Bovine pericardium for heart valve bioprostheses:in vitro andin vivo characterization of new chemical treatments

1994 ◽  
Vol 5 (12) ◽  
pp. 850-854 ◽  
Author(s):  
E. Pasquino ◽  
S. Pascale ◽  
M. Andreon ◽  
S. Rinaldi ◽  
F. Laborde ◽  
...  
Keyword(s):  
Heart Valve ◽  
Bovine Pericardium ◽  
Chemical Treatments

Cuspal Dehiscence at a Post and Along the Stent Cloth in a Bovine Pericardium Heart Valve Implanted for Seven Years

2012 ◽  
Vol 22 (2) ◽  
pp. 95-111 ◽  
Author(s):  
Robert Guidoin ◽  
Taniela Marli Bes ◽  
Tomas Francisco Cianciulli ◽  
Julianne Klein ◽  
Bin Li ◽  
...  
Keyword(s):  
Heart Valve ◽  
Bovine Pericardium

DRIFT spectroscopic characterization of coal samples modified by chemical treatments

Fuel ◽  
1996 ◽  
Vol 75 (13) ◽  
pp. 1549-1556 ◽  
Author(s):  
Igor E. Nosyrev ◽  
Rene Gruber ◽  
Denise Cagniant ◽  
Andrzej Krzton ◽  
Janusz Pajak ◽  
...  
Keyword(s):  
Spectroscopic Characterization ◽  
Chemical Treatments

Characterization of a Novel Polymeric Trileaflet Heart Valve Prosthesis

2009 ◽  
Author(s):  
Scott C. Corbett ◽  
Neil Verma ◽  
Parnian Boloori Zadeh ◽  
Ahmet U. Coskun ◽  
Hamid N.-Hashemi
Keyword(s):  
Heart Valve ◽  
Heart Valves ◽  
Structural Changes ◽  
Survival Rates ◽  
Valve Prosthesis ◽  
Improve Patient Survival ◽  
Limited Life ◽  
Valve Prostheses ◽  
Improve Patient

While heart valve prostheses have been used successfully since 1960, 10-year survival rates still range from 37–58% [1]. The underlying problem with bioprostheses is a limited life from structural changes such as calcification and leaflet wear, leading to valve failure [2]. Biological tissue fixation and methods used to mount the tissue to a supporting stent can be blamed for this shortcoming. The underlying problem with mechanical heart valves is the presence of a centrally located leaflet, or occluder. It propagates high velocity jets, turbulence and areas of stagnation: the disturbances which necessitate anticoagulation [3]. A polyurethane valve has the potential to improve upon the shortcomings of existing valves and ultimately improve patient survival.

Modification and Characterization of Polyethylene Glycolated Decellularized Porcine Aortic Heart Valve with Osteoprotegerin

2017 ◽  
Vol 7 (1) ◽  
pp. 53-58
Author(s):  
Yang Li ◽  
Zhigang Zhu ◽  
Jingli Ding ◽  
Wei Yang ◽  
Yi Gong ◽  
...  
Keyword(s):  
Heart Valve ◽  
Aortic Heart Valve

Modeling of Tissue Fatigue Damage in Bio-Prosthetic Heart Valve

2011 ◽  
Author(s):  
Caitlin Martin ◽  
Wei Sun
Keyword(s):  
Fatigue Damage ◽  
Heart Valve ◽  
Anticoagulant Therapy ◽  
Heart Valves ◽  
Prosthetic Heart Valve ◽  
Bovine Pericardium ◽  
Prosthetic Heart Valves ◽  
Mechanical Valves ◽  
In Vivo Degradation

Bio-prosthetic heart valves (BHVs) with leaflets made of glutaraldehyde-treated bovine pericardium (GLBP), have been used extensively to replace diseased heart valves. BHVs display superior hemodynamics to mechanical valves and eliminate the need for anticoagulant therapy; however, they exhibit poor durability resulting from in vivo degradation and fatigue damage of the leaflets.

