falciparum in the host cell Dimorphic allele segments, termed C-

falciparum in the host cell. Dimorphic allele segments, termed C-fragment and F-fragment, have been found in high endemicity malaria areas and associations between the dimorphism and severe malaria have been described. In this study, the genetic dimorphism of EBA-175 was evaluated in P. falciparum field isolates from Brazilian malaria endemic area.

Methods: The study was carried out in rural villages situated near Porto Velho, Rondonia State in the Brazilian Amazon in three time points between 1993 and 2008. The allelic dimorphism of the EBA-175 was analysed by Nested PCR.

Results: The classical allelic dimorphism of PFTα ic50 the EBA-175 was identified in the studied area. Overall,

C-fragment was amplified in a higher frequency than F-fragment. The same was observed in the three time points where C-fragment was observed in a higher frequency than F-fragment. Single infections (one fragment amplified) were more frequent than mixed infection (two fragments amplified).

Conclusions:

These Selleck JNJ-26481585 findings confirm the dimorphism of EBA175, since only the two types of fragments were amplified, C-fragment and F-fragment. Also, the results show the remarkable predominance of CAMP allele in the studied area. The comparative analysis in three time points indicates that the allelic dimorphism of the EBA-175 is stable over time.”
“Bacterial meningitis is a severe infection responsible for high mortality. This prospective study of 277 pediatric bacterial meningitis cases was done to identify factors predicting death in children < 16 years of age living and treated in a limited-resources country (Kosovo). Of the 277 children enrolled, Lazertinib nmr 60 patients (22%) developed neurologic complications, and 15 children died (5%). The following variables were strongly correlated with mortality: altered mental

status on admission (relative risk [RR] = 29.9), presentation of the initial cerebrospinal fluid as thick pus (RR = 29.9), prehospital seizures (RR = 23.5) and their recurrence > 24 hours after admission (RR = 11.5), age < 1 month (RR = 19.3), the use of inotropic agents (RR = 11.5), and admission after 5 days’ duration of illness (P < .001). The mortality rate in children in Kosovo is similar to those reported from developing countries, and this is most likely due to the unfavorable living conditions.”
“Background: Malaria due to Plasmodium falciparum is the leading cause of morbidity and mortality in Tanzania. According to health statistics, malaria accounts for about 30% and 15% of hospital admissions and deaths, respectively. The risk of P. falciparum infection varies across the country. This study describes the spatial variation and socio-economic determinants of P. falciparum infection in northeastern Tanzania.

Methods: The study was conducted in 14 villages located in highland, lowland and urban areas of Korogwe district.

Blood glucose level was assessed by a handheld glucometer Plasma

Blood glucose level was assessed by a handheld glucometer. Plasma GLP-1 and insulin level were evaluated by ELISA. GLP-1 level was also evaluated by immunohistochemistry analysis of GLP-1 expression in ileal mucosa and scanning electron microscope analysis of ultrastructural changes of L cells.

Under administration of nutrients in the distal ileum of equal length, GLP-1 levels were greatest for fat, then glucose, and then amino acid (the peak concentration of GLP-1 in the fat-10 cm

group, the glucose-10 cm group, the amino acid-10 cm group, and the control-10 cm group selleck products was 29.76 +/- 1.32, 28.54 +/- 1.29, 26.30 +/- 1.26, and 22.52 +/- 1.22 pmol/L, respectively, with p < 0.05). Under administration of nutrients in the distal ileum of equal length, insulin levels were also greatest for fat, then glucose, and then amino acid (the peak concentration of insulin in the fat-10 cm group, the glucose-10 cm group, the amino acid-10 cm group, and the control-10 cm group was 30.10 +/- 1.33, 27.17 +/- 1.27, 22.98 +/- 1.31, and 12.40 +/- 1.11 mU/L, respectively, with p < 0.05). Under administration of the same nutrients, the longer the distal ileum was stimulated, the greater the GLP-1 and

insulin levels.

