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Elena Rusu

Latest posts by Elena Rusu (see all)

  • ANALIZE PRIVIND ACTIVITATEA ANTIMICROBIANA A UNOR TULPINI DE BACTERII LACTICE - 11/11/2015
  • REGLAREA DIMORFISMULUI PRIN MOLECULE QUORUM SENSING LA SPECIA CANDIDA ALBICANS - 26/08/2015
  • ROLUL HIPOXIEI IN DEZVOLTAREA DE ANOMALII ALE APARATULUI DENTO-MAXILAR - 13/08/2015

Articole semnate de acelasi autor in Revista Romana de Boli Infectioase:

ANALIZE PRIVIND ACTIVITATEA ANTIMICROBIANA A UNOR TULPINI DE BACTERII LACTICE

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVIII, No. 2-3, 2015
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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National Awards “Science and Research”

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ANALIZE PRIVIND ACTIVITATEA ANTIMICROBIANA A UNOR TULPINI DE BACTERII LACTICE

Ionela Sarbu, Tatiana Vassu, Ileana Stoica, Carmen Chifiriuc, Marcela Bucur, Elena Rusu, Robertina Ionescu and Diana Pelinescu

REZUMAT

Obiectiv. Scopul principal al acestui studiu a constat în selecţia unui grup de bacterii lactice cu activitate antimicrobiană ridicată, identificarea compuşilor cu acţiune antimicrobiană şi caracterizarea acestora.

Material şi metode. S-a determinat activitatea antimicrobiană a 153 de tulpini de bacterii lactice prin metoda difuzimetrică faţă de 6 tulpini microbiene patogene izolate de la pacienţi cu infecţii urinare şi vaginale.

Rezultate. În urma obţinerii rezultatelor, s-a constatat că majoritatea tulpinilor de bacterii lactice au prezentat o activitate antimicrobiană ridicată faţă de bacteriile patogene, cât şi faţă de tulpinile de drojdii. Activitatea antimicrobiană a bacteriilor lactice a fost corelată în special cu producerea de acizi organici, iar în cazul a două tulpini aceasta a fost corelată cu biosinteza de bacteriocine. Bacteriocina produsă de tulpina Lactococcus (Lc.) lactis F2a a prezentat un spectru larg de acţiune şi o activitate ridicată (51.200 UA/ml), comparativ cu bacteriocina izolată de la tulpina Lactobacillus (Lb.) paracasei ssp. paracasei JR (400 UA/ml). În ceea ce priveşte stabilitatea bacteriocine produse de tulpina Lc. lactis F2a, aceasta este mai stabilă la pH acid decât la pH bazic, expunerea în timp la o temperatură medie de 600C determină o scădere drastică a activităţii bacteriocinei.

Concluzii. Bacteriile lactice utilizate au prezentat o activitate antimicrobiană ridicată atât faţă de tulpini patogene procariote, cât şi eucariote. Dintre cele două bacteriocine analizate, bacteriocina izolată de la tulpina Lc. lactis F2a a prezentat o activitate ridicată şi un spectru larg de acţiune.

Cuvinte cheie: bacterii lactice, probiotice, bacteriocine

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REGLAREA DIMORFISMULUI PRIN MOLECULE QUORUM SENSING LA SPECIA CANDIDA ALBICANS

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XV, No. 2, Year 2012
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

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REGLAREA DIMORFISMULUI PRIN MOLECULE QUORUM SENSING LA SPECIA CANDIDA ALBICANS

