Unreferenced date December 2009 Orphan date December 2009 An overlayassay is a Biology biological technique used to find protein s that bind to a protein of interest. It begins with proteins that are dispersed but fixed e.g. a tissue slice or run on a membrane by gel electrophoresis and then incubated in the labelled protein of interest. The label will indicate the location of proteins that bind to the protein of interest. DEFAULTSORT OverlayAssay Category Laboratory techniques ... more details
wiktionarypar overlayOverlay may refer to Overlay architecture , term used to describe event architecture and relates to the temporary elements that supplement existing buildings and infrastructure to enable the operation of major sporting events or festivals. Overlay Control in semiconductor manufacturing, for monitoring layer to layer alignment on multi layer device structures. Video overlay , techniques to display video on computer display. Hardware overlay , one type of video overlay that uses memory dedicated to the application. Overlay programming , a technique to reduce the amount of memory used by a program. Overlay operating system , replacing one process by another Historic overlay district , a zoning district that applies special rules to a portion of other districts, usually for historic or conservation reasons. Overlay network , a computer network which is built on top of another network Overlay plan , a method of introducing new area codes in telephony Overlay keyboard , a specialized keyboard with no pre set keys Keyboard overlay , a sheet of printed text sitting between the keys, depicting an alternate keyboard layout An overlay in gambling is where the bettor thinks the odds given are too generous disambig de Overlay ja ko ... more details
, coins metallurgical assay the Communes of France commune in the Indre et Loire Assay, Indre et Loire Wiktionary assay An assay is an investigative analytic procedure in laboratory medicine ... . Second edition. Oxford University Press 2005. ref Generally in an assay the quantity of the exogenous ... is the only limiting factor for the reaction assay process, and the difference in the assay ... more complex either in composition or in behavior or both. Thus reading of an assay may be quite ..., or some descriptive change in some body part of a group of animals . An assay analysis is never an isolated ... request to perform an assay and further information processing or specimen handling eg collection transport and processing done before and till the point of beginning of an assay are the preanalytic steps. Similarly after the actual assay is done the result may be documented, verified and transmitted communicated in steps which are called post analytic steps related to an assay. Like any multistep ... final results of an assay involves corresponding parts in every such step ie not only analytic variations and errors intrinsic to the assay itself but also variations and errors involved in preanalytic and post analytic steps. Since the assay itself the analytic step gets a lot of attention ... in organizing the procedure, right from ordering of an assay, to pre analytic sample processing sample ... their results and utility may or may not be comparable depending on the natures of the assay and their methodology ..., especially to remain legally acceptable and accountable for the quality of the assay results and also to convince customers to use their assay commercially professionally. Etymology According to Etymology Online ref http www.etymonline.com index.php?term assay ref the verb assay, at least since the 13th ... n. , from O.Fr. essai trial . And the noun assay thus means trial, test of quality, test of character, mid 14c., from Anglo Fr. assai and Meaning analysis is from late 14c. For Metallurgical assayassay ... more details
confused Keyboard overlay An overlay keyboard is a specialized Computer keyboard keyboard with no pre set keys. Each key can be programmed with a wide range of different functions. Overlay keyboards are often used as a quick and easy way to input items with just two buttons. Overlay keyboards generally consist of a flat grid of unmarked buttons. After the keyboard is programmed, a sheet, called an overlay, is placed overtop to identify each key. The overlay can consist of any combination of words, symbols, or even pictures. Advantages Overlay keyboards have several advantages over Computer keyboard conventional keyboards or Mouse computing mice . They do not require memorization of shortcut keys i.e. F5, Alt S, etc. nor do they require a great deal of fine motor control, making them ideal for people who have difficulty using a conventional keyboard. Overlay keyboards are easy to clean, and are much more resistant to spills or dust. The ability to change overlay sheets also makes it easy for a single overlay keyboard to have several different uses. Usage Overlay keyboards are probably most often found in fast food restaurants, where they reduce the amount of time required to enter items. Overlay keyboards are also used in education, especially at the primary level. They can also be used by disabled people who have sensory or motor control difficulties. ref P. Blenkhorn, http www.dinf.ne.jp doc english Us Eu conf csun 98 csun98 014.html Switch, overlay keyboard and touch screen software for children and adults with profound and multiple disabilities , Feb. 24, 1998, accessed Sept. 22, 2007 ref ref http www.overlaykeyboard.com Everything You Need to Know about Overlay Keyboards , accessed 29 July 2009 ref References references Compu hardware stub Category Computer keyboards ... more details
