the cause of neural tube defects (ntds) is multifactorial and in this case folic acid has an important role. since the neural tube is closed during 21-28 days of pregnancy, most of women are not informed about their pregnancy at this time, and as a result the golden time of folic acid consumption is missed. the aim of this study was evaluating the performance of pregnant women attending to tehr...

a brass vortex tube (vt) with interchangeable parts is used to determine the optimum cold end orifice diameter, main tube length and diameter. experiments were carried out to study the effects of operating pressure as well. it is shown that there is an optimum value for cold end orifice diameter, which is equal to 4mm and there is an optimum value for cold and hot exit temperature difference at...

tomato is an important vegetable crop in iran. recently symptoms associated with phytoplasma disease were observed in tomato cultivars in karaj vicinity. the phytoplasmas were detected and characterized using single-tube nested pcr and rflp. the universal primer pairs amplified the target dna with expected sizes from symptomatic samples in direct pcr and single-tube nested pcr. the patterns of ...

background: today, early diagnosis of upper gastrointestinal (gi) tract malignancies and their surgical resection is becoming more feasible. one of the important side effects in upper gi tract malignancies is malnutrition which has direct relationship with postoperative complications. nonetheless, there is no easy regimen of nutrition for these patients especially for the first week after opera...

In this paper the dynamic response of tube-in-tube systems for tall building structures is investigated. Inner and outer tubes are modeled using equivalent continuous orthotropic membranes; in which, each tube is individually modeled by a cantilever box beam. By applying the compatibility conditions on deformation of the two tubes, the governing dynamic equations of the tube-in-tube structure a...

Distortion and deformation of tubes during machining operations are very important. In this study, a tube used in magnetic drum separator under concentrated load (machining load) is considered. Using finite element simulation, deformities and their dependence on parameters such as the thickness of the tube and the place of concentrated force are observed and predicted. To compare and confirm th...

retinoic acid is one of the derivatives of vitamin A.it is used for treatment of dermatitis,but it has different teratogenic effects on developing organs depending on the different stages of embryonic life.neural  tube is made of two different parts:primary neural tube originated from embryo germinal layer and and secondary neural tube originated from tail bud.the persent study was designed to ...

Single staggered is a design development of normal wire and tube heat exchanger that wires are welded with staggered configuration on two sides. Capacity of wire and tube heat exchanger is the ability of the heat exchanger to release heat. The objective of this study is to analyse the effect of wire pitch (pw) on capacity of single staggered wire and tube heat exchanger. The research...

Evaluation of the interaction between a new and the existing underground structures is one of the important problems in urban tunneling. In this work, using FLAC3D, four numerical models of single- and twin-tube tunnels in urban areas are developed, where the horizontal distance between the single- and twin-tube tunnels are varied. The aim is to analyze the effects of the horizontal dista...