Elena Rusu and Cristina Daniela Cristescu

REZUMAT

Speciile genului Candida sunt fungi dimorfi oportunişti care se găsesc la nivelul mucoaselor gazdei şi cauzează apariţia bolilor superficiale şi sistemice. Candida albicans a fost prima specie de drojdii la care a fost identificat sistemul quorum sensing (QS). Această specie are capacitatea de a-şi modifica morfologia din celule de drojdie în hife, iar acesta este cel mai important factor de virulenţă. C. albicans manifestă câteva fenomene care depind de densitate. Densitatea celulară controlează modificările morfologice între forma celulară de drojdie şi forma filamentoasă. La densităţi celulare crescute celula de Candida este sub formă de drojdie, iar la densităţi celulare scăzute celula de drojdie dezvoltă tub de germinaţie. Acumularea farnesolului blocheză tranziţia de la drojdie la hifă la densităţi celulare crescute, iar adăugarea de farnesol exogen inhibă formarea tubilor germinativi. Această moleculă inhibă formarea tubilor germinativi, dar nu previne elongarea hifelor. O altă moleculă, tirosolul, accelerează procesul de formare a tubilor germinativi. Morfogeneza speciei C. albicans este controlată în funcţie de condiţiile de mediu, pozitiv şi negativ, prin acţiunea tirosolului respectiv a farnesolului. Controlul reciproc al formării tubilor germinativi prin farnesol şi tirosol reflectă o structură complexă a reglării metabolice care stimulează sinteza acestor molecule reglatoare.

Cuvinte cheie: Candida, quorum sensing, farnesol

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ROLUL HIPOXIEI IN DEZVOLTAREA DE ANOMALII ALE APARATULUI DENTO-MAXILAR

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVI, No. 1, Year 2013
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

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ROLUL HIPOXIEI IN DEZVOLTAREA DE ANOMALII ALE APARATULUI DENTO-MAXILAR

Cristina Daniela Cristescu, Vasilica Cristescu, Gheorghe Manole and Elena Rusu

REZUMAT

Sindromul respiraţiei orale, eliminând respiraţia pe nas şi nasofaringe, elimină aproape 60% din rezistenţa la înaintare a fluxului de aer spre alveole, cu consecinţă directă de tulburare a mecanismelor de ventilaţie şi hematoză de la nivel pulmonar şi indirectă prin lipsa stimulilor naturali de creştere la nivelul ansamblului nazal şi al zonelor limitrofe. Factorii responsabili de dezvoltarea anomaliilor sistemului maxilo-facial acţionează asupra dentiţiei, eficienţei contracţiei musculare şi creşterii/dezvoltării armonioase a componentei osoase, în special a maxilarului. Funcţionalitatea normală a structurilor maxilo-faciale este dependentă şi de starea funcţională a aparatului respirator, patologia acestuia determinând modificări ale aparatului maxilo-facial şi reciproc.

 Cuvinte cheie: respiraţie orală, sistem maxilo-facial, hipoxie, fiziopatologie

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MEDICAMENTELE ANTIFUNGICE SI DEZVOLTAREA MECANISMELOR DE REZISTENTA LA UNELE SPECII DE DROJDII

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVI, No. 4, Year 2013
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

The published medical research literature is a global public good. Medical journal editors have a social responsibility to promote global health by publishing, whenever possible, research that furthers health worldwide.

MEDICAMENTELE ANTIFUNGICE SI DEZVOLTAREA MECANISMELOR DE REZISTENTA LA UNELE SPECII DE DROJDII

Elena Rusu, Manole Cojocaru, Minerva Ghinescu and Ane Mary Anghelina

REZUMAT

Candidozele sunt cele mai întâlnite infecţii cauzate de fungi, reprezentând aproximativ jumatate din totalul infecţiilor micotice. Patologia fungică a înregistrat în ultimii ani o frecvenţă foarte crescută. Factorii care contribuie la această oportunitate a infecţiilor sunt: slăbirea sistemului imunitar, greutate scăzută la naştere, creşterea numărului de pacienţi infectaţi cu HIV, chimioterapia pe termen lung, creşterea utilizării dispozitivelor protetice şi a cateterelor vasculare, tratamentele cu corticoizi şi antibiotice cu spectru larg. Al doilea motiv pentru creşterea infecţiilor cauzate de Candida albicans este existenţa multor compuşi cu activitate antifungică. Aceştia se administrează cu precauţie din cauza toxicităţii lor şi a efectelor secundare. Datorită necesităţii de a combate infecţiile cauzate de fungi, studiul substanţelor antifungice este în plină dezvoltare. Cele mai cunoscute şi utilizate substanţe cu activitate antifungică au ca ţintă ergosterolul (principalul sterol al membranelor fungice), biosinteza ergosterolului, biosinteza β-1,3-D-glucanului şi biosinteza ADN.

