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Daily News Blog

Archive for the 'Antibacterial' Category


05
Oct

EPA Fines Logitech for Antibacterial Claims, Consumers Are Misled by Marketing of Products with Antimicrobials

(Beyond Pesticides, October 5, 2011) The U.S. Environmental Protection Agency (EPA) has ordered computer peripherals maker Logitech, Inc. to pay a fine of $261,000 for illegally advertising one of its keyboards as protecting users from bacteria and microbes. EPA found that the company made unsubstantiated public health claims about its keyboard, a violation of federal law. However, the widespread marketing of hundreds of products that are advertised as containing antibacterial ingredients (without a health claim), which EPA maintains is not technically illegal, underscores the misconception consumers have when purchasing products that incorporate ”˜antibacterials.’ Beyond Pesticides has ueged EPA to prohibit more broadly advertising references to these antibacterial ingredients, since they imply that public health protection extends to the user when in fact it does not. Logitech”˜s keyboard incorporates a pesticide- AgION silver -and then alleges protection from bacteria and other microbes. According to EPA, the company marketed the keyboard as protecting the user from bacteria and microbes. However, to promote the health benefits in this way, before products can be sold their product efficacy must be established in compliance with EPA guidelines under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). Evidence found online and during an investigation in 2008 […]

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30
Sep

Triclosan Among Chemicals Detected in Narragansett Bay

(Beyond Pesticides, 9-30-11) Researchers from the University of Rhode Island (URI) have detected the antimicrobial triclosan and other toxic chemicals in the waters of Narragansett Bay off the coast of Rhode Island. The chemicals are a group of hazardous compounds that are common in industrial processes and personal care products but are not typically monitored by the U.S. Environmental Protection Agency (EPA). Rainer Lohmann, Ph.D., associate professor of chemical oceanography, and graduate student Victoria Sacks, with the help of 40 volunteers, tested for the presence of the chemicals in 27 locations throughout the bay. The compounds were found at every site. “Being exposed to these compounds is the hidden cost of our lifestyle,” said Dr. Lohmann. “It’s frustrating that as we ban the use of some chemical compounds, industry is adding new ones that we don’t know are any better.” Although the chemicals were detected at very low levels, research has shown that many chemical compounds can still be quite toxic, even at low doses. Additionally, since triclosan is an antimicrobial agent, low concentrations provide the perfect environment in which to breed and select for bacteria that resist the effects of the chemical. “By themselves, none of these results makes […]

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28
Sep

Experts Warn of Nano Resistance, Call for Oversight

(Beyond Pesticides, September 28, 2011) Overuse of antibacterial agents contributes to promoting the development of more powerful bacteria that are resistant to treatment. This, according to a new report released by Friends of the Earth in which leading microbiologists warn that the rapid rise in household antibacterial products containing nanosilver could put public health at risk. The report emphasizes that as the numbers of deaths caused by bacterial resistance to antimicrobials and antibiotics in hospitals continues to rise, as well as increasing allergy incidents, the need to regulatory oversight is urgently needed. Dozens of socks, shoe inserts, sports clothing and towels now marketed as ”˜antibacterial’ or ”˜odor controlling’ use nanoparticles of silver to kill the bacteria that cause odor. Since nanosilver can be manufactured as spheres, particles, rods, cubes, wires, film and coatings, it can be embedded into a range of substrates, such as metals, ceramics, polymers, glass and textiles leading to its widespread commercialization. To see a listing of products that contain nanosilver see here. In interviews for this report, entitled, “Nano-silver: Policy Failures Put Public Health at Risk,” published by Friends of the Earth, medical experts warn that using such a powerful antimicrobial in these everyday products is […]

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15
Aug

Conversion to Organic Poultry Farming Lowers Risk of Antibiotic-Resistant Bacteria

