health effects of low level

... fears of telling the truth of their speaking shortcomings and the reasons behind that Another potential issue was the English translation of the interviews As all of the students were low- level ... researcher followed Bygate and Porter’s (1991) procedures of observing changes in students’ fluency, in which the ratios of the amount of pauses and the amount of self-repair to number of words were ... number of professionals in the research world have also made use of task familiarity, for various purposes and in various contexts One of the pioneers who set the earliest ground for repetition of

Ngày tải lên: 17/01/2020, 07:05

... IN RESOLVING GULF WAR AND HEALTH ISSUES Investigations of the health effects of past wars have often focused on narrowly defined hazards or health outcomes, such as infectious ... use of such weapons in the gulf could result in the deaths of tens of thousands of Americans Therefore, in addition to the standard vaccinations before... Many of the ... Health: A Review of the Medical Literature Relative to Gulf War Veterans’ Health) to review that body of literature and to summarize what is known about the current status of

Ngày tải lên: 16/02/2014, 01:20

... of enchondral ossification, earlier differentiat ion of mesenchymal cells, increase of preosteogenic cells [23], and stimulation of callus formation [21,22] are some of the positive effects of ... A total of 234 Table 5 Study Characteristics of Selected Experimental Controlled Animal Studies on He-Ne Low Level Laser Irradiation Effects on Bone Healing Authors Surgery Type Type of Fixation ... of fixed versus a random effects method of analysis [32]. Both random and fixed effects models are used to determine the statistical differences of the combined results; however, the random effects

Ngày tải lên: 20/06/2014, 04:20

... many of these chemicals, particularly over long periods of time at low exposure levels, is largely unknown. One of the most widely known episodes related to disposal of hazardous wastes is that of ... Causes of Death in the U.S. between 1950 and 2000 Rank Year 1950 1980 2000 Cause of death % a Cause of death % a Cause of death % a 1 Disease of heart 40.5 Disease of heart b 39.6 Disease of heart ... Furthermore, consumption of crude oil has also increased, with the average rate of increase of 6% per year in the past decades. Part of this increase is the result of the growing use of motor vehicles,

Ngày tải lên: 11/08/2014, 13:22

... relatively low concentrations of toxicants. Signs and symptoms vary depending on the types of toxicants, their concentrations, and species of exposed organisms. 3.7.2 A CUTE EFFECTS A number of acute ... resulting from exposure to high levels of airborne or waterborne pollutants. Exposure to high levels of air pollutants results in various physiological changes, leading to health problems. Air pollutants, ... composed of the gaseous products of burning carbonaceous materials made visible by the presence of small particles of carbon. The brownish to blackish materials emitted from the stack of an inadequately

Ngày tải lên: 11/08/2014, 13:22

... by uptake of sublet hal amounts of toxicants over a long period. Chronic injury is manifested by yellowing of leaves that may progress slowly through stages of bleaching until most of the chlorophyll ... plants, an acute injury occurs following absorption of sufficient amounts of toxic gas or other forms of toxicants to cause destruction of tissues. The destruction is often manifested by collapsed ... long period of time, even permanently. Excretion of the toxicant following temporary storage may also occur. 4.3.5 M ETABOLISM The metabolism of toxicants may occur at the portals of entry, or

Ngày tải lên: 11/08/2014, 13:22

... deposition of excessive amounts of collagen such that the features of the hepatic lobules are accented. Hepatic fibrosis can result from repeated exposure or continuous injury following prolonged low- level ... physical, not chemical. The area of the filtering surface of glomeruli of a single kidney is as large as the surface of the entire body, and the glomerular capillaries of both kidneys would stretch ... and is mostly water. Out of some 200 l of filtrate a day, an average adult concentrates about 1.5 l of urine. It is obviously essential that most of the filtrate and many of its dissolved materials

Ngày tải lên: 11/08/2014, 13:22

... rates and tidal volumes, and slowing of mucus clearance in humans. 15 The effect of SO 2 on human health varies markedly with the health status and physical activit y of individuals. For example, ... turgidity of stomatal guard cells. Low concentrations of SO 2 can injure epidermal and guard cells, resulting in elevated stomatal con- ductance and greater entry of SO 2 into plants. Following ... produced thickening of the basement membranes, resulting in narrowing and fibrosis of the bronchioles. Emphysema-like alterations of the lungs developed, followed by death of the animals. 24 As

Ngày tải lên: 11/08/2014, 13:22

... of starvation. 12.2.3.3 Health Effects of Lead in Humans In humans, about 20 to 50% of inhaled, and 5 to 15% of ingested inorganic Pb is absorbed. In contrast, about 80% of inhaled organic Pb is ... changes. Of greatest current concern is the impairment of cognitive and behavioral development in infants and young children. Because of this, CDC lowered the definition of elevated blood Pb level ... significant amounts of Pb derived from these sources. Water is the second largest source of Pb for children (Pb in paint being the largest). In 1992, the levels of Pb in 130 of the 660 largest

Ngày tải lên: 11/08/2014, 13:22

... Mechanisms of Action of Several Mutagenic Agents Chemical action Mechanism of action Alkylation Addition of an alkyl group (CH 3 CH 2 CH 2 –, etc.) to a nucleotide Arylation Covalent bonding of an ... cytotoxic effects of a variety of metallic salts, which result in the denaturation of macromolecules. The reactions of metallic ions with nucleic acids are particularly important as some of the metals ... occur through the action of physical or chemical agents found in the environment. Occurrence of mutation, however, depends on the nature of the initial lesion and the response of cells to the DNA

