Generation of large-scale magnetic fields due to fluctuating α\alpha in shearing systems

We explore the growth of large-scale magnetic fields in a shear flow, due to helicity fluctuations with a finite correlation time, through a study of the Kraichnan-Moffatt model of zero-mean stochastic fluctuations of the $\alpha$ parameter of dynamo theory. We derive a linear integro-differential equation for the evolution of large-scale magnetic field, using the first-order smoothing approximation and the Galilean invariance of the $\alpha$-statistics. This enables construction of a model that is non-perturbative in the shearing rate $S$ and the $\alpha$-correlation time $\tau_\alpha$. After a brief review of the salient features of the exactly solvable white-noise limit, we consider the case of small but non-zero $\tau_\alpha$. When the large-scale magnetic field varies slowly, the evolution is governed by a partial differential equation. We present modal solutions and conditions for the exponential growth rate of the large-scale magnetic field, whose drivers are the Kraichnan diffusivity, Moffatt drift, Shear and a non-zero correlation time. Of particular interest is dynamo action when the $\alpha$-fluctuations are weak; i.e. when the Kraichnan diffusivity is positive. We show that in the absence of Moffatt drift, shear does not give rise to growing solutions. But shear and Moffatt drift acting together can drive large scale dynamo action with growth rate $\gamma \propto |S|$.Comment: 19 pages, 4 figures, Accepted in Journal of Plasma Physic

Issues, Concerns and Directions for Improving the Quality of Higher Education in India

The higher education system in India has undergone a huge change since independence. It has long been defined by its rote-learning method and textbook-centric teaching. The archaic learning pattern has been blamed for taking away creative thinking from the young minds which makes them hesitant from embracing creative careers. There have been some changes in the education system in the recent years, like the CBSE’s introduction of art-integrated courses. Higher education system in India is one of the world’s largest systems of education in terms of students, which has a great potential to compete with global universities. It is one of the key drivers of growth performance, prosperity, and competitiveness in national and global economies. Education empowers minds that will be able to conceive good thoughts and ideas as it is the key to success in life, and teachers make a long lasting impact. It has been widely acknowledged that no country can alleviate poverty, achieve sustainable economic development and produce skilled human resources without substantial investment in human capital. This study aims to highlight the challenges and the opportunities in higher education system in India and to analyses the various factors which are important for a country to provide word-class education with international norms. It takes stock of the initiatives taken by the government to improve the standards of higher education. Keywords: Education, Opportunities, Challenges, Governance, Development, Colleges, Universities DOI: 10.7176/JEP/11-22-03 Publication date:August 31st 202

Effect of plastic low tunnel and mulch type on soil temperature, growth, earliness and yield of brinjal under net-house and open field in plains of North-Western India

A two-year study was conducted to compare the performance of brinjal hybrid BH-2 using paddy straw mulch @ 6 t ha-1, clear plastic mulch (25 μm), black plastic mulch (25 μm), plastic low tunnel and control (bare soil) under net-house and open field at Punjab Agricultural University, Ludhiana, India. The maximum increase in morning and afternoon soil temperature over bare soil was observed using black plastic mulch followed by clear plastic mulch in both net-house and open field whereas paddy straw mulch reduced the soil temperature over bare soil in open field. Under net house, black and clear plastic mulch were better than other treatments and recorded maximum plant height (50.8 cm and 43.7 cm), number of leaves/plant (64.8 and 64.3), early yield (7.1 and 6.6 t ha-1), number of fruits/plant (16.1 and 14.4) and total yield (57.4 and 55.7 t ha-1), respectively. In open field, plastic low tunnel was the best treatment and recorded maximum plant height (40.4 cm), number of leaves/plant (51.2), early yield (5.9 t ha-1), number of fruits/ plant (14.6) and total yield (58.5 t ha-1). The study offers the scope of enhancing brinjal production in spring and early summer which may be highly profitable for farmers

Role of Cyclonic Eddy in enhancing Primary and New production in the Bay of Bengal

Highlights: • First direct measurements of new production in an eddy in the Bay of Bengal. • 100% increase in nutrient concentrations is seen due to the eddy. • Eddy enhanced new and primary production in the otherwise less productive Bay of Bengal. Abstract: Eddies can be important in sustaining primary production in the tropical oceans, but their role for nutrient cycling is poorly understood in the under-sampled northern Indian Ocean. To assess the role of cyclonic eddies in enhancing primary production, measurements of primary production were carried out at four stations in the northern Bay of Bengal during the early winter 2007, around a cyclonic eddy close to 17.8 °N, 87.5 °E. Shallowing of the thermocline and halocline by 10 m was observed within the eddy compared to the surroundings; mixed layer depth was also reduced within the eddy. The highest surface productivity (2.71 μM C d− 1) and chlorophyll a (0.18 μg L− 1) were found within the eddy, while the lowest, at its outer edge. Further, the eddy supplied nutrients to the surface layers, shallowing the subsurface chlorophyll maximum as well. Integrated production in the euphotic top layers was more than twice within eddy compared to its outer edge, confirming the role of cyclonic eddies in enhancing the primary production in the otherwise less productive Bay of Bengal. Given new nitrogen input via vertical mixing, river discharge or aerosol deposition, the additional primary production due to this new nutrient input and its contribution to the total production (f-ratio, fraction of exportable organic matter) increased significantly from 0.4 to 0.7, and thus the Bay of Bengal can potentially transfer a high fraction of its total production to the deep, assisted by eddies. We suggest possible improvements in experiments for future studies, and the potential for assessing the role of eddies in biogeochemistry