Long distal ileal administration of fat more efficiently stimulated GLP-1 secretion, resulting in enhanced insulin secretion.”
“Individuals with a personal history see more of non-melanoma skin cancer (NMSC) are known to have an increased risk of subsequent cancers. However, most of the studies regarding this fact were done on Caucasian populations. We investigated whether Korean patients with NMSC have an increased risk of developing second cancers compared to the general Korean population. Five hundred and thirty-two patients diagnosed with NMSC at the Department of Dermatology of Yonsei University Health System from 1999 to 2008 were assessed for development of second cancers. The overall second cancer incidence was increased among patients diagnosed with NMSC compared with the general population in Korea: 37 second selleck compound cancer total (standardized incidence ratio [SIR] 1.38, 95%

confidence interval [CI] 1.101.90); 23 second cancers in males (SIR 4.24, 95% CI 2.696.36); and 14 second cancers in females (SIR 2.28, 95% CI 1.253.83). There were significantly increased incidence ratios for NMSC (eight second cancers [SIR 9.52, 95% CI 4.1118.77]), bladder cancer (four second cancers [SIR 4.21, 95% CI 1.1510.78]) and nasopharyngeal cancer (one second cancer [SIR 20.00, 95% CI: 1.5125.33]). Korean patients diagnosed with NMSC had more second cancers, particularly other skin cancers. This study provides additional evidence that NMSC may be a clinically significant and substantial risk factor for second cancers even in a Korean population, in which the incidence of NMSC is much lower than Caucasians.”
“Azygos vein aneurysm is very rare and most cases are detected incidentally.

The freeze-thawing technique was used to enhance the amount of Pr

The freeze-thawing technique was used to enhance the amount of Print 3G encapsulated into blank liposomes prepared using the hydration of lipid film procedure. Many factors may influence peptide entrapment, namely the number of freeze-thawing cycles, the lipid concentration, the peptide concentration, and the mixing time. Consequently,

a design of experiments was performed to obtain the best encapsulation efficiency while minimizing the number of experiments. The lipid concentration and the number of freeze-thawing cycles were identified as the positive factors influencing the encapsulation. As a result of the optimization, an optimum was found and encapsulation efficiencies were improved from around 30% to 63%. Liposome integrity was evaluated by photon correlation spectroscopy and freeze-fracture electron microscopy SB525334 supplier to ensure that the selected formulation possesses the required properties to be a potential candidate for further in vitro and in vivo experiments.”
“Colorectal cancer (CRC) and colorectal adenomas have in common a dysfunctional adenomatous polyposis coli suppressor gene (APC). This allows for activation of the oncogenic Wnt/beta-catenin Sonidegib solubility dmso pathway, resulting in cytosolic accumulation of beta-catenin, its translocation to the nucleus and

action as a cofactor for stimulation of gene transcription. Pharmacological approaches of CRC-chemoprevention are focused to prevention of this beta-catenin-mediated oncogenic signalling.

Among upregulated genes in tumour tissue is COX-2 which synthesises large amounts of PGE(2). PGE(2) inhibits apoptosis, acts proinflammatoiy and immunosuppressive and stimulates tumour angiogenesis and proliferation. In addition, COX-2 causes

oxidation (activation) of cocarcinogens. Aspirin and non-aspirin NSAIDs inhibit COX-2, subsequent PGE(2) formation and action by transcriptional and non-transcriptional mechanisms. These also include inhibition of generation of sphingosine-l-phosphate, an amplifier of these reactions and stimulation of NSAID-induced gene (NAG-1) which acts as an inhibitor. LCL161 purchase Aspirin additionally acetylates COX-2, resulting in generation of ‘aspirin-triggered’ lipoxins (ATL), a new class of anti-inflammatory/antitumour compounds. COX-1 inhibition might also contribute to antitumour effects of aspirin, for example at low-dose aspirin.

Experimental evidence suggests additional COX independent actions of aspirin and non-aspirin NSAIDs on oncogenic signalling. This includes modifications of transcription factors (NF kappa B), induction of apoptosis and DNA stabilization. In comparison to non-aspirin NSAIDs (sulindac, indomethacin) and coxibs (celecoxib), aspirin has the advantage of concomitant antiplatelet effects while NSAIDs rather have a thrombogenic potential.

Notwithstanding the electronic character of substituents

Notwithstanding the electronic character of substituents

in the aromatic ring of the isocyanates all reactions proceed through concerted asymmetric late transition states. The addition to the C=N bond is considerably more preferable than to the C=O bond. In the transformations under consideration the intermolecular donor-acceptor interactions between the reagents result in the appearance of abnormal selectivity.”
“Background: Cartilage graft is an effective method for reconstructing the bony framework of the face and covering the bony defect site. As a process method of cartilages, lyophilization has the advantages of long-term storage and easy handling. We hypothesized that the type of procedure used to sterilize lyophilized cartilage may affect outcomes after implantation into the body. We compared the effects of ethylene oxide (EO) gas, gamma-irradiation, and autoclaving methods on cartilage grafts.

