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Results 551 - 600 of 1603
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Suwansaksri J - - 2001
Lead is an important heavy metal used in many industrial processes. It plays an important role in the pathogenesis of both acute and chronic toxicity. Mechanics have a high risk of benzene exposure but tend to be a forgotten occupational group in Thailand. In this study, monitoring of lead exposure ...
Srivastava S - - 2001
As part of our program to investigate the possible role of environmental pollutants in the incidence of intrauterine-growth retardation (IUGR) in India, we determined the lead and zinc levels in mothers and neonatal blood, collected at parturition, in cases with normal and IUGR babies. Both maternal and cord blood lead ...
Orloff K G - - 2001
The Agency for Toxic Substances and Disease Registry (ATSDR) conducted biological testing to assess dioxin exposure in residents of a community who lived in an area with heavy chemical industry. Dioxin concentrations were measured in blood serum samples from 28 adult residents of the community. Fourteen of those tested had ...
Accurso V - - 2001
BACKGROUND: Most subjects with blood/injury phobia experience syncope or presyncope as part of the phobic response. We tested the hypothesis that these subjects have a constitutional autonomic dysregulation that predisposes them to vasovagal syncope during head-up tilt. METHODS AND RESULTS: We studied 11 subjects (9 females, 2 males) who had ...
Birch J M - - 2001
The flow structure that is largely responsible for the good performance of insect wings has recently been identified as a leading-edge vortex. But because such vortices become detached from a wing in two-dimensional flow, an unknown mechanism must keep them attached to (three-dimensional) flapping wings. The current explanation, analogous to ...
Monteiro L R - - 2001
Methylmercury (MHg) kinetics, dose-response, excretion, and toxicity were experimentally evaluated and compared between small (one to two weeks old) and large (six to seven weeks old), free-living Cory's shearwater chicks. The half-time for the terminal elimination phase of MHg in blood (5.7 d) and the average percentage of ingested MHg ...
Todd A C - - 2001
BACKGROUND: The aims of this study were to examine some of the factors that influence tibia lead concentrations, tibia lead x-ray fluorescence measurement uncertainty and blood lead concentrations, and to compare tibia lead concentrations in Taiwanese lead workers to those observed in lead workers from other countries. METHODS: A pilot ...
Duydu Y - - 2001
Inorganic lead exposure was studied in 31 volunteers employed in storage battery plant. The genotoxicity of lead was measured in terms of sister chromatid exchange (SCE). Erythrocyte delta-aminolevulinic acid dehydrogenase (ALAD) activity, urinary delta-aminolevulinic acid (U-ALA), and blood lead levels (PbBs) were also determined to evaluate some possible relations between ...
Kitamura K - - 2001
Measurement of blood dioxin levels to monitor human exposure is tedious and expensive work, although high-resolution mass spectrometers equipped with high-resolution gas chromatography are becoming relatively common in Japan. The Ministry of Health and Welfare and the Environmental Agency require measurement of 17 dioxins, seven PCDDs and 10 PCDFs, according ...
Beck B D - - 2001
This presentation describes the development of a prototype Monte Carlo module for the physiologically-based pharmacokinetic (PBPK) model for lead, created by Dr Ellen O'Flaherty. The module uses distributions for the following: exposure parameters (soil and dust concentrations, daily soil and ingestion rate, water lead concentration, water ingestion rate, air lead ...
Mortada W I - - 2001
BACKGROUND: Traffic policemen are the most exposed population to lead (Pb) from automobile exhaust. There has been increasing concern about the possible harmful effects of Pb from automobile exhaust on health of traffic policemen. However, no such study was concerned with the impact of Pb exposure on renal function among ...
Bulleova S - - 2001
Although blood bank blood is usually screened for dangerous pathogens, the presence of toxic metals in blood has received little attention. Population blood lead levels have been declining in the United States, but occasional high outliers in blood lead concentration can be found--even when mean levels of blood lead are ...
