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1
Lee, Sherman. "The effect of acute cigarette smoke exposure on regional pulmonary blood flow, volume, red cell transit and polymorphonuclear leukocyte retention in the rabbit lung". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24840.
Testo completoAbstract (sommario):
Regional pulmonary blood flow and volume was measured in ten rabbits
anesthetized with pentobarbital (30 mg/kg). Tracheostomy was performed and
catheters were placed into the jugular vein and carotid artery. The cardiac
⁹⁹mtc output was measured using the indicator-dilution technique using Tc labelled RBC followed by an injection of radiolabelled macroaggregates (MAA) to mark regional blood flow. Measurements were made both before and after either exposure to cigarette smoke (3 cigarettes for ten minutes at 4 puffs/minute) or sham exposure to air. The animals were sacrificed and the lungs were removed with the vessels tied. The lungs were then inflated and rapidly frozen over liquid nitrogen. The lungs were sampled into slices by vertical height, each slice was further sampled and then gamma counted for the injected isotopes. Regional pulmonary blood flow was calculated by setting the total lung MAA counts for each MAA equal to the cardiac output so that the sample flow was calculated as the fraction of sample counts to total counts times the cardiac output. The blood volume was marked by the labelled RBC and RBC transit was calculated as blood volume (ml) divided by blood flow (ml/sec).
In a second series of experiments (N=10) , ⁵¹Cr PMN were injected as a bolus along with ⁹⁹mtc RBC in an indicator-dilution run. Following the injection of the cells, the blood flow was marked with MAAs and then the same sham or smoke treatments were given as in the previous experiments. At the end of ten minutes, the animals were sacrificed and the lungs were processed the same as before. Regional PMN retention was calculated as the [formula omitted]. The data show that smoke exposure increased pulmonary blood volume (p<.01), pulmonary transit time (pPathology and Laboratory Medicine, Department of
Graduate
2
馮建裕 e Kin Yue Clive Fung. "The effects of non-surgical periodontal treatment on gingival suppuration, bleeding on probing and pocket depths in male tobaccosmoking and non-smoking adults". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B38628466.
Testo completo
3
Alm, David Michael. "Comparison and interaction of heat and salt stress in cultured tobacco cells". Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/445616.
Testo completoAbstract (sommario):
Cultured tobacco cells (Nicotiana tabacum L., cv Wisconsin-38) were subjected to temporary sub-lethal heat and salt shock treatments to determine the effects of these treatments on various physiological parameters after subsequent lethal heat or salt stresses. Tobacco cells developed a tolerance to a non-permissive temperature stress (54C for 14 min) when pretreated with heat shock of 38C for 2h but not when pretreated at 42C for 2h. Cells pretreated at 38 (2h) exhibited less than 30% normal growth when the 54C stress came immediately after the 38C treatment. Tolerance to the 54C stress developed with increased interval between shock and stress with cells exhibiting 95% normal regrowth when the 54C stress was administered 8h after the 38C shock. The developement of heat tolerance was inhibited if heat shock was done in the presence of a non-injuring level of EGTA (.0.5mM). Cells treated with EGTA during heat shock grew normally at 23C but not after a 54C heat stress. EDTA (0.5mM) had little effect on the acquisition of tolerance to heat stress.Wisconsin-38 cells developed a tolerance to a non-permissive salt stress (2% NaCl for 16h) when pretreated at a lower salt level (1.2% NaCl) for 3h. Cells heat shocked at 38C exhibited increased tolerance of the lethal salt stress up to 8h. Conversely, cells heat shocked at 42C exhibited immediate tolerance to lethal salt stress and this tolerance decayed over eight hours. The heat shock-induced acquisition of salt tolerance was inhibited by both EGTA and EDTA.Proteins synthesized during heat and salt stress treatments were labeled with [35S]-methionine and/or [3H]-leucine and separated using Sodium dodecylsulfate polyacrylamide gel electrophoresis. Fluorographic analysis of the gels indicate that a number of proteins are produced in response to heat shock. Similar analysis of proteins from salt shocked cells indicates that no salt shock proteins are produced in response to a brief low-level sodium chloride shock.
4
Wang, Hongying, e 汪紅英. "Studies on the mechanisms of cigarette smoke-induced apoptosis and cell proliferation in gastric epithelial cells". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B3124113X.
Testo completo
5
沈毅峰 e Ngai-fung Sham. "Study of the protective mechanisms of cigarette smoke and nicotine on experimental ulcerative colitis in rats". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31225081.
Testo completo
6
周古筠 e Ku-kwan Clara Chau. "The association of smoking and erectile dysfunction in the men's health survey". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31970412.
Testo completo
7
Parr, Sharon M. "The effects of graduated exercise at the piano on the pianist's cardiac output, forearm blood flow, heart rate, and blood pressure". Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/434086.
