עבודה זו נתמכה על ידי מימון ההפעלה מבית הספר להנדסה, אוניברסיטת וירג&#39;יניה וחלק ממכשירים אלקטרוניים הוכנו במתקני microfabrication במיקרואלקטרוניקה וירג&#39;יניה מרכז רייט. אנו מכירים חוקרים שתרמו תרומה למכשיר ונתונים קליניים (איורים 3 ו -5 במאמר זה), שנרכש מהמאמר שפורסם 10. תודה וו-HY יושיאקי האטורי ל, תוכנת הקלטת נתונים המותאמת אישית.

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A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transfer+Printing+Techniques+for+Materials+Assembly+and+Micro/Nanodevice+Fabrication.">Transfer Printing Techniques for Materials Assembly and Micro/Nanodevice Fabrication.</a> Adv Mater. 24 (39), 5284-5318 (2012).</li><li>Yeo, W. H., Webb, R. C., Lee, W., Jung, S., Rogers, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bio-integrated+electronics+and+sensor+systems.">Bio-integrated electronics and sensor systems.</a> Proc Spie. 8725, (2013).</li><li>Chung, H. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+of+Releasable+Single-Crystal+Silicon&#8211;Metal+Oxide+Field-Effect+Devices+and+Their+Deterministic+Assembly+on+Foreign+Substrates.">Fabrication of Releasable Single-Crystal Silicon&#8211;Metal Oxide Field-Effect Devices and Their Deterministic Assembly on Foreign Substrates.</a> Adv Funct Mater. 21 (16), 3029-3036 (2011).</li><li>Kim, H. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Unusual+strategies+for+using+indium+gallium+nitride+grown+on+silicon+(111)+for+solid-state+lighting.">Unusual strategies for using indium gallium nitride grown on silicon (111) for solid-state lighting.</a> Proc Natl Acad Sci U.S.A. 108 (25), 10072-10077 (2011).</li><li>Padilla-Medina, J. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessment+technique+for+acne+treatments+based+on+statistical+parameters+of+skin+thermal+images.">Assessment technique for acne treatments based on statistical parameters of skin thermal images.</a> J Biomed Opt. 19 (4), 046019-046019 (2014).</li></ol>

The authors declare that they have no competing financial interests.

This article highlights the methods and protocols to fabricate a conformal, skin-like electronics system that enables conformal lamination near the wound tissues, which offers quantitative measurement of skin temperature and thermal conductivity mapping on the skin. 
The key features include the utilization of novel techniques of materials transfer printing and hard-soft materials integration to design and develop the flexible/stretchable, soft electronic device. The use of biocompatible, elec...

