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Search Results: 1 - 10 of 479675 matches for " L. S. Chauhan "
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Effect of Plant Geometry on Growth and Yield of Corn in the Rice-Corn Cropping System  [PDF]
Bhagirath S. Chauhan, Jhoana L. Ope?a
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410237
Abstract:

The rice-corn cropping system is increasing in Asia in response to increased demand of corn for feed. A field study was conducted to evaluate the effect of plant geometry (row and plant to plant spacing: 50 × 20, 50 × 30, 75 × 20, and 75 × 30 cm) on growth and yield of corn. Plant height and leaf production per plant were not influenced by the plant geometry. Spacing, however, influenced leaf area, aboveground shoot biomass, and yield of corn per unit area. Highest leaf area, shoot biomass, and yield (8.2 t·ha-1) were produced by plants grown at 50 × 20 cm spacing. The results of this study suggest that narrow rows and plant to plant spacing may increase grain yield by increasing crop growth rates. Plant geometry could be modified to improve yield of corn in the rice-corn cropping system, and thereby increase productivity of the system.

Effect of Plant Spacing on Growth and Grain Yield of Soybean  [PDF]
Bhagirath S. Chauhan, Jhoana L. Ope?a
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410251
Abstract:

In the Philippines, rice monoculture systems are common. Compared to these systems, the rice-soybean cropping system may prove more water-efficient and there is a trend of increasing soybean area in the response to water scarcity and need for crop diversification in the Philippines. A field study was conducted to evaluate the effect of row and plant to plant spacing (20 × 10, 20 × 5, 40 × 10, and 40 × 5 cm) on growth and yield of soybean. Plant height was not influenced by the plant geometry. Spacing, however, influenced leaf area and shoot biomass of soybean. Plants grown at the widest spacing (i.e., 40 × 10 cm) produced lowest leaf area and shoot biomass at 6 and 12 weeks after planting. Leaf area and shoot biomass at other three spacing were similar. There was a negative and linear relationship between weed biomass and crop shoot biomass at 6 and 12 weeks after planting. Grain yield of soybean was not affected by plant geometry and it ranged from 1.3 to 1.9 t·ha-1 at different spacing.

Management of Volunteer Corn Seedlings in Dry-Seeded Rice  [PDF]
Bhagirath S. Chauhan, Jhoana L. Ope?a
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412294
Abstract:

The demand for corn is increasing in Asia for feed and biofuel. It is grown in the rice-corn cropping system. During harvest of corn, however, seeds drop on the soil surface and become problems as volunteer corn seedlings in the subsequent dry-seeded rice crop, in which the suppressive effect of standing water is absent. A study was conducted in screenhouse and field conditions to evaluate the effect of rice herbicides on the management of volunteer corn seedlings. In the screenhouse experiment, bispyribac-sodium at 0.030 and 0.045 kg·ai·ha-1 provided complete control of corn seedlings. Fenoxaprop + ethoxysulfuron and penoxsulam + cyhalofop did not provide effective control of corn seedlings. In the field, the sole application of bispyribac and sequential application of oxadiazon and bispyribac suppressed corn biomass by 60%-82% and 89%-91%, respectively, as compared with the nontreated control. The results of this study demonstrate that, in the absence of other management strategies, volunteer corn seedlings in dry-seeded rice systems can be managed by using bispyribac-sodium.

ANTI-INFLAMMATORY ACTIVITY OF SOME SUBSTITUTED HYDROXYTRIAZENES
L S Chauhan
Journal of Global Pharma Technology , 2010, DOI: 10.1234/jgpt.v2i3.158
Abstract: To study the anti-inflammatory activity of some substituted hydroxytriazenes on carrageenan-induced hind paw edema and cotton pellet granuloma models in albino rats (Wister strain). The hind paw edema was produced by sub planter injection of carrageenan and the paw volume was measured plethysmographically after 0.5,1,2,3 & 5 hours. In sub-acute model, cotton pellet granuloma was produced by implanting 50 ± 1 mg sterile cotton in axilla under ether anesthesia. The animals were administered hydroxytriazenes (HD-1, HD-2, HD-3) dissolved in DMSO at dose (5 mg/kg) and diclofenac sodium (5 mg/kg), as standard drug. All hydroxytriazenes showed maximum inhibition of edema up to 1 h. After 1 h the parent compound HD-1 did not show any significant activity, but the other hydroxytriazenes HD-2 and HD-3 showed significant activity up to 5 h. In sub acute models, the hydroxytriazenes HD-2 and HD-3 exhibited significant activity by reducing the granuloma weights by 69.62% and 56.86% respectively Hydroxytriazenes (HD-2 and HD-3) show significant anti-inflammatory effect on both acute and sub acute inflammation.
EVALUATION OF CNS ACTIVITY OF HYDROXYTRIAZENES IN MICE
L S Chauhan
Journal of Global Pharma Technology , 2010, DOI: 10.1234/jgpt.v2i3.155
Abstract: Hydroxytriazene compounds (HD) were synthesized and the purity of each hydroxytriazene was checked by physical characteristics and elemental analysis. The synthesised hydroxytriazenes were studied on some CNS activity on mice like behavior, locomotion, sleep, and convulsions using standard procedures. The hydroxytriazenes exhibited reduced alertness, spontaneous locomotion activity and potentiate the pentobarbitone induced sleep. These compounds showed CNS depressant effects.
Inflammation Mediators: A Review
L. S. Chauhan,C. S. Chauhan,C. P. Jain
Pharmaceutical Reviews , 2006,
Abstract: The inflammatory process involves a series of events that can be elicitedby numerous stimuli and provokes a characteristic pattern of responses. Ata microscopic level, the familiar clinical signs of erythema, edema, tenderness,and pain usually accompany the response.A substance that causes one of the component events in inflammation througha specific receptor is called a mediator of inflammation. Both endogenousand exogenous substances may acts as mediators e.g. proteins, lipids, histamine,serotonin, nitric oxide, endotoxin, interleukins, tumor necrosis factors etc.
Rice Husk Biochar Influences Seedling Emergence of Junglerice (Echinochloa colona) and Herbicide Efficacy  [PDF]
Bhagirath S. Chauhan
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.47164
Abstract:

