Tag: "symmetric" at biology news
Common lineage suggested for viruses that infect hosts from all three domains of life
... the viruses studied, one vertex of the apparently symmetric
coat is different and used for DNA packaging. With this knowledge in mind, researchers could explore whether human viruses with similar coat proteins also have a unique vertex devoted for DNA packaging. If so, new anti-virals could be developed to t...
A bug's life: aging and death in E. coli
...es without a juvenile phase and with an apparently symmetric
division - revealing that these bacteria, like other organisms, have not escaped mortality. E. coli reproduces by dividing in the middle. Each resultant cell inherits an old end or pole and a new pole, which contain slightly different components, ...
Scientists find microRNAs regulate plant development
...particularly struck by the unusual quadrilaterally symmetric
seedlings we uncovered in our study. This result implies that the Arabidopsis embryo relies on microRNA restriction of ARF17 activity to achieve normal bilateral symmetry." A second report focuses on the function of the protein ARGONAUTE1 (AGO1), a m...
Figuring out the ups and downsand sidewaysof neural development
...uring final brain development, the cells return to symmetric
cell division, creating differentiated adult cells. The two types of cell division seem to be governed by the orientation of the tiny bundles of fiber-like microtubules called spindles inside the dividing cell--whether the spindles are oriented paral...
USC researchers track down the stem cells that create feathers
...e functional morphology. For example, the radially symmetric
downy feathers found on chicks and on the trunks o...lts are designed for warmth, while the bilaterally symmetric
feathers found on the adult wing are designed for taking flight. What Chuong and his colleagues fou...
Rutgers researchers scientifically link dancing ability to mate quality
... results by the sex of the dancer. They found that symmetric
males received better dance scores than symmetric
females and that female evaluators rated symmetric
men higher than male evaluators rated symmetric
Biologists build better software, beat path to viral knowledge
...urprising to researchers accustomed to seeing only symmetric
viruses up close. "Epsilon 15's tail, for example, has six 'spikes' in it, but they aren't arranged in a neat hexagonal ring. They're highly deviant," Jiang said. "Because they're so off-kilter, only two of the spikes actually grasp the shell surface...
Mouse, frog and bird put Snail and Slug to different uses
... While the body plan of all vertebrates is overtly symmetric
on both body sides, most internal organs exhibit an asymmetric distribution. For example, in mammals the heart is located on the left side of the body while the liver is on the right. Gridley and Murray found that, similarly to what has been describe...
Ossur takes another giant step in prosthetic technology
...oning. For an amputee, this means a more balanced, symmetric
and confident gait even when climbing stairs or hills, the unprecedented ability to stand up or sit down naturally from a chair, and less consequential strain on the rest of the body. It joins two other prosthetics which utilize Ossur's Bionic Techno...
How did bilaterally symmetric flowers evolve from radially symmetric ones?
How did bilaterally symmetric
flowers evolve from radially symmetric
ones? To address this important question, geneticists Francisco Perfectti and Juan Pedro M. Camacho,...
Aging boosts chances that a family line will be long-lived
...ular material or even organs. In what is called symmetric
reproduction, a cell divides in two and splits the damage equally among the succeeding generation of cells. In asymmetric reproduction, the parent retains the damage associated with aging. Symmetric reproduction favors a longer life for an individ...
Carry on walking!
...ssed walking at a constant speed carrying either a symmetric
load, in the form of a weighted vest or a 5kg dumbbell in each hand, or carrying an asymmetric load, which was a single 10kg weight carried in one hand, or a mannequin infant on one hip. Results indicated that when carrying an evenly spread load h...
Existence of muscle-building stem cells points to regenerative therapies for muscular disease
...ng the molecular regulation of satellite stem cell symmetric
versus asymmetric cell division will lead to identification of biologics or small drugs that specifically target the relevant pathway leading to satellite stem cell expansion."...