במחקר קליני ומחקר ביו-רפואי, ניטור של ריפוי פצע התמקד בשיטה פולשנית המבוססת על ההערכה היסטולוגית של שינוי מורפולוגי רקמה בפצעי 1,2. לאחרונה, התקדמות מהירה בטכנולוגיות אלקטרוניות תאפשר הפיתוח של כלים הדמיה וניתוח דיוק גבוה שיכול לבדוק חזותי תהליך ריפוי הפצע באמצעות הדמיה דיגיטלית 3,4 או מיקרוסקופ סריקת confocal וספקטרוסקופיה 4,5. עם זאת, גישות הדמיה אלה דורשים עלות גבוהה, כלים אופטיים מסובכים ופעולות, ויותר מכך, חולים צריכים להיות משותקים במהלך בדיקה. לכן, קיים צורך למכשירים ומערכות חדשים, כי הם כמותי, לא פולשנית, קל לשימוש, זולים, ורבים תכליתיים להציע ניהול פצע מדויק יותר. הנה, אנחנו מציגים מערכת אלקטרונית כמו עור שמספקת מיפוי של condu טמפרטורה ותרמית מדויק, בזמן אמתctivity ומספק רמה מדויקת של חימום באתרי פצע באמצעות למינציה קונפורמי של המכשיר הלא פולשני. מכשיר זה מציג סוג של טכנולוגיה, מערכות רכוב עור אפידרמיס אלקטרוניות שנועדו להתאים לתכונות מכאניות וחומר (עובי כולל, כיפוף קשיחות, moduli היעיל, וצפיפות מסה) של האפידרמיס 6-9. המכשיר נועד במים, מגינים ביולוגית, ידידותי לעור, וטופס לשימוש חוזר שניתן לכבס וחיטוי ליישומים קליניים בחולים 10. המכשיר האלקטרוני קונפורמי רכוב ליד רקמות הפצע לוכד את שלב הדלקת (אחד של תהליך ריפוי פצע), הנגרם על ידי זרימת דם מוגברת ותגובות אנזימטיות לפצע 11,12, באמצעות הקלטת כמותי של טמפרטורה 8 ומוליכות תרמית 13, בקורלציה ללחות . מחקרי ניסויים וחישובים לקבוע עיצוב מכניקה אופטימלי לaccommodאכלתי תנועות טבעיות ולהחיל זנים ללא שבר מכאני וללכוד את הפיזיקה הבסיסית של מתיחת מכניקה של האלקטרוניקה כמו העור שlaminates conformally על פני העור, המציע רכישה של אותות נאמנות גבוהים. הפרוטוקולים מתוארים במאמר זה יציגו את השיטות של microfabrication למערכות אלקטרוניות כמו עור, בדיקת הכנה כוללים ניקוי מכשיר, התקנת ציוד בהגדרה קלינית, ויישומים קליניים לניטור כמותי של טמפרטורה ומוליכות תרמית על פצעים עוריים.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>3&#34; Silicon wafer</td>
			<td>University Wafer, USA</td>
			<td>N/A</td>
			<td>Use as carrier to fabricate the device</td>
		</tr>
		<tr>
			<td>Acetone</td>
			<td>Fisher Scientific, USA</td>
			<td>A18-1</td>
			<td>Use to clean a wafer and to remove photoresist</td>
		</tr>
		<tr>
			<td>Isopropanol (IPA)</td>
			<td>Fisher Scientific, USA</td>
			<td>A459-1</td>
			<td>Use to clean a wafer</td>
		</tr>
		<tr>
			<td>AZ4620 photoresist</td>
			<td>AZ Electrionic Materials, USA</td>
			<td>N/A</td>
			<td>Use to make patterns on metals and polymers</td>
		</tr>
		<tr>
			<td>AZ400K developer</td>
			<td>AZ Electrionic Materials, USA</td>
			<td>N/A</td>
			<td>Use to develop AZ4620 photoresist</td>
		</tr>
		<tr>
			<td>Chromium etchant</td>
			<td>Transene, USA</td>
			<td>1020AC</td>
			<td>Use to etch Cr layer of device</td>
		</tr>
		<tr>
			<td>Copper etchant</td>
			<td>Transene, USA</td>
			<td>ASP-100</td>
			<td>Use to etch Cu layer of device</td>
		</tr>
		<tr>
			<td>Sylgard 184 Silicone Elastomer Kit (PDMS)</td>
			<td>Dow Corning, USA</td>
			<td>39100000</td>
			<td>Use as a substrate for &#39;dry&#39; retrieval</td>
		</tr>
		<tr>
			<td>PI2545 polyimide</td>
			<td>HD MicroSystem, USA</td>
			<td>N/A</td>
			<td>Use to encapsulate metal layer</td>
		</tr>
		<tr>
			<td>Solaris</td>
			<td>Smooth-On, USA</td>
			<td>N/A</td>
			<td>Use as substrate and to encapsulate device</td>
		</tr>
		<tr>
			<td>Petridish</td>
			<td>Carolina, USA</td>
			<td>741255</td>
			<td>Use as mold to make substrate</td>
		</tr>
		<tr>
			<td>Water-Soluble Wave Solder Tape 5414</td>
			<td>3M, USA</td>
			<td>AM000000217</td>
			<td>Use to retrive device from PDMS layer</td>
		</tr>
		<tr>
			<td>High Activity Liquid Stainless Steel Flux</td>
			<td>Worthington, USA</td>
			<td>331929</td>
			<td>Use to remove oxidation layer on Cu</td>
		</tr>
		<tr>
			<td>Flexible, micro-film cable</td>
			<td>Elform, USA</td>
			<td>N/A (customized)</td>
			<td>Use to make the electrical connection between the electronic device and the data acquisition system</td>
		</tr>
		<tr>
			<td>pH Neutral Cleaner</td>
			<td>Australian Gold, USA</td>
			<td>N/A</td>
			<td>Use as disinfectant solution to clean device in clinical testing</td>
		</tr>
		<tr>
			<td>Solder</td>
			<td>Kester, USA</td>
			<td>24-6337-9703</td>
			<td>Use as material to solder hard wires</td>
		</tr>
		<tr>
			<td>Ultraviolet lamp</td>
			<td>Cole-Parmer, USA</td>
			<td>97600-00</td>
			<td>Use to activate PDMS layer as hydrophilic surface</td>
		</tr>
		<tr>
			<td>Multiplexer</td>
			<td>FixYourBoard, USA</td>
			<td>U802</td>
			<td>Use to acquire measurements from six sensing components&#160;</td>
		</tr>
		<tr>
			<td>DC/AC current source</td>
			<td>Keithley, USA</td>
			<td>6221</td>
			<td>Use to supply current</td>
		</tr>
		<tr>
			<td>SMD Digital Hot Air Rework Station</td>
			<td>Aoyue, China</td>
			<td>968A+</td>
			<td>Use to solder hard wires, to electrically connect between the device and external instruments</td>
		</tr>
		<tr>
			<td>Infrared camera</td>
			<td>FLIR, USA</td>
			<td>435-0001-01-00</td>
			<td>Use to take infrared images in experiment</td>
		</tr>
		<tr>
			<td>Digital multimeter</td>
			<td>Fluke, USA</td>
			<td>117</td>
			<td>Use to check electrical connection</td>
		</tr>
		<tr>
			<td>Lock-in amplifier</td>
			<td>Stanford Research System, USA</td>
			<td>SR830</td>
			<td>Use to perform four-point-probe-measurement</td>
		</tr>
		<tr>
			<td>Electron beam evaporator</td>
			<td>9 scale Vacuum Products, USA</td>
			<td>N/A (customized)</td>
			<td>Use to deposit thin films (Cu and SiO2)</td>
		</tr>
	</tbody>
</table>

