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Glossary entry

Russian term or phrase:

пятеричная симметрия

English translation:

fivefold symmetry

Added to glossary by Yuriy Sokha (X)
Aug 19, 2008 19:07
15 yrs ago
Russian term

пятеричная симметрия

Russian to English Science Chemistry; Chem Sci/Eng
В тексте идет речь о пространственном строении молекул типа карборана (двадцать треугольников образуют замкнутую объемную фигуру - икосаэдр). Дается обобщающее название - молекулы с пятеричной симметрией. Какой наиболее точный эквивалент выбрать? Quinary symmetry отпадает сразу, fivefold symmentry ассоциируется с плоскими фигурами, a icosahedral symmetry слишком уж далека от оригинала.
Может быть, кто-нибудь знает устоявшиеся эквиваленты?
Рисунки есть вот здесь: http://www.krugosvet.ru/articles/112/1011289/1011289a1.htm
Спасибо заранее.
Proposed translations (English)
4 +1 fivefold symmetry
2 penternary symmetry

Discussion

Yuriy Sokha (X) (asker) Aug 20, 2008:
the Pauli principle Thank you, James. I guess it’s a more complicated issue as the fivefold symmetry is prohibited by the Pauli principle. I would rather prefer to use 'icosahedral symmetry' as a strictly scientific term.
James McVay Aug 20, 2008:
"Fold" terminology "Fold" together with a number, as in "twofold," threefold," "fourfold," is commonly used in talking about symmetry -- and not only in mathematics. As far as the terminology is concerned, I don't think that it matters whether the molecule itself or fragments of it exhibit the symmetry. BTW, words like "bifold" and "trifold" are also used, although more rarely. Usage becomes even more rare for combinations above "tri.".
Yuriy Sokha (X) (asker) Aug 20, 2008:
пятЕричная (очепятка)
Yuriy Sokha (X) (asker) Aug 20, 2008:
Проблема в том, что, по-моему, подразумевается пятиричная симметрия не самой молекулы, а отдельных ее фрагментов (условно соответствующих граням икосаэдра).

Proposed translations

+1
22 mins
Selected

fivefold symmetry

...
Example sentence:

The fivefold symmetry of the carborane cage is slightly distorted because of small differences between the basal B--B bond lengths.

Reference:

http://scripts.iucr.org/cgi-bin/paper?S0108270193011783

Note from asker:
Thank you, James!
Peer comment(s):
agree svetlana cosquéric : www.rsc.org/ej/DT/2006/b611399k.pdf
1 hr
Thanks!
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4 KudoZ points awarded for this answer.
7 mins

penternary symmetry

Penternary seems to be used mainly in the context of encoding, not sure about molecular structures.
Note from asker:
Thank you, Jack!
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