Testo completoAbstract (sommario):
The purpose of this study was to determine the effects of graduated exercise at the piano on the pianist's cardiac output, forearm blood flow, heart rate, and blood pressure. Also considered were the effects of piano practice conditioning, general cardiovascular conditioning, and acute cigarette smoking on the aforementioned parameters during and after graduated piano exercise.Fifteen adult pianists participated in the study. The piano exercises consisted of bilateral scales played in eight three-minute stages. Tempo was constant within stages but increased with each new stage. Cardiac output and forearm blood flow were monitored by electrical impedance utilizing a tetrapolar electrode-placement system.FindingsCardiac output, forearm blood flow, heart rate, and systolic blood pressure generally increased proportionally to exercise intensity and returned to basal levels within a five-minute recovery period.ConclusionsStrenuous piano exercise stresses the body in general, not just the active forearm muscles.The stress load placed on the heart by piano playing can be at least as great as that produced by a brisk walk.Piano playing can generate an oxygen debt in the forearm muscles.Conditioning of forearm muscles through regular piano practice results in training effect for piano playing in those muscles.Pianists who participate regularly in quality aerobic exercise programs generally begin and end piano exercise with lower heart rates than those who do not exercise. Frequently, they increase heart rates to a lesser extent during exercise and settle into steady postexercise rates more quickly as well.Both regular piano practice and general cardiovascular conditioning gained through quality aerobic exercise contribute to increased piano-playing endurance.Acute smoking increases cardiac outputs and heart rates of pianists resulting in higher levels of cardiac work during piano exercise.During piano exercise, acutely smoking pianists require greatly increased forearm blood flows to meet muscle needs.
8
Gamieldien, Kareemah. "The influence of maternal nicotine exposure on selected glycolytic and cytochrome P450 enzymes in developing neonatal rat lung". Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
Testo completoAbstract (sommario):
The structural and functional integrity of a developing and maturing fetal and neonatal lung is critically dependent on carbohydrate metabolism. The energy derived from carbohydrate metabolism is utilized during the processed of cell growth and development. It is reported that maternal nicotine exposure during pregnancy and lactation results in the irreversible inhibition of glycolysis, for which no mechanism is currently proposed and a significant increase in glucose turnover. The principal objective of this thesis was to determine the influence of maternal nicotine exposure during gestation and lactation on the isoenzyme patterns and transcript levels of the selected enzymes in developing neonatal rat lung, in an attempt to elucidate the mechanism of inhibition of glycolysis observed.
9
Hamadeh, Randar R. "The impact of smoking in Bahrain". Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670386.
Testo completo
10
Fu, Shing-yan Karen, e 符誠欣. "Cigarette smoke-induced inflammatory changes in rat heart in vivo". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48333864.
Testo completoAbstract (sommario):
Cigarette smoke (CS) is a well-established risk factor to cardiovascular health and the most preventable cause of death. Countless studies have demonstrated its harm to health and many more studies investigating its pathogenic mechanisms. While the CS-induced pathogenic mechanism of cardiovascular dysfunction has been mainly attributed to a combination of oxidative imbalance, vascular endothelial dysfunction, inflammation and modification of lipid profile, the focus of the current study was on the mediators of inflammation and the activation of signal pathways. In this study, we investigated the effects of CS on the pro-inflammatory/anti-inflammatory status in the heart and to elucidate the activation of specific signaling pathways in an in vivo rat model. Male Sprague-Dawley rats were divided into groups of CS exposure and sham air (SA) and exposed to 1 hour of respective CS and SA exposure daily for 56 days. The rats were then sacrificed and the ventricular homogenates were examined. Cardiac pro- inflammatory and anti-inflammatory mediators such as C-reactive protein (CRP), interleukin (IL)-6, cytokine-induced neutrophil chemoattractant (CINC-1), transforming growth factor (TGF)-β1, vascular endothelial growth factor (VEGF) and IL-10 were measured by enzyme-linked immunosorbent assay (ELISA) and the activation of specific signaling pathways was determined by Western blot analysis. CS caused suppression of cardiac CRP, IL-6, TGF-β1, and IL-10 and elevation of VEGF, revealing the imbalance of pro-inflammatory/anti-inflammatory status. Nuclear factor-κB (NF-κB) was also activated along with the activation of extracellular-regulated kinase (ERK) and c-Jun NH2-terminal kinase (JNK) but not p38 mitogen-activated protein kinase (MAPK) after 56 days of CS exposure. These data suggests the presence of a local adaptive mechanistic response to modulate cardiac pro-inflammatory/anti-inflammatory status via NF-κB/MAPK pathways after exposure to CS. These findings shed insight into the mechanistic pathways of CVD progression, allowing possible identification of selected mediators as biomarkers that could benefit early detection of CVD arisen from cigarette smoking.published_or_final_version
Pharmacology and Pharmacy
Master
Master of Medical Sciences
11
Bernard, Amy Lynn. "A descriptive analysis of selected smoking cessation programs". Virtual Press, 1991. http://liblink.bsu.edu/uhtbin/catkey/774763.
Testo completoAbstract (sommario):
The purpose of this research was to compare and contrast the components and characteristics of selected widely available smoking cessation programs.To reach this goal, an evaluation form was developed after an extensive review of the literature which addressed the structure, duration, techniques, issues which were discussed, success rates and availability of the programs. This form was tested for content validity by a jury of experts and was used to review each of thirteen selected smoking cessation programs. The reviews were conducted by the author using program materials received from the sponsoring organizations. Any questions which could not be answered with these materials were answered through a telephone interview with a representative of the sponsoring organization.Once the reviews were completed, the information was transferred to table form and to a database so that collective data could be generated. The following conclusions were drawn from the table and the data generated: the existing smoking cessation programs appear to have been developed utilizing suggestions offered in to use similar program techniques, and a great deal of variance exists in terms of success rates and cost.Department of Physiology and Health Science
12
Chung, Siu-fung, e 鍾少鳳. "A case control study on smoking, alcohol drinking and other risk factors of coronary heart disease in Hong Kong". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B29775334.
