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Search Results: 1 - 10 of 224614 matches for " Kamlesh R. Chauhan "
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Synthesis of Southern Corn Rootworm Pheromone from S-Citronellol and Its Field Evaluation  [PDF]
Thangaiah Subramanian, Meiling Webb, Ganga Bhagavathy, Annett Rozek, Bheema Rao Paraselli, Kamlesh R. Chauhan
Journal of Agricultural Chemistry and Environment (JACEN) , 2016, DOI: 10.4236/jacen.2016.54023
Abstract: Southern rootworm (Diabrotica undecimpunctata howardi) affects several plants such as soybean, sorghum, wheat, cucumber, alfalfa, cucurbits and it is most damaging to corn and peanuts. The pheromone based “attract and kill” strategy is one of the powerful ways to control pest population. To address our key objective of the practical utility of the synthetic pheromone, we have developed a simple synthetic strategy to produce gram scale southern corn rootworm pheromone in nine simple steps starting from S-Citronellol. The present strategy takes advantage of the existing chiral center of commercially available S-Citronellol. To get the basic carbon skeleton of the pheromone, the main step in the synthetic strategy is coupling of aliphatic units through Wittig reaction. The phosphonium salt from a non-functionalized aliphatic bromide followed by Wittig reaction improved the overall yield in the multistep synthesis of this pheromone. The large-scale production of pheromone enabled us to test it in the field.
Phyto-Fungicides: Structure Activity Relationships of the Thymol Derivatives against Rhizoctonia solani  [PDF]
Kamlesh R. Chauhan, Thanh C. Le, Praveen Kumar Chintakunta, Dilip K. Lakshman
Journal of Agricultural Chemistry and Environment (JACEN) , 2017, DOI: 10.4236/jacen.2017.64012
Abstract: Thymol, the key component of the thyme oil and its derivatives were evaluated for their structure activity relationship as fungicide against Rhizoctonia solani. Since plant-based chemicals are considered as “Generally Recognized as Safe” (GRAS) chemicals, there is great potential to use those and synthetic derivatives against R. solani and other fungal pathogens, in vitro, and in the?greenhouse or field conditions. Among the six thymol derivatives evaluated, thymol acetate was considered as the most suitable commercially viable plant-based fungicide due to its superior efficacy as well as lowest residue.
Serendipitous, cross familial discovery of the first long-range chemical attractants for antlions (Neuroptera: Myrmeleontidae): (1R,2S,5R,8R)-Iridodial and Z,E-nepetalactol
Qing-He Zhang,Kamlesh R. Chauhan,Jeffrey R. Aldrich
Frontiers in Ecology and Evolution , 2014, DOI: 10.3389/fevo.2014.00080
Abstract: Synthetic (1R,2S,5R,8R)-iridodial, the key pheromone component of many green lacewings in the genus Chrysopa, strongly attracted adult males and females of the North American antlion, Dendroleon speciosus Banks. In addition, one of the common sex pheromone components of many aphids to which Chrysopa spp. are weakly attracted, Z,E-nepetalactol, was also weakly attractive to D. speciosus adults. Iridodial and Z,E-nepetalactol also elicited strong and weak electroantennogram detector (EAD) responses, respectively, in D. speciosus adults. Previously reported semiochemicals from European and Israeli antlion species did not elicit EAD or behavioral responses from D. speciosus adults. The earlier studied antlions release volatile chemicals from male-specific metathoracic glands associated with structures on the hind wings (Eltringham’s organs) that are thought to enhance evaporation of the secretion. Although D. speciosus males have Eltringham’s organs similar to those of other antlion species, we discovered that D. speciosus males have a pair of white tubular glands that extend posteriorly into the abdomen, opening in the resting pits of the Eltringham’s organs. Further gas chromatograph (GC)-EAD analysis of another commercially available antlion species, Myrmeleon crudelis Walker, showed that this species did not respond to the lacewing or aphid related volatile compounds, but strongly responded to the reported antlion semiochemicals, namely, nerol, 10-homonerol and nerol oxide. The male-specific abdominal glands of D. speciosus are presumably pheromone glands; hopefully, positive verification of this supposition will help clarify the semiochemical relationships between antlions, lacewings and aphids.
Need to suspect fungal etiology in presumed bacterial keratitis - A case report of keratitis due to Scedosporium prolificans
Lata R Chandel, Anuradha Sood, Smriti Chauhan, Kamlesh Thakur
Asian Journal of Medical Sciences , 2011, DOI: 10.3126/ajms.v2i1.4058
Abstract: We describe a case of keratitis with acute presentation and without any history of trauma caused by Scedosporium prolificans; a rare cause of fungal keratitis, from a tertiary care hospital. To the best of our knowledge this is the first such case reported from the region. Because of early diagnosis and prompt treatment the patient could be managed well.
