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Girard JC, Noëll J, Larbre F, Roumagnac P, Rott P. First Report of Acidovorax avenae subsp. avenae Causing Sugarcane Red Stripe in Gabon. Plant Dis 2014; 98:684. [PMID: 30708509 DOI: 10.1094/pdis-09-13-0914-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
During a disease inspection at the sugarcane estate SUCAF near Franceville, Gabon, in March 2011, 1- to 3-mm wide and several dm long dark red stripes were observed on sugarcane (Saccharum spp.) leaves of many plants of cultivar R570. These plants were 5.5 months old in the first ratoon crop. Additionally, spindle leaves of several stalks were rotted and could be easily pulled out of the top of the stalk. Longitudinal sections of diseased stalks showed reddish-brown discoloration of the upper stem and the rotted spindle had an unpleasant odor. Circular, convex, smooth, yellow-cream pigmented bacterial colonies with 2 to 3 mm diameter were isolated after 3 days at 28°C from young leaf lesions on YPGA (yeast extract 7 g/L, peptone 7 g/L, glucose 7 g/L, agar 15 g/L, pH 6.8 to 7.0). The 16S-23S internal transcribed spacer (ITS) of two representative colonies was PCR amplified, and the nucleotide sequences were shown to be 99% identical to the 16S-23S ITS sequence from the genome of Acidovorax avenae subsp. avenae strain ATCC 19860 (GenBank: CP002521.1). One of these A. avenae subsp. avenae isolates from Gabon was inoculated into greenhouse grown plants of sugarcane cultivar R570. Plants were inoculated by injection into the sheath of spindle leaves above the meristem with the bacterial strain (12 plants) or with a water control (six plants). In this method, the bacteria (108 CFU/ml) were injected using a syringe through the leaf sheath until filling the leaf whorl. Three weeks post-inoculation, one to several cm long red-brown stripes were observed on leaves of 11 of 12 inoculated plants. Seven weeks post-inoculation, all plants exhibited symptoms, from red, brown, or black stripes to leaf necrosis, rotting, and death of the spindle leaves (six plants). All six control plants were symptomless. In a second experiment, 6 of 12 plants showed symptoms 3 weeks post inoculation, and the pathogen was successfully re-isolated from all six symptomatic plants with YPGA medium. The 16S-23S ITS of three single colonies obtained each from different symptomatic plants were PCR amplified and the nucleotide sequences were again found 99% identical to the 16S-23S ITS sequence from the genome of A. avenae subsp. avenae ATCC 19860. To our knowledge, this is the first report of A. avenae subsp. avenae, the causal agent of sugarcane red stripe (also reported as top rot), in Gabon. It is also the first description of the occurrence of the top rot form of the disease in R570, a cultivar that is grown in several locations of Africa, the Mascarene Islands, and the French West Indies. A large-scale survey needs to be undertaken to determine the distribution of red stripe in Gabon, a disease for which several outbreaks have been reported recently worldwide (1,2). References: (1) M. P. Grisham and R. M. Johnson. Phytopathology 101:564, 2011. (2) S. Zia-ul-Hussnain et al. Afr. J. Biotechnol. 10:7191, 2011.