Testo completo
13
周詠珊 e Wing-shan Claudia Chow. "Maternal exposure to environmental tobacco smoke and birth weight: a retrospective cohort study". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31970989.
Testo completo
14
Shin, Vivian Yvonne, e 冼念慈. "A mechanistic study on the adverse effects of cigarette smoke extractson the delay of gastric ulcer healing". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B3122510X.
Testo completo
15
Chan, Hiu-wai Hilary, e 陳曉蔚. "Iowa gambling task in schizophrenia : an examination of the effect of tobacco-smoking in risk/reward decision making". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/192949.
Testo completoAbstract (sommario):
Background: Cognitive deficit is prominent in schizophrenia patients. We investigated the decision-making ability among schizophrenia patients and healthy controls based on their performance in the Iowa Gambling Task (IGT), a laboratory task developed for measuring individuals’ decision-making ability. We hypothesized that deficits in IGT performance in schizophrenia patients could be specifically ameliorated by smoking tobacco. In order to test this hypothesis, we compared smoking and non-smoking schizophrenia patients with healthy subjects, on their IGT performance.
Method: Ten smokers with schizophrenia, 9 non-smokers with schizophrenia, 16 non-psychiatric non-smokers and 7 non-psychiatric smokers were administered the computerized version of IGT. The Fagerstrom Test for Nicotine Dependence (FTND) was used to assess the degree of smoking dependence of subjects and to group the smokers and non-smokers.
Results: Subjects with schizophrenia performed significantly worse than non-psychiatric controls on IGT. Moreover, smokers with schizophrenia performed significantly better than non-smokers in the task. Furthermore, when comparing IGT performance of all the 4 groups, non-psychiatric non-smokers performed significantly better than psychiatric smokers in the IGT.
Conclusions: Similar to the results of previous research, schizophrenia patients performed worse than controls in the IGT, suggesting impairments in risk/ reward decision-making. Cigarette smoking may partially ameliorate schizophrenia patients’ performance deficits on neurological tasks, including the IGT. These findings on schizophrenia patients are clinically important since it is believed that the ability to make timely and correct decisions can result in good treatment compliance and coping strategies thus facilitates recovery. Last but not least, further research is needed to explain how smoking tobacco facilitates cognitive functioning in schizophrenia patients.published_or_final_version
Psychological Medicine
Master
Master of Psychological Medicine
16
Zhu, Changqi, e 朱昌淇. "Smoking, occupational exposures and lymphocyte DNA damage in Chinese workers". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242790.
Testo completo
17
Larson, Chandra S. "Perceptions of nicotine dependence and loss of autonomy among college student smokers". Virtual Press, 2003. http://liblink.bsu.edu/uhtbin/catkey/1286764.
Testo completoAbstract (sommario):
The purpose of the study was to determine the association of college student smokers' perceptions of nicotine dependence and measurements of loss of autonomy. The participants of the study were students enrolled in 7 randomly selected large (N > 170) core curriculum classes at Ball State University, during spring semester 2003. Using a cross-sectional data collection process, participants completed a 33 item survey consisting of questions from the Hooked on Nicotine Checklist and National College Health Risk Behavior Survey. The design of this study was to determine whether student smokers' perceive themselves as dependent on nicotine and how this was associated with a measurement on a loss of autonomy scale. Descriptive statistics, chi square, and univariate analyses were used to analyze the data. The majority, 64%, of participants had smoked sometime in their life, with 30% being classified as current smokers. Significant associations were found between the following variables: loss of autonomy and participants' perceptions of nicotine dependence, loss of autonomy and amount of cigarettes smoked, loss of autonomy and the number of years smoked, and perceptions of addiction and the number of years smoked. Gender and race were not found to be significantly associated with loss of autonomy or perception of nicotine dependence. Further analysis showed that as the consumption of cigarettes increases to an average of 2-5 cigarettes a day, chance of losing of autonomy also increases.Department of Physiology and Health Science
18
Richter, William Thompson. "Parameters of nicotine titration in addicted and non-addicted cigarette smokers". Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91144.
Testo completoAbstract (sommario):
Nicotine titration was studied in cigarette smokers not interested in cutting down or quitting smoking. Forty smokers were classified as high nicotine dependent (n=20) and low nicotine dependent (n=20) using a validated tolerance questionnaire. Subjects were randomized into baseline (n=10) or nicotine fade conditions (n=10) within their dependency group. Subjects in the baseline conditions smoked their preferred brand of cigarette throughout the experiment. Smokers in the fade conditions switched to a reduced nicotine brand in the latter half of the procedure.
Multiple in vivo and in vitro measures of smoking rate and topography were collected over a four day period. Based on analyses of these data, it was concluded that no compensatory changes in smoking behavior occurred that were clearly attributable to nicotine titration. It was found that smokers classified as high nicotine dependent smoked more intensively that low dependent smokers.
