Tsna


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Tsna

 

a river in Tambov and Riazan’ oblasts of the RSFSR; a left tributary of the Moksha River (Volga basin). The Tsna is 451 km long and drains an area of 21,500 sq km. It flows northward through the Oka-Don Plain. The river is fed primarily by snow. High water occurs in April or early May. The average flow rate 139 km from the mouth is 46 cu m per sec. The river usually freezes over in November or December, but its upper course sometimes remains open until January. The ice breaks up in late March or April. A hydroelectric power plant is situated on the river, and there is local navigation. The cities of Kotovsk, Morshansk, Tambov, and Sasovo are on the river.


Tsna

 

a river in Kalinin Oblast, RSFSR; a tributary of Lake Mstino. The river is 160 km long and drains an area of 4,420 sq km. It rises in the Valdai Hills and flows through the Vyshnii Volok Reservoir before emptying into Lake Mstino. The Tsna is fed by mixed sources, mainly snow. The mean flow rate 38 km from the mouth is 12.3 cu m per second. The river freezes between November and January, and the ice breaks up in March or April. The Tsna is used for timber flotation.

References in periodicals archive ?
As is known, TSNAs can cause cancer, and NNK that is one of N-nitroso compounds can increase the amount of 8-oxo deoxyguanosine in DNA by causing single-chain fractures (45).
TSNA is engaged in the manufacture of sheet metal components such as fuel tanks, frames and chassis parts for various two-wheeler manufacturers in India.
StarCured smokeless tobacco has TSNA levels at least 80% lower than those in Swedish snus.
was Advance cigarettes, which use StarCured tobacco as well as burley and oriental tobaccos that were selected for their naturally low TSNA content.
TSNAs, such as NNK, are potent lung carcinogens, and some TSNAs form from nicotine on indoor surfaces through chemical reactions with ambient nitrous acid (Hecht 2003).
Both the filter-paper and wipe samples were analyzed, showing that ambient nitrous acid levels were able to produce TSNAs by reaction with nicotine.
He points out, "The quantities of TSNAs on the paper were only those collected after three days of one person smoking ten cigarettes per day.
The authors report that in laboratory tests using cellulose as a model indoor material exposed to smoke, levels of newly formed TSNAs detected on cellulose surfaces were 10 times higher than those originally present in the sample following exposure for three hours to a "high but reasonable" concentration of nitrous acid (60 parts per billion by volume).
Dermal uptake of the nicotine through a child's skin is likely to occur when the smoker returns and if nitrous acid is in the air, which it usually is, then TSNAs will be formed," said Lara Gundel, one of the study authors.