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	Why and how do cats purr?(Everyday Mysteries: Fun Science Facts from the Library of Congress)
		Elizabeth Von Muggenthaler has suggested that the purr, with its low frequency vibrations, is a “natural healing mechanism.” Purring may be linked to the strengthening and repairing of bones, relief of pain, and wound healing (See Web link to Felid purr: a healing mechanism).
		What makes the purr distinctive from other cat vocalizations is that it is produced during the entire respiratory cycle (inhaling and exhaling).
		It was once thought that the purr was produced from blood surging through the inferior vena cava, but as research continues it seems that the intrinsic (internal) laryngeal muscles are the likely source for the purr.
	www.loc.gov /rr/scitech/mysteries/catspurr.html (739 words)

	Purr - Wikipedia, the free encyclopedia
		This assumption is based on the observation that cats often (though not always) purr when being stroked by humans, combined with the experience that human children tend to enjoy stroking by their parents and interpret it as a gesture of affection.
		One speculation is that it is a signalling mechanism between mother cat and nursing kittens.
		Female cats are known to purr while giving birth, and this may be to reduce the pain and also assist post-natal healing.
	en.wikipedia.org /wiki/Purr (757 words)

	purr (Site not responding. Last check: 2007-11-06)
		They were blessed with the ability to purr, so they and their descendants would forever be living manifestations of the mesmerizing whir of the spinning wheel.
		Caregivers are sometimes shocked to hear a deep purr resonating from a badly injured or dying cat.
		Perhaps the rhythmic vibration of the purr is as comforting to the cat as it is to its human companions.
	members.aol.com /catz4u/ragdoll/purr.htm (1767 words)

	Home Page
		Purr's Cattery is a family-based cattery established by a mother and daughter team.
		Purr's Cattery is a home-based cattery in Macomb Township, Michigan.
		Purr's Cattery vaccinates all kittens and sends them off to their adoptive homes with a health record and a health guarantee.
	mywebpages.comcast.net /drpurrs/index.htm (350 words)

	Cardinal Laboratories - The Perfect Purr (Site not responding. Last check: 2007-11-06)
		Listen to the steady rhythmic purr of a feline, and before long your own cares and anxieties will be swept away, as you share in your pet's contentment.
		In turn, kittens purr themselves to reassure their mother that they are doing well.
		As adults, cats often purr when they are getting fed or brushed, or other good things are happening to them.
	www.crazypet.com /cdfunstuff/perfectpurr.htm (248 words)

	Fauna Communications Cat's Purr
		For the purr to exist in different cat species over time, geographical isolation etc. there would likely have to be something very important (survival mechanism) about the purr.
		After analysis of the data, we discovered that cat purrs create frequencies that fall directly in the range that is anabolic for bone growth.
		Purr frequencies correspond to vibrational/electrical frequencies used in treatment for bone growth/fractures, pain, edema, muscle growth/strain, joint flexibility, dyspnea, and wounds.
	www.animalvoice.com /catpur.htm (3794 words)

	Purr information - Search.com
		Felines are either able to purr or to roar, one exception being the tiger which can purr but only in one direction, as well as being able to roar.
		This assumption is based on the observation that cats often (though not always) purr when being stroked by humans, combined with the experience that human children tend to enjoy stroking by their parents and interpret it as a gesture of affection.
		Female cats are known to purr while giving birth, and this may be to reduce the pain and also assist post-natal healing.
	domainhelp.search.com /reference/Purr (720 words)

	Earthcode: The Cat's Purr and Other Sounds that Heal
		The type of frequencies that are found in the cat's purr are good for healing muscle, tendon, and ligament injuries, as well as for muscle strengthening and toning.
		The purr seems to be a constant strengthener and toner for the muscles.
		The purr is nearly the same across species: The ocelot, chervil, and domestic cat all create an identical sound.
	paulapeterson.com /CatsPurr.html (3219 words)

	Why Cats Purr (Site not responding. Last check: 2007-11-06)
		A kitten is able to purr by the second day of life, and although he can’t meow and nurse at the same time, he can purr and nurse.
		Some cats purr to indicate contentment or pleasure, but badly frightened cats purr, severely ill cats purr, and female cats purr while delivering their kittens.
		Older cats may purr when they play or approach other cats, signalling that they are friendly and want to come closer.
	members.tripod.com /nitiram-ivil/id44.html (449 words)

	A Transcriptional Activator, Homologous to the Bacillus subtilis PurR Repressor, Is Required for Expression of Purine ...
		of the gene or PurR is a repressor and the insertion of the transposon
		Subsequently, the intact purR gene was amplified from the chromosome of MG1363 with primers MKP90 and MKP104 (Fig.
		Autoregulation of PurR repressor synthesis and involvement of purR in the regulation of purB, purC, purL, purMN and guaBA expression in Escherichia coli.
	jb.asm.org /cgi/content/full/180/15/3907 (5680 words)

