Wiktionary Null may refer to In computing Null character , the zero valued ASCII character, also designated by tt NUL tt , often used as a terminator, separator or filler Null device , a special computer file that discards all data written to it Null modem , a specially wired serial communications cable Null Object pattern , a software design pattern using an object with defined neutral behavior Null pointer sometimes written code NULL code , used in computer programming for an uninitialized, undefined, empty, or meaningless value Null SQL , a special marker and keyword in SQL Null string , a character string of length zero In art KK Null , a Japanese musician Null, an identity of the character List of recurring Metal Gear characters Gray Fox Gray Fox in the Metal Gear Solid Portable Ops video game Null, man eating sentients in the Downs Lord Triptich books by John Whitbourn Null, the Living ... program ReBoot In mathematics Null mathematics , a zero value in several branches of mathematics Null set , a set that is negligible in some sense Also an older term for the empty set In science Null allele genetics Null cipher , a ciphertext symbol Null hypothesis , a concept in statistical hypothesis testing Null morpheme , a concept in linguistics Null radio , a concept in electromagnetism Null result , the absence of a hypothesized effect in the outcome of a scientific experiment causal structure Tangent vectors Null vectors or curves in the causal structure of a Lorentzian manifold such as a Minkowski space time People Christopher Null , American film critic Eduard van der N ll , Austrian architect Gary Null , American radio host and author on alternative medicine Keith Null , American football player KK Null , Japanese experimental multi instrumentalist musician Other Null and void , having no legal validity The Null Corporation , the current imprint for Nine Inch Nails Null ... Null ru NULL uk NULL zh NULL fi Tyhj ohjelmointi ... more details
Other uses Null disambiguation In mathematics , the word null from German language German null , which is from Latin nullus , both meaning zero , or none ref name oed cite journal title null journal The Oxford English Dictionary , Draft Revision March 2004 url http dictionary.oed.com year 2004 accessdate 2007 04 05 ref means of or related to having Empty set zero members in a set or a value of zero . Sometimes the symbol is used to distinguish null from 0 . In a norm mathematics normed vector space the null vector vector space null vector is the zero vector in a norm mathematics seminormed vector space such as Minkowski space Causal structure Minkowski space , null vectors are, in general, non zero. In set theory , the empty set null set is the set with zero elements and in measure theory , a null set is a set with zero measure. A function mathematics mathematical mapping is said to be null potent or nilpotent if repeated application can map the whole domain into the null element. A null space of a mapping is the part of the domain that is mapped into the null element of the image the inverse image of the null element . In statistics , a null hypothesis is a proposition presumed true unless statistical evidence indicates otherwise. References references Category Mathematical objects Category Nothing ... more details
Unreferenced date January 2007 In statistical hypothesis testing , the null distribution is the probability distribution of the test statistic when the null hypothesis is true. In an F test , the null distribution is an F distribution . DEFAULTSORT Null Distribution Category Statistical inference Category Probability distributions Category Statistical terminology Statistics stub ko ... more details
In Unix like operating system s, tt dev null tt or the null device is a special file that discards all data written to it but reports that the write operation succeeded and provides no data to any process computing process that reads from it yielding end of file EOF immediately . ref name uxman http www.opengroup.org onlinepubs 000095399 basedefs xbd chap10.html Single Unix Specification Section 10.1 ref In programmer jargon , especially Unix jargon, it may also be called the bit bucket ref http catb.org esr jargon html B bit bucket.html Jargon file entry for bit bucket ref or Black hole networking black hole . Usage The null device is typically used for disposing of unwanted input output output ... input streams. This is usually done by Redirection computing redirection . tt dev null tt is a special ... of CP M , DOS and Microsoft Windows Windows , the tt Device Null tt or tt NUL tt of Windows NT and its ... , the .NET Framework .NET based command line interpreter , the equivalent is null. References ... s by Unix programmers, e.g. please send complaints to tt dev null tt , my mail got archived in tt dev null tt , and redirect to tt dev null tt being jocular ways of saying, respectively don t bother ... to dev null, meaning they do not accept donations. The fictitious person name Dave Null is sometimes similarly used e.g., send complaints to Dave Null . The null device is also a favorite subject of technical jokes, such as warning users that the system s tt dev null tt is already 98 full. The April Fool s , 1995 issue of the Germany German magazine c t reported on an enhanced tt dev null tt integrated ... dev tt Unix philosophy Write Only Memory References Reflist nulls DEFAULTSORT Dev Null Category Unix Category Device file Category Nothing ar dev null ca dev null de dev null es dev null fr dev null it dev null hu dev null nl dev null ja dev null nn dev null pl dev null pt dev null ru dev null simple dev null sk dev null sl dev null fi dev null sv dev null tr dev null zh dev null ... more details
