The title pyrrole derivative, C(12)H(17)NO(4), consists of a pyrrole ring with two diagonally attached meth-oxy-carbonyl groups and two diagonally attached ethyl groups. The two carbonyl groups are approximately in the same plane as the pyrrole ring, making dihedral angles of 3.50 (19) and 6.70 (19)°. In the crystal, adjacent mol-ecules are assembled into dimers in a head-to-head mode by pairs ...

The title compound, C(84)H(112)O(36), has a macrocyclic structure. It has 12 (meth-oxy-carbon-yl)meth-oxy 'head groups' in the upper rim and exhibits a flattened boat geometry. Intra-molecular C-H⋯O hydrogen bonds occur. In the crystal, inter-molecular C-H⋯O contacts occur. The 'head groups' and the pentyl 'feet' contain disordered (0.5:0.5 occupancy ratio) atoms.

minor trauma to the head is common in childhood and does not require any medical or surgical treatment. nevertheless, head injury in infancy and childhood is the single most common cause of death and permanent disability. measurable deficits occur even after mild to moderate head injury but are markedly greater after severe injury. they include impaired cognition, motor impairments, disruption ...

conclusions the study revealed the significance of anthropometric variables related to heading, such as age and head perimeter. therefore, it was concluded that these variables should be considered when teaching and practicing the heading technique with players of different ages and anthropometric sizes. results significant correlations existed between the force exerted on the head during headi...

Since the 1960 Child Safety Systems in cars have been developed. The 3 point safety belt for adults rated as one of the 10 most important inventions for mankind, the seat belt has saved more than 1.5 Million lives. As well children have to be secured in a car but the 3 point belt is designed for adults. A 27 kg child is forced forward with 1.200 kg at 48 kph impact velocity. Here vulnerable bod...

1.1 Identifying Whether a Coin is Biased Lemma 1 We need O( 1 2 ) coin tosses to discern a biased coin with the probability of 1 2 − for head (and obviously with the probability of 12 + for tail), from an unbiased coin. Proof Consider two hypothesises H1 and H2 where respectively denote biased and unbiased coins. In other words, we have the following hypothesises: { H1 : biased p(h) = 12 − H2 :...

conclusions both eps and er residents either missed or falsely called a significant number of pathologies in their interpretations. the interpretations of eps and er residents were more sensitive and more specific, respectively. these findings revealed the need for increased training time in head ct reading for residents and the necessity of attending continuing medical education workshops for ...

OBJECTIVE To determine the pattern of early growth disturbance in chromosomally abnormal fetuses by comparing the volume of the fetal head to that of the trunk. METHODS The fetal trunk and head volume was measured using three-dimensional (3D) ultrasound in 145 chromosomally abnormal fetuses at a median gestational age of 12 (range, 11 + 0 to 13 + 6) weeks. The head volume was measured separat...

conclusions carcinomas were the most common malignant tumors of head and neck observed in this age group. also, oral cancers in children and adolescents constitute a small percentage of the lesions that were studied objectives we aimed to determine the frequency of head and neck cancers in a population of iranian children and adolescents. patients and methods the records of patients ≤ 19 years ...

introduction: head and neck sarcomas involve a group of rare malignant diseases with a high histological variability involving various anatomical sites that can lead to under-reporting of the true incidence of these neoplasms. this study aimed to epidemiologically investigate the occurrence of sarcomas of the head and neck within the past 20 years in yazd, iran (1994– 2014). materials and metho...