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Search Results: 1 - 10 of 827 matches for " Amos Wilamowski "
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External Ophthalmomyiasis Caused by a Rare Infesting Larva, Sarcophaga argyrostoma
Shmuel Graffi,Avi Peretz,Amos Wilamowski,Heather Schnur,Fouad Akad,Modi Naftali
Case Reports in Ophthalmological Medicine , 2013, DOI: 10.1155/2013/850865
Abstract: Purpose. External ophthalmomyiasis (EO) is caused by infesting larvae belonging to various species of flies. Most documented cases result from sheep (Oestrus ovis) and Russian (Rhinoestrus purpureus) botfly larvae, but we recently discovered a rare case of EO caused by flesh fly (Sarcophaga argyrostoma) larvae. Here, we report the case of a patient with EO who had been hospitalized and sedated for 1 week because of unrelated pneumonia. Methods. Case report. Results. A total of 32 larvae were removed from the adnexae of both eyes. Larvae identification was confirmed through DNA analysis. Treatment with topical tobramycin resulted in complete resolution of EO. Conclusion. EO can be caused by S. argyrostoma, and the elderly and debilitated may require extra ocular protection against flies during sedation. 1. Introduction The term ophthalmomyiasis implies the presence of fly larvae within (internal ophthalmomyiasis) or around (external ophthalmomyiasis; EO) the orbital region. EO is the more benign infestation and is commonly caused by sheep (Oestrus ovis) [1] or Russian gad (Rhinoestrus purpureus) flies botflies. Although various flies may cause ophthalmomyiasis [2], no previous reports of EO resulting from Sarcophaga argyrostoma (flesh fly), could be found in the literature (Google Scholar, PubMed search terms: “Ophthalmomyiasis and S. argyrostoma”). This gray-coloured fly belongs to the Sarcophagidae family and exists worldwide, usually around corpses [3] and, to a much lesser extent, in open wounds. Here, we report a recent case of hospital-acquired EO resulting from S. argyrostoma larvae. 2. Case Report A 91-year-old man from Northern Israel, where agriculture is abundant, was admitted to a local hospital for pneumonia and was placed in the care of the Department of Internal Medicine. Because of a general deterioration in health, the man was sedated and intubated. One week later, in the late afternoon of October 28, 2013, a nurse discovered larvae on the palpebral fissure of both eyes. A bedside ophthalmic examination revealed multiple motile larvae in the inferior fornices of both eyes (Figure 1). Retraction of the lids enabled visualization of most of the larvae that were avoiding the light. The conjunctiva was diffusely congested, and a mucopurulent secretion was present in the inferior fornices. Other findings of the examination were unremarkable. Figure 1: Retraction of the left eyelid revealed multiple larvae resting in the inferior fornix. Mucopurulent discharge can also be seen. Topical oxybuprocaine hydrochloride (0.4%) drops were administered
Electrically detected spin resonance
Jacek Bloniarz,Zbyslaw Wilamowski
Optica Applicata , 2006,
Abstract: An amplitude and a line shape of electrically detected signal of spin resonance are discussed. Since the signal scales with changes of spin polarization under resonance condition it is proportional to longitudinal spin relaxation. The analysis shows that such a method of detection of spin resonance is especially useful for low dimensional semiconductor structures.
Spintronics in semiconductors
Z. Wilamowski,A. Werpachowska
Physics , 2011,
Abstract: For the last years spin effects in semiconductors have been of great interest not only in the context of solid state physics, but also for their potential usage in technology. In this paper we give a short review of spintronic materials, in which electron spin as an additional degree of freedom is exploited. Afterwards, we discuss the properties of classic, non-magnetic semiconductors, where the efforts are put on enriching the traditional semiconductor technology engaging the electrical effects of spin effects. Various phenomena and scientific state of the art is highlighted.
The RKKY coupling in diluted magnetic semiconductors
A. Werpachowska,Z. Wilamowski
Physics , 2011,
Abstract: This paper is an attempt to modify the classic Ruderman-Kittel-Kasuya-Yosida (RKKY) model to allow the analysis of the magnetic resonance measurements. In our calculations, we follow the treatment of the original authors of the RKKY model but include the finite band splitting, {\Delta}, as a phenomenological parameter. The RKKY exchange is not anymore of Heisenberg type and an anisotropy induced by the direction of carrier magnetization occurs.
The longitudinal spin relaxation of 2D electrons in Si/SiGe quantum wells in a magnetic field
Z. Wilamowski,W. Jantsch
Physics , 2001,
Abstract: The longitudinal spin relaxation time, T1, in a Si/SiGe quantum well is determined from the saturation of the ESR signal. We find values of a few microseconds. Investigations of T1 as a function of Fermi energy, concentration of scattering centers and of the momentum scattering time lead to the conclusion that for high electron mobility the spin relaxation is ruled by the Dyakonov-Perel (DP) mechanism while for low mobility the Elliott-Yaffet mechanism dominates. The DP relaxation is caused by Bychkov-Rashba coupling. Evaluation of the DP mechanism shows that 1/T1 for high electron mobility can be effectively reduced by an external magnetic field. The effect of the degenerate Fermi-Dirac statistics on the DP process is discussed.
