What is a summer solstice? Definition and explanation: The summer solstice, commonly referred to as midsummer, takes place on the 21st (and rarely on the 20th or 22nd) in June and is accompanied by the longest day and at the same time the shortest night of a year. It marks the astronomical and calendrical beginning of summer and defines the northernmost position of the sun on its imaginary orbit around the earth.
What is a ecosystem? Definition: A ecosystem (Greek oikos = house, systema = connected) consists of the combination of biotope and biocenosis. In other words, the living space and the organisms living in it together form a Цcosystem. Biotope and biocenosis never appear in isolation, but only in combined form as a ecosystem.
Description: Name: Rubin Other names: Korund Mineral class: oxides and hydroxides Chemical formula: Al 2 O 3 + Cr Chemical elements: aluminum, oxygen, chromium Similar minerals: sapphire Color: red Gloss: diamond luster possible Crystal structure: trigonal Mass density: approx , 0 Magnetism: non-magnetic Mohs hardness: 9 Stroke color: white Transparency: transparent to opaque Use: gemstone About Ruby: The ruby describes a variety of corundum, which is unmistakable by its red color.
Biosynthesis, Function and Effects Histamine is a biogenic amine widely distributed in the animal and plant kingdoms. In the human body, it acts both as a hormone and as a neurotransmitter. In its function as a hormone histamine is very versatile: it is the main messenger in natural defense reactions of the body, eg.
Characteristics Name: Gorilla More names: Lowland gorilla Latin name: Gorilla Class: Mammals Size: 1.40 - 1.70 m Weight: 100 - 200kg Age: 20 - 40 years Appearance: black coat Sex Dimorphism: Yes Nutrition Type: Herbivore (herbivor) Food: predominantly leaves Distribution: Central Africa Original Origin: Central Africa Sleep-wake-up-rhythm: diurnal Habitat: rainforest Natural enemies: / Sexual maturity: 6 - 10 years Mating season: throughout the year Carrying: 8 - 9 months Litter size: 1 young Social behavior: group-forming Critically endangered: Yes Further profiles of animals can be found in the Encyclopaedia.