Corneal Dermoid

A 20 years old boy presented with left corneal mass. The mass involved entire cornea extending to the sclera. The mass had a skin like surface and protruded outside the palpebral aperture. The eye with the mass was excised .The histopathology report confirmed the diagnosis of corneal dermoid. This late presentation of huge corneal dermoid extending to sclera is first such report in the literature

Over the counter ophthalmic drug misuse, are we aware?

Aim: To investigate the misuse of ‘over the counter’ ophthalmic medications in our city. Method: Responses of a structured questionnaire covering various aspects of over the counter drug use was obtained from pharmacy workers in and around our city. Results: Eighty nine pharmacy workers took part in this cross–sectional study. An average number of seven patients per day with ophthalmic complaints were seen by the pharmacy workers. Dispensing over the counter was practiced by 89.9% of the pharmacists. The most common complaint of the patients visiting the pharmacy, was redness and itching (86.5%). Antibiotics (96.6%) were the most common eye drops dispensed over the counter, followed by steroids (55.1%), decongestants (54.1%), antibiotic-steroid combination eye drops (29.2%) and lubricants (16.8%). Awareness regarding complications of steroid use was seen in 40.6% of pharmacists. 6.7% pharmacists had seen patients with complications following use of over the counter medications. In our study, majority of the eye drops dispensed were prescription drugs. Conclusion: Availability of prescription eye drops over the counter is an immense public threat. Educating the pharmacist and the population can decrease ocular morbidity. Research into methods to effectively deal with over-the-counter drug misuse is required and law can be enforced based on the findings

Metal phthalocyanine intermediates for the preparation of polymers

Metal 4, 4', 4"",-tetracarboxylic phthalocyanines (MPTC) are prepared by reaction of trimellitic anhydride, a salt or hydroxide of the desired metal (or the metal in powdered form), urea and a catalyst. A purer form of MPTC is prepared than heretofore. These tetracarboxylic acids are then polymerized by heat to sheet polymers which have superior heat and oxidation resistance. The metal is preferably a divalent metal having an atomic radius close to 1.35A

Metal (2) 4,4',4",4'" phthalocyanine tetraamines as curing agents for epoxy resins

Metal, preferably divalent copper, cobalt or nickel, phthalocyanine tetraamines are used as curing agents for epoxides. The resulting copolymers have high thermal and chemical resistance and are homogeneous. They are useful as binders for laminates, e.g., graphite cloth laminate

Modular perverse sheaves on flag varieties I: tilting and parity sheaves

In this paper we prove that the category of parity complexes on the flag variety of a complex connected reductive group is a "graded version" of the category of tilting perverse sheaves on the flag variety of the dual group, for any field of coefficients whose characteristic is good. We derive some consequences on Soergel's modular category O, and on multiplicities and decomposition numbers in the category of perverse sheaves.Comment: 42 pages; with a joint appendix with Geordie Williamso

Metal phthalocyanine polymers

Metal 4, 4', 4", 4"'=tetracarboxylic phthalocyanines (MPTC) are prepared by reaction of trimellitic anhydride, a salt or hydroxide of the desired metal (or the metal in powdered form), urea and a catalyst. A purer form of MPTC is prepared than heretofore. These tetracarboxylic acids are then polymerized by heat to sheet polymers which have superior heat and oxidation resistance. The metal is preferably a divalent metal having an atomic radius close to 1.35A

Process for preparing phthalocyanine polymer from imide containing bisphthalonitrile

Imide-linked bisphthalonitrile compounds are prepared by combining a dicyano aromatic diamine and an organic dianhydride to produce an amic acid linked bisphthalonitrile compound. The amic acid linked bisphthalonitrile compound is dehydrocyclized to produce the imide-linked bisphthalonitrile compounds. The imide-linked bisphthalonitrile compounds may be polymerized to produce a phythalocyanine polymer by heating the imide-linked bisphthalonitrile compound, either alone or in the presence of a metal powder or a metal salt. These compounds are useful in the coating, laminating and molding arts. The polymers are useful in composite matrix resins where increased fire resistance, toughness and resistance to moisture are required, particularly as secondary structures in aircraft and spacecraft

The Hurwitz Map and Harmonic Wave Functions for Integer and Half-Integer Angular Momentum

Harmonic wave functions for integer and half-integer angular momentum are given in terms of the Euler angles $(\phi,\theta,\psi)$ that define a rotation in $SO(3)$, and the Euclidean norm $r$ in ${\Bbb R}^3$, keeping the usual meaning of the spherical coordinates $(r,\phi,\theta)$. They form a Hilbert (super)-space decomposed in the form \Cal H=\Cal H_0\oplus\Cal H_1. Following a classical work by Schwinger, $2$-dimensional harmonic oscillators are used to produce raising and lowering operators that change the total angular momentum eigenvalue of the wave functions in half units. The nature of the representation space \Cal H is approached from the double covering group homomorphism $SU(2)\to SO(3)$ and the topology involved is taken care of by using the Hurwitz map $H:{\Bbb R}^4\to{\Bbb R}^3$. It is shown how to reconsider $H$ as a 2-to-1 group map, $G_0={\Bbb R}^+\times SU(2)\to {\Bbb R}^+\times SO(3)$, translating into an assignment $(z_1,z_2)\mapsto (r,\phi,\theta,\psi)$ in terms of two complex variables $(z_1,z_2)$, under the appropriate identification of ${\Bbb R}^4$ with ${\Bbb C}^2$. It is shown how the Lie algebra of $G_0$ is coupled with the two Heisenberg Lie algebras of the $2$-dimensional (Schwigner's) harmonic oscillators generated by the operators $\{z_1,z_2,\bar{z}_1,\bar{z}_2\}$ and their adjoints. The whole set of operators close either into a $9$-dimensional Lie algebra or into an $8$-dimensional Lie superalgebra. The wave functions in \Cal H can also be written in terms polynomials in the complex coordinates $(z_1,z_2)$ and their complex conjugates $(\bar{z}_1,\bar{z}_2)$ and the representations are explicitly constructed via highest weight (or lowest weight) vector representations for $G_0$.Comment: 19 pages, 1 diagra