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Frequently Asked Questions

How do I check for mycoplasma contamination in hES cells?

ICE Human Embryonic Stem Cell Core Facility
The core has established the ELISA-based mycoplasma test with high specificity. You can harvest the supernatant of cell culture and send to us. We will report to you within 3 working days.
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Back to top How are cells screened for mycoplasma contamination?

ATCC: Frequently Asked Questions
Answer: Cell lines are screened for mycoplasma contamination by direct cultivation and by indirect methods. For example, the fluorochrome Hoechst DNA stain will bind to the DNA of mycoplasma and the organisms can be detected easily when examined using a microscope equipped with appropriate fluorescence optics. The direct culture method requiring both broth and agar will permit isolation of cultivable strains as apparent by appearance of characteristic mycoplasma colonies on the agar medium.
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Back to top Can a cell line be cured of mycoplasma contamination?

ATCC: Frequently Asked Questions
Answer: Yes, several lines in our collection have been cured of mycoplasma (e.g., ATCC CCL-229, ATCC HB-175). However, this process is time consuming and does not always work; discarding the culture and starting over is always the preferred method. As with other microbial infections, one should first identify the contaminant and select a suitable antibiotic, preferably by testing the contaminating mycoplasma for its antibiotic sensitivity.
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What is mycoplasma?

RMCA: Rat FAQ
Mycoplasma pulmonis is an organism which all of our rats in the pet population carry. Stress or other illness can make your rat break with an active infection that can lead to pneumonia if left untreated. There is no cure for mycoplasma, but it can be controlled with antibiotics until the very advanced stages of the disease. It is the main cause of rat respiratory illness.
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What types of human embryonic stem (hES) cells are involved?

ICE Human Embryonic Stem Cell Core Facility
This core will start with classic hES cell lines derived from the blastocyst stage of human embryos, developed from surplus embryos from in vitro fertilization procedures. Our core intends to support research using both NIH-approved hES cells (derivation occurred prior to August 9, 2001) and subsequently derived hES cell lines. It is often that hES cells are also abbreviated as hESCs.
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I want to express my gene of interest in hES cells stably. I heard it is not easy. Can you help us?

ICE Human Embryonic Stem Cell Core Facility
Although plasmid-based stable transfection can be achieved at least in some hES cell lines, it is not efficient (one out of 100,000 colony-forming hES cells). We normally use lentiviral vectors to stably express a transgene (cDNA) or small-hair (sh) RNA in hES cells. We will provide the backbone lentivector and cloning strategy for your project. With permission of the original hES cell lines provider, we can also provide H1 and H9 hES cell lines that stably express GFP. Ref.
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Is this contamination dangerous?

Contact Castleberry's Brands
It can be. We want to be proactive to ensure the safety of our products and the health of our loyal consumers. Do not use these products even if they do not look or smell spoiled. Please dispose of them by double bagging in plastic bags that are tightly closed before being placed in a trash receptacle for non-recyclable trash outside of the home, according to the Food and Drug Administration.
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What is Cross Contamination?

Frequently Asked Questions
Cross Contamination occurs when harmful bacteria are spread from certain types of raw food to cooked / ready-to-eat foods. Food such as raw poultry, raw meat and unwashed root vegetables may be contaminated with harmful bacteria. These bacteria can be spread to cooked / ready-to-eat foods if appropriate food handling practices are not followed.
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How do you protect my baby's stem cells against potential contamination from other samples?

Cord Blood Bank - Frequently Asked Questions
Each client sample is suspended in vapor-phase cryogenic isolation, which protects your family's cells and eliminates the risk of cross-contamination from other samples that can occur in liquid phase storage.
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Game Programming How do I check cells to see which are empty or full?

Classroom Jeopardy Questions
If you have Classroom Jeopardy! Link, you can use it to check for empty cells.If the game you want to check is a Classroom Jeopardy! Game file, open the game in Classroom Jeopardy! Editor. Be sure to check both the SJ and DJ rounds.If the game you want to check is on a cartridge, do the following: In Classroom Jeopardy! Editor, select the Cartridge Tool from the Toolbar, then select and open the game you wish to check. Be sure to check both the SJ and DJ rounds.
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if inuyasha wants to become a full demon why doesnt he just get rid of hes sword?

Inuyasha Frequently Asked Question FAQ
Does Kikyo ever notice that Inuyasha has the necklace Kagome controls him with? It's just that it's been bothering me for a while.
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Back to top My viral culture has been contaminated with mycoplasma. Can it be saved?

ATCC: Frequently Asked Questions
Answer: ATCC recommends that viral cultures contaminated with mycoplasma be destroyed. However, if the virus is unique, the user may attempt to cure the contamination. Reagents are available commercially for clearing mycoplasma contamination from some types of viral cultures, such as B-M Cyclin from Roche (Roche Catalog No. 799050).
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What is contamination?

FAQs
Contamination occurs when materials that are not allowed in a recycling container or bin are placed in them. Example: mixing window glass with glass bottles. Contamination often increases the cost of the City's Recycling Program and can also increase the cost to you as a taxpayer.
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Lice Ticks and Mites
Parasites present on the outside of the host organisms, such as ectoparasites or mosquitoes. The presence within or around a dwelling of insects, rodents, vermin or other pests to a degree that is harmful to the dwelling or its occupants
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What is mycoplasma infection?

