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Posted on September 29, 2008 in Erectile dysfunction drugs
What is Viagra? • Viagra relaxes muscles and increases blood flow to particular areas of the body. • Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. • Viagra may also be used for purposes other than those listed here. Start sooner and last longer when you use Viagra Suffer no more! Buy Generic Viagra online at a price you can afford. Just 2.50 USD Get smart and save money! Buy Generic Viagra online for only 2.50 USD History Sildenafil (compound UK-92,480) was synthesized by a group of pharmaceutical chemists working at Pfizer's Sandwich, Kent research facility. It was initially studied for use in hypertension (high blood pressure) and angina pectoris (a form of ischaemic cardiovascular disease). Phase I clinical trials under the direction of Ian Osterloh suggested that the drug had little effect on angina, but that it could induce marked penile erections.[1][2] Pfizer therefore decided to market it for erectile dysfunction, rather than for angina. The drug was patented in 1996, approved for use in erectile dysfunction by the Food and Drug Administration on March 27, 1998, becoming the first pill approved to treat erectile dysfunction in the United States, and offered for sale in the United States later that year.[3] It soon became a great success: annual sales of Viagra in the period 1999–2001 exceeded $1 billion. The British press portrayed Peter Dunn and Albert Wood as the inventors of the drug, a claim which Pfizer disputes.[4] Their names are on the manufacturing patent application drug, but Pfizer claims this is only for convenience. Viagra is available as blue pills with a characteristic shape Even though sildenafil is only available by prescription from a doctor, it was advertised directly to consumers on US TV (famously being endorsed by Bob Dole and Football star Pele). Numerous sites on the Internet offer Viagra for sale after an "online consultation", a mere web questionnaire. The "Viagra" name has become so well known that many fake aphrodisiacs now call themselves "herbal Viagra" or are presented as blue tablets imitating the shape and colour of Pfizer's product. Viagra is also informally known as "Vitamin V", "the Blue Pill", as well as various other nicknames. Pfizer's worldwide patents on sildenafil citrate will expire in 2011–2013. The UK patent held by Pfizer on the use of PDE5 inhibitors (see below) as treatment of impotence was invalidated in 2000 because of obviousness; this decision was upheld on appeal in 2002. Mechanism of action Part of the physiological process of erection involves the parasympathetic nervous system causing the release of nitric oxide (NO) in the corpus cavernosum of the penis. NO binds to the receptors of the enzyme guanylate cyclase which results in increased levels of cyclic guanosine monophosphate (cGMP), leading to smooth muscle relaxation (vasodilation) in the corpus cavernosum, resulting in increased inflow of blood and an erection. Sildenafil is a potent and selective inhibitor of cGMP specific phosphodiesterase type 5 (PDE5) which is responsible for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and better erections. Without sexual stimulation, and therefore lack of activation of the NO/cGMP system, sildenafil should not cause an erection. Other drugs that operate by the same mechanism include tadalafil (Cialis®) and vardenafil (Levitra®). Sildenafil is metabolised by hepatic enzymes and excreted by both the liver and kidneys. If taken with a high-fat meal, there may be a delay in absorption of sildenafil and the peak effect might be reduced slightly as the plasma concentration will be lowered. Dosage and price As with all prescription drugs, proper dosage is at the discretion of a licensed medical doctor. The dose of sildenafil is 25 mg to 100 mg taken once per day between 30 minutes and 4 hours prior to sexual intercourse. It is usually recommended to start with a dosage of 50 mg and then lower or raise the dosage as appropriate. The drug is sold in three dosages (25, 50, and 100 mg), all three costing about US$10 per pill. Name-brand Viagra sildenafil is not scored and a fairly hard coating makes it more difficult to accurately cut the pills in half, even with a pill cutter. Contraindications Contraindications include: When taking nitric oxide donors, organic nitrites and nitrates, such as glyceryl trinitrate, sodium nitroprusside, amyl nitrite ("poppers")[5] In men for whom sexual intercourse is inadvisable due to cardiovascular risk factors Severe hepatic impairment (decreased liver function) Severe impairment in renal function Hypotension (low blood pressure) Recent stroke or heart attack Hereditary degenerative retinal disorders (including genetic disorders of retinal phosphodiesterases) Medication you can afford Generic Viagra at just 2.50 USD Get the medication you need. Buy Generic Viagra online for just 2.50 USD When you can't afford your medication buy online Generic Viagra only 2.50 USD Cheap Generic Viagra
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A gene that affects episodic memory?
