Posts Tagged ‘Michael Berger’

Nanotechnology and the US mega science project: BAM (Brain Activity Map) and more

Tuesday, April 2nd, 2013

The Brain Activity Map (BAM) project received budgetary approval as of this morning, Apr. 2, 2013 (I first mentioned BAM in my Mar. 4, 2013 posting when approval seemed imminent). From the news item, Obama Announces Huge Brain-Mapping Project, written by Stephanie Pappas for Yahoo News (Note: Links have been removed),

 President Barack Obama announced a new research initiative this morning (April 2) to map the human brain, a project that will launch with $100 million in funding in 2014.

The Brain Activity Map (BAM) project, as it is called, has been in the planning stages for some time. In the June 2012 issue of the journal Neuron, six scientists outlined broad proposals for developing non-invasive sensors and methods to experiment on single cells in neural networks. This February, President Obama made a vague reference to the project in his State of the Union address, mentioning that it could “unlock the answers to Alzheimer’s.”

In March, the project’s visionaries outlined their final goals in the journal Science. They call for an extended effort, lasting several years, to develop tools for monitoring up to a million neurons at a time. The end goal is to understand how brain networks function.

“It could enable neuroscience to really get to the nitty-gritty of brain circuits, which is the piece that’s been missing from the puzzle,” Rafael Yuste, the co-director of the Kavli Institute for Brain Circuits at Columbia University, who is part of the group spearheading the project, told LiveScience in March. “The reason it’s been missing is because we haven’t had the techniques, the tools.” [Inside the Brain: A Journey Through Time]

Not all neuroscientists support the project, however, with some arguing that it lacks clear goals and may cannibalize funds for other brain research.

….

I believe the $100M mentioned for 2014 would one installment in a series totaling up to $1B or more. In any event, it seems like a timely moment to comment on the communications campaign that has been waged on behalf of the BAM. It reminds me a little of the campaign for graphene, which was waged in the build up to the decision as to which two projects (in a field of six semi-finalists, then narrowed to a field of four finalists) should receive a FET (European Union’s Future and Emerging Technology) 1 billion euro research prize each. It seemed to me even a year or so before the decision that graphene’s win was a foregone conclusion but the organizers left nothing to chance and were relentless in their pursuit of attention and media coverage in the buildup to the final decision.

The most recent salvo in the BAM campaign was an attempt to link it with nanotechnology. A shrewd move given that the US has spent well over $1B since the US National Nanotechnology Initiative (NNI) was first approved in 2000. Linking the two projects means the NNI can lend a little authority to the new project (subtext: we’ve supported a mega-project before and that was successful) while the new project BAM can imbue the ageing NNI with some excitement.

Here’s more about nanotechnology and BAM from a Mar. 27, 2013 Spotlight article by Michael Berger on Nanowerk,

A comprehensive understanding of the brain remains an elusive, distant frontier. To arrive at a general theory of brain function would be an historic event, comparable to inferring quantum theory from huge sets of complex spectra and inferring evolutionary theory from vast biological field work. You might have heard about the proposed Brain Activity Map – a project that, like the Human Genome Project, will tap the hive mind of experts to make headway in the understanding of the field. Engineers and nanotechnologists will be needed to help build ever smaller devices for measuring the activity of individual neurons and, later, to control how those neurons function. Computer scientists will be called upon to develop methods for storing and analyzing the vast quantities of imaging and physiological data, and for creating virtual models for studying brain function. Neuroscientists will provide critical biological expertise to guide the research and interpret the results.

Berger goes on to highlight some of the ways nanotechnology-enabled devices could contribute to the effort. He draws heavily on a study published Mar. 20, 2013 online in ACS (American Chemical Society)Nano. Shockingly, the article is open access. Given that this is the first time I’ve come across an open access article in any of the American Chemical Society’s journals, I suspect that there was payment of some kind involved to make this information freely available. (The practice of allowing researchers to pay more in order to guarantee open access to their research in journals that also have articles behind paywalls seems to be in the process of becoming more common.)

Here’s a citation and a link to the article about nanotechnology and BAM,

Nanotools for Neuroscience and Brain Activity Mapping by A. Paul Alivisatos, Anne M. Andrews, Edward S. Boyden, Miyoung Chun, George M. Church, Karl Deisseroth, John P. Donoghue, Scott E. Fraser, Jennifer Lippincott-Schwartz, Loren L. Looger, Sotiris Masmanidis, Paul L. McEuen, Arto V. Nurmikko, Hongkun Park, Darcy S. Peterka, Clay Reid, Michael L. Roukes, Axel Scherer, Mark Schnitzer, Terrence J. Sejnowski, Kenneth L. Shepard, Doris Tsao, Gina Turrigiano, Paul S. Weiss, Chris Xu, Rafael Yuste, and Xiaowei Zhuang. ACS Nano, 2013, 7 (3), pp 1850–1866 DOI: 10.1021/nn4012847 Publication Date (Web): March 20, 2013
Copyright © 2013 American Chemical Society

As these things go, it’s a readable article for people without a neuroscience education provided they don’t mind feeling a little confused from time to time. From Nanotools for Neuroscience and Brain Activity Mapping (Note: Footnotes and links removed),

The Brain Activity Mapping (BAM) Project (…) has three goals in terms of building tools for neuroscience capable of (…) measuring the activity of large sets of neurons in complex brain circuits, (…) computationally analyzing and modeling these brain circuits, and (…) testing these models by manipulating the activities of chosen sets of neurons in these brain circuits.

