abstract   background: irregular working hours, including night work and shift work, have been found to be associated with alteration in various levels of biochemical factors. and some studies have showed association between shift work and blood biochemical disturbances in blood. in this epidemiological study we investigated, whether regular schedule of working hours can minimize the associated...

This paper presents two dimensional sound-proof acoustic metamaterials having tunable multi-band negative effective mass density. The acoustic metamaterial panel was composed of many periodic funnel-shaped cell units into square lattice. Each unit cell operates as multi-band resonators. By tuning unit cell the local reflected acoustic wave was almost out of phase with the incident wave. It lead...

background: elevated serum levels of oxidized low-density lipoprotein (oxldl) have been found in type 2 and in poorly controlled diabetic patients. gestational diabetes mellitus (gdm) has common features with type 2 diabetes. objective: the aim of our study was to evaluate the serum levels of oxldl in women with gdm compared to normal pregnant women. materials and methods: in this cross-section...

The 70 ev positive and negative ion mass spectra of ring-substituted nitrobenzenes were studied. The influence of the substituent group on the fragmentation modes of the molecular ions is discussed. The effect of pressure in the formation of negative ions was also studied. As expected, the ratio of fragment ions to negative molecular ions decreased with increasing pressure in ion source.

purpose: given that weight and body mass index (bmi) are considered as modifiable factors in osteoporosis, the present study aimed to examine the relationship of weight and bmi with bone mineral density (bmd) and bone mineral content (bmc) at the femur and lumbar vertebrae in perimenopausal women. methods: in this descriptive-correlational study, we measured the bone density of the femur and lu...

conclusions the findings indicated that older women with low bmi were at higher risk of low bone mass. body weight, bmi and aging may be important predictors of bmd, but they are not the only factors affecting bone loss. therefore, it is recommended to assess other risk factors with a larger number of patients. results the mean bmd of women older than 50 years compared to those younger than 50 ...