(Beyond Pesticides, August 15, 2011) Poultry farms that have adopted organic practices and cease using antibiotics have significantly lower levels of drug-resistant enterococci bacteria that can potentially spread to humans, according to a new study published August 10, 2011 in the online edition of Environmental Health Perspectives. The study, led by researchers at the University of Maryland’s School of Public Health, suggests that organic conversion of U.S. poultry farms can result in immediate and significant reductions in antibiotic resistance for some bacteria. The non-therapeutic use of antibiotics in livestock production accounts for nearly 80% of all antibiotics used in the United States. Typically, low levels of antibiotics are administered to animals through feed and water to prevent disease and promote growth. This is generally done to compensate for overcrowded and unsanitary living conditions, as is common in concentrated animal feeding operations (CAFOs), and to fatten livestock to get them to market sooner. Antibiotic use is prohibited in the production of all animal products labeled organic. “We initially thought we would see some differences in on-farm levels of antibiotic-resistant enterococci when poultry farms transitioned to organic practices. But we were surprised to see that the differences were so significant across several […]

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20
Jul

Tell Bath and Body Works to ‘Spread Love and Not Toxics’

(Beyond Pesticides, July 20, 2011) With flavors like “tangelo orange twist,” and “sugar lemon fizz,” popular body care chain, Bath and Body Works, has marketed an entire line of antibacterial body care products to teens and young adults. Unfortunately, these products contain the toxic hormone disruptor and water contaminant, triclosan, which could be hazardous to teenagers whose bodies are still developing. Join Beyond Pesticides, Center for Environmental Health, and The Campaign for Safe Cosmetics in asking Bath and Body Works to stop selling triclosan products that claim to “Spread Love, Not Germs.” The Bath and Body Works antibacterial line, which includes products with names like “Tangelo Orange Twist” and “Sugar Lemon Fizz,” is marketed to teenagers using the slogan “spread love, not germs.” Although not listed on their website, this antibacterial line and others sold by the company contain triclosan as their main germ fighting ingredient. Beyond Pesticides in 2004 began voicing concern about the dangers of triclosan and in 2009 and 2010, submitted petitions to the U.S. Food and Drug Administration (FDA) and the U.S. Environmental Protection Agency (EPA), calling for the removal of triclosan from consumer products. Since then many major companies are quietly and quickly removing triclosan […]

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27
May

Groups Sue FDA to Restrict Antibiotics in Livestock Feed

(Beyond Pesticides, May 27, 2011) A coalition of environmental and public health groups filed a lawsuit yesterday against the federal Food and Drug Administration (FDA) to require the agency to enforce strict standards regarding the routine use of antibiotics in livestock feed. The suit, filed by the Natural Resources Defense Council, the Center for Science in the Public Interest, Food Animal Concerns Trust, Public Citizen, and the Union of Concerned Scientists, calls on FDA to implement regulations based on its own findings that the routine use of low doses of antibiotics in animal feed presents increased risk for the development of resistant bacteria. The non-therapeutic use of antibiotic drugs in animal feed presents a serious risk to public health due to the potential for bacteria to develop resistance to the drugs as a result of repeated low dose exposure. The rise of drug-resistant infections in humans has been linked to the overuse of antibiotics in animal feed since the early 1970s, but FDA has failed to meet its legal responsibility to address the mounting health threat posed by the practice, according to the groups’ suit. The coalition’s suit would also force the agency to respond to citizen petitions filed by […]

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13
Apr

EPA Urged To Ban Toxic Antibacterial Chemical Linked to Hormone Disruption and Widespread Water Contamination, as Comment Period Closes

(Beyond Pesticides, April 13, 2010) In response to a petition submitted to the U.S. Environmental Protection Agency (EPA) calling for a ban on the non-medical uses of triclosan, Beyond Pesticides is again urging the agency to halt the use of the antibacterial triclosan in consumer products. Citing recent scientific evidence detailing hormone disruption, impaired fetal development, water and crop contamination, the petitioners state that given the emerging science and the violation of numerous environmental statues by triclosan’s use constitutes placing a ban on the chemical. In comments submitted in support of the petition, Beyond Pesticides state that such a dangerous chemical has no place on the consumer marketplace. “The nonmedical uses of triclosan are frivolous and dangerous, creating serious long-term health problems and environmental hazards associated with its continued use. EPA has a responsibility to ban consumer triclosan use in a marketplace where safer alternatives are available to manage bacteria” said Jay Feldman, executive director of Beyond Pesticides. Triclosan’s impact on the consumer market has been aided by a false public perception that antibacterial products are best to protect and safeguard against potential harmful bacteria. However, research into triclosan’s health and environmental impacts shows triclosan does more harm than good, […]

