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The Scientist:2011十大创新技术

出处:WEB 2012年06月13日作者:WEB责任编辑:lucy点击:6879

The Scientist杂志近日评选出了2011年十大创新技术,The Scientist杂志邀请了来自多处的科研机构,制药公司参评,最终评选了2011年十大创新技术。这是其第四次进行此类评选,这些成果主要包含了一些来自显微技术方面的最新技术进展,本文精选其中四种技术做一介绍。

The Scientist杂志近日评选出了2011年十大创新技术,The Scientist杂志邀请了来自多处的科研机构,制药公司参评,最终评选了2011年十大创新技术。这是其第四次进行此类评选,这些成果主要包含了一些来自显微技术方面的最新技术进展,本文精选其中四种技术做一介绍。

360度扫描光学断层成像系统

光学成像可能是现今功能性活体成像研究最广泛使用的造影模式。去年美国Bioscan公司推出了首款360度光学成像仪器:BioFLECT,其中是FLECT指FLuorescence Emission Computed Tomography。这一款仪器从真正意义上实现了断层成像,全方位监测光子,而且能在动物体内实现荧光三维定位,不会出现失真。

BioFLECT的原理是汇集了来自360度的光子,并采用组织间光子传递模型的最新3D影像重建技术,从而能获得目前最准确的光学定量结果之一。FLECT系统的雷射激发样品中的荧光物质,使得荧光物质发射出不同波长的光,再经由检测器接收此光子,然后机体旋转改变位置,再一次重复这一过程,直到扫描完全方位及全长。

口袋PCR技术:FilmArray系统

与单重qPCR相比,多重qPCR技术可以获得更加丰富的数据,这当然的代价就是需要更多时间和精力。但是随着技术的发展,大型多重PCR检测现在也越来越方便和简单了。

由Idaho Technology公司推出的FilmArray就是这样一款简化的分子检测技术产品,利用这一系统,检测一份样品可在不到1个小时内获得结果,实际动手操作时间只有5分钟。为了证明这一点,Idaho Technology公司生化部主任Mark Poritz让他九岁的儿子亲自操作,结果证明1小时之内,他的儿子便成功获得了结果。这种方便快捷的原因是由于这一系统能将样品制备、放大、检测和分析整合为一个完全自动化的系统,因此能够快速检测1份样品中的100多种物质。

Idaho Technology公司总裁Kirk Ririe说,“FilmArray是一种有效的分子诊断检测分析,可以用于常见呼吸道病原的综合检测,而且系统的使用还是异乎寻常的简单容易”。

便携式显微镜

2010年,美国科学家发明了一种世界上最小、最轻的微型显微镜。该新型无透镜成像技术被认为不仅削减了与医疗照顾相关的成本,还将给资源条件有限的地区提供快捷、廉价的医学诊断,也将远程医疗向前推进了一步。相关成果公布在Lab on a Chip杂志上。这项研究由加州大学洛杉矶分校Aydogan Ozcan指导开发,这一显微技术被命名为LUCAS(侧影成像的无透镜超宽视野监测阵列),LUCAS使用波长为470纳米的蓝光照射血液、唾液或其他液体样本,通过传感器阵列就能获得微粒子的清晰图像。

LUCAS仅46克,是一个自成一体的成像设备,其仅有的外设为一个可与智能手机、掌上电脑(PDA)或计算机相连的USB接口,可经此供电。这台功能强大、成本低廉的无透镜显微镜可装入一个极小包装;大量设计元素将使其在资源条件有限的地区,特别是非洲的一些国家大显身手,帮助监测诸如疟疾、艾滋病和肺结核等疾病。

单细胞分析CyTOF

 DVS Sciences公司推出了一个新型细胞分析方法平台:CyTOF Mass Cytometry,为科学家们了解病变状态、干细胞和其他生物相关系统的细胞动力学,提供了又一先进工具。CyTOF ——MAXPAR系统克服了传统流式细胞术的局限性,简化了样品制备,并且可同时识别高达100个生物标记,具有高分辨率和较宽的动态范围。CyTOF系统已安装于领先实验室,遍及美国、加拿大、欧洲和亚洲。

