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Items: 49

1.

Weakening of salmonella with selected microbial metabolites of berry-derived phenolic compounds and organic acids.

Alakomi HL, Puupponen-Pimiä R, Aura AM, Helander IM, Nohynek L, Oksman-Caldentey KM, Saarela M.

J Agric Food Chem. 2007 May 16;55(10):3905-12. Epub 2007 Apr 17.

PMID:
17439151
2.

Weakening effect of cell permeabilizers on gram-negative bacteria causing biodeterioration.

Alakomi HL, Paananen A, Suihko ML, Helander IM, Saarela M.

Appl Environ Microbiol. 2006 Jul;72(7):4695-703.

3.

Berry phenolics: antimicrobial properties and mechanisms of action against severe human pathogens.

Nohynek LJ, Alakomi HL, Kähkönen MP, Heinonen M, Helander IM, Oksman-Caldentey KM, Puupponen-Pimiä RH.

Nutr Cancer. 2006;54(1):18-32.

PMID:
16800770
4.

Porphyromonas somerae sp. nov., a pathogen isolated from humans and distinct from porphyromonas levii.

Summanen PH, Durmaz B, Väisänen ML, Liu C, Molitoris D, Eerola E, Helander IM, Finegold SM.

J Clin Microbiol. 2005 Sep;43(9):4455-9.

5.

Lipopolysaccharides of anaerobic beer spoilage bacteria of the genus Pectinatus--lipopolysaccharides of a Gram-positive genus.

Helander IM, Haikara A, Sadovskaya I, Vinogradov E, Salkinoja-Salonen MS.

FEMS Microbiol Rev. 2004 Nov;28(5):543-52. Review.

6.

The structure of the carbohydrate backbone of the lipopolysaccharide of Pectinatus frisingensis strain VTT E-79104.

Vinogradov E, Li J, Sadovskaya I, Jabbouri S, Helander IM.

Carbohydr Res. 2004 Jun 22;339(9):1637-42.

PMID:
15183738
7.

Lack of O-antigen is essential for plasminogen activation by Yersinia pestis and Salmonella enterica.

Kukkonen M, Suomalainen M, Kyllönen P, Lähteenmäki K, Lång H, Virkola R, Helander IM, Holst O, Korhonen TK.

Mol Microbiol. 2004 Jan;51(1):215-25.

8.
9.

Structure of the exceptionally large nonrepetitive carbohydrate backbone of the lipopolysaccharide of Pectinatus frisingensis strain VTT E-82164.

Vinogradov E, Petersen BO, Sadovskaya I, Jabbouri S, Duus JØ, Helander IM.

Eur J Biochem. 2003 Jul;270(14):3036-46.

10.

Chitosan disrupts the barrier properties of the outer membrane of gram-negative bacteria.

Helander IM, Nurmiaho-Lassila EL, Ahvenainen R, Rhoades J, Roller S.

Int J Food Microbiol. 2001 Dec 30;71(2-3):235-44.

PMID:
11789941
11.

Microbiological methods for testing disinfectant efficiency on Pseudomonas biofilm.

Wirtanen G, Salo S, Helander IM, Mattila-Sandholm T.

Colloids Surf B Biointerfaces. 2001 Jan 15;20(1):37-50.

PMID:
11084307
12.

Permeability barrier of the gram-negative bacterial outer membrane with special reference to nisin.

Helander IM, Mattila-Sandholm T.

Int J Food Microbiol. 2000 Sep 25;60(2-3):153-61.

PMID:
11016605
13.

Lactic acid permeabilizes gram-negative bacteria by disrupting the outer membrane.

Alakomi HL, Skyttä E, Saarela M, Mattila-Sandholm T, Latva-Kala K, Helander IM.

Appl Environ Microbiol. 2000 May;66(5):2001-5.

14.

Fluorometric assessment of gram-negative bacterial permeabilization.

Helander IM, Mattila-Sandholm T.

J Appl Microbiol. 2000 Feb;88(2):213-9.

15.
16.

Polyethyleneimine is an effective permeabilizer of gram-negative bacteria.

Helander IM, Alakomi HL, Latva-Kala K, Koski P.

Microbiology. 1997 Oct;143 ( Pt 10):3193-9.

PMID:
9353921
17.

Phosphate groups in lipopolysaccharides of Salmonella typhimurium rfaP mutants.

Helander IM, Kilpeläinen I, Vaara M.

FEBS Lett. 1997 Jun 16;409(3):457-60.

18.

The lipid A biosynthesis deficiency of the Escherichia coli antibiotic-supersensitive mutant LH530 is suppressed by a novel locus, ORF195.

Hirvas L, Nurminen M, Helander IM, Vuorio R, Vaara M.

Microbiology. 1997 Jan;143 ( Pt 1):73-81.

PMID:
9025280
19.

Biological characterization of Campylobacter fetus lipopolysaccharides.

Moran AP, O'Malley DT, Vuopio-Varkila J, Varkila K, Pyhälä L, Saxén H, Helander IM.

FEMS Immunol Med Microbiol. 1996 Aug;15(1):43-50.

