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Potassium fluoride is prepared by dissolving potassium carbonate in excess hydrofluoric acid .

A kind of skin cell called a keratinocyte moves itself by rolling , as part of the process of healing .

Keratinocytes , a type of skin cell , migrate with a rolling motion during the process of wound healing .

In pre-modern society , the ordeal typically ranked along with the oath and witness accounts as the central means by which to reach a judicial verdict .

In pre-modern society , the ordeal typically was done together with the oath and witness accounts as the central means by which to reach a verdict .

Emission nebulae sometimes look like they have dark areas in them .

Phytohormones are found across the plant kingdom , and even in algae , where they have similar functions to those seen in higher plants .

Phytohormones are found not only in higher plants , but in algae too , with similar functions .

Potassium ions are very important to organisms .

Potassium ions are vital for the functioning of all living cells .

The function of the reaction center chlorophyll is to use the energy transferred to it from the other chlorophyll pigments to undergo a specific redox reaction .

The function of the reaction center of chlorophyll is to absorb light energy and transfer it to other parts of the photosystem .

He died on 21 June 2014 from acute respiratory failure after being hospitalized with pneumonia .

He died on June 21 , 2014 from acute respiratory failure after being hospitalized with pneumonia , aged 88 .

Since the mid 20th century , citadels commonly enclose military command and control centers , rather than cities or strategic points of defense on the boundaries of a country .

The orbits of centaurs are unstable due to perturbations by the giant planets .

Boiling tubes are commonly made from Pyrex glass which can tolerate high temperatures .

During an autopsy , bruises accompanying abrasions indicate the abrasions occurred while the individual was alive , as opposed to damage incurred post mortem .

During an autopsy , bruises accompanying abrasions indicate the abrasions occurred while the person was alive , as opposed to damage that occurred after death

Ethnic separatism is based more on cultural and linguistic differences than religious or racial differences , which also may exist .

Ethnic separatism is based more on differences in culture and language than religious or racial differences .

The garrison consisted of infantry or cavalry auxilia , not components of Roman legions .

The garrison were auxiliaries , Roman infantry or cavalry units , not parts of Roman legions .

Germany is a federal , parliamentary , representative democratic republic .

These enzymes are found in bacteria and archaea and provide a defence mechanism against invading viruses .

Resonant loop antennas are relatively large , governed by the intended wavelength of operation .

The adversarial system is the two -sided structure under which criminal trial courts operate , putting the prosecution against the defense .

Plant breeding started with sedentary agriculture and particularly the domestication of the first agricultural plants , a practice which is estimated to date back 9,000 to 11,000 years .

Swift died at home in London from respiratory failure on 1 February 2019 , aged 82 .

Steppenwolf is an immortal with superhuman strength , speed and stamina appropriate to his race .

Steppenwolf is an immortal with vast superhuman strength , endurance and speed , capable of lifting about one hundred tons and jumping huge distances easily .

So , in normal diploid organisms , chromosomes are present in two copies .

So , in normal diploid organisms , autosomal chromosomes are present in two copies .

A person with astraphobia will often feel anxious during a thunderstorm even when they understand that the threat to them is minimal .

Dumor died suddenly on 18 January 2014 , in London after suffering cardiac arrest .

Elliptical galaxies range in shape from nearly spherical to nearly flat , and in size from hundreds of millions to over one trillion stars .

Elliptical galaxies range in size from tens of millions to over one hundred trillion stars .

Walls that use large stones put together without any attempt at courses is called rubble walling .

The order includes about 2500 - 2800 species from 85 - 90 genera , which comprise seven families of trees and shrubs .

The drought caused a lot of desertification .

One effect of the drought was widespread desertification .

Cenote water is often very clear , as the water comes from rain water infiltrating slowly through the ground .

Cenote water is often very clear , as the water comes from rain water filtering slowly through the ground , and therefore contains very little suspended particulate matter .

Histones undergo posttranslational modifications that alter their interaction with DNA and nuclear proteins .

If an algebraic equation is over the rationals , it can always be converted to an equivalent one , where all the coefficients are integers .

A polynomial equation over the rationals can always be converted to an equivalent one in which the coefficients are integers .

A tandem repeat pattern helps determine an individual 's inherited traits .

Most dolmen constructions they were build using stone slabs of big dimensions .

The elytra act as protective wing -cases for the hind wings underneath , which are used for flying .