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Affiliation(s)
- J-C Girard
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - J Noëll
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - F Larbre
- SUCAF GABON, BP610, Franceville, Gabon
| | - P Roumagnac
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - P Rott
- CIRAD, UMR BGPI, F-34398 Montpellier, France
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Mensi I, Girard JC, Pieretti I, Larbre F, Roumagnac P, Royer M, Rott P. First Report of Sugarcane Leaf Scald in Gabon Caused by a Highly Virulent and Aggressive Strain of Xanthomonas albilineans. Plant Dis 2013; 97:988. [PMID: 30722583 DOI: 10.1094/pdis-01-13-0044-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
During a disease inspection at the sugarcane estate SUCAF near Franceville, Gabon, in March 2011, 0.5 to 1 cm wide chlorotic stripes covered with many small red streaks were observed on sugarcane (Saccharum spp.) leaves of a single plant of cultivar R581. After removal of the leaves covering the base of the stalks, abnormal development of basal side shoots was also observed. Transversal sections of a diseased stalk showed reddening of the vessels near the nodes. Circular, convex, smooth, shiny, translucent, non-mucoid, honey-yellow pigmented bacterial colonies were isolated from stalk pieces and side shoots on XAS selective agar medium (1). The nucleotide sequence of the 16S-23S internal transcribed spacer (ITS) of a representative colony was shown to be 100% identical to the 16S-23S ITS sequence from the genome of Xanthomonas albilineans strain GPE PC73 (GenBank: FP565176.1). This strain from Gabon was named GAB266. Sugarcane stalks of greenhouse grown cultivar CP68-1026 were inoculated with X. albilineans strains XaFL07-1 from Florida, GPE PC73 from Guadeloupe, and GAB266. Five stalks were inoculated by the modified decapitation method (3) with each strain or with a water control. One month post-inoculation (MPI), white pencil lines and severe necrosis were observed on leaves inoculated with strains XaFL07-1 and GPE PC73, and no disease symptoms appeared on non-inoculated leaves that developed 2 to 3 MPI. These results are in agreement with those generally obtained after inoculation of susceptible sugarcane cultivars with X. albilineans strains from various geographical locations under greenhouse conditions (Rott, unpublished results). In contrast, 1 MPI, only discrete white to red pencil lines were observed along with necrosis on leaves inoculated with strain GAB266, and by 2 to 3 MPI, all five inoculated plants were wilted. The pathogen was successfully reisolated by the stalk blot inoculation technique (3) with XAS medium, from all five inoculated stalks and from 98 of 114 internodes. In a second greenhouse experiment, the same three strains of X. albilineans were inoculated as described above into five sugarcane cultivars differing in resistance to leaf scald in Guadeloupe (2) (CP68-1026, highly susceptible; B69566, susceptible; R570, tolerant; B8008, resistant; Co6415, highly resistant). The same symptoms as those described above were again observed on inoculated leaves of the five sugarcane cultivars 1 MPI. Strains XaFL07-1 and GPE PC73 produced occasionally a single pencil line on non-inoculated leaves 2 to 3 MPI, but only strain GAB266 caused leaf scalding and/or plant death 2 to 3 MPI: cultivar CP68-1026 (5 of 5 plants), B69566 (5 of 5 plants), R570 (4 of 5 plants), B8008 (5 of 5 plants), and only non-inoculated leaves of cultivar Co6415 remained symptomless (5 plants). Strain GAB266 from Gabon appeared, therefore, more virulent and aggressive than the two strains of X. albilineans from Florida and Guadeloupe. To our knowledge, this is the first report of leaf scald of sugarcane in Gabon and the first description of an unusual highly virulent and aggressive strain of X. albilineans. A large-scale survey needs to be undertaken to determine the distribution of leaf scald disease and this new pathotype/race of X. albilineans in Gabon and other geographical locations. References: (1) M. J. Davis et al. Plant Dis. 78:78, 1994. (2) P. Rott et al. Phytopathology 87:1202, 1997 (3) P. Rott et al. Mol. Plant-Microbe Interact. 24:594, 2011.
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Affiliation(s)
- I Mensi
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - J-C Girard
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - I Pieretti
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - F Larbre
- SUCAF GABON, BP610, Franceville, Gabon
| | - P Roumagnac
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - M Royer
- CIRAD, UMR BGPI, F-34398 Montpellier, France
| | - P Rott
- CIRAD, UMR BGPI, F-34398 Montpellier, France
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Fain B, Robert-Philip I, Beveratos A, David C, Wang ZZ, Sagnes I, Girard JC. Discretization of electronic states in large InAsP/InP multilevel quantum dots probed by scanning tunneling spectroscopy. Phys Rev Lett 2012; 108:126808. [PMID: 22540615 DOI: 10.1103/physrevlett.108.126808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Indexed: 05/31/2023]
Abstract
The topography and the electronic structure of InAsP/InP quantum dots are probed by cross-sectional scanning tunneling microscopy and spectroscopy. The study of the local density of states in such large quantum dots confirms the discrete nature of the electronic levels whose wave functions are measured by differential conductivity mapping. Because of their large dimensions, the energy separation between the discrete electronic levels is low, allowing for quantization in both the lateral and growth directions as well as the observation of the harmonicity of the dot lateral potential.