Isolation and characterization of a bacteriocin produced by Bacillus stearothermophilus strain NU-10

1976 ◽  
Vol 22 (12) ◽  
pp. 1743-1750 ◽  
Author(s):  
Ronald Yule ◽  
B. D. Barridge
Keyword(s):  
Molecular Weight ◽  
Stationary Phase ◽  
Bacillus Stearothermophilus ◽  
Proteolytic Enzymes ◽  
Small Molecular Weight ◽  
Optimal Production ◽  
Chemical Treatments ◽  
Neutral Ph ◽  
Isolation And Characterization

Broth-grown cultures of Bacillus stearothermophilus strain NU-10 produce a bacteriocin which exerts lethal activity on other strains of the bacterium. Optimal production occurs during late maximum stationary phase of growth, at neutral pH, and 55–65 °C. The bacteriocin can be substantially purified by a combination of precipitations, centrifugations, and gel filtrations. The thermocin is composed of protein and carbohydrate. It is partially destroyed by proteolytic enzymes but is resistant to DNase, RNase, and various chemical treatments. The bacteriocin has a small molecular weight and exhibits considerable thermostability.

scholarly journals Isolation and characterization of Streptococcus mutans in heart valve and dental plaque specimens from a patient with infective endocarditis

2006 ◽  
Vol 55 (8) ◽  
pp. 1135-1140 ◽  
Author(s):  
Ryota Nomura ◽  
Kazuhiko Nakano ◽  
Hirotoshi Nemoto ◽  
Kazuyo Fujita ◽  
Satoko Inagaki ◽  
...  
Keyword(s):  
Infective Endocarditis ◽  
Dental Caries ◽  
Oral Cavity ◽  
Streptococcus Mutans ◽  
Heart Valve ◽  
Dental Plaque ◽  
Biochemical Properties ◽  
Oral Streptococci ◽  
Isolation And Characterization

Streptococcus mutans, known to be an aetiologic agent of dental caries, also causes infective endocarditis (IE), although a comparison of isolates from the oral cavity and infected heart valve of the same patient has not been reported. In the present study, infected heart valve and dental plaque samples from a patient with IE were analysed. Broad-range PCR with DNA sequencing revealed that 50 clones from the dental plaque isolates were composed of oral streptococci and periodontopathic bacteria, whereas only Streptococcus mutans was detected in 50 clones from the heart valve. Eighteen strains of Streptococcus mutans were isolated from dental plaque and seven from the heart valve, and the biochemical properties of each were in accordance with those of Streptococcus mutans. DNA fingerprinting analysis revealed that all the oral isolates of Streptococcus mutans had similar patterns, which were different from those of the isolates from the infected heart valve. Western blotting using glucosyltransferase (GTF)-specific antiserum showed that the seven strains from the heart valve lacked the three types of intact GTF. In addition, the sucrose-dependent adhesion rates of these isolates were significantly lower than those of the oral isolates (P<0.001). Furthermore, the isolates from the heart valve were less susceptible to erythromycin and kanamycin. These results indicate that the properties of the Streptococcus mutans strains isolated from the infected valve were different from those of typical oral strains, which may be related to the effects of IE.

Structural Characterization of α-Terminal Group of Natural Rubber. 2. Decomposition of Branch-Points by Phospholipase and Chemical Treatments

2005 ◽  
Vol 6 (4) ◽  
pp. 1858-1863 ◽  
Author(s):  
Lucksanaporn Tarachiwin ◽  
Jitladda Sakdapipanich ◽  
Koichi Ute ◽  
Tatsuki Kitayama ◽  
Yasuyuki Tanaka
Keyword(s):  
Natural Rubber ◽  
Structural Characterization ◽  
Terminal Group ◽  
Branch Points ◽  
Chemical Treatments
Sign in / Sign up

Export Citation Format

Share Document