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Lead(II) nitrate - Wikipedia, the free encyclopedia The chemical compound lead(II) nitrate is the inorganic salt of nitric acid and lead. Lead nitrate is used in the manufacture of matches and special explosives such as lead azide, in mordants for dyeing and printing calico textiles, in the manufacture of lead compounds, as heat stabilizer in nylon and polyesters, as coating of photothermograpic paper, and rodenticides. Is it reported that lead nitrate has an effect on the leaching process in gold cyanidation, improving speed and yield, particularly in processing partially oxidized ores. en.wikipedia.org /wiki/Lead_(II)_nitrate   (436 words)

LEAD STILL A PROBLEM IN Like calcium, lead becomes deposited in the bones, and is mobilized in times of stress, fatigue, growth and reproduction; hence the effects of lead are amplified in children and pregnant women. The effects of lead are vague and lead poisoning, especially chronic low level poisoning, is difficult to diagnose, hence it is usually detected in the latter stages, where the damage is already done, and the effects are relatively permanent. Chronic exposure to lead has been confirmed as leading to memory loss, and reduced IQ levels in children, along with anemia, hearing and speech impairment, low resistance to diseases, mental retardation, reduced growth and stature, brittle bones, degradation of posture, muscular dysfunction and kidney dysfunction. www.nalis.gov.tt /Health/Health/health_leadpoisoning.html   (1100 words)

ATSDR - ToxFAQs™: Lead Lead is a naturally occurring bluish-gray metal found in small amounts in the earth's crust. Lead itself does not break down, but lead compounds are changed by sunlight, air, and water. CDC considers a lead level of 10 µg/dL to be a level of concern for children. www.atsdr.cdc.gov /tfacts13.html   (1190 words)

EPA Ground Water & Drinking Water > breadcrumb? > Consumer Factsheet on: LEAD The Action Level for lead has been set at 15 parts per billion (ppb) because EPA believes, given present technology and resources, this is the lowest level to which water systems can reasonably be required to control this contaminant should it occur in drinking water at their customers home taps. Lead may occur in drinking water either by contamination of the source water used by the water system, or by corrosion of lead plumbing or fixtures. Lead is rarely found in source water, but lead mining and smelting operations may be sources of contamination. www.epa.gov /safewater/contaminants/dw_contamfs/lead.html   (973 words)

EPA TRI: TRI Lead Rule The TRI lead rule lowers the reporting thresholds for lead and lead compounds to 100 pounds because lead and lead compounds are persistent bioaccumulative toxic (PBT) chemicals. PBT chemicals, such as lead and lead compounds are of concern not only because they are toxic, but also because they remain in the environment for long periods of time, are not readily destroyed, and build up or accumulate in body tissue. Lead and lead compounds are also of particular concern because of their toxicity in children. www.epa.gov /tri/lawsandregs/tri_pb_rule.htm   (650 words)

Lead Lead was, indeed, used in machines of all kinds, not as a structural material, but where its fusibility and workability were an advantage, and for many small items of daily use. Lead is still used for sheathing cables, in bearing alloys, in artistic pigments and glazes, for decorative glass, in the chemical industry, and, of course, for bullets, which have always been in special demand in the United States. Now, lead is a systemic poison, but its use in paint and motor fuel was thought safe because nobody ate paint or scraped it into their coffee, and there was lots of air to dilute the lead coming out of exhaust pipes. www.du.edu /~jcalvert/phys/lead.htm   (8222 words)

Lead and TRI Reporting   (Site not responding. Last check: 2007-10-11) The threshold for most toxic chemicals including lead and lead compounds was previously set at 25,000 pounds (for chemicals "manufactured" or "processed") or at 10,000 pounds (for chemicals "otherwise used"). Lead that is incorporated in stainless steel, brass, and bronze alloys can still count, but only under the old 25,000 or 10,000 pound thresholds. Multiply the lead concentration of raw wastewater by 1.16 to calculate the quantity of lead compound "manufactured". www.nmfrc.org /tri.cfm   (2515 words)

lead compound Lead compounds are present as gasoline additives, in paint, ceramic products, roofing, caulking, electrical applications, tubes, or containers. Lead in the air is primarily due to lead-based fuels and the combustion of solid waste, coal, oils, and emissions from alkyl lead manufacturers, wind blown dust volcanoes, the burning of lead-painted surfaces, and cigarette smoke. Lead in drinking water comes from leaching from lead pipes, connectors, and solder in both the distribution system and household plumbing. www.eionet.europa.eu /gemet/concept?cp=4724   (100 words)