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09
Mar

Study Documents Triclosan’s Failure To Kill Bacteria in Hospital Settings

(Beyond Pesticides, March 9, 2011) A recent study reports that the underlying cause of a fatal outbreak of P. aeruginosa in a hospital came from the contamination of triclosan soap dispensers, which acted as a continuous source of the bacterium. The contaminated triclosan soap infected the hands of health care workers and then patients, since triclosan is shown to have no effect on P. aeruginosa -a bacterium frequently associated with hospital-acquired infections. Authors of the study recommend alcohol-based sanitizers where appropriate, instead of triclosan soaps. The study, “Molecular Epidemiology of a Pseudomonas aeruginosa Hospital Outbreak Driven by a contaminated Disinfectant-Soap Dispenser,” published online in PLoS One, investigates a fatal epidemic of P. aeruginosa that occurred in a hematology unit in Italy. The researchers found that patients became indirectly infected (e.g., during central venous catheter handling through contaminated items) and the triclosan soap dispenser acted as a common continuous source of P. aeruginosa infection. Since P. aeruginosa is intrinsically not susceptible to triclosan, the use of triclosan-based disinfectant formulations should be avoided in those health care settings hosting patients at high risk of P. aeruginosa infection, the authors conclude. Immunocompromised patients, especially chemotherapy patients, are especially at risk. Soap dispensers in […]

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22
Feb

Antibacterial Soap Suspected of Making Patients Sick

(Beyond Pesticides, February 22, 2011) After witnessing a patient’s condition improve upon discontinuing the use of antibacterial products containing the active ingredient triclosan, Gerard Guillory, M.D. of Denver, Colorado believes that several of his patients are experiencing health problems caused by daily exposure to the chemical. Dr. Guillory told local ABC 7 News: Denver Channel that he was treating his patient, Mary Lou Simanovich, for hyperthyroidism and asked her about antibacterial soap, which she had been using for years. After Ms. Simanovich stopped using soaps containing triclosan, both she and Dr. Guillory noticed improvements in her condition and overall health. “I feel better now. That’s all I can say and I think there’s an association,” said Ms. Simanovich to the Denver Channel. Antibacterial agents like triclosan, found in many antibacterial products, are linked to a host of adverse health and environmental effects including hormone disruption, possible impaired fetal development, and water and food contamination. Triclosan is an endocrine disruptor and has been shown to affect male and female reproductive hormones and is also shown to alter thyroid function. “My suspicion is that if it’s damaging the thyroid, it’s probably damaging other organs in the body,” said Dr. Guillory to the […]

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03
Feb

Another Company Pulls Triclosan from Products; Public Comment Period Extended

(Beyond Pesticides, February 3, 2011) Following numerous developments on the antibacterial pesticide triclosan in consumer products over the last year, including several published studies highlighting the serious adverse effects of exposure, the submission of a federal petition calling for the ban of the chemical, and increased consumer awareness, experts are urging companies to take precautions and remove the ingredient from their products. Newest on the list of companies to remove triclosan is GlaxoSmithKline, which has removed the chemical from its Aquafresh and Sensodyne toothpastes, as well as its Corsodyl mouthwash. Recently Colgate-Palmolive, makers of Colgate Total and Softsoap antibacterial hand soaps, has removed triclosan from most of its products, excluding its Total brand toothpaste, a line that the company claims fights gingivitis. However, as Elizabeth Salter Green, director of ChemTrust, a UK-based health and environmental organization, says in Cosmetics Design: “If one eats the right foods and maintains correct dental hygiene, then triclosan, or other antibacterial agents are not needed.” Antibacterial Soap: Public Health Survey In response to a recent survey on antibacterial soap by the chemical industry, Beyond Pesticides has released its own survey questions about the health and environmental issues surrounding antibacterial cleansers and asks that you share […]

