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1. Site-specific cleavage and joining of single-stranded DNA by VirD2 protein of Agrobacterium tumefaciens Ti plasmids: analogy to bacterial conjugation

Author:
Lanka, E.,   et al.   ; Pansegrau, W.; Schoumacher, F.; Hohn, B.;     Show all 4 Authors
Source:
Proceedings of the National Academy of Sciences of the United States of America 1993 v.90 no.24 pp. 11538-11542
ISSN:
0027-8424
Subject:
proteins; Agrobacterium radiobacter; plasmid vectors; transfer DNA; nucleotide sequences
Abstract:
... As an early stage of plant transformation by Agrobacterium tumefaciens, the Ti plasmid is nicked at the border sequences that delimit the T-DNA. Cleavage results in covalent attachment of VirD2 to the 5' termini of the nicked strand by a process resembling initiation of DNA transfer that occurs in the donor cell during bacterial conjugation. We demonstrate that this cleavage can be reproduced in v ...
DOI:
10.1073/pnas.90.24.11538
PubMed:
8265585
PubMed Central:
PMC48019

2. Antibiosis mechanism of resistance to pod borer, Helicoverpa armigera in wild relatives of chickpea

Author:
S. K. Lanka,   et al.   ; H. C. Sharmad; G. Pampapathy; T. J. Ridsdill-Smith;     Show all 4 Authors
Source:
Euphytica 2005 v.142 no.1-2 pp. 107-117
ISSN:
0014-2336
Subject:
Cicer; wild relatives; antibiosis; pest resistance; Helicoverpa armigera; insect pests; plant genetic resources; plant breeding; vegetative growth; flowering; crop damage
Abstract:
... The pod borer, Helicoverpa armigera, is one of the major constraints to chickpea production worldwide. The levels of resistance to pod borer in the cultivated chickpea germplasm are moderate, and therefore, we studied the reaction of 32 accessions of wild relatives of chickpea for resistance to H. armigera under greenhouse conditions. Accessions ICC 17257, IG 70002, IG 70003, IG 70012, (Cicer biju ...
DOI:
10.1007/s10681-005-1041-5

3. Exploitation of wild Cicer reticulatum germplasm for resistance to Helicoverpa armigera

Author:
Lanka, S.K.,   et al.   ; Sharma, H.C.; Pampapathy, G.; Ridsdill-Smith, T.J.;     Show all 4 Authors
Source:
Journal of economic entomology 2005 v.98 no.6 pp. 2246-2253
ISSN:
0022-0493
Subject:
plant damage; germplasm evaluation; genetic resistance; wild relatives; Helicoverpa armigera; chickpeas; insect development; Cicer arietinum; pest resistance; mortality; India
Abstract:
... In the absence of high levels of resistance to Helicoverpa armigera (Hubner) in the cultivated germplasm of chickpea, we evaluated accessions of Cicer spp. mostly Cicer reticulatum Ladzinsky, for resistance to this important pest. Under multichoice conditions in the field, 10 accessions showed lower leaf damage and lower numbers of eggs, larvae, or both of H. armigera. Of these, IG 69960, IG 72934 ...
DOI:
10.1093/jee/98.6.2246
PubMed:
16539156

4. Crystal structure of KorA bound to operator DNA: insight into repressor cooperation in RP4 gene regulation

Author:
Lanka, Erich,   et al.   ; König, Bettina; Müller, Jürgen J.; Heinemann, Udo;     Show all 4 Authors
Source:
Nucleic acids research 2009 v.37 no.6 pp. 1915-1924
ISSN:
0305-1048
Subject:
crystal structure; dimerization; genes; hydrogen bonding; mutagenesis; nucleosides; plasmids; proteins
Abstract:
... KorA is a global repressor in RP4 which regulates cooperatively the expression of plasmid genes whose products are involved in replication, conjugative transfer and stable inheritance. The structure of KorA bound to an 18-bp DNA duplex that contains the symmetric operator sequence and incorporates 5-bromo-deoxyuridine nucleosides has been determined by multiple-wavelength anomalous diffraction pha ...
DOI:
10.1093/nar/gkp044
PubMed:
19190096
PubMed Central:
PMC2665229

5. Structure and function of primase RepB' encoded by broad-host-range plasmid RSF1010 that replicates exclusively in leading-strand mode