Béliveau M - - 2001
The objective of the present study was to determine the rat blood:air partition coefficients (P(b:a)) of chloroform, bromodichloromethane, dibromochloromethane and bromoform present in vitro individually or as mixtures. The experimentally determined P(b:a) of chloroform, bromodichloromethane, dibromochloromethane and bromoform present individually corresponded to (mean +/- SD, n = 8) 21.3 +/- ...
Iregren A - - 2001
OBJECTIVE: To investigate possible neurotoxic effects in groups of aluminium pot room and foundry workers, aluminium welders, and a small group of workers exposed to aluminium in the production of flake powder. METHODS: Exposure to aluminium was evaluated with aluminium concentrations in blood and urine as well as a questionnaire. ...
Chen C - - 2001
Tofu is a commonly consumed food in China. Tofu may interfere with lead absorption and retention because of its high calcium content. In this observational study, the authors examined whether dietary tofu intake was associated with blood lead levels among young adults in Shenyang, China. The analyses included 605 men ...
Mira E - - 2001
A short profile of betahistine and its activity in treatment of Menière's disease and other forms of peripheral vertigo is presented. The clinical efficacy of betahistine is documented by a series of more than twenty controlled clinical studies, performed in the years 1966-2000. Basic researches initially proved that bethaistine acts ...
Pamphlett R - - 2001
Toxic and essential metals have been implicated in the pathogenesis of sporadic motor neuron disease (SMND), but attempts to measure blood levels of these metals have led to contradictory results. We, therefore, measured blood levels of various metals using paired SMND/controls. In 20 subjects with SMND (15 males, five females, ...
Mead P E - - 2001
Hematopoietic stem cells are derived from ventral mesoderm during vertebrate development. Gene targeting experiments in the mouse have demonstrated key roles for the basic helix-loop-helix transcription factor SCL and the GATA-binding protein GATA-1 in hematopoiesis. When overexpressed in Xenopus animal cap explants, SCL and GATA-1 are each capable of specifying ...
Hadjiconstantinou M - - 2001
Evidence indicates that the actions of nerve growth factor (NGF) reach beyond the nervous system and might modulate immune function. Based on reports that blood NGF rises following the acute stress of parachute jumping, we investigated whether exposure to a chronic stressor, caregiving for a cognitively impaired spouse, could alter ...
Wenker M A - - 2001
The aim of the present study was to assess the interindividual variation in styrene toxicokinetics and to correlate this variation with the individual metabolic capacity for cytochrome P450 (CYP), CYP2E1, CYP1A2 and CYP2D6. Twenty male volunteers were exposed on separate occasions to 104+/-3 and 360+/-20 mg/m3 of styrene for 1 ...
Bray R C - - 2001
Failed meniscal healing may lead to degenerative osteoarthritis of the knee. Healing is thought to be dependent upon an adequate blood supply, yet "normal" vascular changes during healing are not well understood. In this study we have quantified vasoactive and angiogenic responses to medial meniscal injury in a rabbit model ...
Rosenman K D - - 2001
The usefulness of a statewide laboratory-based blood lead surveillance system to initiate workplace enforcement inspections was studied. In particular, the effectiveness of inspection of companies in which at least one worker had a blood lead level (BLL) 30-39 microg/dL but no greater than 39 microg/dL was considered. The surveillance system ...
Kaufman A S - - 2001
This paper addresses the points raised by five groups of scientists who were invited to respond to my article on the relationship of low blood lead to IQ loss. I dealt with these comments as a scientist who believes that the case is not closed on this topic, as some ...
Cominos X - - 2001
A fast and efficient procedure has been developed for the analysis of total mercury in human tissues and blood using a hydride vapor generator system coupled to an atomic absorption spectrometer (HVG-AA). Tissue and blood samples were digested in a pressurized microwave decomposition system and the digest diluted prior to ...
Woodbury B L - - 2001
This paper compares the operation of a traditional single-stage system with a two-stage, reversible flow biodenitrification system for removing nitrates from drinking water. The purpose of this study was to investigate the ability of these two-stage systems to remove nitrate and residual organics from treated water as compared to single-stage ...
