慢性毒性试验结果出来之后，如何进行安全性评定？ 答：（1）NOAEL≤人的可能摄入量的50倍者，表示毒性较强，应放弃该受试物用于食品。 （2）50倍＜NOAEL ＜100倍者，经安全性评价后，决定该受试物可否用于食品。 （3） NOAEL ≥ 100倍者，则可考虑允许使用于食品。
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Persisting experience of vertigo is not explained by sub-clinical organic changes. Anxiety seems to be the crucial factor in persisting vertigo.doi:10.1016/j.jpsychires.2004.12.006F. GodemannK. SiefertM. Hantschke-BrüggemannP. NeuR. Seidl...
A first step in this direction is replicating the first prospective group-level study [4]. A second step that awaits empirical substantiation is to investigate whether EWS not only indicate the likelihood of shifts in the severity of symptoms, but also reveal the type of symptoms that will ...
Therefore, PH is not necessary for the diagnosis of PSVD but the proportion of patients with histologically proven PSVD who may progress to clinically overt PH (PH-PSVD) is poorly understood. The new definition of PSVD aims to fill the diagnostic gap left by the old term ‘idiopathic non...
and keys. On the inside, you can squeeze a small tablet between the insert and the bag itself. The insert, by the way, is removable, making it easy to convert into a functional day bag. The leather buckle closures are adjustable in case you need a little extra height to fit your tabl...
【小题】(2) According to the passage,what is NOT true about the surgery undergone by Lynne Fisher? ___ A.It is only a very simple and easy surgery. B.It can bring about some terrible side effects. C.It's possible for one to die of the surgery. D....
When a light beam is incident on the surface, both sur- face reflection and diffraction occur. The light intensity at the zero order position is very intense; however, most of the light comes overlap to produce the rainbow- like spectrum, which is the irides- cence colon 9 49. CONCLUSIONS...
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刘某以信件发出为要约，信件未载明承诺开始日期，仅规定承诺期限为10天，4月20日，刘某将信件投入信箱，邮局将信件加盖4月21日邮戳发出，4月23日，信件送达受要约人向某办公室，向某出差至25日才知悉信件内容。问该承诺期限的起算日期是( )。