Author:
Lanka, Erich,   et al.   ; Geibel, Sebastian; Banchenko, Sofia; Engel, Michael; Saenger, Wolfram;     Show all 5 Authors
Source:
Proceedings of the National Academy of Sciences of the United States of America 2009 v.106 no.19 pp. 7810-7815
ISSN:
0027-8424
Subject:
DNA primers; DNA replication; active sites; amino acids; crystal structure; models; plasmids; sequence analysis
Abstract:
... For the initiation of DNA replication, dsDNA is unwound by helicases. Primases then recognize specific sequences on the template DNA strands and synthesize complementary oligonucleotide primers that are elongated by DNA polymerases in leading- and lagging-strand mode. The bacterial plasmid RSF1010 provides a model for the initiation of DNA replication, because it encodes the smallest known primase ...
DOI:
10.1073/pnas.0902910106
PubMed:
19416864
PubMed Central:
PMC2683140

6. A Multiphasic Typing Approach to Subtype Streptococcus Equi Subspecies Equi

Author:
Saraswathi Lanka,   et al.   ; Luke B. Borst; Sheila K. Patterson; Carol W. Maddox;     Show all 4 Authors
Source:
Journal of veterinary diagnostic investigation v.22 no.6 pp. 928-936
ISSN:
1040-6387
Subject:
Streptococcus equi; abscess; genes; genotyping; guanine; horses; polymerase chain reaction; pulsed-field gel electrophoresis; quarantine; single nucleotide polymorphism; strangles; Illinois
Abstract:
... The objective of the present investigation was to differentiate between strains of Streptococcus equi subspecies equi implicated in abscess formation in vaccinated horses. Streptococcus equi isolates recovered from clinical specimens associated with equine strangles cases submitted to the University of Illinois Veterinary Diagnostic Laboratory were compared with S. equi isolates representing at le ...
DOI:
10.1177/104063871002200612
PubMed:
21088177

7. Acute toxicity of chlorantraniliprole to non-target crayfish (Procambarus clarkii) associated with rice-crayfish cropping systems

Author:
Lanka, Srinivas K.,   et al.   ; Barbee, Gary C.; McClain, W. Ray; Stout, Michael J.;     Show all 4 Authors
Source:
Pest management science 2010 v.66 no.9 pp. 996-1001
ISSN:
1526-498X
Subject:
rice; nontarget organisms; insect pests; insecticides; acute toxicity; seeds; animal behavior; Oryza sativa; Lissorhoptrus oryzophilus; plant pests; no observed adverse effect level; Procambarus clarkii; mortality; crayfish culture; crayfish; lethal concentration 50; oral administration; adverse effects; chronic exposure
Abstract:
... BACKGROUND: Chlorantraniliprole, a novel anthranilic diamide insecticide, was recently introduced into the United States where rice-crayfish crop rotations are practiced to control rice water weevil (Lissorhoptrus oryzophilus Kuschel) infestations. Chlorantraniliprole has high margins of mammalian safety and excellent insecticidal efficacy, but its toxicity to non-target crayfish is uncertain. In ...
DOI:
10.1002/ps.1972
PubMed:
20730992

8. Bioethanol fermentation of concentrated rice straw hydrolysate using co-culture of Saccharomyces cerevisiae and Pichia stipitis

Author:
Lanka Sateesh,   et al.   ; K. Srilekha Yadav; Shaik Naseeruddin; G. Sai Prashanthi; L. Venkateswar Rao;     Show all 5 Authors
Source:
Bioresource technology 2011 v.102 no.11 pp. 6473-6478
ISSN:
0960-8524
Subject:
Saccharomyces cerevisiae; Scheffersomyces stipitis; acid hydrolysis; bioethanol; coculture; distillation; ethanol; feedstocks; fermentation; furans; hexoses; hydrolysates; pentoses; phenols; rice straw; sulfuric acid
Abstract:
... Rice straw is one of the abundant lignocellulosic feed stocks in the world and has been selected for producing ethanol at an economically feasible manner. It contains a mixture of sugars (hexoses and pentoses). Biphasic acid hydrolysis was carried out with sulphuric acid using rice straw. After acid hydrolysis, the sugars, furans and phenolics were estimated. The initial concentration of sugar was ...
DOI:
10.1016/j.biortech.2011.03.019
PubMed:
21470850