PMID:
8871115
20.
21.

Characterization of lipopolysaccharides of polymyxin-resistant and polymyxin-sensitive Klebsiella pneumoniae O3.

Helander IM, Kato Y, Kilpeläinen I, Kostiainen R, Lindner B, Nummila K, Sugiyama T, Yokochi T.

Eur J Biochem. 1996 Apr 1;237(1):272-8.

22.

Structures of the O-specific polysaccharide chains of Pectinatus cerevisiiphilus and Pectinatus frisingensis lipopolysaccharides.

Senchenkova SN, Shashkov AS, Moran AP, Helander IM, Knirel YA.

Eur J Biochem. 1995 Sep 1;232(2):552-7.

23.
24.

Increased substitution of phosphate groups in lipopolysaccharides and lipid A of polymyxin-resistant mutants of Salmonella typhimurium and Escherichia coli.

Helander IM, Nummila K, Kilpeläinen I, Vaara M.

Prog Clin Biol Res. 1995;392:15-23. No abstract available.

PMID:
8524920
25.

Biochemical characterization of Campylobacter fetus lipopolysaccharides.

Moran AP, O'Malley DT, Kosunen TU, Helander IM.

Infect Immun. 1994 Sep;62(9):3922-9.

26.

Chemical structure of the lipid A component of lipopolysaccharides of the genus Pectinatus.

Helander IM, Kilpeläinen I, Vaara M, Moran AP, Lindner B, Seydel U.

Eur J Biochem. 1994 Aug 15;224(1):63-70.

29.

Outer Membrane Proteins and Lipopolysaccharides in Pathovars of Xanthomonas campestris.

Ojanen T, Helander IM, Haahtela K, Korhonen TK, Laakso T.

Appl Environ Microbiol. 1993 Dec;59(12):4143-51.

30.

Biological activities of lipoteichoic acid and peptidoglycan-teichoic acid of Bacillus subtilis 168 (Marburg).

Himanen JP, Pyhälä L, Olander RM, Merimskaya O, Kuzina T, Lysyuk O, Pronin A, Sanin A, Helander IM, Sarvas M.

J Gen Microbiol. 1993 Nov;139(11):2659-65.

PMID:
8277249
32.

Defective biosynthesis of the lipid A component of temperature-sensitive firA (omsA) mutant of Escherichia coli.

Helander IM, Lindner B, Seydel U, Vaara M.

Eur J Biochem. 1993 Mar 1;212(2):363-9.

33.

Conformation of Escherichia coli outer membrane protein OmpA produced in Bacillus subtilis: influence of lipopolysaccharide.

Puohiniemi R, Muotiala A, Helander IM, Sarvas M.

FEMS Microbiol Lett. 1993 Jan 1;106(1):105-10.

PMID:
8440462
34.
35.
36.

Separation and characterization of two chemically distinct lipopolysaccharides in two Pectinatus species.

Helander IM, Hurme R, Haikara A, Moran AP.

J Bacteriol. 1992 May;174(10):3348-54.

37.

Low biological activity of Helicobacter pylori lipopolysaccharide.

Muotiala A, Helander IM, Pyhälä L, Kosunen TU, Moran AP.

Infect Immun. 1992 Apr;60(4):1714-6.

38.

Preferential synthesis of heptaacyl lipopolysaccharide by the ssc permeability mutant of Salmonella typhimurium.

Helander IM, Hirvas L, Tuominen J, Vaara M.

Eur J Biochem. 1992 Mar 15;204(3):1101-6.

39.

Compositional analysis of Helicobacter pylori rough-form lipopolysaccharides.

Moran AP, Helander IM, Kosunen TU.

J Bacteriol. 1992 Feb;174(4):1370-7.

41.
42.

rfaP mutants of Salmonella typhimurium.

Helander IM, Vaara M, Sukupolvi S, Rhen M, Saarela S, Zähringer U, Mäkelä PH.

Eur J Biochem. 1989 Nov 20;185(3):541-6.

43.

Pulmonary function and symptoms after inhalation of endotoxin.

Rylander R, Bake B, Fischer JJ, Helander IM.

Am Rev Respir Dis. 1989 Oct;140(4):981-6.

PMID:
2508526
44.
45.

Chemical structure of the lipopolysaccharide of Haemophilus influenzae strain I-69 Rd-/b+. Description of a novel deep-rough chemotype.

Helander IM, Lindner B, Brade H, Altmann K, Lindberg AA, Rietschel ET, Zähringer U.

Eur J Biochem. 1988 Nov 15;177(3):483-92.

46.

Analysis of polyamines as their dabsyl derivatives by reversed-phase high-performance liquid chromatography.

Koski P, Helander IM, Sarvas M, Vaara M.

Anal Biochem. 1987 Jul;164(1):261-6.

PMID:
3118735
47.
49.

New Salmonella typhimurium mutants with altered outer membrane permeability.

Sukupolvi S, Vaara M, Helander IM, Viljanen P, Mäkelä PH.

J Bacteriol. 1984 Aug;159(2):704-12.

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