Methods: SNX-5422 purchase After

sterilization, lyophilized human rib cartilage was inserted Bcl-2 inhibitor into subperiosteal pockets created in New Zealand white rabbit skulls. We assessed the weights and ratios of the remaining cartilage and examined histologic changes throughout the implantation period.

Results: Over a 5-week period, the gamma-irradiated grafts remained more than the other grafts, but after more than 5 weeks, there were no significant differences between gamma-irradiated and EO gas-sterilized cartilages. Autoclave-sterilized

cartilages were totally resorbed at 10 weeks.

Conclusions: Over 10 weeks of follow-up, based on persistence measurements and histologic appearance, there was little difference between gamma-irradiated check details and EO gas-sterilized lyophilized cartilage used in experimental bone grafts.”
“Objectives: Using reconstructed three-dimensional computed tomography (3D-CT) models, the purpose of this study was to analyze and compare mandibular condyle morphology in patients with and without temporomandibular disorder (TMD).

Study Design: Thirty-two patients were divided into two groups: the first comprised those with TMD (n=18), and the second those who did not have TMD (n=14). A CT of each patient was obtained and reconstructed as a 3D model. The 64 resulting 3D condylar models were evaluated for possible TMD-associated length, width and height asymmetries of the condylar process. Descriptive statistics were used to assess the results and student’s t tests applied to compare the two groups.

Results: Statistically significant (p<0.05) vertical, mediolateral and sagittal asymmetries of the condylar process were observed between TMD and non-TMD groups. TMD patients showed less condylar height (p<0.05) in comparison with their asymptomatic counterparts.

Conclusions: Using 3D-CT, it was shown that condylar width, height and length asymmetries were a common feature of TMD.

Kojic add is mainly produced by Aspergillus and Penicillium fungi

Kojic add is mainly produced by Aspergillus and Penicillium fungi and is commercially available as an effective whitening agent in the treatment of hyperpigmentary conditions, like melasma, postinflammatory hyperpigmentation, freckles, and lentigines. New esters of kojic acid have been evaluated in order to improve its depigmentation effects. The aim of this work was to synthetize kojic (di)stearate

and to investigate its depigmentation potential for cosmeceutical purposes. Kojic (di)stearate was successfully obtained by esterification PLX4032 in vitro using N,N’-dicyclohexylcarbodiimide/4-dimethylaminopyridine system. Histological sections of stained pig skin showed that a non-ionic cream containing 5.75% kojic (di)stearate provided enhanced depigmentation effect than kojic acid when used at equivalent concentration.”
“A Pseudomonas syringae pv. pisi effector protein, AvrRPS4, triggers RPS4-dependent immunity in Arabidopsis. We characterized biochemical and genetic aspects of AvrRPS4 function. Secretion of AvrRPS4 from Pst DC3000 is type III

secretion-dependent, and AvrRPS4 is processed into a smaller form in plant cells but not in bacteria or yeast. Agrobacterium-mediated transient expression analysis of N-terminally truncated AvrRPS4 mutants revealed that the C-terminal 88 amino acids are sufficient to trigger the hypersensitive response in turnip. GSK923295 clinical trial N-terminal sequencing of the processed AvrRPS4 showed that processing occurs between G133 and G134. The processing-deficient mutant, R112L, still triggers RPS4-dependent immunity, suggesting that the processing is not required for the AvrRPS4 avirulence function. AvrRPS4 enhances bacterial

growth when delivered by Pta 6606 into Nicotiana benthamiana in which AvrRPS4 Ferroptosis inhibitor is not recognized. Transgenic expression of AvrRPS4 in the Arabidopsis rps4 mutant enhances the growth of Pst DC3000 and suppresses PTI (PAMP-triggered immunity), showing that AvrRPS4 promotes virulence in two distinct host plants. Furthermore, full virulence activity of AvrRPS4 requires both proteolytic processing and the KRVY motif at the N-terminus of processed AvrRPS4. XopO, an Xcv effector, shares the amino acids required for AvrRPS4 processing and the KRVY motif. XopO is also processed into a smaller form in N. benthamiana, similar to AvrRPS4, suggesting that a common mechanism is involved in activation of the virulence activities of both AvrRPS4 and XopO.”
“This investigation examines the reliability, validity, and sensitivity of the Chinese version Pediatric Quality of Life Inventory (PedsQL) 4.0 Generic Core Scales and 3.0 cerebral palsy (CP) Module in pediatric CP.

