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Watve, Milind
- Crop Damage by Wild Herbivores:Insights Obtained from Optimization Models
Abstract Views :247 |
PDF Views:71
Authors
Affiliations
1 Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411 008, IN
2 Department of Ecology and Environmental Sciences, Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, IN
1 Indian Institute of Science Education and Research, Homi Bhabha Road, Pashan, Pune 411 008, IN
2 Department of Ecology and Environmental Sciences, Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, IN
Source
Current Science, Vol 111, No 5 (2016), Pagination: 861-867Abstract
We constructed a theoretical model of cost-benefit optimization for farmers who face continued economic loss due to crop raiding by wild herbivores, as well as for the wild herbivores that do so. Insights obtained from the model include: (i) In sustenance agriculture, a farmer needs to optimize net benefit rather than benefit-to-cost ratio, whereas herbivores need to optimize the benefit-to-cost ratio. (ii) It is imperative for a farmer to disinvest from agricultural inputs when threatened by depredation. (iii) Many mitigation measures that are highly successful on an experimental scale are most likely to fail when used on a mass scale. (iv) The effectiveness of mitigation measures such as fencing, trenching and culling will be non-monotonic, being counterproductive under certain conditions.Keywords
Agricultural Economics, Cost–Benefit Optimization, Crop Depredation, Optimal Foraging, Wildlife Management.Full Text
- Polarity, Asymmetry and Aging:Are there Yayatis among Bacteria?
Abstract Views :263 |
PDF Views:74
Authors
Affiliations
1 Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411 008, IN
1 Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pune 411 008, IN
Source
Current Science, Vol 113, No 04 (2017), Pagination: 553-554Abstract
Bacteria have been shown to age. In an exponentially growing population some cells progressively slow down and stop dividing. This is thought to be due to asymmetric damage segregation in which old pole cells retain damaged components and the new pole cells receive newly synthesized components. Polarity implies functional asymmetry with a predefined direction with or without morphological difference. Cellular polarity and division asymmetry are common to yeast, bacteria and stem cells of multi-cell organisms. A number of processes in bacteria, including formation of endospores, flagella, stalks or buds show clear polar biases.Full Text
References
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- COVID-19: did preventive restrictions work?
Abstract Views :170 |
PDF Views:74
Authors
Affiliations
1 Abasaheb Garware College, Krave Road, Pune 411 004, IN
2 E-1-8, Girija Shankar Vihar, Karve Nagar, Pune 411 052, IN
1 Abasaheb Garware College, Krave Road, Pune 411 004, IN
2 E-1-8, Girija Shankar Vihar, Karve Nagar, Pune 411 052, IN
Source
Current Science, Vol 122, No 9 (2022), Pagination: 1081-1085Abstract
During the ongoing COVID-19 pandemic, if a preventive restriction (PR) intended to arrest transmission of the virus is effective, we expect a decrease in the rate of transmission. If an effective PR is lifted or relaxed, the reverse is expected. We test this expectation in the history of PR imposition and relaxation in all countries based on available public database using a null model of spontaneous change in the rate of transmission independent of PRs. We use the stringency index defined earlier and available in public database to represent PR in different countries at different times. We found no negative correlation between standing stringency index of PR and change in slope of the local curve. A change in stringency index was significantly negatively correlated with change in slope, but it could explain only 6.1% of the variance in rates of transmission. The distribution of slope changes after imposing versus after relaxing PRs was highly overlapping with only a tail consisting of 4.5% PR impositions being clearly non-overlapping with PR relaxation. Non-parametrically, only 5.9% of PR impositions were associated with a reduction in the slope above the expectation of a null hypothesis. Globally, PRs have played a small role in the pandemic up to March 2021. This feedback needs to be considered in making policies for disease prevention in the further course of the COVID-19 pandemic as well as in any future threats of respiratory disease epidemics.Keywords
COVID-19, epidemiology, lockdown, preventive restrictions, stringency index.Full Text
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