	The Reasons Why Cats Purr - PetPlace.com (Site not responding. Last check: 2007-11-06)
		A kitten is able to purr by the second day of life, and although he can't meow and nurse at the same time, he can purr and nurse.
		Some cats purr to indicate contentment or pleasure, but badly frightened cats purr, severely ill cats purr, and female cats purr while delivering their kittens.
		Older cats may purr when they play or approach other cats, signaling that they are friendly and want to come closer.
	www.petplace.com /cats/the-reasons-why-cats-purr/page1.aspx (569 words)

	The Perplexing Purr
		Most of the time, purring is a cat’s way of expressing utter contentment and joy, but they will purr to comfort themselves when sick, in pain or labor, and even when dying.
		Purring can open the cat’s air passages to help her breathe easier, which may be why a cat purrs when she is very sick.
		The cats were rewarded with the ability to purr, which imitated the whirring sound of a spinning wheel.
	www.wegmans.com /news/pet/columns/040905.asp?sd=pet&dt=purr (352 words)

	Best Friends Animal Society - Best Friends Magazine - Purr-fect Harmony
		Considering all the fur that flew as the cats vied for their 15 minutes of fame (and many of the cats hogged double that amount on the 70-minute release), is it any wonder it took a year to edit and produce the final mix?
		On others, the purrs serve as staccato percussive instruments or a continuous ostinato bass line.
		To audition the cats (there were many more than the chosen 13), Moran got down on all fours with a microphone to test the pitch, tone, melody and therapeutic properties of each cat's "instrument." Some cats couldn't be convinced to go anywhere near the untra-sensitive microphone equipment.
	www.bestfriends.org /allthegoodnews/magazine/0706purfect.cfm (973 words)

	The Power of the Purr
		It serves as a signal to the nursing mother cat that all is well with her babies and that the milk supply is reaching its destination.
		She, in turn, purrs, letting the kittens know that she too is in a relaxed and cooperative mood.
		Unlike our small domestic cats that purr with both inward and outward breaths (with their mouths firmly shut), their large cousins--the lions and tigers, can only sputter out a friendly "one-way purr" when greeting friends.
	www.catsinternational.org /articles/natural_cat_behavior/power_of_the_purr.html (194 words)

	Why Do Cats Purr? - PetPlace.com (Site not responding. Last check: 2007-11-06)
		Some cats purr to indicate contentment or pleasure, but badly frightened cats and severely ill cats also purr, and so do females while they are delivering their kittens.
		It is not uncommon for cats to purr when they are close to death.
		Animal behaviorists believe that when cats purr under stressful circumstances, they are reassuring or comforting themselves, much as humans may sing to themselves or hum when they are nervous.
	www.petplace.com /cats/why-do-cats-purr/page1.aspx (720 words)

	Purr Harvard Review - Find Articles
		In one of the first poems in Purr, the speaker asks--of the entire world, it seems--"Is this enough?" While the question is rhetorical, the speaker answers in the voice one hears throughout the collection: oblique, sardonic, insistently literary, and tempered with real pain.
		While intent on breaking narrative frames and expectations, Purr still manages to suggest a narrative arc, as Samyn goes in search of an answer to her question.
		Purr reads like an extension of, rather than a significant advance over, the poetic project of Samyn's previous volume, Inside the Yellow Dress, but this is a minor misgiving.
	www.findarticles.com /p/articles/mi_m0RWZ/is_29/ai_n15964056 (730 words)

	Why do cats purr?
		Boosie (rainbow bridge) would seldom purr, and even then you had to be in a quiet room with your ear to her chest to hear it.
		Cookie is about a year and a half old now, and I have yet to hear her purr, although she is a very contented little girl.
		I heard when cats purrs that they are happy, ill or scared but I don't unerstand why they purr when they are ill. Purrs are unkown.
	www.petoftheday.com /talk/showthread.php?t=4799 (1212 words)

	Welcome To Project Purr!
		Project Purr, a local grassroots all-volunteer 501(c)(3) nonprofit feral cat advocate organization, was founded in 1987 to help feral cats, curb pet overpopulation, provide education on Trap/Neuter/Return (TNR) for managed feral cat colonies and raise money to fund a low cost spay/neuter program for feral cats/kittens of Santa Cruz County.
		Project Purr is an all volunteer 501(c)(3) nonprofit feral cat advocate organization dedicated to humanely decreasing the feral cat population and controlling the spread of disease in Santa Cruz county, California.
		Project Purr administers a low-cost, feral cat spay/neuter program which is available to the public, with surgeries performed solely at Adobe Animal Hospital, and largely funded by Project Purr.
	www.projectpurr.org (1040 words)

