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Reconstructing past ocean pH-depth profiles 总被引:1,自引:0,他引:1
Measurement of boron isotope compositions in species of planktonic foraminifera that calcified their tests at different depths in the water column are used to reconstruct the pH profile of the upper water column of the tropical ocean. Results for five time windows from the middle Miocene to the late Pleistocene indicate pH-depth profiles similar to that of the modern ocean in this area, which suggests that this method may greatly aid in our understanding of the global carbon cycle. 相似文献
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ZF Ren ZP Huang JW Xu JH Wang P Bush MP Siegal PN Provencio 《Science (New York, N.Y.)》1998,282(5391):1105-1107
Free-standing aligned carbon nanotubes have previously been grown above 700 degreesC on mesoporous silica embedded with iron nanoparticles. Here, carbon nanotubes aligned over areas up to several square centimeters were grown on nickel-coated glass below 666 degreesC by plasma-enhanced hot filament chemical vapor deposition. Acetylene gas was used as the carbon source and ammonia gas was used as a catalyst and dilution gas. Nanotubes with controllable diameters from 20 to 400 nanometers and lengths from 0. 1 to 50 micrometers were obtained. Using this method, large panels of aligned carbon nanotubes can be made under conditions that are suitable for device fabrication. 相似文献
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Stable integration and expression of a cry1Ia gene conferring resistance to fall armyworm and boll weevil in cotton plants
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Isolation and characterization of chitinolytic rhizobacteria for the management of Fusarium wilt in tomato 总被引:1,自引:0,他引:1
Sixty-three chitinase producing rhizobacteria (CRB) were isolated from 57 rhizospheric soil samples of tomato (Lycopersicon esculentum Mill.) growing in different regions of Karnataka, India. Among these, 13 CRB isolates were selected based on their ability to produce chitinase, colonize roots of tomato seedlings and reduce Fusarium wilt incidence. Four of these isolates produced statistically higher levels of chitinase and also zone of clearance/colony size (CZ/CS) ratios. One Bacillus subtilis isolate (CRB20) substantially reduced the severity of Fusarium wilt under greenhouse conditions. Combined application of chitin or crude fungal cell wall (CFCW) along with this isolate, substantially enhanced the ability of the isolate to colonize tomato roots and reduced the severity of Fusarium wilt. Under greenhouse conditions, amendments of chitin and CFCW along with isolate CRB20 significantly enhanced plant height, fresh weight, number of fruits per plant and average weight of fruit compared to the untreated control. The study clearly established the significance of CRB isolates and chitin/CFCW amendment in promoting plant growth and suppression of Fusarium oxysporum, and indicated the possibility of their use for Fusarium wilt management in tomato cultivation. 相似文献
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Basvaraj C. Viraktamath Arremsetty S. Hariprasad Gouri S. Laha Mohammed I. Ahmed Podishetty Natarajkumar Mugalodi S. Ramesha Chirravuri N. Neeraja Sena M. Balachandran Nallathigal S. Rani Pippalla Balaji Suresh Kalidindi Sujatha Manish Pandey Gajjala Ashok Reddy Maganti S. Madhav Raman M. Sundaram 《Plant Breeding》2011,130(6):608-616
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Akkareddy Srividhya Lakshminarayana R. Vemireddy Sakile Sridhar Mudduluru Jayaprada Puram V. Ramanarao Arremsetty S. Hariprasad Hariprasad K. Reddy Ghanta Anuradha Ebrahimali Siddiq 《Journal of Crop Science and Biotechnology》2011,14(1):45-56
Moisture stress is the major constraint to rice production and its stability in rainfed, mainly irrigated, and aerobic environments.
Identification of genomic regions conferring tolerance to stress would improve our understanding of the genetics of stress
response and result in the development of drought tolerant cultivars. In the present study, quantitative trait loci for drought
response related traits and as well as grain yield were identified using a set of 140 recombinant inbred lines derived from
a cross between the popular high-yielding variety, IR64 and the landrace, INRC10192. A total of 36 QTL were identified for
grain yield and its components under control and stress conditions. Strikingly, a QTL cluster flanked by the markers RM38
and RM331 on chromosome 8 was found to be associated with grain yield, plant height, no. of productive tillers, chaffy grains,
and spikelet fertility on secondary rachis and biomass under stress treatment. The genomic regions associated with these QTL
under drought stress will be useful for the development of marker-based breeding for drought tolerant, high-yielding varieties
suited to drought-prone areas. 相似文献