Flexible intramedullary nails: the panacea for paediatric femoral shaft fractures

Background: Management of pediatric femoral shaft fractures continues to evolve with time with flexible intramedullary nailing being one of the options to treat a specific age group of children. Grey zone exists concerning the cost effectiveness and appropriate timing of nail removal in treating such fractures. The objective of the study was to evaluate the treatment outcome of fracture shaft of the femur in children in the age group of 5- 12 years with flexible intramedullary nail.Methods: The study comprised of 30 consecutive cases of acute fractures of the femoral shaft in children of the age group of 5 to 12 years. Only closed fractures of the mid-diaphyseal region of the femur were included while supracondylar, subtrochanteric and pathological fractures were excluded. Flexible intramedullary nails of stainless steel (n=24) or titanium (n=6) were used for fixation of these fractures.Results: Evaluation of the results was done according to the criteria by Flynn et al. 21(70%) out of 30 patients had an excellent result and remaining 9 (30%) had a satisfactory result. All fractures united with a full range of motion at the hip and knee joint without any major complications. Conclusions: Intramedullary elastic nailing of simple diaphyseal femur fractures in children is an effective method with negligible complications. Treatment cost can be significantly lowered by using the much cheaper stainless steel flexible nails rather than the more expensive titanium nails

Dynamics of socio-economic factors affecting climate vulnerability and technology adoption: Evidence from Jodhpur district of Rajasthan

Climate change and extreme weather fluctuations are the most threatening challenges to the farming communities especially in semi-arid tropics. The paper investigates socio-economic factors affecting vulnerability and adoption of innovations using micro-level survey data of 100 systematically selected farmers in the Jodhpur district of Rajasthan, India. The results reveal that higher income, irrigation and provision of seeds reduce climate vulnerability to a great extent. Several farm level strategies have been adopted by the farmers against climate induced stress, including change in cropping pattern, reduction in irrigation usage, use of drips and sprinklers and water conservation. In case of pearl millet cropping system, we found that adoption of wide row spacing is significantly influenced by the level of the farmer’s education, land size category, climate awareness and trainings programs. The study suggests that diversified crop sequence involving pearl millet-wheat-cluster bean-barley-onion, farmers’ adoption of suitable adaptation strategies and climate resilient technologies will improve with better awareness, education and farm governance with regard to climate change. Moreover, technologies especially indigenous ones suitable to the local contextual needs must be developed or fine-tuned and disseminated for reducing climate-induced vulnerability

Therapeutic Strategies and Biomarkers to Modulate PARP Activity for Targeted Cancer Therapy

Poly-(ADP-ribose) polymerase 1 (PARP1) is commonly known for its vital role in DNA damage response and repair. However, its enzymatic activity has been linked to a plethora of physiological and pathophysiological transactions ranging from cellular proliferation, survival and death. For instance, malignancies with BRCA1/2 mutations heavily rely on PARP activity for survival. Thus, the use of PARP inhibitors is a well-established intervention in these types of tumors. However, recent studies indicate that the therapeutic potential of attenuating PARP1 activity in recalcitrant tumors, especially where PARP1 is aberrantly overexpressed and hyperactivated, may extend its therapeutic utility in wider cancer types beyond BRCA-deficiency. Here, we discuss treatment strategies to expand the tumor-selective therapeutic application of PARP inhibitors and novel approaches with predictive biomarkers to perturb NAD+ levels and hyperPARylation that inactivate PARP in recalcitrant tumors. We also provide an overview of genetic alterations that transform non-BRCA mutant cancers to a state of “BRCAness” as potential biomarkers for synthetic lethality with PARP inhibitors. Finally, we discuss a paradigm shift for the use of novel PARP inhibitors outside of cancer treatment, where it has the potential to rescue normal cells from severe oxidative damage during ischemia-reperfusion injury induced by surgery and radiotherapy

Assessing the Impacts of Climate Change on Crop Yields in Different Agro-climatic Zones of India

The study attempts to estimate and predict climate impact on crop yields using future temperature projections under two climate emissions scenarios of RCP 4.5 and 8.5 for three different time periods (2030s, 2050s and 2080s) across Agro-climatic zones (ACZ) of India. During the period 1966-2011, a significant rise was observed in both the annual mean maximum and minimum temperature across ACZs. Rainfall recorded an annual decline in Himalayan Regions and Gangetic Plains and a rise in Coastal Regions, Plateau & Hills and Western Dry Region. Our results showed high heterogeneity in climate impact on kharif and rabi crop yields (with both negative and positive estimates) across ACZs. It was found that rainfall had a positive effect on most of crop yields, but was not sufficient enough to counterbalance the impact of temperature. Changes in crop yield were more pronounced for higher emission scenario of RCP 8.5. Thus, it was evident that the relative impacts of climate change and the associated vulnerability vary by ACZs, hence comprehensive crop and region-specific adaptation measures should be emphasized that helps in enhancing resilience of agricultural system in short to medium term