Super-sensitive tests could detect diseases earlier

Tuesday, May 29, 2012

Scientists have developed an ultra-sensitive test that should enable them to detect signs of a disease in its earliest stages, in research published today in the journal Nature Materials.

The scientists, from Imperial College London and the University of Vigo, have created a test to detect particular molecules that indicate the presence of disease, even when these are in very low concentrations. There are already tests available for some diseases that look for such biomarkers using biological sensors or 'biosensors'. However, existing biosensors become less sensitive and predictable at detecting biomarkers when they are in very low concentrations, as occurs when a disease is in its early stages.

In today's study, the researchers demonstrated that the new biosensor test can find a biomarker associated with prostate cancer, called Prostate Specific Antigen (PSA). However, the team say that the biosensor can be easily reconfigured to test for other diseases or viruses where the related biomarker is known.

Professor Molly Stevens, senior author of the study from the Departments of Materials and Bioengineering at Imperial College London, said:

"It is vital to detect diseases at an early stage if we want people to have the best possible outcomes - diseases are usually easier to treat at this stage, and early diagnosis can give us the chance to halt a disease before symptoms worsen. However, for many diseases, using current technology to look for early signs of disease can be like finding the proverbial needle in a haystack. Our new test can actually find that needle. We only looked at the biomarker for one disease in this study, but we're confident that the test can be adapted to identify many other diseases at an early stage."

The team demonstrated the effectiveness of their biosensor by testing PSA biomarker samples in solutions containing a complex mixture of blood derived serum proteins. Monitoring the levels of PSA at ultralow concentrations can be crucial in the early diagnosis of the reoccurrence of prostate cancer, but classic detection approaches are not sensitive enough to carry out this analysis with a high degree of accuracy. The new test could enable more reliable diagnosis, but more research will need to be done to further explore its potential.

In their study, the team detected PSA at 0.000000000000000001 grams per millilitre, which is at the limits of current biosensor performance. By comparison, an existing test called an Enzyme-Linked Immunosorbent Assay (ELISA) test can detect PSA at 0.000000001 grams per millilitre, which is nine orders of magnitude more concentrated.

The biosensors used in today's study consist of nanoscopic-sized gold stars floating in a solution containing other blood derived proteins. Attached to the surface of these gold stars are antibodies, which latch onto PSA when they detect it in a sample. A secondary antibody, which has an enzyme called glucose oxidase attached to it, recognises the PSA and creates a distinctive silver crystal coating on the gold stars, which is more apparent when the PSA biomarkers are in low concentrations. This silver coating acts like a signal that PSA is present, and it can be easily detected by scientists using optical microscopes.

The next stage of the research will see the team carrying out further clinical testing to assess the efficacy of the biosensor in detecting a range of different biomarkers associated with conditions such as HIV and other infections. They will also explore ways of commercialising their product.

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Imperial College London: http://www.imperial.ac.uk/press

Thanks to Imperial College London for this article.

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Memorial Day 2012: Honoring the fallen (Michellemalkin)

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Union-Toronto FC, Sums

First half_None.

Second half_1, Toronto FC, Koevermans 3, 88th minute.

Goalies_Philadelphia, Chris Konopka; Toronto FC, Milos Kocic.

Yellow Cards_Gaddis, Philadelphia, 11th; Pajoy, Philadelphia, 29th; Morgan, Toronto FC, 30th; De Guzman, Toronto FC, 43rd.

Referee_Juan Guzman. Assistant Referees_Brian Poeschel. Steve Taylor. 4th Official_Daniel Fitzgerald.

A_18,227 (20,000)

___

Philadelphia_Chris Konopka, Carlos Valdes, Gabriel Farfan, Sheanon Williams, Raymon Gaddis (Michael Lahoud, 37th), Michael Farfan, Kai Herdling (Antoine Hoppenot, 65th), Brian Carroll, Freddy Adu, Danny Mwanga (Josue Martinez, 83rd), Lionard Pajoy.

Toronto FC_Milos Kocic, Doneil Henry, Adrian Cann, Ashtone Morgan, Jeremy Hall, Julian De Guzman, Torsten Frings, Luis Silva (Nick Soolsma, 70th), Joao Plata (Danny Koevermans, 63rd), Ryan Johnson, Reggie Lambe (Richard Eckersley, 54th).

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Community Factors : What Might Work ? Adolescent Behavioral ...

May 29th | Adolescent Behavioral Problems

Adolescent Delinquency 425 multidimensional treatment Foster Care and violent behavior is a cost-effective alternative to incarceration or residential treatment, hospitalization and group for adolescents who have problems with chronic antisocial behavior, emotional disturbance and delinquency. Community families are recruited, trained and closely monitoring MTFC treatment and intensive assistance provide for adolescents-posted at home, at school, and in the community. Important elements of MTFC are the use of clear and consistent boundaries with follow-through on consequences, positive reinforcement for appropriate behaviors, a relationship with an adult mentoring and separation of delinquent peers. MTFC is aimed at teens with a history of chronic and serious criminal behavior at risk of imprisonment. The program highlighted to provide a structured and behaviour management methods youth therapeutic environment. Parents receive pre-service training, supervision, and run by a group program manager meetings weekly case. Additional supervision and support is also given during daily phone calls to check on youth progress and operation. During the placement maintains the youth of biological family contact with their child through guided visits and frequent contact with the MTFC case manager with respect to the progress of their child. In addition, they are also family therapy with the ultimate goal of the return of the youth back to the home. Continuity is maintained because biological parents taught are the same kind of structured behavior management system used in the MTFC. Other important contacts are maintained between the MTFC case manager and teachers, probation officers and other key figures in the life of the youth. Evaluations of MTFC have shown that youth programme in comparison with the control group of youth spend less restrictive placements faster resigned, on 12-month follow-up days locked up, and have fewer subsequent arrests.