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Affiliation(s)
- B Fain
- Laboratoire de Photonique et de Nanostructures LPN-CNRS UPR20, Route de Nozay, 91460 Marcoussis, France
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Falloon T, Henry E, Davis MJ, Fernandez E, Girard JC, Rott P, Daugrois JH. First Report of Leifsonia xyli subsp. xyli, Causal Agent of Ratoon Stunting of Sugarcane, in Jamaica. Plant Dis 2006; 90:245. [PMID: 30786422 DOI: 10.1094/pd-90-0245b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
To our knowledge, this is the first report that Leifsonia xyli subsp. xyli, previously named Clavibacter xyli subsp. xyli (2), has been detected and identified in sugarcane in Jamaica. Although ratoon stunting (also known as ratoon stunting disease or RSD) has been reported in Jamaica since 1961, presence of the pathogen had never been confirmed in symptomatic tissues. A major industry-wide survey conducted in 1987 using the fluorescent antibody staining technique failed to detect positives in any of the 61 fields sampled in Jamaica. A new survey was conducted in 2004 on eight estates and the Sugar Industry Research Institute (SIRI) in Jamaica. Six arbitrarily selected stalks were sampled from each of 64 fields representing 25 different sugarcane cultivars. A 1-cm diameter core was extracted from the center of the bottom part of the stalk and used to detect the pathogen by tissue blot immunoassay (TBIA) (3). L. xyli subsp. xyli was detected in 26 of 384 samples (7%). At least one positive sample was found in 10 fields and seven cultivars and in one case (sugarcane cv. D14146 at the St Thomas Sugar Estate), all six stalks sampled in a field were positive. The highest number of infected fields (6 of 10) occurred at Worthy Park where cane yield in 2004 was 86.54 tons per ha compared with an average of 68.04 tons per ha for major estates in Jamaica (1). This latter result would indicate that where good quality agronomic practices are maintained, the effect of ratoon stunting might not be substantial or that sugarcane cultivars grown at this location were resistant to ratoon stunting. Pathogen identification was confirmed using nested polymerase chain reaction (PCR) with three samples from a TBIA-positive field of cv. D14146. Primary primers were RSD 33 (CTGGCACCCTGTGTTGTTTTC) and RSD 297 (TTCGGTTCTCATCTCAGCGTC) and secondary, nested primers were RST60 (TCAACGCAGAGATTGTCCAG) and RST59 (CGTCTTGAAGACACAGCGATGAG). The thermocycler parameters were denaturization at 94°C for 4 min, 31 cycles at 94°C for 30 s, 55°C for 30 s, 65°C for 1 min, and final extension at 65°C for 3 min. The nested-PCR product (approximately 230 bp) of each sample was cloned and sequenced. It showed 99 to 100% identity with the 16S-23S intergenic spacer region of L. xyli subsp. xyli, thus confirming occurrence of ratoon stunting in Jamaica. Since this study, the SIRI has installed a hot-water treatment plant and will heat-treat cuttings before planting the nurseries with new sugarcane clones selected for release to growers. The SIRI will also conduct screening for ratoon stunting resistance to ensure that susceptible clones are not released to the industry. Meanwhile, the SIRI will do a more intense survey so that a more comprehensive picture may be obtained of the presence of ratoon stunting in Jamaica. References: (1) Anonymous. Annual Report of the Sugar Industry Research Institute, Jamaica, 2004. (2) L. I. Evtushenko et al. Int. J. Syst. Evol. Microbiol. 50:371, 2000. (3) N. A. Harrison and M. J. Davis. Phytopathology 78:722, 1988.
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Affiliation(s)
- T Falloon
- Sugar Industry Research Institute (SIRI), Kendal Road, Mandeville, Jamaica
| | - E Henry
- Sugar Industry Research Institute (SIRI), Kendal Road, Mandeville, Jamaica
| | - M J Davis
- Tropical Research and Education Center, University of Florida, IFAS, 18905 S.W. 280 Street, Homestead 33031
| | - E Fernandez
- UMR BGPI Agro.M/CIRAD/INRA, TA 41/K, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France
| | - J-C Girard
- UMR BGPI Agro.M/CIRAD/INRA, TA 41/K, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France
| | - P Rott
- UMR BGPI Agro.M/CIRAD/INRA, TA 41/K, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France
| | - J-H Daugrois
- CIRAD, 97170 Petit Bourg, Guadeloupe (French West Indies)
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Champoiseau P, Daugrois JH, Girard JC, Royer M, Rott PC. Variation in Albicidin Biosynthesis Genes and in Pathogenicity of Xanthomonas albilineans, the Sugarcane Leaf Scald Pathogen. Phytopathology 2006; 96:33-45. [PMID: 18944203 DOI: 10.1094/phyto-96-0033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ABSTRACT Total genomic DNA from 137 strains of Xanthomonas albilineans from worldwide locations was hybridized with two DNA probes that together harbor the entire 49-kb albicidin biosynthesis gene cluster and two additional 3-kb genomic regions required for albicidin production. Fourteen haplotypes and two major genetic groups (albicidin [ALB]-restriction fragment length polymorphism [RFLP] A and ALB-RFLP B) were identified, and strains that were isolated after recent outbreaks of leaf scald disease belonged to group ALB-RFLP B. Albicidin genetic diversity was very similar to the previously described genetic diversity of the pathogen based on the whole genome. No relationship was found between variability of albicidin biosynthesis genes and the amount of albicidin produced in vitro by X. albilineans. Leaf scald-susceptible sugarcane cv. H70-144 was inoculated with 20 strains of the pathogen belonging to different ALB-RFLP haplotypes. Among them, 10 strains from Guadeloupe belonged to the same ALB-RFLP group but differed in the amount of albicidin produced in vitro. Strains were distributed in at least three different pathogenicity groups based on symptom severity and pathogen population density in the stalk. These two pathogenicity factors varied concurrently; however, no relationship between variation in albicidin biosynthesis genes, variation in the amount of albicidin produced in vitro, and variation in pathogenicity of X. albilineans was found. Further investigation is necessary to identify other genes involved in pathogenicity of X. albilineans.
