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In , a silicate is a compound containing an in which one or more central atoms are surrounded by electronegative . This definition is broad enough to include species such as hexafluorosilicate ("fluosilicate"), [SiF6]2-, but the silicate species that are enocuntered most often consist of with as the ligand. Silicate anions, with a negative net electrical charge, must have that charge balanced by other cations to make an electrically neutral compound.

Silica, or , SiO2, is sometimes considered a silicate, although it is the special case with no negative charge and no need for counter-ions. Silica is found in nature as the , and its .

In the vast majority of silicates, including , the Si atom shows coordination by 4 oxygens. In different the tetrahedra show different degrees of : they occur singly, joined together in pairs, in larger finite clusters including rings, in chains, double chains, sheets, and three-dimensional frameworks. The minerals are classified into groups based on these anion structures; a list is given below.

Silicon may adopt coordination by 6 oxygens at very high pressure, as in the dense polymorph of that is found in the of the Earth, and which is also formed by shock during impacts. Lack of space around the oxygen atoms makes this coordination for Si very rare at normal pressure, but it is known in the hexahydroxysilicate anion, [Si(OH)6]2-, as found in the mineral .

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In and , the term silicate is used to denote types of that consists predominantly of silicate minerals. Such rocks include a wide range of , and types. Most of the and are made up of silicate rocks. The same is true of other .

On Earth, a wide variety of silicate minerals occur in an even wider range of combinations as a result of the processes that form and re-work the crust. These processes include partial , , , , and . Living things also contribute to the silicate budget near the Earth's surface. A type of known as construct their , known as tests, from silica. The tests of dead diatoms are a major constituent of .

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, are divided according to structure of their silicate anion into the following groups:

  • Nesosilicates (lone tetrahedron) - [SiO4]4-, eg .
  • Sorosilicates (double tetrahedra) - [Si2O7]6-, eg .
  • Cyclosilicates (rings) - [SinO3n]2n-, eg group.
  • Inosilicates (single chain) - [SinO3n]2n-, eg group.
  • Inosilicates(double chain) - [Si4nO11n]6n-, eg group.
  • Phyllosilicates (sheets) - [Si2nO5n]2n-, eg and .
  • Tectosilicates (3D framework) - [AlxSiyO2(x+y)]x-, eg , , .

Note that tectosilicates can only have additional cations if some of the silicon is replaced by a lower-charge cation such as [[aluminium], to give a negative charge overall. This substitution can also take place in other types of silicate.

Some rare minerals have more than one type of anion coexisting in their crystal structures, or complex-shaped anions that are intermediate between the simple types above.