In game theory , a null move is a decision by a player to pass that is, not to make a move when it is their turn to move. Even though null moves are against the rules of many games, they are often useful to consider when analyzing these games. Examples of this include the analysis of zugzwang in chess , and the null move heuristic in game tree analysis. Null moves are also an important element in the construction of combinatorial game theory . math stub Category Combinatorial game theory uk ... more details
Unreferenced stub auto yes date December 2009 Orphan date December 2009 In the theory of relativity , a null surface is a 3 surface whose normal vector is everywhere null zero length with respect to the local Lorentz metric , but the vector is not identically zero. For example, light cone s are null surfaces. References James B. Hartle, Gravity an Introduction To Einstein s General Relativity . DEFAULTSORT Null Surface Category General relativity Relativity stub ... more details
Context date October 2009 In the FrameNet project, Null instantiation is the name of a category used to Annotation Linguistics annotate , or Tag metadata tag , absent semantic constituent s or frame element s Charles J. Fillmore Fillmore et al. 2003, Section 3.4 . The term null refers to the fact that the frame element in question is absent. The logical object of the term instantiation refers to the frame element itself. So, null instantiation is the instantiation of a frame element with a null value. Definite null instantiation Definite null instantiation is the absence of a frame element that is recoverable from the context. It is similar to a Zero anaphor zero anaphor . Indefinite null instantiation Indefinite null instantiation is the absence of the object of a potentially transitive verb such as eat or drink. Constructional null instantiation Constructional null instantiation is the absence of a frame element due to a syntactic construction, e.g. the optional omission of agents in passive sentences. References Charles J. Fillmore Fillmore, Charles J. Christopher R. Johnson and Miriam R.L. Petruck 2003 Background to FrameNet. International Journal of Lexicography 16 3 235 250. Charles J. Fillmore Fillmore, Charles J. 1986 Pragmatically Controlled Zero Anaphora. Proceedings of the Twelfth Annual Meeting of the Berkeley Linguistic Society . See also Frame semantics linguistics Frame semantics Anaphora linguistics Anaphora Ellipsis linguistics Ellipsis Category Semantics ... more details
date December 2008 object to the notion of a null morpheme, arguing that it sets up an unverifiable distinction between a null or zero element, and nothing at all. The null morpheme is represented as either ... linguistics hiatus and co operation. The existence of a null morpheme in a word can also be theorized ... number of English noun s is shown by a null morpheme that contrasts with the plural morpheme ... where a null morpheme indicates plurality in nouns that take on irregular plurals. sheep sheep ROOT sheep SINGULAR sheep sheep ROOT sheep PLURAL Also, a null morpheme marks the present tense ... runs run s ROOT run PRESENT 3rd SINGULAR According to some linguists view, it is also a null morpheme that turns some English adjective s into verbs of the kind of to clean, to slow, to warm . Null ... common to employ null affixation not to mark singular number, present tense and third persons English is unusual in its marking of the third person singular with a non zero morpheme, by contrast with a null morpheme for others . It is also frequent to find null affixation for the least markedness ... as null morphemes. But in some cases Root linguistics roots may also be realized as these. For instance ... radical element plus a null morpheme is not the same as an uninflected word , though usage may make those equal in practice. See also Null allomorph Ellipsis linguistics Lemma linguistics Linguistics Marker linguistics Zero linguistics Covert linguistics References reflist DEFAULTSORT Null Morpheme ... more details
S Raphh race, and as such has an almost unlimited ability to manipulate the forces of magic. Null normally ... and durability. Null has the ability to manipulate the forces of magic for a wide variety of effects ... concussion blasts. Null is vulnerable to the mystic energies controlled by certain beings, such as the Gargoyle ... Null Category Comics characters introduced in 1982 Category Marvel Comics demons Category Marvel Comics ... more details
