Placodiscus caudatus

Placodiscus opacus is a species of plant in the family Sapindaceae. It is found in Cameroon, Central African Republic, Equatorial Guinea, and Gabon. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.

Plactic algebra

Placodiscus opacus

A placket (also spelled placquet) is an opening in the upper part of trousers or skirts, or at the neck or sleeve of a garment. Plackets are almost always used to allow clothing to be put on or removed easily, but are sometimes used purely as a design element. Modern plackets often contain fabric facings or attached bands to surround and reinforce fasteners such as buttons, snaps, or zippers.

Placosaris bornealis is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found on Borneo.

Plackemeier

Placocosma resumptella is a moth of the Oecophoridae family. It is found in Australia.

Placobdella parasitica is a species of leech. Leeches are habitual ectoparasites of vertebrates in aquatic environments. Placobdella parasitica is differentiated from other members of the genus by its smooth dorsal surface, simple to complicated pigmentation, and abdomen with 8 to 12 stripes.

Placopsis (bullseye lichen) is a genus of lichenized fungi in the family Agyriaceae.

Placoschema dimorpha is a species of beetle in the family Cerambycidae, the only species in the genus Placoschema.

Placostylus ambagiosus worthyi

Placodontia ("Tablet teeth") is an extinct order of marine reptiles that lived during the Triassic period, becoming extinct at the end of the period. It is believed that they were part of Sauropterygia, the group that includes plesiosaurs. Placodonts were generally between 1 to 2 m (3 ft 3 in to 6 ft 7 in) in length, with some of the largest measuring 3 m (9.8 ft) long. The first specimen was discovered in 1830. They have been found throughout central Europe, North Africa, the Middle East and China.

Placolobium gracile

Placostylus cuniculinsulae

Placoptila resoluta is a moth in the family Cosmopterigidae. It is found on Buru.

Placodiscus boya

Placodiscus pseudostipularis is a species of plant in the family Sapindaceae. It is found in Ivory Coast, Ghana, Liberia, and Sierra Leone. It is threatened by habitat loss.

Placosaris udealis

Placosaris ingestalis is a moth in the family Crambidae. It was described by Snellen in 1899. It is found on Java.

Placoclytus virgulatus

Placopyrenium is a genus of fungi in the family Verrucariaceae.

Placochelys ('flat-plate turtle") is an extinct genus of placodont reptiles erected by Otto Jaekel in 1902.

Placzewo, Starogard County

Placosaris dohertyi

Placospongia is a genus of sea sponge belonging to the family . This genus is characterized by a high density of siliceous spicules. Members of this genus are known to be eaten by hawksbill turtles.

Placoclytus championi is a species of beetle in the family Cerambycidae. It was described by Bates in 1885.

Placochilus is a genus of insects in the family Miridae, the plant bugs.

Placque (disambiguation)

Placolabis

Placówka (film) is a Polish historical film. It was released in 1979.

Placospermum is a genus of a single species of large trees, constituting part of the plant family Proteaceae. The species Placospermum coriaceum grows only (endemic) in the rainforests of the wet tropics region of north eastern Queensland, Australia. Common names include rose silky oak and plate-seeded oak.

Placoclytus virgulatus is a species of beetle in the family Cerambycidae. It was described by Chemsak and Linsley in 1974.

Placostylus ambagiosus spiritus

Placosternus

Placoasterina antioquensis

Placosaris labordalis

Placula

Placostylus fibratus is a species of large air-breathing land snail, a pulmonate gastropod mollusk in the family Bothriembryontidae. This species is endemic to New Caledonia. Known locally as bulime, the snails are considered a highly prized delicacy on Ile des Pins and are locally farmed to ensure supply.