As described below, many different approaches can, and likely will, be taken to achieve these goals as neural circuits of increasing size and complexity are studied and probed.

The BAM project will focus both on dynamic voltage activity and on chemical neurotransmission. With an estimated 85 billion neurons, 100 trillion synapses, and 100 chemical neurotransmitters in the human brain,(…) this is a daunting task. Thus, the BAM project will start with model organisms, neural circuits (vide infra), and small subsets of specific neural circuits in humans.

Among the approaches that show promise for the required dynamic, parallel measurements are optical and electro-optical methods that can be used to sense neural cell activity such as Ca2+,(7) voltage,(…) and (already some) neurotransmitters;(…) electrophysiological approaches that sense voltages and some electrochemically active neurotransmitters;(…) next-generation photonics-based probes with multifunctional capabilities;(18) synthetic biology approaches for recording histories of function;(…) and nanoelectronic measurements of voltage and local brain chemistry.(…) We anticipate that tools developed will also be applied to glia and more broadly to nanoscale and microscale monitoring of metabolic processes.

Entirely new tools will ultimately be required both to study neurons and neural circuits with minimal perturbation and to study the human brain. These tools might include “smart”, active nanoscale devices embedded within the brain that report on neural circuit activity wirelessly and/or entirely new modalities of remote sensing of neural circuit dynamics from outside the body. Remarkable advances in nanoscience and nanotechnology thus have key roles to play in transduction, reporting, power, and communications.

One of the ultimate goals of the BAM project is that the knowledge acquired and tools developed will prove useful in the intervention and treatment of a wide variety of diseases of the brain, including depression, epilepsy, Parkinson’s, schizophrenia, and others. We note that tens of thousands of patients have already been treated with invasive (i.e., through the skull) treatments. [emphases mine] While we hope to reduce the need for such measures, greatly improved and more robust interfaces to the brain would impact effectiveness and longevity where such treatments remain necessary.

Perhaps not so coincidentally, there was this Mar. 29, 2013 news item on Nanowerk,

Some human cells forget to empty their trash bins, and when the garbage piles up, it can lead to Parkinson’s disease and other genetic and age-related disorders. Scientists don’t yet understand why this happens, and Rice University engineering researcher Laura Segatori is hoping to change that, thanks to a prestigious five-year CAREER Award from the National Science Foundation (NSF).

Segatori, Rice’s T.N. Law Assistant Professor of Chemical and Biomolecular Engineering and assistant professor of bioengineering and of biochemistry and cell biology, will use her CAREER grant to create a toolkit for probing the workings of the cellular processes that lead to accumulation of waste material and development of diseases, such as Parkinson’s and lysosomal storage disorders. Each tool in the kit will be a nanoparticle — a speck of matter about the size of a virus — with a specific shape, size and charge.  [emphases mine] By tailoring each of these properties, Segatori’s team will create a series of specialized probes that can undercover the workings of a cellular process called autophagy.

“Eventually, once we understand how to design a nanoparticle to activate autophagy, we will use it as a tool to learn more about the autophagic process itself because there are still many question marks in biology regarding how this pathway works,” Segatori said. “It’s not completely clear how it is regulated. It seems that excessive autophagy may activate cell death, but it’s not yet clear. In short, we are looking for more than therapeutic applications. We are also hoping to use these nanoparticles as tools to study the basic science of autophagy.”

There is no direct reference to BAM but there are some intriguing correspondences.

Finally, there is no mention of nanotechnology in this radio broadcast/podcast and transcript but it does provide more information about BAM (for many folks this was first time they’d heard about the project) and the hopes and concerns this project raises while linking it to the Human Genome Project. From the Mar. 31, 2013 posting of a transcript and radio (Kera News; a National Public Radio station) podcast titled, Somewhere Over the Rainbow: The Journey to Map the Human Brain,

During the State of the Union, President Obama said the nation is about to embark on an ambitious project: to examine the human brain and create a road map to the trillions of connections that make it work.

“Every dollar we invested to map the human genome returned $140 to our economy — every dollar,” the president said. “Today, our scientists are mapping the human brain to unlock the answers to Alzheimer’s.”

Details of the project have slowly been leaking out: $3 billion, 10 years of research and hundreds of scientists. The National Institutes of Health is calling it the Brain Activity Map.

Obama isn’t the first to tout the benefits of a huge government science project. But can these projects really deliver? And what is mapping the human brain really going to get us?

Whether one wants to call it a public relations campaign or a marketing campaign is irrelevant. Science does not take place in an environment where data and projects are considered dispassionately. Enormous amounts of money are spent to sway public opinion and policymakers’ decisions.

