objectives: the purpose of this study was to develop and test a new tool for radiographic densitometry by combining periapical films and aluminum step wedge. materials and methods: we reviewed 50 kodak e-speed intraoral films. an aluminum step wedge consisting of 16 steps was constructed. each step was 1mmx3mx10mm. the step wedge was exposed to varying exposure times, ranging from 0.05 second t...

nowadays the surface texturing has been widely recognized as a usable capability to improve the tribological systems. in this paper, ultrasonic assisted turning (uat) isperformed to create the micro textures on the flat faces. micro surface texturing ismade on the al7075-t6 by the uat in the face turning process. then, the influences of cutting speed feed, vibration direction and vibration ampl...

fertilization involves direct interaction of the sperm and oocyte, fusion of the cell membranes and :union: of male and female gamete genomes. the completion of this process and subsequent embryo development depend in part on the inherent integrity of the sperm dna. sperm genome quality has been emphasized for several years as playing a major role in early embryogenesis. there is clinical evide...

background:   objective: comparison of albumin and cabergoline in the prevention of ohss.   materials and methods: 95 high risk infertile women for ohss (more than 20 follicles in both ovaries at day of human chorionic gonadotropin (hcg) injection) were randomly divided into two groups. first group including 48 women received 10 unit intravenous albumin at starting oocyte retrieval, and second ...

abstract: aim and background: autism spectrum disorder is a complex childhood neurological disorder that affects all aspects of child development. the purpose of this study was to determine the effectiveness of an intervention program using animals to improve cognitive, social, behavioral functioning , and communication in children with autism spectrum disorders. methods and materials: 14 child...

in vitro fertilization (ivf) and other assisted reproductive technologies present an enormous hope to couples with fertility difficulties. assisted reproductive technology is one of the risk factors that can result in anxiety in these couples. indeed, ivf-treatments cause a stress, for both the woman and her partner. the different stages of the ivf-procedure can affect the emotional life of the...

in an environmentally benign solventless system, alcohols are rapidly oxidized to carbonyl compounds using hexamethylenetetramine-bromine on wet alumina under microwave irradiation.

leiomyoma is a rare esophageal tumor that constitutes less than 1% of esophageal malignancies. it should be removed when diagnosed even if asymptomatic. this study presents two cases of esophageal leiomyoma in 38 and 62 years old men who presented with dysphagia and evaluated for diagnosis and location of related tumors. patients were clinically examined and upper gastrointestinal endoscopy, ch...

a simple and green chemical procedure was reported for the synthesis of dihydropyrimidinones from various aldehydes, ethyl acetoacetate and urea or thiourea using  holmium chloride as catalyst. the reactions were performed under solvent free conditions with ultrasound irradiation as the energy source. the advantages of this protocol include the excellent yield, operational simplicity, short tim...

microwave-assisted hydrodistillation (mahd) at three levels of microwave power (180, 360, and 540 w) and the traditional hydrodistillation (hd) were applied to obtain essential oils from bunium persicum boiss. (black zira). mahd at 540 w started much earlier than that of hd (4 min vs. 38 min, respectively). by the time the extraction of essential oils started with hd, almost 50% of the total es...