通常采用的荧光抗体标记细胞表面蛋白结合流式细胞术检测的方法,虽然能实现细胞分选,但只能够同时识别6-10种不同颜色的荧光,且还需尽量避免发生荧光重叠。而这项研究通过这个可以称为大量细胞计数法的方法,观察了人类骨髓产生的不同形态细胞中及表面的34种物质,不但能正确归类10多种不同类型的免疫细胞,还能观察到各类免疫细胞的内部变化,从而预知可能发生的变化。这将有助于更快更广泛的测量处方药对人体细胞的反应及功效,提前发现细胞病变,研发出针对个人的治疗药物。

研究人员利用这一可以追踪单细胞多达45种(潜在性的100种或者更多)的技术观察了人类骨髓产生的不同形态细胞中及表面的34种物质。而且更为重要的是,研究人员不但能正确归类10多种不同类型的免疫细胞,还能观察到各类免疫细胞的内部变化,从而预知可能发生的变化。
 Top Ten Innovations 2011

Our list of the best and brightest products that 2011 had to offer the life scientist

By The Scientist Staff | January 1, 2012

In its brief, 4-year history, The Scientist’s annual Top 10 Innovations contest has become a showcase of the coolest life science tools to emerge in the previous year. This year’s installment is no exception. We received more than 65 entries describing exciting new technologies and intriguing methodologies that made their way into labs in 2011.

Our panel of expert judges sifted through the submissions, and the cream of all these innovative products rose to the top. Björn Brembs, from the Freie Universität in Berlin, Medical University of Vienna neuronal cell biologist Michael Kiebler, Pacific Northwest National Laboratory biologist H. Steven Wiley, and Aris Persidis, president of Biovista, a pharmaceutical services company, combined forces to see that the very best of the entries were awarded this year’s prizes.

The Top 10 Innovations of 2011 include a number of the latest advances in microscopy—from a pocket microscope that can be connected to a cell phone’s optics to tools that smash the resolution limitations of traditional scopes, a neat tool to measure light exposure and circadian rhythms, and a first-of-its-kind 360-degree optical imager. Congratulations to all the winners of 2011’s Top 10 Innovations contest, and here’s to the researchers who will use these tools to break new scientific ground and expand our understanding of biology in the months and years to come.

Pocket Microscope

LUCAS

Diagnosing malaria or other blood-borne illnesses used to require analyzing cell slides under a bulky, costly light microscope—which can be difficult to find in impoverished, remote locations. Enter LUCAS (Lensless, Ultra-wide-field Cell monitoring Array platform based on Shadow imaging), an easy-to-use, pocket-size holographic microscope that weighs less than 50g, uses inexpensive, off-the-shelf parts, and can be attached to a cell phone’s camera, making it ideal for diagnosing disease in isolated, developing countries.

“In resource-poor areas, you don’t have a hospital or any other infrastructure to conduct all these tests, so if you could simplify all this microscopy you could really have a huge impact,” says the microscope’s inventor, Aydogan Ozcan, an electrical engineer at the University of California, Los Angeles (UCLA).

LUCAS, which could cost as little as $10, illuminates cells with an inexpensive light-emitting diode, captures the shadows they cast, and then processes and recreates the image using an algorithm run on a remote computer. The translucent cells cast “textured” shadows that can reveal internal cell features such as malaria parasites. The microscope has submicrometer resolution but can image very large areas, Ozcan says. And because cell phone networks are ubiquitous, “even in an African village you can connect to a supercomputer in LA” to process the images, he adds.

Next year, Karin Nielsen, an infectious disease pediatrician at UCLA, will venture deep into the Amazon to compare the portable microscope’s ability to diagnose malaria with that of old-fashioned microscopy. Nielsen is also testing the microscope’s ability to diagnose anemia, low white blood cell count, and intestinal parasites in stool.

