Sample records for kalmus triin vihalemm
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PEOPLE IN PHYSICS: Interview with Professor Peter Kalmus
NASA Astrophysics Data System (ADS)
Wilson, Conducted by Catherine
1998-07-01
Peter Kalmus was born in 1933. He obtained his BSc and PhD at University College London. After a further period as a Research Associate he spent some years in America. He has been at Queen Mary and Westfield College (formerly just QMC) of the University of London since 1964, becoming Professor in 1978 and Head of Department from 1992 to 1997. He is Vice President of the Institute of Physics and also of the Royal Institution. Professor Kalmus is a well-known popularizer of physics and is active in the public understanding of science. He is a former Physics President of the British Association. He is an eminent researcher and received the Rutherford Medal and Prize for his contributions to the discovery of the W and Z particles, the carriers of the weak force. During 1998-99 he will be delivering the Institute's Schools and Colleges Lecture `Particles and the Universe', which will incorporate some of the new IOP 16-19 Physics curriculum material, in many UK locations.
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Chemical Laws, Idealization and Approximation
ERIC Educational Resources Information Center
Tobin, Emma
2013-01-01
This paper examines the notion of laws in chemistry. Vihalemm ("Found Chem" 5(1):7-22, 2003) argues that the laws of chemistry are fundamentally the same as the laws of physics they are all "ceteris paribus" laws which are true "in ideal conditions". In contrast, Scerri (2000) contends that the laws of chemistry are…
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Procedures for Testing Color Vision,
1981-01-01
Chromatic Discriminative Ability, 8 Congenital Sex-Linked Color Vision Defects, 8 Anomalous Trichromats, 9 Dichromats, 10 Autosomal Dominant Tritan Defect...anomalous trichromats (see Chapter 3). AUTOSOMAL DOMINANT TRITAN DEFECT In addition to the X-chromosomal-linked color defects, there are some very rare... hereditary color defects. The tritan defect is one of these rare defects (minimum frequency estimated to be between 1/13,000 and 1/65,000 [Kalmus
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NASA Astrophysics Data System (ADS)
1998-11-01
Readers may recall the interview with Professor Peter Kalmus which appeared in the July issue of Physics Education and which indicated his latest role of lecturer for the 1998-9 Institute of Physics Schools and Colleges Lecture series. This year's lecture is entitled `Particles and the universe' and the tour was due to begin in St Andrews, Scotland, late in September. Professor Kalmus will be looking at various aspects of particle physics, quantum physics and relativity, and discussing how they reveal the secrets of the beginning of our universe. His own experience of working at CERN, the European centre for particle physics in Switzerland, as well as at other international research facilities will provide a unique insight into activity in one of the most exciting areas of physics. The talks are aimed at the 16-19 age group but members of the public are also welcome to attend. They will act as an opportunity to gain a sneak preview of the dynamic new topics that will soon feature in the A-level syllabus arising from the Institute's 16-19 project. Further details of attendance are available from the local organizers, a list of whom may be obtained from Catherine Wilson in the Education Department at the Institute of Physics, 76 Portland Place, London W1N 3DH (tel: 0171 470 4800, fax: 0171 470 4848). The published schedule (as of September) for the lecture series consists of the following: Dates
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Excess Claims and Data Trimming in the Context of Credibility Rating Procedures,
1981-11-01
Triining in the Context of Credibility Rating Procedures by Hans BShlmann, Alois Gisler, William S. Jewell* 1. Motivation In Ratemaking and in Experience...work on the ETH computer. __.1: " Zen * ’ ’ II / -2- 2. The Basic Model Throughout the paper we work with the most simple model in the credibility...additional structure are summed up by stating that the density -3- f 8 (x) has the following form 1) fe(x) -(1-r)po (x/e) + rape(x) 3. The Basic Problem As
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Effect of high altitude on sensitivity to the taste of phenylthiocarbamide
NASA Astrophysics Data System (ADS)
Singh, S. B.; Chatterjee, A.; Panjwani, U.; Yadav, D. K.; Selvamurthy, W.; Sharma, K. N.
Sensitivity to the taste of phenylthiocarbamide (PTC) was studied using the Harris-Kalmus method in healthy human volunteers at sea level and then subsequently at an altitude of 3500 m over a period of 3 weeks, after which they were brought back to sea level. Blood sugar, insulin and blood cortisol levels were estimated weekly. The results indicated that, out of 51 subjects studied, 26 (55%) were PTC tasters at sea level. Eight of those unable to taste PTC at sea level tested as tasters at high altitude, and 2 of them reverted to being non-tasters on return to sea level. In the blood, an increase in cortisol and blood insulin levels was seen without any significant change in sugar levels. All the changes recorded at high altitude tended to return to basal values after re-induction to sea level. The study suggests that high-altitude hypoxia in some way, possibly involving changes in hormonal profile among other factors, causes an alteration in sensitivity to the taste of PTC, resulting in some of the individuals shifting to lower PTC sensitivity.
