib with glandular trichomes can be seen here.

Scanning Electron Microscope, magnification 600:1
Proteus mirabilis

The rod-shaped bacterium Proteus mirabilis is a typical resident of the intestinal flora (Enterobakterium). It is very motile, possessing peritrichous flagella on the whole body. While harmless in the intestine, it can cause infections of the urinary tract, pneumonia, and sepsis in immuno-compromised persons.

Transmission Electron Microscope, magnification 80.000:1

The skin of the only 1mm small springtails is remarkable. Only at high magnification the complex structure of honeycomb and resting triangles is revealed. Even tubercles occur in this central European, strongly pink-colored type.

Scanning Electron Microscope, magnification 3.300:1
© copyright O. Meckes & N. Ottawa, eye of science
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