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Calendar . Subjects 2018

[Subject to change without notice up to 09-30-2018.]

LifeSciences (Verborgene Welten) - Meckes & Ottawa

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Blood capillaries

The picture shows a freeze fracture through human tissue. Three blood vessels (capillaries) can be seen, the lowest one with four erythrocytes. The fracture through the wall of the vessels (endothelium) shows some cell nuclei (red-violet). Capillarys make the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between the blood and the tissues possible.

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Stinging apparatus of an Anopheles mosquito

The mosquito Anopheles gambiae is widespread in Yemen, Saudi Arabia and the drier areas of Africa. It is considered to be one of the most efficient malaria carriers worldwide. The images shows the tip of the proboscis . Orange colored is the cannula that penetrates into the skin. It is enveloped in the mandibles, above them are located the pairy palps.

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Leaf surface with wax

Here the leaf surface of a spurge (Euphorbia spec.) can be seen. On each knob one can see wax crystals, which are separated from the plant. The wax crystals in combination with the warty structure repel dirt and water. Some euphorbias are well known, f.e. poinsettias at Christmas.

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Fat cell

The fat cells (adipocytes) are among the largest cells in the human body. Almost the entire volume of each fat cell consists of a single lipid (fat or oil) droplet. Fats serve as rapidly mobilizable energy reserves.

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Cancer Therapy with CAR-Cells

In this new cancer therapy, immune cells are taken from the patient. The cells are genetically modified in the laboratory in such a way that they are able to identify cancer cells. After multiplication of these CAR-expressing T cells in vitro, they are transfused back into the patient to detect the cancer cells carrying the antigen.
A breast cancer cell (beige) is grown in culture. Two chimeric antigen receptor cells (CAR-Cells, red) got stuck on the cancer cell and start destroying it.

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A view of the head base of a jumping tail (Collembola, Neanurinae spec; Bilobella), in the middle top the tweezers-like mouth can be seen. These soil-dwelling, blind insects feed on bacteria and decaying plant and animal substances. Springtails have an abdominal, tail-like appendage, the furcula that is folded beneath the body to be used for jumping when the animal is threatened.

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Stinging Nettle

The stinging nettle (Urtica dioica) have stinging hairs, which probably serve to defend the enemy. The tips of the hairs come off when touched, transforming the hair into a needle that can inject several chemicals f.e. formic acid into skin, which causes burning and itching.

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Pollen of Acacia

Stamens (yellow) of an acacia blossom (Acacia spec.)with an emerging pollen (orange). Acacias are pollinated by insects. They belong to the mimosa genus and are found in the tropics and subtropics.

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Starch grains

In a broken grain of maize (Zea mays) the starch granules and the cell walls surrounding them are clearly visible. Maize has become a staple food in many parts of the world. It is native to Mexico. Starch, a polysaccharide, is an important energy store of plants and the most important carbohydrate of the human diet.

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LBifidobacteria (Bifidobacterium breve) change the pH-value of the environment through its metabolism and has a regulatory effect on the intestinal flora (sugar degradation to lactic acid). Therefore, Bifidobacterium breve is often used in probiotic food supplements. Other Bifidobacteria are part of the normal bacterial community of the gastrointestinal tract, appendix and Vagina (B. bifidum, B. adolescentis, B. longum and B. infantis).

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Fruit body of a Slime Mold

A bursting fruit body of Diacheopsis spec. a slime mold with spores emerging. Slime molds are primitive organisms consisting of one cell with millions of cores. They can be found in and on the forest ground. Slime molds feed on microorganisms that live in any type of dead plant material.

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Leg of a Mite

This leg of a mite (Acari) was found in a soil sample from the Colombian jungle. In addition to two claws, the foot also consists of a brush, which allows adhesion even on smooth surfaces (gecko effect, Van der Waals source).

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© copyright O. Meckes & N. Ottawa, eye of science
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