fabrication and characterization of a conformal skin-like electronic system for quantitative, cutaneous wound management

Recent advances in the development of electronic technologies and biomedical devices offer opportunities for non-invasive, quantitative assessment of cutaneous wound healing on the skin. Existing methods, however, still rely on visual inspections through various microscopic tools and devices that normally include high-cost, sophisticated systems and require well trained personnel for operation and data analysis. Here, we describe methods and protocols to fabricate a conformal, skin-like electronics system that enables conformal lamination to the skin surface near the wound tissues, which provides recording of high fidelity electrical signals such as skin temperature and thermal conductivity. The methods of device fabrication provide details of step-by-step preparation of the microelectronic system that is completely enclosed with elastomeric silicone materials to offer electrical isolation. The experimental study presents multifunctional, biocompatible, waterproof, reusable, and flexible/stretchable characteristics of the device for clinical applications. Protocols of clinical testing provide an overview and sequential process of cleaning, testing setup, system operation, and data acquisition with the skin-like electronics, gently mounted on hypersensitive, cutaneous wound and contralateral tissues on patients.

איור 1 מציג סקירה של המאפיינים של קונפורמי, המערכת האלקטרונית כמו העור, מיועדים לכמותיים, ניהול פצע עורית על חולים. המכשיר האלקטרוני רב תכליתי מורכב ממבני פרקטל microscale 3,14 ומתפתל filamentary עקבות 9,17 על קרום דק אלסטומרי שמציע להימתח מכאני יוצא דופן וbendabi...

Watch this Scientific Journal Video about Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management at JoVE.com

Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management

This article presents methods to fabricate and characterize a conformal, skin-like electronic system and protocols for the use in clinical applications, particularly on cutaneous wound management.

ייצור ואפיון של מערכת אלקטרונית כמו-עור קונפורמי לניהול כמותי, עורית פצע

Recent advances in the development of electronic technologies and biomedical devices offer opportunities for non-invasive, quantitative assessment of ...

fabrication-characterization-conformal-skin-like-electronic-system

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Bioengineering

8.8K Views.  Virginia Commonwealth University. This article presents methods to fabricate and characterize a conformal, skin-like electronic system and protocols for the use in clinical applications, particularly on cutaneous wound management. 

