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All Journal Eksergi: Chemical Engineering Journal Jurnal Matematika dan Ilmu Pengetahuan Alam Jurnal Kimia Riset JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Abdi: Media Pengabdian Kepada Masyarakat Jurnal Layanan Masyarakat (Journal of Public Service) Berkala Penelitian Hayati
Handoko Darmokoesoemo
Departemen Kimia, Fakultas Sains Dan Teknologi, Universitas Airlangga
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Education Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Social Sciences Other

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Journal : Berkala Penelitian Hayati

 1 
STUDI MEKANISME KINETIKA REAKSI PERTUKARAN ION FE(III) ANTARA DUA JENIS LIGAN SIDEROPHORE BAKTERI (DESFERRIFERRIOXAMINE B DAN AZOVERDINE) DENGAN LIGAN EDTA Handoko Darmokoesoemo; A.M. Albrecht Gary
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 1 No 2 (1995): December 1995
Publisher : The East Java Biological Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (476.885 KB) | DOI: 10.23869/178

Abstract

The kinetics of iron exchange and iron removal from two siderophore complex with use of ethylenediaminetetraacetic acid (EDTA) have been examined, using UV-Vis spectrophotometric method. Iron exchange between the ferric complexes of desferriferrioxamine B (siderophore produced by microorganism Azomonas macrocy-togenes) with EDTA was extremely slow under conditions at pH 7.4 and 25oC. Furthermore, pH dependence studies demonstrated that the exchange rate was accelerated as a function of increasing hydrogen ion concentration. Kinetics of iron removal from ferrioxamine B and the ferric complexe of azoverdine with excess of EDTA, show firt-order dependence on the concentration of the iron complex and hydrogen ion at 25oC with first-order rate constant of the dissociation of a ternary complex formed of (16 ±0.4) x 10-3s-1 and (1.3 ±0.2) x 10-2s-1 respectivy at pH region between 3.67 and 5.23. variation of pseudo first order rate constant kobs with hydrogen ion concentration shows a saturation kinetics at high constant ligand EDTA concentration (3.0 x 10-2 M) and at low pH region (3.67). the result were interpreted in terms of three-step mechanism, involving : (1) protonation of the ferrioxamine B comples and the ferric comples of azoverdine and (2) subsequent biomolecular reaction with EDTA.
KOMPOSISI KIMIA SUBSTRAT ASOSIASI Sonneratia alba - Avicennia marina DI MUARA SUNGAI LEKOK KABUPATEN PASURUAN Hani Sudarmanto; Mas Loegito; Trisnadi Widyoleksono C.P.; Handoko Darmokoesoemo; Sediono
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 3 No 2 (1997): December 1997
Publisher : The East Java Biological Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23869/512

Abstract

The mangrove forest occurred in the north coast of Pasuruan Regency have not been reported about the vegetational and substrate compositions. The research's purpose were to analysis the vegetational composition and the chemical properties of the substrate. The result showed that this mangrove forest were dominated by association of Sonneratia alba - Avicennia marina. The result showed that soils had the natural reaction (pH 7.01-7.65), low in organic matter (2.18-4.27%) and total nitrogen (0.48-0.51%), but high in total phosphorus (15.19-29.22 ppm) and in exchangeable cation (Ca2+: 389.855-504.065 mg/100 gr, Mg2+: 409.522-441.400 mg/100 gr, K+: 228.900-390-435 mg/100 gr).
Co-Authors A. Budi Prasetya A.M. Albrecht Gary Adiarto, Totok AFAF BAKTIR Ahmadi Jaya Permana Alfa Akustia Widati Aziz, Rizky Abdul Badrud Tamam Ibnu Ali Budi Prasetyo, Antonius Denny Ika Rahmawati Eko Prasetyo Kuncoro Fatiha Khairunnisa Fetty, Amelia Julia Tria Ganden Supriyanto Hani Sudarmanto Harsasi Setyawati Hartati Hartati Hartati Hartati Hidayat, Muchlis Fajar Hwei Voon, Lee Ishma, Ervina Fadhilatul Kautsar Ul Haq Mas Loegito Matondang, Claudia Deborah Pretty Mirartul Khasanah Miratul Khasanah Mochamad Zakki Fahmi Mulyadi Tanjung Nadhifa Aliyya Himawan Nesti Widayanti Ni Nyoman Tri Puspaningsih Prasetyo, Antonius Budi Purkan Purkan, Purkan Purwaningsih, Aning Putri, Devi Indrasari Mustopa Qurrota A’yuni Rico Ramadhan, Rico Salsabila, Fara Sastra, Richad Ade Sediono, Sediono Sofijan Hadi Sri Sumarsih Suyanto suyanto Tokok Adiarto Totok Ardiarto Trisnadi Widyaleksono Catur Putranto Yanuardi Raharjo, Yanuardi