Pheromone of the Banana-Spotting Bug, Amblypelta lutescens lutescens Distant (Heteroptera: Coreidae): Identification, Synthesis, and Field Bioassay
Ashot Khrimian,Harry A. C. Fay,Filadelfo Guzman,Kamlesh Chauhan,Chris Moore,Jeffrey R. Aldrich
Psyche , 2012, DOI: 10.1155/2012/536149
Abstract: The banana-spotting bug, Amblypelta lutescens lutescens Distant (Heteroptera: Coreidae), is one of the principal pests of tree fruits and nuts across northern and eastern Australia. Apart from visual damage assessment, there are currently no reliable methods for monitoring bug activity to aid management decisions. An attractant pheromone for this species that could be used as a trap lure could potentially fill this void. Earlier, two male-specific compounds were identified in airborne extracts from A. lutescens lutescens, (E,E)-α-farnesene and (R,E)-nerolidol; an unknown compound with a molecular weight 220 was also detected. We now report the identification of this hitherto unknown compound as (R,E,E)-α-farnesene-10,11-oxide. Synthesis of this epoxide was conducted using a regioselective asymmetric dihydroxylation of a sulfolene. A blend mimicking the natural proportions of (E,E)-α-farnesene, (R,E)-nerolidol, and (R,E,E)-α-farnesene-10,11-oxide attracted male and female A. lutescens lutescens as well as nymphs in the field, verifying that the aggregation pheromone comprises or is contained within this group of compounds. 1. Introduction The fruit-spotting bug, Amblypelta lutescens lutescens Distant (Heteroptera: Coreidae), commonly known as the banana-spotting bug, is one of the most important insect pests of fruit and nut crops in tropical and subtropical Australia [1–4]. Nymphs and adults feed on shoots and developing fruits of a wide range of commercial tree crops, causing significant production losses if pesticides are not regularly applied. Monitoring banana-spotting bug activity in crops is extremely difficult and currently relies on scouts assessing damage at weekly or fortnightly intervals throughout the season [5]. This approach is reactive and not always effective, as well as being time consuming and expensive since a large proportion of a crop must be monitored because damage can be unevenly distributed throughout an orchard. Alternative monitoring tools based on semiochemicals, such as host plant volatiles and/or pheromones, are highly desirable because they could potentially be more reliable and easier to standardize. Studying male-specific compounds from Nearctic and Australasian true bugs, Aldrich et al. identified (E,E)-α-farnesene and (R,E)-nerolidol from A. lutescens lutescens, whereas a third compound with molecular weight 220 remained unknown [6]. Blends of these chemicals could serve as an attractant pheromone for A. lutescens lutescens but their biological importance has not been demonstrated, nor has the structure of the unknown
A clinical study of effect of oral atenolol on normal intraocular pressure and systemic blood pressure
Chauhan Jugal,Mishra Y,Khilnani Kamlesh
Indian Journal of Ophthalmology , 1989,
Abstract: Atenolol is a newer betablocker, widely used as an antihypertensive drug. It cause a large and rapid fall in IOP when used orally and topically. A total of 33 patients both having normal and raised IOP were included in the study. The drug was given in a dose of 50 mg. tab. orally once a day for 7 days at 8 A.M. and IOP recorded after 24 hours, 72 hours and on 7th day. It produces significant and sustained fall in IOP in both normal and raised IOP patients besides lowering of systematic B.P. and pulse rate. The IOP on patients with systemic hypertension with Atenolol will be reduced and stoppage of therapy may cause glaucoma damage.
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.
Vidi, vini, vinci: External ophthalmomyiasis infection that occurred, and was diagnosed and treated in a single day: A rare case report
Thakur Kamlesh,Singh Gagandeep,Chauhan Smriti,Sood Anuradha
Oman Journal of Ophthalmology , 2009,
Abstract: Ophthalmomyiasis is an infestation of eye with larvae or maggots of certain flies. Oestrus ovis (sheep nasal botfly) belonging to family Oestridae is the most common cause of human myiasis. We describe here an acute presentation of a case of external ophthalmomyiasis, i.e., infestation of conjunctiva due to first instar larvae of Oestrus ovis. In this case report the occurrence, diagnosis and treatment all took place in the setting of a single day. Prompt treatment by removal of larvae mechanically followed by instillation of antibiotic and steroid eye drops helped to prevent serious complications. The taxonomic identification of fly is also important as some fly species are capable of penetrating deeper tissues of eyes, which is sight threatening.
New Cloud Detection Index (CDI) for Forecasting the Extreme Rain Events  [PDF]
Niket Shastri, Kamlesh Kamlesh Pathak
Advances in Remote Sensing (ARS) , 2019, DOI: 10.4236/ars.2019.81002

The water vapor content and clouds play a very significant role in atmospheric conditions. This paper is derived from the new cloud detection index (CDI) which is useful to forecast extreme weather events like heavy or extreme rain. The CDI is retrieved using two crucial elements of cloud formation, the critical humidity and critical water vapor. The cloud thickness is determined by using CDI for a radiosonde site (VABB) located in Mumbai, the western part of India. The obtained results are compared with the cloud thickness required for extreme rain. The outcome of the comparison is discussed in this paper. The cloud detection index is also useful in establishing the atmospheric stability along with another four atmospheric stability indices.

Cyclic Changes in the Hypothalamo-Neurohypophysial System of Xenentodon Cancila (Ham.)
Zahida Khuroo,R. Chauhan
Journal of Fisheries International , 2012, DOI: 10.3923/jfish.2012.65.69
Abstract: Hypothalamo-neurosecretory complex of Xenentodon cancila consists of Nucleus Preopticus (NPO), Nucleus Lateralis Tuberis (NLT) and their axonal tracts. NPO is a paired structure situated on either side of the third ventricle anterodorsal to the optic chiasma. NPO is divisible into a dorsal Pars Magnocellularis (PMC) consisting of large neurosecretory cells and Pars Parvocellularis (PPC) formed of smaller neurons. Neurons of PMC and PPC contribute beaded axons to form neurohypophysial tract. Herring bodies are seen in the anterior as well as posterior neurohypophysis.
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