Video: Fabrication and Characterization of a Conformal Skin-like Electronic System for Quantitative, Cutaneous Wound Management

Microinjection Wound Assay and In vivo Localization of Epidermal Wound Response Reporters in Drosophila Embryos.

The Drosophila embryo develops a robust epidermal layer that serves both to protect the internal cells from a harsh external environment as well as to maintain cellular homeostasis. Puncture injury with glass needles provides a direct method to trigger a rapid epidermal wound response that activates wound transcriptional reporters, which can be visualized by a localized reporter signal in living embryos or larvae. Puncture or laser injury also provides signals that promote the recruitment of hemocytes to the wound site. Surprisingly, severe (through and through) puncture injury in late stage embryos only rarely disrupts normal embryonic development, as greater than 90% of such wounded embryos survive to adulthood when embryos are injected in an oil medium that minimizes immediate leakage of hemolymph from puncture sites. The wound procedure does require micromanipulation of the Drosophila embryos, including manual alignment of the embryos on agar plates and transfer of the aligned embryos to microscope slides. The Drosophila epidermal wound response assay provides a quick system to test the genetic requirements of a variety of biological functions that promote wound healing, as well as a way to screen for potential chemical compounds that promote wound healing. The short life cycle and easy culturing routine make Drosophila a powerful model organism. Drosophila clean wound healing appears to coordinate the epidermal regenerative response, with the innate immune response, in ways that are still under investigation, which provides an excellent system to find conserved regulatory mechanisms common to Drosophila and mammalian epidermal wounding.

Microinjection Wound Assay and In vivo Localization of Epidermal Wound Response Reporters in Drosophila Embryos.

The embryonic epidermis of very late stage Drosophila embryos provides an in vivo system for rapid puncture wound response analysis and can be combined with genetic manipulations or chemical microinjection treatments to advance studies in wound healing for translation into mammalian models.

Assay וMicroinjection פצע<em&gt; בvivo</em&gt; לוקליזציה של עוריות פצע הכתבים תגובה ב<em&gt; דרוזופילה</em&gt; עוברים.

The Drosophila embryo develops a robust epidermal layer that serves both to protect the internal cells from a harsh external environment as well as to ...

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

A &#8220;sheath&#8221; fluid passing through a microfluidic channel at low Reynolds number can be directed around another &#8220;core&#8221; stream and used to dictate the shape as well as the diameter of a core stream.&#160;Grooves in the top and bottom of a microfluidic channel were designed to direct the sheath fluid and shape the core fluid.&#160;By matching the viscosity and hydrophilicity of the sheath and core fluids, the interfacial effects are minimized and complex fluid shapes can be formed.&#160;Controlling the relative flow rates of the sheath and core fluids determines the cross-sectional area of the core fluid.&#160;Fibers have been produced with sizes ranging from 300 nm to ~1 mm, and fiber cross-sections can be round, flat, square, or complex as in the case with double anchor fibers. Polymerization of the core fluid downstream from the shaping region solidifies the fibers.&#160;Photoinitiated click chemistries are well suited for rapid polymerization of the core fluid by irradiation with ultraviolet light.&#160;Fibers with a wide variety of shapes have been produced from a list of polymers including liquid crystals, poly(methylmethacrylate), thiol-ene and thiol-yne resins, polyethylene glycol, and hydrogel derivatives. Minimal shear during the shaping process and mild polymerization conditions also makes the fabrication process well suited for encapsulation of cells and other biological components.

Two adjacent fluids passing through a grooved microfluidic channel can be directed to form a sheath around a prepolymer core; thereby&#160;determining both shape and cross-section. Photoinitiated polymerization, such as thiol click chemistry, is well suited for rapidly solidifying the core fluid into a microfiber with predetermined size and shape.

ייצור מיקרופלואידי של סיבים פולימריים וביוהיברידים עם גודל וצורה מעוצבים מראש

A &#8220;sheath&#8221; fluid passing through a microfluidic channel at low Reynolds number can be directed around another &#8220;core&#8221; stream and ...

