708 research outputs found
Determination of Toxicity of some Fungal Metabolites on Seed Germination and Pigment Leaching
Get PDFIn present investigation, eighteen fungi were isolated on Potato Dextrose Agar and Rose Bengal Agar medium from abnormal soybean seeds. Out of these eighteen fungi, ten dominant fungi were selected to study the toxic potentialities of culture filtrate of these ten fungi on oilseeds germination, pigment leaching i.e. chlorophyll of spinach and betalain of beet root. Maximum loss of chlorophylls was caused due to toxins of Aspergillus niger, Aspergillus flavus and Penicillium notatum. Fusarium oxysporum caused minimum loss of chlorophylls. Aspergillus niger and Alternaria dianthicola was responsible for maximum leaching of betalain pigment while Curvularia lunata causes minimum leaching of pigment.---Seed Pathology and Fungal Biotechnology Laboratory, Department of Botany, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad- 431004(M.S.) India  ---Please Cite This Article As: Rajendra B. Kakde and Ashok M. Chavan. 2010. Determination of Toxicity of some Fungal Metabolites on Seed Germination and Pigment Leaching. J. Ecobiotechnol. 2(6):46-55.Â
Extra- cellular Pectinase Activity of Post-harvest Fungi from Papaya Fruits in Presence of Different Influencing Factors
Get PDFThe present paper deals with the study of pectinase enzyme activity of post-harvest fungi of papaya fruits under the influence of nutritional factors, antibiotics, vitamins and fungicides. It was found that carboxy methyl cellulose (CMC), sodium sulphate; ferrous sulphate, barium chloride, sodium chloride, magnesium chloride, zinc, ferrous, manganese, copper, barium, fungicides and ampicillin inhibits the pectinase action of all tested post-harvest fungi while other factors induces the same. --------------------------------------------------------------------------------------------------------1Dept. of Botany, Shrikrishna Mahavidyalaya, Gunjoti, Dist Osmanabad, Aurangabad; 2Seed pathology and Fungal Biotechnology Laboratory, Dept. of Botany, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad- 431 004. (M.S.) India.* Corresponding Author, Email: [email protected] Please Cite This Article As: G.M. Rathod and Ashok M. Chavan. 2010. Extra- cellular Pectinase Activity of Post-harvest Fungi from Papaya Fruits in Presence of Different Influencing Factors. J. Exp. Sci. 1(2): 07-11
Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
Get PDFUnderstanding the fundamental mechanisms governing vapor condensation on non-wetting surfaces is crucial to a wide range of energy and water applications. In this thesis, we reconcile classical droplet growth modeling barriers by utilizing two-dimensional axisymmetric numerical simulations to study individual droplet heat transfer on non-wetting surfaces (90° < θ_a < 170°). Incorporation of an appropriate convective boundary condition at the liquid vapor interface reveals that the majority of heat transfer occurs at the three phase contact line, where the local heat flux can be up to 4 orders of magnitude higher than at the droplet top. Droplet distribution theory is incorporated to show that previous modeling approaches under predict the overall heat transfer by as much as 300% for dropwise and jumping-droplet condensation. To verify our simulation results, we study condensed water droplet growth using optical and ESEM microscopy on bi-philic samples consisting of hydrophobic and nanostructured superhydrophobic regions, showing excellent agreement with the simulations for both constant base area and constant contact angle growth regimes. Our results demonstrate the importance of resolving local heat transfer effects for the fundamental understanding and high fidelity modeling of phase change heat transfer on non-wetting surfaces.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01The student, Shreyas Chavan, accepted the attached license on 2016-04-25 at 17:05.The student, Shreyas Chavan, submitted this Thesis for approval on 2016-04-25 at 17:16.This Thesis was approved for publication on 2016-04-27 at 09:11.DSpace SAF Submission Ingestion Package generated from Vireo submission #9489 on 2016-07-07 at 13:50:52Made available in DSpace on 2016-07-07T20:35:15Z (GMT). No. of bitstreams: 2
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No full textPhase change phenomena on water repelling and biphilic surfaces
Get PDFThis Dissertation was approved for publication on 2019-04-10 at 09:54.Water-repelling surfaces have been studied for many decades. Hydrophobic and superhydrophobic surfaces are beneficial in phase change heat transfer applications, specifically during condensation because of the enhanced heat transfer and during freezing because of the anti-freezing properties. The current study is focused on enhanced phase change phenomena on superhydrophobic and biphilic surfaces. Hydrophobic surfaces that enable dropwise condensation exhibit 5-10X higher heat transfer. Coalescence induced droplet jumping on superhydrophobic surfaces further increases the heat transfer by 30%. Here, biphilic surfaces consisting of hydrophilic spots on a superhydrophobic background are studied for enhanced condensation. Water droplets nucleating at the hydrophilic spots grow to sizes defined by the biphilic geometry, followed by coalescence and departure. A high fidelity model that captures departure dynamics during droplet jumping on biphilic surfaces and predict the overall condensation heat transfer has been developed. By controlling the spatial geometry and length scale of the hydrophilic spots, enhanced (10X) jumping-droplet condensation heat transfer is obtained.
