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Raghavendra Gadagkar 《Resonance》1996,1(1):63-70
Language is usually credited with being the major factor in making humans so different from other higher animals. The fact
that honey bees have a dance language that is unparalleled in the rest of the animal kingdom is therefore of great interest.
Successful forager bees communicate information about the source of food discovered by them, to their sisters upon returning
home. They do this by means of a round dance (which only says, there is food nearby) or a waggle dance which gives information
about the distance, direction and quantity of food to be expected. Karl Von Frisch bagged the Nobel Prize in 1973, mainly
for deciphering the dance language of honey bees. However there are some sceptics who believe that the dance that the foragers
do perform may have no communication value and that bees locate sources of food based on the scent left behind by the discoverer
on the way to and at the location of the food source. While bees can find food based on such odours, recent experiments, using
a robot bee, convincingly demonstrate that bees can also find food, in the absence of smell, on the basis of information communicated
through the dance language. 相似文献
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Raghavendra Gadagkar 《Resonance》2018,23(11):1243-1257
In this article, I will describe how a simple, curiosity-based experiment to understand how ants are smart enough to choose the shortest path led the exploration of self-organization and swarm-intelligence and resulted in major applications in computer science and optimization algorithms. The focus will be on curiosity, simplicity, interdisciplinarity, and being unmindful of immediate applications. 相似文献
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Raghavendra Gadagkar 《Resonance》2000,5(9):58-68
Admittedly, a great deal of all of this speculation remains to be tested, either by modelling or by experiments. But it is today’s speculation that will guide tomorrow’s research. If genomic imprinting turns out to be more common than is currently evident, then there is no escape from a major reexamination of many sociobiological predictions. And that would certainly cause a major turmoil or a great deal of excitement, depending on how you look at it! 相似文献
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Serum alkaline phosphatase (ALP) (EC 3.1.3.1), 5′nucleotidase (5′NT) (EC 3.1.3.5), aldolase (ALD) (EC 4.1.2.13) and sorbitol
dehydrogenase (SDH) (EC 1.1.1.14) were estimated in infective hepatitis, alcoholic hepatitis, chronic active hepatitis, obstructive
jaundice, cirrhosis of liver and amoebic liver abscess. It was observed that serum ALP and 5′NT were significantly increased
in all cases of chronic active hepatitis and obstructive hepatic disease. However, the elevation observed in the latter was
much higher than the former. Serum SDH and ALD levels were elevated in all cases of infective hepatitis, studied though increase
in the former was much higher than the latter, suggesting its significance in the diagnostic confirmation of this disease.
Results presented suggest 5′NT and SDH as more reliable diagnostic test compared to ALP and ALD for obstructive jaundice and
infective hepatitis respectively. 相似文献
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Vasavidevi V. Bet Kishor H. Deshpande Adinath N. Suryakar Rajesh D. Ankush Raghavendra V. Katkam 《Indian journal of clinical biochemistry : IJCB》2006,21(2):177-180
Crystal aggregation and retention are critical events for the formation of kidney stones. There is a close association between
crystal development and free radical activity in vivo. In the present study 30 subjects presenting with urolithiasis were
included. Serum levels of total lipid peroxides, nitric oxide (as nitrite), α-tocopherol, plasma ascorbic acid (vitamin C)
and erythrocyte superoxide dismutase activity were measured. These findings were compared with 30 age matched control subjects
irrespective of sex. Student's ‘t’ test was applied for statistical analysis. There was a significant increase in lipid peroxides
(p<0.001), where as significant decrease in nitrite (p<0.01) and α-tocopherol (p<0.001) levels were observed. Plasma ascorbate
(p>0.05) and erythrocyte superoxide dismutase activity (p>0.05) was also found to be decreased but the difference was not
statistically significant which suggests that oxidative stress is evident in urolithiasis with depletion in antioxidant status
where as decrease in nitric oxide may be less abetting in disease condition. 相似文献
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Raghavendra Gadagkar 《Resonance》2018,23(10):1101-1116
In the second article in the series, I will describe how the young Karl von Frisch, later to become another founding father of ethology and Nobel Laureate, defied established authority to design simple yet logically clever experiments to show that honey bees indeed have colour vision. His experiments forever changed our view of animals and also the way experiments in animal behaviour are designed. It might interest readers to know that Karl von Frisch’s experiments described in this part inspired Tinbergen’s experiments described in the previous article in this series. 相似文献
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A simple and inexpensive method of building a charge meter is discussed and as an application two experiments are suggested. A charge meter can be used for identification and measurement of charges on dielectric media such as teflon, nylon, silk and rubber balloon obtained by method of friction. Teflon and rubber balloon are found to be negatively charged while silk and nylon are found to be positively charged. A charge meter can also be used to measure capacitance of parallel plate capacitors and hence calculate dielectric constant of the medium between its plates. The values of dielectric constant of transparency plastic sheet and plain paper so obtained are 2.71 ± 0.08 and 4.8 ± 0.29. In the last part, the effective capacitance of a capacitor obtained by placing paper and transparency plastic sheet placed one above the other is shown to be equivalent to a series combination of individual paper and transparency plastic sheet capacitors. These experiments can be pedagogical tools for teaching electrostatics. 相似文献