The null character also null terminator , abbreviated NUL , is a control character with the value zero. ref cite IETF rfc 20 title ASCII format for Network Interchange section 5.2 quote NUL Null The all ... Secretariat ISO TC 97 SC 2 date 1975 12 01 page 4.4 quote Position 0 0, Name Null, Abbreviation ... in nearly all mainstream programming language s. ref A byte with all bits set to 0, called the null ... electromechanical teleprinter s were used as computer output devices, one or more null characters ... with no holes at all, so a new unpunched tape is initially filled with null characters, and often text could be inserted at a reserved space of null characters by punching the new characters ... terminated by and including the first null character ANSI ISO 9899 1990 the ANSI C standard , section 7.1.1 ref often called a null terminated string or ASCIIZ string. ref A null terminated byte ... has the value zero the terminating null character ISO IEC 14882 the ISO C standard , section 17.3.2.1.3.1 ... there are other advantages disadvantages described under null terminated string . Representation The null ... . A null character can be placed in a URL with code 00 code , which in case of unchecked user input creates a vulnerability computing vulnerability known as null byte injection and can lead to security exploits. ref http projects.webappsec.org Null Byte Injection Null Byte Injection WASC Threat Classification Null Byte Attack section. ref In caret notation the null character is code code . On some keyboards, one can enter a null character by holding down keypress Ctrl and pressing keypress which ... P . It is also common to be able to type a null with keypress Ctrl keypress 2 or keypress Ctrl keypress space . Citation needed date March 2011 In documentation the null character is sometimes represented ... with a corresponding glyph for visual representation of the null character, symbol for null , U 2400 unicode not to be confused with the actual null character, U 0000. See also Control characters ... more details
Unreferenced date December 2009 File Sidelobes en.svg thumb Yagi Uda antenna polar pattern showing pattern of alternating lobes and nulls In radio electronics , a null is an area or Vector geometry vector in an antenna radio antenna s radiation pattern where the Signalling telecommunication signal cancels out almost entirely. This can be an advantage, as nulls in the horizontal plane can be used to protect other transmitters from Interference communication interference . If not carefully planned however, nulls can unintentionally prevent reception of a signal. Null fill in the vertical plane is used to prevent this. Also, some directional antenna s have very narrow, sharp nulls. These antennas when used for direction finding are aimed away from the signal of interest until the antenna s null is pointed at the signal, and the signal disappears. See also Minkowski space Causal structure Null vector DEFAULTSORT Null Radio Category Antennas radio ... more details
A null cell is a large granular lymphocyte without surface markers or membrane associated proteins from B lymphocytes or T lymphocytes . Natural killer cell s are usually null cells with surface marker CD 16 which bind to the Fc portion of the IgG, and thereby destroy it. NK cells do immune surveillance, attack pathogens and abnormal cells. members of null cells are NK cells, antigen dependent cytotoxic cells ADCC , and the lymphokine activated killer LAK cells. In 75 of the cases of ALL, the lymphocytes are neither B nor T cells and are called Null cells. External links MeshName Null cells Lymphocytes Category Cell anatomy Category Immunology stubs Category Histology cell biology stub ... more details
Generally, a null result is a result without the expected content that is, the proposed result is absent. ref http prola.aps.org abstract PRD v59 i5 e053001 C. Giunti, et al., New ordering principle for the classical statistical analysis of Poisson processes with background. Phys. Rev. D 59, 053001 1999 . ref In science, it is an experimental outcome which does not show an otherwise expected effect. This does not imply a result of zero or nothing, simply a result that does not support the hypothesis . The term is a translation of the scientific Latin nullus resultarum , Idiomatic translation meaning no consequence . Statistics In statistical hypothesis testing , a null result occurs when an experimental result is not significantly different from what is to be expected under the null hypothesis . While some effect may in fact be observed, its probability under the null hypothesis exceeds the significance level , i.e., the threshold set prior to testing for rejection of the null hypothesis. The significance level varies, but is often set at 0.05 5 . Physics In physics , the results of the Michelson Morley experiment MMX were of this type, as it did not detect the expected velocity relative to the postulated luminiferous aether . This experiment s famous failed detection, commonly referred to as the null result , contributed to the development of Special relativity . Note that the MMX did in fact appear to measure a non zero drift , but the value was far too small to account for the theoretically expected results it is generally thought to be inside the noise level of the experiment. Logic In logic , a null result is an invalid value of a proposition. It is one of the possibilities in a Multi valued logic three valued logic true, false, or null result . Law In law , a null result is something lacking any legal or Contract binding force. See Null and void . References reflist ... PRD v59 i5 e053001 modern example Neutrino oscillation null result Category Design of experiments Category ... more details