Persidis: This is an exciting new technology that showcases ingenuity away from preconceived ideas.

Brembs: It is a cheap way of doing something that usually requires a microscope.

All Around the Mouse

BioFLECT

The life science community, particularly the drug-development world, has embraced in vivo optical imaging as an important research tool. But optical imagers have traditionally used a light source on only one side of the animal and a single camera or detector on the other, limiting the quantification and localization of fluorescent tags. This past September, Bioscan introduced BioFLECT, the first 360-degree optical imager, which uses a rotating ring of 48 detectors to generate a full 3-D scan of fluorescent markers.

“If I use the commercial optical imaging systems that are available right now, I have the problem that these images are only taken from one side of the animal,” says Alex Klose, a physicist at Columbia University who helped develop the software that accompanies BioFLECT. “[BioFLECT] is a system that scans the entire animal from [all sides], which gives me far more data for optical imagery reconstruction.”

The standard package, the BioFLECT 400, sells for $295,000 and includes four lasers (to activate the fluorescent molecules) and four filters (to measure only the desired wavelength of emission), but the machine can be equipped with up to 12 different lasers and 16 different filters. “You may want to label some cancer cells at one wavelength, and then inject some kind of therapy that you’ve colabeled at another wavelength,” says James Masciotti, Bioscan’s lead imaging scientist on the project.

Kiebler: The promised range of resolution would be a clear improvement and very desired in the field to detect signals in living specimens. It would be fantastic to bring this as a routine system into standard imaging labs dealing with animals.

Wiley: This instrument should greatly enhance the sensitivity and accuracy of locating fluorescently labeled cells and compounds in live animals, enabling a whole range of in vivo experiments.

PCR in a Pouch

FilmArray system

When Mark Poritz, director of biochemistry at Idaho Technology Inc., wanted to demonstrate how simple it was to use the company’s FilmArray system for identifying pathogenic strains in patient specimens, he had his 9-year-old son man the machine. His son successfully rehydrated the PCR reaction pouch and injected a prepared sample of the specimen before sliding the pouch into the $50,000 machine and starting the reaction. One hour later, the results were ready.

The FilmArray system was designed to make pathogen detection simple, accurate, and fast. According to Ray Widen, director of molecular diagnostics at Tampa General Hospital, it does just that. Widen’s facility, which tests bronchial and nasal swab samples from patients before and after organ transplantation, was running separate PCR reactions for flu, respiratory syncytial virus (RSV), and parainfluenza virus, and it cost “$340 to do that whole panel,” he says. Because there are multiple nested PCR reactions within each FilmArray pouch, one run can detect all of these pathogens, and others, at a cost of less than $150, explains Widen. Plus, the FilmArray reaction does not require a trained technician and only takes an hour rather than the 5–6 hours needed for a traditional, real-time PCR reaction. All of the sample preparation and DNA purification steps are contained within separate chambers in the FilmArray pouch.

Currently, Idaho Technology has FDA approval for the diagnostic use of only one FilmArray test—its respiratory panel, which detects 15 respiratory pathogens, including RSV, rhinovirus, and several strains of influenza. But the company is also developing panels for detecting blood-borne bacteria and common fungal pathogens, as well as one for gastrointestinal pathogens, including enterohemorrhagic strains of E. coli (EHEC); a sexually transmitted diseases panel; and a biothreat panel.

Wiley: Incredibly easy one-step multiplexed PCR. Anyone could operate this instrument.

Persidis: PCR detection at essentially a point-of-care scenario is an important advance and this technology sets the stage.

Single-Cell Mass Cytometry

CyTOF

When Scott Tanner, chief technology officer of DVS Sciences, first approached Stanford University geneticist Garry Nolan to discuss the new mass spectrometer he had designed, Nolan thought it was going to be yet another sales pitch. But soon Nolan was rapt. “If he’s right, this is groundbreaking,” he recalls thinking. Hearing Tanner’s idea was the kind of thing where “the hairs on the back of your neck stand on end.”

