科學 - 四月 2007

Study design
Thirty healthy subjects (14 men and 16 women) between 20
and 39 y of age were recruited. Subjects were asked to abstain
from consuming tea, tea-related products, vitamins, minerals,
and dietary or herbal supplements throughout the study period.
Heavy tea drinkers and users of hormone therapy or antibiotics
were excluded. All subjects were screened with a complete medical
history and signed the informed consent form.Arandomized
33 crossover design with a 1-wk washout period was used for
the intervention study. The subjects were randomly assigned to 3
different sequences of GT, BT, or GTS at the University of
California, Los Angeles (UCLA), General Clinical Research
Center (GCRC).

30 個健康的主題(14個男人和16名婦女) 在20之間
並且年齡的39 y被招募。 主題被要求棄權
從吃完茶，有關茶的產品，維生素，礦物質中，
以及在整個研究時期期間的飲食或者草本植物的補充。
激素治療或者抗菌素的難消化的茶飲者和用戶
被排除。 全部主題被一次完全的體格檢查篩選
歷史和在明智的應允form.Arandomized上簽字
3 _ 有一個1－wk失敗時期的3種交叉的設計被使用為
干涉研究。

2007-04-03 11:27:28 · 1 個解答 · 發問者 sumin 1 in 化學

醫生會把他的手臂放在胸部上,請問這是...算性騷擾嗎?
那如何防範OR解決的~或可以到哪投訴而不需要表明身份呢~?
粉困擾中~~~拜託幫幫我~~~!!!有經驗者可麻煩提供一下.感謝~~

2007-04-02 21:05:50 · 12 個解答 · 發問者 Anonymous in 其他：科學

Tea preparation
Tea flavanol, theaflavin, and caffeine concentrations were measured
in the tea beverages, which were prepared in the same way as in a previous study that used HPLC analysis (3). For the intervention study, hot BT and GT were prepared by trained staff at theUCLAGCRC. Four bags ofBTor 3 bags ofGTwere added to 426mLboiling water and steeped for 5 min. The number of tea bags was chosen to match the EGCG content. Tea was served immediately with or without sugar or 45 mL milk.

茶準備
茶多酚，theaflavin 和茶鹼集中是 在茶飲料裡測量，在相同裡準備 如同在使用HPLC 分析的一項以前的研究裡的模式 ( 3 ) . 為 干涉研究，訓練的人員準備了熱BT 和GT 在theUCLAGCRC。 4 袋ofBTor 3 袋ofGTwere增加 在426mLboiling 水既沒適合5分使浸濕。 茶的數量 袋被選擇與EGCG 內容相配。 茶被提供 立即有或沒有糖或者45 mL牛奶。

2007-04-02 13:28:37 · 1 個解答 · 發問者 sumin 1 in 化學

Can SO2 decolorize KMnO4 ???why??

Is chlorine water a mixture? what is the observable change with NaCl ?

2007-04-02 06:41:01 · 1 個解答 · 發問者 chun yu 1 in 化學

假設依家有兩舊Zn..
第1個重1g
第2個重2g
佢地react with HCl(aq)..
邊個react得快d.?

2007-04-01 17:43:41 · 1 個解答 · 發問者 KanT 3 in 化學

conc.H2SO4 + NaCl + MnO4 點出 white fume?
conc.H2SO4 + NaBr + MnO4 點出 red fume?
Heat KNO3 出乜
Heat Mg(NO3)2 出乜
唔該寫埋d equation~

2007-04-01 11:07:12 · 2 個解答 · 發問者 Anonymous in 化學

1. Explain the meaning of pH, both in terms of hydrogen ions and hydronium ions.

2. Why do chemists not usually use pH to describe [H3O+] when the pH value would be a negative number?

2007-04-01 09:52:30 · 1 個解答 · 發問者 sl_ye 2 in 化學

簡單的問題 只有固體可以做FLAME TEST嗎 還是液體也可以?

我需要準確的答案 =) 謝謝

2007-04-01 07:37:27 · 2 個解答 · 發問者 ? 2 in 化學

1. Citric acid is an electrolyte
2. When citric acid is dissolved in water, citric acid molecules become mobile.

When the second statement is not the explanation of the first statement?

2007-04-01 07:14:37 · 2 個解答 · 發問者 Saturday 3 in 化學

看過知識+~好像大家都說沒有絕對靜止~但是記得以前學到絕對零度的時候~老師說~東西都不會在動了~因為分子不在運動~那樣子還算不上是絕對靜止媽??~拜託幫我回答一下~想一陣子了~~謝謝摟~

2007-04-01 06:09:20 · 3 個解答 · 發問者 凱方 1 in 其他：科學