The use of carbonized rice husk biochar improves the fertility and productivity of poor soils in rice-based cropping systems. However, biochar may also influence weed seedling emergence and the efficacy of soil-applied herbicides. Experiments were conducted in a screenhouse to evaluate the effect of biochar rates (0, 20, 40, and 80 t·ha?1) and seed burial depth (0, 1, and 2 cm) on seedling emergence of junglerice (Echinochloa colona) and the effect of biochar rates and pendimethalin (0, 500, 1000, and 1500 g·a.i.·ha?1) and pretilachlor doses (0, 300, 600, and 900 g·a.i.·ha?1) on seedling emergence and seedling biomass of junglerice. Data were analyzed using nonlinear regression. The burial depth to inhibit 50% of maximum seedling emergence was 0.76 cm when biochar was not added to soil and the depth increased with an increase in biochar rates for soil. Similarly, compared with the soil with no biochar, the use of bichoar increased the pretilachlor dose to inhibit 50% of maximum emergence or biomass. The pretilachlor dose to inhibit 50% of maximum biomass of junglerice was 100, 130, 240, and

Seed Germination Ecology of Echinochloa glabrescens and Its Implication for Management in Rice (Oryza sativa L.)
Jhoana L. Ope?a, Bhagirath S. Chauhan, Aurora M. Baltazar
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0092261
Abstract: Echinochloa glabrescens is a C4 grass weed that is very competitive with rice when left uncontrolled. The competitive ability of weeds is intensified in direct-seeded rice production systems. A better understanding is needed of factors affecting weed seed germination, which can be used as a component of integrated weed management in direct-seeded rice. This study was conducted to determine the effects of temperature, light, salt and osmotic stress, burial depth, crop residue, time and depth of flooding, and herbicide application on the emergence, survival, and growth of two populations [Nueva Ecija (NE) and Los Ba?os (IR)] of E. glabrescens. Seeds from both populations germinated at all temperatures. The NE population had a higher germination rate (88%) from light stimulation than did the IR population (34%). The salt concentration and osmotic potential required to inhibit 50% of germination were 313 mM and ?0.24 MPa, respectively, for the NE population and 254 mM and ?0.33 MPa, respectively, for the IR population. Emergence in the NE population was totally inhibited at 4-cm burial depth in the soil, whereas that of the IR population was inhibited at 8 cm. Compared with zero residue, the addition of 5 t ha?1 of rice residue reduced emergence in the NE and IR populations by 38% and 9%, respectively. Early flooding (within 2 days after sowing) at 2-cm depth reduced shoot growth by 50% compared with non-flooded conditions. Pretilachlor applied at 0.075 kg ai ha?1 followed by shallow flooding (2-cm depth) reduced seedling emergence by 94?96% compared with the nontreated flooded treatment. Application of postemergence herbicides at 4-leaf stage provided 85?100% control in both populations. Results suggest that integration of different strategies may enable sustainable management of this weed and of weeds with similar germination responses.
Machinability Study of Titanium (Grade-5) Alloy Using Design of Experiment Technique  [PDF]
Kali Dass, S. R Chauhan
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.36073
Abstract: This paper presents the findings of an experimental investigation into the effects of cutting speed, feed rate, depth of cut and approach angle in turning of titanium (Grade 5) alloy. A two-level factorial experiment has been used to accomplish the objective of the experimental study. The main cutting force, i.e. tangential force (Fc) and surface roughness (Ra) were the response variables investigated. The experimental results indicate that the proposed mathematical models suggested could adequately describe the performance indicators within the limits of the factors that are being investigated. The feed, cutting speed and depth of cut is the most significant factor that influences the surface roughness and the tangential force. However, there are other factors that provide secondary contributions to the performance indicators.
Exacerbated metastatic disease in a mouse mammary tumor model following latent gammaherpesvirus infection
Vinita S Chauhan, Daniel A Nelson, Lopamudra Das Roy, Pinku Mukherjee, Kenneth L Bost
Infectious Agents and Cancer , 2012, DOI: 10.1186/1750-9378-7-11
Abstract: Mice latently infected with HV-68 had a similar primary tumor burden, but much greater metastatic disease, when compared to mock treated mice given the transplantable tumor, 4?T1. This was true for lung lesions, as well as secondary tumor masses. Increased expression of pan-cytokeratin and VEGF-A in tumors from HV-68 infected mice was consistent with increased metastatic disease in these animals. Surprisingly, no viral particles could be cultured from tumor tissues, and the presence of viral DNA or RNA transcripts could not be detected in primary or secondary tumor tissues.Latent HV-68 infection had no significant effect on the size of primary 4?T1 mammary tumors, but exacerbated the number of metastatic lung lesions and secondary tumors when compared to mock treated mice. Increased expression of the tumor marker, pan-cytokeratin, and VEGF-A in tumors of mice harboring latent virus was consistent with an exacerbated metastatic disease. Mechanisms responsible for this exacerbation are indirect, since no virus could be detected in cancerous tissues.
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