The study sample was comprised of 126 parents of children with CP between the ages of 2 and 12 years including 18 child respondents 5-12 years of age. Mean age of the 87 boys (69.0%) and 39 girls (31.0%) was 4 years 1 month (SD 2 years 2 month).

These results were expressed as the concentrations that induce 50

These results were expressed as the concentrations that induce 50% inhibition of cell growth (IC50) in mu g/mL. Considering that, compounds 3b, 3e, 3h, 3n, 3r and 3u exhibited good cytotoxic activity against at least three cancer cell lines (0.7967-4.200 mu g/mL). In general, we observed that the presence of electron-withdrawing groups in the benzene ring is important for the anticancer activity in this series, such as fluorine (3h), chlorine (3b) amd bromine (3e) groups in meta position and nitro group (3r) in para position. These derivatives

could be considered interesting start points to develop a new anticancer drug and confirm the potential of chloroquine derivatives as lead compounds BTK inhibitor in anticancer drug discovery.”
“The negatively-charged nitrogen-vacancy (NV) center is the most studied optical center in diamond and is very important for applications in learn more quantum information science. Many proposals for integrating NV centers in quantum and sensing applications rely on their tailored fabrication in ultra pure host material. In this study, we use ion implantation to controllably introduce nitrogen into high purity, low nitrogen chemical vapor deposition diamond samples. The properties of the resulting NV centers are studied

as a function of implantation temperature, annealing temperature, and implantation fluence. We compare the implanted NV centers with native NV centers present deep in the bulk of the as-grown CP127374 samples. The results for implanted NV centers are promising but indicate, at this stage, that the deep native NV centers possess overall superior optical properties. In particular, the implanted NV centers obtained after annealing at 2000 degrees C under a stabilizing pressure of 8 GPa showed an ensemble linewidth of 0.17 nm compared to 0.61 nm after annealing at 1000 degrees C.

Over the same temperature range, the ensemble NV-/NV0 ratio increased by a factor of similar to 5, although this was accompanied by an overall decrease in the NV count. (C) 2011 American Institute of Physics. [doi:10.1063/1.3573768]“
“Epileptic seizures have historically been associated with religious beliefs in spirit possession. These attitudes and misconceptions about epilepsy still flourish in developing countries as byproducts of specific sociocultural environments. This article presents a case series of four Haitian patients with epilepsy whose seizures were initially attributed to Voodoo spirit possession. All patients reported ictal experiential phenomena (epigastric aura, ictal fear, depersonalization, and derealization symptoms) followed by complete loss of consciousness. Electroclinical investigations revealed a temporal lobe focus.

Methods: Twelve

Methods: Twelve selleck kinase inhibitor menopause women

(mean age 54.3 years, BMI 25.0 kg/m(2)) participated in a controlled cross-over study. Reference and test treatments were: R = tablets containing soy isoflavones 60 mg (genistin 30 mg + daidzin 30 mg) + calcium and vitamin D-3; E = R + 500 million vital spores of Lacto bacillus sporogenes (E is Estromineral (R), a food supplement containing soy isoflavones 60 mg, calcium 141 mg and vitamin D-3 5 mu g).

The design included 2 periods of 5 days of amoxicillin + clavulanate treatment with a 2-week wash-out. After each period alternatively a single dose of each formulation was given in randomised sequence. Genistein and daidzein were determined in plasma by HPLC, sampled 10 times within 24 h after dosing.

Results: Genistein pharmacokinetics parameters were higher after E than after R administration: peak plasma concentration (C-max) +24.3%, area under check details the concentration curve (AUC(0-24)) +24.4% and mean residence time +11.0%. Daidzein C-max and AUC showed a larger variability on R, evidenced by higher scatter from the mean

on the formulation without lactobacilli.

