Tài liệu, ebook Khoa Học Tự Nhiên

4. CONCLUSION A serie of calculations using density functional theory (DFT) employed rather high level of theory B3P86/6-311+G(d) has been performed for searching the possible infrared vibrational spectra of SinMn2+ clusters (n = 5-9), which are not yet available in literature. We believe our finding results would be useful for theoretical unde...

8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 482 | Lượt tải: 0

Trong monoamonphotphat đã chứa 11.0,417 = 4,6%N, do đó phải bổ sung (10 – 4,6) = 5,4%N Hàm lượng cực tiểu của đạm cần phải có trong chất thứ 3 là 5,4:0,25 = 21,6% > %N trong SA  phải bổ sung đạm bằng amoni nitrat hoặc ure

32 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 813 | Lượt tải: 0

4. CONCLUSION In conclusion, the RGO/CNF/PANI exhibits as an effective adsorbent in removing uranium (VI) from aqueous solution in view of their easily magnetic separation and high adsorption capacity. The adsorption process is pH-dependent with maximum adsorption at pH = 5. The adsorption of uranium process onto RGO/CNF/PANI nanocomposites wer...

8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 455 | Lượt tải: 0

Người ta lại lấy 0,75g muối Na2C2O4 có độ tinh khiết là 97% cho phản ứng vừa đủ với 50mL dung dịch KMnO4 đã được axit hóa bằng H2SO4. Tính nồng độ đương lượng của dung dịch KMnO4 đã dùng

22 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 1073 | Lượt tải: 0

4. CONCLUSION The Co79-xZr18+x-yMyB3 (M = Ti, Si, Nb, x = 0 - 2; y = 0 - 4) alloy ribbons were fabricated by melt-spinning method and annealed at different conditions. Concentration of subtituted elements and annealing temperature strongly influence on the structure and magnetic properties of the alloy ribbons. The structure of the alloy ribbon...

11 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 488 | Lượt tải: 0

4. CONCLUSION From the ethyl acetate extract of culture medium of a marine-derived fungus P. chrysogenum 045-357-2, we obtained andrastin A (1) and citreohybridonol (2). The chemical structure of the isolates was elucidated based on MS and NMR spectroscopy and compared with literature data. Compound 2 showed antibacterial activity towards B. ce...

8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 504 | Lượt tải: 0

4. CONCLUSION Silver nanoparticles with different particle sizes were successfully synthesized by gamma Co-60 irradiation method using chitosans at different concentrations and degrees of deacetylation as stabilizers. The synthesized AgNPs/chitosan products showed a strong inhibition effect against C. capssiicola with the antifungal efficiency ...

10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 520 | Lượt tải: 0

4. CONCLUSION We have successfully applied the identification based on morphology and phylogenetics relying on nrLSU sequence to analyze the samples of entomopathogenic fungi (DL0038A and DL0038B) from the mountainous region of Langbian, Dalat and concluded that these samples are Cordyceps takaomontana. This research will be continued with the...

8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 491 | Lượt tải: 0

4. DISCUSSIONS For safety concern, ethanol was used as solvent for flavonoids and phenolic compounds extraction. Besides the suitable concentration, temperature and soaking time also contribute to extraction efficiency. The result confirms that extraction using 90o ethanol gave highest efficiency with 0.11 g phenolic compounds (gram rutin equiv...

8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 467 | Lượt tải: 0

Ví duï: phaûn öùng toång hôïp HCl töø H2 vaø Cl2 khi ñöôïc chieáu saùng seõ xaûy ra theo kieåu daây chuyeàn: Cl : Cl  2 Cl. ; Cl. + H : H  HCl + H. ; H. + Cl : Cl  HCl + H.

45 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 571 | Lượt tải: 0