The implications of these findings given the design and experimental controls employed in this experiment are discussed, and directions for future research explored.M.S.
19
Coy, Kelly (Kelly Bishop). "A Comparison of Measures of Signal-To-Noise Ratio, Jitter, Shimmer, and Speaking Fundamental Frequency in Smoking and Nonsmoking Females". Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc500903/.
Testo completoAbstract (sommario):
Fifteen nonsmoking and fifteen smoking females 19 to 36 years of age were evaluated on measures of signal-to-noise ratio (SNR), jitter, shimmer, and speaking fundamental frequency (F0). The results indicated that: 1) there is a significant difference between female smokers and nonsmokers on measures of SNR, mean, and maximum F0 and, 2) there is no significant difference between female smokers and nonsmokers on measures of jitter, shimmer and minimum F0 . The SNR was found to be a powerful tool which is capable of distinguishing subtle vocal characteristics between the subject groups. It would appear that cigarette smoking may have an impact on the voice before distinct laryngeal pathologies are present.
20
廖兆霖 e Shiu-lam Edgar Liu. "Pathogenic mechanisms of cigarette smoking on ulcerative colitis-associated neoplasia in mice". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B3124452X.
Testo completo
21
Carcaise-Edinboro, Patricia. "The relationship of dietary beta-carotene intake and serum beta- carotene levels to the development of oral lesions in smokeless tobacco users". Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42097.
Testo completoAbstract (sommario):
This study was designed to assess the relationship of dietary and serum beta-carotene to the development of oral lesions in smokeless tobacco users. Eighty eight smokeless tobacco users without oral lesions and 18 with lesions participated in the study. Dietary intake of beta-carotene,
personal health habits and selected dietary intake were analyzed by questionnaire. Serum levels were assessed by high pressure liquid chromotography. No correlation between dietary beta-carotene intake and serum beta-carotene levels was observed. Results of t-test analysis indicated no significant difference in the mean serum or dietary intake of
beta-carotene between the groups. Mean serum beta-carotene for group-I, users without oral lesions and group-2, users with oral lesions were 12.3 ug/dl(I.02 SE), and 10.6 ug/dl(1.59 SE), respectively. Stepwise regression techniques were employed to assess the influence of selected variables on
serum beta-carotene. The effects of smoking, smokeless tobacco exposure, alcohol consumption, and age as well as other dietary indices were evaluated. Age (O.015,p
22
Oberholster, Leon Eduard. "The patterns of cigarette smoking and beliefs, attitudes and opinions about smoking among technikon students". Thesis, 2014. http://hdl.handle.net/10210/11037.
Testo completoAbstract (sommario):
M.Tech. (Environmental Health)Although evidence of the hazards of cigarette smoking has been in existence for many decades, millions of people around the world are still smoking, hundreds of thousands of teenagers take up smoking and the tobacco companies are allowed to continue promoting their products. To the annoyance of non-smokers, smoking is still allowed in many public places, such as restaurants and offices. This study serves, firstly, to provide an overview of the results of research on the dangers of smoking, nicotine addiction and passive smoking. Secondly, a self-completion questionnaire has been applied to a sample of students at eight technikons in South Africa. The questionnaire was designed to investigate the prevalence of smoking among the different population groups and genders to reveal some of the pattems of smoking of students, the factors influencing students' smoking status and to test students' beliefs, opinions and attitudes regarding smoking. The third objective of the study is to develop a theory on cigarette smoking and to propose anti-smoking measures at technikons. Researchers have produced conclusive proof that cigarette smoking is the cause of cancer, respiratory and heart disease and other diseases. Smoking maims and kills millions of people around the world annually and threatens the health of unborn babies and non-smokers, especially children. Tobacco companies apply the most sophisticated promotion techniques to persuade people to smoke and teenagers and certain other sectors' of the population are targeted by these activities. A study of nicotine addiction reveals that the need for this substance becomes as strong as any of man's basic physiological needs, such as those for food and water. This makes it very difficult, if not impossible, for many smokers to give up smoking. A multi-pronged strategy to combat smoking at education institutions is proposed, which includes health education and the banning of smoking on campuses.
23
Samuelsen, Andrew Ira. "Transformation of tobacco with the yeast FRE1 and FRE2 genes : characterization of transformants and discovery of a temperature-dependent morphological mutant". Thesis, 1996. http://hdl.handle.net/1957/34329.
Testo completoAbstract (sommario):
A key mechanism utilized by plants to make iron (Fe) available for
uptake is the reduction of Fe(III) to Fe(II) via an inducible, plasma
membrane-bound Fe(III) reductase. Genes encoding such enzymes have
not yet been isolated from plants; however, two Fe(III) reductases have
been cloned from yeast. FRE1 and FRE2 account for the total membrane-associated
Fe(III) reductase activity in Saccharomyces cerevisiae. If yeast
reductase genes could be expressed in a plant system, root Fe(III) reduction
may be enhanced, leading to a decrease in Fe chlorosis in transgenic plants.
FRE1 and FRE2 were introduced into tobacco via Agrobacterium-mediated
transformation. Fe(III) reductase activity was measured in
homozygous transformants containing FRE1, FRE2, or both. The highest
Fe(III) reduction levels were found in lines containing both FRE1 and FRE2.