A Heritage Overlay or HO is one of a number of planning scheme overlay s contained in the Victorian Planning Provisions , for use in planning scheme s in Victoria, Australia Victoria , Australia. The heritage overlay schedule of each Local Government Areas of Victoria local government planning scheme lists sites of local and state significance Victorian Heritage Register but does not include sites on the Australian National Heritage List . The Heritage Overlay is used to protect sites that have Cultural heritage heritage value, meaning that individual buildings or whole urban precincts may be covered. The protection afforded by a Heritage Overlay varies in each instance, though the controls apply to built structures and their associated land. The minimum level of protection is afforded by the mere existence of the overlay and means that any work at all to the building or site will require ... or an incorporated plan listed in the schedule to the overlay. Each planning scheme will have a set of maps which indicate the location of overlay controls. Associated with the maps is a schedule listing every individual overlay in that planning scheme according to the following criteria Planning ... heritage An easy to follow description of how to read a heritage overlay and the different related ... What is a Heritage Overlay index.aspx City of Ballarat Website What is a Heritage Overlay and http ... overlay .aspx City of Ballarat How do you read the Heritage Overlay . See also Burra Charter References ... and Planning Heritage HeritageInfo What is a Heritage Overlay index.aspx City of Ballarat What is a Heritage Overlay http www.ballarat.vic.gov.au heritage what we do heritage planning protection how do you read the heritage overlay .aspx City of Ballarat How do you read the Heritage Overlay http google.com search?q cache PbakP71i gUJ www.dse.vic.gov.au planningschemes aavpp 43 01.pdf 22heritage overlay 22&hl en&ct clnk&cd 3&gl au Heritage Overlay Provisions at Victorian Department of Sustainability ... more details
An overlay network is a computer network which is built on the top of another network. Node networking Node s in the overlay can be thought of as being connected by virtual or logical links, each of which ... are overlay networks because their nodes run on top of the Internet . The Internet was built as an overlay ... Morris R. Morris . http nms.csail.mit.edu ron Resilient Overlay Networks . In Proc. ACM SOSP, Oct. 2001. ref Uses of overlay networks In telecommunication File Network Overlay merged.svg thumb upright 1.5 Figure 1 A sample overlay network File Network Overlay.svg thumb upright 1.5 Figure 2 Overlay network broken up into logical layers Overlay networks are used in telecommunication because of the availability ... 2001 2002 . From a physical standpoint overlay networks are quite complex see Figure 1 as they combine ... to a node having a specific logical address , whose IP address is not known in advance. Overlay networks ... router computing router s in the network. On the other hand, an overlay network can be incrementally deployed on end hosts running the overlay protocol software, without cooperation from Internet service provider ISPs . The overlay has no control over how packets are routed in the underlying network between two overlay nodes, but it can control, for example, the sequence of overlay nodes a message traverses before reaching its destination. For example, Akamai Technologies manages an overlay ... includes http esm.cs.cmu.edu End System Multicast and Overcast for multicast RON Resilient Overlay Network ..., Virtela Technology Services ref http www.virtela.net Virtela Technology Services ref provides an overlay network in 90 countries on top of 500 different underlying telecom providers. List of overlay network protocols Overlay network protocols based on TCP IP include Distributed hash table s DHTs ... for massively shared virtual world HyParView a higly robust unstructured overlay for gossip broadcast Overlay network protocols based on UDP IP include Real Time Media Flow Protocol Adobe Flash ... more details
Orphan date February 2009 Context date October 2009 Silicon wafers are currently manufactured in a sequence of steps, each stage placing a pattern of material on the wafer in this way transistors, contacts, etc., all made of different materials, are laid down. In order for the final device to function correctly, these separate patterns must be aligned correctly for example contacts, lines and transistors must all line up. Overlay control is the term used to define the control of this pattern to pattern alignment. It has always played an important role in Semiconductor device fabrication semiconductor manufacturing , helping to monitor layer to layer alignment on multi layer device structures. Misalignment of any kind can cause short circuits and connection failures, which in turn impact Foundry electronics fab yield and profit margins. Overlay control has become even more critical now because the combination of increasing