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

Microfluidic processing of biological samples typically involves differential manipulations of suspended particles under various force fields in order to spatially fractionate the sample based on a biological property of interest. For the resultant spatial distribution to be used as the assay readout, microfluidic devices are often subjected to microscopic analysis requiring complex instrumentation with higher cost and reduced portability. To address this limitation, we have developed an integrated electronic sensing technology for multiplexed detection of particles at different locations on a microfluidic chip. Our technology, called Microfluidic CODES, combines Resistive Pulse Sensing with Code Division Multiple Access to compress 2D spatial information into a 1D electrical signal. In this paper, we present a practical demonstration of the Microfluidic CODES technology to detect and size cultured cancer cells distributed over multiple microfluidic channels. As validated by the high-speed microscopy, our technology can accurately analyze dense cell populations all electronically without the need for an external instrument. As such, the Microfluidic CODES can potentially enable low-cost integrated lab-on-a-chip devices that are well suited for the point-of-care testing of biological samples.

We demonstrate a microfluidic platform with an integrated surface electrode network that combines resistive pulse sensing (RPS) with code division multiple access (CDMA), to multiplex detection and sizing of particles in multiple microfluidic channels.

פלטפורמת microfluidic עם איתור Multiplexed אלקטרוני למערכות מעקב מרחבית של חלקיקים

Microfluidic processing of biological samples typically involves differential manipulations of suspended particles under various force fields in order to ...

A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

Today, wearable electronics devices combine a large variety of functional, stretchable, and flexible technologies. However, in many cases, these devices cannot be worn under everyday conditions. Therefore, textiles are commonly considered the best substrate to accommodate electronic devices in wearable use. In this paper, we describe how to selectively pattern organic electroactive materials on textiles from a solution in an easy and scalable manner. This versatile deposition technique enables the fabrication of wearable organic electronic devices on clothes.

In this paper, we present a protocol to selectively deposit organic materials on textiles, which allows for the direct integration of organic electronic devices with wearables. The fabricated devices can be fully integrated in textiles, respecting their mechanical appearance and enabling sensing capabilities.

שיטת ייצור פשוט Scalable עבור מכשירים אלקטרוניים אורגניים על טקסטיל

Today, wearable electronics devices combine a large variety of functional, stretchable, and flexible technologies. However, in many cases, these devices ...

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Organs-on-chips, in vitro models involving the culture of (human) tissues inside microfluidic devices, are rapidly emerging and promise to provide useful research tools for studying human health and disease. To characterize the barrier function of cell layers cultured inside organ-on-chip devices, often transendothelial or transepithelial electrical resistance (TEER) is measured. To this end, electrodes are usually integrated into the chip by micromachining methods to provide more stable measurements than is achieved with manual insertion of electrodes into the inlets of the chip. However, these electrodes frequently hamper visual inspection of the studied cell layer or require expensive cleanroom processes for fabrication. To overcome these limitations, the device described here contains four easily integrated electrodes that are placed and fixed outside of the culture area, making visual inspection possible. Using these four electrodes the resistance of six measurement paths can be quantified, from which the TEER can be directly isolated, independent of the resistance of culture medium-filled microchannels. The blood-brain barrier was replicated in this device and its TEER was monitored to show the device applicability. This chip, the integrated electrodes and the TEER determination method are generally applicable in organs-on-chips, both to mimic other organs or to be incorporated into existing organ-on-chip systems.

This publication describes the fabrication of an organ-on-chip device with integrated electrodes for direct quantification of transendothelial electrical resistance (TEER). For validation, the blood-brain barrier was mimicked inside this microfluidic device and its barrier function was monitored. The presented methods for electrode integration and direct TEER quantification are generally applicable.

ייצור ואימות מערכת איברים על שבב עם אלקטרודות משולבת ישירות לכמת התנגדות חשמלית Transendothelial

Organs-on-chips, in vitro models involving the culture of (human) tissues inside microfluidic devices, are rapidly emerging and promise to provide useful ...