ETA Ap. 3, 2013: Here are more stories about BAM and the announcement:

BRAIN Initiative Launched to Unlock Mysteries of Human Mind

Obama’s BRAIN Only 1/13 The Size Of Europe’s

BRAIN Initiative Builds on Efforts of Leading Neuroscientists and Nanotechnologists

Flesh-eating fungus, ivy and other inspirations from nature

Monday, January 7th, 2013

Michael Berger has featured Dr. Mingjun Zhang’s team’s fascinating work on flesh-eating fungus in a Dec. 18, 2012 Spotlight article on Nanowerk,

“Most studies on naturally occurring organic nanoparticles have focused on higher organisms,” Mingjun Zhang, an associate professor of biomedical engineering at the University of Tennessee, Knoxville, tells Nanowerk. “Given the earth’s rich biological diversity, it is reasonable to hypothesize that naturally occurring nanoparticles, of various forms and functions, may be produced by a wide range of organisms from microbes to metazoans.”

In his research, Zhang has focused on looking at nature for inspirations for solutions to challenges in engineering and medicine, especially in small-scale, such as bioinspired nanomaterials, bioinspired energy-efficient propulsive systems, and bioinspired nanobio systems for interfacing with cellular systems.

In new work, Zhang and his research associate Dr. Yongzhong Wang have turned their focus to Arthrobotrys oligospora, a representative flesh eater with a predatory life stage in the fungal kingdom.

The researchers have published their work in Advanced Functional Materials ((early online publication behind a paywall),

Naturally Occurring Nanoparticles from Arthrobotrys oligospora as a Potential Immunostimulatory and Antitumor Agent by Yongzhong Wang, Leming Sun, Sijia Yi, Yujian Huang, Scott C. Lenaghan, and Mingjun Zhang in Advanced Functional Materials

Article first published online: 4 DEC 2012 DOI: 10.1002/adfm.201202619

Here’s the abstract,

Arthrobotrys oligospora, a representative flesh eater in the fungal kingdom, is a potential source for natural-based biomaterials due to the presence of specialized 3D adhesive traps that can capture, penetrate, and digest free-living nematodes in diverse environments. The purpose of this study is to discover novel nanoparticles that occur naturally in A. oligospora and to exploit its potential biomedical applications. A new culture method, fungal sitting drop culture method, is established in order to monitor the growth of A. oligospora in situ, and observe the nanoparticle production without interfering or contamination from the solid media. Abundant spherical nanoparticles secreted from the fungus are first revealed by scanning electron microscopy and atomic force microscopy. They have an average size of 360–370 nm, with a zeta potential of –33 mV at pH 6.0. Further analyses reveal that there is ≈28 μg of glycosaminoglycan and ≈550 μg of protein per mg of nanoparticles. Interestingly, the nanoparticles significantly induce TNF-α secretion in RAW264.7mouse macrophages, indicating a potential immunostimulatory effect. The nanoparticles themselves are also found slightly cytotoxic to mouse melanoma B16BL6 and human lung cancer A549 cells, and show a synergistic cytotoxic effect upon conjugation with doxorubicin against both cells. This study proposes a new approach for producing novel organic nanoparticles secreted from microorganisms under controlled conditions. The findings here also highlight the potential roles of the naturally occurring nanoparticles from A. oligospora as an immunostimulatory and antitumor agent for cancer immunochemotherapy.

In more generalized language (from Berger’s Spotlight article),

“It is really exciting to use a natural microbe system to produce nanoparticles for potential cancer therapy,” says Zhang. “Originally, we were trying to understand how the fungus secretes an adhesive trap that can capture, penetrate, and digest free-living nematodes in diverse environments. By doing that we almost accidentally discovered the nanoparticles produced.”

Zhang’s team investigated the fungal nanoparticles’ potential as a stimulant for the immune system, and found through an in vitro study that the nanoparticles activate secretion of an immune-system stimulant within a white blood cell line. They also investigated the nanoparticles’ potential as an antitumor agent by testing in vitro the toxicity to cells using two tumor cell lines, and discovered nanoparticles do kill cancer cells.

Berger’s article in addition to giving more details about Zhang’s current work and his work with ivy and possible applications for ivy-based nanoparticles in sunscreens also provides some discussion of naturally occurring nanoparticles as opposed to engineered (or man-made)  nanoparticles.

The University of Tennessee’s Dec. 4, 2012 press release is also a good source of information on Zhang’s latest work on flesh-eating fungus. For the indefatiguable who are interested in Zhang’s work on ivy and potential nanosunscreens, there’s also my July 22, 2010 posting.

American National Standards Institute’s (ANSI) nanotechnology standards panel to meet in Februrary 2013 and one more standard

Thursday, December 20th, 2012

The American National Standards Institute’s (ANSI) Nanotechnology Standards Panel (NSP) was scheduled to meet in Oct. 2012 but Hurricane Sandy, which hit the eastern part of the continent at that time, necessitated rescheduling to Feb. 4, 2013 as per the Dec. 20, 2012 posting on Thomas.net,

Originally scheduled for October 30, 2012, ANSI’s Nanotechnology Standards Panel meeting was postponed as a result of Hurricane Sandy and will now be held on February 4, 2013. Meeting will examine how current nanotechnology standards are being utilized and how standards activities meet existing stakeholder needs. Benefits of participating in nanotechnology standardization and the possibilities for greater collaboration between stakeholders in this area will also be discussed.

