What is a microtubule? Definition: Microtubules (tubule) are understood to mean fine protein structures which are combined within the cell to form a tube-like system. The microtubules together with the intermediate filaments and the microfilaments form the basis for the cytoskeleton of the cell, which occurs in this form only in eukaryotes.
Selection factors Selection factors are those environmental conditions / factors that affect the individuals and thus their fitness. A distinction is made between abiotic (inanimate) and biotic (living) selection factors. The selection factors are crucial for the direction of evolution.
What happens in anaerobic respiration? Definition: Anaerobic respiration is the inner respiratory process of organisms that are able to do their energy metabolism completely without oxygen. On the chemical level, a redox reaction takes place. Instead of oxygen (O 2), however, nitrates, sulfates or fumarates (and a few others) serve as electron acceptors.
Adaptive Radiation Adaptive Radiation is the evolution of many new species from a single strain. Adapative radiations occur when the species is introduced into different ecological niches. Factors such as geographical isolation and the absence of natural enemies favor the process of Adaptive Radiation.
Overview From the Atom to the Chemical Reaction ... General Chemistry forms the basis for all other branches of chemistry. Without knowing the basics of chemical reactions, chemical bonds and properties of the elements, there is a scientific examination of the other subareas, in particular the Inorganic and Organic Chemistry, not possible.
Characteristics Name: Arnica Latin name: Arnica montana other names: Bergwohlverleih Plant family: Korbblьtler Number of species: approx. 30 species Distribution: Europe Plant location: acid soil Bldt: oblong Fruit:? Flower color: yellow Flowering period: June - September Height: 30-60cm Age: perennial plant Use: medicinal plant for tinctures Properties: antibacterial, anti-inflammatory, analgesic Plant Information: Arnica Arnica montana or true arnica describes a genus of about 30 species belonging to the family the basketbutter belongs.
Character Name: American Pit Bull Alternative Names: Original Origin: United Kingdom, United States FCI Group: / Size (up to 55cm) Height (): up to 48cm Weight (): up to 30kg Weight (): up to 24kg Life expectancy: 8 - 13 years Nutrition: Carnivore Sexual maturity: Litter size: 5 - 7 Coat color: white, black, brown Coat type: dense Coat length: short Character / Beings: self-confident, loyal, courageous Attitude: requires a lot of exercise and employment American Pit Bull - Introduction The History of American Pitt Bull Terriers dates back to the Middle Ages, when similar dogs were bred in Europe for fighting bears and bulls.
Definition: Antibodies (synonym: immunoglobulin) are plasma proteins from the group of globular proteins that are formed in response to the presence of antigens by the immune system, specifically the B lymphocytes. The antibodies to already known pathogens swim freely in the bloodstream.
Characteristics Name: Anis Latin name: Pimpinella anisum further names: Roman Fennel, Aniseed Plant Family: Carrot Family Number of Species: / Range: Originally Asia, today worldwide Plant Location: nutrient-rich soil; a lot of light leaves: hearty fruits: 0,5cm long, light brown flower color: white flowering time: June - September height: 20cm - 60cm age: Annual Use: u.
Characteristics Name: Baker's yeast Other names: Brewer's yeast, Baker's yeast Latin name: Saccharomyces cerevisiae Fungal family: Saccharomycetaceae Number of species: / Distribution: worldwide Ingredients: i.a. Biotin, iron, folic acid, potassium, niacin, phosphorus-containing poisons: / Habitat: worldwide Appearance / Characteristics: Eukaryote Size: 1 - 10 microns Usage: a.
What is the Beaufort scale? The Beaufort scale is a thirteen-level scale for measuring wind force. Although the use of wind forces is common in the weather forecast, the Beaufort scale is almost never mentioned. Although named after the British admiral and hydrograph Francis Beaufort (see picture), Beaufort has not developed the scale itself.
Characteristics Name: Common BeifuЯ Latin name: Artemisia vulgaris Other names: Companion, Verbena, Fruits Plant Family: Compositae Number of species: / Range: Northern Hemisphere Plant Location: rich in nutrients, partially shaded leaves: pointed jagged; about 5cm long; green top; white bottom fruits:?
What is the blastocyst? Definition: The blastocyst (Greek blastos = bud) emerges on the 5th day after fertilization from the morula. At this point, the blastocyst is already in the womb. For the first time in embryogenesis, differentiation of cell types occurs. From the internal cells (embryoblast) the embryo will develop later.
Atomic mass, symbol and atomic number Bohrium is an artificially created element with the elementary symbol Bh and atomic number 107. In the periodic table it belongs to the transactinoids with an atomic mass of 262.12 u. The chemical element discovered in 1976 is radioactive and is in a solid state of aggregation at room temperature.
Character Name: Bull Terrier Alternative Names: Bull Terrier Original Origin: United Kingdom FCI Group: Terrier Size (S): Up to 55cm Height (): Up to 50cm Weight (): 25 - 35kg Weight (): 20 - 30kg Life Expectancy: 10 - 12 Years Nutrition: Carnivore Sexual maturity: Litter size: 4 - 6 Coat color: white Skin type: dense, smooth Coat length: short Character / Essence: obstinate, active, loyal Attitude: partially prohibited by law Bull Terrier - Introduction The Bull Terrier comes from Central England, where he died around 1850 Birmingham-based pet trader was bred as a fighting dog.
Atomic mass, symbol and atomic number Boron is a naturally occurring element with the element symbol B and the atomic number 5. In the periodic table it stands with an atomic mass of 10.81 u in the 3rd main group. The chemical element discovered by Joseph Louis Gay-Lussac in 1808 is not radioactive and is in a solid state at room temperature.
What is a chemical element? Definition: A chemical element is a so-called pure substance, which consists only of itself and can not be split into different individual components using chemical methods. Currently, 118 different elements are known. Chemical elements can be clearly distinguished from each other by their atomic number.
Breathing simply explained: respiration (lat. Respirare = respiration) or respiration is a bi-ambiguous term used in biology, which is why it requires a more precise demarcation. External breathing describes the absorption of oxygen from the air. These include, for example, pulmonary respiration (mammals), gill respiration (fish) or tracheal breathing (insects).
Characteristics: Name: Calcite Other names: calcite, calcite Mineral class: carbonates and nitrates Chemical formula: Ca [CO 3] Chemical elements: calcium, carbon, oxygen Similar minerals: aragonite, dolomite Color: colorless, white Luster: vitreous Crystal structure: trigonal mass density : 2,7 Magnetism: non-magnetic Mohs hardness: 3 Stroke color: white Transparency: transparent to opaque Use: building material, gemstone About calcite: calcite or calcite describes a mineral that is widely used on earth and is mainly composed of carbonates Calcium and other minerals, oxygen and carbon.
Characteristics Name: British Shorthair Latin name: Felis silvestris catus Class: Mammals Size: about 50cm Weight: 3 - 8kg Age: 10 - 16 years Appearance: numerous coat colors possible, u.a. cream, white, red, black, blue and gray Sex dimorphism: No Diet type: Carnivore Food: Meat Distribution: Worldwide Origin: United Kingdom Sleep / wake cycle: diurnal Habitat: As a domestic cat near man Natural enemies: Fox , Martens, birds of prey sexual maturity: approx.