Fabrication and Characterization of Griffithsin-modified Fiber Scaffolds for Prevention of Sexually Transmitted Infections

Electrospun fibers (EFs) have been widely used in a variety of therapeutic applications; however, they have only recently been applied as a technology to prevent and treat sexually transmitted infections (STIs). Moreover, many EF technologies focus on encapsulating the active agent, relative to utilizing the surface to impart biofunctionality. Here we describe a method to fabricate and surface-modify poly(lactic-co-glycolic) acid (PLGA) electrospun fibers, with the potent antiviral lectin Griffithsin (GRFT). PLGA is an FDA-approved polymer that has been widely used in drug delivery due to its outstanding chemical and biocompatible properties. GRFT is a natural, potent, and safe lectin that possesses broad activity against numerous viruses including human immunodeficiency virus type 1 (HIV-1). When combined, GRFT-modified fibers have demonstrated potent inactivation of HIV-1 in vitro. This manuscript describes the methods to fabricate and characterize GRFT-modified EFs. First, PLGA is electrospun to create a fiber scaffold. Fibers are subsequently surface-modified with GRFT using 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS)chemistry. Scanning electron microscopy (SEM) was used to assess the size and morphology of surface-modified formulations. Additionally, a gp120 or hemagglutinin (HA)-based ELISA may be used to quantify the amount of GRFT conjugated to, as well as GRFT desorption from the fiber surface. This protocol can be more widely applied to fabricate fibers that are surface-modified with a variety of different proteins.

This manuscript describes the procedure to fabricate and characterize Griffithsin-modified poly(lactic-co-glycolic acid) electrospun fibers that demonstrate potent adhesive and antiviral activity against human immunodeficiency virus type 1 infection in vitro. Methods used to synthesize, surface-modify, and characterize the resulting morphology, conjugation, and desorption of Griffithsin from surface-modified fibers are described.

ייצור ואפיון של סיבים Griffithsin-השתנה פיגומים לצורך מניעת מחלות המועברות

Electrospun fibers (EFs) have been widely used in a variety of therapeutic applications; however, they have only recently been applied as a technology to ...

Large-area Scanning Probe Nanolithography Facilitated by Automated Alignment and Its Application to Substrate Fabrication for Cell Culture Studies

Scanning probe microscopy has enabled the creation of a variety of methods for the constructive (&#39;additive&#39;) top-down fabrication of nanometer-scale features. Historically, a major drawback of scanning probe lithography has been the intrinsically low throughput of single probe systems. This has been tackled by the use of arrays of multiple probes to enable increased nanolithography throughput. In order to implement such parallelized nanolithography, the accurate alignment of probe arrays with the substrate surface is vital, so that all probes make contact with the surface simultaneously when lithographic patterning begins. This protocol describes the utilization of polymer pen lithography to produce nanometer-scale features over centimeter-sized areas, facilitated by the use of an algorithm for the rapid, accurate, and automated alignment of probe arrays. Here, nanolithography of thiols on gold substrates demonstrates the generation of features with high uniformity. These patterns are then functionalized with fibronectin for use in the context of surface-directed cell morphology studies.

Here we present a protocol for wide-area scanning probe nanolithography enabled by the iterative alignment of probe arrays, as well as the utilization of lithographic patterns for cell-surface interaction studies.

ננוליתוגרפיה בדיקה סריקת שטח גדול בהנחייתם של יישור אוטומטי ויישומו המצע פבריקציה נוספת ללימודי תרבות תא

Scanning probe microscopy has enabled the creation of a variety of methods for the constructive (&#39;additive&#39;) top-down fabrication of ...

Fabrication and Characterization of Optical Tissue Phantoms Containing Macrostructure

The rapid development of new optical imaging techniques is dependent on the availability of low-cost, customizable, and easily reproducible standards. By replicating the imaging environment, costly animal experiments to validate a technique may be circumvented. Predicting and optimizing the performance of in vivo and ex vivo imaging techniques requires testing on samples that are optically similar to tissues of interest. Tissue-mimicking optical phantoms provide a standard for evaluation, characterization, or calibration of an optical system. Homogenous polymer optical tissue phantoms are widely used to mimic the optical properties of a specific tissue type within a narrow spectral range. Layered tissues, such as the epidermis and dermis, can be mimicked by simply stacking these homogenous slab phantoms. However, many in vivo imaging techniques are applied to more spatially complex tissue where three dimensional structures, such as blood vessels, airways, or tissue defects, can affect the performance of the imaging system. 
This protocol describes the fabrication of a tissue-mimicking phantom that incorporates three-dimensional structural complexity using material with optical properties of tissue. Look-up tables provide India ink and titanium dioxide recipes for optical absorption and scattering targets. Methods to characterize and tune the material optical properties are described. The phantom fabrication detailed in this article has an internal branching mock airway void; however, the technique can be broadly applied to other tissue or organ structures.