Metallic coatings effects in plastic packaging applications The lead frames were encapsulated with a molding compound (6300 HJ supplied by Sumitomo, Japan) using a transfer- molding machine at 175[degrees]C. The 6300 HJ is an O-Cresol novalac- based epoxy with a 71-74 wt.% silica-filler content. The interface-bond strength between the molding compound and lead frame was measured in terms of the maximum force required to debond the lead frame from the encapsulant. The amine-cured molding compound was relatively nonpolar with a near-zero polar component of the surface energy (its polar and dispersive components, respectively, are [upsilon]^sup P^^sub 2^ = 0.54 mN/m and [upsilon]^sup d^^sub 2^ = 29.0 mN/m). www.jobwerx.com /news/Archives/adhesion_plastics_2003_.news_07_09_03.html   (4253 words)

eMedicine - Toxicity, Lead : Article by Rania Habal, MD Gastrointestinal absorption of lead is less effective and depends on a number of factors, eg, the presence of food in the stomach, the concentration of lead ingested, the nutritional status of the patient, and the age of the patient. Lead is commonly incorporated into rapidly growing bones, such as the tibia, femur, and radius, where it competes with calcium and may exert toxic effects on skeletal growth. Lead that is not retained by the body is excreted unchanged in urine (65-75%) and in bile (25-30%). www.emedicine.com /MED/topic1269.htm   (6261 words)

New Barrier to Lead Paint Saves Time and Money Lead Barrier Compound can be brushed, rolled or sprayed on, and it seals in ("encapsulates") the lead-based paint surface. Lead Barrier Compound actually prevents the migration of lead to the surface, thus eliminating future lead dust contamination and potential liability. Lead Barrier Compound, a water-based non-toxic blend of polymers and resins, blended specifically to form a barrier to lead-based paint. www.chiefengineer.org /content/content_display.cfm/seqnumber_content/693.htm   (599 words)

Compound could lead to a new generation of antibiotics that battle resistance The new compound is active against Pseudomonas aeruginosa, the gram-negative infection that strikes — and usually kills — cystic fibrosis patients and many others whose immune systems are compromised. The compound and the method the UB scientists used to develop it are described in the current (January 25, 2003) issue of Chemistry & Biology. By disrupting the communication process, he explained, the new compound could lead to drugs that will prevent the formation of biofilms, restoring the potency of antibiotic treatments and limiting the development of antibiotic resistance. www.buffalo.edu /home/article_quorum.shtml   (726 words)

IPC - Reporting Lead Air Emissions   (Site not responding. Last check: 2007-10-11) A compound is chemically bound, such as lead oxide (dross). The lead in solder is not chemically bound to the other metals in the solder. The lead in the solder can be reported as either lead or lead compounds. www.ipc.org /contentpage.asp?PageID=3.4.1.5.14   (89 words)

[No title]   (Site not responding. Last check: 2007-10-11) Drug discovery research relies heavily on bioinformatics to manage the databases of small molecules that are potential lead compounds, to search databases of protein structures for structure-based drug design methods, and to model the docking of compounds and their target proteins. A lead compound is a small molecule that serves as the starting point for an optimization involving many small molecules that are closely related in structure to the lead compound. The refined lead compound is then synthesized and complexed with the target, and further refined in a reiterative optimization process. cnx.rice.edu /content/m11113/2.1/source   (1077 words)

Clark Group - Group Members - Umar Akbar Since combinatorial chemistry, the method currently used to generate pharmaceutical leads, is geared primarily towards lead compound discovery rather than optimization, the initial lead compounds developed by this method typically lack several desired pharmacokinetic properties such as reaction selectivity, high potency and bioavailability, and reduced toxicity. However, the primary reason for the choice of Indinavir as the lead compound for combinatorial biocatalysis is its pharmacological importance, particularly as a newly developed HIV-1 protease inhibitor as part of a treatment regimen for AIDS, as well as the availability of an activity screen using HIV protease. Employ combinatorial biocatalysis techniques to derivatize lead compounds attached to solid supports - this aspect represents one of the core aims of the Clark research group during the previous decade. www.cchem.berkeley.edu /~clarkgrp/Group_Members/umar_akbar.htm   (450 words)

