Group - Matter

the neutron star has a mass capital M and has a radius R. And let's assume that ...

It's one of the biggest mysteries of the universe: Dark Matter. What is it? And ...

Cosmologists are searching for dark matter in the far reaches of space and in mi...

An episode from the Open University. This one features dark matter The Open Univ...

Dr. Stephen Serjeant, senior lecturer in Astrophysics at The Open University, ex...

air. They will be stopped by air. And he knew about radio waves from Hertz and s...

Resource video for elementary science teachers based on the Ontario science curr...

A film about Dark Matter - Dr Tara Shears explains why scientists think that mos...

In this National Science Foundation program, Sean Carroll, a senior research ass...

Equal amounts of matter & antimatter were created at the birth of the universe b...

The term matter traditionally refers to the substance that all objects are made of.

"No Matter What They Say" is a song by Lil' Kim, released as the first single from her second album The Notorious K.I.

"What's The Matter With You" was a single written by Neil Finn and recorded by Split Enz for their 1980 True Colours album. The single was only released in the US and Canada, probably due to their previous single only being released in the UK, given the similar track listings.

A Matter of WHO is a 1961 British thriller film directed by Don Chaffey and starring Terry-Thomas as a World Health Organisation employee trying to trail the source of a deadly virus. It also featured Sonja Ziemann, Alex Nicol, Richard Briers, Honor Blackman and Carol White.

The End of the Matter (1977) is a science fiction novel written by Alan Dean Foster. The book is fourth chronologically in the Pip and Flinx series.

Doesn't Matter Anyway is an EP released by Savatage in 1995, in support of the song Doesn't Matter Anyway from the Dead Winter Dead album, also released in 1995.

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Abstract: Extracts of atmospheric suspended matter showed a direct mutagenic effect in the Ames test. This effect was increased by metabolic activation. These extracts were separated into an aliphatic, an aromatic and a polar fraction. The aliphatic fraction had no effect, with or without activation; the aromatic fraction showed the greatest mutagenicity with and without activation; the polar fraction was also mutagenic, but its metabolic activation did not enhance the effect. The active compounds in this last fraction could be represented in a significant part by oxygenated derivatives of polycyclic ar...

Abstract: It is known that the white matter of neocortex increases disproportionately with brain size. However, relatively few measurements have been made of white matter/gray matter scaling in the cerebellum. We present data on the volumes of white and gray matter in both structures, taken from 45 species of mammals. We find a scaling exponent of 1.13 for cerebellum and 1.28 for neocortex. The 95% confidence intervals for our estimates of these two exponents do not overlap. This difference likely reflects differences in the connectivity and/or micro-structure of white matter in the two regions.

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Abstract: Neocortex, a new and rapidly evolving brain structure in mammals, has a similar layered architecture in species over a wide range of brain sizes. Larger brains require longer fibers to communicate between distant cortical areas; the volume of the white matter that contains long axons increases disproportionally faster than the volume of the gray matter that contains cell bodies, dendrites, and axons for local information processing, according to a power law. The theoretical analysis presented here shows how this remarkable anatomical regularity might arise naturally as a consequence of the loc...

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Abstract: Digital photography of postmortem brain slices was compared with magnetic resonance imaging (MRI) for morphological analysis of human brain atrophy. In this study, we used two human brains obtained at autopsy: a cognitively defined nondemented control (70-yr-old male) and a demented Alzheimer's disease (AD) subject (82-yr-old female). For each of two brains, interactive manual image segmentation was performed by two observers on two image sets: (a) four coronal T1-weighted MR images (5 mm slices); and (b) four digitized photographic images from comparable rostrocaudal levels. Microcomputer ima...

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Abstract: Depression is one of the most frequent comorbidities occurring in Parkinson's disease, affecting up to 50% of patients. Depression is associated with severe negative symptoms and has been shown to contribute to an increased rate of decline of both cognitive and motor function, profoundly impacting on the patient's quality of life. The symptoms of depression overlap with the motor features of Parkinson's disease, making detection difficult. Moreover, the lack of specialized screening tools means that depression remains undiagnosed and untreated in a high percentage of patients. However, depress...

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Abstract: White matter (WM) and gray matter (GM) were accurately measured using a technique based on a single standardized fuzzy classifier (FC) for each tissue. Fuzzy classifier development was based on experts' visual assessments of WM and GM boundaries from a set of T1 parametric MR images. The fuzzy classifier method's accuracy was validated and optimized by a set of T1 phantom images that were based on hand-detailed human brain cryosection images. Nine sets of axial T1 images of varying thickness equally distributed throughout the brain were simulated. All T1 data sets were mapped to the standardiz...

Abstract: The targeted brain dysfunction that accompanies aging can have a devastating effect on cognitive and intellectual abilities. A significant proportion of older adults experience precipitous cognitive decline that negatively impacts functional activities. Such individuals meet clinical diagnostic criteria for dementia, which is commonly attributed to Alzheimer's disease (AD). Structural neuroimaging, including magnetic resonance imaging (MRI), has contributed significantly to our understanding of the morphological and pathology-related changes that may underlie normal and disease-associated cogn...