Liquid reductase assays showed three to four times more Fe(III) reduction
in these transformants as compared to controls, and visual plate assays
showed reduction along the entire length of the roots. One FRE1 containing line initially exhibited chlorosis on medium with low Fe at pH 7.5, but later recovered. Other transformants and the control remained chlorotic.
Agrobacterium-mediated transformation often produces mutant phenotypes. A temperature-dependent morphological mutant was found among the progeny of tobacco transformed by Agrobacterium. The mutation is recessive and is expressed at low temperature (21��C). Mutant characteristics include formation of thick, narrow leaves with abnormal mesophyll cells and near absence of apical dominance. Also in the greenhouse (21-23��C), most plants remain vegetative, and the few flowers that are formed have petaloid stamens. High temperature (30��C) reverses the mutant phenotype, with formation of normal leaves and restoration of apical dominance. However, many flowers still have petaloid stamens. This mutant shares several phenotypic characteristics with transgenic tobacco plants overexpressing maize and Arabidopsis homeodomain proteins.Graduation date: 1997
24
Bayat, Mahomed. "Cigarette smoking among Indian matriculants at ex-House of Delegates schools in Northern Kwa-Zulu Natal". Thesis, 1995. http://hdl.handle.net/10413/6078.
Testo completoAbstract (sommario):
A descriptive study of cigarette smoking in a sample of Indian matriculation students was undertaken in Northern Kwa-Zulu Natal in order to establish the prevalence of cigarette smoking; reasons for developing cigarette smoking behaviour; to determine knowledge about and attitudes to cigarette smoking and also to establish students' awareness of antismoking
organisations and to make recommendations based on the findings.
Data was collected by the researcher who administered questionnaires at various schools previously under the jurisdiction of the House of Delegates, in the towns of Newcastle, Dannhauser, Glencoe and Dundee. There were 55 smokers in the sample (N =326), ie., a prevalence rate of 16,9%. Among the males 52 (36,1%) were smokers and 3 (1,8%) females smoked. Fifty four (98,2%) smokers had commenced smoking above the age of 10 years. Twenty seven (53%) smoked at home and 12 (24%) smoked at school.
Experimentation occured among 46 (83,6%) smokers prior to actual smoking with 52 (94,5%) smokers having friends who also smoked. Advertisements influenced 10 (18,2%) smokers while 11 (20%) were influenced by teachers and 9 (16,7%) were influenced by family members. Smokers received more pocket money than non-smokers. More family
members of the smokers were also smokers as opposed to non-smokers.
Fourty nine (89,1%) smokers believed that smoking was harmful to themselves while 41 (74,5%) said it was also harmful to others. The association between smoking and lung cancer was well known by 49 (90,7%) smokers but the association with heart disease and other cancers was not as well known. There was very little awareness among both smokers and non-smokers about anti-smoking programmes and organisations. Alarmingly there was hardly any formal health education
on the dangers of smoking in schools. The conclusions are that the prevalence of cigarette smoking among Indian matriculants in the study area was 16,9% and that teachers, friends, family members and advertisements are influential in cigarette smoking behaviour. There is a need for education on the dangers of smoking in schools; and parents and teachers must take congnisance about smoking at home and in schools.Theses (M.Fam.Med.)-University of Natal, Durban, 1995.
25
Egbe, Catherine Oritsebemigho. "Risk influences for smoking among the youth in Southern Nigeria". Thesis, 2013. http://hdl.handle.net/10413/9284.
Testo completoAbstract (sommario):
Introduction: Tobacco smoking continues to raise serious concerns for health promotion practitioners and health bodies globally. It has been tagged the single largest cause of all premature deaths globally. Efforts at discouraging tobacco use especially among the youth are not only aimed at reducing smoking prevalence in the short term but at disrupting the chain of supply for the tobacco marketers who see the youth population as their source of replacement smokers. Measures to curb smoking prevalence currently rely heavily on policy regulation but there is need to have a holistic approach towards finding out what influences the youth to smoke in order to have relevant context-specific interventions to further tobacco control efforts. This study is aimed at ascertaining the risk influences for smoking behaviour amongst the youth in Southern Nigeria with specific focus on cultural/environmental, interpersonal and intrapersonal factors serving to increase smoking initiation and perpetuation as guided by the Theory of Triadic Influence (TTI).
