Nitrogen-base atmosphere for chemicothermal treatment

1980 ◽  
Vol 22 (9) ◽  
pp. 652-654
Author(s):  
A. G. Bozhkov ◽  
S. L. Rustem ◽  
T. A. Fedorova
Keyword(s):  
Chemicothermal Treatment ◽  
Nitrogen Base

Characterization of Antibacterial-Producing Endophytic Fungi of Syzygiumpolyanthum Leaves

2020 ◽  
Vol 20 (4) ◽  
pp. 448-454
Author(s):  
Rahmita Burhamzah ◽  
Gemini Alam ◽  
Herlina Rante
Keyword(s):  
Molecular Characterization ◽  
Endophytic Fungi ◽  
Morphological Characterization ◽  
Test Method ◽  
Analysis Method ◽  
Nitrogen Base ◽  
Rdna Genes ◽  
Antibacterial Screening ◽  
Planting Method

Background: Endophytic fungi live in plants’ tissue and can produce the same bioactive compounds as its host plant produces. Syzygiumpolyanthum leaves have known to be one of the antibacterial compound producers. Aim and Objective: This study aimed to characterize morphologically, microscopically, and molecularly the antibacterial-producing endophytic fungi of Syzygiumpolyanthum leaves. Methods: The isolation of endophytic fungi was done by fragment planting method on PDA medium. The antibacterial screening was performed using the antagonistic test as the first screening followed by the disc diffusion test method. The morphological characterization was based on isolate’s mycelia color, growth pattern, margin, and surface texture of the colony, while the microscopic characterization was based on its hyphae characteristics. The molecular characterization of the isolate was done by nitrogen base sequence analysis method on nucleotide constituent of ITS rDNA genes of the isolate. Results: The results found that isolate DF1 has antibacterial activity against E.coli, S.aureus, P.acne, and P.aeruginosa, with the greatest inhibition at 10% concentration of broth fermentation extract on S.aureus with a diameter of inhibition of 13.77 mm. Conclusion: Based on macroscopic, microscopic, and molecular characterization, DF1 isolate is similar to Ceriporialacerate.

scholarly journals A nitrogen-base catalyzed generation of organotin(ii) hydride from an organotin trihydride under reductive dihydrogen elimination

2015 ◽  
Vol 6 (8) ◽  
pp. 4737-4751 ◽  
Author(s):  
Christian P. Sindlinger ◽  
Andreas Stasch ◽  
Holger F. Bettinger ◽  
Lars Wesemann
Keyword(s):  
Reductive Elimination ◽  
Nitrogen Base

Amine bases are shown to induce reductive elimination of dihydrogen from terphenyltin trihydride.

Sintering Stainless Steels with Boron Addition in Nitrogen Base Atmosphere

2007 ◽  
Vol 534-536 ◽  
pp. 733-736 ◽  
Author(s):  
J. Abenojar ◽  
D. Esteban ◽  
M.A. Martinez ◽  
Francisco Velasco
Keyword(s):  
Stainless Steel ◽  
Boron Nitride ◽  
Bending Strength ◽  
Wear Behavior ◽  
Dimensional Change ◽  
Nuclear Industry ◽  
Boron Addition ◽  
Stainless Steel 316L ◽  
Nitrogen Base ◽  
Chromium Nitrides

Stainless steel has become increasingly used in the nuclear industry recently. Thus, this study is aimed at investigating stainless steel 316L with boron addition and the possibility of sinter these materials in nitrogen rich atmospheres. By analyzing the final product, the properties of the stainless steel 316L (good mechanical properties and high corrosion resistance) with the boron neutron absorption properties were found to unify. The P/M technologies enable higher boron quantities to be added to the steel. This was not possible with the solidification conventional technologies, as segregation is produced in the latter. Mixtures with 0.75 and 1.5% boron were prepared. Uniaxial compaction (at 700 MPa) was carried out to study the green density of compacted materials. The sintering atmosphere used was N2-10%H2-0.1%CH4, and was used to form boron nitrides instead of chromium nitrides. Although some boron nitride was formed, not all chromium nitride formation was avoided. The sintered samples were characterized through their physical properties (density and dimensional change), chemical analysis (carbon and nitrogen contents), mechanical behavior (bending strength and hardness) and wear behavior. To finish the materials characterization, a microstructural study is proposed. Lastly, the wear tracks were observed by SEM. Boron nitride has precipitated in grain boundaries, making more difficult the sintering of the material and reducing the properties of the stainless steel.