In terms of freezing and frost formation, understanding the mechanisms of frost formation is essential to a variety of Heating, Ventilating, Air Conditioning and Refrigeration (HVAC&R) applications. When water vapor in the ambient condenses on a chilled substrate in the form of liquid water and then freezes, it is known as condensation frosting. The dominant mechanism governing the spread of condensation frosting is inter-droplet ice bridge frost wave propagation. When a subcooled condensate water droplet freezes on a hydrophobic or superhydrophobic surface, neighboring droplets still in the liquid phase begin to evaporate. The evaporated water molecules deposit on the frozen droplet and initiate the growth of ice bridges directed toward the water droplets being depleted. Neighboring liquid droplets freeze as soon as the ice bridge connects. In this study, the significance of individual droplet freezing on frost wave propagation is studied. 10X slower frost wave propagation speeds on superhydrophobic surfaces are observed. Furthermore, at larger length scales, during bulk freezing of water, it has been shown that superhydrophobic surfaces offer no delay in freezing.
Although frosting delay has been shown with superhydrophobic surfaces, complete elimination of frosting has not been achieved. Given enough time, frosting will initiate and spread to cover the entire surface. In the HVAC&R sectors, the most common approach to remove frost from a surface (defrost) is to reverse the system cycle direction and heat the working fluid. However, water retention on the heat exchanger surface during defrosting decreases the long term heat transfer performance. In this study, the defrosting behavior of superhydrophobic and biphilic surfaces comprising of spatially distinct superhydrophobic and hydrophilic domains is used to accelerate defrosting. During defrosting, biphilic surfaces are shown to exhibit enhanced surface cleaning with no water retention. Furthermore, an ultra-efficient method to defrost a surface covered with ice/frost by focusing energy at the substrate-ice interface is studied. To remove ice/frost efficiently, only the interfacial layer adhering the ice/frost to the solid surface is melted by using a localized ‘pulse’ of heat, allowing gravity or gas shear in conjunction with the ultra-thin lubricating melt water layer to remove the ice/frost. A high fidelity numerical model is developed to simulate pulse defrosting. This work not only provides a fundamental understanding of phase change processes on superhydrophobic and biphilic surfaces, but also elucidates its applications for a plethora of energy industries.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01The student, Shreyas Chavan, accepted the attached license on 2019-04-09 at 16:13.The student, Shreyas Chavan, submitted this Dissertation for approval on 2019-04-09 at 16:16.DSpace SAF Submission Ingestion Package generated from Vireo submission #13540 on 2019-08-22 at 16:20:55Made available in DSpace on 2019-08-23T20:44:41Z (GMT). No. of bitstreams: 2
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Incidence of Powdery Mildew on Cucurbit Plants and its Ecofriendly Management
Get PDFPresent paper deals with the study of powdery mildew incidence on different cucurbits hosts in different seasons and its biocontrol. In Kharif season Sphaerotheca fuliginea was dominantly present on Cucurbita maxima, Lageneria siceraria and Cucurbita pepo, where as Erysiphe cichoracearum noted on Citrullus lanatus was not reported in 2005 and 2006.Cucurbita maxima, Lageneria siceraria, Luffa acutangula and Luffa cylindrica showed maximum occurrence of Sphaerotheca fuliginea in the rabbi season. Incidence of powdery mildew was mainly reported on the mature leaves followed by stem. Where as in some cases it was reported on tendril, flower and fruit. Dominant association of powdery mildew was mainly reported on basal leaf. However the incidence of powdery mildew was less on the younger leaves of cucurbits. Incidence of powdery mildew is more at post flowering and fruiting stage. However powdery mildew also reported at seedling stage of Cucurbita pepo and Cucurbita maxima. Neem leaf extract at15% concentration, Parthenium leaf at 10% concentrations. Ocimum leaf at 20% concentration, Citrus leaf at 20% concentration, Annona squamosa leaf at 10% concentration, Ipomea at 15% and Jowar leaf at 20% control the powdery mildew of cucurbits. Cow urine at 15% concentration proved to be effective to control powdery mildew on cucurbit. 20% to 25% of Butter milk spray successfully controlled the powdery mildew of cucurbit. Similarly 20% ash spray also found to be successful to control the growth of powdery mildew of cucurbits. Spray of Dashparni ark, a bi-product of plant and animal at 10% concentration inhibited the growth of Erysiphe cichoracearum and Sphaerotheca fuliginea.---1Department of Botany, ARTS and science college, Bhalod, tq. Yawal, Dist. Jalgaon (M.S.), India2Seed Pathology and Fungal Biotechnology Laboratory, Department of Botany, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad- 431004 (M.S.), India ---Please Cite This Article As: Vasant P. Pawar and Ashok M. Chavan. 2010. Incidence of Powdery Mildew on Cucurbit Plants and its Ecofriendly Management. J. Ecobiotechnol. 2(6):29-43.Â
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