The Dec. 14, 2012 ANSI news release provides more details about the Feb. 4, 2012 meeting to be held in Washington, DC,

The half-day meeting will examine how current nanotechnology standards are being utilized and how standards activities meet existing stakeholder needs. The benefits for companies, organizations, and other groups to participate in nanotechnology standardization and the possibilities for greater collaboration between stakeholders in this area will also be discussed.

Formed in 2004, ANSI’s NSP serves as the cross-sector coordinating body for the facilitation of standards development in the area of nanotechnology. Shaun Clancy, Ph.D., the director of product regulatory services for the Evonik Degussa Corporation, and Ajit Jilavenkatesa, Ph.D., the senior standards policy advisor for the National Institute of Science and Technology (NIST) of the U.S. Department of Commerce (DoC), serve as the ANSI-NSP’s co-chairs.

… The ANSI-NSP works to provide a forum for standards developing organizations (SDOs), government entities, academia, and industry to identify needs and establish recommendations for the creation or updating of standards related to nanotechnology and nanomaterials. In addition, the ANSI-NSP solicits participation from nanotechnology-related groups that have not traditionally been involved in the voluntary consensus standards system, while also promoting cross-sector collaborative efforts.

Attendance at the February meeting is free. All attendees are required to register here for the meeting; individuals who registered for the October 2012 event must register again. [emphasis mine] For more information, visit the ANSI-NSP webpage or contact Heather Benko (hbenko@ansi.org), ANSI senior manager, nanotechnology standardization activities.

Standardization is one of the topics highlighted in Michael Berger’s Dec. 20, 2012 Nanowerk Spotlight article about environmental health and safety and a high-throughput screening (HTS) platform developed at the University of California’s Center for Environmental Implications of Nanotechnology (CEIN) that can perform toxicity screening of 24 metal oxide nanoparticles simultaneously,

According to the team, the HTS platform that has been demonstrated in this study could easily be adapted to study other nanomaterials of interest. The capability of HTS would also allow researchers to analyze multiple samples at different concentrations, time points, as well as varying experimental parameters – all in one setup. The standardization of the whole screening process by this HTS platform also minimizes human intervention and errors during the experiment.

I guess it’s the season for standardization. Ho, ho, ho!

Psychedelic illustration for a nanobioelectronic tongue

Tuesday, December 18th, 2012
A human tongue-like nanobioelectronic tongue. Illustration of the hTAS2R38-fucntionalized carboxylated polypyrrole nanotube. (Image: Dr. Park, Seoul National University)

A human tongue-like nanobioelectronic tongue. Illustration of the hTAS2R38-fucntionalized carboxylated polypyrrole nanotube. (Image: Dr. Park, Seoul National University)

This illustration accompanies a Dec. 14, 2012 Nanowerk Spotlight article by Michael Berger about the development of a nanobioelectronic tongue by Korean researchers (Note: I have removed links),

The concept of e-noses – electronic devices which mimic the olfactory systems of mammals and insects – is very intriguing to researchers involved in building better, cheaper and smaller sensor devices (read more: “Nanotechnology electronic noses”). Less well known is the fact that equivalent artificial sensors for taste – electronic tongues – are capable of recognizing dissolved substances (see for instance: “Electronic tongue identifies cava wines”).

“Even with current technological advances, e-tongue approaches still cannot mimic the biological features of the human tongue with regard to identifying elusive analytes in complex mixtures, such as food and beverage products,” Tai Hyun Park, a professor in the School of Chemical and Biological Engineering at Seoul National University, tells Nanowerk.

Park, together with Professor Jyongsik Jang and their collaborators, have now developed a human bitter-taste receptor as a nanobioelectronic tongue.

The team worked with a protein to develop the ‘tongue’,

The nanobioelectronic tongue uses a human taste receptor as a recognition element and a conducting polymer nanotube field effect transistor (FET) sensor as a sensor platform. Specifically, the Korean team functionalized carboxylated polypyrrole nanotubes with the human bitter taste receptor protein hTAS2R38. They say that the fabricated device could detect target bitter tastants with a detection limit of 1 femtomole and high selectivity.

“In the case of bitter taste, our nanobioelectronic tongue can be used for sensing quantitatively the bitter taste, for example, of coffee, chocolate drinks, drugs and oriental medicines,” says Park. “Our nanobioelectronic tongue can be used as an alternative to time-consuming and labor-intensive sensory evaluations and cell-based assays for the assessment of quality, tastant screening and basic research on the human taste system.”

Prachi Patel’s ??? 2012 article about the research for Chemical and Engineering News (C&EN) provides more technical details about the testing,

The researchers tested their device’s response to four bitter compounds: phenylthiocarbamide, propylthiouracil, goitrin, and isothiocyanate. When these compounds bound to the protein-coated nanotubes, the researchers noted, the current through the transistors changed. For solutions of phenylthiocarbamide and propylthiouracil in buffer, the researchers could detect concentrations of 1 and 10 femtomolar, respectively. The device could sense goitrin and isothiocyanate, which are found in cruciferous vegetables, at picomolar concentrations in samples taken from vegetables such as cabbage, broccoli, and kale.