Evaluation of the Bychkov- Rashba Field from the Spin Resonance of Electrons in a Si Quantum Well
Z. Wilamowski,W. Jantsch
Physics , 2001,
Abstract: From spin resonance of two-dimensional (2D) conduction electrons in a modulation doped SiGe/Si/SiGe quantum well structure we find a 2D anisotropy of both the line broadening (dephasing time) and the g-factor. We show that these can be explained consistently in terms of the Bychkov-Rashba (BR) field which here is the dominant coupling between electron motion and spin. We obtain a BR parameter of alpha = 1.1 e-12 eV cm - three orders of magnitude smaller as compared to III-V wells. Extrapolating for low electron concentrations we obtain a g-factor of the Si conduction band of 2.00073+/-0.00010.
A “Fine Structure Constant” for Inertia  [PDF]
Amos Harpaz
International Journal of Astronomy and Astrophysics (IJAA) , 2013, DOI: 10.4236/ijaa.2013.34046
Abstract:

We try to find a physical source for the inertial force, which contradicts the acceleration of an object. We find that when an object is accelerated, its gravitational field curves, and the stress force created in this curved field acts on the object against the accelerating force, thus supplying part of the inertial force that contradicts the acceleration. We also find that this force includes a term which is similar to the fine structure constant used in quantum mechanics. As well, we find that this term equals unity for a black hole object. Further work is needed in order to find whether the complete inertial force can be found in this way. The experimental results that may prove this approach are still very limited.

Ghanaian Female Immigrant Entrepreneurs in Canada: Experiences, Challenges, and Coping Strategies  [PDF]
Amos Nkrumah
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.410005
Abstract: Immigrant women of African descent face series of injustices in the process of integrating into the host society, particularly in the labour market because they are women and minorities. The purpose of this paper is to explore the experiences, challenges, and strategies of these female immigrant entrepreneurs in Canada. Using snow-ball sampling and in-depth interview, principally these women go into entrepreneurship due to family considerations. Furthermore, there are several injustices that the women face, such as race regarding the colour of skin, and the accented manner they speak English. The study also finds that Ghanaian women entrepreneurs have developed coping strategies through the building of networks, determination, and “faceless” business transactions to overcome the inequalities, and to win and maintain clients and expand their business.
The Philosophy-Psychology Linkage  [PDF]
Amos Avny
Open Journal of Philosophy (OJPP) , 2018, DOI: 10.4236/ojpp.2018.83016
Abstract: The Essay explores two questions about the subject: a. whether exist any linkage between Philosophy and Psychology, and b. what is the nature of this linkage? Actually, the Author answers that such a linkage already exists. In fact, these two disciplines are like two sides of the same coin, they are complementary rather than competitive. For clarifying this argument the Author discusses 3 example cases, examining the whole individual-organization complex. The Essay describes Adam and Eve’s nature and curiosity, qualities that empowered them in their search for knowledge. This behavior also made them the fore-parents of all explorers, pioneers and researchers who followed them. Further, the Author indicates how wrong use of ideological declarations hurts individuals and subdues them. Finally, the Author advocates the introducing of the “Normal Distribution Method” and the “Bell type Curve” as main tools in teaching and studying Social Sciences.
Molecular Characterization of Borrelia persica, the Agent of Tick Borne Relapsing Fever in Israel and the Palestinian Authority
Gracia Safdie,Iba Y. Farrah,Reem Yahia,Esther Marva,Amos Wilamowski,Samer S. Sawalha,Naama Wald,Judith Schmiedel,Annette Moter,Ulf B. G?bel,Herve Bercovier,Ziad Abdeen,Marc V. Assous,Yolanta Fishman
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0014105
Abstract: The identification of the Tick Borne Relapsing Fever (TBRF) agent in Israel and the Palestinian Authority relies on the morphology and the association of Borrelia persica with its vector Ornithodoros tholozani. Molecular based data on B. persica are very scarce as the organism is still non-cultivable. In this study, we were able to sequence three complete 16S rRNA genes, 12 partial flaB genes, 18 partial glpQ genes, 16 rrs-ileT intergenic spacers (IGS) from nine ticks and ten human blood samples originating from the West Bank and Israel. In one sample we sequenced 7231 contiguous base pairs that covered completely the region from the 5′end of the 16S rRNA gene to the 5′end of the 23S rRNA gene comprising the whole 16S rRNA (rrs), and the following genes: Ala tRNA (alaT), Ile tRNA (ileT), adenylosuccinate lyase (purB), adenylosuccinate synthetase (purA), methylpurine-DNA glycosylase (mag), hypoxanthine-guanine phosphoribosyltransferase (hpt), an hydrolase (HAD superfamily) and a 135 bp 5′ fragment of the 23S rRNA (rrlA) genes. Phylogenic sequence analysis defined all the Borrelia isolates from O. tholozani and from human TBRF cases in Israel and the West Bank as B. persica that clustered between the African and the New World TBRF species. Gene organization of the intergenic spacer between the 16S rRNA and the 23S rRNA was similar to that of other TBRF Borrelia species and different from the Lyme disease Borrelia species. Variants of B. persica were found among the different genes of the different isolates even in the same sampling area.
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