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Topic: Channel types

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Ca2+ Channel Antagonist U-92032 Inhibits Both T-Type Ca2+ Channels and Na+ Channels in Hippocampal CA1 Pyramidal Neurons -- Avery and Johnston 77 (2): 1023 -- Journal of Neurophysiology We determined whether U-92032 was selective for T-type channels over other types of Ca channels in hippocampal neurons. T-type channels over other neuronal Ca channel types is not that impressive. the opening of T-type channels, but other types of channels contribute jn.physiology.org /cgi/content/full/77/2/1023

Ion channels and disease: The body electric It was known that ion channels have sensing mechanisms that pick up triggering cues, a pore through which the ions flow, and a selectivity filter that allows only certain types of ions through, but those structures had never been seen. Channels come in several types, based on the ions that tunnel through them: positively charged sodium, calcium, or potassium ions, or negatively charged chloride ions. These switches, better known as ion channels, are roughly donut-shaped proteins that straddle the membrane of every cell in the body. web1.tch.harvard.edu /dream/summer2003/body.html   (1424 words)

Covert Channel Analysis Covert channel auditing requires that sufficient data be recorded in audit trails to enable the identification of (1) individual covert channel use, or use of certain channel types; and (2) identification of the senders and receivers of individual channels or of channel types (i.e., the identification of the covert channel users). Parallel aggregation of covert channel variables requires, for bandwidth maximization reasons, that the sender and receiver pairs be scheduled on different processors at the same time as a group, as illustrated in Figure 2-8 and in [Gligor86]. In contrast, the covert channels of Examples 3 and 4 are noisy channels because, whenever extraneous processes-not just the sender and receiver-use the shared resource, the bits transmitted by the sender may not be received correctly with probability 1 unless appropriate error-correcting codes are used. www.radium.ncsc.mil /tpep/library/rainbow/NCSC-TG-030.html   (19096 words)

Houze's Cloud Atlas Satellite view (infrared channel) of a frontal cloud system over the North Pacific followed to the west by a comma cloud. Satellite view (visible channel) of frontal cloud systems over the North Pacific and high clouds associated with tropical convection over the equatorial Pacific. Convective clouds (small cumulus, towering cumulus, and the anvil of a cumulonimbus) over the South China Sea (December 1978, photo by R. Houze.) Further examples of cumulus. www.atmos.washington.edu /gcg/Atlas   (675 words)

Generic Channel Data We then use lex and yacc to parse these embedded generic channel data declarations and statements out to regular C, the idea being that except for the details of the channel data math, the algorithms for different image types are very similar. data type, we do have a vector space (channels are components of n-tuples that you can add and multiply by scalars), but we also have clipping and rounding operations due to data type restrictions. It makes sense to think of the channel variables as a sort of vector space (scalar multiplication and addition) with a product defined as well (multiplication). www.gegl.org /genericChannelData.html   (675 words)

Syllabus of course: Coding fo Fading Channel Why coding, types of errors, types of channels, channel capacity, noisy channel coding theorem, hard and soft decision decoding, maximum likelihood decoding, coding gain versus bandwidth, combined modulation and coding. Fading channels, examples of fading channels, difference between gaussian and fading channels, mathemaatical models of fading channels, Rayleigh models, fade rate, channel state information, Rician models, frequency selective channel models, coherence bandwidth, channel models for GSM, DECT, GEO, MEO and LEO satellite mobile systems. Properties of block coded modulation, trellis structure of block codes, trellis structure of cyclic codes, multilevel code construction, component code selection, maximum likelihood decoding, multistage decoding, error performance, block coded modulation for fading channels, code design, error performance. www.ee.oulu.fi /~harza/branca.htm   (675 words)

MEGA-CHANNEL Gas Detector While the IQ1000 is a 1-4 channel instrument that can accommodate several types of sensors, units equipped with the MEGA-Gas sensor offer an exclusive "Gas Search'' feature. While there are hundreds of sensor combinations, keep the following guidelines in mind when customizing your Model IQ1000 detector: Channels 1 and 2 can be equipped with any of the four sensor types listed; Channels 3 and 4 can only be equipped with electrochemical sensors. This innovation enables the IQ1000 to scan the air to quickly determine if any of more than 100 gases or vapors are present. www.megs.ca /gas_detectors/monitors/monitor_IQ1000.htm   (701 words)

Clear Channel Creative Simulator Select from the drop down list one of the Clear Channel panel types. There are several different Clear Channel panel types to choose from within this version. Clear Channel’s Creative Simulator helps you test your new creative idea before you launch your campaign, to get an idea of what it would really look like in situ. international.clearchannel.com /outdoor/simulator/uk   (701 words)

gustafson Some oth- er types are the channel billed toucan, the yellow throated toucan the choco toucan and the red breasted. Some types are keel billed touc- an, toco toucan, and the white throated/ white billed toucan. Toucan beaks are so big that they help recognize each other. www.umwebdesign.com /students/gustafson   (701 words)