CyTOF, the instrument that Tanner described, is a mass spectrometer that can feed researchers data about molecules within and on the surface of individual cells, revealing not only the cell’s identity but also some of its functions. By attaching mass-spec-detectable stable isotopes to antibodies specific to a biomolecule of choice, researchers can harness the speed and specificity of mass-spec analysis, giving what approaches an “omics” view of individual cells. Most omics analyses take an average reading from a large population of cells, obscuring subtle differences in individual cells or subpopulations of cells. “I saw us being able to look at the whole immune system at once and all of the biology it could do,” Nolan says.

Nolan used the machine, which costs about $600,000, to better elucidate a broad range of immune-cell developmental stages and signaling responses, providing a mineable resource for immunologists studying those cell types. The results, including some revealing new findings, were published in a recent Science paper (332:687-96, 2011). Nolan plans to use the other two machines he bought to hunt for weaknesses in individual cancer stem cells, with the hope of developing drugs that could target this small subpopulation.  “A lot of very good drugs have been thrown out with the bathwater,” says Nolan, because they were applied to a broader population of cells.

Wiley: Revolutionary instrument allowing the analysis of potentially over a hundred different antibodies binding to thousands of cells. It will enable a new generation of systems analysis at the single-cell level that can be directly applied to clinical samples.

Illuminating Microscopy

N-SIM Super Resolution Microscope

The invention of structured illumination microscopy (SIM) in 2000 by University of California, San Francisco, researchers revolutionized high-resolution optical imaging by breaking through the diffraction barrier that limits conventional microscopes to a resolution no finer than 200–250 nm. The technology, which involves shining patterned light on a subject from different angles and then using computer algorithms to extract information from the resulting fringe patterns to produce a high-resolution image, doubled the resolution possible using conventional optics.

Nikon took notice of this achievement and incorporated SIM technology into its flagship inverted microscope to produce the N-SIM Super Resolution Microscope—one of the fastest and most powerful high-resolution optical microscopes on the market. Announced in the spring of 2010 and delivered in 2011, the N-SIM microscope can achieve a spatial resolution between 85 and 110 nm and a temporal resolution of 600 milliseconds per frame, which allows for dynamic, live-cell imaging.

“N-SIM technology provides researchers with the ability to combine the molecular specificity of fluorescently tagged proteins with a significant improvement in resolution,” explains Christopher O’Connell, super-resolution systems product manager at Nikon, “allowing them to observe fine structural details which were previously obscured by diffraction.”

A total of $600,000 will buy you “everything you need to have the system fully operational,” O’Connell says. This includes software, lenses, filters, a highly sensitive camera, two lasers (upgradable to five) for fluorescence microscopy, and “the table that the microscope sits on.” However, the system is highly modular, O’Connell adds, allowing for the combination of other technologies—such as confocal microscopy and Nikon’s STochastic Optical Reconstruction Microscopy (N-STORM) system—with the same microscope.

Kiebler: Structured illumination has been shown to improve imaging in the nm range. It would be fantastic to bring this as a routine system into standard imaging labs.

DNA Deluge

ThunderStorm System

RainDance Technologies’ ThunderStorm System for DNA sequencing is the newest iteration of the company’s popular next-generation RDT1000 model. While other PCR enrichment systems allow researchers to process fewer than 100 gene regions, the ThunderStorm allows researchers to sequence up to 20,000 regions per sample.

The ThunderStorm isolates DNA in tiny droplets “several millionfold smaller than the volume of reactions that you’d use in typical PCR,” says RainDance Chief Marketing Officer Andy Watson. This enables the Thunderstorm to process 96 samples at once using a fraction of the reagents needed for traditional PCR. As an added advantage, “it’s a load-and-walk-away system” that is completely automated. Because it doesn’t have the user-induced variability of manual PCR, says Rob Kirkpatrick, project manager at the British Columbia Cancer Agency, “that gives you confidence you’ll get the same result each time.”