Environmental Protection Agency - EPA Press Release: EPA EXPANDS THE RIGHT TO KNOW ABOUT LEAD The reporting threshold previously required that facilities report lead and lead compound emissions to the air, water and land if they manufacture or process more than 25,000 pounds annually or use more than 10,000 pounds annually. Once in the body, lead is distributed to the blood, soft tissue, and bone. Lead exposure can lead to damage to the brain and central nervous system, slow growth, hyperactivity and learning problems. yosemite.epa.gov /opa/admpress.nsf/b1ab9f485b098972852562e7004dc686/7e185f44de5bec49852569ce007016ac?OpenDocument   (543 words)

Empirical Formula of a Compound The empirical formula of a compound tells us the types of atoms present in a compound as well as the simplest whole-number ratio of the different types of atoms. An ionic compound is three-dimensional array of ions, which are present in a definite ionic ratio that is characteristic of the compound. The resulting lead nitrate solution is then allowed to react with sodium iodide, NaI, solution to form insoluble lead iodide, which is filtered, dried, and weighed. wwwchem.csustan.edu /chem1102/empirical.htm   (1118 words)

Tetraethyl lead definition - Medical Dictionary definitions of popular medical terms He appointed a panel of experts to investigate the recent fatalities that had "occurred in the manufacture and mixing of the concentrated tetraethyl lead." The panel was also asked to weigh "the possible danger" that might arise "from...wide distribution of a lead compound" through its sale as a gasoline additive. Seven months was "not sufficient," argued the panel, "to produce detectable symptoms of lead poisoning" in experimental subjects because of the very slow gestation of that toxicological syndrome. Longer experience may show that even such slight storage of lead as was observed [among human guinea pigs] in these [1925] studies may lead eventually to recognizable lead poisoning or to chronic degenerative diseases of a less obvious character. www.medterms.com /script/main/art.asp?articlekey=40211   (921 words)

XOMA Corp. Develops Lead Antifungal Compound Mycoprex(tm) The company has selected a lead compound and several alternates to move from the research phase into an intensive process of product development. XOMA's goal is to submit an IND for its lead compound, Mycoprex(tm), for one or more indications by the end of 1996. Based on these findings, the company initiated a program to screen for compounds with a broad spectrum of fungicidal activity and in vivo potency at least comparable to amphotericin B (the most potent fungicidal currently available), but with a better safety profile. www.docguide.com /dg.nsf/PrintPrint/3381325F5C50FD8B852562DF0080D5BC   (600 words)

Working Group: Compound Evaluation and Natural Products Initiative (full text) In drug discovery, GDR supports research to identify lead compounds that can be taken forward into lead optimization with other organizations or, in certain cases, drug candidates that can be taken forward by TDR, in partnership with other organizations, into human trials. In order to merit support, a lead compound must show good efficacy and no overt toxicity in an appropriate animal model, and have the potential to be improved by chemical means. In addition GDR proactively solicits compounds from research groups in academia and in industry that have compounds thought to have potential as leads to new drugs for the TDR diseases. www.who.int /tdr/grants/workplans/cen4.htm   (1126 words)

Anticonvulsant lead compound identified - Drug Development : Epilepsy.com Initially the compounds were administered intraperitoneally to mice and examined in the maximal electroshock (MES), subcutaneous pentylenetetrazole (scPTZ) and neurotoxicity (NT) screens, explained J.R. Dimmock and coauthors at the University of Saskatchewan. The biodata revealed that anticonvulsant properties were displayed by most of the compounds in series (1), in half of the semicarbazones (2) while protection was absent by members of series (3). The IC50 values of all of the compounds towards murine P388 cells were in excess of 50 microM while several compounds displayed cytotoxicity towards Mycobacterium tuberculosis, the researchers noted in conclusion. www.epilepsy.com /newsfeed/pr_1098451801.html   (378 words)