Dwivedi S K - - 2001
Varying degrees of lead (Pb) poisoning was recorded in cows and buffaloes near a primary lead-zinc smelter in India. Affected animals had history of clinical signs characterized by head pressing, violent movement, blindness and salivation. These animals revealed considerably high lead levels in blood (1.43 +/- 0.07 ppm) and milk ...
Toribara T Y - - 2001
Utilizing information obtained from the X-ray fluorescence linear scanning along a single strand of hair in a recent fatal exposure to dimethylmercury, it was possible to determine the circumstances leading to the fatal result. When the Dartmouth chemistry professor displayed symptoms of mercury toxicity, samples of her urine and blood ...
Hirano T - - 2001
We analyze the second Fourier coefficient v(2) of the pion azimuthal distribution in noncentral heavy-ion collisions in a relativistic hydrodynamic model. The exact treatment of the decay kinematics of resonances leads to almost vanishing azimuthal anisotropy of pions near the midrapidity, while the matter elliptic flow is in plane at ...
Lalor G - - 2001
Blood lead levels are reported for a total of 421 schoolchildren in 13 schools in rural and urban environments in Jamaica, including one highly contaminated community. In the rural areas blood lead levels ranged from 3 to 28.5 microg dl(-1), with a median of 9.2 microg dl(-1); the range and ...
Henderson R F - - 2001
The carcinogenicity of 1,3-butadiene (BD) varies greatly in the rodent species in which 2-year bioassay studies were completed. This raises the question of whether the risk of BD exposure in humans is more like that of the sensitive species, the mouse, or more like that of the resistant species, the ...
Lim Y C - - 2001
INTRODUCTION: We studied the relationship between renal dysfunction and occupational lead exposure in a local factory. MATERIALS AND METHODS: A cross-sectional study with a cohort component was conducted with 55 male workers of a factory producing PVC stabilisers as subjects. Workers from this factory have been followed up with 6-monthly ...
Gulson B L - - 2001
We conducted a case-control study to determine the contribution of lead to blood from consumption of calcium supplements approximating the recommended daily intakes over a 6-month period. Subjects were males and females ages 21 to 47 years (geometric mean 32 years) with a geometric mean blood lead concentration of 2.5 ...
Vaglenov A - - 2001
To investigate whether occupational exposure to lead is genotoxic, we evaluated data from 103 lead-exposed workers and 78 matched controls. These data correspond to three different sampling periods, and we measured genetic damage as increases in the frequency of binucleated cells with micronuclei (BNMN) in peripheral blood lymphocytes. The levels ...
Schwartz B S - - 2001
The authors performed a cross-sectional study to evaluate associations between blood lead, tibia lead, and dimercaptosuccinic acid (DMSA)-chelatable lead and measures of neurobehavioral and peripheral nervous system function among 803 lead-exposed workers and 135 unexposed controls in South Korea. The workers and controls were enrolled in the study between October ...
Kosatsky T - - 2001
The authors evaluated lead exposure of Canadians (Montreal) who fished the nearby St. Lawrence River. From screening interviews conducted with 1,118 fishers on-site during the winter and fall of 1996, the authors selected 60 Montrealers who consumed at least one sportfish meal per week and 72 who consumed less than ...
Strauss W J - - 2001
A model for children's blood lead concentrations as a function of environmental lead exposures was developed by combining two nationally representative sources of data that characterize the marginal distributions of blood lead and environmental lead with a third regional dataset that contains joint measures of blood lead and environmental lead. ...
Lee C W - - 2001
Methyl tertiary-butyl ether (MTBE) is an oxygenated compound added to gasoline to improve air quality as part of the US Federal Clean Air Act. Due to the increasing and widespread use of MTBE and suspected health effects, a controlled, short-term MTBE inhalation exposure kinetics study was conducted using breath and ...
Tomboulides A G - - 2001
We consider a convection process in thin loops of different geometries. At Ra=Ra(')(cr) a first transition leading to the generation of corner vortices is observed. At higher Ra (Ra>Ra(cr)) a coherent large-scale flow, which persists for a very long time, sets up. The mean velocity nu mass flux m, and ...