Optical tissue phantoms are essential tools for calibration and characterization of optical imaging systems and validation of theoretical models. This article details a method for phantom fabrication that includes replication of tissue optical properties and three-dimensional tissue structure.

ייצור ואפיון רקמות אופטי הפאנטומים המכיל למפלגות

The rapid development of new optical imaging techniques is dependent on the availability of low-cost, customizable, and easily reproducible standards. By ...

Detection of Endotoxin in Nano-formulations Using Limulus Amoebocyte Lysate (LAL) Assays

When present in pharmaceutical products, a Gram-negative bacterial cell wall component endotoxin (often also called lipopolysaccharide) can cause inflammation, fever, hypo- or hypertension, and, in extreme cases, can lead to tissue and organ damage that may become fatal. The amounts of endotoxin in pharmaceutical products, therefore, are strictly regulated. Among the methods available for endotoxin detection and quantification, the Limulus Amoebocyte Lysate (LAL) assay is commonly used worldwide. While any pharmaceutical product can interfere with the LAL assay, nano-formulations represent a particular challenge due to their complexity. The purpose of this paper is to provide a practical guide to researchers inexperienced in estimating endotoxins in engineered nanomaterials and nanoparticle-formulated drugs. Herein, practical recommendations for performing three LAL formats including turbidity, chromogenic and gel-clot assays are discussed. These assays can be used to determine endotoxin contamination in nanotechnology-based drug products, vaccines, and adjuvants.

Detection of Endotoxin in Nano-formulations Using Limulus Amoebocyte Lysate LAL Assays

Detection of endotoxins in engineered nanomaterials represents one of the grand challenges in the field of nanomedicine. Here, we present a case study that describes the framework composed of three different LAL formats to estimate potential endotoxin contamination in nanoparticles.

זיהוי של אנדוטוקסין ניסוחים-Nano באמצעות מבחני Lysate (LAL) Amoebocyte Limulus

When present in pharmaceutical products, a Gram-negative bacterial cell wall component endotoxin (often also called lipopolysaccharide) can cause ...

Focused Ion Beam Lithography to Etch Nano-architectures into Microelectrodes

With advances in electronics and fabrication technology, intracortical microelectrodes have undergone substantial improvements enabling the production of sophisticated microelectrodes with greater resolution and expanded capabilities. The progress in fabrication technology has supported the development of biomimetic electrodes, which aim to seamlessly integrate into the brain parenchyma, reduce the neuroinflammatory response observed after electrode insertion and improve the quality and longevity of electrophysiological recordings. Here we describe a protocol to employ a biomimetic approach recently classified as nano-architecture. The use of focused ion beam lithography (FIB) was utilized in this protocol to etch specific nano-architecture features into the surface of non-functional and functional single shank intracortical microelectrodes. Etching nano-architectures into the electrode surface indicated possible improvements of biocompatibility and functionality of the implanted device. One of the benefits of using FIB is the ability to etch on manufactured devices, as opposed to during the fabrication of the device, facilitating boundless possibilities to modify numerous medical devices post-manufacturing. The protocol presented herein can be optimized for various material types, nano-architecture features, and types of devices. Augmenting the surface of implanted medical devices can improve the device performance and integration into the tissue.

We have shown that the etching of nano-architecture into intracortical microelectrode devices may reduce the inflammatory response and has the potential to improve electrophysiological recordings. The methods described herein outline an approach to etch nano-architectures into the surface of non-functional and functional single shank silicon intracortical microelectrodes.

ליתוגרפיה של קרן יון ממוקדת לחרוט ננו-ארכיטקטורות למיקרואלקטרודות

With advances in electronics and fabrication technology, intracortical microelectrodes have undergone substantial improvements enabling the production of ...