Size-strain separation in diffraction line profile analysis.

Separation of size and strain effects on diffraction line profiles has been studied in a round robin involving laboratory instruments and synchrotron radiation beamlines operating with different radiation, optics, detectors and experimental configurations. The studied sample, an extensively ball milled iron alloy powder, provides an ideal test case, as domain size broadening and strain broadening are of comparable size. The high energy available at some synchrotron radiation beamlines provides the best conditions for an accurate analysis of the line profiles, as the size-strain separation clearly benefits from a large number of Bragg peaks in the pattern; high counts, reliable intensity values in low-absorption conditions, smooth background and data collection at different temperatures also support the possibility to include diffuse scattering in the analysis, for the most reliable assessment of the line broadening effect.

Powder diffraction in Bragg-Brentano geometry with straight linear detectors.

A common way of speeding up powder diffraction measurements is the use of one- or two-dimensional detectors. This usually goes hand in hand with worse resolution and asymmetric peak profiles. In this work the influence of a straight linear detector on the resolution function in the Bragg-Brentano focusing geometry is discussed.

Treating childhood obesity.

Nearly a third of children and adolescents are overweight or obese, which puts them at higher risk for diseases such as hypertension, type 2 diabetes, stroke, coronary heart disease and some cancers. This article discusses strategies physicians can use to address the issue of weight with children and their families. It also describes the efforts of a Minnesota collaborative that is working to improve obesity care and ensure insurance coverage for it.

Evolution of internal stresses in the plain ferritic steel studied by neutron diffraction in situ upon tensile straining.

The present in situ neutron diffraction study aims to investigate the response of selected lattice planes in the polycrystalline material upon tensile loading. For this purpose, the 0.1C-0.

Treating comorbid depression and anxiety.

Depression and anxiety disorders are distinct illnesses that often coexist. Patients suffering from both disorders have more psychological, physical, and social impairment than do patients suffering from either illness alone. Mixed anxiety-depression is gaining recognition as a separate diagnosis and has been included in the International Classification of Diseases, 10th edition, and in the appendix of the Diagnostic and Statistical Manual of Mental Disorders, 4th edition.

Management of depression.

Preview Although depression is an eminently treatable illness, it is often overlooked. When it is detected, it can be difficult to manage because of the adverse effects of antidepressant therapy. Dr Kuzel presents recommendations for better detection and treatment of this common clinical problem in the primary care setting.

Management of depression. Current trends in primary care.

Depression is a common illness that may be difficult to detect, especially in patients with concurrent illness. Fortunately, depression is usually treatable. Identifying the optimal antidepressant agent requires careful consideration of the patient's age, health status, and history of response to antidepressants.

Current perspectives on respiratory syncytial virus infection.

Respiratory syncytial virus (RSV) is the most important cause of acute viral bronchiolitis and pneumonia in infants and children. Management of RSV infection has changed dramatically over the past 5 to 7 years because of (1) the advent of widely available rapid tests for its specific identification and (2) use of the antiviral agent ribavirin (Virazole). Although RSV infection remains a life-threatening disease, particularly in certain high-risk groups, appropriate management and judicious use of ribavirin should help physicians reduce its morbidity and mortality.

Screening procedure for assessment of ototoxicity in the common marmoset.

Detection of drug-induced ototoxicity in safety evaluation studies of novel chemical entities is rarely attempted. Where such examinations are included, they usually rely on reflex testing. The Brainstem Auditory Evoked Response can be measured with the use of externally positioned electrodes, and it monitors electrophysiologic responses to sound from the cochlear nerve and associated structures of the 8th cranial nerve.

Benzodiazepine utilization in a family medicine residency program.

A study was conducted to determine the benzodiazepine-prescribing habits of residents in a family medicine training program. Data were collected from medication profiles of all patients seen at the Family Practice Center from July 1975 to February 1981. Additional demographic data (ie, age, sex) were collected on patients prescribed benzodiazepines, and prescribing behavior was validated according to the Psychopharmacological Screening Criteria Development Project.