Method: Exploratory mixed methods research design was employed in carrying out this study. Qualitative interviews were conducted with 27 persons in 24 individual interviews (comprising of 18 young smokers aged 18 to 24 years, 4 political analysts and 2 community leaders) and 1 focus group discussion with 3 community leaders. A total of 550 youth aged between 18 and 24 years participated in the survey (quantitative) phase of this research. Non-probability sampling was used in recruiting participants for this study. Purposive sampling was used for the qualitative phase while multi-staged convenience sampling was used in the survey phase. Interpretative phenomenological analysis (IPA) with the aid of the software Nvivo 9 was used in analyzing the qualitative data while the software Statistical Package for the Social Sciences (SPSS) version 19 was used in the analysis of the quantitative data. Results: Qualitative and survey results show that there are an array of factors at various levels influencing the youth in southern Nigeria to view cigarettes as attractive and less harmful. At the cultural environmental level, there exist traditional practices in some parts of Southern Nigeria that make cigarettes easily accessible to the youth. Contact with cigarettes as a minor was found to be the best predictor of smoking among other cultural factors involving tobacco use while exposure to second hand smoke was the best predictor of smoking. With an absence of a functional national tobacco control law presently, cigarette is cheap, easily accessible to young people and tobacco manufacturers and marketers still promote their businesses in many ways which target the youth. At the interpersonal level, youth were influenced majorly by their peers to initiate smoking but indirectly by parents, older sibling and role models who smoke. At the intrapersonal level, youth were found to smoke for a variety of reasons ranging from wading off depression, coping with social stress and wanting to live up to the expectations of friends. Youth’s knowledge about the effect of smoking on health and well-being did not translate to a desire to quit smoking. Conclusion/recommendations: The Nigerian government needs to take urgent steps to address the tobacco question in the country through policy formulation and implementation. There is need to raise more awareness in the population on the dangers of smoking. Cessation clinics are also needed to help those who desire to quit smoking. Cultural activities involving the use of cigarettes and other tobacco products need to be properly addressed through the right channel to ensure this practice is stopped. A theoretical model explaining the risk influences for smoking among the youth is presented and suggestions are made with regards to a re-categorization of constructs in the theory of triadic influence which guided this study.Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2013.
26
Kamocki, Krzysztof. "The role of ceramides in cigarette smoke-induced alveolar cell death". Thesis, 2013. http://hdl.handle.net/1805/3311.
Testo completoAbstract (sommario):
Indiana University-Purdue University Indianapolis (IUPUI)The complex pathogenesis of emphysema involves disappearance of alveolar structures, in part attributed to alveolar cell apoptosis. The mechanism by which cigarette smoke (CS) induces alveolar cell apoptosis is not known. We hypothesized that ceramides are induced by CS via specific enzymatic pathways that can be manipulated to reduce lung cell apoptosis. CS increased ceramides in the whole lung and in cultured primary structural lung cells. Exposure to CS activated within minutes the acid sphingomyelinase, and within weeks the de novo- ceramide synthesis pathways. Pharmacological inhibition of acid sphingomyelinase significantly attenuated CS-induced apoptosis. To understand the mechanisms by which ceramides induce apoptosis, we investigated the cell types affected and the involvement of RTP801, a CS-induced pro-apoptotic and pro-inflammatory protein. Direct lung augmentation of ceramide caused apoptosis of both endothelial and epithelial type II cells. Ceramide upregulated RTP801 and the transgenic loss of RTP801 inhibited only epithelial, but not endothelial cell apoptosis induced by ceramide. In conclusion, CS induces acid sphingomyelinase-mediated ceramide upregulation and apoptosis in a cell-specific manner, which in epithelial cells involves induction of stress response proteins that may further amplify lung injury. Molecular targeting of amplification pathways may provide therapeutic opportunities to halt emphysema progression.
27
Booyse, Wilna. "Neuropsigologiese disfunksie by kinders met oormatige lugbesoedelingsblootstelling". Thesis, 2014. http://hdl.handle.net/10210/11211.
Testo completoAbstract (sommario):
M.A. (Psychology)The study of behavioural toxicology was started in 1972 with the Port Pirie Cohort study and therefor a relative young field. Little information is available about the effect of cigarette smoke, containing the toxic substance carbon monoxide, on the neurocognitive functioning of children. The purpose of this study was to determine whether carbon monoxide has an effect on the neurocognitive functioning of children, more specifically as it relates to school performance. A group of school children was selected in the Vaal Triangle area who were sUbjected to a large quantity of cigarette smoke during the day and a group of children was selected who had no contact with any cigarette smoke during the day. The results of these groups were compared. From the results obtained it appears that cigarette smoke, would have a negative neurocognitive functioning of the children.
28
"investigation on the effects and mechanisms of action of cigarette smoking on bone in female mice: 吸煙對雌性小鼠骨頭的作用和機制研究". 2014. http://library.cuhk.edu.hk/record=b6115668.