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10
Jan

Under Growing Market Pressure, Company Pulls Triclosan from Products

(Beyond Pesticides, January 10, 2011) Since the submission of a federal petition last year calling for the ban of the antibacterial pesticide triclosan from consumer products, along with numerous published studies highlighting the serious adverse effects resulting from exposure, as well as increased consumer awareness, major companies are succumbing to public pressure to remove this chemical from their products. Recently Colgate-Palmolive, makers of Colgate Total and Softsoap antibacterial hand soaps, has removed triclosan from most of its products. Numerous developments last year, including the petition to ban triclosan submitted by Beyond Pesticides and Food and Water Watch along with over 80 environmental and public health groups, citing triclosan’s violation of numerous federal statues, as well as the increasing scientific data on triclosan’s hormone disrupting effects and long-term environmental contamination, have placed triclosan under media and congressional scrutiny. Companies are now quietly moving to remove triclosan from their products ahead of potential regulatory action and increasing consumer and retailer rejection. Colgate-Palmolive is reformulating its popular soap products to exclude triclosan. The orange-colored ”˜Ultra-Palmolive Antibacterial,’ the antibacterial dish-cleaning liquid will no longer contatin triclosan as its active ingredient and will no longer make the claim of being a “hand soap,” but will […]

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07
Jan

EPA Cited for Ineffective Regulation of Antimicrobials

(Beyond Pesticides, January 7, 2011) The Office of the Inspector General (OIG) for the U.S. Environmental Protection Agency (EPA) has released a report criticizing the agency’s lack of regulation concerning antimicrobial products. Citing a number of failures, the report finds that the EPA’s Antimicrobial Testing Program (ATP) has been largely inadequate in testing products to ensure safety and efficacy, and has failed to remove products that did not meet program standards. This report is especially of concern because some antimicrobials, such as triclosan, are known to cause dangerous public health and environmental hazards. Triclosan is one of the most prevalent antibacterial compounds found in products ranging from soaps and toothpastes to fabrics and toys. Studies have increasingly linked triclosan (and its chemical cousin triclocarban), to a range of adverse health and environmental effects, from skin irritation, allergy susceptibility, bacterial, endocrine disruption and compounded antibiotic resistant, tainted water, and dioxin contamination to destruction of fragile aquatic ecosystems. Through ATP, antimicrobial products including hospital disinfectants and tuberculocides are meant to be tested to ensure that they meet health standards and that the claims on the product labels are accurate. However, OIG has found that “EPA’s implementation of the ATP has not delivered […]

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05
Jan

Public Comment Needed on Ban Triclosan Petition by Feb.7, 2011

(Beyond Pesticides, January 5, 2011) Your voice is critical in generating public comments on a petition, published in the Federal Register, to ban the antibacterial chemical triclosan. As you may know, this chemical, now found in the bodies of 75% of the U.S. population, is linked to endocrine disruption, bacterial and antibiotic resistance, dioxin contamination, and contaminated fish and biosolids. We have five more weeks —until February 7, 2011— to let EPA know that triclosan must be banned to protect the public, workers and the environment. Click here for the document you can use to publicize the public comment period on Ban Triclosan petition or email info@beyondpesticides for the word version. EPA published in the Federal Register a petition, filed by 82 public health and environmental groups, to ban the hazardous antimicrobial/antibacterial pesticide triclosan for non-medical use. The chemical is found in products from clothing to soaps. The Federal Register notice (Petition for a Ban on Triclosan, 75 FR 76461, December 8, 2010) announces a public comment period until February 7, 2011 on the need to ban triclosan under numerous federal statutes from pesticides, clean water, safe drinking water, to endangered species. SUGGESTED ACTION AND SAMPLE PUBLIC COMMENT: Please send […]