Placita generalia

In mathematics, the plactic monoid is the monoid of all words in the alphabet of positive integers modulo Knuth equivalence. Its elements can be identified with semistandard Young tableaux. It was discovered by Donald Knuth () (who called it the tableau algebra), using an operation given by Craige Schensted () in his study of the longest increasing subsequence of a permutation.
In mathematics, the plactic monoid is the monoid of all words in the alphabet of positive integers modulo Knuth equivalence. Its elements can be identified with semistandard Young tableaux. It was discovered by Donald Knuth () (who called it the tableau algebra), using an operation given by Craige Schensted () in his study of the longest increasing subsequence of a permutation. It was named the "monoïde plaxique" by , who allowed any totally ordered alphabet in the definition. The etymology of the word "plaxique" is unclear; it may refer to plate tectonics ("tectonique des plaques" in French), as elementary relations that generate the equivalence allow conditional commutation of generator symbols: they can sometimes slide across each other (in apparent analogy to tectonic plates), but not freely.

Placoparmelia patagonica

Placodontiformes

Placosoma is a lizard genus in the family Gymnophthalmidae. They are endemic to southern Brazil.

Placosternus difficilis, commonly known as the Mesquite Borer, is a wood boring longhorn beetle which resembles a black and yellow wasp. Larvae of mesquite borers are deposited in mesquite trees. It has been seen to be attracted to mesquite trees when there is freshly cut or broken limbs and logs. Adults use nectar and pollen as a food source. It is typically found in Mexico and the Southern United States.

(main summit)

Placostylus ambagiosus

Placoda pili

Placzkowo, Rawicz County

Placolabis is a genus of earwigs in the subfamily Anisolabidinae. It was cited by Srivastava in Part 2 of Fauna of India.

Placilla (disambiguation)

Placodontiform

Placopoda virgata is a species of plant in the family Rubiaceae. It is endemic to Yemen. Its natural habitats are subtropical or tropical dry forests and subtropical or tropical dry shrubland.

Placosaris beatrix

Plackweghohe

Placydów [plaˈt͡sɨduf] is a village in the administrative district of Gmina Aleksandrów Łódzki, within Zgierz County, Łódź Voivodeship, in central Poland. It lies approximately 3 kilometres (2 mi) west of Aleksandrów Łódzki, 12 km (7 mi) south-west of Zgierz, and 15 km (9 mi) west of the regional capital Łódź. The village has a population of 50.

Placostylus porphyrostomus is a species of large air-breathing land snail, a pulmonate gastropod mollusk in the family Bothriembryontidae. This species is endemic to New Caledonia.

Placoda lentis

Placodiscus attenuatus is a species of plant in the family Sapindaceae. It is found in Ivory Coast and Ghana. It is threatened by habitat loss.

Placoptila artionoma

Placoid scales

Placopleurus is an extinct genus of prehistoric bony fish.

Placodiscus oblongifolius

Placocosma resumptella

Placosaris triticalis is a species of moth of the family Crambidae described by George Hamilton Kenrick in 1907. It is found in Papua New Guinea. This species has a wingspan of 26 mm.

Placopsis imshaugii

Placoptila electrica is a moth in the family Cosmopterigidae. It is found in India.

Placosphaeria trifolii

Placoclytus is a genus of beetles in the family Cerambycidae, containing the following species:
* Placoclytus championi (Bates, 1885)
* Placoclytus distortus (Chevrolat, 1860)
* Placoclytus virgulatus Chemsak & Linsley, 1974

Placolepis is an extinct genus of phyllolepid placoderm first discovered in New South Wales. Placolepis was the most widespread phyllolepid genus, with fossils found in Australia, Turkey, Venezuela and Antarctica.

Placoeme vitticollis

Placostylus bivaricosus

Placostylus ambagiosus is a species of flax snail (Māori: pupuharakeke), a large air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Bothriembryontidae.

Placoasterina is a genus of fungi in the Asterinaceae family. The relationship of this taxon to other taxa within the class is unknown (incertae sedis), and it has not yet been placed with certainty into any order. This is a monotypic genus, containing the single species Placoasterina antioquensis.

Placolepis

Placydów

Placosaris triticalis

Placosternus erythropus is a species of beetle in the family Cerambycidae. It was described by Chevrolat in 1835.

Placoptila electrica

Placzkowo

Placosaris swanni is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in Burma.

Placiphorella, the veiled chiton, is a genus of polyplacophoran molluscs with precephalic tentacles, which are used in feeding.