Cuvinte cheie: Candida, antifungice, rezistenţă

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CLOSTRIDIUM DIFFICILE – ETIOLOGIE SI EPIDEMIOLOGIE

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVII, No. 1, Year 2014
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

The published medical research literature is a global public good. Medical journal editors have a social responsibility to promote global health by publishing, whenever possible, research that furthers health worldwide.

CLOSTRIDIUM DIFFICILE – ETIOLOGIE SI EPIDEMIOLOGIE

Silviu Epuran, Elena Rusu, Adriana Sbarcea and Simona Musat

REZUMAT

Clostridium difficile este un bacil Gram pozitiv mobil, anaerob, prezent în mod obişnuit în flora bacteriană a colonului la mai mult de 50% dintre copii sub un an, procentul reducându-se la aproximativ 3% la adulţi. La om această bacterie produce diareea asociată tratamentului cu antibiotice şi colita pseudomembranoasă care apar la câteva zile de la începerea unui tratament cu antibiotice sau antineoplazice, prin dezechilibrarea florei bacteriene normale şi înmulţirea în lumenul colonului a tulpinei Clostridium difficile rezistente la antibioticul respectiv (ampicilina, amoxicilina, cefalosporinele, clindamicina metronidazolul şi vancomicina). Principalii factori implicaţi în patogenitatea infecţiilor determinate de specia Clostridium difficile sunt: provenienţa din flora naturală a organismului, deficienţe ale mecanismelor de apărare prin anticorpi, sistem complement, leucocite, polimorfonucleare, răspunsul imun mediat celular, sinergismul cu alte microorganisme, precum si elementele care duc la creşterea virulenţei microorganismului (aderenţă, invazie, toxine, enzime şi spori). Pentru evitarea enterocolitelor determinate de specia Clostridium difficile se recomandă limitarea administrării de lungă durată a antibioticelor care determină un dezechilibru al florei normale intestinale, precum şi renunţarea promptă la medicamentul în cauză odată cu apariţia primelor manifestări digestive. Aproximativ un sfert din persoanele care au prezentat infecţii cauzate de specia Clostridium difficile se îmbolnăvesc din nou, fie pentru că infecţia iniţială nu a fost complet vindecată, fie pentru că vin în contact cu o nouă tulpină. Utilizarea probioticelor poate duce la prevenirea infecţiilor recurente cu specia Clostridium difficile.

Cuvinte cheie: Clostridium difficile, floră bacteriană intestinală, antibiotice

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RESISTANCE ON ANTIBIOTIC DRUGS AND INCIDENCE OF SOME BACTERIA SPECIES IN URINARY TRACT INFECTIONS

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Romanian Journal of Infectious Diseases | Vol. XVII, No. 1, Year 2014
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

The published medical research literature is a global public good. Medical journal editors have a social responsibility to promote global health by publishing, whenever possible, research that furthers health worldwide.

RESISTANCE ON ANTIBIOTIC DRUGS AND INCIDENCE OF SOME BACTERIA SPECIES IN URINARY TRACT INFECTIONS

Elena Rusu, Silviu Epuran, Cristina Cristescu and Manole Cojocaru

ABSTRACT

Objectives. The aim of our study was to determine the urinary infection incidence caused by different microbial species and the sensitivity to the different antibiotics classes.

Materials and methods. We observed a lot of 638 patients which were hospitalized in Gerota Hospital from Bucharest during six weeks for different pathologies (gastroenteritis, cardiovascular disease, pneumonitis, and urinary tract infections).

Results. From the total number of patients, 100 were done positive for urinary tract infections. The predominant species was E. coli (65%) followed by Enterococcus species (15%), Proteus species (10%), Enterobacter species (6%), Pseudomonas aeruginosa (3%) and Staphylococcus aureus (1%). The incidence E. coli species was 57% for women and 23% for men. Six strains were susceptibility only to imipenen and resistant to all antibiotics used (four E. coli strains and two Enterobacter strains). Five of these were from men and one from a woman. Incidence of antibiotic drugs resistance was 45% for gentamicin, 43% for cefaclor, 43% for tetracycline, 21.5% for ciprofloxacin, and 26% for amoxicillin and clavulanic acid for E. coli strains.