FAQ Mycoplasma Pneumonia January 9, 2007 3 p.m.
Mycoplasma infection is a respiratory illness caused by a type of bacteria called by Mycoplasma pneumoniae. Usually mycoplasma infection is mild, causing symptoms, such as fever, cough, bronchitis, sore throat, and headache. A common result of mycoplasma infection is a mild form of pneumonia. It is very rare for this bacteria to cause serious illness such as encephalitis or meningitis.
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How is mycoplasma spread?

FAQ Mycoplasma Pneumonia January 9, 2007 3 p.m.
Mycoplasma is spread through contact with droplets from the nose and throat of infected people especially when they cough and sneeze. Transmission is thought to require prolonged close contact with an infected person. The spread of bacteria in communities occurs slowly. The contagious period is probably less than 10 days.
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Who owns the cells?

FAQs [Stem Cell Information]
The stem cell lines remain the property of the individual stem cell providers, as listed on the NIH Stem Cell Registry. Researchers may negotiate a material transfer agreement (MTA) with either the National Stem Cell Bank on behalf of the individual providers, or directly with the cell providers in order to specify their rights and responsibilities concerning resulting data, publications, and potential patents.
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What Are Stem Cells?

Stem Cell FAQs - Bone Marrow Transplant Information at CTCA
Blood cells grow in the same way as other human cells. They are developed in the bone marrow from a parent cell known as a “stem cell.” These stem cells begin to divide and mature until they are fully developed, forming all the different types of blood cells: white blood cells, platelets and red blood cells. Stem cells are usually found inside the bone marrow spaces of large bones, however, they can also travel from one bone to the other by way of the blood system.
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What are fuel cells?

Distributed Energy Program: Frequently Asked Questions
Fuel cells are devices that use a chemical reaction to produce an electric current at very high efficiencies. They are frequently compared to batteries where the chemicals needed for the reactions are stored within the battery itself. Fuel cells differ in that they are connected to a source of fuel, almost always molecular hydrogen.
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What are the sources of contamination?

Frequently Asked Questions - Frequently Asked Questions for ...
Micro-organisms ? serious illnesses can be contracted from water contaminated with certain micro-organisms. Water supplies drawn from farmed land where animals graze or manure is spread are at most risk. Discharges from cesspits or septic tanks are another likely source of contamination. Everyone who drinks water contaminated with micro-organisms such as campylobacter, cryptosporidium giardia or E.
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Is there any risk of cross-contamination between animals?

MIT Canada FAQ (Frequently Asked Questions)
Studies have shown that there is no risk of cross-contamination with the AGRO-JET®. Reports from existing studies are available on this web-site. Simply click on the "Research" button above. Yes, there is an AGRO-JET® for use with all livestock, small & companion animal and poultry, from the day old chick to the seasoned steer. Three models are available for smaller animals (mainly poultry and pets) and others for larger animals including pigs of all sizes, cattle, horses, sheep, etc.
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District of Columbia
Cross contamination is when bacteria are transferred from one object to another. That object could be a food or a food surface. For example, blood juices from meats can leak onto vegetables stored below it; thus, the vegetables have now become contaminated. Cross contamination could also occur when a kitchen rag that contains bacteria is used to wipe a kitchen surface which was previously clean and sterile.
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Newhall Remediation Project - Frequently Asked Questions
We know from historical records most areas where dumping occurred. (Download map of dump sites) But because records are not complete, nobody knows just yet exactly where all the landfills and contaminated areas are located. So far, testing has been conducted by five groups to identify landfill locations and types of contamination.
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Why are some pet foods recalled because of cross-contamination? What is cross-contamination?

Pet Food Recall/Contaminated Feed Frequently Asked Questions...
Cross-contamination is the transfer of harmful substances or microorganisms to food by equipment, food-contact surfaces, utensils, hands, or other means. It occurs when these items are not cleaned properly after processing a food that contains a harmful substance and then processing another food.
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Is mycoplasma still a problem on California dairies?

Dairy Cattle Programs, UC Davis Veterinary Medicine Extensio...
A recent retrospective six-year survey (1989-1995) of dairies shipping milk to a central valley California creamery found that between 1.8% and 5.8% of the bulk tank milk samples contained mycoplasma. When only the pathogenic mycoplasma were considered, the yearly percentage ranged from 1.2% to 3.1%. Mycoplasma bovis was the most common isolate and was most likely to be isolated multiple times on a single dairy. Acholeplasma laidlawii, a non-pathogen, was frequently isolated in small numbers.
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Can hematopoietic stem cells form cells other than blood and immune cells?

Graduate School of Biomedical Sciences | Stem Cell Research ...
This is a controversial topic. While some scientists have reported evidence that hematopoietic stem cells can repair cardiac tissue, others have proven otherwise. Another research group reported that the bone marrow contained cells that could repair the liver. Later studies showed that the bone marrow cells did not form liver cells, but rather fused with those cells. Despite these negative results, interesting new information has been gained.
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How many cells should I have?

FAQ General
There is no minimum but a good starting point is 1x10e6 cells/ml with a minimum volume of 300ul. Fewer cells mean longer collection time and potentially more background noise.
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