1,563 research outputs found
Clinical Immunodermatology Mark V.DahlClinical Immunodermatology1981Yearbook Medical PublishersChicago280$27.50
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Botanical Dermatology JohnMitchellAruthurRookBotanical Dermatology1979VancouverGreengrass787
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Histalogic Diagnosis of Inflammatory Skin Disease A.B.AckermanHistalogic Diagnosis of Inflammatory Skin Disease1978Lea & FebigerPhiladelphia863674 illustrations, $84.50
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Clinical Skin Microbiology RazaAlyHowardMaibachCharles CThomas1978SpringfieldIllinois133$14.50, 50 illustrations
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Hereditary Trichodysplasia: Marie Unna'S Hypotrichosis
This is a study of eight members of one family with Marie Unna hypotrichosis occurring in five generations. All affected individuals were born with widespread facial “milia”, sparse scalp hair and decreased body hair. Laboratory studies including urinary amino acids and plasma testosterone were normal. On histologic examination the hair follicles of the scalp showed proliferation of the internal root sheath and horn pearl formation in the lower third of the follicle. Abnormal hairs were flat and ribbon-like and twisted at irregular intervals. Extensive peeling of the cuticle was demonstrated by scanning electron microscopy. Electron microscopy of the hair shafts revealed intracellular fractures of the cuticular cells, increased interfibrillar matrix and fractures of the cortical cell fibrils and fractures of the medullary cells. X-ray diffraction studies were normal. On amino acid analysis of affected hairs a small decrease in cysteine-cystine and an increase in methionine content was noted. Since the hair shafts are clearly abnormal in this disorder, the name hereditary trichodysplasia is suggested. The condition is inherited as an autosomal dominant trait
Molecular gas in nearby low-luminosity QSO host galaxies
This paper addresses the global molecular gas properties of a representative
sample of galaxies hosting low-luminosity quasistellar objects. An abundant
supply of gas is necessary to fuel both the active galactic nucleus and any
circum-nuclear starburst activity of QSOs.
We selected a sample of nearby low-luminosity QSO host galaxies that is free
of infrared excess biases. All objects are drawn from the Hamburg-ESO survey
for bright UV-excess QSOs, have DEC>-30 degrees and redshifts that do not
exceed z=0.06. The IRAM 30m telescope was used to measure the CO(1-0) and
CO(2-1) transition in parallel.
27 out of 39 galaxies in the sample have been detected. The molecular gas
masses of the detected sources range from 0.4E9 M_sun to 9.7E9 M_sun. We can
confirm that the majority of galaxies hosting low-luminosity QSOs are rich in
molecular gas. The properties of galaxies hosting brighter type I AGN and
circumnuclear starformation regions differ from the properties of galaxies with
fainter central regions. The overall supply of molecular gas and the spread of
the line width distribution is larger. When comparing the far-infrared with the
CO luminosities, the distribution can be separated into two different
power-laws: one describing the lower activity Seyfert I population and the
second describing the luminous QSO population. The separation in the
L_FIR/L'_CO behavior may be explainable with differing degrees of compactness
of the emission regions. We provide a simple model to describe the two
power-laws. The sample studied in this paper is located in a transition region
between the two populations
Spatio-Temporal Scaling of Solar Surface Flows
The Sun provides an excellent natural laboratory for nonlinear phenomena. We
use motions of magnetic bright points on the solar surface, at the smallest
scales yet observed, to study the small scale dynamics of the photospheric
plasma. The paths of the bright points are analyzed within a continuous time
random walk framework. Their spatial and temporal scaling suggest that the
observed motions are the walks of imperfectly correlated tracers on a turbulent
fluid flow in the lanes between granular convection cells.Comment: Now Accepted by Physical Review Letter
Long-term trends in the longevity of scientific elites: evidence from the British and the Russian academies of science.
National science academies represent intellectual elites and vanguard groups in the achievement of longevity. We estimated life expectancy (LE) at age 50 of members of the British Royal Society (RS) for the years 1670-2007 and of members of the Russian Academy of Sciences (RAS) for the years 1750-2006. The longevity of academicians was higher than that of their corresponding national populations, with the gap widening from the 1950s. Since the 1980s, LE in the RS has been higher than the maximum LE among all high-income countries. In each period, LE in the RS was greater than in the RAS, although since the 1950s it has risen in parallel in the two academies. This steep increase shared by academicians in Britain and Russia suggests that general populations have the potential for a substantial increase in survival to high ages
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