Plaek Pibul Songgram

Placodes cinereola

Placoparia is a genus of trilobites of average size (up to 6 cm) that lived during the late Lower to the early Upper Ordovician on the paleocontinents Gondwana, Avalonia and Laurentia, now the Czech Republic, France, Germany, Morocco, Portugal, Spain and Wales. Its headshield (or cephalon) is semi-circular to rectangular with rounded frontal corners. It lacks eyes, but eye ridges are present. The fact that the facial sutures are opisthoparian (with sutures in Pliomera gonatoparian) is an exception in the otherwise proparian Cheirurina. The thorax has 11 or 12 segments, with the axis slightly wider than the ribs (or pleurae) to its sides. The tips of the pleurae are free, which resembles an old-fashion central heating radiator. The axis in the small tailshield (or pygidium) consists of four rings and a minute endpiece. The four pleurae end in spatulate spines that fit to corresponding indentations in the cephalon.

Plaerrer (Nuremberg U-Bahn)

Placitas is a census-designated place in Doña Ana County, New Mexico, United States. Its population was 576 as of the 2010 census. The community is along the western border of Hatch, New Mexico.

Placoptila artionoma is a moth in the family Cosmopterigidae. It is found in New Guinea.

Placochelyidae is an extinct family of placodonts belonging to the superfamily Cyamodontoidea.

Placobranchoidea

The Placiti Cassinesi are four official juridical documents written between 960 and 963 in southern Italy, regarding a dispute on several lands among three Benedictine monasteries and a local landowner. They are considered the first extant documents written in a vernacular of Italy, along with the Veronese Riddle.

Placinteni

Placolith

Placyzoan

Placosoma may refer to:
* Placosoma (lizard), a genus of lizards in the family Gymnophthalmidae
* Placosoma (fungus), a genus of fungi in the family Asterinaceae
* (Placosoma Ijima, 1903), a genus of sponge in the family Euplectellidae accepted as Ijima, 1904

Placunanomia zelandica

Placosaris dohertyi is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in India (Assam).

Placodiscus caudatus is a species of plant in the family Sapindaceae. It is found in Cameroon, Central African Republic, and Gabon. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.

Placosaris lindgreni

Plack (1921 – 1940) was a British Thoroughbred racehorse and broodmare. As a juvenile in 1923 when she won three races and finished second to Diophon in the Middle Park Stakes. In the following year she recorded her biggest victory when taking a very strong renewal of the 1000 Guineas and then finished second in the Epsom Oaks. Later that year she added wins in the Newmarket Oaks and the Jockey Club Cup. She failed to win in 1925 but was placed in the Coronation Cup, Hardwicke Stakes, Doncaster Cup and Jockey Club Cup. Despite producing few foals she had some influence as a broodmare.

Placing of Seamen Convention, 1920 is an International Labour Organization Convention. It was established in 1920: Having decided upon the adoption of certain proposals with regard to the "supervision of articles of agreement; provision of facilities for finding employment for seamen; application to seamen of the Convention and Recommendations adopted at Washington in November last in regard to unemployment and unemployment insurance", ...

Placosternus crinicornis is a species of beetle in the family Cerambycidae. It was described by Chevrolat in 1860.

Placoptila lucicincta is a moth in the family Cosmopterigidae. It is found on Java.

*Squamarina subgen. Placopsis (Nyl. (1861)

Placocrea

The Plackwald is a ridge of hills, up to 581.5 m above sea level (NHN), and part of the Rhenish Massif in the counties of Soest and Hochsauerlandkreis, North Rhine-Westphalia, Germany. Within the North Sauerland Highlands (Unit number 334) it forms the natural region sub-unit of Plackweghöhe (Plackwald) (334.5).

Placzek transient

Placobranchidae

Placosaris galogalis is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in the Philippines (Mindanao).

Placocrea is a genus of fungi in the family Mycosphaerellaceae; according to the 2007 Outline of Ascomycota, the placement in this family is uncertain.

The Plackweghöhe ("Plackweg Heights"), whose main summit has hitherto had no official name, is the highest point in the borough of Warstein, the hill ridge of the Plackwald, the North Sauerland Uplands, and the Arnsberg Forest Nature Park in the German state of North Rhine-Westphalia. It is 581.5 m above sea level (NHN) and lies within the counties of Soest and Hochsauerlandkreis. The observation tower at the top is a popular destination.