	Scientific American: Ask the Experts: Biology: Why do cats purr?
		Although we assume that a cat’s purr is an expression of pleasure or is a means of communication with its young, perhaps the reasons for purring can be deciphered from the more stressful moments in a cat’s life.
		Cats purr during both inhalation and exhalation with a consistent pattern and frequency between 25 and 150 Hertz.
		Although it is tempting to state that cats purr because they are happy, it is more plausible that cat purring is a means of communication and a potential source of self-healing.
	www.sciam.com /askexpert_question.cfm?chanID=sa005&articleID=0005CB0D-82FC-1E31-82FC809EC5880000 (621 words)

	Bark'n Purr FRR (Site not responding. Last check: 2007-11-06)
		The Bark'n Purr FRR formula is TWICE OVEN-BAKED under carefully controlled conditions and temperatures, resulting in better nutrition, palatability and digestibility for your pet.
		The Bark'n Purr FRR Chicken, Rice, Lamb and Wheat formula is nutritionally complete and balanced for all stages of your pet's life according to AAFCO Nutrient Profiles for Dog Foods.
		The Bark'n Purr FRR All Natural Premium Dog food recipe is specially structured to help your dog's body holistically heal itself through proper nutrition.
	www.barknpurr.com /frr/kibble_puppy_adult.html (761 words)

	The Purr Scouts Mewsletter
		While this is furry sad, I ask all Purr Scouts to be supportive of CLAW and our Queen Midnight until the furry last day.
		To become a Purr Scouts Leader, you must have achieved the rank of Master Purr Scout, have made a significant contribution to the Purr Scouts' program and be approved by the Purr Scouts' Council.
		The tiny charming Bellbirds live a short walk away and when life gets too stressful I often stroll down to the resever and lay back and let their melodic song sooth and refresh me, it is a wonderful tune to medititate too.
	kittytribe.tripod.com /PSmewsletter3.htm (1839 words)

	Cat's Purr CD -- How to Heal and Relax with Chet Day's NeuroImagery Sound Technology (Site not responding. Last check: 2007-11-06)
		Although it perked my interest, I wasn’t compelled to do any further research at the time, probably because I didn’t have any friends or family members who had cats, and my life circumstances were such that it was impractical to have one myself.
		A cat’s purr produces a wide range of sound frequencies, some of which can stimulate growth and repair of bones and muscles, and others which can provide a pain-relieving effect.
		Seriously, when you hear Lucy's purr on this CD, you'll almost believe she's lying on your chest, a furry bundle of contentment and happiness who wants to share her good vibes with you.
	chetday.com /catspurrcd.shtml (2660 words)

	When do cats purr?
		My cat Jazz purrs when he is being loved....every night when I get home from work he has to be held and petted, and he purrs very loudly.
		My cat will purr after attacking my brother, she lovly to punce on hif feet and then, like I said, will also purr when I'm yelling at her.
		Bo purrs when she is being petted, picked up and cuddled, or when she is being brushed.
	www.petoftheday.com /talk/showthread.php?p=60794 (462 words)

	purr definition - Dictionary - MSN Encarta
		Search for "purr" in all of MSN Encarta
		purring sound: a sound similar to the purr of a cat
		intransitive verb emit purr: to make the characteristic soft low murmuring noise that a cat makes when it seems to be contented
	encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861735790 (178 words)

	Feline Purr
		The inhaled stroke is the louder and rougher, and the exhaled one is smoother and seems to be continous.
		Probably that the kittens learn to purr from their mama, calling the babies to nurse, because when they are very young their senses are very undevelloped, but still they can feel a vibration (purr) from the mother.
		She mentioned that all the big cats purr, and this purr is rather loud.
	www.newton.dep.anl.gov /askasci/zoo00/zoo00113.htm (283 words)

	How Cats Purr \| Why Do Cats Purr? \| Purring Felines
		However, really scared cats purr, sick cats purr and female cats purr while giving birth.
		Some cats even purr when they are close to death.
		Scientists believe that stressed cats purr to reassure or comfort themselves - kinda like when we sing.
	www.kidzworld.com /article/1656-why-cats-purr (166 words)

	purr
		But cats have also been known to purr when they have been injured, are in pain, during labor or when ill. This has led researchers and scientists to believe that there must be more to purring than just simple happiness.
		In studies it was found that cats purr between a frequency of 27 and 44 Hertz (hertz is a measure of sound waves).
		It is known that exposure to frequencies of 20-50 hz helps to strengthen bones and to facilitate bone growth.
	www.geocities.com /sleepy292/purr.html (627 words)

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