Conclusion: A trend is shown for a greater absorption of genistein from a formulation containing lactobacilli.”
“Objective: One type of test commonly used to assess auditory processing disorders (APD) is the Frequency Pattern Test, in which triads of pure tones of two different frequencies are presented, and participants are required to accurately report the sequence of tones, typically using a verbal response. The test is widely used clinically, but in its current format, is an under-exploited means of

addressing some candidate processes, such as temporal ordering and frequency discrimination, which might be affected in APD. Here we describe a computer-based version of an auditory pattern perception test, the BirdSong Game, which was designed HIF activation to be an engaging research tool for use with school-aged children.

Methods: In this study, 128 children aged 6-10 with normal peripheral hearing were tested. The BirdSong Game application was used to administer auditory sequential pattern tests, via a touch-screen presentation and response interface. A conditioning step was included prior to testing, in order to ensure that participants were able to adequately discriminate between the test tones, and reliably describe the difference using their own vocabulary. Responses were collected either verbally or manually, by having participants press cartoon images on the touch-screen in the appropriate sequence. The data was examined for age, gender and response mode differences.

Results: Findings on the auditory tests indicated a significant maturational effect across the age range studied, with no difference between response modes or gender.

Another strategy is to destroy the existing tumor vasculature, an

Another strategy is to destroy the existing tumor vasculature, and a number of vascular disrupting agents are being studied in preclinical and phase I trials. Antiangiogenic agents have a unique side effect profile, likely due to inhibition of normal physiologic angiogenesis.

Conclusions: Phase

II and early phase III trials have demonstrated that antiangiogenic therapies have significant activity in ovarian cancer. The results of phase III trials in the front-line and recurrent settings will determine the extent of clinical benefit BB-94 concentration of antiangiogenic therapies in combination with chemotherapy. Antiangiogenic agents have a distinct side effect profile, and further studies are necessary to evaluate how to minimize

the incidence of these events and to identify women most likely to benefit from these therapies.”
“Lignin, a major component of the cell click here wall of vascular plants, has long been recognized for its negative impact and treated as a by-product in a biorefinery. This highly abundant by-product of the biorefinery is undervalued and underdeveloped due to its complex nature. The development of value-added products from lignin would greatly improve the economics of the biorefinery. The inherent properties of lignin significantly affect the productivity of the biorefinery processes and its potential applications. Although the structure and biosynthetic pathway of lignin have been studied for more than a century, they have not yet been completely elucidated. In this mini-review, the primary obstacles to elucidating

the structure of native lignin, including separation and characterization, are highlighted. Several classical methods for separation and various NMR techniques, especially 2D HSQC NMR, for characterization of lignin are reviewed. Some potential applications of lignin are introduced. It is believed that a knowledge of the method to separate lignin from the cell wall and structural features of the lignin polymer from lignocellulosic materials will help to maximize the exploitation of lignocelluloses Geneticin research buy for the biorefinery as well as the utilization of lignin for novel materials and chemicals. (c) 2012 Society of Chemical Industry”
“Microsporogenesis, associated with the functional expression of many genes, is a highly programmed and regulated process in flowering plants. To elucidate the roles of genes during anther development, two anther-specific cDNAs (designated GhACS1 and GhACS2) encoding acyl-CoA synthetases (ACSs) were isolated from a cotton (Gossypium hirsutum) flower cDNA library. Subsequently, the corresponding GhACS1 gene was isolated from a cotton genomic DNA library. Real-time quantitative RT-PCR and northern blot analyses revealed that GhACS1 transcripts were predominantly accumulated in the developing anthers of cotton.

56, 1 75, and 2 54, respectively Pharmacokinetic

56, 1.75, and 2.54, respectively. Pharmacokinetic buy Citarinostat study was performed in rats by intratracheal administration of either placebo or developed dry powder inhalation (DPI) formulation. Pharmacokinetic parameters were calculated (Ka, Ke, T (max), C (max), AUC, and Vd) and these results indicated that developed formulations extended half life compared to conventional formulation with onefold to fourfold improved local and systemic bioavailability. Estimates of relative bioavailability suggested that developed formulations have excellent lung deposition characteristics with extended T (1/2) from 9.4 to 14 h compared to conventional formulation. Anti-inflammatory

activity of BUD and developed formulations was compared and found to be similar. Cytotoxicity was determined in A549 alveolar epithelial cell line and found to be not toxic. In vivo pulmonary deposition of developed conventional formulation was studied using gamma scintigraphy and results indicated potential in vitro-in vivo correlation in performance of conventional BUD DPI formulation. From the DPI formulation prepared Crenigacestat with porous particles, the concentration of BUD

