Search Results - (Author, Cooperation:S. Varma)

2011-05-28

American Association for the Advancement of Science (AAAS)

0036-8075

1095-9203

Biology

Chemistry and Pharmacology

Computer Science

Medicine

Natural Sciences in General

Physics

Adult ; Brain/*physiopathology ; Brain Mapping ; Child ; Cognition ; Humans ; Learning ; *Learning Disorders/epidemiology/physiopathology/psychology ; *Mathematical Concepts ; Mathematics/*education ; Parietal Lobe/*physiopathology ; Software ; Teaching

2015-04-17

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Breast Neoplasms/*classification/*genetics ; Female ; Humans ; Mutation/*genetics ; Translocation, Genetic/*genetics

2018-09-12

American Chemical Society (ACS)

1523-7060

1523-7052

Chemistry and Pharmacology

2018-06-02

The American Association for Cancer Research (AACR)

1078-0432

1557-3265

Medicine

1365-2230

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

We present three patients who experienced late, severe bleeding from the superficial temporal artery (STA) following uncomplicated removal of basal cell carcinoma (BCC) from the temple. This is a common site for BCC and the risk of damage to the temporal branch of the facial nerve and the STA are well known. However, delayed bleeding as described in these individuals is potentially dangerous but poorly reported.

Electronic Resource

1365-2230

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2230

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Summary The popularity of tattoos is burgeoning with 20–30 million tattooed individuals in the Western World. Requests for removal can be expected to rise concurrently with increased applications. Laser removal of tattoos is potentially a more cosmetically acceptable method of removing tattoos than surgical excision or dermabrasion. Nevertheless, complications and side-effects can result from laser treatment and include scarring, hypopigmentation, hyperpigmentation, partial removal, infection, bleeding and tattoo ink darkening. The latter has been reported for flesh-toned and red tattoos. Such a complication has never been reported for the laser treatment of a yellow tattoo in the dermatological literature. We describe a case of tattoo ink darkening of a yellow tattoo after treatment with the 532 nm quality-switched Neodymium : Ytrrium-Aluminium Garnet laser to highlight clinicopathological features. The mechanism by which some tattoos darken after laser treatment is not clearly understood. We review darkening of tattoos after laser treatment to raise awareness of this important complication. This paper will help to facilitate discussions with the patient and in obtaining informed consent prior to commencing treatment. Tattoo ink darkening of a yellow tattoo adds to the growing list of complications resulting from attempts at tattoo removal.

Electronic Resource

1365-2230

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

The development of a squamous cell carcinoma (SCC) in a linear epidermal naevus is a rare event previously reported in long-standing and often extensive lesions of middle-aged to elderly patients. To the best of our knowledge, this case appears to be only the second report of an SCC arising in a linear epidermal naevus in a young patient and the first report of two SCCs developing in a small epidermal naevus, over a short time, in a young patient with no other risk factors.

Electronic Resource

1365-2230

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2133

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Background  Photodynamic therapy (PDT) has not yet been demonstrated to be superior to conventional treatment in the treatment of superficial skin cancers and premalignant skin conditions. A limitation for PDT is the absence to date of a light source suitable for the treatment of larger lesions or ‘field changes’ where several lesions are present on one anatomical site. Objectives  To investigate the safety and efficacy of a large field light source, the Waldmann PDT 1200, in the treatment of Bowen’s disease (BD), superficial basal cell carcinomas (BCCs) and solar keratoses (SKs). Methods  After application of 5-aminolaevulinic acid for 4–6 h, each lesion was irradiated with 105 J cm−2 of incoherent red light centred on 640 nm. Eighty-eight patients with 239 lesions were recruited. Results  Within two treatments, 88% of BD lesions, 95% of BCCs and 99% of SKs showed complete clinical clearance. At 12 months the complete response rates were 69% for BD, 82% for BCC and 72% for SK. Conclusions  This study confirms that PDT is a useful treatment and that selected superficial BCCs and SKs respond well to PDT. The PDT 1200 light source proved capable of treating multiple lesions amounting to a ‘field change’ and also lesions up to 10 cm in diameter within an acceptable treatment time. Thus far, PDT has failed to become established as a routine treatment for small premalignant and malignant skin lesions as it has not proved superior to simple cheaper conventional therapies such as cryotherapy, curettage and cautery, topical chemotherapy with 5-fluorouracil, or surgery. However, PDT has become established as a treatment for selected cases in some centres. This study suggests a role for PDT in the treatment of large premalignancies, superficial BCCs and field change where existing treatments may be problematic.