Pladaroxylon is a genus of trees in the groundsel tribe within the sunflower family. The only known species is Pladaroxylon leucadendron, native to the island of St. Helena in the South Atlantic. Common name is he cabbage-tree.

Placzkow

Placynthiella is a genus of lichenized fungi in the family Agyriaceae.

Placostylus hongii is a species of very large, air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Bothriembryontidae.

Placitas is a census-designated place (CDP) in Sandoval County, New Mexico, United States. As of the 2010 census, its population was 4,977. It is part of the Albuquerque Metropolitan Statistical Area.

Placoschema dimorpha

Placopecten magellanicus, the Atlantic deep-sea scallop (previously known as Pecten tenuicostatus and as Pecten grandis and once referred to as the "giant scallop") is a commercially important pectinid bivalve mollusk native to the northwest Atlantic Ocean.

Placiphorella

Placosternus crinicornis

Placosternus difficilis

Placoeme vitticollis is a species of beetle in the family Cerambycidae. It was described by Chemsak and Linsley in 1964.

Placoptila resoluta

Placocheilus cryptonemus

Placoid fish

Placoptila choromima is a moth in the family Cosmopterigidae. It is found on Java.

Placynthiopsis is a lichenized genus of fungi within the Placynthiaceae family.

*Aspiciliopsis (Müll.Arg.)M.Choisy(1929)

Placostylus bollonsi caperatus

Plack is a Perl web application programming framework inspired by Rack for Ruby and WSGI for Python, and it is the project behind the PSGI specification used by other frameworks such as Catalyst and Dancer. Plack allows for testing of Perl web applications without a live web server. Plackup is a command line utility to run PSGI applications from the command line.

Placosaris lindgreni is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in India.

Placodontiformes is a clade of sauropterygian marine reptiles that includes placodonts and the non-placodont Palatodonta. It was erected in 2013 with the description of Palatodonta. Placodontiformes is the most basal clade of Sauropterygia and the sister group of Eosauropterygia, which includes all other sauropterygians.

Placoparmelia

Placostylus, or flax snails, are a genus of very large, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Bothriembryontidae. The shells of the snails in this genus can be as large as 4.5 inches (11 cm) in maximum dimension. Many species within this genus are now extinct.

A placodioid lichen is a crustose lichen with a growth form that radiates out from a center, sometimes peeling up at the ends of the radial arms to have a leafy form, but without a cortex on the underside, like a foliose lichen.

Placosaris leucula is a moth in the family Crambidae. It was described by Meyrick in 1897. It is found in Indonesia (Sangihe Islands) and the Philippines (Luzon).

Placoda dermis

Placopecten is a genus of scallops, marine bivalve molluscs in the family Pectinidae, the scallops.

Placodus

Placosaris steelei is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in Burma.

Placosoma

Placzkowice

The Placynthiaceae are a lichenized family of fungi in the order Peltigerales (suborder ). Species of this family are found largely in northern temperate regions.

Placoptila cyclas is a moth in the family Cosmopterigidae. It is found in India.

Placynthiaceae

Placothelium staurothelioides

Placobranchus

Placoid

Placopoda virgata

Placoeme is a genus of beetles in the family Cerambycidae, containing the following species:
* Placoeme vitticollis Chemsak & Linsley, 1964
* Placoeme wappesi Galileo & Martins, 2010

Placopsis imshaugii is a species of lichen in the family Agyriaceae. Known from Chile, it was described as new to science in 2011.

Placodiscus oblongifolius is a forest tree in the family Sapindaceae. It is endemic to lowland rain forests of West Africa, with the best studied populations in Ghana.

Placosaris beatrix is a moth in the family Crambidae. It was described by Meyrick in 1938. It is found on Java.

Placostylus ambagiosus watti

Placostylus ambagiosus lesleyae

Placosoma (fungus)

Placostylus ambagiosus ambagiosus

Placée

Placostylus fibratus

Placotome

Plackett–Burman design

Placé is a commune in the Mayenne department in north-western France.