The team also tested the sensor’s response to mixtures of bitter, sweet, and umami (or savory) flavor molecules. The device responded only when the bitter compounds were present in the mixtures, even at femtomolar concentrations. Park says that the researchers are now trying to make sensors for sweet and umami tastes by using human taste receptors that respond to those flavors.

Here’s a citation (not an official one) and a link to the researchers’ paper,

Human Taste Receptor-Functionalized Field Effect Transistor as a Human-Like Nanobioelectronic Tongue by Hyun Seok Song, Oh Seok Kwon, Sang Hun Lee, Seon Joo Park, Un-Kyung Kim, Jyongsik Jang, and Tai Hyun Park in Nano Lett., Article ASAP DOI: 10.1021/nl3038147 Publication Date (Web): November 26, 2012 Copyright © 2012 American Chemical Society

Access to the full article is behind a paywall.

Nanotechnology scene in China

Monday, December 10th, 2012

There was a Dec. 5, 2012 Nanowerk Spotlight article by Michael Berger which focused on a review (Engineering Small Worlds in a Big Society: Assessing the Early Impacts of Nanotechnology in China [behind a paywall]) in a special issue of the Wiley journal, Policy Review. It seems timely given today’s (Dec. 10, 2012) earlier posting (Wanxiang America wins bid for most of A123 Systems’ assets) about a China-based company’s successful bid for a bankrupt US company that produced Li-ion (lithium-ion) batteries.

From Berger’s Dec. 5, 2012 article (Note: I have removed links),

A recent review (“Engineering Small Worlds in a Big Society: Assessing the Early Impacts of Nanotechnology in China”) analyzes the early impacts of nanotechnology on China’s economic and innovation development in six key areas. It concludes that the country’s effort to join the world leaders in nanoscale R&D has made significant progress. Although several effects are difficult to capture, cross-country and cross-regional collaborations, institutional development, regional spread, industrial and enterprise development, as well as research and education capabilities, have been influenced positively by the new programs in China’s nanotechnology initiative.

However, it seems difficult to estimate the role of particular policies in this process; in other words, what is the specific contribution of nanotechnology programs relative to the entire complex of new initiatives aimed at promoting indigenous innovation in China. The authors – Evgeny A. Klochikhin and Philip Shapira from the Manchester Institute for Innovation Research – find that nanotechnology policies are contributing to addressing existing innovation systems lock-ins and historical path dependencies in China.

In spite of that, many challenges remain, including those of separation of research and training, uneven distribution of science and technology across regions, poor mechanisms of technology transfer, and challenges for independent science-driven entrepreneurial development.

Berger’s article (illustrated with diagrams) lists six key areas assessed by Klochikhin and Shapira,

… [1] institutional development, knowledge flows, and network efficiency; [2] research and education capabilities; [3] industrial and enterprise growth; [4] regional spread; [5] cluster and network development; and [6] product innovation. They caution, though, that these areas do not cover the entire spectrum of the social and economic effects of a given technology on individual nations but can be used as a model for an initial estimate of such effects.

Berger’s and Klochikhin’s and Shapira’s articles come as no surprise given the intense interest in China. A Nov. 9, 2012 posting about the recent S.NET (Society for the Study of Nanoscience and Emerging Technologies) 2012 conference highlighted a presentation by Denis Simon at a conference panel titled, Will China’s effort to become a high-tech innovator succeed? If you go to the conference presentations webpage and scroll down to the Weds., Oct. 24, 2012  9 am – 10:30 am slot, you can download one or all of the presentations from that session.

ETA Dec. 10, 2012 1330 PST: Philip Shapira has been mentioned here before, most recently in March 29, 2012 posting about nanotechnology’s economic impacts and lifecycle assessments.

Liquid solar blocker from Ontario’s Hy-Power Nano

Tuesday, September 4th, 2012

Hy-Power Nano, mentioned in my Aug. 15, 2012 posting, has announced its first nanotechnology-enabled product and it’s a coating product for windows. From the Sept. 3, 2012 news item by Will Soutter item on Azonano,

Hy-Power Nano, the subsidiary of South Ontario-based [Canada] Hy-Power Coatings, engaged in developing nanocoating products characterized by thermal insulation and a solar blocking capability has introduced its first product labeled the Hy-Power Clear Liquid Solar Blocker.

The launch of the solar blocker represents a significant milestone in the company’s endeavors towards the development of nanotechnology-based coating products. The product was demonstrated in Mississauga at the International Conference Centre to a group of customers. The product is the output of two-and-a-half years of labor initiated after Hy-Power Nano President and CEO, Joseph Grzyb, envisaged the potential of leveraging their 46 years of expertise in industrial coating in combination with nanotechnology.

Hy-Power Nano’s Aug. 31, 2012 product announcement offers this comment from the company’s president, Joseph Grzyb,

“While we all love sunlight, ultraviolet (UV) rays can be damaging and infrared (IR) rays are a source of energy costs,” says Joseph Grzyb, President and CEO of Hy-Power Nano. “Our Clear Liquid Solar Blocker is so clear you can’t see it on glass, yet it blocks 99.99 per cent of UV and 40 per cent of infrared rays. Since the product is liquid-based, it can be applied on a variety of glass surfaces and geometries.”