9. Evaluation of a commercially available modified-live Streptococcus equi subsp equi vaccine in ponies

Author:
Lanka, Saraswathi,   et al.   ; Borst, Luke B.; Patterson, Sheila K.; Barger, Anne M.; Fredrickson, Richard L.; Maddox, Carol W.;     Show all 6 Authors
Source:
American journal of veterinary research 2011 v.72 no.8 pp. 1130-1138
ISSN:
0002-9645
Subject:
Streptococcus equi subsp. equi; abscess; antibodies; antigens; horses; immunoglobulin G; lymph nodes; morbidity; polymerase chain reaction; secondary immunization; tissues; vaccination; vaccines
Abstract:
... Objective—To evaluate a commercially available modified-live Streptococcus equi subsp equi vaccine for safety and persistence in vaccinated ponies and to detect recombination or reversion events in the vaccine strain. Animals—5 ponies that were 1.5 to 8 years old (group 1) and 4 ponies that were 6 months old (group 2). Procedures—Ponies were vaccinated, with a subsequent booster vaccination 2 to 3 ...
DOI:
10.2460/ajvr.72.8.1130

10. The influence of carbon nanotube (CNT) morphology and diameter on the processing and properties of CNT-reinforced aluminium composites

Author:
S. Lanka,   et al.   ; A.M.K. Esawi; K. Morsi; A. Sayed; M. Taher;     Show all 5 Authors
Source:
Composites 2011 v.42 no.3 pp. 234-243
ISSN:
1359-835X
Subject:
aluminum; aluminum oxide; carbon nanotubes; cold; extrusion; hardness; milling; nanoparticles; powders; transmission electron microscopy
Abstract:
... Ball milling was used to disperse MWCNTs of two different morphologies (stiff and straight vs. bent and entangled) and diameters (very large diameter and 3.5 times smaller diameter) in aluminium powders, which were subsequently hot consolidated by hot extrusion. Characterization of the produced composites revealed that the CNT morphology plays an important role in affecting dispersion. It was foun ...
DOI:
10.1016/j.compositesa.2010.11.008

11. Facile synthesis of novel dispiroheterocylic derivatives through cycloaddition of azomethine ylides with acenaphthenone-2-ylidine ketones

Author:
Srinu Lanka,   et al.   ; Sathiah Thennarasu; Paramasivan T. Perumal;     Show all 3 Authors
Source:
Tetrahedron letters 2012 v.53 no.52 pp. 7052-7055
ISSN:
0040-4039
Subject:
chemical reactions; chemical structure; ketones; methanol
Abstract:
... The regioselective synthesis of a series of novel dispiropyrrolidines and dispiropyrrolizidines has been accomplished through intermolecular 1,3-dipolar cycloaddition of azomethine ylides obtained from 1,2-diones like isatin and acenaphthenequinone with acenaphthenone-2-ylidine ketone dipolarophiles in methanol under reflux conditions. ...
DOI:
10.1016/j.tetlet.2012.10.061

12. Simultaneous Cellulase Production, Saccharification and Detoxification Using Dilute Acid Hydrolysate of S. spontaneum with Trichoderma reesei NCIM 992 and Aspergillus niger

Author:
Lanka Sateesh,   et al.   ; Adivikatla Vimala Rodhe; Shaik Naseeruddin; Kothagauni Srilekha Yadav; Yenumulagerard Prasad; Linga Venkateswar Rao;     Show all 6 Authors
Source:
Indian journal of microbiology 2012 v.52 no.2 pp. 258-262
ISSN:
0046-8991
Subject:
Aspergillus niger; Saccharum spontaneum; Trichoderma reesei; acid hydrolysis; biomass; endo-1,4-beta-glucanase; ethanol production; hydrolysates; lignocellulose; nutrients; phenolic compounds; production costs; saccharification; sugars; yeasts
Abstract:
... Bioethanol production from lignocellulosic materials has several limitations. One aspect is the high production cost of cellulases used for saccharification of substrate and inhibition of fermenting yeast due to inhibitors released in acid hydrolysis. In the present work we have made an attempt to achieve simultaneous cellulases production, saccharification and detoxification using dilute acid hyd ...
DOI:
10.1007/s12088-011-0184-4
PubMed:
23729891
PubMed Central:
PMC3386449