CHI's World Pharmaceutical Congress The ability to quickly evaluate 30 compounds week/program with respect to pharmacokinetics (rat and dog), microsome stability and hepatocyte stability empowers a project team to identify the optimal PCC or proof of concept (POC) compound in short order. The goal of lead optimization is to optimize potency, selectivity and efficacy of leading compounds. Lead optimization typically requires the synthesis of hundreds of compounds over the course of several years until the desired pharmacological profile is met (affinity, safety, PK, ADME etc.). www.worldpharmacongress.com /06_htl.asp   (2275 words)

Clinical Trials on Lead Carbohydrate Compound To Prevent Metastasis GBC-590 is a novel carbohydrate-based compound that is believed to disrupt the cellular recognition processes identified in cancer and metastasis. One of GBC-590's biological activities is based on its ability to bind with unique lectins (proteins which have a high affinity for carbohydrates) on the surface of cancer cells. The compound appears to work as an anti-adhesive by blocking the binding site of cancer cells (the lectins) and preventing individual cancer cells from metastasizing. www.docguide.com /dg.nsf/PrintPrint/7FA2949AAC345EA08525641F0068F63C   (393 words)

Intercept Pharmaceuticals Announces Publication of Study Demonstrating Its Lead Compound Can Reverse Liver Fibrosis Liver fibrosis is the process of chronic scarring that leads eventually to cirrhosis and liver failure. I look forward to working with the Intercept team to rapidly advance INT-747 and associated compounds towards human clinical testing." Intercept's lead compound, a potent, orally bioavailable FXR agonist formerly known as 6ECDCA, was discovered in 2001 through a collaboration between GlaxoSmithKline and University of Perugia scientists. FXR is known to be expressed in the liver, intestine and kidney, and Intercept intends to continue to lead research efforts to fully elucidate the therapeutic potential of this target. www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/08-12-2004/0002230486&EDATE=   (572 words)

EraGen: TACS Technology   (Site not responding. Last check: 2007-10-11) Conventional pharmaceutical combinatorial chemistry, while useful for lead optimization (modifications made after a lead compound has been found), has thus far been disappointing regarding new drug discovery, that is, finding the lead compound in the first place ("lead finding"). TACS uses the target to promote binding of members of multiple classes of compounds in a reaction mixture, one at a time, while favoring formation of those compounds that bind to the target strongly. Classical: Because the compounds are synthesized and then screened against the target, time and resources are spent synthesizing compounds that do not bind the target. www.eragen.com /discovery/TACS.html   (498 words)

PRESS RELEASE NicOx announces Pfizer's exercise of option to develop lead compound from ophthalmology collaboration   (Site not responding. Last check: 2007-10-11) Pfizer and NicOx were jointly responsible for this research project, in which a number of nitric oxide-donating compounds were synthesized and submitted to an extensive series of preclinical tests. Several compounds successfully fulfilled a number of key criteria and demonstrated superior activity, compared to reference compounds, in established in vivo eye disease models. The research, option, development and licensing agreement between Pfizer and NicOx was signed in August 2004 and granted Pfizer an option to acquire a worldwide license to the nitric oxide-donating compounds under study, with exclusive development and commercialisation rights. www.marketwire.com /mw/release_html_b1?release_id=102038   (514 words)

Press Releases: Pharmacopeia The milestone involves Pharmacopeia's identification of a Lead Compound that met potency and other selectivity criteria in its Lead Discovery Services agreement with Schering AG. Under the terms of the Lead Discovery Services agreement signed in October 1998, Pharmacopeia agreed to screen its multi-million compound sample collection of diverse, small molecules against multiple targets chosen by Schering AG. Pharmacopeia identified this Lead Compound in the first of several assays performed on behalf of Schering AG. www.pharmacopeia.com /wt/page/press/pr_1112122797   (700 words)

Empirical Formula of a Compound The resulting lead nitrate solution is then allowed to react with sodium iodide, NaI, solution to form insoluble lead iodide, This precipitate is collected by filtration, dried, and weighed. From the experimental data you can calculate the percentage composition and the ratio of moles of iodine to moles of lead in the compound, and thus determine the empirical formula. Use this filter paper to filter the lead iodide precipitated in trial 1. science.csustan.edu /byrd/CHEM1102/empirical.htm   (952 words)

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