Leung T Y - - 2001
We aimed to investigate the association between whole blood mercury concentrations and semen quality in sub-fertile men. Fifty-nine male partners of infertile couples attending the Assisted Reproduction Unit of the Chinese University of Hong Kong between 1997 and 1998 were recruited into our study. Blood was taken from each subject ...
Finn C A - - 2001
Hydrothermally altered rocks can weaken volcanoes, increasing the potential for catastrophic sector collapses that can lead to destructive debris flows. Evaluating the hazards associated with such alteration is difficult because alteration has been mapped on few active volcanoes and the distribution and severity of subsurface alteration is largely unknown on ...
Furman A - - 2001
Current mean lead concentrations in umbilical cords and in maternal blood in Istanbul were 1.69 +/- 0.91 (standard deviation) microg/dl and 2.37 +/- 0.89 microg/dl, respectively. These levels were much lower than values reported in previous years. Umbilical cord blood lead levels, which correlated significantly with mothers' blood lead levels, ...
Haywood L - - 2001
The vasculature of the normal and arthritic knee is described. The joint contains a number of different tissues, many of which are heterogeneous and each with varying degrees of vascularization. In the normal joint the vasculature is highly organised, some tissues are highly vascular with well defined vascular organisation, whilst ...
Culpitt S V - - 2001
Neutrophils are manufactured in the bone marrow from stem cell precursors (myeloblasts) by a series of cell divisions. In healthy individuals only the mature neutrophils enter peripheral blood. They are the most numerous leukocyte subgroup, constituting half of the circulating white cell population. Healthy blood donors typically yield 1 million ...
Wasowicz W - - 2001
The aim of the study was to determine blood concentration of essential trace elements (Se, Zn, Cu) and toxic metals (Pb, Cd), markers of antioxidant (activities of glutathione peroxidase (GPx), superoxidase dismutase and ceruloplasmin) and prooxidant processes (thiobarbituric acid reactive substances (TBARS)) in workers exposed to Pb and Cd. Forty ...
Roberts J R - - 2001
OBJECTIVE: To determine the time for a decline in blood lead to less than 10 microg/dL in nonchelated children who are enrolled in case management. STUDY DESIGN: Retrospective analysis of venous blood lead data of lead-poisoned children followed in a case management program designed to decrease lead exposure. Children were ...
Hanly M G - - 2001
During the development and maturation of hematopoetic precursors, certain enzymes and associated substances, such as glycogen, are produced in the developing cells (1,2), which, if detected, can provide important clues to the lineage and classification of leukemias. Although the evaluation of abnormal populations of white blood cells has been greatly ...
Wrbitzky R - - 2001
This study was carried out to evaluate the internal exposure to polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDDs/PCDFs) of chimney sweeps in Bavaria compared to a control group without occupational exposure. The PCDD/PCDF concentrations in the blood fat of 227 chimney sweeps were compared with the concentrations in samples from 60 ...
Fiala J - - 2001
The main objective of the study was to asses whether the environmental cadmium exposure in the Czech Republic is high enough to be able to affect significantly the human reproduction. Cadmium levels were measured in the blood and follicular fluid of 220 women in in vitro fertilization (IVF) therapy, using ...
Kärrman E - - 2001
In an environmental systems analysis of four wasterwater systems, the environmental aspects were prioritised by normalisation of predicted impacts from the studied systems to the total impacts from society. Priority Group 1 (highest priority) consisted of discharges (flows) of nitrogen, cadmium, lead and mercury to water, recycling of nitrogen and ...
Karstaedt A S AS Department of Medicine, Chris Hani Baragwanath Hospital and University of the Witwatersrand, - - 2001
To determine the epidemiology of work-related exposure to blood among interns. Interns were invited to complete anonymously a questionnaire concerning their past percutaneous and mucocutaneous exposures to blood. Chris Hani Baragwanath Hospital, Soweto, and Johannesburg Hospital, Gauteng, where HIV infection is common among patients. Ninety-eight interns (96%) were surveyed. Sixty-nine ...
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