Conclusion. Most of identified strains belong to Escherichia coli species and have a great resistance to antibiotic drugs.

Keywords: E. coli, antibiotics, resistance

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INFLUENCE OF ASSOCIATING NONSTEROIDAL ANTI-INFLAMMATORY DRUGS WITH ANTIFUNGAL COMPOUNDS ON VIABILITY OF SOME CANDIDA STRAINS

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVII, No. 2, Year 2014
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

The published medical research literature is a global public good. Medical journal editors have a social responsibility to promote global health by publishing, whenever possible, research that furthers health worldwide.

INFLUENCE OF ASSOCIATING NONSTEROIDAL ANTI-INFLAMMATORY DRUGS WITH ANTIFUNGAL COMPOUNDS ON VIABILITY OF SOME CANDIDA STRAINS

Elena Rusu, Ionela Sarbu, Diana Pelinescu, Ioana Nedelcu, Tatiana Vassu, Cristina Cristescu, Simona Musat and Manole Cojocaru

ABSTRACT

Objective. The main goal of our study was to determine the effect that association of nonsteroidal anti-in- flammatory drugs (NSAIDs) with antifungal drugs on viability of Candida (C.) albicans and C. krusei species. Materials and methods. Six yeast strains were isolated from pharyngeal and vaginal secretions (C. albicans and C. krusei). Tests (diffusion and serial microdilutions methods) were carried out in the presence of some NSAIDs by using different concentrations (0.25mg/ml and 1mg/ml). Antifungal drugs were used in lower concentrations than the MIC (1μg/ml). Results. Cell viability of C. krusei strain was of 82% for NSAIDs used and association of these with ketoconazole led to decrease of cell viability of C. krusei strain to 60% as compared to the cells treated with antifungal drugs. In the presence of NSAIDs, cell viability of C. albicans strains, decreased between 6 to 18% for diclofenac and ibuprofen. In the case of simultaneous use of the two classes of drugs, there was observed an increase of antimicrobial activity, especially for diclofenac association, cell viability was reduced up to 60% and respectively 70% as compared to the cells treated only with ketoconazole and fluconazole. Conclusion. We observed a synergistic action of certain NSAIDs with two antifungal drugs used on some Candida species.

Keywords: Candida, Cell viability, NSAID

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EVALUAREA EFECTULUI ANTIMICROBIAN AL UNOR SPECII DE BACTERII LACTICE

SELECT ISSUE

Romanian Journal of Infectious Diseases | Vol. XVIII, No. 1, 2015
ISSN 1454-3389  |  e-ISSN 2069-6051
ISSN-L 1454-3389
DOI: 10.37897/RJID

Indexed

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DOAJ
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HIGHLIGHTS

National Awards “Science and Research”

NEW! RJID has announced the annually National Award for "Science and Research" for the best scientific articles published throughout the year in the official journal.

ICMJE- Recommendations

Read the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals.

Promoting Global Health

The published medical research literature is a global public good. Medical journal editors have a social responsibility to promote global health by publishing, whenever possible, research that furthers health worldwide.

EVALUAREA EFECTULUI ANTIMICROBIAN AL UNOR SPECII DE BACTERII LACTICE

Elena Rusu, Manole Cojocaru, Cristina Cristescu, Ionela Avram and Diana Pelinescu

REZUMAT

La nivelul tubului gastrointestinal există un echilibru între flora microbiotă şi tractul digestiv, care are ca efect diferenţierea speciilor comensale de speciile bacteriene patogene. Datorită dezvoltării de noi terapii şi utilizării unor compuşi antimicrobieni cu spectru larg de acţiune, în ultima perioadă s-a observat o creştere a numărului de infecţii oportuniste cauzate de tulpini bacteriene şi fungice potenţial patogene. Bacteriile lactice produc compuşi cu activitate antimicrobiană, cum ar fi peroxidul de hidrogen, diacetil, acetaldehidă, izomeri D- ai aminoacizilor, reuterin şi bacteriocine. Utilizarea probioticelor poate reprezenta o alternativă suplimentară în vederea creşterii şi menţinerii stării de sănătate a organismului uman.

Cuvinte cheie: bacterii lactice, antimicrobian, infecţii

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