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Methods and results 285 patients with CAD divided into three age-matched groups: group 1 (G1, n = 95), ACS and one-vessel disease (1-VD); group 2 (G2, n = 95), ACS and 2,3-VD; group 3 (G3, n = 95), chronic CS. Control group (C, n = 95) was composed of patients with suspected CAD who were found to have entirely normal coronary arteries by angiography. Gensini's score used to assess extent of CAD. ED as any value < 26 according to the International Index of Erectile Function (IIEF). ED prevalence was lower in G1 vs. G3 (22 vs. 65%, P < .0001) as a result of less atherosclerotic burden as expressed by Gensini's score [2 (0-6) vs. 40 (19-68), P = 0.0001]. Controls had ED rate values similar to G1 (24%). Group 2 ED rate, IIEF, and Gensini's scores were significantly different from G1 [55%, P < 0.0001; 24 (17-29), P = 0.0001; 21 (12.5-32), P < 0.0001] and similar to G3 suggesting that despite similar clinical presentation, ED in ACS differs according to the extent of CAD. No significant difference between groups was found in the number and type of conventional risk factors. Treatment with beta-blockers was more frequent in G3 vs. G1 and G2. In G3 patients who had ED, onset of sexual dysfunction occurred before CAD onset in 93%, with a mean time interval of 24 [12-36] months. In logistic regression analysis, age (OR=1.1; 95% confidence interval (CI), 1.05-1.16; P = < 0.0001), multi-vessel vs. single-vessel (OR=2.53; 95% CI, 1.43-4.51; P = 0.0002), and CCS vs. ACS (OR=2.32; 95% CI, 1.22-4.41; P = 0.01) were independent predictors of ED. A useful and simple way to distinguish between physiological and psychological impotence is to determine whether the patient ever has an erection. If never, the problem is likely to be physiological; if sometimes (however rarely), it is more likely to be psychological. Patient history A diagnosis of erectile dysfunction is made in men who have repeated inability to achieve and/or maintain an erection for satisfactory sexual performance for at least 3 months. Candid communication between the patient and the doctor is important in establishing the diagnosis of erectile dysfunction, assessing its severity, and determining the cause. During patient interviews, doctors try to answer the following questions: Precautions "There are several reasons ophthalmologists need to be acquainted with the pharmacologic profiles of PDE5 inhibitors and their potential side effects," the authors wrote "The frequency of erectile dysfunction, which is a form of peripheral vascular disease that impairs men's abilities to achieve and maintain an erection, increases dramatically with age and in the presence of cardiovascular risk factors. Therefore, many men who take PDE5 inhibitors to treat their erectile dysfunction will also be followed up by ophthalmologists for ocular disorders such as diabetic retinopathy, macular degeneration and ocular vascular disease." to implant a device that can cause the penis to become erect Vasoactive drugs may also be injected intracavernosally. Such therapy represents an important second-line therapy for erectile dysfunction. It is the most effective pharmacologic treatment but has a high dropout rate because of the associated pain and apprehension involved. Phentolamine is an -blocker that was used in initial studies; its efficacy is poor, but it may be used in combination with other agents. Papaverine is a nonspecific PDE inhibitor and was the first effective intracavernosal therapy for erectile dysfunction. Currently, intracavernosal alprostadil therapy is preferred; it is more effective than other agents and produces fewer side effects. In a comparison study comparing alprostadil, a papaverine–phentolamine combination and papaverine alone, rates of success (ability to achieve and maintain an erection) of 72%, 61% and 31% were reported respectively.54 No patients in the alprostadil group experienced priapism, as compared with 2% and 4% of patients in the combination therapy and papaverine-only groups respectively. On the other hand, patients who used alprostadil were the only ones to report penile pain. For patients who do not respond to or do not tolerate alprostadil monotherapy, a triple mixture of papaverine, phentolamine and alprostadil may be prescribed. Such combination therapy has been shown to be more effective and, because of a lower dose of alprostadil, results in less pain.62 Complications of intracavernosal injections include pain, priapism and fibrotic changes at injection sites. Diseases (e.g., diabetes, kidney disease, alcoholism, atherosclerosis) account for as many as 70% of chronic ED cases and psychological factors (e.g., stress, anxiety, depression) may account for 10–20% of cases. Between 35 and 50% of men with diabetes experience ED. Erectile Dysfunction: Diagnosing Erectile Dysfunction No reports on long-term use Buy Online It was useful. I’d been hearing things about NASDAQ and a bomb threat but I quickly learned this seemed to be a suspicious van parked near Times Square. Probably nothing at all. Erectile dysfunction was associated with a four-fold increased risk of multi-vessel disease as opposed to single-vessel disease. Despite the difference in prevalence between men with one- and two-vessel disease, these men had similar symptoms. buy cialis WEDNESDAY, Oct. 29 (HealthDay News) -- Cialis (tadalafil), a drug used to treat erectile dysfunction, appears effective in treating pulmonary hypertension, researchers report. What are vacuum devices? Duplex ultrasound is used to evaluate blood flow, venous leak, signs of atherosclerosis, and scarring or calcification of erectile tissue. Injecting prostaglandin, a hormone-like stimulator produced in the body, induces erection. Ultrasound is then used to see vascular dilation and measure penile blood pressure. Measurements are compared to those taken when the penis is flaccid. Erectile dysfunction is characterized by the inability to maintain erection. Normal erections during sleep and in the early morning suggest a psychogenic cause, while loss of these erections may signify underlying disease, often cardiovascular in origin. Other things leading to erectile dysfunction are diabetes mellitus (causing neuropathy) or hypogonadism (decreased testosterone levels due to disease affecting the testicles or the pituitary gland).

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