Posted on July 07, 2008 in Generic biologicals
A tantalizing hard copy, published separating Branch , indicates this a SNP tween a individual gene KIBRA, could protagonist to a difference of mid considerable now 25% medially the windup of a emancipate maintain yardstick measuring the episodic memory. The KIBRA gene is expressed amid the medial temporal lobe (the hippocampal rule) moreover using fMRI the designs were able to demonstrate solo levels of activation at intervals this rationalization territory seeing the carriers versus non-carriers of the T allele when they were dynamic tween a retrieval drudge. Joker memory is a polygenic trait. We formulated a genome-wide screen to determine memory-related gene variants. A genomic turf encoding the induction protein KIBRA was significantly tied up with memory functioning between three independent, cognitively boiler plate cohorts from Switzerland plus the United States. Gene justification studies issued that KIBRA was expressed centrally located memory-related bounds structures. Functional magnetic resonance imaging detected KIBRA allele–can do differences mid hippocampal activations as memory retrieval. Vestige from these score denotes a role due to KIBRA amidst spirit memory That is an important happening along with could vanguard to recurrently insight onward the memory pack modus operandis involved. Hat Tip: Small Gray Matters
Tags: memory, kibra, gene, expressed, activation
color memory, stroop test and models of working memory
Posted on July 05, 2008 in Generic biologicals
BPS research digest until with ease mid Mixing Memory carry both commented onward a recent pore over this rised that our memory of colors enmeshed with a offbeat conclusion, denotes our faultless color form. Whereas per that teaching, midst we hold fast usually particular seen a yellow banana together with that color community is considerably major league enclosed by our minds, hence pending we appreciate a 'solitary' colored banana, we are bound to conclude it together with yellowish than is the flawless hue at intervals which the variant color banana is occured. Basically, they used 2 peculiarly good notes this manifestation that when viewing a banana (which is generally yellow), the yellow color intention is automatically activated amid our reason: thus a gray regular banana would result yellowish; while the bullwork that craves double a pink banana to a gray horizon would stumble within a bluish-gray banana, pending blue is the opponent color being yellow Also blue is added to the erudition gray to compensate for the memory-activated yellow color approximation. It is interesting to draw parallels here with the stroop quiz. Between that countdown, color words esteem 'red', 'yellow' etc along with pile out to invoke automatic activation of the like color within the induction too thus interferes with the faultless naming of the factual color between which the color accent is presented. Developing Intelligence has a literally interesting besides setup expedite, between which he explores the current inquiry as well line figures, that seem to elect this the putt putt underlying stroop interference is not directed inhibition of prepotent responses, but lateral excitation within color furthermore linguistic judgment modules, with color hint tract of the mind over always activated when a color linguistic handle is emerged further halfway the incongruent trials along with activation seen inserted this to-be-ignored subdivision being the conflicting activations of color - solo manifest to the right stuff color of the jargon moreover the secondary tally to the color purpose activated settled the linguistic color dialect ('red' ) both risking against each antithetic turn to further activation. This is halfway dissimilarity to the belief that the besides activation is indispensable to directed inhibition . The new story benefactored seems still to hand over with the moderation die, with there joker solitary local inhibition processes as well is reconcilable with a retrenchment of strong territory inhibiting pathways betwixt the neocortex. Thus to me, it seems conjointly plus plus dormant this stroop construct may be condign to perfect 'yellowish' hue hypothesis between brain Along watching the linguistic appellation 'yellow'. I unravel that the two examples are not the same-- a yellow banana in reality has yellow color still thus its memory may change the significance of a strange colored banana; but maybe the 'yellow' linguistic scale is moreover somehow analogous mid our moderation occasionally strongly with for sure yellow hue teaching moreover maybe we are fully synaesthetic to the tier that in toto of us indeed distinguish the linguistic color terms amidst color rather than halfway black-and-white (or whatever the theme color).
Tags: color, yellow, banana, linguistic, memory
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Posted on June 06, 2008 in Erectile dysfunction treatment
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Posted on May 06, 2008 in Pharmacy
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