pattern density and innovative techniques such as double patterning and 193 nm immersion lithography creates a novel set of pattern based yield challenges at the 45 nm technology node and below. This combination causes error budgets to shrink below 30 percent of design rules, where existing overlay metrology solutions cannot meet total measurement uncertainty TMU requirements. Overlay metrology solutions with both higher measurement accuracy precision and process robustness are key factors when addressing increasingly tighter overlay budgets. Higher order overlay control and in field metrology using smaller, micro grating or other novel targets are becoming essential for successful production ramps and higher yields at 45 nm and beyond. Examples of the widely adopted overlay measurement tools worldwide are KLA Tencor s ARCHER http www.kla tencor.com archer , and the nanometrics http www.nanometrics.com CALIPER series, overlay metrology platforms. Category Semiconductor device fabrication de Overlay Halbleitertechnik ... more details
Video overlay is any technique used to display a video window on a computer display while bypassing the chain of Central processing unit CPU video card graphics card computer monitor . This is done in order to speed up the video display, and it is commonly used, for example, by TV tuner card s and early 3D graphics accelerator cards. The term is also used to describe the annotation or inclusion of interactivity on online videos, such as overlay advertising mid roll overlay . Various methods to achieve video overlay are in use A video overlay device can be connected between the graphics card analog Video Graphics Array VGA output and the monitor s input forming a VGA passthrough . The device modifies the VGA signal and inserts the analog video signal overlay into the picture the rest of the screen is filled by the signal coming from the graphics card. The driver software informs the video overlay device about the desired position of the video window on screen. Because of the much greater processing power of modern graphics cards, and the awkwardness of adding additional analog hardware signal processing path, this method is now little used. Some video overlay devices write the digital video signal directly into the graphics card s video memory or provide it to the graphics card s RAMDAC . Hardware overlay is a technique implemented by most modern graphics cards that allows an application to write to a dedicated part of video memory, rather than to the part shared by all applications. In this way, clipping computer graphics clipping , moving and scaling of the image can be performed ... systems now include a hardware overlay, which uses dedicated video processing hardware built into the main ... configured as a frame buffer which is used to store the graphics. Overlay advertising is a technique used by online video producers to monetize video content through using an overlay layer to deliver ... of the video and or the target of the link being placed. See also Hardware overlay Texture mapping ... more details
Overlay is a term that is used to describe event architecture and relates to the temporary elements that supplement existing buildings and infrastructure to enable the operation of major sporting events or festivals. These elements provide additional facilities for the duration of an event and are generally of a lightweight construction, as they are often removed afterwards. The role of overlay is extensive and can cover all aspects of a major event, starting with the back of house user groups, including staff, operations, officials, broadcast, media, hospitality, VIPs and the athletes themselves. These groups all require physical facilities to provide accreditation, accommodation, segregation and wayfinding, which need to be separated from, but connected to, the spectators at the front of house , to preserve the magic and mystery of the event experience. It is important that the overlay design is integrated into the masterplan of major events at an early stage, in order that the flow of people through the site can be effectively managed and sufficient space provided for the various overlay facilities. The overlay design also has a significant role in helping to define the overall environment of a major event. The aim is to treat temporary places and spaces with the same attention that would be applied to their permanent equivalents, to deliver a coherent temporary environment. By taking ... the key figure in Overlay design. Overlay categories Overlay can be categorised in three main ways Existing facilities the overlay consists of temporary elements being added to an existing space to accommodate ... the overlay consists of temporary elements that are integrated with permanent elements in a new ... 2014 Olympic Stadium Temporary facilities the overlay creates a completely temporary facility or venue ... Park, for the 2012 Olympic Games Overlay, London 2012 For the London 2012 Olympic Games, Populous architects Populous is the official architectural and overlay design services provider and their commitment ... more details
