نتایج جستجو برای: tobacco leaves

تعداد نتایج: 131413  

Journal: :international journal of occupational and environment medicine 0
t saleeon college of public health science, chulalongkorn university, bangkok, thailand w siriwong college of public health science, chulalongkorn university, bangkok, thailand and thai fogarty itreoh center, chulalongkorn university, bangkok, thailand hl maldonado-pérez school of environmental and biological sciences, rutgers university, new jersey, usa mg robson thai fogarty itreoh center, chulalongkorn university, bangkok, thailand and school of environmental and biological sciences, rutgers university, new jersey, usa

background: traditional thai tobacco (nicotiana abacus l.) is known as a non-virginia type whose mature leaf contains three to four times more nicotine than that of a virginia type. as such, the process of thai traditional tobacco production may lead to adverse health effects such as green tobacco sickness (gts). objective: to investigate the prevalence of gts and risk factors related to gts am...

2017
Nahid Moghbel BoMi Ryu Angela Ratsch Kathryn J. Steadman

A range of endemic Nicotiana species are chewed as a smokeless tobacco by several Aboriginal populations of Australia. In tobacco research, nicotine to nornicotine conversion is important because nornicotine lowers tobacco quality and is detrimental to health. A diverse group of cytochrome P450 genes with different transcriptional regulations are involved in this conversion. The primary aims of...

2011
Huimin Man Stephan Pollmann Elmar W. Weiler Edward G. Kirby

The initial reaction in the pathway leading to the production of indole-3-acetic acid (IAA) in plants is the reaction between chorismate and glutamine to produce anthranilate, catalysed by the enzyme anthranilate synthase (ASA; EC 4.1.3.27). Compared with non-transgenic controls, leaves of transgenic poplar with ectopic expression of the pine cytosolic glutamine synthetase (GS1a; EC 6.3.1.2) pr...

Journal: :Journal of nematology 1973
P M Miller N C Turner H Tomlinson

Plant extracts, made by grinding 2 g of fresh tissue in 5 ml of water, were toxic to Tylenchorhynchus dubius and Hoplolaimus spp. Such extracts from leaves and stems of bean (Phaseolus vulgaris L.) and leaves of tobacco (Nicotiana tabacum L.) were most toxic; those from leaves of corn (Zea mays L.), tomato (Lycopersicon esculentum Mill.) and rhododendron (Rhododendron catawbiense L.) were less ...

Journal: :Environmental health and preventive medicine 2001
M Sugita T Izuno M Tatemichi Y Otahara

Consumed substances, including food, drink, and tobacco, produced in the environment are exposure sources of Cd. The object of the present study was to estimate Cd exposure and absorption amount from smoking cigarettes, one exposure source of Cd, using recent findings from Japan. The market share of cigarettes produced in foreign countries has increased in Japan, the proportion of tobacco leave...

Journal: :Plant physiology 1992
B A Bailey A Avni N Li A K Mattoo J D Anderson

Ethylene is a plant hormone that influences many aspects of plant growth and development (10). The biosynthetic pathway of ethylene production in higher plants is well defined. The rate-limiting step in this pathway is the reaction catalyzed by ACC' synthase (S-adenosyl-L-methionine methyl-thioadenosine-lyase, EC 4.4.1.4), which converts Sadenosyl-L-methionine to ACC. Tobacco (Nicotiana tabacum...

Journal: :Plant physiology 1968
I Zelitch P R Day

The hypothesis that net photosynthesis is diminished in many plant species because of a high rate of CO(2) evolution in the light has been tested further. High rates of CO(2) output in CO(2)-free air in comparison with dark respiration were found in Chlamydomonas reinhardi, wheat leaves, tomato leaves, and to a lesser extent in Chlorella pyrenoidosa by means of the (14)C-photorespiration assay....

Journal: :Plant physiology 2001
S Wilkinson A L Clephan W J Davies

Commelina communis stomata closed within 1 h of transferring intact plants from 27 degrees C to 7 degrees C, whereas tobacco (Nicotiana rustica) stomata did not until the leaves wilted. Abscisic acid (ABA) did not mediate cold-induced C. communis stomatal closure: At low temperatures, bulk leaf ABA did not increase; ABA did not preferentially accumulate in the epidermis; its flux into detached ...

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