Effect of CIPC [Isopropyl-N(3-chlorophenyl)carbamate] on total nitrogen content and polyphenol oxidase activity in relation to processing of potatoes (Solanum tuberosum L.) stored under different conditions     

K. S. Randhawa  D. S. Khurana  K. L. Bajaj 《Plant foods for human nutrition (Dordrecht, Netherlands)》1986,36(3):207-212

Two varieties of potatoes viz. Kufri Chandramukhi and Kufri Sindhuri were treated with Isopropyl-N(3-chlorophenyl)carbamate at two different concentrations viz. 4000 and 5000 ppm. The treated potatoes were stored for a period of four months under different storage conditions i.e. room temperature, cold and evaporative cooling chamber storage and analysed for polyphenol oxidase activity, total nitrogen content and quality of dried slices produced from these at different stages of storage. Higher nitrogen content was observed in CIPC treated potatoes as compared to control. Polyphenol oxidase activity decreased more in Kufri Chandramukhi than in Kufri Sindhuri in CIPC treated as well as in control experiments. The changes in nitrogen content and polyphenol oxidase activity were more pronounced in evaporating cooling chamber and in room storage than in the cold storage. The quality of potato slices prepared from both varieties confirmed the superiority of Kufri Chandramukhi over Kufri Sindhuri for processing purposes.  相似文献   

Short term effect of applied nitrate on nitrogen metabilism of Acacia catechu seedlings     

U. Thakur  D. K. Khurana  A. K. Nath 《New Forests》1996,12(1):1-9

Nitrogen metabolism of Acacia catechu seedlings was studied after 5, 10 and 15 days of daily 20 mM nitrate application. Fresh weight of shoots and total nitrogen content of the plants increased significantly with applied nitrate but there was no effect on nodulation. An increase in the nitrate reductase activity, nitrate and nitrite content in nodules and leaves of the treated plants was also observed. However, the total soluble protein content declined and the amino acid content increased in different parts of the treated plants.  相似文献   

Constitutive expression of a phenylalanine ammonia-lyase gene from Stylosanthes humilis in transgenic tobacco leads to enhanced disease resistance but impaired plant growth     

Heather M. Way  Kemal Kazan  Neena Mitter  Kenneth C. Goulter  Robert G. Birch  John M. Manners   《Physiological and Molecular Plant Pathology》2002,60(6):275

Transgenic tobacco plants expressing a phenylalanine ammonia-lyase cDNA (ShPAL), isolated from Stylosanthes humilis, under the control of the 35S promoter of the cauliflower mosaic virus were produced to test the effect of high level PAL expression on disease resistance. The transgenic plants showed up to eight-fold PAL activity and were slowed in growth and flowering relative to non-transgenic controls which have segregated out the transgene. The expression of the ShPAL transgene and elevated PAL levels were correlated and stably inherited. In T₁ and T₂ tobacco plants with increased PAL activity, lesion expansion was significantly reduced by up to 55% on stems inoculated with the Oomycete pathogen Phytophthora parasitica pv. nicotianae. Lesion area was significantly reduced by up to 50% on leaves inoculated with the fungal pathogen Cercospora nicotianae. This study provides further evidence that PAL has a role in plant defence.  相似文献   

Magnetic Field Signatures Near Galileo's Closest Approach to Gaspra     

Kivelson MG  Bargatze LF  Khurana KK  Southwood DJ  Walker RJ  Coleman PJ 《Science (New York, N.Y.)》1993,261(5119):331-334

Two large magnetic field rotations were recorded by the spacecraft Galileo 1 minute before and 2 minutes after its closest approach to the asteroid Gaspra. The timing and the geometry of the field changes suggest a connection with Gaspra, and the events can be interpreted as the result of the draping of the solar wind field around a magnetospheric obstacle. Gaspra's surface field is inferred to be within an order of magnitude of Earth's surface field, and its magnetic moment per unit mass is in the range observed for iron meteorites and highly magnetized chondrites. The location of the magnetic signatures suggests that perturbations are carried by waves in the magnetosonic-whistler mode with wavelengths between electron and ion gyro radii.  相似文献   