infobox Book See Wikipedia WikiProject Novels or Wikipedia WikiProject Books name The Players of Null A title orig translator image image caption author A. E. van Vogt illustrator cover artist country United States language English language English series genre Science fiction novel publisher release date english release date media type pages isbn preceded by The World of Null A followed by Null A Three The Players of Null A , usually written The Players of , is a 1956 in literature 1956 science fiction novel by A. E. van Vogt originally published as a four part serial in Astounding Stories from October 1948 to January 1949 this leads to the mistaken idea that the book was published in 1948 due to the copyright notice . It incorporates concepts from the General semantics of Alfred Korzybski and refers to non Aristotelian logic . It was published in the UK under the name The Pawns of Null A . The novel is a continuation of the story of Gilbert Gosseyn from The World of Null A expanding on the galactic events which drove the interplanetary events of the earlier story. DEFAULTSORT Players of Null A Category 1956 novels Category General semantics Category Novels by A. E. van Vogt Category Sequel novels 1950s sf novel stub fr Les Joueurs du ro Juc torii non A ... more details
Null in database theory . Null is a special marker used in SQL Structured Query Language SQL to indicate ... relational database model, Edgar F. Codd E. F. Codd , SQL Null serves to fulfill the requirement ... Greek omega symbol to represent Null in database theory . code NULL code is also an SQL reserved word reserved keyword used to identify the Null special marker. Null has been the focus of controversy ... into the relational model of databases. History Null was introduced by E. F. Codd as a method ... that all RDBMS support Null to indicate missing data in a two part series published in ComputerWorld ... tied to the concept of Null. The Unknown truth value is generated whenever Null is compared with any data value, or with another Null. Codd indicated in his 1990 book The Relational Model for Database Management, Version 2 that the single Null mandated by the SQL standard was inadequate, and should be replaced by two separate Null type markers to indicate the reason why data is missing. These two Null type markers are commonly referred to as A Values and I Values , representing Missing But Applicable ..., the idea of multiple Null type values has not gained widespread acceptance. Three valued logic 3VL Since Null is not a member of any data domain , it is not considered a value , but rather a marker or placeholder indicating the undefined value absence of value . Because of this, comparisons with Null ... to Null, is Unknown source lang sql SELECT 10 NULL Results in Unknown source However, certain operations on Null can return values if the value of Null is not relevant to the outcome of the operation ... circuited form source lang sql SELECT TRUE OR NULL Results in True source In this case, the fact ... with Null, so the SQL standard provides for two special Null specific comparison predicates. The code IS NULL code and code IS NOT NULL code predicates test whether data is, or is not, Null. ref name ... IEC year 2003 pages Section 8.7 null predicate nopp true ref Data typing Null is untyped in SQL, meaning ... more details
distinguish identity function empty function In computer science , a null function or null operator is subroutine that returns no data values and leaves the program state unchanged. When it is part of the instruction set of a central processing unit processor , it is called a NOP or NOOP No OPeration . Mathematically, a computer function f is null if and only if its execution leaves the program state s unchanged. That is, a null function is an identity function whose domain mathematics domain and codomain are both the state space S of the program, and for which f s s for all elements s in S . Less rigorous definitions may also be encountered. For example, a function may take a single operand, type conversion transform it into a new data type , and return the result. ref Example of a type conversion function labeled as a null function http www.thinkage.ca english gcos expl nsc lib 0nullf.html NULLF null function. ref While such usages bear a strong visual resemblance to identity functions, they create or alter a binary data values and thus change the program state. From a software maintainability perspective it is better to identify such minor alternations of state explicitly, since calling them null functions provides future maintainers of the code with no insights on their actual purposes. Uses Null functions have several uses. During software development , null functions with the same names and type signature s as a planned functions are often used as method stub stub s that is, as non ... prior to completion of all planned features. Null functions, particularly the NOP variety, are also ... period. A third use of null functions is as the definition of a program feature that, if created inadvertently, is almost always deleterious. Unintended null functions can arise during the development ... structures. A null function or method is often used as the default behavior of a revectorable function or overrideable method in an object framework. Notes references nulls DEFAULTSORT Null Function ... more details
