Abstract:
BACKGROUND:Salivary nitrate is positively correlated with plasma nitrate and its level is 9 times the plasma level after nitrate loading. Nitrate in saliva is known to be reduced to nitrite by oral bacteria. Nitrate and nitrite levels in saliva are 3 - 5 times those in serum in physiological conditions respectively in our previous study. The biological functions of high salivary nitrate and nitrite are still not well understood. The aim of this in vitro study was to investigate the antimicrobial effects of nitrate and nitrite on main oral pathogens under acidic conditions. METHODS:Six common oral pathogens including Streptococcus mutans NCTC 10449, Lactobacillus acidophilus ATCC 4646, Porphyromonas gingivalis ATCC 33277, Capnocytophaga gingivalis ATCC 33624, Fusobacterium nucleatum ATCC 10953, and Candida albicans ATCC 10231 were cultured in liquid medium. Sodium nitrate or sodium nitrite was added to the medium to final concentrations of 0, 0.5, 1, 2, and 10 mmol/L. All of the microorganisms were incubated for 24 to 48 hours. The optical densities (OD) of cell suspensions were determined and the cultures were transferred to solid nutrient broth medium to observe the minimum inhibitory concentration and minimum bactericidal/fungicidal concentration for the six tested pathogens. RESULTS:Nitrite at concentrations of 0.5 to 10 mmol/L had an inhibitory effect on all tested organisms at low pH values. The antimicrobial effect of nitrite increased with the acidity of the medium. Streptococcus mutans NCTC 10449 was highly sensitive to nitrite at low pH values. Lactobacillus acidophilus ATCC 4646 and Candida albicans ATCC 10231 were relatively resistant to acidified nitrite. Nitrate at the given concentrations and under acidic conditions had no inhibitory effect on the growth of any of the tested pathogens. CONCLUSION:Nitrite, at a concentration equal to that in human saliva, is both cytocidal and cytostatic to six principal oral pathogens in vitro, whereas nitrate at a similar concentration has no antimicrobial effect on these organisms.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Xia DS,Liu Y,Zhang CM,Yang SH,Wang SLsubject
Has Abstractpub_date
2006-11-20 00:00:00pages
1904-9issue
22eissn
0366-6999issn
2542-5641journal_volume
119pub_type
杂志文章abstract:BACKGROUND:Acinetobacter baumanii (A. baumanii ) remains an important microbial pathogen resulting in nosocomial acquired infections with significant morbidity and mortality. The mechanism by which nosocomial bacteria, like A. baumanii, attain multidrug resistance to antibiotics is of considerable interest. The aim in ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-09-01 00:00:00
abstract:BACKGROUND:The reverse obliquity inter-trochanteric fracture is a distinct fracture pattern that is mechanically different from most inter-trochanteric fractures and the optional treatment of it is still controversial. The purpose of this study was to compare differences in the efficacy of a novel nail (medial support ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000001031
更新日期:2020-11-20 00:00:00
abstract::This paper reports the results of serological survey of 318,912 persons for nasopharyngeal carcinoma (NPC) in 21 cities and counties of south China. There were 8,441 persons with positive VCA-IgA antibody (single item positive) of EB virus (EBV), with a rate of 2.65%. In these VCA-IgA positive persons, 287 persons als...
journal_title:Chinese medical journal
pub_type: 杂志文章,多中心研究
doi:
更新日期:1995-04-01 00:00:00
abstract:BACKGROUND:Survivin is an oncoprotein silenced in normal mature tissues but reactivated in serous ovarian cancer (SOC). Although transcriptional activation is assumed for its overexpression, the long 3'-untranslated region (3'-UTR) in survivin gene, which contains many alternate polyadenylation (APA) sites, implies a p...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.181965
更新日期:2016-05-20 00:00:00
abstract:OBJECTIVE:To study the relationship between cartilage end-plate calcification and intervertebral disc degeneration. METHODS:An experimental model of cervical disc degeneration in rabbits was established by resection of the cervical supraspinous and interspinous ligaments and detachment of the posterior paravertebral m...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2001-03-01 00:00:00
abstract:BACKGROUND:Methicillin-resistant Staphylococcus aureus (MRSA) pneumonia is an important issue with significant morbidity and mortality in clinical practice, especially in diabetes mellitus (DM). Studies focusing on S. aureus pneumonia in DM is limited, we sought to make a relatively comprehensive exploration of clinica...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000000270
更新日期:2019-06-20 00:00:00
abstract:OBJECTIVE:Renal fibrosis is the most common manifestation of chronic kidney disease (CKD). Noting that existing treatments of renal fibrosis only slow disease progression but do not cure it, there is an urgent need to identify novel therapies. Hydrogen sulfide (H2S) is a newly discovered endogenous small gas signaling ...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:10.1097/CM9.0000000000000537
更新日期:2019-12-05 00:00:00
abstract:OBJECTIVE:To assess the therapeutic effects of long-term albendazole therapy in intraabdominal cystic echinococcosis. METHODS:Fifteen patients with a total of 45 cysts were treated with albendazole with dosage regimen of 20 mg.kg-1.d-1 for an average of 2.5 years. Repeated CT and ultrasound scannings (US) were perform...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2000-09-01 00:00:00
abstract:BACKGROUND:Septicemia and inflammation-mediated septic shock caused by Vibrio vulnificus (VV) is strongly associated with chronic liver disease. This study examined the effects of antimicrobial therapy on expression of hepatic toll-like receptors and inflammatory cytokines in rats with alcohol-induced liver disease com...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2009-08-20 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-10-01 00:00:00
abstract::A 30-year-old female patient with coexisting ankylosing spondylitis and rheumatoid arthritis was diagnosed and treated. The human leukocyte antigen (HLA)-B27 is a predisposing factor of ankylosing spondylitis and HLA-DR4 is a predisposing factor of rheumatoid arthritis. This patient was HLA-B27 and HLA-DR4 positive, a...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2011-10-01 00:00:00
abstract:BACKGROUND:Intratracheal instillation of blood induces self-repaired acute lung injury. However, the mechanism of repair has been unclear. Heme-oxygenase (HO)-1, which catalyzes heme breakdown, acts as an inducible defense against oxidative stress and plays an important role in inflammation. The objective of this study...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2008-09-05 00:00:00
abstract:BACKGROUND:Aerosolized amikacin (AA) is a current option for the management of ventilator-associated pneumonia (VAP) caused by multidrug-resistant Gram-negative bacteria (MDR-GNB), as it is reported that AA could increase the alveolar level of the drug without increasing systemic toxicity. This study aimed to evaluate ...
