Fork-marked lemur.
Fork-marked lemurs (the genus Phaner) are primates native to Madagascar. Weighing around 350 grams (0.77 lb) or more, they are some of the largest members of the family of dwarf and mouse lemurs in the suborder Strepsirrhini. They have a dorsal forked stripe, dark rings around their eyes, and large membranous ears. Like other members of their family, they are nocturnal, and sleep in tree holes and nests during the day. Males are very vocal, making repeated calls at the beginning and end of the night. Monogamous pairing is typical; females are dominant, and are thought to have only one offspring every two years or more. Fork-marked lemurs run quadrupedally across branches in a wide variety of habitats, ranging from dry deciduous forests to rainforests. Their diet consists primarily of tree gum and other exudates, though they may obtain some of their protein by hunting small arthropods later at night. Three of the four species are endangered and the other is listed as vulnerable. Their populations are in decline due to habitat destruction.
Tuesday, 10 October 2017
Monday, 9 October 2017
Paul Kruger
Paul Kruger.
Paul Kruger (10 October 1825 – 14 July 1904) was one of the dominant political and military figures in 19th-century South Africa, and President of the South African Republic from 1883 to 1900. He was the face of the Boer cause against Britain during the Second Boer War of 1899–1902. As a child in the late 1830s, he took part in the Great Trek of people migrating east, away from the British Cape Colony. He witnessed the signing of the Sand River Convention with Britain in 1852 and over the next decade played a prominent role in the forging of the South African Republic, leading its commandos and resolving disputes between the rival Boer leaders and factions. After the South African Republic was annexed by Britain as the Transvaal, he became the leading figure in the movement to restore its independence, culminating in the Boers' victory in the First Boer War of 1880–81 and Britain's recognition of the republic as a fully independent state. During his presidency, tensions with Britain increased as thousands of predominantly British settlers arrived with the Witwatersrand Gold Rush. His portrait is on the Krugerrand, a gold bullion coin still being produced.
Paul Kruger (10 October 1825 – 14 July 1904) was one of the dominant political and military figures in 19th-century South Africa, and President of the South African Republic from 1883 to 1900. He was the face of the Boer cause against Britain during the Second Boer War of 1899–1902. As a child in the late 1830s, he took part in the Great Trek of people migrating east, away from the British Cape Colony. He witnessed the signing of the Sand River Convention with Britain in 1852 and over the next decade played a prominent role in the forging of the South African Republic, leading its commandos and resolving disputes between the rival Boer leaders and factions. After the South African Republic was annexed by Britain as the Transvaal, he became the leading figure in the movement to restore its independence, culminating in the Boers' victory in the First Boer War of 1880–81 and Britain's recognition of the republic as a fully independent state. During his presidency, tensions with Britain increased as thousands of predominantly British settlers arrived with the Witwatersrand Gold Rush. His portrait is on the Krugerrand, a gold bullion coin still being produced.
Paul Kruger
Paul Kruger.
Paul Kruger (10 October 1825 – 14 July 1904) was one of the dominant political and military figures in 19th-century South Africa, and President of the South African Republic from 1883 to 1900. He was the face of the Boer cause against Britain during the Second Boer War of 1899–1902. As a child in the late 1830s, he took part in the Great Trek of people migrating east, away from the British Cape Colony. He witnessed the signing of the Sand River Convention with Britain in 1852 and over the next decade played a prominent role in the forging of the South African Republic, leading its commandos and resolving disputes between the rival Boer leaders and factions. After the South African Republic was annexed by Britain as the Transvaal, he became the leading figure in the movement to restore its independence, culminating in the Boers' victory in the First Boer War of 1880–81 and Britain's recognition of the republic as a fully independent state. During his presidency, tensions with Britain increased as thousands of predominantly British settlers arrived with the Witwatersrand Gold Rush. His portrait is on the Krugerrand, a gold bullion coin still being produced.