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Asnaghi C, Roques D, Ruffel S, Kaye C, Hoarau JY, Télismart H, Girard JC, Raboin LM, Risterucci AM, Grivet L, D'Hont A. Targeted mapping of a sugarcane rust resistance gene (Bru1) using bulked segregant analysis and AFLP markers. Theor Appl Genet 2004; 108:759-64. [PMID: 14586507 DOI: 10.1007/s00122-003-1487-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2003] [Accepted: 08/28/2003] [Indexed: 05/07/2023]
Abstract
The presence of a major resistance gene (Bru1) for brown rust in the sugarcane cultivar R570 (2n about 115) was confirmed by analyzing segregation of rust resistance in a large population of 658 individuals, derived from selfing of clone R570. A subset of this population was analyzed with AFLP and bulked segregant analysis (BSA) to develop a detailed genetic map around the resistance gene. Four hundred and forty three primer pairs were used resulting in the identification of eight AFLP markers surrounding the resistance gene in an interval of 10 cM, with the closest markers located at 1.9 and 2.2 cM on each side of the gene. Efficiency of the AFLP/BSA applied to the complex polyploid genome of sugarcane is discussed, as well as the potential of the newly identified AFLP markers for developing a map-based cloning approach exploiting, synteny conservation with sorghum.
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Affiliation(s)
- C Asnaghi
- CIRAD, UMR 1096, TA40/03, avenue Agropolis, 34398, Montpellier Cedex 5, France
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Alegria OM, Royer M, Bousalem M, Chatenet M, Peterschmitt M, Girard JC, Rott P. Genetic diversity in the coat protein coding region of eighty-six sugarcane mosaic virus isolates from eight countries, particularly from Cameroon and Congo. Arch Virol 2003; 148:357-72. [PMID: 12556998 DOI: 10.1007/s00705-002-0916-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fifty-eight sugarcane virus isolates were obtained from leaves showing mosaic symptoms, and collected in Cameroon (26 isolates), Congo (20 isolates), Egypt (1 isolate), South Africa (3 isolates) and the U.S.A. (8 isolates). All these isolates belonged to Sugarcane mosaic virus (SCMV) based on the amplification product obtained by RT-PCR with SCMV-specific primers. The amplicons (0.9 kb) from the coat protein (CP) coding region were cloned, sequenced and compared to each other as well as to the sequences (GenBank accessions) of 16 SCMV isolates from sugarcane (Australia, South Africa and U.S.A.) and 12 SCMV isolates from maize (Australia, Germany and China). Maximum likelihood and maximum parsimony analyses robustly supported two major monophyletic groups that were correlated with the host of origin: the SCE or sugarcane group that included all isolates from sugarcane and the MZ or maize group that contained all isolates from maize. The 86 virus isolates were distributed in 13 minor phylogenetic groups, four (I-IV) restricted to maize and nine (V-XIII) to sugarcane. A strong correlation was observed between the sugarcane groups and the geographical origin of the SCMV isolates. Each SCMV type strain from sugarcane (A, B, D, E and SC) was distributed in a different phylogenetic group or subgroup. The 26 isolates from Cameroon constituted a relatively homogeneous group (group V) whereas the 20 isolates from Congo belonged to two other groups (VI and VII). All the isolates from Cameroon and Congo were different from the SCMV type strains and other strains or isolates studied so far. It appears, therefore, that the population of SCMV from sugarcane in Africa contains virus genotypes that have not yet been described.
