Топ-100

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Nucleic acid

Nucleic acids are large molecules where genetic information is stored. There are two types of nucleic acids: deoxyribonucleic acid, better known as DNA and ribonucleic acid, better known as RNA. The nucleic acids are made of nucleotides. A nucleo ...

                                               

Nucleobase

A nucleobase is a part of RNA and DNA which may be involved in pairing. Nucleobases are important for genetics. They include cytosine, guanine, adenine, thymine in DNA, uracil in RNA and xanthine and hypoxanthine mutated forms of guanine and aden ...

                                               

Nucleoplasm

Nucleoplasm is the contents of the cell nucleus. It is the protoplasm inside the nuclear membrane. It includes Many smaller molecules, and water. Large molecules such as enzymes of many types, and nucleotides. Larger organelles such as the chromo ...

                                               

Numbat

The numbat is a marsupial from open woodlands in western Australia. It is also called the banded anteater, because it eats termites. It is unusual in being one of the few diurnal daytime marsupials. It has no pouch, but the mother carries round h ...

                                               

Nyctimystes cryptochrysos

Nyctimystes cryptochrysos is a tree frog from Papua New Guinea. It lives on Fergusson Island between 900 and 1500 meters above sea level. Scientists think it might also live in the DEntrecasteaux Islands. The adult male frog is 4.8 to 5.1 cm long ...

                                               

Nyctimystes kuduki

Nyctimystes kuduki is a tree frog from Papua New Guinea. It lives on mountains with rainforests in Southern Highlands Province. The adult male frog is 5.8 to 6.1 cm long, which is large for a frog in Nyctimystes. It has yellow or gold veins on it ...

                                               

Nyctimystes ocreptus

Nyctimystes ocreptus is a tree frog from Papua New Guinea. Scintists found it on Mount Albert Edward, 2600 meters above sea level. Some may also live on Mount Victoria or Mount Knutsford. This frog has brown eyes. The veins in its lower eyelid go ...

                                               

Nymphaea

Nymphaea is a genus of aquatic plants in the family Nymphaeaceae. There are about 50 species in the genus, which is widely distributed. The common name, shared with some other genera in the same family, is water-lily or waterlily. Many species ar ...

                                               

Nymphaeaceae

In botany, Nymphaeaceae is the name of a family of plants which grow in water. The family is also called water-lily family. Their flowers suggest they are one of the earliest groups of angiosperms. Modern genetic analyses by the Angiosperm Phylog ...

                                               

Oarfish

An oarfish is a kind of very long, flat fish. "Oarfish" is another word for fish in the Regalecidae family. There are four species of oarfish in the world. The giant oarfish is the longest bony fish alive in the world today. It can grow up to 17 ...

                                               

Obdurodon tharalkooschild

Obdurodon tharalkooschild is an extinct species of platypus in the genus Obdurodon. Only one single tooth has been found. This was at the Miocene fossil beds in Riversleigh in Queensland, Australia. The tooth was discovered in 2012 by a team from ...

                                               

Ocean sunfish

The ocean sunfish is a large ocean fish found in warm and temperate oceans. It is the heaviest known bony fish in the world. It has an almost circular, flattened body. This unusual fish swims by flapping its long pectoral and dorsal fins, the cau ...

                                               

Oculocerebrorenal syndrome

Oculocerebrorenal syndrome is a rare genetic disorder in humans. It affects the eyes, the brain and the kidneys. It is also known as Oculocerebrorenal syndrome. People with lowe syndrome are born with cataracts, that is the lenses of their eyes a ...

                                               

Odd-toed ungulate

Odd-toed ungulates are the Perissodactyla, an order of mammals. Odd-toed ungulates have an uneven number of toes: Horses have only one toe, rhinoceros have three toes, and tapirs have four toes on the front feet and three toes on the hind feet. T ...

                                               

Odonata

The Odonata are an order of flying insects, the dragonflies and damselflies. Like most of the flying insects, they evolved in the early Mesozoic era. Their prototypes, the giant dragonflies of the Carboniferous, 325 mya, are no longer put in the ...