For the periodical Null Hypothesis The Journal of Unlikely Science Main Statistical hypothesis testing ... using a test of observed data. The null hypothesis typically corresponds to a general or default position. For example, the null hypothesis might be that there is no relationship between two measured phenomena, ref cite web url http www.businessdictionary.com definition null hypothesis.html title null hypothesis definition publisher Businessdictionary.com date accessdate 2010 07 29 ... proven guilty can be interpreted as saying that his or her innocence is the null hypothesis. Other legal systems may exist in which the null hypothesis is that the defendant is guilty. The term was originally ... statistics.berkeley.edu stark SticiGui Text gloss.htm null hypothesis title Glossary publisher Statistics.berkeley.edu ... negation of the null hypothesis and predicts the results from the experiment if the alternative ... how probability probable the data are, assuming the null hypothesis is true. If the data ... that the null hypothesis is false. If the data do not contradict the null hypothesis, then no conclusion is made. In this case, the null hypothesis could be true or false the data give insufficient ... a heart attack. Possible null hypotheses are this drug does not reduce the chances of having a heart ... . If the data show a statistically significant change in the people receiving the drug, the null hypothesis is rejected. Choice of H sub 0 The choice of null hypothesis H sub 0 and consideration ... i.e. that on average it lands heads up 50 of the time . A potential null hypothesis is this coin ... result of 5 tosses is 5 heads. Under this null hypothesis, the data are considered unlikely with a fair coin, the probability of this is 3 . The data refute the null hypothesis the coin is biased. Alternatively, the null hypothesis, this coin is fair allows runs of tails as well as heads, increasing ..., preserving the null hypothesis. ref The example dataset demonstrates the point, but is actually ... more details
Infobox album See Wikipedia WikiProject Albums Name Null Type EP Artist Foetus band Foetus Cover Foetus Null.jpg Released 1995 Recorded Unique, New York City Genre Industrial music Industrial Length 33 15 Label Big Cat Records Big Cat Producer J. G. Thirlwell Reviews Allmusic 3 5 Allmusic class album id r527696 pure url yes link Last album Gash album Gash br 1995 This album Null br 1995 Next album Verklemmt Be Thankful br 1995 Null is an extended play EP by Foetus band Foetus , released in 1995 by Big Cat Records in the United Kingdom UK . Null acts as a de facto single music single for Verklemmt, released on Gash album Gash . Promotional copies of Null were distributed by Sony Records Sony Columbia Records Columbia in the United States US , but the EP had no official US release. Null was later rereleased as half of the Null Void double CDEP set. Track listing All tracks written by J. G. Thirlwell Verklemmt 4 45 Be Thankful 4 50 Verklemmt Protecto Mix 8 54 Butter 4 05 Into The Light 6 49 Verklemmt Queef Mix 3 52 Personnel and production J. G. Thirlwell Performance, production, compositions, arrangements, art direction Rob Sutton Engineering Howie Weinberg Mastering Brian Freeman Art direction Jean Carbain Graphic artist External links http foetus.org discog null.html Null at foetus.org J.G. Thirlwell DEFAULTSORT Null Ep Category 1995 EPs Category Foetus albums Category Albums produced by J. G. Thirlwell it Null EP ... more details
Other uses Null disambiguation unreferenced date June 2009 In linear algebra , the null vector or zero vector or empty vector is the vector geometric vector 0, 0, , 0 in Euclidean space , all of whose components are zero. It is usually written with an arrow head above or below it math vec 0 math or 0 or simply 0. A zero vector has arbitrary direction, but is orthogonal ie perpendicular, normal to all other vectors with the same number of components. A different kind of vector, also called null vector or zero vector, arises in various generalizations of Euclidean space, as explained below. Since the word Pointer computing The null pointer null has a more general and very different meaning in computer programming, many programmers prefer the term zero vector to avoid confusion. For example, the statement if MyVector Null would intuitively be interpreted as if MyVector is a null pointer by many programmers, as opposed to if MyVector is a null zero vector . Linear algebra For a general vector space , the zero vector or null vector or empty vector is the uniquely determined vector that is the identity element for vector addition . The zero vector is unique if a and b