Paul Kruger (10 October 1825 – 14 July 1904) was one of the dominant political and military figures in 19th-century South Africa, and President of the South African Republic from 1883 to 1900. He was the face of the Boer cause against Britain during the Second Boer War of 1899–1902. As a child in the late 1830s, he took part in the Great Trek of people migrating east, away from the British Cape Colony. He witnessed the signing of the Sand River Convention with Britain in 1852 and over the next decade played a prominent role in the forging of the South African Republic, leading its commandos and resolving disputes between the rival Boer leaders and factions. After the South African Republic was annexed by Britain as the Transvaal, he became the leading figure in the movement to restore its independence, culminating in the Boers' victory in the First Boer War of 1880–81 and Britain's recognition of the republic as a fully independent state. During his presidency, tensions with Britain increased as thousands of predominantly British settlers arrived with the Witwatersrand Gold Rush. His portrait is on the Krugerrand, a gold bullion coin still being produced.
Sunday, 8 October 2017
DNA nanotechnology
DNA nanotechnology.
DNA nanotechnology is the design and manufacture of technologically useful macromolecules using nucleic acids, the building blocks of DNA. In living cells, DNA is the carrier of genetic information. In the lab, strands of nucleic acids can spontaneously bind to form strong, rigid double helix structures with precisely controlled nanoscale features. Two- and three-dimensional crystal lattices, nanotubes, polyhedra, and various functional devices have been created. Tiles of nucleic acids can be assembled into larger units. Artificial DNA structures have been used to solve basic science problems in structural biology, biophysics and X-ray crystallography, and have helped identify protein structures through nuclear magnetic resonance spectroscopy. Potential applications in molecular scale electronics and nanomedicine are being investigated. The conceptual foundation for DNA nanotechnology was first laid out by Nadrian Seeman in the early 1980s, and the field began to attract widespread interest in the mid-2000s.
DNA nanotechnology is the design and manufacture of technologically useful macromolecules using nucleic acids, the building blocks of DNA. In living cells, DNA is the carrier of genetic information. In the lab, strands of nucleic acids can spontaneously bind to form strong, rigid double helix structures with precisely controlled nanoscale features. Two- and three-dimensional crystal lattices, nanotubes, polyhedra, and various functional devices have been created. Tiles of nucleic acids can be assembled into larger units. Artificial DNA structures have been used to solve basic science problems in structural biology, biophysics and X-ray crystallography, and have helped identify protein structures through nuclear magnetic resonance spectroscopy. Potential applications in molecular scale electronics and nanomedicine are being investigated. The conceptual foundation for DNA nanotechnology was first laid out by Nadrian Seeman in the early 1980s, and the field began to attract widespread interest in the mid-2000s.
DNA nanotechnology
DNA nanotechnology.
DNA nanotechnology is the design and manufacture of technologically useful macromolecules using nucleic acids, the building blocks of DNA. In living cells, DNA is the carrier of genetic information. In the lab, strands of nucleic acids can spontaneously bind to form strong, rigid double helix structures with precisely controlled nanoscale features. Two- and three-dimensional crystal lattices, nanotubes, polyhedra, and various functional devices have been created. Tiles of nucleic acids can be assembled into larger units. Artificial DNA structures have been used to solve basic science problems in structural biology, biophysics and X-ray crystallography, and have helped identify protein structures through nuclear magnetic resonance spectroscopy. Potential applications in molecular scale electronics and nanomedicine are being investigated. The conceptual foundation for DNA nanotechnology was first laid out by Nadrian Seeman in the early 1980s, and the field began to attract widespread interest in the mid-2000s.
DNA nanotechnology is the design and manufacture of technologically useful macromolecules using nucleic acids, the building blocks of DNA. In living cells, DNA is the carrier of genetic information. In the lab, strands of nucleic acids can spontaneously bind to form strong, rigid double helix structures with precisely controlled nanoscale features. Two- and three-dimensional crystal lattices, nanotubes, polyhedra, and various functional devices have been created. Tiles of nucleic acids can be assembled into larger units. Artificial DNA structures have been used to solve basic science problems in structural biology, biophysics and X-ray crystallography, and have helped identify protein structures through nuclear magnetic resonance spectroscopy. Potential applications in molecular scale electronics and nanomedicine are being investigated. The conceptual foundation for DNA nanotechnology was first laid out by Nadrian Seeman in the early 1980s, and the field began to attract widespread interest in the mid-2000s.