Cassini magnetometer observations during Saturn orbit insertion     

Dougherty MK  Achilleos N  Andre N  Arridge CS  Balogh A  Bertucci C  Burton ME  Cowley SW  Erdos G  Giampieri G  Glassmeier KH  Khurana KK  Leisner J  Neubauer FM  Russell CT  Smith EJ  Southwood DJ  Tsurutani BT 《Science (New York, N.Y.)》2005,307(5713):1266-1270

Cassini's successful orbit insertion has provided the first examination of Saturn's magnetosphere in 23 years, revealing a dynamic plasma and magnetic environment on short and long time scales. There has been no noticeable change in the internal magnetic field, either in its strength or its near-alignment with the rotation axis. However, the external magnetic field is different compared with past spacecraft observations. The current sheet within the magnetosphere is thinner and more extended, and we observed small diamagnetic cavities and ion cyclotron waves of types that were not reported before.  相似文献   

Bovine brucellosis – a comprehensive review     

Sandip Kumar Khurana  Anju Sehrawat  Ruchi Tiwari  Minakshi Prasad  Baldev Gulati  Muhammad Zubair Shabbir  Rajesh Chhabra  Kumaragurubaran Karthik  Shailesh Kumar Patel  Mamta Pathak  Mohd. Iqbal Yatoo  Vivek Kumar Gupta  Kuldeep Dhama  Ranjit Sah  Wanpen Chaicumpa 《The Veterinary quarterly》2021,41(1):61

Brucellosis is a zoonotic disease of great animal welfare and economic implications worldwide known since ancient times. The emergence of brucellosis in new areas as well as transmission of brucellosis from wild and domestic animals is of great significance in terms of new epidemiological dimensions. Brucellosis poses a major public health threat by the consumption of non-pasteurized milk and milk products produced by unhygienic dairy farms in endemic areas. Regular and meticulous surveillance is essentially required to determine the true picture of brucellosis especially in areas with continuous high prevalence. Additionally, international migration of humans, animals and trade of animal products has created a challenge for disease spread and diagnosis in non-endemic areas. Isolation and identification remain the gold standard test, which requires expertise. The advancement in diagnostic strategies coupled with screening of newly introduced animals is warranted to control the disease. Of note, the diagnostic value of miRNAs for appropriate detection of B. abortus infection has been shown. The most widely used vaccine strains to protect against Brucella infection and related abortions in cattle are strain 19 and RB51. Moreover, it is very important to note that no vaccine, which is highly protective, safe and effective is available either for bovines or human beings. Research results encourage the use of bacteriophage lysates in treatment of bovine brucellosis. One Health approach can aid in control of this disease, both in animals and man.  相似文献   

Rhizobium sp. exopolysaccharide production,nodulation, and acetylene reduction activity (N2-fixation) in pigeon pea (Cajanus cajan L.)     

S. K. Singh  S. S. Dudeja  A. L. Khurana 《Biology and Fertility of Soils》1991,11(1):30-33

Summary There was no correlation between the quantity of exopolysaccharide produced and acetylene reduction activity by Rhizobium spp. or by Bradyrhizobium spp. (Cajanus). The exopolysaccharide-defective mutants of Rhizobium sp. strain P 116 either failed to nodulate or showed a decrease in effectiveness. The deficiency in exopolysaccharide production was corrected by the addition of purified exopolysaccharide from the parent strain, or from Bradyrhizobium sp. strain P 149 or S24 isolated from pigeonpea (Cajanus cajan) and mungbean (Vigna radiata), respectively. However, the nodules so formed were not fully effective compared to those formed by the parent strain.  相似文献   

QTL analysis for grain weight in common wheat   总被引：6，自引：0，他引：6  

Neeraj Kumar  Pawan L. Kulwal  Anupama Gaur  Akhilesh K. Tyagi  Jitendra P. Khurana  Paramjit Khurana  Harindra S. Balyan  Pushpendra K. Gupta 《Euphytica》2006,151(2):135-144