13. A T cell epitope-based vaccine protects against chlamydial infection in HLA-DR4 transgenic mice

Author:
Gopala Krishna Lanka,   et al.   ; Weidang Li; Ashlesh K. Murthy; Senthilnath L. Chetty; Jieh-Juen Yu; James P. Chambers; Guangming Zhong; Thomas G. Forsthuber; M. Neal Guentzel; Bernard P. Arulanandam;     Show all 10 Authors
Source:
Vaccine 2013 v.31 no.48 pp. 5722-5728
ISSN:
0264-410X
Subject:
CD4-positive T-lymphocytes; Chlamydia muridarum; Chlamydia trachomatis; animal models; cell-mediated immunity; clones; epitopes; humans; interferon-gamma; mice; monitoring; peptides; screening; spleen; splenocytes; transgenic animals; vaccination; vaccines
Abstract:
... Vaccination with recombinant chlamydial protease-like activity factor (rCPAF) has been shown to provide robust protection against genital Chlamydia infection. Adoptive transfer of IFN-γ competent CPAF-specific CD4+ T cells was sufficient to induce early resolution of chlamydial infection and reduction of subsequent pathology in recipient IFN-γ-deficient mice indicating the importance of IFN-γ secr ...
DOI:
10.1016/j.vaccine.2013.09.036
PubMed:
24096029
PubMed Central:
PMC3843363

14. Canine ocular onchocercosis in the United States is associated with Onchocerca lupi

Author:
Saraswathi Lanka,   et al.   ; Amber L. Labelle; Carol W. Maddox; Joshua B. Daniels; Therese E. Eggett; Richard R. Dubielzig; Philippe Labelle;     Show all 7 Authors
Source:
Veterinary parasitology 2013 v.193 no.1-3 pp. 297-301
ISSN:
0304-4017
Subject:
NAD (coenzyme); Onchocerca lienalis; cytochrome-c oxidase; dogs; genes; nucleotide sequences; onchocerciasis; polymerase chain reaction; United States
Abstract:
... Canine ocular onchocerciasis has a worldwide distribution and has been associated in Europe with Onchocerca lupi based on morphologic and molecular analysis. In the United States, canine ocular onchocerciasis is reportedly associated with Onchocerca lienalis. This association is based solely on histopathologic examination of ocular tissues. The purpose of this study was to use molecular analysis o ...
DOI:
10.1016/j.vetpar.2012.12.002
PubMed:
23276598

15. N-Alkylation of amines with alcohols over nanosized zeolite beta

Author:
Lanka Satyanarayana,   et al.   ; Marri Mahender Reddy; Macharla Arun Kumar; Peraka Swamy; Mameda Naresh; Kodumuri Srujana; Akula Venugopal; Nama Narender;     Show all 8 Authors
Source:
Green chemistry 2013 v.15 no.12 pp. 3474-3483
ISSN:
1463-9270
Subject:
alcohols; alkylation; amines; catalysts; catalytic activity; coproducts; green chemistry; imines; nanomaterials; zeolites
Abstract:
... Direct N-alkylation of amines with alcohols was successfully performed by using nanosized zeolite beta, which showed the highest catalytic activity among other conventional zeolites. This method has several advantages, such as eco-friendliness, moderate to high yields, and simple work-up procedure. The catalyst was successfully recovered and reused without significant loss of activity and only wat ...
DOI:
10.1039/c3gc41345d

16. Systemic effects of thiamethoxam and chlorantraniliprole seed treatments on adult Lissorhoptrus oryzophilus (Coleoptera: Curculionidae) in rice

Author:
Srinivas K Lanka,   et al.   ; James A Ottea; Jeffrey A Davis; Amy B Hernandez; Michael J Stout;     Show all 5 Authors
Source:
Pest management science 2013 v.69 no.2 pp. 250-256
ISSN:
1526-498X
Subject:
Lissorhoptrus oryzophilus; adults; enzyme-linked immunosorbent assay; insecticide residues; larvae; leaf area; leaves; lethal dose 50; mortality; rice; seed treatment; seeds; thiamethoxam
Abstract:
... BACKGROUND: Feeding assays using adult rice water weevils and foliage of plants treated as seeds with chlorantraniliprole and thiamethoxam at different rates were conducted to evaluate the systemic adulticidal and feeding effects. Dose–mortality relationships were determined for thiamethoxam seed treatments by combining leaf area lost due to feeding and insecticide residues analyzed by LC/MS/MS. C ...
DOI:
10.1002/ps.3382
PubMed:
22927256