The elytra primarily serve as protective wing -cases for the hindwings underneath , which are used for flying .

In the 1930 season , the league considerably liberalized the passing rules , effectively eliminating offsides .

Most of the finer sort of medieval manuscripts , whether illuminated or not , were written on vellum .

Most of the best sort of medieval manuscripts were written on vellum .

Gregorian chant was traditionally sung by choirs of men and boys in churches , or by men and women of religious orders in their chapels .

The parish is entirely rural in character , the northeast being moorland and the southwest lower lying farmland .

At the base of the bacterial flagellum , where it enters the cell membrane , a motor protein acts as a rotary engine .

Advances in semiconductor technology reduced transistor size ; multicore CPUs have appeared where multiple CPUs are implemented on the same silicon chip .

Besides material characterization , the material scientist or engineer also deals with extracting materials and converting them into useful forms .

Blobfish are often caught accidentally in bottom trawling nets .

Adult and larval leaf beetles feed on all sorts of plant tissue , and all species are fully herbivorous .

As a seasonal folivore and frugivore , the proboscis monkey eats primarily fruit and leaves .

Although American units were usually able to replenish their numbers quickly , the replacements rarely had sufficient tactical training .

Linear regression was the first type of regression analysis to be studied rigorously .

Linear regression was the first type of regression analysis to be studied rigorously , and to be used extensively in practical applications .

With unarticulated wheels , climbing obstacles will cause the body of a vehicle to tilt .

Until recently , people thought only vertebrates had electroreception .

Until recently , electroreception was known only in vertebrates .

Some carbocations such as the 2 - norbornyl cation exhibit more or less symmetrical three - center two -electron bonding .

Perjury is considered a serious offense , as it can be used to usurp the power of the courts , resulting in miscarriages of justice .

Tonic immobility has also been said to occur in humans that are subject to intense trauma , such as rape or sexual assault .

Thermal resistivity is the opposite of thermal conductivity .

Together with stratigraphic principles , radiometric dating methods are used in geochronology to establish the geologic time scale .

Historically , many rhizarians were considered animals because of their motility and heterotrophy .

Historically , many rhizarians were considered animals , with their movement and heterotrophy as justification .

Oats are also commonly used as feed for horses when extra carbohydrates and the subsequent boost in energy are required .

Black contributed to basic scientific and clinical knowledge in cardiology , both as a physician and as a basic scientist .

Flora and fauna are relatively scarce due to the harsh climate .

The two most common quantifiers are the universal quantifier and the existential quantifier .

Bangladesh is used as a transit route for narcotics produced in neighboring countries .

The rugged coastline has been the scene of a number of shipwrecks .

Cerebellar ataxia is ataxia that is caused by a problem with a person 's cerebellum .

The term cerebellar ataxia is used to indicate ataxia that is due to dysfunction of the cerebellum .

Kodkods are equally active during the day and during the night , although they only venture into open terrain under the cover of darkness .

New Zealand is a constitutional monarchy with a parliamentary democracy , although its constitution is not codified .

New Zealand is a constitutional monarchy and parliamentary democracy .

Chemical vapor deposition is also a widely used high temperature method for the preparation of coatings and semiconductors from molecular precursors .

This concept is useful when considering degenerate conics , which may include the cylindrical conics .

This is useful in the definition of degenerate conics , which require considering the cylindrical conics .

Naloxone is useful both in acute opioid overdose and in reducing respiratory or mental depression due to opioids .

Naloxone can be used to reverse opioid overdose and to reduce the slowed breathing or mental depression that opioids can cause .

Van Vollenhoven was diagnosed with a Melanoma , a common type of skin cancer , in May 2017 .

Van Vollenhoven was diagnosed with melanoma twice in May 2017 and in November 2017 .

Many solids react readily with reactive gases such as chlorine , iodine , oxygen or others .

Many solids react vigorously with reactive gas species like chlorine , iodine , oxygen etc .

The Red Crown frequently is mentioned in texts and depicted in reliefs and statues .

A hydraulis is an early type of pipe organ that operated by converting the dynamic energy of water into air pressure to drive the pipes .

A hydraulis is an early type of pipe organ that was powered by water .

This list is in chronological order by genus .

Researchers in molecular biology use specific techniques that are typical for molecular biology , but they combine these with techniques and ideas from genetics and biochemistry .

Test pilots must have an excellent knowledge of aeronautical engineering , in order to understand how and why planes are tested .