Testo completoAbstract (sommario):
吸煙是引起骨質疏鬆症的因素之一。臨床研究清楚表明吸煙者的骨密度降低，但其他干擾因素可能掩蓋了吸煙對骨頭的不良效果。使用動物模型用以研究吸煙和骨質疏鬆症之間是否有直接的因果關係與它潛在的機制是有必要的。為此，我們使用年輕和雌激素耗盡的小鼠作被動吸煙模型以及小鼠成骨細胞和破骨細胞株來作研究。年輕的Balb/c小鼠暴露於2%或4% (v/v)的香煙煙霧中，代表中度和重度吸煙的人。骨代謝生物標誌物明顯增加，4%吸煙組在14週後股骨的微觀結構4%顯著下降，這相等於人類吸煙12年。此外，雌性Balb/c小鼠進行4%吸煙和/或卵巢切除術(OVX)。吸煙+OVX組增加血清中骨轉換指標水平。4%吸煙組的股骨生長板較薄。μ-CT數據進一步表明，相對骨體積(BV / TV)和結構模型指數(SMI)在吸煙組有顯著影響，而且在吸煙+ OVX組上有更大程度的影響。
在細胞研究中使用氯仿(CSE)和乙醇的香煙提取物(ESE)。CSE抑制小鼠細胞株RAW 264.7形成破骨細胞，並刺激小鼠成骨細胞株的分化和功能。這個與體內研究矛盾的結果暗示直接從煙霧中提取的化學成分並不是引起骨質疏鬆的元兇。影響骨代謝的很可能是其他從煙霧中生成的活性代謝物和一些吸煙引起的內源性激素物質。在吸煙引起的骨質流失中，這些代謝物或內源性物質可能是非常重要的。
有見及此，4%吸煙小鼠的血清用以研究其對成骨細胞和破骨細胞活動的影響。吸煙小鼠血清顯著降低在成骨細胞中鹼性磷酸酶(ALP)活性和鈣沉積，一些成骨細胞標記基因和蛋白表達均下降，而且 Wnt/β-catenin信號通路下調。此外，吸煙小鼠血清顯著增加形成破骨細胞的數量，組織蛋白酶K的基因和蛋白表達增加，在NF-κB和p-38 MAPK信號傳導途徑的信號分子表達增加。
總而言之，大量吸煙可能影響年輕小鼠和雌激素耗竭小鼠的骨代謝和微結構，通過類似的行動機制，人類也可能有同樣的骨疾病風險。這項研究揭示了吸煙導致的骨質疏鬆症在青少年和絶經後婦女的發病機制。這也給我們線索如何預防和治療與吸煙有關的骨骼疾病。這項研究還傳達了一個明確的信息：在年輕時應開始應控制吸煙。
Cigarette smoking is one of the risk factors for osteoporosis. Clinical studies clearly showed that smokers have lower bone mineral density, but other confounding factors could mask the adverse actions of smoking on bones. Animal models are warranted to study the direct causal relationship between cigarette smoking and osteoporosis, and also the underlying mechanisms. In this regard, we used a mouse passive smoking model in both young and estrogen depleted mice, and the mouse osteoblast and osteoclast cell lines.
Young Balb/c mice were exposed to 2 or 4% (v/v) of cigarette smoke, similar to moderate or heavy smoking respectively in humans. Biomarkers for bone turnover were increased and bone microstructure of femur was significantly deteriorated after 4% smoking for 14 weeks which is similar to cigarette smoking for 12 years in humans. Furthermore, the effects of heavy smoking on ovariectomized mice were also investigated. Female Balb/c mice were subjected to 4% cigarette smoking and/or ovariectomy (OVX). Cigarette smoking together with OVX further increased the levels of bone turnover markers in serum. Femur growth plate was thinner in the 4% smoking group when compared to those in the SHAM- and OVX-operated groups. Micro-CT data further indicated that the relative bone volume (BV/TV) and structural model index (SMI) were significantly affected in the smoking groups, and to a greater extent in the 4% smoking + OVX group.
Chloroform (CSE) and ethanol smoke extracts (ESE) were used in cell studies. CSE suppressed the formation of osteoclasts, and stimulated the differentiation and function of mouse osteoblasts. These findings are contradictory to those found in in vivo study implying that chemical components directly extracted from cigarette smoke are not the culprits in causing bone disorder in animals. It is likely that other active metabolites from cigarette smoke and some endogenous hormonal substances released by cigarette smoking could affect bone metabolism. These active metabolites together with the endogenous bone hormones are perhaps crucial in smoking-induced bone loss in the body.
In view of this hypothesis, sera from 4% smoking mice were used to investigate their effects on osteoblast and osteoclast activities. It was found that the alkaline phosphatase (ALP) activity and calcium deposition in osteoblast were reduced significantly by the sera from smoking mice. Gene and protein expressions of some osteoblast markers were also decreased. The downregulation of Wnt/β-catenin signaling pathway was observed after the treatment with the serum obtained from the 4% smoking group. Moreover, the number of osteoclasts being formed was increased significantly by the smoking mouse serum. Cathepsin K gene and protein expressions were also induced. The increased expressions of the signaling molecules including NF-κB and p-38 MAPK were also observed.
In conclusion, heavy cigarette smoking could deteriorate bone metabolism and microstructures in young female and also estrogen depleted mice. The same kind of risk in bone disease may also apply to humans through similar mechanisms of action. This study sheds light in understanding the pathogenesis of smoking-induced bone disorders in teenagers and also postmenopausal women. It also gives us clues how to prevent and treat smoking related bone diseases. This study also conveys a clear message that cigarette smoking control should be started in young ages.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Chan, Lok Yi Ruby.
Thesis (Ph.D.) Chinese University of Hong Kong, 2014.
Includes bibliographical references (leaves 182-207).
Abstracts also in Chinese.
Chan, Lok Yi Ruby.
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Kamanzi, Desire G. "Knowledge and practices of smoking among students of the University of Natal on Durban campus residences". Thesis, 2001. http://hdl.handle.net/10413/5415.