About dividing a program up to reduce memory requirements the complete replacement of a process Overlay operating system In a general computing sense, overlaying means replacement of a block of stored instructions or data with another. ref cite web date February 19, 2007 url http www.askoxford.com concise oed overlay 1?view uk title Oxford Dictionaries ref Overlaying is a computer programming programming method that allows programs to be larger than the computer s main memory . An embedded system would normally use overlays because of the limitation of physical memory , which is internal memory for a system on chip and the lack of virtual memory facilities. Usage Constructing an overlay program ... overlay region or destination region . An overlay manager, either part of the operating system or part of the overlay program, loads the required overlay from external memory into its destination ... date June 3, 2008 url http sourceware.org binutils docs ld Overlay Description.html title The GNU Linker documentation Overlay Description ref Example The following example shows the control statements that instruct the OS 360 Linkage Editor to link an overlay program, indented to show structure pre INCLUDE SYSLIB MOD1 INCLUDE SYSLIB MOD2 OVERLAY A INCLUDE SYSLIB MOD3 OVERLAY AA INCLUDE SYSLIB MOD4 INCLUDE SYSLIB MOD5 OVERLAY AB INCLUDE SYSLIB MOD6 OVERLAY B INCLUDE SYSLIB MOD7 pre pre Root Segment MOD1, MOD2 Overlay A Overlay B MOD3 MOD7 Overlay AA Overlay AB MOD4, MOD5 MOD6 pre These statements ... A and B which will be loaded following the end of MOD2. Overlay A itself consists of two overlay segments ... and a given overlay segment are called a path . Applications As of 2007 , most business applications ... without the added design difficulty of forcing the processing into steps constrained by the overlay ... Paging Category Virtual memory comp sci stub cs P ekryvn modul hu Overlay technika ja ru Overlay ... more details
An overlay journal or overlay ejournal is a term for a specific type of Open access journal open access academic journal , almost always an online electronic journal ejournal . Such a journal does not produce its own content, but carefully selects from texts that are already freely available online. While many overlay journals derive their content from preprint servers, others, such as the Lund Medical Faculty Monthly, contain mainly papers published by commercial publishers but with links to self archived pre or post prints when possible. The editors of such a journal locate suitable material from open access repositories and public domain sources, read it, and evaluate its worth. This evaluation may take the form of the judgement of a single editor or editors, or a full peer review process. Public validation of subsequently approved texts may take several forms. At its most formal, the editor may republish the article with explicit approval. Approval might take the form of an addition to the text or its metadata . Or the editor may simply link to the article, via the table of contents of the overlay journal. An alternative approach is to link to articles already published in various open access ejournals, but adding value by grouping scattered articles together as a single themed issue of the overlay journal. Such themed issues allow the focussed coverage of relatively obscure or newly emerging topics. References http www.open video.org details.php?videoid 10100 Open Video Project Overlay Journal prototype demonstration 2006 http www.dlib.org dlib september07 09inbrief.html Investigating overlay journals introducing the RIOJA Project . D Lib Magazine . September October 2007 http www.lmfm.med.lu.se Lund Medical Faculty Monthly Category Academic publishing Overlay journal Category Electronic publishing ... more details
In computing , hardware overlay , a type of video overlay , provides a method of rendering an image to a display ... player media player s support hardware overlay. The overlay is a dedicated buffer into which one ... and rendering the buffer contents without going through the GPU. Overview The use of a hardware overlay .... consider how a display works without a hardware overlay. When each application draws to the screen ... overlay was invented By whom date March 2009 . In addition, the graphics processing unit ... such as MPEG 2 s YCbCr into RGB . An application using a hardware overlay gets a completely separate ... color as a mask for that overlay, which the graphics card understands to mean that it is to draw from the separate overlay buffer onto the screen. This technique has become known as chroma key ... the overlay to appear. An application that plays a DVD will draw a solid purple rectangle on the shared screen, and then play the DVD into the special region of memory dedicated to the overlay ... of hardware overlay use, a screenshot program for example, the one automatically built into Windows ... in the hardware overlay window. Rather, a blank region containing only the special mask color is captured ... subsystem. Some Digital Rights Management schemes use hardware overlay to display protected content ... overlay using software to fallback to the shared memory, thus enabling screenshot capture. Secondary ... for their Embedded Graphics Drivers that the overlay can be attached to either one of the displays but not to both note the Intel 945, G33 Q965 chipsets as of 2009 alt now have dual hardware overlay ... , and some newer Matrox graphics card support overlay on both displays for example, the Parhelia ... overlay on the second display while their drivers may not yet support it note as of 2008 alt recent ... redirect hardware overlay to the TV screen. In this case, starting a DVD player on the main screen with overlay enabled would result in video being displayed on the attached TV screen. Implementations ... more details