“There are many applications for this product. For example, for retailers, that means products in windows won’t fade from sunlight while allowing customers a completely unobstructed view of the goods in the window. Skylights coated with our product allow people to enjoy the comfort and natural light without any negative impacts. There are actually quite a range of needs addressed by this product,” adds Grzyb.

There’s a lot of research interest in windows these days and it’s not just in Canada. This Aug. 27, 2012 Nanowerk Spotlight essay by Michael Berger offers an overview of some of the latest work,

Buildings and other man-made structures consume as much as 30-40% of the primary energy in the world, mainly for heating, cooling, ventilation, and lighting. In particular, air conditioners are responsible for a large proportion of the energy usage in the US: 13% in 2006 and 10% in 2020 (projected) of the total primary energy. Air conditioning in China is 40-60% of a building’s energy consumption (the exact figure depends on the area of the building), and overall, accounts for 30% of the total primary energy available. These figures will grow very rapidly with urbanization development.

“Smart window” is a term that refers to a glass window that allows intelligent control of the amount of light and heat passing though. This control is made possible by an external stimulus such as electrical field (electrochromic), temperature (thermochromic), ultraviolet irradiation (photochromic) and reductive or oxidizing gases (gasochromic). These technologies save energy, address CO2 concerns, improve comfort levels, and have economic benefits.

One of these days I’d like to see a study or two about the occupational health and safety issues for people who produce and apply coatings such as this one from Hy-Power.

Medicine, nanoelectronics, social implications, and figuring it all out

Monday, August 27th, 2012

Given today’s (Aug. 27, 2012) earlier posting about nanoelectronics and tissue engineering, I though it was finally time to feature Michael Berger’s Aug. 16, 2012 Nanowerk Spotlight essay, The future of nanotechnology electronics in medicine, which discusses the integration of electronics into the human body.

First, Berger offers a summary of some of the latest research (Note: I have removed  links),

In previous Nanowerk Spotlights we have already covered numerous research advances in this area: The development of a nanobioelectronic system that triggers enzyme activity and, in a similar vein, the electrically triggered drug release from smart nanomembranes; an artificial retina for color vision; nanomaterial-based breathalyzers as diagnostic tools; nanogenerators to power self-sustained biosystems and implants; future bio-nanotechnology might even use computer chips inside living cells.

A lot of nanotechnology work is going on in the area of brain research. For instance the use of a carbon nanotube rope to electrically stimlate neural stem cells; nanotechnology to repair the brain and other advances in fabricating nanomaterial-neural interfaces for signal generation.

International cooperation in this field has also picked up. Just recently, scientists have formed a global alliance for nanobioelectronics to rapidly find solutions for neurological disorders; the EuroNanoBio project is a Support Action funded under the 7th Framework Programme of the European Union; and ENIAC, the European Technology Platform on nanoelectronics, has decided to make the development of medical applications one of its main objectives.

Berger cites a recent article in the American Chemical Society’s (ACS) Nano (journal) by scientists in today’s earlier posting about tissue scaffolding and 3-D electrnonics,

In a new perspective article in the July 31, 2012, online edition of ACS Nano (“The Smartest Materials: The Future of Nanoelectronics in Medicine” [behind a paywall]), Tzahi Cohen-Karni (a researcher in Kohane’s lab), Robert Langer, and Daniel S. Kohane provide an overview of nanoelectronics’ potential in the biomedical sciences.

They write that, as with many other areas of scientific endeavor in recent decades, continued progress will require the convergence of multiple disciplines, including chemistry, biology, electrical engineering, computer science, optics, material science, drug delivery, and numerous medical disciplines. ”

Advances in this research could lead to extremely sophisticated smart materials with multifunctional capabilities that are built in – literally hard-wired. The impact of this research could cover the spectrum of biomedical possibilities from diagnostic studies to the creation of cyborgs.”

Berger finishes with this thought,

Ultimately, and here we are getting almost into science fiction territory, nanostructures could not only incorporate sensing and stimulating capabilities but also potentially introduce computational capabilities and energy-generating elements. “In this way, one could fabricate a truly independent system that senses and analyzes signals, initiates interventions, and is self-sustained. Future developments in this direction could, for example, lead to a synthetic nanoelectronic autonomic nervous system.”

This Nanowerk Spotlight essay provides a good overview of nanoelectronics  research in medicine and lots of  links to previous related essays and other related materials.

I am intrigued that there is no mention of the social implications for this research and I find social science or humanities research on social social implications of emerging technology rarely discusses the technical aspects revealing what seems to be an insurmountable gulf. I suppose that’s why we need writers, artists, musicians, dancers, pop culture, and the like to create experiences, installations, and narratives that help us examine the technologies and their social implications, up close.