Electronic Resource

1365-2133

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2133

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2133

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1089-7550

AIP Digital Archive

Physics

For the present investigation n-Si/SiO2/In2O3 transparent gate structures were fabricated by electron-beam evaporation of a tin-doped indium oxide layer on thermally oxidized silicon. Admittance measurements were carried out in dark and under three different levels of illumination. A comprehensive technique has been presented for obtaining interface state density distribution from illuminated capacitance data as well as from illuminated conductance data, and hole and electron capture cross sections from the latter. This technique includes a procedure for identification of the dominant quasi-Fermi level (imref) under illumination for determination of the state energy level, three independent methods for evaluating the imref separation from measured data, and a procedure for ascertaining whether electron or hole exchange is the source of a set of Gp/ω vs V or ω characteristics. The interface state density distribution of unannealed structures exhibited two peaked profiles. One peak was located about 0.36–0.41 eV above the valence-band edge, while the other was located about 0.30–0.17 eV below the conduction-band edge. The peak magnitude was found to increase with the illumination intensity and the peak position moved towards the respective band edge. Electron capture cross sections of states in the upper band gap half were found to be in the range of 10−18–10−20 cm2, and hole capture cross sections of states in the lower band gap half in the range of 10−15–10−16 cm2. Both σe and σh were found to vary with band-gap energy and illumination level.

Electronic Resource

1089-7658

AIP Digital Archive

Mathematics

Physics

We present an exactly solvable quantum field theory which allows rearrangement collisions. We solve the model in the relevant sectors and demonstrate the orthonormality and completeness of the solutions, and construct the S-matrix. In light of the exact solutions constructed, we discuss various issues and assumptions in quantum scattering theory, including the isometry of the Möller wave matrix, the normalization and completeness of asymptotic states, and the nonorthogonality of basis states. We show that these common assertions are not obtained in this model. We suggest a general formalism for scattering theory which overcomes these and other shortcomings and limitations of the existing formalisms in the literature. © 1996 American Institute of Physics.

Electronic Resource

1089-7623

AIP Digital Archive

Physics

Electrical Engineering, Measurement and Control Technology

The developmental details of a thermistor bolometer-type infrared sensor made from chemically prepared oxides of nickel and manganese have been described. The response time/time constant of these sensors can be tailored to a low or high value depending upon the need. A procedure for determining the total emittance of the source by using these sensors in a scanner consisting of an infrared transmitting lens and preamplifier is also discussed.

Electronic Resource

1089-7666

AIP Digital Archive

Physics

The transition from Taylor vortex flow to wavy vortex flow in the Couette–Taylor problem, for finite annulus lengths, is studied. Using an accurate, fully resolved numerical code, infinite-cylinder nonlinear axisymmetric Taylor vortices are computed and their stability with respect to nonaxisymmetric disturbances corresponding to wavy vortices is determined. The present method computes leading eigenmodes and eigenvalues for arbitrary axial Floquet exponents k and arbitrary azimuthal wave numbers m, so that the full complex dispersion relation ω=ω(k,m) is obtained. The linear coefficients appearing in the Ginzburg–Landau equation are calculated and compared to previous experimental results. It is found that for aspect ratios (length to gap width) less than 30, the Ginzburg–Landau predictions are not reliable; for these aspect ratios the transition is modeled as the superposition of two Floquet modes with k=±π/L, where L is the length of the annulus. This model is verified via a detailed numerical and experimental study at aspect ratios between 8 and 34, for radius ratio 0.87, obtaining good agreement for the critical Reynolds numbers, azimuthal wave numbers and wave speeds over the entire aspect-ratio range.

Electronic Resource

1365-2133

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2044

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource

1365-2044

Blackwell Publishing Journal Backfiles 1879-2005

Medicine

Electronic Resource