Quantitative trait loci (QTL) analysis for grain weight (GW = 1000 grain weight) in common wheat was conducted using a set of 100 recombinant inbred lines (RILs) derived from a cross ‘Rye Selection 111 (high GW) × Chinese Spring (low GW)’. The RILs and their two parental genotypes were evaluated for GW in six different environments (three locations × two years). Genotyping of RILs was carried out using 449 (30 SSRs, 299 AFLP and 120 SAMPL) polymorphic markers. Using the genotyping data of RILs, framework linkage maps were prepared for three chromosomes (1A, 2B, 7A), which were earlier identified by us to carry important/major genes for GW following monosomic analysis. QTL analysis for GW was conducted following genome-wide single marker regression analysis (SMA) and composite interval mapping (CIM) using molecular maps for the three chromosomes. Following SMA, 12 markers showed associations with GW, individual markers explaining 6.57% to 10.76% PV (phenotypic variation) for GW in individual environments. The high grain weight parent, Rye Selection111, which is an agronomically superior genotype, contributed favourable alleles for GW at six of the 12 marker loci identified through SMA. The CIM identified two stable and definitive QTLs, one each on chromosome arms 2BS and 7AS, which were also identified through SMA, and a third suggestive QTL on 1AS. These QTLs explained 9.06% to 19.85% PV for GW in different environments. The QTL for GW on 7AS is co-located with a QTL for heading date suggesting the occurrence of a QTL having a positive pleiotropic effect on the two traits. Some of the markers identified during the present study may prove useful for marker-assisted selection, while breeding for high GW in common wheat.  相似文献   

The dust halo of Saturn's largest icy moon, Rhea     

Jones GH  Roussos E  Krupp N  Beckmann U  Coates AJ  Crary F  Dandouras I  Dikarev V  Dougherty MK  Garnier P  Hansen CJ  Hendrix AR  Hospodarsky GB  Johnson RE  Kempf S  Khurana KK  Krimigis SM  Krüger H  Kurth WS  Lagg A  McAndrews HJ  Mitchell DG  Paranicas C  Postberg F  Russell CT  Saur J  Seiss M  Spahn F  Srama R  Strobel DF  Tokar R  Wahlund JE  Wilson RJ  Woch J  Young D 《Science (New York, N.Y.)》2008,319(5868):1380-1384

Saturn's moon Rhea had been considered massive enough to retain a thin, externally generated atmosphere capable of locally affecting Saturn's magnetosphere. The Cassini spacecraft's in situ observations reveal that energetic electrons are depleted in the moon's vicinity. The absence of a substantial exosphere implies that Rhea's magnetospheric interaction region, rather than being exclusively induced by sputtered gas and its products, likely contains solid material that can absorb magnetospheric particles. Combined observations from several instruments suggest that this material is in the form of grains and boulders up to several decimetres in size and orbits Rhea as an equatorial debris disk. Within this disk may reside denser, discrete rings or arcs of material.  相似文献   

Evidence of a global magma ocean in Io's interior     

Khurana KK  Jia X  Kivelson MG  Nimmo F  Schubert G  Russell CT 《Science (New York, N.Y.)》2011,332(6034):1186-1189

Extensive volcanism and high-temperature lavas hint at a global magma reservoir in Io, but no direct evidence has been available. We exploited Jupiter's rotating magnetic field as a sounding signal and show that the magnetometer data collected by the Galileo spacecraft near Io provide evidence of electromagnetic induction from a global conducting layer. We demonstrate that a completely solid mantle provides insufficient response to explain the magnetometer observations, but a global subsurface magma layer with a thickness of over 50 kilometers and a rock melt fraction of 20% or more is fully consistent with the observations. We also place a stronger upper limit of about 110 nanoteslas (surface equatorial field) on the dynamo dipolar field generated inside Io.  相似文献