pp 327-329 March 2020 Editorial
pp 332-332 March 2020 Science Smiles
pp 333-352 March 2020 Chien-Shiung Wu: The First Lady of Physics
C SWu was a Chinese-American experimentalist, best knownfor her path-breaking experiment that showed that parity isnot conserved in beta decay. Her results gave a deeper insightinto the nature of weak interactions and enabled the correctformulation of the theory behind such interactions. She was apassionate advocate of women entering into hitherto ‘forbidden’fields of physics and mathematics and was as outspokenagainst gender discrimination as she was concerned about environmentalconservation. It was generally felt that she wasoverlooked for the Nobel Prize, perhaps because she was awoman, and a Chinese one at that.
pp 353-362 March 2020 The Lekking Puzzle: The Evolution of Costly Mating Behaviour
Males display diverse behaviours to try to obtain mates. Somemale mating tactics, such as lekking, are spectacular becauseof the behaviours that they involve. Lekking males establishtiny, clustered territories without any resources attractive tofemales. They perform eye-catching displays, hardly feed,and compete intensely. Here, I describe the challenge thatlekking poses to our understanding of the evolution of malemating behaviour. I outline the main hypotheses proposed toexplain this behaviour and synthesize the evidence for thesehypotheses from empirical tests in wild populations.
pp 363-379 March 2020 Earth’s Magnetic Field and its Wandering Magnetic Poles
The Earth’s magnetic field has been a constant source of curiosityand wonder, for its ubiquitous use in navigation, theproperties of magnetic attraction and the influence and connectionto celestial phenomena like aurora, sunspots, etc.Records of magnetic measurements exist going back 400 years.Modern measurements, with the addition of satellite-borneobservations, provide accuracy and enables understanding ofintriguing characteristics of the geomagnetic field. Some ofthese are: magnetic polarity reversals, wandering of the magneticpoles and the most fundamental one: the origin of thefield in the Earth’s interior and the mechanisms that havesustained it for over a billion years.
pp 381-395 March 2020 Non-linear Chemical Reactions: A Comparison Between an Experiment and a Theoretical Model
In this article, we discuss the Belousov–Zhabotinsky (BZ) reactionand its relation with the Oregonator model of chemicalreactions. The Oregonator model has a limit cycle, andthe BZ reaction shows chemical oscillations. We comparethe time series obtained from the Oregonator model, with thetime series obtained from an experimental study of the BZ reactionand show that the qualitative behaviour is similar. Wealso construct the limit cycle from the experimental data usingthe Takens’ embedding theorem and compare it with thelimit cycle from the Oregonator model. We conclude with ademonstration of the spatio-temporal patterns which can beseen in the two-dimensional version of this system.
pp 397-417 March 2020 What are Operads?
This article aims to provide an informal introduction to ‘operads’.We work our way through motivations, examples, resultsand finally, give a sketchy description of the celebratedKoszul duality theory of operads.
pp 419-429 March 2020 Sticking and Signalling at the Synapse: Two Sides of the Same Coin?
Our brain and nervous system coordinate all activities of ourbody and its interaction with the environment. Our brain ismade up of a large number of cells called neurons that formspecialised points of contacts with other neurons. These contactsare called synapses. The development and functioningof these synapses are clearly vital for nervous system function.A set of molecules call Cell Adhesion Molecules (CAMs)have been shown to be required for the development and maintenanceof synapses. More recent work with CAMs indicatesthat these molecules are also required for signalling andhence normal functioning of synapses. Here, I discuss howCAMs function both in normal synapse development and insignalling at the synapse.
pp 431-441 March 2020 Topological Materials: New Quantum Phases of Matter
In this article, we provide an overview of the basic conceptsof novel topological materials. This new class of materialsdeveloped by combining the Weyl/Dirac fermionic electronstates and magnetism, provide a materials-science platformto test predictions of the laws of topological physics. Owingto their dissipationless transport, these materials hold highpromises for technological applications in quantum computingand spintronics devices.
pp 443-447 March 2020 Face to Face
pp 449-449 March 2020 Information and Announcements
pp 450-450 March 2020 Information and Announcements
pp 451-451 March 2020 Errata
pp 453-453 March 2020 Night Life
Volume 25 | Issue 5