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11.
Sadanand Nanjundiah 《Journal of Science Education and Technology》1993,2(4):559-563
Conclusions The survey indicated many problems with both how physics is taught and how it is understood. Specifically: (1) Students seem to be less diligent in their senior year in high school (when physics is most commonly offered). For many, this is the only physics course in their school careers. (2) Students think of physics as a difficult subject that makes extraordinary mathematical and conceptual demands. There are serious deficiencies in both areas. (3) Many school teachers of physics have only one or two years of college physics background. 相似文献
12.
Sadanand Nanjundiah 《Journal of Science Education and Technology》1996,5(2):161-165
Students from Asian societies have generally done well in the sciences in Western universities. Many factors have been invoked to explain their success. This paper is a study of one possible factor—the training of teachers for schools, specifically as investigated from first-hand observation by the author from Northwest Normal University in Lanzhou, China, and its affiliated primary and secondary schools. 相似文献
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14.
Vidyanand Nanjundiah 《Resonance》2010,15(6):503-513
Conrad Hal Waddington was an English biologist who was among the earliest to emphasise that the proper understanding of multicellular
development required an evolutionary approach. More than 50 years ago he carried out a series of experiments with intriguing
implications for the evolution-development link. They appeared to demonstrate that it was possible for evolutionary change
to take place and a qualitatively different developmental outcome to result without the action of selection on spontaneous
mutations — that is, without the conventional neo-Darwinian route coming into play. The findings suggested that Lamarckian
mechanisms might be at work, namely that acquired traits might be heritable. When Waddington is remembered today, it is for
this set of experiments and for the explanation that he gave, which he named genetic assimilation. The explanation postulated that as a consequence of evolution, the course of normal development was canalised or buffered against perturbations. What follows is an informal and non-technical account of his work on genetic assimilation
and his less successful effort to build a theoretical biology. 相似文献
15.
Vidyanand Nanjundiah 《Resonance》2009,14(2):124-153
A happy accident enabled the young Charles Darwin to go on a voyage of exploration a round the world. Among the outcomes of
that voyage was a book, The Origin of Species, which was published in 1859. In it Darwin developed aperspective of the living world that, as we have come to realise, encapsulates
its essence. By viewing plants and animals as dynamical entities that were subject to external forces, he was able to show
convincingly that they had evolved, on the whole by a process known as natural selection. In doing so he made the point that
the living world was explainable on the basis of natural laws and, at the same time, that biology can lay claim to an autonomous
status among the natural sciences. Paradoxically, he a ccomplished all this with out knowing how heredity worked or variations
occurred. This article attempts to look at The Origin of Species from the vantage point of the present. Anaccount of the events that led to the writing of the book will be followed by a
quick run through its contents. The essay ends with a mention of some issues that continue to engage evolutionary biologists
today.
The author has a PhD in physics from the University of Chicago. His research interests lie in the areas of developmental biology
and evolution.
Text of the L K Ananthakrishnan Memorial Lecture, Pune, 13 February 2009. 相似文献
16.
Sadanand B. Patil M. V. Kodliwadmath Sheela M. Kodliwadmath 《Indian journal of clinical biochemistry : IJCB》2008,23(1):45-48
The present study was designed to evaluate the lipid peroxidation and non-enzymatic antioxidants in pregnancyinduced hypertension
(PIH) compared with healthy normal pregnant and non-pregnant as controls. 75 cases were studied of which 25 were normal healthy
controls (Group A), 25 healthy pregnant women (Group B) of third trimester and 25 were PIH (Group C) of the same trimester.
In PIH, malondialdehyde a lipid peroxidation product was significantly increased as compared to normal pregnant and non-pregnant
controls. The nonenzymatic antioxidants like reduced glutathione, Vitamin-E, Vitamin-C and Vitamin-A were significantly decreased
in normal pregnants as compared to controls. A further significant decrease was noticed in PIH compared to normal pregnants.
A significant negative correlation was detected between lipid peroxidation and non-enzymatic antioxidant levels. Our study
clearly indicates a relationship between elevated lipid peroxidation, decreased non-enzymatic antioxidant in PIH. The measurement
of non-enzymatic antioxidants in plasma may be useful predictor of the likely development of PIH. 相似文献