Placówka (film)

Placobranchus variegatus

Placonia is a genus of moths of the family Noctuidae.

Placitas, Sandoval County, New Mexico

Placostromella is a genus of fungi in the class Dothideomycetes. The relationship of this taxon to other taxa within the class is unknown (incertae sedis).

Placodontoidea

Placunanomia ione

Plackett, Lawrence

Placoid scale

Placosaris leucula

Placodiscus boya is a species of plant in the family Sapindaceae. It is found in Côte d'Ivoire and Ghana. It is threatened by habitat loss.

Placidyl

Placoclytus championi

Placozoans

Placzkowko

Placoderms

Plack (disambiguation)

Placobranchus guttatus

Plackett-Burman design

Placynthium is a lichenized genus of fungi within the Placynthiaceae family. Members of this genus are commonly called blackthread lichens.

Placostigma

Plaenterwald

He cabbage-tree

Plack (software)

Placostylus ambagiosus consobrinus

Pladaroxylon leucadendron

Placynthiella

Plae Chow

Placopecten magellanicus

Placospermum

Placosaris perakalis

Placitate

Placoptila choromima

Plaek Pibulsonggram

Placiti Cassinesi

Placitas, NM

Placitas

Bulimus (Placostylus) cuniculinsulae Cox, 1872

Placomaronea

Placoptila lucicincta

Placodus (meaning 'flat tooth') was a genus of marine reptiles, belonging to the order Placodontia, which swam in the shallow seas of the middle Triassic period (c. 240 million years ago). Fossils of Placodus have been found in Central Europe (Germany, France, Poland) and China.

Placocarpus

Placostylus eddystonensis

Placoid fishes

Placing of Seamen Convention, 1920

Plaek Phibulsongkram

Placitas, Doña Ana County, New Mexico

Placosaris arjunoalis

Placostromella

Placitas, New Mexico

Placoptila cyclas

Placodiscus attenuatus

Placosternus erythropus

Placzki, Greater Poland Voivodeship

Plactic monoid

The Placitum of Riziano (Italian: Placito del Risano) was a dispute that took place c. 804 around the river Riziano, probably at Rižana in modern Slovenia. Legates sent by Charlemagne heard complaints by the leaders of Istria about the bishops and the duke of Istria, John. It is an important document for Istrian history. The document is believed to have been recorded on the orders of Fortunatus II, patriarch of Grado. A point of historiographical contention is the fact that only the leaders of the coastal towns of Istria were present; one explanation for this is that the issues being discussed (for example, the abolition of the right of the townspeople to fish) only affected the coast.

Placus

Placoderm

Placostola

The Placzek transient is a phenomenon studied in nuclear engineering. The Placzek transient occurs when a population of monoenergetic neutrons of energy E elastically scatter within a homogeneous medium. In each collision the neutrons impart a fraction of their energy to the nuclei in the medium, losing up to a maximum of where A is the atomic number of the medium. In nuclear engineering, neutrons that have not yet undergone a collision are called the 1st generation, those that have undergone a single collision are the 2nd generation, those that have undergone two collisions are the 3rd generation, and so on. The neutrons from each generation collectively form the total neutron population within the medium. The Placzek transient is a discontinuity of the neutron flux, and derivatives of the flux, at integer multiples of . The transient results from the fact that after the 1st generation, every neutron can have at minimum an energy of due to elastic scattering. Those neutrons that have energy less than can only consist of neutrons in the 2nd, 3rd, or latter generations. This trend repeats itself at each multiple of . Thus, the discontinuity in the flux arises from the fact that at each multiple of the neutron flux is accumulated from one fewer neutron generation to the left of the discontinuity than to the right. The Placzek transient can be derived analytically by solving for the neutron flux using a piecewise function solution to a differential equation involving a Heaviside step function in energy intervals of width . The transient can also be observed in some special case Monte Carlo neutron transport simulation codes.

Placochelys

Placobranchus ianthobaptus

Placopleurus

Placostylus eddystonensis is a species of air-breathing land snail, a pulmonate gastropod mollusk in the family Bothriembryontidae. This species is endemic to New Caledonia.