Ngày tải lên: 11/08/2014, 13:22

... any of a group of diseases characterized by uncontrolled growth and spread of abnormal cells. In the scientific or medical community, the term malignant neoplasm (tumor) is often used in place of ... be 556,500 in 2003. 2 One of the most common characteristics of the development of a neoplasm in an organism is the long period of time between the initial application of a carcinogenic (cancer-causing) ... is the primary cause of the failure of treatment in cancer patients. The extent of the dissemination of the malignant cells is determined by the physiological condition of the host. During metastasis,

Ngày tải lên: 11/08/2014, 13:22

... indicated Cell density of the biofilms was calculated from the CFU data Figure Effects of ampicillin on biofilms of B subtilis 1500 Biofilms were treated with varying concentrations of ampicillin and ... liquid level is about cm below the top of the cuvette when full (3 mL) Figure Effects of DC and pre-treated media on planktonic cells of B subtilis 168 Planktonic cells were sub-cultured to OD600 of ... fold) Effects of DC treatments on biofilms To determine the effect of DCs on biofilms, B subtilis biofilms were developed on 304L stainless steel electrodes and treated with the same total DC levels...

Ngày tải lên: 20/06/2014, 23:20

... lack of knowledge about the timing of air pollution effects (e.g critical ages, duration of exposure and persistence of effects) will add uncertainty to the impact assessment of chronic effects ... costing the health impacts of ambient particulate air pollution in the UK Edinburgh, December 2000 DEPARTMENT OF HEALTH AD-HOC GROUP ON THE ECONOMIC APPRAISAL OF THE HEALTH EFFECTS OF AIR POLLUTION: ... choice of health outcomes for use in health impact assessments, and on how epidemiologic estimates of the effects of air pollution should be used in such assessments (Sections 4.1–4.3, below) The...

Ngày tải lên: 17/02/2014, 11:20

... orders of magnitude) specic emissions of hydrocarbons and high levels of PM, 24 Health effects of transport-related air pollution consisting mainly of VOCs, with only a small fraction of solid ... understanding of the role of exposure to various pollutants in producing adverse effects on health and of the determinants of this exposure may improve the effectiveness of further action An example of ... however, to allow a more precise evaluation of the effects of and changes in exposure More research is needed on the patterns and adverse health effects of population exposure and on the role of the...

Ngày tải lên: 17/02/2014, 11:20

... Epidemiology of the Unusual Smog Episode of October 1948 Public Health Service: Washington, DC, 1949 U.K Ministry of Health The Report of the Chief Medical Of cer on the State of Public Health Her ... Studies of Air Pollution and Health; Am J Epidemiol 2002, 156, 193-203 120 Health Effects Institute Revised Analyses of Time-Series of Air Pollution and Health Special Report; Health Effects ... Analysis of Various Models of ShortTerm Effects of Ambient Particles on Total Mortality in 29 Cities in APHEA2 In Revised Analyses of Time-Series of Air Pollution and Health Special Report; Health Effects...

Ngày tải lên: 17/02/2014, 11:20

... mg/m3/Numbers of Admissions 300 250 200 150 100 50 mg/m3/Numbers of Admissions Fall and Winter Months, Utah Valley 250 Total Mean High PM10 levels for Months Included 200 150 Mean PM10 100 levels for ... admissions concentrations Sources: Pope Am J Pub Health. 1989; Pope Arch Environ Health 1991 Sources: Pope Am J Pub Health. 1989; Pope Arch Environ Health 1991 Mill Closed This presentation not organized ... Controlled experimental human and animal Panel studies of asthmatics and non-asthmatics Summary of early Utah Valley epidemiological studies Health effects • Increased hospital admissions • Increased...

Ngày tải lên: 17/02/2014, 11:20

... conversion of the POR complex, is irreversible There is no evidence of the reformation of organized PLB if the pH of the low pH sample is returned to pH 7.5 by the addition of small amounts of KOH ... results of measurements of the effects of ATP, ADP, AMP and adenosine on the corresponding low pH-induced blue-shift in the absorption maximum of maize PLB, made in the presence and absence of NaF, ... rate of the blue shift in the presence or absence of NaF alone The NADPH-binding efficiency of POR-Chlide684, at low pH is unknown It is thus hard to disentangle the effects of a possible loss of...

Ngày tải lên: 22/02/2014, 04:20

... assessment of the respiratory health effects associated with passive smoking has been prepared by the Human Health Assessment Group, Office of Health and Environmental Assessment, Office of Research ... the Office of Health and Environmental Assessment (OHEA) within the Office of Research and Development, with major contract funding provided by the Indoor Air Division within the Office of Air ... epidemiologic studies of effects of passive smoking on asthma in childhood 7-45 x TABLES (continued) 7-8 Epidemiologic studies of effects of passive...

Ngày tải lên: 15/03/2014, 01:20

... wireless systems will be of value in determining if there are any health effects resulting from exposures to low levels and/or intermittent sources of RF radiation NonCancer Health Effects Few studies ... mechanisms of low- intensity RF electromagnetic fields that could have health consequences Of particular interest is the possible existence of health effects that occur due to the accumulation of multiple, ... demodulation effects There is some research with respect to this question underway Judged to Be of Lower Priority It is unclear whether low- level RF exposure can trigger effects through stimulation of...

Ngày tải lên: 15/03/2014, 15:20

... Analysis of Various Models of Short-Term Effects of Ambient Particles on Total Mortality in 29 Cities in APHEA2; In Revised Analyses of Time-Series Studies of Air Pollution and Health; Health Effects ... to mind the oft-used analogy of “under the lamp post” in that PM effects are somehow determined by the mass-dose of PM There is some discussion of size-based determinants of health effects, but ... Analyses of Time-Series of Air Pollution and Health Special Report; Health Effects Institute: Boston, MA, 2003; pp 91-96 Chow, J.C Introduction to the A&WMA 2006 Critical Review— Health Effects of...

Ngày tải lên: 15/03/2014, 20:20