Toxicology convo heats up: OECD releases report on inhalation toxicity testing and Nature Nanotechnology publishes severe critique of silver toxicity overanalysis

Thursday, July 5th, 2012

This has to be one of the rawest reports I’ve seen and that’s not a criticism. The OECD (Organization for Economic Cooperation and Development) has released no. 35 in its Series on the Safety of Manufactured Nanomaterials titled, INHALATION TOXICITY TESTING: EXPERT MEETING ON POTENTIAL REVISIONS TO OECD TEST GUIDELINES AND GUIDANCE DOCUMENT.

This report is the outcome of a meeting which took place in fall 2011 according to the July 4, 2012 news item on Nanowerk,

The expert meeting on Inhalation Toxicity Testing for Nanomaterials was held on 19-20 October 2011 in The Hague, hosted by the Netherlands, with the aim of discussing the results of the OECD Sponsorship Programme (under the responsibility of SG3) on this specific topic and addressing issues relevant to inhalation toxicity. Fifty experts from the WPMN as well as the OECD Working Group of the National Coordinators for the Test Guidelines programme (WNT) participated in the meeting.

This is a partial list of recommendations from the report,

Recommendations raised by the speakers for the discussion

7. Various recommendations were raised by the speakers that served as points for discussion. These recommendations do not necessarily reflect a general agreement. …

• “Provide explicit guidance for the generation of aerosols (sample preparation) based on the exposure scenario”. Hans Muijser

• “Generation of a test atmosphere should have workplace characteristics, but should be adapted to adjust for rodent respirability”. Günter Oberdörster

• “A choice for a dry aerosol or a liquid aerosol should depend on the given test substance and planned test approach (hazard- or risk driven)”. Otto Creutzenberg

• “Aerosol characterization should include size distribution, mass, number and morphology of the material”. Günter Oberdörster

• “Mass concentration is not sufficient for comparison of nanomaterials of the same chemical composition”. Flemming Cassee

• “Dry powders will appear as agglomerate upon aerosolization, which needs to be addressed in the sample preparation guidelines”. Flemming Cassee

• “Dissolution behaviour of the test substance should be assessed in physiological fluids mimicking various lung-specific pH ambiences (neutral, acid)”. Otto Creutzenberg

• “Data analysis should include interpretation of aerosol characteristics, NOAEL, risk assessment implications, mode of action and a strategy for dosimetric extrapolation to humans. The inclusion of biokinetic data is important”. Günter Oberdörster

• “Include biokinetics in the guidance, since different distribution patterns in the whole organism are likely dependent on physicochemical characteristics of nanoparticle aerosols and the dose at the target site will therefore be different. This will allow the assessment of accumulation of nanomaterials in the body at low exposure levels and long-term exposure. A way to perform it is by radiolabelled materials, chemical elemental analysis to determine organ concentrations and transmission electron microscopy”. Wolfgang Kreyling. Others who have suggested inclusion of biokinetics or recognized the importance were Otto Creutzenberg, Frieke Kuper, Günter Oberdörster and David Warheit. (p. 13)

You actually see who made the recommendations! Speakers discussed carbon nanotubes, titanium dioxide, cerium oxide, zinc oxide and more, all of which you can read about in summary form in this 38 pp. report.

Meanwhile, Nature Nanotechnology has published an incendiary commentary about nanosilver and the latest request by the European Commission for another study.  Michael Berger has devoted a July 4, 2012 Nanowerk Spotlight article to the commentary,

A commentary by Steffen Foss Hansen and Anders Baun in this week’s Nature Nanotechnology (“When enough is enough”  [behind a paywall]) pointedly asks “when will governments and regulatory agencies stop asking for more reports and reviews, and start taking regulatory action?”

Hansen and Baun, both from the Technical University of Denmark’s Department of Environmental Engineering, take issue with yet another scientific opinion on nanosilver that has been requested by the European Commission in late 2011: “SCENIHR – Request for a scientific opinion on Nanosilver: safety, health and environmental effects and role in antimicrobial resistance” (pdf). Specifically, the EC wants SCENIHR to answer four questions under the general heading of ‘Nanosilver: safety, health and environmental effects, and role in antimicrobial resistance’.

“Most of these questions – and possibly all of them – have already been addressed by no less than 18 review articles in scientific journals, the oldest dating back to 2008, plus at least seven more reviews and reports commissioned and/or funded by governments and other organizations” Hansen tells Nanowerk. “Many of these reviews and reports go through the same literature, cover the same ground and identify many of the same data gaps and research needs.”

Here’s a prediction from Hansen and Baun as to what will be in the next report due in 2013  (from the Nature Nanotechnology commentary When enough is enough in 7, 409–411 (2012) published online  July 1, 2012 [Note: I have removed links and footnotes]),

… we predict that the SCENIHR’s upcoming review will consist of five main sections summarizing: the properties and uses of nanosilver; human and environmental toxicity; microbial resistance; risk assessment; and research needs. We also predict that the SCENIHR’s report will say something along the following lines: “Nanosilver is reportedly one of the most widely used nanomaterials in consumer products today but the scale of production and use is unknown. The antibacterial properties of nanosilver are exploited in a very diverse set of products and applications including dietary supplements, personal care products, powdered colours, textile, paper, kitchenware and food storage.” And like many previous reviews and reports, the new report is likely to cite the Consumer Product Inventory maintained by the Project on Emerging Nanotechnologies.

