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如下图所示，两梁中的弹性变形能分别为U11和U12，则两者的关系为()。
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如下图所示桁架，在节点C处沿水平方向受力F作用。各杆的抗拉刚度相等，若结点C的铅垂位移以VL表示；BC杆的轴力以FN表示。则()。
在波长为λ的驻波中两个相邻波节之间的距离是()。
The mid-18th century was predominated by a newly rising literary form--______, which gives
We have to admire Suzanne Somers's persistence. She doesn't give up--even when virtually the entire medical community is lined up against her. Three years ago, Somers wrote a best-selling book called The Sexy Years in which she promoted so-called bioidentical hormones as a more natural alternative to hormones produced by drug companies for menopausal women. Somers, now 60, claimed that these individually prepared doses of estrogen and other hormones, sold via the Internet or by compounding pharmacies, made her look and feel half her age. As the popularity of bioidenticals soared, major medical organizations like the American College of Obstetricians and Gynecologists grew so alarmed that they mounted publicity campaigns to convince Somers's readers that these alternative treatments, which are usually custom made for each patient, haven't been proven safe or more effective than traditional hormone therapy for symptoms like hot flashes.
This month Somers is at it again with her latest book, Ageless. Subtitled The Naked Truth About Bioidentical Hormones, the cover features a coquettish shot of the actress unclothed from the collarbone up. Inside, she calls bioidenticals "the juice of youth" and also promotes the questionable dosage advice of a former actress and "independent researcher" named T.S.. Wiley who thinks menopausal women should have as much estrogen in their bodies as 20-year-olds. Now, even some of the pro-bioidentical doctors Somers quotes in her books are screaming foul. "Many of the claims throughout the book are scientifically unproven and dangerous," three of these doctors assert in a letter sent a few weeks ago to Somers's publisher, Crown.
Somers adamantly defends bet book and bioidenticals. "From a woman's standpoint, this is the first time we've gotten some relief in a non-drug way," she says in an interview with NEWSWEEK. "Doctors are embarrassed that they don't know about this," Somers says. "When doctors don't have an answer, they like to pooh-pooh it."
The word bioidentical is a marketing term, not a scientific one, and it means different things to different people. To most doctors, bioidentical refers to a wide variety of FDA-approved drugs that are virtually identical to the hormones produced by women's ovaries. They come in many forms and doses, some of which have been used for years. Somers uses the term to refer to made-to-order treatments created by compounding pharmacies with dosages usually determined by the results of blood tests every two weeks (the method Somers herself uses), or regular saliva tests, a method most experts say is an unreliable way to measure a women's specific hormone needs. Somers claims that she is so "in touch" with her body's needs that she can "tweak" her hormones even without the benefit of these tests.
Proponents of Somers's program say only hormones prepared specifically for each woman can meet her unique needs. But since the Women's Health Initiative, the FDA has approved many new hormone products, including some in very low doses. While the FDA process isn't perfect, it's certainly better than what consumers get with compounding products: no black box warning about side effects, no package insert, no data on relative safety, no check on advertising claims and no manufacturing oversight.
Somers says these custom-made treatments are natural and not really drugs. That's just not true. Bioidenticals may start out as wild yams or soybeans, but by the time this plant matter has been converted into hormone therapy, it is in fact a drug. All of these products--whether or not they’re approved by the FDA--are chemicals synthesized in a lab. Another thing you should know: there are only a few labs in the world that synthesize these hormones. Everyone--from small compounding pharmacies to big pharmaceutical companies gets their ingredients from the same places,
Somers argues that bioidenticals are safer than FDA-approved
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