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Periodical

periodical

1. Of or pertaining to a period or periods, or to division by periods. The periodicaltimes of all the satellites. (Sir J. Herschel)

2. Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.

3. Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics. The periodic return of a plant's flowering. (Henslow) To influence opinion through the periodical press. (Courthope)

4. Of or pertaining to a period; constituting a complete sentence. Periodic comet, the generalisation that the properties of the chemical elements are periodic functions of their atomic wieghts. In other words, if the elements are grouped in the order of their atomic weights, it will be found that nearly the same properties recur periodically throughout the entire series. The arrangement of the atomic weights shows the regular recurrence of groups, each consisting of members of the same natural family.

A similar relation had been enunciated in a crude way by Newlands; but the law in its effective form was developed and elaborated by Mendelejeff, whence it is sometimes called Mendelejeff's law. Important extensions of it were also made by L. Meyer. By this means Mendelejeff predicted with remarkable accuracy the hypothetical elements ekaboron, ekaluminium, and ekasilicon, afterwards discovered and named respectively scandium, gallium, and germanium.

(Science: astronomy) periodic star, the time of a complete revolution of the body about the sun, or of a satellite about its primary.

Origin: L. Periodicus, Gr., cf. F. Periodique.


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HPLEASE HELP! How to cite this book for my biology report?

... information. The example you listed: Jones E. and Smith B. 2010. Title. Journal vol. pp. Chapter, Publisher, City, State is for a peer-reviewed, periodical publication such as Nature or Science . For a chapter from a book, you would use this example from the link you provided: Chapter in a book ...

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by Luxorien
Fri Mar 09, 2012 7:44 pm
 
Forum: Microbiology
Topic: HPLEASE HELP! How to cite this book for my biology report?
Replies: 2
Views: 1568

How do you grow an isolated colony of e.coli from scratch?

... culture too! and then grow to arround 0.6 OD, is this correct! that much LB! and how do i measure the OD of such a vast volume, do I have to take periodical samples from the micture to test or can I measure the OD of the entire conical flask!? In terms of harvesting methods i have found mention ...

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by mbyyas
Tue Nov 21, 2006 10:51 pm
 
Forum: Microbiology
Topic: How do you grow an isolated colony of e.coli from scratch?
Replies: 4
Views: 19380

The Fiber Disease

... from a page one article in "Nature," dated May 4, 2006. Direct quotations are shown in double quotes. This very highly respected periodical is read by scientists of various disciplines worldwide, with headquarters in London, UK. It is considered an impressive accomplishment for ...

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by tamtam
Tue Jun 06, 2006 8:37 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 4989497

Hunger?

... stomach hurt our self, so that the hunger felling increases.then if this goes for a long time we get maag.(the same as me) yes, that why we eat at periodical time. our stomach produce HCl at those time where is the time we often eat. about Oxygen, as your and my post above it is still needed to ...

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by baikuza
Thu Jan 26, 2006 7:24 am
 
Forum: Physiology
Topic: Hunger?
Replies: 34
Views: 13623

magnetosomes

Proceedings of the National Academy of Science (of the United States) is a periodical publication. And, if I am not wrong, they change volume every year. As for page 13000 this is just because they keep the pagination continuing of each monthly issue of the journal, ...

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by canalon
Mon Oct 24, 2005 1:08 pm
 
Forum: Microbiology
Topic: magnetosomes
Replies: 12
Views: 6196


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