We acknowledge that answering the question of how to regulate the use of nanosilver is not easy given the different views of the different stakeholders in this debate and the complex regulatory landscape associated with the many applications of nanosilver. …

Arguably, we all want that the pros and cons of regulatory policy options be based on the best available science while taking broader socio-economical and ethical aspects into consideration before deciding on the appropriate regulatory measures concerning human and environmental exposure to nanosilver. Although it is common for independent scientific experts to be commissioned to gather, analyse and review the available scientific information, and to provide recommendations on how to address a given risk, we do not see the need for further reviews. It is time for the European Commission to decide on the regulatory measures that are appropriate for nanosilver. These measures should then be implemented wholeheartedly and their effectiveness monitored.

I predict this commentary will provoke some interesting responses and I will try to add the ones I can find to this posting as they become available.

ETA July 6, 2012: Dexter Johnson weighed in with his July 5, 2012 posting (Note: I have removed a link),

What may make the matter even worse is that we may already have a pretty substantial framework—in the US, at least—on which to base nanosilver regulations, which dates back to the 1950s. It concerned what was called at the time collodial silver, which is essentially what today is called nanosilver.

But getting back to current stagnant state of affairs, it’s hard to know exactly what’s causing the paralysis. It could be concern over implementing regulations in a depressed economy, or just a fear of taking a position. But in both these instances, the lack of action is making the situation worse. …

Nanoparticles go boom!

Wednesday, March 21st, 2012

MIKE3 test apparatus. (image taken from "Fire and explosion properties of nanopowders", Research Report RR782, UK Health and Safety Executive)

Michael Berger at Nanowerk has written a Spotlight essay on the explosivity of nanoparticles. From the March 20, 2012 essay,

Recent studies have found that nanomaterials – in this case dusts and powders having nanosize particles – exhibit an explosion severity which is not disproportionate to micrometer-sized materials, but the likelihood of explosion is quite high due to very low ignition energies and temperatures.

The review concludes that nanomaterials present a dust explosion hazard, with metallic nanoparticles being particularly reactive. Nanomaterials have been shown to display lower ignition energy and temperature requirements than larger particles. Due to this high sensitivity, explosion hazards may exist for many processes including, but not limited to, mixing, grinding, drilling, sanding, and cleaning.

The essay is well worth a read as Berger synthesizes information from more than one study and he provides some technical detail.

Machine/flesh, robotic venus flytraps, and artificial muscles

Tuesday, March 6th, 2012

On the heels of yesterday’s musings about machine/flesh in the context of my Carbon nanotubes, neurons, and spinal cords … posting, there’s a new Spotlight essay (on Nanowerk) by Michael Berger titled, Robotic Venus flytrap aids artificial muscle research. From the essay,

Mohsen Shahinpoor, Richard C. Hill Professor & Chairman Mechanical Engineering Department at the University of Maine, has created a robotic replica of the carnivorous Venus flytrap with nanosensors and a thin, pliable metal composite material that he invented as part of his ongoing artificial muscle research. The device offers promise in the development of electrically stimulated artificial muscle that could be implanted in people to help overcome muscular disease or paralysis.

It’s the Venus flytrap’s (Dionaea muscipula) trigger sensitivity to movement (when the plant feels movement along certain hairs, it snaps shut within milliseconds to trap its prey). Here’s an image from the Botanical Society of America’s Mysterious Venus Flytrap webpage which illustrates the hairs (cilia) that act as triggers,

Venus flytrap trigger hairs

I have briefly glanced at the research paper, Biomimetic robotic Venus flytrap (Dionaea muscipula Ellis) made with ionic polymer metal  composites (open access PDF), published by IOP Publishers in its Bioinspiration & Biomimetics journal (vol. 6, no. 4). The introduction, the conclusion, and the images are the most accessible for someone (like me) who doesn’t have a background in electrical engineering. Here’s a bit from the introduction (Note: I have removed the bibiographic notes),

The rapid closure of the VFT lobes in about hundreds of milliseconds is one of the fastest nastic movements in higher plants. Darwin described the VFT plant as ‘one of the most wonderful plants in the world’. Mechanical stimulation of trigger hairs in the lobes of the VFT by a prey causes the traps to close rapidly. The reader is referred to a number of studies on the mechanism of closing of lobes of the VFT as described in … Note that Batalin was the first to propose a possible mechanism for such nastic movements in higher plants. Sibaoka discussed the physiology of rapid movements in higher plants.

Here, we propose that the mechanisms of sensing of the prey wiggling in its lobes by the trigger hairs and the trap closing of VFT are very similar to sensing and actuation mechanisms in IPMCs and thus one can design, fabricate and operate a biomimetic robotic VFT equipped with IPMCs [ionic polymeric metal composite].

The researchers don’t mention any applications (none I could find in the paper) for these progenitors to artificial muscles but Berger notes at the end of his essay,

The development of artificial muscles is one of the key areas for bionic enhancements or replacements. Artificial muscles like these could find applications in the medical field or for engineering applications.

I suppose you can’t call the possible integration in medical applications of these artificial muscles machine/flesh so much as they are plant/machine/flesh.