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tail in Biological News

Venomous sea snakes play heads or tails with their predators

... patterns to fool predators into thinking their tail is a second head, complete with lethal venom. ... Sea Krait has been found to twist its tail so that the tip corresponds with the dorsal view ... to see the "head" was facing him while the tail probed the coral. Rasmussen's surprise grew when ...

Nematode courting caught on camera

... neurotransmitter acetylcholine in regulating tail muscles to achieve an exploratory embrace. ... contact. He presses the front side of his tail against the hermaphrodite while he backs along ... vulva. If not found along this first side, the tail makes a sharp turn, curling round the end of the ...

TRAPping proteins that work together inside living cells

... DNA. One of the polymerase proteins has a tail that is known to touch the DNA and some helper ... starts translating. No one knew if this tail -- also known as the C-terminus of the alpha ... protein called the beta subunit, suggesting the tail of the alpha subunit makes contact with the beta ...

Diet secrets of 'the Royals'

... collars and analyzed carbon and other isotopes in tail hair to monitor the elephants' movements and diet ... for elephants to grab with their trunks, elephant tail hair shows a ratio of carbon isotopes different ... the scientists cut 1.8-foot-long samples of tail hair. The hair grows about an inch per month, so ...

Research yields potential target for cancer, wound healing and fibrosis

... the protein inside the cell. The beta-1 integrin tail is the portion found inside the cell. The beta-1 integrin tail has two functions -- it connects integrins to ... tail, that revealed the ability of this integrin tail to provide a scaffold for signaling proteins that ...

Johns Hopkins scientists pull protein's tail to curtail cancer

... compelled to genetically grab the protein by the tail and then watched as it got back to work at ... genetic engineering," he says. The flexible tail contains a cluster of four amino acids the ... modified, these amino acids act to "glue" the tail back to the body of PTEN and prevent the ...

Biologists learn structure, mechanism of powerful 'molecular motor' in virus

... of muscles. The virus consists of a head and tail portion. The DNA-packaging motor is located in the same place where the tail eventually connects to the head. Most of the ... the packaging step is completed, allowing the tail to attach to the capsid. The DNA is a complete ...

AGU journal highlights: Nov. 11, 2008

... 3. Comet-like tail of ion flux streams from Mars A comet tail has two entities: a neutral tail with debris along the orbit, and a ...

'A dinosaur dance floor'

... Collection of Dinosaur Footprints and a Few tail Drags Chan says the new study is the first ... State Park in Utah. The dinosaur tracks and tail marks near the Wave were preserved in the vast ... tail-drag sites worldwide, Seiler says. Four tail drags were within the 10 plots he surveyed, and ...

A protein sequence associated with Huntington’s disease may become life-saving vaccine component

... aggregates formed by an antigen fused to a polyQ tail resembled the droplets that conventional ... the immune response. So, attachment of a polyQ tail should specifically target the antigen to ... be answered. The adjuvant properties of the polyQ tail will have to be tested for each individual ...

How alligators rock and roll

... like internal floatation devices: toward the tail when they dive, toward the head when they surface ... their bellies, helping pull the liver toward the tail so the lungs inflate when the animal inhales. ... rock downward to dive or roll side-to-side. The tail also helps gators roll. The muscles ...

AGU journal highlights -- Feb. 26, 2008

... 1. Sodium glow reveals Mercurys comet-like tail Mercurys gravity is too weak to hold a ... components of this escaped gas form a comet-like tail that points away from the Sun. Baumgardner et al. study this tail by observing the bright yellow-orange light ...

Stanford researchers make first direct observation of 3-D molecule folding in real time

... made, so the jumbled portion is attached to a tail still under construction. The riboswitch must ... more tightly, tugging on its own incipient long tail and changing its shape in a way that will affect its eventual protein product. That RNA tail usually has a hairpin fold that straightens out ...