The product is ideal for large genome-wide association studies with thousands of samples where researchers want to target regions of interest for more complete sequencing, Watson says. The ThunderStorm also has a “deep-sequencing mode,” Watson adds, which allows researchers, like those at the BC Cancer Agency, to identify dozens of cancer-causing mutations in tumor cells—whether the mutations are present in 1 or 100 percent of the cells.

The system costs about $295,000 and each sample consumes about $100 to $200 in supplies. Watson won’t disclose how many have been sold, but the product is aimed at pharmaceutical companies and centers that do large amounts of genetic screening, he says.

Wiley: This is an extremely elegant, fully automated, high-throughput, targeted resequencing system based on a unique approach for creating and merging millions of individual microdroplets of reactants.

Mini MRI

M2 Compact MRI System

Owning a magnetic resonance imaging (MRI) machine generally requires a lead-lined room, a plumbed-in cooling system, expert operators, and a few million dollars. Now, all you need is about one square meter of space and $500,000.

“We’ve taken the Rolls-Royce and tried to simplify it as much as possible,” says Rob Sandler of Aspect Imaging, which makes the new M2 Compact MRI System. “It doesn’t require a special room . . . it doesn’t require cooling,” says Sandler. “You plug it in, and it starts to work.”

Having its own lead-lined housing means the M2 can be used in a standard laboratory and avoids the credit card–erasing, watch-destroying, and medical instrument–damaging effects of large-scale MRI machines. “You can actually put your iPhone and your wallet right on top of the machine and there’s no effect,” says Bob Lenkinski of UT Southwestern Medical Center in Dallas. Lenkinski uses one of 20 M2s sold so far to image prostate tumors in mice. “That makes a big difference—you don’t have to worry about safety or anything.”

Lenkinski superimposes the images he generates with images taken by a positron emission tomography machine. Before getting the M2, this proved difficult, because the MRI machine he used was several floors away. Now both machines are next to each other in his lab.

The M2 uses a highly efficient one-tesla magnet. Full-size MRIs use stronger magnets—between seven and eleven tesla. Although for some imaging techniques larger MRI machines will generate higher-resolution images, Sandler says that for 70–80 percent of applications the M2’s resolution is comparable, at “a fraction of the cost and complexity.”

Persidis: A portable MRI instrument that can be used in a non-expert dedicated lab represents a significant advance for this important technique.

The Circadian Watch

Dimesimeter

Wear it as a wristband, badge, pendant, or pin it to your shirt or hat—the Dimesimeter isn’t the latest fashion statement, but it may offer researchers insights into how disrupting circadian rhythms affects human physiology, behavior, and disease. Developed by scientists at the Lighting Research Center at Rensselaer Polytechnic Institute, the battery-powered, dime-sized Dimesimeter contains optical sensors and accelerometers that measure both the light exposure and activity of the person wearing it. The device then transmits data wirelessly to a docking station, which can be linked to a computer.

“Biology is driven by circadian rhythms at every level,” says Mark Rea, director of the Lighting Research Center and one of the developers of the device, which costs $100. “By quantifying the amount of light that people are exposed to, we’re getting new insights into a lot of diseases.” Rea and Mariana Figueiro, Light and Health Program director at the Lighting Research Center, employed the Dimesimeter in a study that determined optimal home lighting conditions to improve sleep efficiency in Alzheimer’s patients.

The Dimesimeter’s optical setup consists of red, green, and blue light detectors that measure light exposure of the subject. Through post processing, researchers can determine the amount circadian light (the light that modulates the biological clock) entering the eye. “It is the first and only of its kind that measures light as it impacts the visual system and light as it impacts the circadian system,” says Figueiro.

Since the device was first introduced in June 2011, more than 300 units have been deployed around the world. Onboard memory capacity allows data to be continuously recorded for up to 33 days, depending on the logging interval. Because the devices are sealed with an epoxy coat, battery life limits the device’s lifetime to at least 10 weeks of operating time and a year on standby.

