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Tag: "density" at biology news

Regulating the nuclear architecture of the cell

... reside in euchromatin, which is of relatively low density and where the DNA is more accessible to the machinery of gene transcription. By contrast, heterochromatin is dense and contains relatively few genes; most of the DNA in heterochromatin, including numerous short repeated sequences, does not code for p...

Edge density key to controlling gypsy moth spread

...e edges of the population area. If the population density is low, the Allee effect prevents growth across the boundaries. The model showed that no pulsed expansion exists for populations unaffected by the Allee effect. However, when the it is a factor, not only does pulsed expansion occur, but it mimics the...

For crickets, parasitic flies can stop the music

...y have to do with the subtle interplay between the density of flies, the density of crickets and the presence of other predators that prey on walking crickets. Walkers may do bet...

Bacteria that use radiated water as food

...ed to radiation from uranium-bearing rocks. High density DNA microarray analysis revealed a vast number of bacterial species present, but the samples were dominated by a single new species related to hydrothermal vent bacteria from the division Firmicutes. The ancient age of the fracture water and comparat...

New technology used to construct the first map of structural variation in the human genome

...of the algorithm, coupled with the increased probe density of these arrays, permitted the identification of approximately 1,000 CNVs, many of which were below the detection size limit of alternative methodologies. Furthermore, the algorithm more accurately estimated CNV boundaries, thereby permitting a deta...

Microcapsules like it hot and salty

... scientists in Potsdam have now found out that the density and the thickness of the capsule wall, and hence its permeability, can be controlled with changes to the temperature and salt content. If the temperature is only slightly raised the hollow spheres swell up or shrink and at the same time the wall...

Researchers find that bumblebees' flower choice matters

...ed plants that are dropped in each morning and the density of each species in the plot. On any given day, Flanagan will trim the plants so that each has the same number of flowers on it. Then she tracks one bee at a time, calling out its exact foraging sequence by number to her undergraduate assistant, Dus...

Results with newer bladeless LASIK equivalent to standard microkeratome LASIK

... researchers found no difference in subbasal nerve density between types of surgery, though the density decreased after both treatments compared to density before LASIK. Corneal sensitivity did not differ...

Gene therapy prevents the onset of diabetic symptoms in mice

...thier levels. In addition, seed production and the density and size of sugar maple seedlings all increased in the few years following treatment, compared with the untreated neighboring plot. The researchers also found that the communities of mycorrhizae -- soil fungi that help provide more nutrients to pla...

Embryos exposed in 3-D

...ilter Harvest System to a traditional open-system, density gradient, centrifuge-based method for isolation of mononuclear cells (MNC) from whole blood. The Pall Filter Harvest System was found to significantly reduce processing time; it can be performed in less than 15 minutes compared to an average process...

Acid rain causing decline in sugar maples, say researchers

...thier levels. In addition, seed production and the density and size of sugar maple seedlings all increased in the few years following treatment, compared with the untreated neighboring plot. The researchers also found that the communities of mycorrhizae -- soil fungi that help provide more nutrients to pla...

New technology enables faster, more efficient cell harvest: Cell therapy meeting study

...ilter Harvest System to a traditional open-system, density gradient, centrifuge-based method for isolation of mononuclear cells (MNC) from whole blood. The Pall Filter Harvest System was found to significantly reduce processing time; it can be performed in less than 15 minutes compared to an average process...

Orange, grapefruit juice for breakfast builds bones in rats

...at improvement in the bone." "A reduction in bone density is caused when there is an increase in oxidants. In these studies, both grapefruit juice and orange juice increased antioxidants in the rats' systems," Patil said. "So that is the benefit since oxidants damage bone cells. "There are about 400 compou...

A new view on Lyme disease: Rodents hold the key to annual risk

...exposure to Lyme disease depends on the population density of infected nymphal ticks. Many studies have exami...r indexes) contributed to yearly variations in the density of infected ticks and thus risk of human exposure. While none of the climate variables influenced...

All the eggs in one basket

...ing areas of green and hawksbill turtles, and used density descriptions and harvest data to categorize "major" and "minor" nesting sites. Historically, large nesting populations existed throughout the Caribbean. The researchers estimated 59 nesting sites existed for the green turtles, and 55 sites existed...

New research: Soy germ isoflavones reduce bone loss

...g the effects of either soy or isoflavones on bone density in humans," said Mathern. "We are awaiting results of a large study, the Osteoporosis Prevention Using Soy (OPUS) study, a multi-site, two year research study on the use of soy isoflavones to prevent bone loss in 400 postmenopausal women. Both this c...

Gene therapy injected into the brains' of mice with Huntington's disease

...rovided neuroprotection in the brain, with reduced density of brain inclusions and less cell death. The authors wrote "Although GDNF's exact role in preventing cell death in mice modeled with HD remains to be established, we speculate the increase trophic support and inhibiting apoptosis (programmed cell de...

Mapping the protein world

... been implemented." ARP/wARP transforms 'electron density maps', produced in experiments that bombard protein crystals with X-rays, into 3-dimensional structures. "X-ray experiments result in 'diffraction patterns' that can't be interpreted using our eyes," Lamzin says. "These have to be reconstructed into ...

Invasive species alter habitat to their benefit

...l plots, she found that both the diversity and the density of native species were lower when litter was present. But while native plants suffered, invaders prospered. "The hybrid plants performed better with litter addition," Farrer said. "They obviously aren't hindered by the litter, and the increase in nut...

New egg freezing technique offers hope to hundreds of women

...st the EG-treated eggs changes to the amount and density of cortical granules (particles that harden the ex...rations are concerned, the reduction in amount and density of the cortical granules and the consequent hardening of the zona pellucida in frozen-thawed oocytes...

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