Effect of conditions of complex chemicothermal treatment on residual stress distribution

1993 ◽  
Vol 28 (1) ◽  
pp. 98-100
Author(s):  
M. F. Berezhnitskaya ◽  
A. K. Tikhonov ◽  
N. V. Bogdanova
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Chemicothermal Treatment ◽  
Residual Stress Distribution

Residual stresses in alloys after chemicothermal treatment

1967 ◽  
Vol 9 (3) ◽  
pp. 165-168
Author(s):  
A. I. Efimov ◽  
S. T. Kishkin ◽  
V. V. Nikolenko ◽  
M. S. Khazanov
Keyword(s):  
Residual Stresses ◽  
Chemicothermal Treatment

Use of glow-discharge for chemicothermal treatment

1967 ◽  
Vol 9 (3) ◽  
pp. 162-164
Author(s):  
O. I. Butenko ◽  
Yu. N. Krymskii ◽  
Yu. M. Lakhtin
Keyword(s):  
Glow Discharge ◽  
Chemicothermal Treatment

scholarly journals Flow Cytometry Antifungal Susceptibility Testing of Pathogenic Yeasts other than Candida albicans and Comparison with the NCCLS Broth Microdilution Test

2000 ◽  
Vol 44 (10) ◽  
pp. 2752-2758 ◽  
Author(s):  
Rama Ramani ◽  
Vishnu Chaturvedi
Keyword(s):  
Flow Cytometry ◽  
Candida Albicans ◽  
Amphotericin B ◽  
Susceptibility Testing ◽  
Antifungal Susceptibility ◽  
Antifungal Susceptibility Testing ◽  
Broth Microdilution ◽  
Nitrogen Base ◽  
Microdilution Method ◽  
Broth Microdilution Method

ABSTRACT Candida species other than Candida albicansfrequently cause nosocomial infections in immunocompromised patients. Some of these pathogens have either variable susceptibility patterns or intrinsic resistance against common azoles. The availability of a rapid and reproducible susceptibility-testing method is likely to help in the selection of an appropriate regimen for therapy. A flow cytometry (FC) method was used in the present study for susceptibility testing ofCandida glabrata, Candida guilliermondii,Candida krusei, Candida lusitaniae,Candida parapsilosis, Candida tropicalis, andCryptococcus neoformans based on accumulation of the DNA binding dye propidium iodide (PI). The results were compared with MIC results obtained for amphotericin B and fluconazole using the NCCLS broth microdilution method (M27-A). For FC, the yeast inoculum was prepared spectrophotometrically, the drugs were diluted in either RPMI 1640 or yeast nitrogen base containing 1% dextrose, and yeast samples and drug dilutions were incubated with amphotericin B and fluconazole, respectively, for 4 to 6 h. Sodium deoxycholate and PI were added at the end of incubation, and fluorescence was measured with a FACScan flow cytometer (Becton Dickinson). The lowest drug concentration that showed a 50% increase in mean channel fluorescence compared to that of the growth control was designated the MIC. All tests were repeated once. The MICs obtained by FC for all yeast isolates except C. lusitaniae were in very good agreement (within 1 dilution) of the results of the NCCLS broth microdilution method. Paired ttest values were not statistically significant (P = 0.377 for amphotericin B; P = 0.383 for fluconazole). Exceptionally, C. lusitaniae isolates showed higher MICs (2 dilutions or more) than in the corresponding NCCLS broth microdilution method for amphotericin B. Overall, FC antifungal susceptibility testing provided rapid, reproducible results that were statistically comparable to those obtained with the NCCLS method.

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