The life histories of the earliest land animals

... Per Ahlberg. Ichthyostega , which has robust limbs and only a small tail fin, appears to be the more terrestrial of the two. Its forelimb becomes ... weight-bearing position. Acanthostega has feebler limbs and a large tail fin, and seems to have been more aquatic. In this animal, there are no ...

CSHL researchers explain process by which cells 'hide' potentially dangerous DNA segments

... chemical "marks" that are added to histones at specific locations on their tail ends. These marks consist of methyl groups that get attached to the tail of one of the histones, histone H3, at a specific spot the ninth residue, ...

Tree lizard’s quick release escape system makes jumpers turn somersaults

... could see that the animals were tumbling backwards uncontrollably as their tail stump flailed around. Filming other tailless anoles, three more ... at take off to prevent themselves from spinning, or whether the trailing tail passively stabilises the animal's departure. He is also keen to find out ...

How do bacteria swim? Brown physicists explain

... to them. Caulobacter is a single-celled organism with a filament-like tail called a flagellum. As it swims, its rounded cellular head rotates in one direction, while the tail rotates in the opposite direction. This creates torque, which helps ...

Male seahorses are nature's Mr. Mom, Texas A&M researchers say

... the evolution of secondary sex traits in males (for example, a peacocks tail or antlers in deer). But in some species of pipefish, the sex roles are ... have a prehensile tail, meaning that, unlike most fish, they can use their tail to grasp onto things. These are all interesting changes, and were ...

Male seahorses are nature's Mr. Mom, Texas A&M researchers say

... the evolution of secondary sex traits in males (for example, a peacocks tail or antlers in deer). But in some species of pipefish, the sex roles are ... have a prehensile tail, meaning that, unlike most fish, they can use their tail to grasp onto things. These are all interesting changes, and were ...

Early environment may be key to determining bird migration location

... with very little water and not as good a food supply. By studying the tail feathers of young redstarts between their first and subsequent summer ... team measured a hydrogen isotope called deuterium, found in the fledglings tail feathers, an indicator of where the bird was hatched and, in subsequent ...

Scientists identify embryonic stem cells by appearance alone

... In the original experiment, the researchers took fibroblasts from the tail of this mouse and infected them with a special virus containing four genes ... in a typical skin biopsy (researchers used skin from either the end of the tail or from the ear of the mouse), that translates into thousands of stem ...

Lead-based consumer paint remains a global public health threat

... The UC team reports their findings in the journal Environmental Research online ahead of publication on Aug. 4, 2009. The report comes on the tail of the U.S. Consumer Product Safety Commission's enforcement of heightened restrictions on lead in American consumer paints, which will take effect ...

'Microfluidic palette' may paint clearer picture of biological processes

... in the prototype, but it could be moreallow various mixtures to flow into the chamber. Beneath the chamber, each access port connects to the long tail of a Y-shaped channel etched into a second layer. These channels deliver test chemicals to the chamber. Fluid flow in and out of the short arms of ...

Promising new treatment for Alzheimer's suggested based on Hebrew University research

... University, the researchers found that the mutation in the BChE-K gene damages the very end, or tail, of the resultant mutant enzyme protein. This tail is the part of BChE which is important for protection from the Alzheimer's disease plaques. It does this by interacting with the Alzheimer's disease ...

Ozone, nitrogen change the way rising CO2 affects Earth's water

... ecosystems and how long it stays there. Plants draw in water from the atmosphere and soil, and they discharge it naturally through transpiration, the tail end of photosynthesis when water vapor and oxygen are released into the air. The amount of water that plants give up depends on how much carbon ...

The faster they come

... and often, or that slower fish become more aggressive because they cannot manoeuvre quickly." The researchers also analysed whether damage to the tail and fins may affect the social position of a given individual, and found that, indeed, aggressive behaviours tend to decline as fin damage sustained ...

Mate selection: How does she know he'll take care of the kids?

... to Natasha Kelly , a graduate student in ecology and evolutionary biology at Yale and lead author of the study. The peacock's ornate fanned tail or the primping and posturing of a guy in a bar are "advertisements" or mating displays that take substantial energy to maintain. When a male's ...