wikify date November 2009 Also known as End System or Peer to Peer Multicast . High bandwidth multi source multicast among widely distributed nodes is a critical capability for a wide range of important applications including audio and video conferencing, multi party games and content distribution. Throughout the last decade, a number of research projects have explored the use of multicast as an efficient and scalable mechanism to support such group communication applications. Multicast decouples the size of the receiver set from the amount of state kept at any single node and potentially avoids redundant communication in the network. The limited deployment of IP Multicast, a best effort network layer multicast protocol, has led to considerable interest in alternate approaches that are implemented at the application layer, using only End System end systems . In an overlay or end system multicast approach participating peers organize themselves into an overlay topology for data delivery. Each edge in this topology corresponds to a unicast path between two end systems or peers in the underlying Internet . All multicast related functionality is implemented at the peers instead of at routers, and the goal of the multicast protocol is to construct and maintain an efficient overlay for data transmission. End System Multicast Streaming for the Masses End System Multicast ESM is a revolutionary peer to peer media streaming technology that lets you view and broadcast live streaming media. Disadvantages Slow in spreading the data. Long latency. Duplicate packets at certain points. See also Peercasting External links RFC 3170 http www.tldp.org HOWTO Multicast HOWTO.html Multicast over TCP IP HOWTO http www.aqualab.cs.northwestern.edu projects.html Nemo Resilient Overlay Multicast http www.aqualab.cs.northwestern.edu projects.html FatNemo Emulating FatTrees for Overlay Multisource Multicast http esm.cs.cmu.edu End System Multicast http www.samrg.org bib Bibliography on overlay ... more details
Currency overlay is a financial trading strategy or method conducted by specialist firms who manage the currency exposures of large clients, typically institutions such as pension funds, endowments and corporate entities. Typically the institution will have a pre existing exposure to foreign currencies, and will be seeking to limit the risk from adverse movements in exchange rates, i.e. Hedge finance hedge and attempt to profit from tactical foreign exchange views, i.e. speculate . The currency overlay manager will conduct foreign exchange Hedge finance hedging on their behalf, selectively placing and removing hedges to achieve the objectives of the client. Many types of currency overlay accounts are more focused on the speculative aspect, i.e. profiting from currency movements. These so called ... futures contracts, or currency options. Passive currency overlay Currency hedging can be done passively or actively. The stream of returns from passive currency overlay is negatively correlated with international equities, has an expected return of zero, and does not employ any capital. The overlay ... against exchange rate fluctuations. A decision list for a passive overlay manager would include ref ..., The hedged portfolio The benchmark The investor s cash flow preferences Active currency overlay Active currency overlay requires management style decisions on the part of the manager, based on the types ... currency overlay are as follows ref name Record Record, Neil 2003 . Currency Overlay ref Fundamental ... rate bias. ref name Record References Harris, Louise 2006 . Currency Overlay An Introduction Record, Neil 2003 . http www.amazon.com Currency Overlay Wiley Finance Record dp 0470850272 ref sr 1 1?s books&ie UTF8&qid 1322221326&sr 1 1 Currency Overlay The Wiley Finance Series Smith, Ralph 2003 . Currency Hedging for European investors Xin, Dr Hai 2003 . http www.amazon.com Currency Overlay Practical Hai Xin dp 1904339174 Currency Overlay A Practical Guide Book UBS . Second edition to be released ... more details
Orphan date October 2008 An overlay is a poker term generally used to describe the gap between a poker tournament poker tournament s guaranteed prize pool and the actual prize pool generated by entrants. For example, if a tournament has a guaranteed prize pool of 10,000, a buy in of 100 and 90 players enter, the players will contribute only 9,000 to the prizepool. The rest of the prizepool in this example 1,000 &mdash made up by the tournament host&mdash would be the overlay for the tournament. Overlays are far more common in online poker than in live poker simply due to the volume of tournaments online and the fierce competition for players online. Category Poker gameplay and terminology poker stub ... more details