Telesis For all such trunk types, both two-bit and single-bit channel-associated signaling types are applicable when the interface is PCM30. The signaling bit is also programmable as any of A,B,C, or D. The transmit and receive gains in any PCM30 voice channel may be increased or decreased by MML commands. If the interface is analog, then analog mapping of the single-bit channel-associated signaling type is applicable. www.telesis.com.tr /telesis.php?ID=01-04   (701 words)

Computer and Embedded Interface Bus List Not all bus types are Individually listed here; Some links including the Automotive buses, Vehicle buses, Avionics buses, Field buses, Mezzanine buses, Switched Fabric, SoC buses, Video buses, and VME add-on buses point to another page and provide a number of different bus types on their pages. The EISA bus (in one mode) used both edges of the clock, with the rising edge used to output address, and the falling edge to place the data on the bus. The buses are listed under their common name; however the bus may be known by another name. www.interfacebus.com /Bus_Design_Top.html   (6813 words)

Channel Types of specialty channels may include: news channels sports ch... Bungo Channel The Bungo Channel (豊後水道 Bungo suidō) is a Hoyo Strait. Channel controller A channel controller is a simple CPU used to handle the task of moving data to and from the memory of... www.brainyencyclopedia.com /topics/channel.html   (1784 words)

Fibre Channel - Wikipedia, the free encyclopedia Fibre Channel was primarily interested in simplifying the connections and increasing the lengths, as opposed to increasing speeds. Fibre Channel started in 1988, with ANSI standard approval in 1994, as a way to simplify the HIPPI system then in use for similar roles. Fibre Channel HBAs are available for all major open systems, computer architectures, and buses, including PCI and SBus (obsolete today). en.wikipedia.org /wiki/Fibre_Channel   (976 words)

Dual channel - Wikipedia, the free encyclopedia Dual Channel-enabled memory controllers utilize two 64-bit data channels, resulting in a total bandwidth of 128 bits, to move data from RAM to the CPU. Under the single channel architecture, any CPU with a bus speed that is greater than the memory speed would be liable to fall prey to this bottleneck effect. Rather than wait for memory technology to improve, dual channel architecture simply takes the existing RAM technology and improves the method in which it is handled. en.wikipedia.org /wiki/Dual-channel   (397 words)

CQC Intro's : Quantum Cryptography Quantum cryptography provides means for two parties to exchange a enciphering key over a private channel with complete security of communication. According to the laws of quantum mechanics, the receiver can distinguish between rectilinear polarisations (0 and 90), or it can quickly be reconfigured to discriminate between diagonal polarisations (45 and 135); it can never, however, distinguish both types. However, the act of detection of one particle of a pair destroys its quantum correlation with the other, and the two parties can easily verify whether this has been done, without revealing the results of their own measurements, by communication over an open channel. www.qubit.org /library/intros/crypt.html   (397 words)

Genome Biology Full text An overview of the potassium channel family Potassium channels, originally identified as the molecular entities mediating flows of potassium ions across nerve membranes in action potential generation, are now known in virtually all types of cells in all organisms, where they are involved in a multitude of physiological functions. channels is a subject of much speculation, but the appearance of this family throughout the biological universe suggests that they are ancient proteins, not the highly specialized neuro-machines that were envisioned when they were originally described [1]. The central event initiating channel opening is an outward movement of the S4 transmembrane segment, as depicted in Figure 3b; since this segment carries numerous positively charged residues, this conformational movement is energetically favored by depolarizing voltage [19,20]. genomebiology.com /2000/1/4/reviews/0004   (2446 words)

British Journal of Pharmacology - Effect of potassium channel modulators in mouse forced swimming test The mouse Kv1.1 is, a Shaker-like potassium channel widely distributed in the central nervous system (Wang et al., 1994) endowed with delayed rectifier properties (Hopkins and Tempel, 1992) and primarily involved in the repolarization of many types of neurones (Wang et al., 1994). Potassium channel modulators appear to be involved in the modulation of depressive states as evidenced by the forced swimming test in mice. It is hypothesized that potassium channel openers induce a depressant effect through an hyperpolarization of neurones whereas potassium channel blockers produce an antidepressant-like effect by inhibiting the hyperpolarization thus leading to an increased excitatory response. www.nature.com /bjp/journal/v126/n7/full/0702467a.html   (4481 words)

Ion Channel Biophysics Unit We are interested in the relationship between specific channel gating properties and nerve cell electrical activity, the distribution of ion channels in various types of nerve cells, and the trafficking of ion channels between the cell bodies, where they are sythesized and various nerve cell processes, axons in particular. This unit is focused on the role of ion channels, K channels in particular, in nerve cell function. A sub-class of these vesicles contain a potassium ion channel which has immunological and electrophysiological properties that are similar to those of the K channel in the axonal membrane. intra.ninds.nih.gov /Lab.asp?Org_ID=48   (460 words)

HHMI News: Cause of Rare Genetic Disorder Points to Faulty Ion Channel Potassium ion channels play a crucial role in generating the electrical activity required by certain types of cells. Ion channels are pore-like proteins that poke through cell membranes and control the flow of potassium, sodium and other ions into and out of cells. The discovery of the origin of the inherited disorder, called Andersen's syndrome, is the first known human ion channel disorder, or channelopathy, that has been linked to muscle abnormalities and developmental defects. www.hhmi.org /news/ptacek3.html   (1073 words)