Boston University biomedical engineers teach bacteria to count

... over and sticks it back in. Once the gene is backwards, it can no longer be transcribed but an extra snippet of DNA the researchers attached to its tail acts as a bookmark, showing protein-making machinery where to resume work. Each successive flip-over counts another event, and the fluorescing ...

Risk of vibration-induced vascular injuries linked to vibration frequency differences

... of locale. A second control group stayed in their home cages, uninvolved in the activity. After the last exposure, the scientists examined the tail arteries for changes. Neither control group had changes, suggesting the changes seen were directly related to the effects of vibration. The rats ...

First tri-continuous mesoporous Silica complex structure developed in Singapore

... a specially designed surfactant template, N,N-dimethyl-L-phenylalanine. This surfactant has a unique tunable head-group as well as a long hydrocarbon tail that has variable levels of hydrophobic (water-repellent) qualities. By systematically changing the synthesis conditions using this surfactant, IBN ...

Lab-on-a-chip homes in on how cancer cells break free

... and biomolecular engineering and co-author of the Nature Methods paper. "The cell stretches way, way out across the chip and then, on command, the tail snaps toward the body of the cell." Cells survive this programmed-release process and can be tested again and again, the researchers said. ...

Cretaceous octopus with ink and suckers -- the world's least likely fossils?

... Even if you have never encountered one in the flesh, the eight arms, suckers, and sack-like body are almost as familiar a body-plan as the four legs, tail and head of cats and dogs. Unlike our vertebrate cousins, however, octopuses don't have a well-developed skeleton, and while this famously allows ...

Female mammals follow their noses to the right mates

... mate choice. "[I]t is possible that in some mammals, males produce olfactory signals that match the elaboration and complexity of the peacock's tail or the sedge warbler's song ," Clutton-Brock and McAuliffe write. ...

Study offers clues to beating hearing loss

... 7 only has one. What's more, for the first time we've found how this myosin can be switched on and switched off. When switched off, the tip of its tail curls round and contacts the head, and switched on this contact is broken and the myosin stretches out. This knowledge should help inform any further ...

A new gene silencing platform -- silence is golden

... cellular splicing apparatus. By combining both capabilities in the same molecule, the U1 Adaptor can inhibit the pre-mRNA maturation step of polyA tail addition in a gene specific manner. Further, the domains of the oligonucleotide are independent so transcript binding and U1 snRNP binding can be ...

Origin of claws seen in 390-million-year-old fossil

... appendages with spines projecting inward along their length. The trunk section is made up of 12 segments, each with small appendages, and a long tail spine. Between the head and trunk, there is a pair of large triangular wing-like limbs that likely propelled the creature like a swimming penguin, ...

Largest prehistoric snake on record discovered in Colombia

... by its discoverers, the size of the snake's vertebrae suggest it weighed 1140 kg (2,500 pounds) and measured 13 metres (42.7 feet) nose to tail tip. A report describing the find appears in this week's Nature . Drs Jason Head and David Polly carried out much of the quantitative work behind ...

At 2,500 pounds and 43 feet, prehistoric snake is the largest on record

... by its discoverers, the size of the snake's vertebrae suggest it weighed 1,140 kilograms (2,500 pounds) and measured 13 meters (42.7 feet) nose to tail tip -- and that's a conservative estimate. A report describing the find appears in this week's Nature . "At its greatest width, the snake would ...

Viruses, start your engines!

... where it is protected from damage, enabling the virus to survive and reproduce. After the DNA is inside the capsid, the motor falls off, and a virus tail attaches to the capsid. Until now, researchers did not know how T4, or any other virus, accomplished the DNA packaging. According to Rao, "Since ...

'Gray's Paradox' solved: Researchers discover secret of speedy dolphins

... with short, powerful thrusts of their tails. The results show that dolphins produce on average about 200 pounds of force when flapping their tail about 10 times more force than Gray originally hypothesized. "It turns out that the answer to Gray's Paradox had nothing to do with the ...
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