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10
Dec

EPA Publishes Petition to Ban Triclosan, Opens Public Comment

(Beyond Pesticides, December 10, 2010) Announcing a 60-day public comment period, the U.S. Environmental Protection Agency (EPA) yesterday published in the Federal Register a petition filed by 82 public health and environmental groups, led by Beyond Pesticides and Food and Water Watch, to ban the controversial antimicrobial/antibacterial pesticide triclosan, found in products from clothing to soaps, for non-medical use. The Federal Register notice (Petition for a Ban on Triclosan, 75 FR 76461, December 8, 2010) invites the public to comment until February 7, 2011 on the need to ban triclosan under numerous federal statutes. The petition, filed on January 14, 2010, identifies pervasive and widespread use of triclosan and a failure of EPA to: (i) address the impacts posed by triclosan’s degradation products on human health and the environment, (ii) conduct separate assessment for triclosan residues in contaminated drinking water and food, and (iii) evaluate concerns related to antibacterial resistance and endocrine disruption. The petition cites violations of numerous environmental statutes, including laws on pesticide registration, the Clean Water Act, Safe Drinking Water Act, and Endangered Species Act. It also documents that triclosan is no more effective than regular soap and water in removing germs and therefore creates an unnecessary […]

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30
Nov

Triclosan Linked to Increased Risk of Allergies, BPA Linked to Immune Problems

(Beyond Pesticides, November 30, 2010) Young people who are overexposed to antibacterial soaps containing triclosan may suffer more allergies, and exposure to higher levels of Bisphenol A among adults may negatively influence the immune system, a new University of Michigan School of Public Health study finds. Triclosan is a chemical compound widely used in products such as antibacterial soaps, toothpaste, pens, diaper bags and medical devices. Bisphenol A (BPA) is found in many plastics and, for example, as a protective lining in food cans. Both of these chemicals are in a class of environmental toxicants called endocrine-disrupting compounds (EDCs), which are believed to negatively impact human health by mimicking or affecting hormones. Using data from the 2003-2006 National Health and Nutrition Examination Survey (NHANES), U-M researchers compared urinary BPA and triclosan with cytomegalovirus (CMV) antibody levels and diagnosis of allergies or hay fever in a sample of U.S. adults and children over age 6. Allergy and hay fever diagnosis and CMV antibodies were used as two separate markers of immune alterations. The study, “The Impact of Bisphenol A and Triclosan on Immune Parameters in the US Population, NHANES 2003-2006,” was published online November 30, 2010 in the journal Environmental Health […]

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19
Nov

Congresswoman Urges FDA to Ban Triclosan

(Beyond Pesticides, November 19, 2010) House Rules Committee Chairwoman Louise M. Slaughter and two colleagues asked the U.S. Food and Drug Administration (FDA) to ban triclosan due to the hazards that this chemical poses, including antibiotic resistance and potentially leading to higher health care costs, citing both Beyond Pesticides and Food and Water Watch along with other environmental groups. Rep. Slaughter, joined by Reps. Raul Grijalva and Betty McCollum, delivered the letter Tuesday, November 16, urging FDA to take immediate steps to stop the unnecessary exposure to this chemical in the U.S. Rep. Slaughter concludes that “triclosan is clearly a threat to our health.” Among the reasons for her conclusion, she lists: Ӣ The presence of triclosan in the human body and its impact on our “body burden;” Ӣ Bacterial resistance to antibiotic medications and antibacterial cleaners; Ӣ The potential for endocrine disruption as a result of triclosan bioaccumulation in the body; Ӣ Wastewater contamination; Ӣ The threat of destroying ecological balance, and; Ӣ The fact that triclosan is no more effective than soap and water. The scientific literature has extensivelly linked the non-medical uses of triclosan to many health and environmental hazards. Triclosan is an endocrine disruptor and has […]