journal_title:Chinese medical journal
pub_type: 杂志文章,随机对照试验
doi:10.4103/0366-6999.205846
更新日期:2017-05-20 00:00:00
abstract:OBJECTIVE:To understand the relationship among congenital choledochal cyst, anomalous junction of pancreaticobiliary duct (AJPBD) and pancreatitis. METHODS:25 children with choledochal cyst treated in our hospital were included in this study. Their ages ranged from 2 months to 14 years. Intraoperative cholangiography ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1999-07-01 00:00:00
abstract:BACKGROUND:The acute abdomen remains a challenge for all obstetricians and physicians who take part in the care of women in pregnancy. To add substantially to our understanding of acute pancreatitis (AP) in pregnancy, in particular affirming the increased risks for mother and fetus associated with AP, we explored featu...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2011-09-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2004-11-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:The role of plasma high sensitivity C-reactive protein (hs-CRP) in in-stent restenosis (ISR) remains controversial. We investigated plasma hs-CRP level at both admission and follow-up in patients with stable angina (SA) after successful coronary stenting in order to clarify the predictive value of hs-CRP for...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2011-03-01 00:00:00
abstract:BACKGROUND:Collagen VI-related myopathies are autosomal dominant and recessive hereditary myopathies, mainly including Ullrich congenital muscular dystrophy (UCMD) and Bethlem myopathy (BM). Muscle magnetic resonance imaging (MRI) has been widely used to diagnosis muscular disorders. The purpose of this study was to ev...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.186638
更新日期:2016-08-05 00:00:00
abstract::The surface structure of four different articular cartilages of the femoral head was studied with scanning electron microscope in 12 cases of hip joint osteoarthritis. These articular cartilages were mink white, yellow, dusky red and hyperplastic and thickened. The osteoarthritic articular cartilage surface was uneven...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1990-04-01 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.215338
更新日期:2017-10-05 00:00:00
abstract:BACKGROUND:There are few studies to assess whether propofol attenuates myocardial ischemia-reperfusion injury via a mechanism related to nitric oxide (NO) route, so we designed this randomized blinded experiment to observe the changes of NO contents, nitric oxide synthase (NOS) activity, NOS contents in the myocardium,...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2009-12-20 00:00:00
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journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2003-07-01 00:00:00
abstract:Background:The effect of maternal weights on the risk of iron deficiency anemia (IDA) during pregnancy remains unclear. The study aimed to investigate the association between maternal weight indicators and IDA during pregnancy. Methods:We conducted a cohort study to examine the association between maternal weight indi...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.4103/0366-6999.244109
更新日期:2018-11-05 00:00:00
abstract:OBJECTIVE:To explore the mechanism of autoimmune hemolysis and establish a more sensitive test for autoimmune hemolytic anemia (AIHA). METHODS:IgG subclasses were tested in 40 patients with idiopathic or secondary AIHA by Coombs test with monoclonal antibodies. Hb, TBil, RC and FHb, as hemolytic parameters, were used ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:1999-09-01 00:00:00
abstract:BACKGROUND:Increased risk of atherosclerosis has been reported in patients with human immunodeficiency virus (HIV) infection since highly active antiretroviral therapy (HAART) has come into use. However, there is no clear evidence of premature atherosclerosis in Chinese HIV-infected patients. Our study was designed to ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2010-12-01 00:00:00
abstract:BACKGROUND:Studies have reported that low bone mineral density (BMD) is prevalent in human immunodeficiency virus (HIV)-infected patients; however, the factors that contribute to HIV-related BMD changes are yet to be fully understood. Due to the application of dual X-ray absorptiometry (DXA) among a select group of hos...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:10.1097/CM9.0000000000001317
更新日期:2020-12-03 00:00:00
abstract:BACKGROUND:Continuous interscalene nerve block (CISB) is considered to be the most effective method for postoperative analgesia after shoulder surgery with prolonged severe pain. This study was performed to evaluate the minimum effective background infusion rate and the effective background infusion rate of ropivacaine...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00
abstract:OBJECTIVE:To review the advances of studies on vitamin D receptor and its role in the pathogenesis of diabetic nephropathy. DATA SOURCES:A comprehensive search of the PubMed literatures without restriction on the publication date was carried out using keywords such as vitamin D receptor and diabetic nephropathy. STUD...
journal_title:Chinese medical journal
pub_type: 杂志文章,评审
doi:
更新日期:2014-01-01 00:00:00
abstract:BACKGROUND:Preeclampsia, characterized by hypertension and proteinuria, is a multifactorial disease associated with shallow invasion of trophoblast cells and inadequate spiral artery remodeling. Trophoblast and tumor cells have similar invasion mechanism. Prostasin is closely related to tumor development, invasion and ...
journal_title:Chinese medical journal
pub_type: 杂志文章
doi:
更新日期:2014-01-01 00:00:00