* B channel - (Computing): Definition ISDN is built on two main types of communications channel s: a B channel, which carries data at a rate of 64 Kbps (kilobits per second), and a D channel, which carries control inform ation at either 16 or 64 Kbps. The B channel s are used for voice or user data, and the D channel is used for control and signalling and/or network ing. The D band is a data -signalling channel operating at 16 kilobits per second. www.en.mimi.hu /computing/b_channel.html   (1073 words)

EMECS 2001 [ 1-218 ] In this channel, two types of intrusion from the south of the channel have a strong effect on the coastal environment mainly around summer. Bungo channel is one of the greatest grounds of fish culture and pearl oyster culture in Japan. The Bungo Channel is a semi-enclosed sea with two boundaries, which connects the Pacific Ocean and the Seto Inland Sea. www.emecs.or.jp /emecs2001/abstracts/page/1/1-218.htm   (449 words)

Channel Capacity This key simplification reduces the system to a linear channel with two types of noise, multiplicative noise, due to the effects of XPM, and additive noise, due to FWM. Starting with a physical model of the information channel, statistical properties of the input-output relation can be obtained, which are used in the determination of the capacity of a WDM system. Exact expressions relating the input and output of the system are sufficiently complex to have hindered a determination of the channel capacity, particularly when one considers multichannel systems consisting of multiple fiber links and arbitrary input bit sequences. www.stanford.edu /~hossein/ee359/node4.html   (477 words)

Channel Tunnel --  Encyclopædia Britannica Information on the types of river channels, sediment movement in streams, and runoff processes in Colorado, America. Queen Victoria welcomed an early proposal for a tunnel under the English Channel "in the name of all the ladies in England." Nearly 140 years later the tunnel is open, and its top selling point is still the gratifying lack of motion in the seabed rocks that envelop it. The Channel Tunnel, 31 miles (50 km) long, consists of three tunnels: two for rail traffic and a central tunnel for services and security. www.britannica.com /eb/article-9033276   (725 words)

Channel Tunnel Plans for a Channel Tunnel were revived in the 1950's, when proposals studied included a road tunnel, a road-rail tunnel, a bridge, and a combination of bridges and tunnel. The tunnel is built for four types of trains: passenger shuttles for cars and buses, freight shuttles for trucks, high-speed inter-city passenger trains, and freight trains. Channel Tunnel trains will travel at reduced speeds on existing tracks until work on the rail link is completed. www.cb.uklinux.net /rail.htm   (589 words)

US Television Channels - Overview The UHF channels are numbered 14 to 83, but some of these channels have been reassigned to other types of non-television communications services. In order to minimize interference between two television stations that could share the same channel number, a 10-kilohertz frequency offset is assigned to television stations that are nearby (200 miles is typical). The frequency shown for each channel is the "center frequency" of the NTSC visual carrier for that channel. www.atxnetworks.com /qrf/ustvchan.htm   (589 words)

Channel surfing: watching little, seeing lots Another way of thinking about the discontinuous images of channel surfing is in relation to cinema's use of montage, which in its classic formulations has two main types. Indeed, some authors (Appignanesi and Garratt, 1995) describe channel surfing as evidence of a somewhat postmodern zero consciousness and relate it to Marshal McLuhan's notion of the disappearance of the past. However, channel surfing does not connect one with the rushing river of the universe. www.icce.rug.nl /~soundscapes/VOLUME07/Channel_surfing.html   (3116 words)

Untitled Document Channel and Network are two basic types of data communication between processors and peripherals. Channels can provide a direct or switched point-to-point connection between the communicating devices, which are typically hardware-intensive and transports data at a high speed with low overhead. Fibre Channel is a data transfer technology for large-scale systems, which are usually scalable from single point-to-point applications to large network applications. pages.cpsc.ucalgary.ca /~tangn/523/Project/fiberchannel.htm   (3116 words)

Hardware is secure (false) Channel Register Grand said that these types of problems exist because many hardware engineers are not familiar with security. Security through obscurity is still widely practiced in hardware design but hiding something does not make the problem go away, Grand said. Hardware devices are far from a panacea for information security problems but users are continuing to place too much faith in marketing claims to the contrary, the Black Hat conference was told this week. go.theregister.com /feed/2005/04/01/hw_not_secure   (612 words)

Untitled Document At the heart of the Slant 6V are two independent, foot-switchable channels: Channel One bridges our shimmering clean tone with gutbucket, overdriven blues, while the dual gain settings on Channel Two offer pure tube crunch, soaring sustain and fluid dynamic response. The Rambler is considered by many to be the quintessential club amp, voiced to meet the needs of virtually any player, and all types of music. · Channel one: classic clean to blues grit with reverb -Channel two: sixties crunch to screaming sustain (two gain settings) www.haarguitars.nl /test/Merken/Carr/Carr.htm   (612 words)

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