Science

Morphine

Morphine

Morphine Definition Morphine is a highly addictive drug derived from opium and used to treat intractable pain, as in severe injury or metastatic cancer. It is a naturally occurring member of a large chemical class of compounds called alkaloids. The name, which derives from Morpheus (the mythologi.....

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Yttrium

Yttrium

Yttrium Definition Yttrium is a silvery metallic element found in the same ores as elements of the lanthanide series. It is almost always found in combination with lanthanide elements in rare-earth minerals, and is never found in nature as a free element. Y is the only stable isotope, and the onl.....

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Converting Percent to Fraction and Decimal

Converting Percent to Fraction and Decimal

Converting Percent to Fraction and Decimal When we talk, we often use different words to express the same thing. For example, we could describe the same car as tiny or little or small. All of these words mean the car is not big. Fractions, decimals, and percents are like the words tiny, little, a.....

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Palmitic Acid

Palmitic Acid

Palmitic Acid Definition Palmitic acid is a saturated fatty acid occurring as combustible white crystals in many natural oils (such as spermaceti and palm oil) and fats. Palmitic acid is most commonly produced from palm oil, although it is found in smaller amounts in other vegetable oils as well .....

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Bastnäsite

Bastnäsite

Bastnäsite Definition Bastnäsite is a rare yellow to reddish-brown mineral consisting of a carbonate of fluorine and several lanthanide metals. It occurs in association with zinc and is a source of the lanthanides. Bastnaesite is commonly associated with other rare-earth-bearing minerals such a.....

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Catatonia

Catatonia

Catatonia Definition Catatonia is an abnormal condition often associated with schizophrenia and variously characterized by stupor, stereotypy, mania, and either rigidity or extreme flexibility of the limbs. It was first described in 1874 by Karl Ludwig Kahlbaum, in Die Katatonie Oder das Spannung.....

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Plastid

Plastid

Plastid Definition Plastid is an organelle found in the cells of plants, green algae, red algae, and certain other protists. Like mitochondria, plastids have an inner and outer membrane, and contain their own DNA and ribosomes. Some plastids, such as the chloroplasts in plant leaves, contain pigm.....

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Determining Percentage

Determining Percentage

Determining Percentage Percent means “for every 100” or “out of 100.” The (%) symbol as a quick way to write a fraction with a denominator of 100. As an example, instead of saying “it rained 14 days out of every 100,” we say “it rained 14% of the time.” Exa.....

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Neodymium

Neodymium

Neodymium Definition Neodymium is a shiny, silvery metallic element of the lanthanide series. It is present in significant quantities in the ore minerals monazite and bastnäsite. Its atomic number 60; atomic weight 144.24; melting point 1,024°C; boiling point 3,027°C; specific gravity 6.80 or .....

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Cyanobacteria

Cyanobacteria

Cyanobacteria Definition Cyanobacteria are any of a phylum of photosynthetic bacteria that live in water or damp soil and were once thought to be plants. The name “cyanobacteria” comes from the color of the bacteria (Greek: κυανός (kyanós) = blue). Cyanobacteria (which are prok.....

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Comparing Decimal Numbers

Comparing Decimal Numbers

Comparing Decimal Numbers If there are two decimal numbers we can compare them. One number is either greater than, less than or equal to the other number. A decimal number is just a fractional number. Comparing 0.7 and 0.07 is clearer if we compared 7/10 to 7/100. The fraction 7/10 is equivalent .....

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Paranoia

Paranoia

Paranoia Definition Paranoia is a psychotic disorder characterized by systematized delusions, especially of persecution or grandeur, in the absence of other personality disorders. It is a state of mind in which a person believes that others are trying to harm them. Paranoia is distinct from phobi.....

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