Saturday, 7 October 2017
Underwater diving
Underwater diving.
Underwater diving is the practice of descending below the water's surface to interact with the environment. Humans are not biologically adapted for deep diving, and must use special equipment to extend the depth and duration of their dives. In ambient pressure diving, with direct exposure to the pressure of the surrounding water, the diver can use breathing apparatus for scuba diving or surface-supplied diving. For repeated deep dives, divers can reduce the risk of decompression sickness by living in a pressurized environment on the surface to prevent pressurization and depressurization as they dive. Atmospheric diving suits may be used to isolate the diver from high ambient pressure. Diving activities are restricted to maximum depths of about 40 metres (130 ft) for recreational scuba diving, 530 metres (1,740 ft) for commercial saturation diving, and 610 metres (2,000 ft) if atmospheric suits are worn. The history of breath-hold diving goes back at least to classical times, and there is evidence of prehistoric hunting and gathering of seafoods that may have involved underwater swimming.
Underwater diving is the practice of descending below the water's surface to interact with the environment. Humans are not biologically adapted for deep diving, and must use special equipment to extend the depth and duration of their dives. In ambient pressure diving, with direct exposure to the pressure of the surrounding water, the diver can use breathing apparatus for scuba diving or surface-supplied diving. For repeated deep dives, divers can reduce the risk of decompression sickness by living in a pressurized environment on the surface to prevent pressurization and depressurization as they dive. Atmospheric diving suits may be used to isolate the diver from high ambient pressure. Diving activities are restricted to maximum depths of about 40 metres (130 ft) for recreational scuba diving, 530 metres (1,740 ft) for commercial saturation diving, and 610 metres (2,000 ft) if atmospheric suits are worn. The history of breath-hold diving goes back at least to classical times, and there is evidence of prehistoric hunting and gathering of seafoods that may have involved underwater swimming.
Underwater diving
Underwater diving.
Underwater diving is the practice of descending below the water's surface to interact with the environment. Humans are not biologically adapted for deep diving, and must use special equipment to extend the depth and duration of their dives. In ambient pressure diving, with direct exposure to the pressure of the surrounding water, the diver can use breathing apparatus for scuba diving or surface-supplied diving. For repeated deep dives, divers can reduce the risk of decompression sickness by living in a pressurized environment on the surface to prevent pressurization and depressurization as they dive. Atmospheric diving suits may be used to isolate the diver from high ambient pressure. Diving activities are restricted to maximum depths of about 40 metres (130 ft) for recreational scuba diving, 530 metres (1,740 ft) for commercial saturation diving, and 610 metres (2,000 ft) if atmospheric suits are worn. The history of breath-hold diving goes back at least to classical times, and there is evidence of prehistoric hunting and gathering of seafoods that may have involved underwater swimming.
Underwater diving is the practice of descending below the water's surface to interact with the environment. Humans are not biologically adapted for deep diving, and must use special equipment to extend the depth and duration of their dives. In ambient pressure diving, with direct exposure to the pressure of the surrounding water, the diver can use breathing apparatus for scuba diving or surface-supplied diving. For repeated deep dives, divers can reduce the risk of decompression sickness by living in a pressurized environment on the surface to prevent pressurization and depressurization as they dive. Atmospheric diving suits may be used to isolate the diver from high ambient pressure. Diving activities are restricted to maximum depths of about 40 metres (130 ft) for recreational scuba diving, 530 metres (1,740 ft) for commercial saturation diving, and 610 metres (2,000 ft) if atmospheric suits are worn. The history of breath-hold diving goes back at least to classical times, and there is evidence of prehistoric hunting and gathering of seafoods that may have involved underwater swimming.
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