are zero vectors, then a a b b . The zero vector is a special case of the zero tensor . It is the result of scalar multiplication by the scalar 0. The preimage of the zero vector under a linear transformation f is called kernel algebra kernel or null space . A zero space is a linear space whose only element is a zero vector. The zero vector is, by itself, linear independence linearly dependent , and so any set of vectors which includes it is also linearly dependent. In a Norm mathematics normed vector space there is only ... space there might be more than one vector of norm equal to 0. These vectors are often called null vectors ..., the coordinate representation of a null vector in Minkowski space contains non zero values. In the Verma module of a Lie algebra there are null vectors. Category Linear algebra Category Zero Category ... more details
Infobox record label name The Null Corporation image image bg parent founded 2008 founder Trent Reznor status Active genre Alternative music Alternative , ref name muspace cite web url http www.myspace.com nin title MySpace nine inch nails accessdate 2008 10 18 publisher MySpace ref Rock music Rock , ref name muspace Industrial music Industrial ref name muspace country United States of America USA location Los Angeles, California url The Null Corporation is an independent record label , ref name muspace which releases the work of Nine Inch Nails and How to Destroy Angels band How to Destroy Angels . The Nine Inch Nails albums, Ghosts I IV and The Slip album The Slip , have been released in physical formats under the Null Corporation imprint . Also, the name appears in association with Nine Inch Nails Music download digital downloads , their official YouTube channel, ref cite web url http www.youtube.com user ninofficial title YouTube ninofficial s Channel accessdate 2008 05 06 publisher YouTube ref and on their official MySpace and Facebook accounts. ref name muspace ref cite web url http www.facebook.com ninofficial title Facebook ninofficial accessdate 2008 10 18 publisher Facebook ref Releases 2008 Nine Inch Nails &ndash Ghosts I IV ref name rym cite web url http rateyourmusic.com label the null corporation title The Null Corporation accessdate 2008 05 06 publisher Rate Your Music ref ref name MB cite web url http musicbrainz.org label f6f102a5 f7f0 49aa 8470 f71d083e3439.html title The Null Corporation accessdate 2008 05 06 publisher MusicBrainz ref ref name discogs cite web url http www.discogs.com label The Null Corporation title The Null Corporation accessdate 2008 05 06 publisher Discogs ref Nine Inch Nails &ndash Discipline Nine Inch Nails song Discipline single ... Nine Inch Nails es The Null Corporation fr The null corporation gl The Null Corporation lv The Null Corporation pt The Null Corporation ... more details
Infobox Musical artist See Wikipedia WikiProject Musicians Name KK Null Img Kknullnull.jpg Img capt Img size Only for images narrower than 220 pixels Landscape Background solo singer Birth name Kazuyuki Kishino Alias Born Died Origin Tokyo , Japan Instrument Genre Occupation Years active Label Associated acts URL http www.kknull.com Notable instruments KK Null this is how he spells it on his official site with the period only after the second K and all caps born Kazuyuki Kishino in Tokyo is a Japan ese experimental multi instrumentalist. He began as a guitarist , but soon added composer , singer , electronic musician and drummer to his list of talents, and also studied with the Butoh workshop. Null joined the noise music noise progressive rock band Ybo2 in 1984, issuing several album s and Extended play EPs throughout the remainder of the decade. Later he founded more bands, such as Absolute Null Punkt aka ANP and his most well known one, the self described progressive hardcore trio Zeni Geva . From that point he also produced albums for other artists, created his own record label Nux Organization , played live and collaborated on albums with many other musicians, including John Zorn , Yona Kit , Steve Albini , Boredoms , Seiichi Yamamoto , Jim O Rourke musician Jim O Rourke , Merzbow , Fred Frith , James Plotkin , Keiji Haino , Otomo Yoshihide , Jon Rose , Atau Tanaka , Zbigniew ... such artists as Sonic Youth and Mike Patton on tour. Altogether Null has released more than 100 albums ... links http www.kknull.com KK NULL official site http www.soundofjapan.hu nullinterview.html An in depth interview from April, 2006 http www.discogs.com artist K.K. Null KK Null discography at Discogs Persondata Metadata see Wikipedia Persondata . NAME Kk Null ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH 1961 PLACE OF BIRTH DATE OF DEATH PLACE OF DEATH DEFAULTSORT Kk Null Category 1961 births ... Tokyo Category Noise music Japan musician stub fr Kazuyuki K. Null tl KK Null ... more details
