total fertility rate relates to the number of children that a woman bears in the fertility period of her life. fertility function is one of the most important health and population indicators. this indicator affects social, health, economic and cultural factors. this study is an ecological or correlative one. factors affecting total fertility rate in iran in the year 2000 are studied in this pa...

BACKGROUND Head of bed elevation ≥ 30° reduces ventilator-associated pneumonia in mechanically ventilated patients, but adherence is variable and difficult to monitor continuously. Unlike many clinical variables, head of bed elevation is not electronically displayed or monitored with audible alarms. HYPOTHESIS Continuous monitoring of head of bed elevation with audible alerts and visual cues...

BACKGROUND We examined the association between extremely low-frequency magnetic fields (EMF) and the risk of dementia and Alzheimer's disease using all 9,508 individuals from the Study of Dementia in Swedish Twins (HARMONY) with valid occupational and diagnostic data. METHODS Dementia diagnoses were based on telephone screening followed by in-person clinical workup. Main lifetime occupation w...

This article introduces a new DNA sequence compression algorithm which is based on look-up table and LZ77 algorithm. Combined a look-up-table-based pre-coding routine and LZ77 compression routine,this algorithm can approach a compression ratio of 1.9bits /base and even lower.The biggest advantage of this algorithm is fast, small memory occupation and it can easily be implementated.

Secondary household transmission of severe acute respiratory syndrome (SARS) was studied in 114 households involving 417 contacts. The attack rate was low (6.2%). Occupation of the index case was the factor that most influenced household transmission (adjusted hazard ratio for healthcare workers 0.157; 95% confidence interval 0.042 to 0.588).