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15
Nov

Triclosan in Waterways Harmful to Important Microorganisms

(Beyond Pesticides, November 15, 2010) A new study suggests the widespread use of the antimicrobial triclosan may be inhibiting the aquatic bacteria and algae needed for a healthy ecosystem. Triclosan is an antibacterial compound found in a wide variety of household products including soaps, cosmetics, toothpaste, flooring, textiles, and even children’s toys. According to the study entitled “Triclosan persistence through wastewater treatment plants and its potential toxic effects on river biofilms,” when triclosan finds its way into rivers and streams it can inhibit photosynthesis in algae and kill bacteria. The study examined a group of algae known as diatoms. Through photosynthesis, diatoms produce food as well as oxygen needed for other organisms. Diatoms produce an estimated 80 percent of the oxygen in our atmosphere making them essential to life on earth. When introduced to the market in 1972, triclosan was confined to hospital and health care settings. Aided by the false public perception that antibacterial products are best to protect and safeguard against potential harmful bacteria, triclosan has since exploded in the marketplace in hundreds of consumer products ranging from antibacterial soaps, deodorants, toothpastes, cosmetics, fabrics, toys, and other household and personal care products. Due to the prevalence of this […]

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10
Nov

Triclosan Exposure Raises Pregnancy Concerns

(Beyond Pesticides, November 10, 2010) A University of Florida, Gainesville study reports that the antibacterial pesticide triclosan, found in toothpaste, soaps, toys and clothing, interferes with estrogen metabolism in women and can disrupt a vital enzyme during pregnancy. These recent findings raise concerns about triclosan’s possible effects on fetal growth and development. This study is just one of an emerging body of science which supports triclosan as an endocrine disruptor and should be eliminated from consumer products. The study, which was published in the November print issue of the journal Environment International, examines the effect of triclosan on a placental enzyme, called estrogen sulfotransferase. Triclosan is known to inhibit sulfonation of phenolic xenobiotics and is structurally related to other known inhibitors of estrogen sulfotransferase, such as polychlorobiphenylols (PCBs). During pregnancy, the placenta is an important source of estrogen, which is needed for normal fetal development and successful parturition (childbirth), and estrogen sulfotransferase is thought to play an important role in regulation of estrogen availability. Estrogen is a key hormone during pregnancy and controls the way a baby develops many key organs like the brain. Triclosan was found to be a very potent inhibitor of both estradiol and estrone sulfonation. The […]

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29
Sep

Antibacterial Soap Hit with Class Action Suit for False Anti-Germ Claims

(Beyond Pesticides, September 29, 2010) A class action complaint claims Dial Corp. defrauds consumers about its Dial Complete soap by falsely claiming that it ‘kills 99.99% of germs,’ when in fact the product provides no benefit over washing with regular soap and water. The suit states that Dial Corp.’s claims are deceptive and misleading, designed solely to cause consumers to buy the product. Dial Complete contains triclosan, a registered pesticide, which is linked to numerous adverse effects including hormone disruption and water contamination. The suit wants Dial Corp. enjoined from continuing its deceptive advertising, disgorgement and damages for consumer fraud and deceptive business practices. The plaintiff, David Walls, in his suit states there are no reliable studies that show Dial Complete lives up to these claims. His complaint states: “Through its extensive and comprehensive nationwide marketing campaign, defendant claims that Dial Complete ‘kills 99.99% of germs’, is the ‘#1 Doctor Recommended’ brand of antibacterial liquid hand wash and ‘kills more germs than any other liquid hand soap’, when in actuality, it does not, a fact which Dial knew and purposely misrepresented and failed to disclose to consumers. To this day, Dial has taken no meaningful steps to clear up consumer […]

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24
Sep

Send Your Comments to EPA as Scientists Examine the Fate of Silver Nanoparticle Waste

(Beyond Pesticides, September 24, 2010) Researchers from Virginia Tech discovered, for the first time, a way to detect nanosilver particles in the environment, finding that the particles leaching from consumer products can transform into silver sulfide in sewer sludge. Despite their widespread use, scientists still know very little about how nanomaterials move from consumer manufactured products into the environment and what impact they might have. These findings provide new information about the life cycle of silver nanoparticles, which are used in a number of consumer products as antimicrobial agents, including cosmetics, sunscreens, sporting goods, clothing, electronics, baby and infant products, food, and food packaging. Previous studies have shown that the particles, which are between one and 100 nanometers in size and smaller than many viruses, can enter the environment through wastewater, where they can accumulate in biosolids at wastewater treatment plants. These biosolids, also known as sewage sludge, are often sold to consumers as fertilizer, despite the fact that they can contain toxic contaminants, including another antibacterial, triclosan, which was recently found to persist in the environment. Nanosized particles can be released from impregnated materials via washing or or as a result of sweating, posing unknown adverse effects to humans […]