Unreferenced date December 2009 A null allele is a mutant allele copy of a gene that completely lacks that gene s normal function. This can be the result of the complete absence of the gene product protein, RNA at the molecular level, or the expression of a non functional gene product. At the phenotype phenotypic level, a null allele is indistinguishable from a deletion of the entire locus genetics locus . A mutant allele that produces no protein is called a protein null shown by Western blot Western analysis , and one that produces no RNA is called an RNA null shown by Northern blot Northern analysis or by DNA sequencing of a deletion allele . A genetic null or Muller s morphs amorph ic allele has the same phenotype when homozygous as when heterozygous with a deficiency that disrupts the locus in question. A genetic null allele can be a protein and RNA null, but can also express normal levels of a gene product that is non functional due to mutation. Another definition of null allele concerning molecular markers, refers to such a marker in the case it can no longer be detected because of a mutation. For example, Microsatellite genetics microsatellite s i.e. a repetitive sequence of DNA, in which the repeat is rather short are used as molecular markers amplifying them through Polymerase chain reaction PCR . To do so, a Primer molecular biology primer or oligonucleotide aligns with either of ends of the locus. If a mutation occurs in the annealing site, then the marker can no longer be used and the allele is turned into a null allele. One example of a null allele is the O blood type allele in the human A, B and O blood types blood type system . The alleles for the A antigen and B antigen are Dominance relationship co dominant , thus they are both phenotype phenotypically expressed ... for the O blood type as a null allele. See also Muller s morphs amorph Genetic deletion RecLOH Unique event polymorphism DEFAULTSORT Null Allele Category Classical genetics de Nullallel es Alelo nulo ... more details
Proposed deletion dated concern Does not meet the general notability guideline. timestamp 20110331211839 notability date February 2011 primarysources date February 2011 Infobox software name Null httpd title Null httpd logo File screenshot File caption collapsible author developer released Start date YYYY MM DD discontinued latest release version 0.5.1 latest release date Start date and age YYYY MM DD latest preview version latest preview date Start date and age YYYY MM DD frequently updated DO NOT include this parameter unless you know what it does programming language operating system Linux and Microsoft Windows Windows platform size 26K language status genre Tiny web servers Tiny web server license GNU General Public License website http nullhttpd.sourceforge.net httpd nullhttpd.sourceforge.net httpd Null httpd is a tiny web servers tiny web server which is designed to be very small, simple, multithreaded, and available for Linux and Microsoft Windows Windows . Null httpd is free software open source software open source , and is distributed under the GNU General Public License GPL . Null httpd is now part of the Puppy Linux Main Release Linux distribution distribution . See also Portal Free software Comparison of lightweight web servers Comparison of web servers External links http nullhttpd.sourceforge.net httpd Null httpd web site Freshmeat nullhttpd Null httpd SourceForge nullhttpd Null httpd DEFAULTSORT Null Httpd Category Free web server software network software stub ... more details
infobox Book See Wikipedia WikiProject Novels or Wikipedia WikiProject Books name Null A Three title orig translator image image caption author A. E. van Vogt illustrator cover artist country United States language English language English series genre Science fiction novel publisher release date english release date media type pages isbn preceded by The Players of Null A followed by Null A Three , usually written Three , is a 1985 science fiction novel by A. E. van Vogt . It incorporates concepts from the General semantics of Alfred Korzybski and refers to non Aristotelian logic . The novel is a continuation of the adventures of Gilbert Gosseyn from the The World of Null A 1945 and The Players of Null A 1948 . Gilbert Gosseyn wakes to find he is Gosseyn Three, in telepathic contract with Gosseyn Two. One of the spare bodies used in his reincarnation machinery was found and forced to life by the approach of an immense space fleet from another galaxy, manned by the primordial ancestors of man, gripped in an eon long war with mutants equally as old. The space fleet is ruled by an unstable youngster who seems to possess many of the same powers, including a double brain, as Gosseyn. Gosseyn must school the youth in Null A sanity, save the Earth from a cabal of gangsters and businessmen who oppose the return of the Games Machine, discover the secret reasons behind the endless horrifying war, and stop the intrigues of Enro the Red to return to power. Many critics regard this as the weakest of the Null A books, and the estate authorized Null A sequel Null A Continuum ignores its events. External links isfdb title id 797 1980s sf novel stub Category 1985 novels Category General semantics Category Novels by A. E. van Vogt fr La Fin du ro Sf r itul non A ... more details
In mathematics, the null sign , math varnothing math , denotes the empty set . It is derived from the Danish language Danish and Norwegian language Norwegian letter . Category Mathematical symbols ... more details
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