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Affiliation(s)
- O M Alegria
- UMR 385 ENSAM-INRA-CIRAD Biologie et Génétique des Interactions Plante-Parasite, Montpellier, France
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Abstract
Two sugarcane cultivars, H 50-7209 and H 32-8560, have exhibited unusual, severe leaf yellowing for more than 18 years at Agro Industrial Paramonga S.A. (AIPSA) in Peru. In 1999, these varieties occupied about 4,600 ha (74% of the cultivated area), and almost all fields showed these symptoms. Symptoms first appear on the upper third of the leaf blades, which turns light green to light yellow in young canes up to 6 to 8 months of age. Between 10 and 16 months of age, the symptoms are visible on the spindle and first to third visible dewlap leaves. Tips and margins of older leaves become necrotic, and leaves can turn completely necrotic as the necrosis progresses down the leaves. The abaxial surface of leaf midribs is rarely bright yellow, which differs from the characteristic symptom of yellow leaf syndrome caused by the Sugarcane yellow leaf virus (ScYLV) (1). The most severe symptoms occur when the leaves of stalks that flower turn completely yellow and die. Samples from 98 plants exhibiting different types of yellowing were collected from six commercial fields of cultivars H 50-7209 and H 32-8560 and the germ plasm collection (cultivars PCG 59-1609, Trojan, CP 48-103, CP 72-2086, Q 87, and PR 908) at Paramonga. Tissue blot immunoassay was used to detect ScYLV in the midrib of the top visible dewlap leaf using antiserum provided by B. E. L. Lockhart (University of Minnesota) (2). ScYLV was detected in all 49 commercial field samples and in 35 out of 49 germ plasm samples. All six cultivars of the germ plasm collection were found to be infected, but ScYLV was detected in only a few leaves of Trojan and CP 72-2086. Eighteen cuttings from diseased stalks of cultivars H 50-7209 and H 32-8560 were grown in a greenhouse in Montpellier, France. Yellowing of the underside of the midribs and of the leaf tips appeared after 3 months in cultivar H 50-7209 but only after 9 months in cultivar H 32-8560. At 9 months, the top leaf with a visible dewlap and the four leaves immediately below it of cultivar H 50-7209 exhibited severe yellowing. Reverse transcription polymerase chain reaction with specific ScYLV primers, provided by M. S. Irey (U.S. Sugar Corp., Clewiston, FL) were used to detect ScYLV in the top visible dewlap leaf (1), and ScYLV was found in all nine samples taken from 6-month-old plants of the two cultivars. This is the first report of ScYLV in Peru. References: (1) J. C. Comstock et al. Sugar Cane 4:21, 1998. (2) S. Schenck et al. Sugar Cane 4:5, 1997.
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Affiliation(s)
- O M Alegría
- CIRAD-CA, TA 71/09, Avenue Agropolis, 34398 Montpellier Cedex 5, France
| | - M Chatenet
- CIRAD-CA, TA 71/09, Avenue Agropolis, 34398 Montpellier Cedex 5, France
| | - J C Girard
- CIRAD-CA, TA 71/09, Avenue Agropolis, 34398 Montpellier Cedex 5, France
| | | | - A Nuget
- AIPSA, Carretera Panamericana Paramonga, Peru
| | - P Rott
- CIRAD-CA, TA 71/09, Avenue Agropolis, 34398 Montpellier Cedex 5, France
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Abstract
Atomic force microscopy (AFM) was used to obtain micrographs of dried bacteria in air, and of living ones in their culture medium. Images of dried bacteria were very similar to images obtained elsewhere by the much more complicated cryoetching preparation technique for transmission electron microscopy. Living bacteria were immobilized on a poly-L-lysine film, and directly observed in their culture medium at a resolution unattainable by any other technique applicable to living material. The images were similar to those obtained in scanning electron microscopy where the specimen must be fixed, dried and coated with conductive material, and as a result, no longer viable.
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Affiliation(s)
- D Robichon
- Laboratoire de biologie moléculaire, IBMIG, ESA CNRS 6031, Poitiers, France
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Audouin W, Couture G, Girard JC, Forest JC. [Evaluation of urinary density by AMES reagent strips and comparison to the density determined by refractometry and urinary osmolarity]. Clin Biochem 1985; 18:130-3. [PMID: 4017224 DOI: 10.1016/s0009-9120(85)80095-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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