Brembs: This seems to be an easy way to trace the circadian habits of many people over quite long time scales.

One-Step Sample Prep

LAESI

To prepare material for analysis by mass spectrometry, chemist Akos Vertes of George Washington University developed Protea Biosciences, Inc.’s LAESI (Laser Ablation Electrospray Ionization) DP-1000 System, which can handle any type of biological sample that contains water—either naturally, as in animal or plant tissues, or water added by the experimenter.

The sample is first subjected to a mid-infrared laser exactly 2,940 nm in wavelength, which corresponds to the frequency at which the O—H bond in water vibrates. As a result, the laser creates “a little volcanic explosion,” says Protea Chief Science Officer Matthew Powell, “and everything within that crater is thrown up into the air,” instantaneously converted into a gas. The vaporized biomolecules intersect with a high-voltage electrospray plume, which adds a charge to the components and dissolves them in water droplets so they can be identified using traditional mass spectrometers.

Brent Reschke, senior scientist at Protea, has already put the technology to work identifying the chemical signatures of plant leaves,  flower petals, and frozen organ tissue samples from mice. Now he’s collaborating with West Virginia University (WVU) researchers to examine frozen samples of human skin “with the ultimate goal of being able to go through and map out skin cancer,” he says.

Callee Walsh, another Protea senior scientist, is also collaborating with WVU to identify biomarkers in leukemia cells that correlate with resistance to chemotherapy—results that she’s planning to present at the upcoming American Association for Cancer Research meeting in Chicago in April. “With the LAESI, there’s very little sample preparation involved,” she says. “[With] traditional methods, experiments such as these could take several days, whereas [with] LAESI, it takes a few hours.”

So far, the technology is compatible with mass spectrometers from two vendors, Thermo and Waters, and Protea is working with AB Sciex to develop an integration kit for its mass spectrometer as well. The unit, including the software and integration kit, costs $240,000. Protea plans to send its first shipment of the technology to buyers this quarter.

Wiley: A new way of doing imaging mass spectrometry that gets away from some of the extensive sample preparation previously needed. Should make MS-imaging more reproducible and accessible.

Super-Resolution Solution

SR GSD Microscopy System

A few years ago, a new super-resolution technique increased fluorescence microscopy resolution tenfold by effectively breaking the 200–250 nm diffraction limit—the minimum spacing at which two objects could be seen separately. But, says Chris Vega of Leica Microsystems, the method had two shortcomings: the need for specialized fluorescent labels and the occurrence of drift during image acquisition. Both of these have been addressed in the new Leica SR GSD microscopy system, which rounds out our list of this year’s top innovations.

It’s impossible for a standard fluorescent microscope to resolve objects less than 200 nm apart because their emitted light waves overlap. Super-resolution microscopy gets around this hurdle by illuminating only a few random molecules in the field of view at a time, taking a picture, and then repeating the process thousands of times until all the molecules have been illuminated and imaged.  Neighboring objects are unlikely to be illuminated at the same time and thus can be visually separated.

The random-illumination strategy has traditionally required specialized photoactivatable labels, but the SR GSD approach involves high-powered laser excitation of standard fluorescent labels, which causes them to randomly switch to a temporary dark state. “The GSD allows us to use the set of fluorescent ALEXA dyes and antibodies that we are also using for classical epifluorescence,” says Ralf Jacob of Philipps-Universität in Marburg, Germany, who owns one of the systems. “This is a great advantage,” he says.

To address the second problem—drift—Leica developed the SuMo stage, which stands for Suppressed Motion. “The stage actually mounts to the objective, which keeps the two spatially aligned,” explains Vega. The stage also has a motorized self-correcting mechanism.

Both solutions are aimed at “making super resolution accessible and easy to use for the researcher,” says Vega. He declined to reveal how much the system costs.

Kiebler: Many people consider improvement in imaging as one of the most exciting fields in light microscopy. It would be fantastic to improve imaging in the nm range.

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