                                               

Oil spill

Oil from ships and oil tankers can spill onto the sea water and pollute the water. Oil poisons and harms the aquatic organisms and sea birds. The fur of sea mammals and the feathers of sea birds can be damaged by the oil. The animals may suffer, ...

                                               

Okinawa rail

The Okinawa rail is a species of bird endemic to Okinawa Island in Japan, where it is known as the Yanbaru kuina. is known to local people such as Agathi,Agacha,Yamadhui.

                                               

Old World monkey

The Old World monkeys or Cercopithecidae are a group of primates which are native to Africa and Asia today. The Old World monkeys live in a range of environments from tropical rain forest to savanna, shrubland and mountainous terrain. They are al ...

                                               

Old World vulture

Old World vultures belong to the family Accipitridae. This family also includes eagles, buzzards, kites, and hawks. Old World vultures are not closely related to New World vultures and condors. They do not share that groups good sense of smell. B ...

                                               

Old World warbler

An Old World warbler is the name used to describe one of a large group of birds that used to be in the bird family Sylviidae. The family held over 400 species in over 70 genera, and was the source of much taxonomic confusion. Two families were se ...

                                               

Oligochaete

Oligochaetes are a subclass of worms in the phylum Annelida. With around 10.000 species the Oligochaetes make up about a half of the phylum Annelida. These worms usually have few chaetae or "bristles" on the outer body surface, unlike polychaetes ...

                                               

Ophthalmosaurus

Ophthalmosaurus was an ichthyosaur of the Upper Jurassic, named after its large eyes. Well-preserved skeletons, ranging in age from juveniles to adults, have been found in Europe, North America and Argentina. Ophthalmosaurus had the largest eyes ...

                                               

Opossum

Opossums are the largest order of marsupials in the Western Hemisphere, the Didelphimorphia. They are often called possums, though that term is more properly applied to Australian fauna of the suborder Phalangeriformes. The Virginia opossum was t ...

                                               

Oral cancer

Oral cancer is cancer of any part of the mouth. It can start in the mouth, lips, or the oropharynx. A person can get oral cancer without having any other type of cancer. However, oral cancer can also happen because of metastasis. This means that ...

                                               

Orange-thighed frog

The orange-thighed frog, northern orange-eyed frog or lime tree frog is a species of tree frogs. They live in tropical places in Queensland, Australia. They are green with orange eyes. They also look like the red-eyed tree frog. The orange-thighe ...

                                               

Order (biology)

An order is a rank used in the biological taxonomy. Each order is split into families. There are many orders in each class.A group of closely related families forms an order. The similar characters are less in number as compared to different gene ...

                                               

Ornitholestes

Ornitholestes was a carnivorous dinosaur which lived in the Upper Jurassic period about 156–145 million years ago. It was about 2 metres long, half of which was its long tail. Only one specimen of it has ever been found. It is one of a group of s ...

                                               

Ornithology

Several aspects of ornithology differ from other disciplines, because they are easy to see and are often attractive. Many studies of birds have been done by amateurs working in a scientific manner.

                                               

Ornithurae

Ornithurae is the name of a natural group which includes all modern birds as well as their extinct relatives with plough-shaped pygostyles. This is a bone at the end of the tail which allows the tail feathers to fan and retract. Gansus, from the ...

                                               

Orthacanthus

Orthacanthus was an ancient, fresh-water shark that had a long spine growing from the back of its skull. It had a very long dorsal fin, which ran all along the sharks back, giving it an eel-like appearance. Orthacanthus was the terror of freshwat ...

                                               

Oryx

The Oryx is a fast-running hoofed mammal that lives in dry regions of Africa and Asia. They live in steppes, semi-deserts, and deserts.

                                               

Osteichthyes

Osteichthyes are a taxonomic superclass of fish, also called bony fish, that includes the ray-finned fish and lobe finned fish. The split between these two classes occurred around 440 million years ago. The Osteichthyes are paraphyletic with land ...

                                               

Osteoporosis

Osteoporosis is the weakening of bones in the body. It is caused by lack of calcium deposited in the bones. This lack of calcium causes the bones to become brittle. They break easily. Side effects include limping. Some symptoms late in the diseas ...