Testo completoAbstract (sommario):
The Health Belief Model developed by Becker ( 1984) cited in Katzenellenbogen et al. ( 1999) guided this study. The model attempts to identify beliefs and the way they may interact to influence individuals' conscious decisions to undertake certain healthrelated actions. "The most important health beliefs that influence actions are thought to be: • The person's perceived vulnerability to a particular condition or illness, • The person' s perceptions of the severity or effects of the condition or illness, • The Person's perception of the efficacy, costs, and benefits of any proposed actions" (Katzenellenbogen, joubert & Karim, 1999: 169). The three points mentioned above guided systematically the whole study as follows: 1. The students' perceived vulnerability to a particular cond ition or illness in this case guided the researcher to describe and to understand students' personal perceptions of the risk of diseases they run by smoking or that they can cause to other people in their surroundings. It was also necessary to find out whether or not non-smokers were aware of the consequences in terms of diseases of being permanently exposed to tobacco smoke. 2. Once smokers as well as non-smokers have agreed that smoking increases the risk of diseases, the following step was to ensure whether or not they continue to neglect and run the same risk. because smoking consequences occur only after a long period of time. 3. The last step was to ensure that students who smoked could actually accept and put into practices some available strategies for giving up smoking. after being sensitised or on their own initiative, in order to remain in good health.Thesis (M.Cur.)-University of Natal, Durban, 2001.
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Thendele, Mervis. "Factors contributing to cigarette smoking and its health effects amongst university students South Africa". Diss., 2017. http://hdl.handle.net/11602/1081.
Testo completoAbstract (sommario):
MPHDepartment of Public Health
Background: Globally, cigarette smoking is causing preventable deaths in developing countries affecting especially the youth. Historically, cigarette smoking is known to be more common among adults but is also becoming common among students. Purpose: The study aimed to investigate factors contributing to cigarette smoking and its health consequences amongst students of the University of Venda in South Africa. Methodology: A quantitative approach using a descriptive cross- sectional design was adopted. Convenience sampling was used to randomly select 428 respondents. A self-reporting questionnaire with closed ended questions was administered to respondents between the ages of 17-40 years who suited the inclusion criteria. Permission to conduct the research was obtained from the Ethics Committee of the University of Venda. Data were analysed using SPSS version 23 and presented in the form of tables and charts. Pearson’s chi squares were used to test significant relationships between variables and smoking status. Results: A total of 407 students participated in the study. Of the 407, 208 (51%) of respondents were female students. The mean age of the study population was 24 years. Of these 407, 175(43%) reported being smokers 232 (57%) were nonsmokers. More smokers were observed among the male respondents and registered for first and second years. There was a significant relationship between age, gender, religion, school of affiliation, amount of pocket money and smoking status (P-value=0.05).The results showed that the majority of the respondents285 (70%) agreed to the belief that students smoked cigarettes due to availability of cigarettes at every corner of the campus, 281 (79%) peer influenced by friends 289 (71%) family members who smoke, and 313 (76.8%)increase social interaction. The majority of the students were knowledgeable about health consequences caused by smoking. Nonsmoking students were more knowledgeable about harmful effects of smoking as compared to smokers (P=0.00. Conclusion: The study concludes that students smokes cigarettes due to being a friend with someone who smokes, being in new a environment, stress, depression, observation of other students smoking, no signage prohibiting smoking and lack of knowledge regarding health
NRF
31
Albrecht, Daniel Strakis. "Assessment of the dopamine system in addiction using positron emission tomography". Thesis, 2014. http://hdl.handle.net/1805/5192.
Testo completoAbstract (sommario):
Indiana University-Purdue University Indianapolis (IUPUI)Drug addiction is a behavioral disorder characterized by impulsive behavior and continued intake of drug in the face of adverse consequences. Millions of people suffer the financial and social consequences of addiction, and yet many of the current therapies for addiction treatment have limited efficacy. Therefore, there is a critical need to characterize the neurobiological substrates of addiction in order to formulate better treatment options. In the first chapter, the striatal dopamine system is interrogated with [11C]raclopride PET to assess differences between chronic cannabis users and healthy controls. The results of this chapter indicate that chronic cannabis use is not associated with a reduction in striatal D2/D3 receptor availability, unlike many other drugs of abuse. Additionally, recent cannabis consumption in chronic users was negatively correlated with D2/D3 receptor availability. Chapter 2 describes a retrospective analysis in which striatal D2/D3 receptor availability is compared between three groups of alcohol-drinking and tobacco-smoking subjects: nontreatment-seeking alcoholic smokers, social-drinking smokers, and social-drinking non-smokers. Results showed that smokers had reduced D2/D3 receptor availability throughout the striatum, independent of drinking status. The results of the first two chapters suggest that some combustion product of marijuana and tobacco smoke may have an effect on striatal dopamine concentration. Furthermore, they serve to highlight the effectiveness of using baseline PET imaging to characterize dopamine dysfunction in addictions. The final chapter explores the use of [18F]fallypride PET in a proof-of-concept study to determine whether changes in cortical dopamine can be detected during a response inhibition task. We were able to detect several cortical regions of significant dopamine changes in response to the task, and the amount of change in three regions was significantly associated with task performance. Overall, the results of Chapter 3 validate the use of [18F]fallypride PET to detect cortical dopamine changes during a impulse control task. In summary, the results reported in the current document demonstrate the effectiveness of PET imaging as a tool for probing resting and activated dopamine systems in addiction. Future studies will expand on these results, and incorporate additional methods to further elucidate the neurobiology of addiction.