refimprove date April 2011 In telephony , especially in NANP North America , an overlay plan is the practice of introducing a new area code by applying it onto a geography geographic area that is already ... area. Methodology Prior to the introduction of overlay plans, the method of introducing new area codes ... became known as a split plan . In a number of cases, overlay plans were implemented on a special ... making the 202 area code an overlay over the entire region. This meant a number in Virginia, actually ... of area code 202 as an overlay was discontinued, and callers in the area dialing an out of area code ..., in 1992 the telecommunication industry began to introduce overlay plans as a means to introduce ... assigned numbers in the overlay plan areas would have the new area code. As a result, two telephones .... Compromise However, overlay plans introduced a new inconvenience mandatory 10 digit dialing i.e. ... of remembering all the area codes in a geographic area made overlay plans only marginally less unpopular ... areacode.html archivedate May 11, 2009 ref Popularity Overlay plans have been used much more widely ... by two large overlay complexes, as is northern List of Georgia area codes Georgia . List of Connecticut ... recognizes different forms of overlays Distributed overlay or all services overlay an entire ... concentrated overlay only the high growth portion of an existing area gains a second area code. Multiple concentrated overlay the entire existing area gains multiple additional area codes, each of which ... in the NANPA. Multiple area distributed overlay two or more area codes gain a single new area ... 780 780 . Boundary extension overlay a neighboring area code either an overlay code or single primary ... specific overlay the first overlay area code in the NANPA, Area code 917 917 , is the only example ... by split or overlay plans, led to a change in the rules of number block allocation, in order to conserve ... an overlay in 2001. Area code 564 , originally planned for introduction in October 2001, was canceled ... more details
Orphan date February 2009 BATON , BAlanced Tree Over lay Network, is a distributed tree structure for Peer to Peer P2P systems. Different from other overlays that use a distributed hash table DHT , such as in the Chord peer to peer Chord system, BATON organizes peers in a distributed tree to support range search. In addition, BATON tries to keep the tree in a balanced manner as the Avl tree AVL tree . And hence, the search cost is bounded by O logN . Architecture Image Baton.JPG right 500px BATON Overlay BATON is a binary tree. Each node in BATON keeps four kinds of links link to its parent node links to its child nodes links to its adjacent nodes in in order links to the routing nodes in the same level In each tree level, the node is named by its position in the tree. For example, node h is named 3 0, node i is named 3 1 and node p is named 4 6. For a node at position p, it will fill its left routing table by nodes at position p 2 sup x sup for any valid math x geq 0 math and fill its right routing table by nodes at position p 2 sup y sup for any valid math y geq 0 math . Node Joining and Leaving The new node s joining request will always be forwarded to the leaf node. The leaf node will check to see whether it routing table is full. If the routing table is full, this level is full of nodes and the leaf node can accept the new node as its child to create a new level node. Otherwise, it must forward the new node to take over one of the empty positions. When a node wants to leave the network, it must update the routing tables of its parent node, child nodes, adjacent nodes and routing nodes. If this node is a leaf node, it can leave the network safely. Otherwise, it must find a leaf node to replace its position. Routing In BATON, each node maintains a continuous key space. Once a new node joins as its child, it splits its space and assigns half of it to the child. In this partition way, if we travel the tree in in order, we can search the whole space in ascendant ord ... more details
Assay may refer to Assay , a procedure by which the properties of a substance are measured Assay, Indre et Loire , a commune in France disambig eo Provo ... more details
Assay offices are institution s set up to assay test the purity of precious metals, in order to protect consumer consumers . Upon successful completion of an assay, i.e. if the metallurgical content is found ... law the assay offices typically stamp a hallmark , punze , or poin on on the item to certify its ... under Etienne Boileau , Provost of Paris , for Louis IX of France King Louis IX . US assay ... in the United States with United States assay or any similar stamp which gives the impression that the item ... of U.S. assay offices There is no hallmarking scheme in the U.S. yet assay offices did do exist in the U.S. ... assay offices that still operate function solely within national coining system including bullion coinage for sales to investors but are not involved in hallmarking, the end product of the assay which is the subject of this article. There is no hallmarking scheme in the U.S. However, the U.S. assay facilities include ref name treas.gov US assay offices, current The http www.usmint.gov about the mint .... It served as an Assay Office until 1906, when coinage operations began. The http www.usmint.gov ... operations were suspended in March 1955, but the plant continued to operate as an Assay Office. In 1962, its official designation was changed from Mint to Assay Office. Coinage operations were again ... York Assay Office. The Assay Office in Ozark, Arkansas was established in 1835. It has operated as a private club and music venue since the mid 1960s. http www.myspace.com the assay office Jacobs Assay ... establishment in March 1880 in Tucson Arizona Washington Michael Jacobs US assay offices, historical ... as an Assay Office until 1913, when the plant was closed. The New Orleans, Louisiana Mint 1835 to 1942. Coinage operations were conducted here from 1838, but were suspended from 1861 until 1879 assay ... operated as an Assay Office from 1909 until 1942, when it was closed. The U.S. Assay Office, St. Louis, Missouri 1881 to 1911. The U.S. Assay Office, Helena, Montana 1874 to 1933. The U.S. Assay Office ... more details