                                               

Overfishing

Overfishing is catching too much fish. It is a type of overexploitation where fish stocks are reduced to low levels. It is a good example of what is good for the short term is not good for the long term. Also, what is good for some fishermen is n ...

                                               

Ovis

Ovis is a genus of the subfamily Caprinae, of the family Bovidae. The wild sheep and domestic sheep and other animals like it belong to this genus. There are 5 or more animals in this genus.

                                               

Oxygen saturation

Oxygen saturation or dissolved oxygen is a relative measure of the amount of oxygen that is dissolved in a given medium. It can be measured with a dissolved oxygen probe such as an oxygen sensor. Or it can be measured with an optode in liquid med ...

                                               

Pachycephalosaurus

Pachycephalosaurus was a genus of ornithischian dinosaur which lived during the last five million years of the Upper Cretaceous. It lived in what is now North America. Pachycephalosaurus was a member of the Pachycephalosaurid family. This dinosau ...

                                               

Pachypleurosaur

Pachypleurosaurs were primitive sauropterygian reptiles that vaguely resembled aquatic lizards, and were limited to the Triassic period. They were long animals, ranging in size from 20 cm to about four metres in length, with small heads, long nec ...

                                               

Pacific tree frog

The Pacific tree frog is a species of tree frog. They live on the West Coast of North America. This includes California, Oregon and Washington in the United States, and British Columbia in Canada. They live on the ground, but some have been found ...

                                               

Painted lady

The painted lady is a butterfly in the Cynthia group of colourful butterflies. It is a relative of the red admiral butterfly. The painted lady is a subgenus of the genus Vanessa in the family Nymphalidae. They occur in most of the world. They are ...

                                               

Palaeognathae

The Palaeognathae or paleognaths are one of the two living superorders of birds. The other living superorder is Neognathae. Together these two clades form the subclass Neornithes. Paleognath is a word derived from the ancient Greek for "old jaws" ...

                                               

Pale frog

The pale frog, pallid rocket frog, pale rocket frog or peach-sided rocket frog is a frog from Australia. It lives in Western Australia, Queensland and the Northern Territory. The adult frog can grow to 4.0 cm long. It is light gray in colour with ...

                                               

Paleobotany

Paleobotany is a science that is part of paleontology. Paleobotanists look for and identify plant fossils from the distant past. Paleobotany is also about trying to understand past environments and the history of agriculture. Fossil pollen and sp ...

                                               

Pallass fish eagle

Pallass fish eagle, also known as Pallass sea eagle or band-tailed fish eagle, is a large, brownish sea eagle. It breeds in the east Palearctic in Kazakhstan, Russia, Tajikistan, Turkmenistan, Uzbekistan, Mongolia, China, India, Bangladesh, Myanm ...

                                               

Palm cockatoo

The palm cockatoo is a black or dark-gray parrot of the cockatoo family. In the wild, it eats nuts and palm tree fruit by cracking them open with its strong and curved beak. In captivity, people feed palm cockatoos a variety of fruits, vegetables ...

                                               

Pampas cat

The pampas cat or gato de las pampas is a small wild cat that lives in the Andes mountain range. They live in Argentina, Chile, Bolivia, Peru, Uruguay, Brazil, Ecuador, and Colombia. Some scientists think this cat is really three species, L. colo ...

                                               

Pancreatic cancer

Pancreatic cancer is cancer in the pancreas. It has a poor prognosis, with less than 5% of patients surviving beyond five years after the cancer has been diagnosed.

                                               

Emmeline Pankhurst

Emmeline Pankhurst was the leader of the British suffragette movement which helped women win the right to vote. In 1999 Time named Pankhurst as one of the 100 Most Important People of the 20th Century, stating: "she shaped an idea of women for ou ...

                                               

Papilioninae

Papilioninae is a subfamily of butterflies. It belongs in the family Papilionidae. The species are found worldwide. The caterpillars feed on plants in the following families: Rosaceae, Apiaceae, Aristolochiaceae, Magnoliaceae, Lauraceae, and Anno ...

                                               

Papilionoidea

The superfamily Papilionoidea has all the butterflies except for the skippers, which are in the superfamily Hesperioidea, and the moth-like Hedyloidea.

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Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

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