17. Zebrafish (Danio rerio) as a Screen for Attenuation of Lancefield Group C Streptococci and a Model for Streptococcal Pathogenesis

Author:
S. Lanka,   et al.   ; L. B. Borst; S. K. Patterson; M. M. Suyemoto; C. W. Maddox;     Show all 5 Authors
Source:
Veterinary pathology v.50 no.3 pp. 457-467
ISSN:
1544-2217
Subject:
Danio rerio; Streptococcus; acute phase proteins; alpha chemokines; animal pathology; antimicrobial peptides; bacteria; cell-mediated immunity; coagulation; comparative genomic hybridization; edema; fish; gene expression; gene expression regulation; histology; inflammation; live vaccines; lymph nodes; macrophages; models; necrosis; pathogenesis; respiratory system; sequence deletion; spleen; transcription (genetics); virulence
Abstract:
... Group C streptococci are highly contagious pyogenic bacteria responsible for respiratory tract, lymph node, urogenital tract, and wound infections. Wild-type strains of Streptococcus equi ssp equi (S. equi) and Streptococcus equi ssp zooepidemicus (S. zoo) as well as a commercially available modified live vaccine strain of S. equi were evaluated for virulence in zebrafish. Survival times, histolog ...
DOI:
10.1177/0300985811424731

18. Evaluation of neonicotinoids as pyrethroid alternatives for rice water weevil management in water-seeded rice

Author:
Srinivas K. Lanka,   et al.   ; Michael J. Stout; James A. Ottea;     Show all 3 Authors
Source:
Crop protection 2014 v.56 pp. 37-43
ISSN:
0261-2194
Subject:
Lissorhoptrus oryzophilus; adults; aquatic organisms; bioassays; clothianidin; dinotefuran; foliar application; greenhouse experimentation; insect pests; lambda-cyhalothrin; larvae; larvicides; leaves; pyrethrins; rice; risk; toxicity; United States
Abstract:
... The rice water weevil (RWW), Lissorhoptrus oryzophilus (Kuschel) (Coleoptera: Curculionidae), is the most destructive insect pest of rice in the United States. Water-seeded rice, which is flooded at an earlier stage of crop development than drill-seeded rice, is at heightened risk of loss from root-feeding RWW larvae. Pyrethroids, the most widely used group of foliar insecticides for RWW control, ...
DOI:
10.1016/j.cropro.2013.09.007

19. Influence of Rice Seeding Rate on Efficacies of Neonicotinoid and Anthranilic Diamide Seed Treatments against Rice Water Weevil

Author:
Srinivas Lanka,   et al.   ; Jason Hamm; Michael Stout;     Show all 3 Authors
Source:
Insects 2014 v.5 no.4 pp. 961-973
ISSN:
2075-4450
Subject:
Lissorhoptrus oryzophilus; Oryza sativa; clothianidin; grain yield; larvae; rice; seed treatment; sowing; thiamethoxam; United States
Abstract:
... Rice in the U.S. is frequently seeded at low rates and treated before sowing with neonicotinoid or anthranilic diamide insecticides to target the rice water weevil. A previous study of the influence of seeding rate on rice water weevil densities showed an inverse relationship between seeding rates and immature weevil densities. This study investigated interactive effects of seeding rate and seed t ...
DOI:
10.3390/insects5040961
PubMed:
26462952
PubMed Central:
PMC4592619

20. Lewis Acid Catalyzed Unprecedented [3 + 2] Cycloaddition Yields 3,3′-Pyrrolidinyldispirooxindoles Containing Four Contiguous Chiral Stereocenters with Two Contiguous Quaternary Spirostereocenters

Author:
Srinu Lanka,   et al.   ; Suman Koorathota; Thennarasu Sathiah;     Show all 3 Authors
Source:
Organic letters 2014 v.16 no.14 pp. 3732-3735
ISSN:
1523-7052
Subject:
Lewis acids; catalytic activity; chemical structure; cycloaddition reactions; ethyleneimine
Abstract:
... A Lewis acid catalyzed domino reaction cascades through azide–alkene cycloaddition, rearrangement, aziridine ring opening, and azomethine cycloaddition with a parent dipolarophile, resulting in 3,3′-pyrrolidinyldispirooxindoles containing four contiguous chiral stereocenters with two contiguous quaternary spirostereocenters. ...
DOI:
10.1021/ol501547p