cgi content full 276 14 10577 ref List of enzyme assays MTT assayOverlayassay Fluorescein diacetate hydrolysis See also Restriction enzyme DNase footprinting assay Enzyme kinetics References references ...Image DU640 spectrophotometer.jpg thumb right 250px Beckman DU640 UV Vis spectrophotometer Enzyme assay ... of assay All enzyme assays measure either the consumption of substrate or production of product over ... method continuous assays , where the assay gives a continuous reading of activity, and discontinuous .... Continuous assays Continuous assays are most convenient, with one assay giving the rate ... of the reaction by measuring a change in how much light the assay solution absorbs. If this light is in the visible region you can actually see a change in the color of the assay, these are called colorimetric assays . The MTT assay , a redox assay using a tetrazolium dye as substrate is an example of a colorimetric assay. UV light is often used, since the common coenzymes Nicotinamide adenine ... versus coupled assays Image Coupled assay.svg thumb 350px right Coupled assay for hexokinase using ... of light, it can still be possible to use a spectrophotometric assay for the enzyme by using a coupled assay . Here, the product of one reaction is used as the substrate of another, easily detectable reaction. For example, figure 1 shows the coupled assay for the enzyme hexokinase , which ... is required. These assays can be used to measure reactions that are impossible to assay in any ... a general assay for enzyme activity? journal Anal. Biochem. volume 296 issue 2 pages 179 87 year ... formation. These types of assay can be extremely sensitive, since the light produced can be captured ... or fluorescent tag. Assay sensitivity has also been increased by switching protocols to improved ... rate and the denaturation rate. If you were to use an assay measuring activity for one second, it would give high activity at high temperatures, however if you were to use an assay measuring product ... more details
A chemosensitivity assay is a laboratory test that measures the number of tumor cells that are killed by chemotherapy . The test is done after the tumor cells are removed from the body. A chemosensitivity assay may help in choosing the best drug or drugs for the cancer being treated. With dozens of chemotherapy agents and hundreds of combinations available for treatment, oncologists often select a regimen from standard protocols developed in clinical trials. References reflist External links http www.cancer.gov Templates db alpha.aspx?CdrID 45990 Chemosensitivity assay entry in the public domain NCI Dictionary of Cancer Terms NCI cancer dict DEFAULTSORT Chemosensitivity Assay Category Medical tests Category Cancer treatments oncology stub ... more details
Multiple issues orphan April 2012 expert February 2012 unreferenced February 2012 The toeprinting assay is an assay to look at the interaction of messenger RNA with ribosomes or other RNA binding protein s. It is different from standard DNA footprinting assay. The toeprinting assay identifies only one edge of the complex on the RNA, whereas DNA footprinting identified both edges of the complex on the DNA. The toeprinting assay has been utilized to examine the formation of the translation initiation complex. The general idea is that you take an RNA of interest and mix it with the 30s subunit of the ribosome, a synthetic DNA primer molecular biology primer that hybridizes downstream of the binding site, the four deoxynucleotide triphosphates, and reverse transcriptase RT . RT will normally synthesize complementary DNA cDNA by extending the primer to the 5 end of the RNA. However, a bound ribosome will block RT from continuing, resulting in a shortened cDNA that is called a toeprint when observed on a sequencing gel. The precise nucleotide position of the toeprint on the RNA can be determined by running a DNA sequencing reaction generated with the same primer in adjacent lanes. Category Molecular biology Category Laboratory techniques Category Molecular biology techniques ... more details
