Identification and characterization of fullback, a novel posteriorly-expressed Xenopus gene : master's thesis submitted

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Biology, June 1999."May 19, 1999."Includes bibliographical references (leaves [12]-[13]).by M. Elizabeth Hick.S.M

A Contribution to the Flora of the Lower Coal-measures of the Parish of Halifax, Yorkshire

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Outburst of Comet 17P/Holmes Observed With The Solar Mass Ejection Imager

We present time-resolved photometric observations of Jupiter family comet 17P/Holmes during its dramatic outburst of 2007. The observations, from the orbiting Solar Mass Ejection Imager (SMEI), provide the most complete measure of the whole-coma brightness, free from the effects of instrumental saturation and with a time-resolution well-matched to the rapid brightening of the comet. The lightcurve is divided into two distinct parts. A rapid rise between the first SMEI observation on UT 2007 October 24 06h 37m (mid-integration) and UT 2007 October 25, is followed by a slow decline until the last SMEI observation on UT 2008 April 6 22h 16m (mid-integration). We find that the rate of change of the brightness is reasonably well-described by a Gaussian function having a central time of UT 2007 October 24.54+/-0.01 and a full-width-at-half-maximum 0.44+/-0.02 days. The maximum rate of brightening occurs some 1.2 days after the onset of activity. At the peak the scattering cross-section grows at 1070+/-40 km^2/s while the (model-dependent) mass loss rates inferred from the lightcurve reach a maximum at 3+/-10^5 kg/s. The integrated mass in the coma lies in the range (2 to 90)x10^10 kg, corresponding to 0.2% to 10% of the nucleus mass, while the kinetic energy of the ejecta is (0.6 to 30) MTonnes TNT. The particulate coma mass could be contained within a shell on the nucleus of thickness ~1.5 to 60 m. This is comparable to the distance traveled by conducted heat in the century since the previous outburst of 17P/Holmes. This coincidence is consistent with, but does not prove, the idea that the outburst was triggered by the action of conducted heat, possibly through the crystallization of buried amorphous ice.Comment: 27 pages, 8 figures; http://www2.ess.ucla.edu/~jingli/Holmes_SMEI/17P_Holmes.htm

3-D reconstructions of the early-November 2004 CDAW geomagnetic storms: analysis of Ooty IPS speed and density data

Interplanetary scintillation (IPS) remote-sensing observations provide a view of the solar wind covering a wide range of heliographic latitudes and heliocentric distances from the Sun between ~0.1 AU and 3.0 AU. Such observations are used to study the development of solar coronal transients and the solar wind while propagating out through interplanetary space. They can also be used to measure the inner-heliospheric response to the passage of coronal mass ejections (CMEs) and co-rotating heliospheric structures. IPS observations can, in general, provide a speed estimate of the heliospheric material crossing the observing line of site; some radio antennas/arrays can also provide a radio scintillation level. We use a three-dimensional (3-D) reconstruction technique which obtains perspective views from outward-flowing solar wind and co-rotating structure as observed from Earth by iteratively fitting a kinematic solar wind model to these data. Using this 3-D modelling technique, we are able to reconstruct the velocity and density of CMEs as they travel through interplanetary space. For the time-dependent model used here with IPS data taken from the Ootacamund (Ooty) Radio Telescope (ORT) in India, the digital resolution of the tomography is 10° by 10° in both latitude and longitude with a half-day time cadence. Typically however, the resolutions range from 10° to 20° in latitude and longitude, with a half- to one-day time cadence for IPS data dependant upon how much data are used as input to the tomography. We compare reconstructed structures during early-November 2004 with in-situ measurements from the Wind spacecraft orbiting the Sun-Earth L<sub>1</sub>-Point to validate the 3-D tomographic reconstruction results and comment on how these improve upon prior reconstructions

Database Engineering Processes with DB-MAIN

Software engineering needs more and more to be supported by CASE tools. Since databases are at the heart of information systems, they deserve a particular attention. More and more CASE tools allow method engineers to implement their own methodology and they allow users to record all their actions, with their rationales, in order to improve the quality of the design and the quality of the documentation of the design. DBMAIN is such a database oriented tool with a method description and a documentation generation facilities. But it has its particularities like its procedural non-deterministic Method Description Language, its well integrated multilevel histories and its userfriendly methodological engine

The Problem of Prickling on Fabrics of South American Camelids Fibers: Possible Approaches for Mechanical Solutions

In this minireview it is to analyze the physical attributes that determine the comfort of fabrics made of South American Camelid fibers (Lama and Alpaca), discuss the effect on their textile value and evaluate an possible approache on their possible mechanical solutions. Taking the distribution of all fibers do not respond to a normal distribution, but the different fiber types identified by the type of medulla, they do respond to a normal distribution. While emphasis has always been on mean fiber diameter, the fiber frequency exceeding 30 microns (objectionable fibres) has a key role in quality. This is essential for light fabrics, where the effect of prickle plays a critical part in consumer´s choice. Dehairing, as a mechanical way, provides an immediate solution, though excessive fiber breakage should be addressed. It is concluded that the textile fiber quality of South American Camelids is promissory if the presence of objectionable fibers is solved, resulting in a tolerable frequency for consumers (<3%). This implies a true paradigm shift with regard to the classic textile processing of Alpaca and Lama fibers (from worsted to woolen system). This would enhance the fiber softness to touch, together with other important features that would render the fiber price more competitive

Assessing and managing mental health issues in people with chronic skin conditions

Chronic skin conditions, such as atopic eczema and psoriasis, can have significant psychological effects on patients. For example, these conditions can affect an individual’s functioning, and may lead to mental health issues such as depression or anxiety disorders. This article identifies the links between chronic skin conditions and mental health issues, and discusses the nurse’s role in assessing, managing and supporting patients with these comorbidities. It also emphasises the importance of using validated tools and a holistic approach to care, and discusses how to address challenges that patients may experience