Spin-glass behaviour in mixed metal oxides with a rutile-type structure

We report here on the magnetic properties of compounds of composition Fe1���xCrxSbO4 and Fe1���xGaxSbO4. The introduction of paramagnetic Cr3+ and diamagnetic Ga3+ into the rutile���related iron antimonate lattice does not destroy the antisite atomic ordering which exists in iron antimonate of composition FeSbO4. The initial slope of the Curie temperature dependence on x is similar in both series, indicating that Fe3+���Cr3+ interactions are very small. The magnetic susceptibility measurements recorded from the compounds of composition Fe1���xCrxSbO4, x<0.4, and Fe0.9Ga0.1SbO4 show them to behave as spin glasses at low temperatures. The inhibition of compounds of the type Fe1���xCrxSbO4, x>0.4, and Fe1���xGaxSbO4, x>0.1 to undergo a spin���glass transition above 4.2 K is associated with a dilution effect.

Consumer Advisory Bulletin, Work-at-Home Scams: Money for Nothing, July 2012

The Attorney General���s Consumer Protection Division receives hundreds of calls and consumer complaints every year. Follow these tips to avoid unexpected expense and disappointments. This record is about: Work-at-Home Scams: Money for Nothing

Different behaviour of mouse-human chimeric antibody F(ab')2 fragments of IgG1, IgG2 and IgG4 sub-class in vivo.

Mouse-human chimeric monoclonal antibodies (MAbs) of 3 different human IgG sub-classes directed against carcinoembryonic antigen (CEA) have been produced in SP-0 cells transfected with genomic chimeric DNA. F(ab')2 fragments were obtained by pepsin digestion of the purified chimeric MAbs of human IgG1, IgG2 and IgG4 sub-class and of parental mouse MAb IgG1. The 4 F(ab')2 fragments exhibit similar molecular weight by SDS-PAGE. They were labelled with 125I or 131I and high binding (80 to 87%) to purified unsolubilized CEA was observed. In vivo, double labelling experiments indicate that the longest biological half-life and the highest tumour-localization capacity is obtained with F(ab')2 from chimeric MAb of human IgG2 sub-class, whereas F(ab')2 from chimeric MAb IgG4 give very low values for these 2 parameters. F(ab')2 from chimeric MAb IgG1 and from parental mouse MAb yield intermediate results in vivo. Our findings should help to select the appropriate human IgG sub-class to produce chimeric or reshaped MAb F(ab')2 to be used for tumour detection by immunoscintigraphy and for radioimmunotherapy.

Consumer Advisory Bulletin, Work-at-Home Scams:So You Didn���t Order That? Protecting yourself from unauthorized credit card charges, August 2012

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Consumer Advisory Bulletin, Credit Card Offers: They���re Not All the Same, October 2012

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Consumer Advisory Bulletin, Giving Wisely: A Guide to Charitable Giving and Avoiding Charity Fraud, November 2012

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Consumer Advisory Bulletin, Giving Wisely: Tips for Happier Holiday Shopping, December 2012

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Consumer Advisory Bulletin, Reverse Mortgages, January 2013

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Consumer Advisory Bulletin, Paper or Plastic? Gift Certificates & Gift Cards, February 2013

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Consumer Advisory: Auto Repairs: Going Under the Hood, April 2013

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Consumer Advisory: Buying a Used Vehicle? Don���t Get Taken for a Ride!, May 2013

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Mechanosensory interactions drive collective behaviour in Drosophila.

Collective behaviour enhances environmental sensing and decision-making in groups of animals. Experimental and theoretical investigations of schooling fish, flocking birds and human crowds have demonstrated that simple interactions between individuals can explain emergent group dynamics. These findings indicate the existence of neural circuits that support distributed behaviours, but the molecular and cellular identities of relevant sensory pathways are unknown. Here we show that Drosophila melanogaster exhibits collective responses to an aversive odour: individual flies weakly avoid the stimulus, but groups show enhanced escape reactions. Using high-resolution behavioural tracking, computational simulations, genetic perturbations, neural silencing and optogenetic activation we demonstrate that this collective odour avoidance arises from cascades of appendage touch interactions between pairs of flies. Inter-fly touch sensing and collective behaviour require the activity of distal leg mechanosensory sensilla neurons and the mechanosensory channel NOMPC. Remarkably, through these inter-fly encounters, wild-type flies can elicit avoidance behaviour in mutant animals that cannot sense the odour--a basic form of communication. Our data highlight the unexpected importance of social context in the sensory responses of a solitary species and open the door to a neural-circuit-level understanding of collective behaviour in animal groups.

Consumer Advisory: Student Loans & Loan Debt,July 2013

The Attorney General���s Consumer Protection Division receives hundreds of calls and consumer complaints every year. Follow these tips to avoid unexpected expense and disappointments. This record is about: Student Loans & Loan Debt