The Placzek transient is a phenomenon studied in nuclear engineering. The Placzek transient occurs when a population of monoenergetic neutrons of energy E elastically scatter within a homogeneous medium. In each collision the neutrons impart a fraction of their energy to the nuclei in the medium, losing up to a maximum of

Plack

Placochelyidae

Placzewo

Placostylus ambagiosus keenorum

Placotome truncapex

Placoptila

Placodes roseus

Placodes ulmarius

Placé

Placosaris steelei

Placosphaeria platani

Placospongia

Placostylus ambagiosus priscus

Placozoan

Plackweghöhe

Placobdella parasitica

†Placostylus cuniculinsulae was a species of large air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Bothriembryontidae. This species was endemic to Lord Howe Island, Australia. It is now extinct.

Placzkowo, Gniezno County

Placodiod lichen

Placseptalia

Placostylus ambagiosus gardneri

Placochilus

Placque

Placodontidae

Placocheilus

Placynthium

Plackett–Burman designs are experimental designs presented in 1946 by Robin L. Plackett and while working in the British Ministry of Supply.Their goal was to find experimental designs for investigating the dependence of some measured quantity on a number of independent variables (factors), each taking L levels, in such a way as to minimize the variance of the estimates of these dependencies using a limited number of experiments. Interactions between the factors were considered negligible. The solution to this problem is to find an experimental design where each combination of levels for any pair of factors appears the same number of times, throughout all the experimental runs (refer to table). A complete factorial design would satisfy this criterion, but the idea was to find smaller desig

Placinta

Plad

Placodiscus pseudostipularis

Placoparia

Placophobia

Placoclytus distortus

Placostylus ambagiosus pandora

Placoschema

Placosaris ingestalis

Placoptila is a genus of moth in the family Cosmopterigidae.

Placoptila semioceros

Placoclytus distortus is a species of beetle in the family Cerambycidae. It was described by Chevrolat in 1860.

Placostylus ambagiosus hinemoa

Placodiscus bancoensis is a species of plant in the family Sapindaceae. It is found in Ivory Coast and Ghana. It is threatened by habitat loss.

Placostylus

Placodes incanus

Placodes fraxineus

Placosaris udealis is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in India (Assam).

Placzki

Placobranchus ocellatus

*Stagmatophora semioceros (Meyrick, 1935)

Placosoma is a genus of fungi in the Asterinaceae family. The relationship of this taxon to other taxa within the class is unknown (incertae sedis), and it has not yet been placed with certainty into any order.

Placodothis petrakii

Placoclytus

Placosternus is a genus of beetles in the family Cerambycidae, containing the following species:
* Placosternus crinicornis (Chevrolat, 1860)
* Placosternus difficilis (Chevrolat, 1862)
* Placosternus erythropus (Chevrolat, 1835)
* Placosternus guttatus (Chevrolat, 1860)

Placodiscus bancoensis

Placonia

Placing

Plackett–Burman designs are experimental designs presented in 1946 by Robin L. Plackett and while working in the British Ministry of Supply.Their goal was to find experimental designs for investigating the dependence of some measured quantity on a number of independent variables (factors), each taking L levels, in such a way as to minimize the variance of the estimates of these dependencies using a limited number of experiments. Interactions between the factors were considered negligible. The solution to this problem is to find an experimental design where each combination of levels for any pair of factors appears the same number of times, throughout all the experimental runs (refer to table). A complete factorial design would satisfy this criterion, but the idea was to find smaller designs. For the case of two levels (L = 2), Plackett and Burman used the method found in 1933 by Raymond Paley for generating orthogonal matrices whose elements are all either 1 or −1 (Hadamard matrices). Paley's method could be used to find such matrices of size N for most N equal to a multiple of 4. In particular, it worked for all such N up to 100 except N = 92. If N is a power of 2, however, the resulting design is identical to a fractional factorial design, so Plackett–Burman designs are mostly used when N is a multiple of 4 but not a power of 2 (i.e. N = 12, 20, 24, 28, 36 …). If one is trying to estimate less than N parameters (including the overall average), then one simply uses a subset of the columns of the matrix. For the case of more than two levels, Plackett and Burman rediscovered designs that had previously been given by Raj Chandra Bose and at the Indian Statistical Institute.Plackett and Burman give specifics for designs having a number of experiments equal to the number of levels L to some integer power, for L = 3, 4, 5, or 7. When interactions between factors are not negligible, they are often confounded in Plackett–Burman designs with the main effects, meaning that the designs do not permit one to distinguish between certain main effects and certain interactions. This is called or confounding.