Related posts:

1. Community Factors : Serious Juvenile Offenders ? Adolescent Behavioral Problems
2. Community Factors : Adolescent Delinquency ? Adolescent Behavioral Problems
3. Protective Factors : Another Community Level Risk Factor ? Adolescent Behavioral Problems
4. Community Factors : What Works ? Adolescent Behavioral Problems
5. Peer Associations : What Might Work ? Adolescent Behavioral Problems

Tags: community, factors

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GOP ties Obama to NH student debt, ignores origins (The Arizona Republic)

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Microsoft talks more on Windows 8 apps in the background

A few days ago, Microsoft posted up a new entry in its Windows 8 app developer block on how Windows 8 Metro apps can be coded to perform tasks while still running in the background of the OS. This week, the company posted up a new entry in the blog that offers up two examples of how background running apps can still be productive.

One example discussed was allowing background apps to run and accomplish tasks while a Windows 8 device is plugged into a power outlet, rather than running on battery power. Microsoft said that Windows 8 app developers can put in this kind of feature using what is called a maintenance trigger. The post explains:

The maintenance trigger is available to everyone and your app doesn?t need to be on the lock screen. The advantage of using a maintenance trigger background task is that it is guaranteed to not interfere with the user?s activity and, runs only on AC power. So you don?t need to worry about excessive battery usage.

Some example code is put into the blog on how to code in this maintenance trigger.

Yet another example is offering to give app users a way to give Windows 8 apps permission to run in the background while also appearing on the lock screen. The blog states:

This is a natural fit because the lock screen is designed to provide users info about their apps without the need for them to unlock their Windows 8 device. This relationship is a two-way street: your app can use these types of background tasks only if it is on the lock screen and, likewise, your app can appear on the lock screen only if it requests to use these types of background tasks.

Apps that might be a good fit for lock screen permissions include email clients which can show a number of unread emails to the user. Again, the blog offers up some example code to developers to show how a background running email app can download new emails from a POP account every 15 minutes. The blog also goes into some detail about how background apps do still have some CPU and network resource usage constraints and goes over those specific limits.

Source: Microsoft | Image via Microsoft

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Paris Club Agree To Debt Restructuring Deal

The Federation Struggles With Debt

Basseterre, St. Kitts ? Nevis
May 25, 2012 (CUOPM)

A Government delegation led by Prime Minister and Minister of Finance, the Rt. Hon Dr. Denzil L. Douglas, has secured a landmark ?stock-of-debt? restructuring deal from Paris Club creditors after an intense negotiation session held in Paris, France on 24th May 2012.

The discussions with the Paris Club were focused on how best to support the Government?s bold economic transformation efforts through the restructuring of the debts owed by St. Kitts and Nevis to the United Kingdom and the United States. The approach to the Paris Club was part of the comprehensive debt restructuring program launched by the Government in June 2011.

After six rounds of complex negotiations, the Government and the Paris Club agreed at the multilateral level to restructure over 20 years the entire stock of debt outstanding to the Paris Club, including the arrears. A grace period on principal repayments of seven years will also apply. Concessional rates of interest will apply to the rescheduling.

In addition, the Paris Club confirmed during the negotiations that further concessions from the Paris Club creditors at the bilateral level are likely. The Government expects that these concessions could involve the outright cancellation of over 60% of the debt treated at the multilateral level on 24 May 2012, as well as other additional concessions.

During the negotiations the Paris Club saluted the outstanding results of the Government?s economic reform drive and general debt restructuring effort to date. The Club?s members, who include representatives from the world?s developed economies, acknowledged that the Government?s determination to tackle the country?s problems in a decisive way will help ensure that St. Kitts and Nevis is well placed to withstand the headwinds of an increasingly uncertain international environment.

The Paris Club also indicated that it was the Government?s commitment to a sound macroeconomic course, as well as the approach taken with the general debt restructuring, that persuaded the group to grant restructuring terms that are exceptional for a country in the upper-middle income category.

Speaking after the signing of the Agreed Minutes, Prime Minister Douglas commented: ?We understand that the negotiations were tougher and took a little longer than the Paris Club had expected. This may be the case, but it was important for us to have the opportunity to explain our situation properly, and to secure the right agreement for us.?

The Prime Minister added, ?Even before we take into account the additional concessions from our creditors that are expected to come at the bilateral level, the agreement signed in Paris yesterday has no precedent in the Caribbean, and is amongst the most concessional ever to have been granted by the Paris Club to an upper-middle income country anywhere in the world. We are delighted at this recognition of our efforts, and thank the Paris Club for its support.?

The Prime Minister was accompanied during the negotiations by Mrs. Janet Harris, Financial Secretary at the Ministry of Finance, and by the financial advisors from White Oak Advisory LLP.

The bilateral agreements that will implement the 24 May 2012 agreement, and that are expected to incorporate the additional concessions, are scheduled to be signed later this year.

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