The Trofile TM assay is a blood test that identifies the HIV tropism tropism of a patient s HIV . A molecular assay , Trofile was developed by Monogram Biosciences for use in HIV treatment. The assay s purpose is to identify the HIV tropism tropism of an individual patient s HIV strain R5, X4, or a combination of these known as dual mixed D M . The results show whether the patient is infected with virus that enters cells using the CCR5 R5 co receptor, the CXCR4 X4 co receptor, or both dual mixed . Patients with strains of HIV that prefer the R5 receptor tend to remain healthy longer than those with the strains that prefer X4. However, over the course of the disease, a patient s viral population may undergo a tropism switch from R5 to X4 Fact date June 2009 . References Development and characterization of a novel single cycle recombinant virus assay to determine human immunodeficiency virus type 1 coreceptor tropism. Antimicrob Agents Chemother. 2007 51 2 566 575. Whitcomb JM, Huang W, Fransen S, et al. External links http www.trofileassay.com TrofileAssay.com Monogram Biosciences Trofile assay website http www.medicalnewstoday.com articles 49493.php Four Studies Affirm Significance Of Monogram s Trofile TM HIV Co Receptor Tropism Assay from Medical News Today, August 14, 2006 http www.medicalnewstoday.com articles 64284.php Monogram Provides Update On Trofile TM Assay from Medical News Today, March 2, 2007 http www.medicalnewstoday.com articles 64527.php Scientific Data Highlights Pivotal Role Of Monogram s Molecular Diagnostics In Development And Use Of New HIV Treatments from Medical News Today, March 7, 2007 Category HIV AIDS Category Virology Category Microbiology molecular cell biology stub ... more details
Refimprove date May 2009 Image Tombstone courthouse assay lab.jpg thumb 200px A 19th century assay laboratory ... gold . A metallurgical assay is a compositional analysis of an ore , metal , or alloy . Some assay methods are suitable for raw materials others are more appropriate for finished goods. Raw precious metal s Precious metal Bullion bullion are assayed by an assay office . Silver is assayed by titration ..., Europe s No. 1 Assay Office nl icon Bot generated title ref Precious metal items of art or jewelry ... for 18k gold on the item. In the past the assay was conducted by using the touchstone method but currently ... exacting than the touchstone test. The most exact method of assay is known as fire assay or cupellation. This method is better suited for the assay of bullion and gold stocks rather than works or art ... assay cupellation The most elaborately accurate, but totally destructive, precious metal assay is fire assay. It may also be called by the critical cupellation step that separates precious metal ... an electrolysis test on a gold sample at the Assay office US assay offices United States Assay Office in New York . In the bullion fire assay process, a sample from the article is wrapped in a lead .... Fire assay, as applied to ores, concentrates or less pure metals, adds a fusion or scorification ... to directly analyze precious metals within the lead button. Method details for various fire assay ... of fire assay methodology should be viewed with caution. The standard traditions have a long history of reliability special new methods frequently associate with reduced assay accuracy. Coins A coin assayer is often assigned to each mint coin mint or assay office to determine and assure that all ... and therefore the assay of the raw materials and finished coins is an important quality control ... to required standards. Image Goldas 50g silver bullion in assay card.jpg thumb Golda 50g silver bullion in assay card. Notes reflist Further reading Fire assays Bugby, Edward E. A Textbook of Fire ... more details
A methylene blue active substances assay , or MBAS assay , is a colorimetric analysis test method that uses methylene blue to detect the presence of anionic surfactant s such as a detergent or foaming agent in a sample of water . An anionic surfactant detected by the color reaction is called a methylene blue active substance MBAS . ref Alison L. George, Graham F. White Optimization of the methylene blue assay for anionic surfactants added to estuarine and marine water Environmental Toxicology and Chemistry 1999, Volume 18, pages 2232 2236. DOI 10.1002 etc.5620181016 ref After first acidifying a water sample with boric acid , for example , one adds to it chloroform and a solution of methylene blue et al. ref name EUR Lex http eur lex.europa.eu LexUriServ LexUriServ.do?uri CELEX 32004R0648 EN NOT Regulation EC No 648 2004 of the European Parliament and of the Council of 31 March 2004 on detergents ref Methylene blue is a cationic dye . The biphasic solution is then Agitator device agitated to distribute these reagent s throughout the aqueous and organic phases. ref name EUR Lex If an anionic surfactant is present, then the cationic methylene blue and the anionic surfactant forms an ion pair, which is extracted into the organic phase. The color of the chloroform increases with increasing concentration of surfactants. MBAS assay is an ASTM International standard technique for detecting anionic surfactants. ref name astm http www.astm.org Standards D2330.htm ASTM D2330 02 Standard Test Method for Methylene Blue Active Substances ref These include carboxylate s, phosphate s, sulfate s, and sulfonate s. An MBAS assay alone does not, however, identify specific surfactants. ASTM withdrew the standard ASTM D2330 02 in 2011 pending a review and update of the method, which was last approved in 2003. ref name astm See also Colorimetry Water chemistry analysis Water testing References .... Refend DEFAULTSORT MBAS assay Category Analytical chemistry Category Anionic surfactants Category ... more details
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