- Zeitschriftendaten
- Format
- Zeitschrift
- eISSN
- 2719-9509
- Erstveröffentlichung
- 01 Jan 1992
- Erscheinungsweise
- 4 Hefte pro Jahr
- Sprachen
- Englisch
Suche
- Uneingeschränkter Zugang
A Curing Chamber with Air Circulation / Klimakammer mit Luftumwälzung
Seitenbereich: 35 - 38
Zusammenfassung
For chemical and physical tests samples of homogeneous tobaccos of uniform humidity are required. To this end a curing chamber was constructed allowing conditioning of cigarettes and tobacco in very short time. The new apparatus can also be used for determining the hygroscopic compensation of different blends. Compared with conventional machines operating according to the same principle with pressure reduction, saturated salt solutions and air circulation it offers considerable improvements regarding duration and uniformity of conditioning
- Uneingeschränkter Zugang
Experiences with a New Curing Chamber / Erfahrungen mit einer neuen Klimakammer
Seitenbereich: 39 - 43
Zusammenfassung
The new chamber constructed by the BAT can be used for conditioning tobacco and cigarettes by aid of saturated salt solutions. If a solution of ammonium nitrate is used, an equalization of humidity of±0.1% H2O is achieved after 7-16hours of conditioning. The established disadvantages, in particular the insufficient temperature constancy, are of minor importance for the requirements in practice
- Uneingeschränkter Zugang
Sorption Isotherms of Some Cigarette Brands / Sorptions-Isothermen einiger Cigarettensorten
Seitenbereich: 45 - 54
Zusammenfassung
The equilibrium of desorption of 6 cigarette brands has been established for a certain range. It is shown that a relative air humidity of 63 % is to be recommended for the tested cigarettes of the blend, straight-Virginia and Oriental type. Adjusting of Maryland cigarettes to the claimed humidity value is achieved at a relative air humidity of about 72 %.
- Uneingeschränkter Zugang
Short-term Tests for the Detection of Carcinogenic Substances / Methoden zur Schnelltestung cancerogener Substanzen
Seitenbereich: 55 - 62
Zusammenfassung
For the detection of carcinogenic activity various short-term tests are being described which are based on particular characteristics of known carcinogenic substances. Thus microscopic cellular changes are observed in tissue cultures, mutations of microorganisms can be produced, and under certain conditions carcinogenic substances inhibit existing malignant growth. In the paramecium test positive results are brought about by the fluorescing power of some carcinogens, early changes of the skin can be observed in the sebaceous gland and the newt test. It is shown that all known short-term tests for determining carcinogenic activity of chemical compounds are not specific. They are mostly based on one quality out of the entire spectrum of particular characteristics. The sebaceous gland and the newt tests, however, are of special interest. Numerous questions regarding formal genesis and applicability in practice require further examinations
- Uneingeschränkter Zugang
A Method for Analysing the Complex Environmental Influences Exerted on Plants and the Separation into the Individual Components Soil and Weather Factor in the Case of Tobacco / Über eine Methode zur Trennung der komplexen „Umweltwirkung“ auf Pflanzen in die beiden Komponenten Bodeneinfluss und Witterungswirkung, dargestellt am Tabak
Seitenbereich: 63 - 69
Zusammenfassung
The exact arrangement of experimental results on plants - in this case tobacco - in relation to their dependence on all possible ''controllable conditions'' such as soil, manuring, management, breeding, cultivation and so on, is only possible after taking account of the effect of the weather; i.e. of the uncontrollable forces of the atmosphere. Consequently, allowance for the weather factor, with the help of the ''weather index number'', plays a great part in the evaluation of all research carried out in the open or in greenhouses without control of climate. These methods relieve the research worker from the constraint of observing a large number of plants for very many years, and makes it possible, apart from long period averages, to arrive at valid results for an individual case. Weather index numbers, which for the above reason are of such great importance, are obtained from an ''Isokarpendiagram'' (4, 5, 6, 7). All the surrounding influences which combine to operate on plants can then be presented, separated into their individual components in the form of a special ''Soil-weather-diagram''.
- Uneingeschränkter Zugang
Standardized regulations for the analysis of tobacco and tobacco smoke / Einheitliche Vorschriften für die Analyse von Tabak und Tabakrauch
Seitenbereich: 71 - 72
Zusammenfassung
5. Vorschrift für die Bestimmung der Feuchtigkeit im Tabak
5.1 Bestimmung der Tabakfeuchtigkeit durch Destillation mit Benzol
5.2 Bestimmung der Tabakfeuchtigkeit mit Trockenschrank