increased fourfold in the lungs, indicating pulmonary targeting potential of developed formulations.”
“In this work, resonant and elastic properties of single crystal gold nanowires have been studied through classical molecular dynamics simulations. The considered nanowires have perfect square cross sections and are oriented with the [100] direction along the wire axis and with 100 side surfaces. Three different sizes were simulated; 4.08 X 4.08 nm(2), 5.71 X 5.71 nm(2), and 7.34 X 7.34 nm(2) cross sectional dimensions, with the respective unrelaxed lengths 49.0 nm, 68.5 nm, and 88.1 nm and the simulations were performed at two different temperatures, 4.2 K and 300 K. Tensile simulations reveal, that the stiffness decreases with decreasing size, and that the size dependence for nanowires at 4.2 K can be accurately described using the concept of surface energy. Comparing results from the resonant

simulations reveals that the fundamental eigenfrequency is in good agreement check details with predictions from Bernoulli-Euler continuum beam theory when the size dependence of the stiffness is taken into account. The eigenfrequencies of the first and second excited modes turn out to be low in comparison with analytical Bernoulli-Euler continuum calculations. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3460127]“
“Various segmented block copolyetheramides based on nylon6 (N6) and poly(ethylene oxide) (PEO) with different compositions and block length of the hard and soft segments were synthesized. The effect of composition of the hard and soft segments was studied via FTIR spectroscopy based on the characteristic peak of ester group at wave number of 1730 cm(-1). The average block length of the hard and soft segments in block copolymers was determined from H-NMR analysis.

To identify monitoring and research priorities the selected chemi

To identify monitoring and research priorities the selected chemicals were ranked using an assessment matrix approach. Compounds were evaluated based upon environmental persistence, human toxicity, evidence of bioaccumulation in humans and the environment, evidence of ecotoxicity and the number and quality of studies focussed on the contaminant internationally. The identified chemicals of concern were ranked in

decreasing order of priority: perfluorinated chemicals (PFOS, PFOA); polychlorinated alkanes (PCAs), polychlorinated naphthalenes (PCNs); organotins (OTs), polybrominated diphenyl ethers (PBDEs), triclosan (TCS), triclocarban (TCC); benzothiazoles; antibiotics and pharmaceuticals; synthetic musks; bisphenol A. quaternary ammonium compounds DNA-PK inhibitor (QACs), steroids; phthalate acid esters ( PAEs) and polydimethylsiloxanes (PDMSs).

A number of issues were identified and recommendations for the prioritisation of further research and monitoring of ‘emerging’ OCs for the agricultural use of biosolids are provided. In particular, a number of ‘emerging’ OCs (PFOS, PFOA and PCAs) were identified for priority attention that are environmentally

persistent and potentially toxic with unique chemical properties, or are present in large concentrations in sludge, that make it theoretically possible for them to enter human and ecological food-chains from biosolids-amended soil. (C) 2010 Elsevier Ltd. All rights reserved.”
“A pregnant woman at 32 weeks of gestation was referred

because of untypical visualization of a three-vessel tracheal view. Detailed ultrasound buy SB203580 examination demonstrated an abnormal position of descending aorta, positioned at the right-front side of the spine at the level of four-chamber view. The descending aorta was connected with left pulmonary artery through ductus arteriosus, which configured a vascular ring. Right aortic arch with mirror-image branching without any associated anomaly was suspected prenatally. Amniocentesis showed no chromosomal find more abnormality. A male, 2440-g infant was delivered vaginally at 37 weeks and 4 days of gestation. Echocardiography confirmed no associated congenital heart defect. Three-dimensional reconstruction using 64-slice spiral computed tomography angiography at 2-months old confirmed the diagnosis of right aortic arch with mirror-image branching. The infant is now 1 year old and well developed without any symptoms.”
“The subject of this paper is lead (Pb) additives in gasoline and their material and health impact from Pb dust inputs into 90 US urbanized areas (UAs). The mass of Pb additives for 90 UAs as a total of the US Pb additives in 1982 were estimated from vehicle travel, vehicle fuel economy (miles/gallon), ratio of leaded to unleaded fuel, and Pb/gallon. About 500 billion (109) miles of travel in 90 UA’s during 1982 account for similar to 18,000 metric tons (MT), or nearly 30% of the US Pb additives in 1982.