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Chemical Laws, Idealization and Approximation
NASA Astrophysics Data System (ADS)
Tobin, Emma
2013-07-01
This paper examines the notion of laws in chemistry. Vihalemm ( Found Chem 5(1):7-22, 2003) argues that the laws of chemistry are fundamentally the same as the laws of physics they are all ceteris paribus laws which are true "in ideal conditions". In contrast, Scerri (2000) contends that the laws of chemistry are fundamentally different to the laws of physics, because they involve approximations. Christie ( Stud Hist Philos Sci 25:613-629, 1994) and Christie and Christie ( Of minds and molecules. Oxford University Press, New York, pp. 34-50, 2000) agree that the laws of chemistry are operationally different to the laws of physics, but claim that the distinction between exact and approximate laws is too simplistic to taxonomise them. Approximations in chemistry involve diverse kinds of activity and often what counts as a scientific law in chemistry is dictated by the context of its use in scientific practice. This paper addresses the question of what makes chemical laws distinctive independently of the separate question as to how they are related to the laws of physics. From an analysis of some candidate ceteris paribus laws in chemistry, this paper argues that there are two distinct kinds of ceteris paribus laws in chemistry; idealized and approximate chemical laws. Thus, while Christie ( Stud Hist Philos Sci 25:613-629, 1994) and Christie and Christie ( Of minds and molecules. Oxford University Press, New York, pp. 34--50, 2000) are correct to point out that the candidate generalisations in chemistry are diverse and heterogeneous, a distinction between idealizations and approximations can nevertheless be used to successfully taxonomise them.
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Marco, Heather G; Simek, Petr; Clark, Kevin D; Gäde, Gerd
2013-03-01
Peptides of the adipokinetic hormone (AKH)/red pigment-concentrating hormone (RPCH) family were isolated and sequenced from the retrocerebral corpora cardiaca of four kissing bugs which are all vectors of the protozoan Trypanosoma cruzi responsible for Chagas' disease. The sequence of three novel AKHs were deduced from the multiple MS(N) electrospray mass data: the octapeptide pGlu-Leu-Thr-Phe-Ser-Thr-Asp-Trp amide (denoted Rhopr-AKH) in Rhodnius prolixus and Panstrongylus megistus, the nonapeptide pGlu-Leu-Thr-Phe-Thr-Pro-Asn-Trp-Gly amide (denoted Triin-AKH) in Triatoma infestans and the decapeptide pGlu-Leu-Thr-Phe-Ser-Asp-Gly-Trp-Gly-Asn amide (denoted Dipma-AKH) in Dipetalogaster maxima. The sequences were confirmed by identical behavior of natural and synthetic forms in reversed-phase HPLC and by CID-MS mass spectra. Conspecific injections of a dose of 10 pmol of the respective synthetic peptides resulted in a small but significant increase of the lipid concentration in the hemolymph. These experiments suggest that AKHs in kissing bugs act to regulate lipid metabolism, possibly during dispersal flights which is one of the mechanisms whereby the insects reach new outbreak areas. Copyright © 2012 Elsevier Inc. All rights reserved.
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Móricz, Ágnes M; Ott, Péter G; Morlock, Gertrud E
2018-03-30
The knowledge about the activity of polyacetylenes was extended by their new acetylcholinesterase inhibition and antibacterial activity against plant pathogenic bacteria. For this discovery, an utmost streamlined workflow, which we consider to be of high potential in the field of natural product or superfood search was developed. It demonstrates the combined power of biological, biochemical and chemical fingerprints. Bioactive components of tansy (Tanacetum vulgare L.) root extract were profiled and identified by high-performance thin-layer chromatography hyphenated with in situ effect-directed analysis, chemical derivatizations and high-resolution mass spectrometry (HPTLC-UV/Vis/FLD-EDA-HRMS). The effect-directed profiling was performed using four bacterial bioassays including two plant pathogens, an antioxidant assay and acetyl- and butyrylcholinesterase inhibitory assays. The chromatographic, spectral and powerful mass spectrometric study of zones that exerted substantial antibacterial and/or antioxidant and/or acetylcholinesterase inhibitory effects allowed these multi-potent zones to be identified as polyacetylenes. Five polyacetylene compounds were assigned to be 2-non-1-ene-3,5,7-triynyl-3-vinyl-oxirane, 2-(2,4-hexadiynylidene)-3,4-epoxy-1,6-dioxaspiro[4.5]decane, trans- and cis-2-(2,4-hexadiynylidene)-1,6-dioxaspiro[4.5]dec-3-ene and tetradeca-2,4,6-triine-8-en-12-one. This study clearly showed the advantage of the combined use of different ionization sources, i.e. electrospray ionization via an elution-head based interface and also the Direct Analysis in Real Time interface, for HRMS analysis of compounds from the same class with very similar chromatographic behavior and polarity. Copyright © 2018 Elsevier B.V. All rights reserved.
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NASA Astrophysics Data System (ADS)
2000-07-01
Ireland. Its pages are brimming with useful information to help sixth-formers and college students who wish to study physics make the very important decision regarding their particular choice of course and university. Under the heading `Summary tables of physics courses' every university listed in the publication has a table which includes all the courses on offer, their entrance requirements, duration and the awards given. Another section of the book entitled `Departmental information' includes data on the teaching and assessment styles of the Physics Department, special facilities plus a contact name and address. These sections, together with an expanded set of case studies of recent students and various other interesting articles, make this publication a must for anyone who is considering studying physics at university. Copies of Physics on Course 2001 will be available from Leila Solomon, Education Department, Institute of Physics, 76 Portland Place, London, W1N 3DH. The Particle Physics Wallchart (PCET) This full-colour chart, with a set of Teachers Notes, was published recently. It has been developed by PCET with Professor Peter Kalmus acting as expert consultant. The cost of the chart and notes is £7.75 plus VAT and copies can be purchased from PCET, 27 Kirchen Road, London W13 0UD (fax: 020 8566 5120). Inspire II The second part of Inspire was published in the Spring. It is a highly visual, full-colour leaflet which can be used as a stand-alone item but which was designed to `nest' inside the first four-page spread which was distributed in February. The occupational areas for physicists covered in the second leaflet include the media/leisure, finance and engineering (at technician level) industries. The third of the intended four sheets will be published later this year. (Copies of Inspire II have been included in the Affiliated schools/colleges package; other schools/colleges will be sent copies on request.) Nanotechnology - a technical brief The Industrial