منابع مشابه
Three in a row-how sodium ions cross the channel.
Sodium channels are central to a host of fundamental cellular processes, including sensory perception, pain, and muscle contraction. In order to understand any of these processes in detail, it is necessary to know the atomic structure of the channel proteins both with and without bound sodium ions. In this issue, Naylor et al (2016) present the structure of a bacterial sodium channel tetramer. ...
متن کامل[Perianal papules in a child].
The patient was a 10-year-old boy with no past history of interest, who was seen for a 2½-month history of perianal lesions and daily diurnal and nocturnal encopresis. After the condition developed, the child had become more withdrawn. The lesions had been seen previously in another center, being diagnosed as viral warts. The abdomen was slightly distended, soft, nontender, and dull to percussi...
متن کاملItching Papules in a child; Scabies or Henoch Schonlein Purpura?
Introduction: Henoch schonlein purpura (HSP) is a self-limited systemic disease with multiorgan involvement. While cutaneous involvement may wary, presenting as itching papules is not a common manifestation. In this report we discuss a case of HSP which was presented solely with itching papules; mistaken for scabies. Case presentation: A 7 year old boy presented with itchy palpable papules with...
متن کاملEnumerating Row Arrangements of Three Species
This problem nicely illustrates the use of factorials and has a simple solution, though students often neglect the factor of two in the answer 2(N !)2. This omission can be instructive, as it leads naturally to generalizations of the problem: How does the answer change if there are N men and N − 1 women? What if men outnumber women by 2 or more? What if a sexist photographer insists that the li...
متن کاملOptimal Row-Column Design for Three Treatments
The A-optimality problem is solved for three treatments in a row-column layout. Depending on the numbers of rows and columns, the requirements for optimality can be decidedly counterintuitive: replication numbers need not be as equal as possible, and trace of the information matrix need not be maximal. General rules for comparing 3 × 3 information matrices for their A-behavior are also develope...
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ژورنال
عنوان ژورنال: Western Journal of Medicine
سال: 2001
ISSN: 0093-0415
DOI: 10.1136/ewjm.175.1.10