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23
Sep

Triclosan Persists at Low-Levels in the Environment for Long Periods of Time

(Beyond Pesticides, September 23, 2010) A study by U.S. Department of Agriculture (USDA) scientists and cooperators provides new details about how fertilizing soils with biosolids also introduces triclosan, an antibacterial agent in soaps and other cleaning supplies, into the environment. Results show that triclosan in biosolids is only slowly degraded and persists at low levels in the environment for long periods of time. Biosolids are illegal for use in organic agriculture. For this study, entitled “Fate of triclosan in agricultural soils after biosolid applications” and published in Chemosphere, Agricultural Research Service (ARS), chemist Clifford Rice, of the ARS Environmental Management and Byproduct Utilization Laboratory in Beltsville, Md., and his partners determined that triclosan levels in Class B biosolids from a Mid-Atlantic wastewater treatment plant averaged around 15.5 milligrams per kilogram. They collected surface soil samples from 26 farms in northern Virginia, mostly from pastures. Some fields had never been amended with biosolids and others had been amended with one to four applications of biosolids within the previous 9 months to 13 years. Most of the biosolid amendments came from the wastewater treatment plant in the study. Generally, conventional chemical-intensive farmers add “Class B” biosolids, also known as treated wastewater solids, […]

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03
Sep

Nanosilver Particles Can Stop Sperm Cells from Growing

(Beyond Pesticides, September 3, 2010) New research shows that silver nanomaterials, which are used in a number of consumer products as antimicrobial agents, can interrupt important cell signaling within male reproductive sperm cells, causing them to stop growing. In previous studies, scientists reported how smaller-sized silver nanoparticles — in the 10 – 25 nanometer range — decrease the growth of male stem cells when they are exposed at concentrations greater than 10 micrograms per milliliter (μg/ml). This new study, on the other hand, is the first to identify how the silver nanoparticles stop the sperm stem cells from growing, with the biggest effects from the smallest-sized nanoparticles tested. Like many other studies on the effects of nanotechnology, this study raises important questions about the potential hazards to human health due to the prolific use of silver nanoparticles in the market. Researchers tested the effects of different sizes, concentrations and coatings of silver nanoparticles on cell growth of mouse sperm cells. They compared silver nanoparticles coated with either hydrocarbons — at 15 nm, 25 nm and 80 nm diameters — or sugars — at 10 nm, 25 – 30 nm and 80 nm diameter. Exposure to the smaller sized particles led […]

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13
Aug

Antimicrobial Nanoparticles in Soil Can Harm Plants

(Beyond Pesticides, August 13, 2010) A new study finds that silver nanoparticles, which are used in consumer products and in hospitals for their antimicrobial properties, can harm plant life when it enters into the natural environment. Where silver nanoparticles are present in the soil, plant species are reduced by 22 percent, with an additional 20 percent reduction of microbial biomass, as compared to those plants without the presence of nanoparticles. Researchers applied biosolids with silver nanoparticles into the soil of plants growing in intermediate sized rubber tubs, using a concentration within the range that the U.S. Environmental Protection Agency (EPA) has reported finding in biosolids from a recent survey. “There have been a lot of lab studies looking at silver nanoparticles showing that they are highly toxic to bacteria, fungi, other microorganisms,” explained Ben Colman, PhD to Scientific American. Dr. Coleman is a postdoctoral researcher at Duke University who led the study. “Most of these studies have been conducted in very simple lab settings, [with] one species of bacteria””often the “lab rat” of the bacteria world, E [scherichia]. coli ””[in] a test tube with very simple media and nanoparticles. So we wanted to move beyond this because it’s really hard […]

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