Placomaronea is a genus of lichenized fungi in the Lecanoraceae family.

Plack (horse)

Plackovica

Placostylus ambagiosus michiei

Placostylus bollonsi bollonsi

Placzkowo, Gostyn County

Placocarpus is a genus of lichens in the family Verrucariaceae. The genus was circumscribed by Italian botanist Vittore Benedetto Antonio Trevisan de Saint-Léon in 1860.

Placostylus hongii

*Lachanodes section Pladaroxylon (Endl.)

*Placodium sect. Aspiciliopsis (Müll. Arg.(1884)

Placostylus porphyrostomus

Placoeme

Placodioid lichen

Placopsis

Placynthiopsis

Plackets

Placoparia is a genus of trilobites of average size (up to 6 cm) that lived during the late Lower to the early Upper Ordovician on the paleocontinents Gondwana, Avalonia and Laurentia, now the Czech Republic, France, Germany, Morocco, Portugal, Spain and Wales. Its headshield (or cephalon) is semi-circular to rectangular with rounded frontal corners. It lacks eyes, but eye ridges are present. The fact that the facial sutures are opisthoparian (with sutures in Pliomera gonatoparian) is an exception in the otherwise proparian Cheirurina. The thorax has 11 or 12 segments, with the axis slightly wider than the ribs (or pleurae) to its sides. The tips of the pleurae are free, which resembles an old-fashion central heating radiator. The axis in the small tailshield (or pygidium) consists of four

Placuna placenta

Placoasterina

Placopyrenium

Pladaroxylon

Placosaris swanni

Placoparmelia is a genus of lichenized fungi within the Parmeliaceae family. The genus is monotypic, containing the single species Placoparmelia patagonica, found in Argentina.

Placosaris perakalis is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found in Malaysia.

Placing of Seamen Convention

Placosaris labordalis is a species of moth of the Crambidae family described by Pierre Viette in 1958. It is found in eastern Madagascar. Its wingspan is 20–23 mm, with a length of the forewings of 9.5–11 mm. Its pattern is close to Placosaris triticalis. The holotype had been collected near in eastern Madagascar.

Placoptila semioceros is a moth in the family Cosmopterigidae. It is found in Taiwan.

Plactic ring

Placosaris bornealis

Placodothis is a genus of fungi in the class Dothideomycetes. The relationship of this taxon to other taxa within the class is unknown (incertae sedis). Also, the placement of this genus within the Dothideomycetes is uncertain. A monotypic genus, it contains the single species Placodothis petrakii.

Placosaris arjunoalis is a moth in the family Crambidae. It was described by Munroe and Mutuura in 1970. It is found on Java.

Placoidioid

Placket

Plackwald

Placitum generalis

The Placitum of Riziano (Italian: Placito del Risano) was a dispute that took place c. 804 around the river Riziano, probably at Rižana in modern Slovenia. Legates sent by Charlemagne heard complaints by the leaders of Istria about the bishops and the duke of Istria, John. It is an important document for Istrian history. The document is believed to have been recorded on the orders of Fortunatus II, patriarch of Grado. A point of historiographical contention is the fact that only the leaders of the coastal towns of Istria were present; one explanation for this is that the issues being discussed (for example, the abolition of the right of the townspeople to fish) only affected the coast. The Latin text has been edited many times, but the standard edition is by Manaresi . The text has been translated into various modern languages.

Placopecten

Placydow

Placoda unguis

Placitum of Riziano

Placosoma (lizard)

Placostylus bollonsi

Placoid Fishes

Placodothis

Placosaris galogalis

Placita Olvera

Placzki, Lodz Voivodeship