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Tag: "observed" at biology news

Penn researchers study the use of ultrasound for treatment of cancer

...otherapy ultrasound (about 2.5 watts), researchers observed that the tumors had little or no blood supply. "W... wanted to study this use of ultrasound because we observed that some of these newly formed vessels created by tumors are very weak in nature, and if you turn o...

Nano springs eternal; Protozoan 'engine' posts nano records

...first described the workings of a nano machine. He observed the rapid contraction of a stalk tethering the cell body of a tiny protozoan, Vorticella convallaria, to the surface of a leaf. Little did van Leeuwenhoek imagine that more than 300 years later, the biological spring that drives Vorticella would set ...

Are U.S. Flu Death Figures More PR Than Science?

...first described the workings of a nano machine. He observed the rapid contraction of a stalk tethering the cell body of a tiny protozoan, Vorticella convallaria, to the surface of a leaf. Little did van Leeuwenhoek imagine that more than 300 years later, the biological spring that drives Vorticella would set ...

Similar Stem Cells In Insect And Human Gut

...first described the workings of a nano machine. He observed the rapid contraction of a stalk tethering the cell body of a tiny protozoan, Vorticella convallaria, to the surface of a leaf. Little did van Leeuwenhoek imagine that more than 300 years later, the biological spring that drives Vorticella would set ...

Twin molecular scissors link creation of microRNAs with gene-silencing

...small molecules called microRNAs, or miRNAs. First observed only a few years ago, these molecules appear to inactivate messenger RNA, itself responsible for translating genes into proteins. Scientists have been eager to know more about miRNAs, clearly important players on the genetic field despite having gone...

UCLA imaging study of children with autism finds broken mirror neuron system

...ror neuron system may underlie the social deficits observed in autism," said Mirella Dapretto, lead author and...oning children with autism while they imitated and observed 80 photos depicting different emotions such as anger, fear, happiness or sadness. In addition, the b...

Human trial proves ricin vaccine safe, induces neutralizing antibodies; further tests planned

...rator on the study. Based on the protection they observed in the mice injected with ricin mixed with human-produced antibodies, the researchers projected that a RiVax-vaccinated human could withstand a lethal dose of injected ricin. According to the Centers for Disease Control and Prevention, such a dose fo...

UCSD study finds anthrax toxins also harmful to fruit flies

...l factor toxin to fruit fly embryos and larvae and observed that a component of the expected signaling pathway was inactivated, disrupting the whole molecular system and leading to death. When applied in a more limited fashion, LF interfered with the formation of sutures in the epidermis, resulting in a hole ...

Stem cell mobilization therapy appears to be ineffective in repairing damage caused by heart attack

...ter treatment) or major adverse cardiac events was observed with G-CSF treatment," the authors write. "The REVIVAL-2 trial had a cohort that was larger than all 3 previous trials taken together and had a relatively long follow-up period based on sensitive assessment methods of left ventricular function and i...

Frog’s ear canal may provide insights for understanding human hearing loss

... audible components and ultrasonic components, and observed the responses of eight A. tormotus males to each of the split sounds. Five of the eight frogs produced calls in response to the audible, ultrasonic or both components of the species call, and three did not. Results of the behavioral observations show...

Carnegie Mellon develops non-invasive technique to detect transplant rejection at cellular level

..." said Ho. "Up to now, this phenomenon hasn't been observed in pre-clinical or clinical research because biopsy samples are very limited in location and size." The reported findings also have broader implications for biology and medicine, according to Ho. "We now have the ability to visualize non-invasively...

Infants can organise visual information at just four months

... that grouping by brightness emerges first: it was observed at two months, in line with previous observations ...ume that the same patterns of performance would be observed in children", says Dr Farran. "But often there are quite different patterns. In cognitive developmen...

Cortex matures faster in youth with highest IQ

... related to the dynamics of cortex maturation."The observed differences are consistent with findings from functional magnetic resonance imaging, showing that levels of activation in prefrontal areas correlates with IQ, note the researchers. They suggest that the prolonged thickening of prefrontal cortex in ch...

New discovery: Molecular variation in one gene affects the growth of natural populations

...significance for population growth. It has been observed in previous studies on the Glanville fritillary and Colias butterflies that the individuals' Pgi genotype affects their flight metabolic rate and reproductive performance. The present result proves that these differences between individuals also hav...

Carnegie Mellon scientists show brain uses optimal code for sound

... sounds, they corresponded exactly to the patterns observed by neurophysiologists in the auditory nerves. "We've found that timing of just a sparse number of spikes actually encodes the whole range of nature sounds, including components of speech such as vowels and consonants, and natural environment sounds ...

UW scientists unravel critical genetic puzzle for flu virus replication

...e virus and its virions. The virus particles, when observed as a cross section, always displayed the circle of seven RNA fragments surrounding another segment pattern. "No one has identified this before, perhaps because no one has ever tried to make serial sections of the virus." ...

Learning and memory stimulated by gut hormone

...mp; Reproductive Sciences, and Neurobiology, first observed that peripheral ghrelin can enter the hippocampus and bind to local neurons promoting alterations in connections between nerve cells in mice and rats. Further study of behavior in the animals showed that these changes in brain circuitry are linked to...

Genetic and environmental influences on alcohol consumption among rhesus monkeys

...es that additive genetic factors contribute to the observed inter-individual variation in the consumption of alcohol in rhesus," said Lorenz. The term "additive genetic factors" refers to that portion of total genetic effects that is solely due to the presence or absence of a gene's given alleles. For examp...

Researchers reverse juvenile diabetes in animal model

...rs Massimo Trucco, MD, and Nick Giannoukakis, PhD, observed marked amelioration of diabetes in a mouse model by a novel treatment strategy involving specific modification of the animal's own dendritic cells, thereby reversing diabetes in animal studies. The U.S. Food and Drug Administration (FDA) approved th...

Pleasing plant shapes explained by new computer model

...This creates the striking spiral patterns of seeds observed in sunflowers, daisies, and many other plants. Other patterns, such as branching at right angles observed in lilac branching, can be also be simulated using different parameter values. The subject of the s...

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