116 research outputs found
The canopy shape (without any branches toward the south-west) and the very irregular profile of stem IV (in front) suggest that another stem must have collapsed in its vicinity.
No full text<p>(The photograph was taken by Adrian Patrut).</p
Collecting the oldest sample (Nr. 2) from the false cavity of the Lebombo baobab.
No full text<p>(The photograph was taken by Adrian Patrut).</p
The image shows the relict stem in front of stem III.
No full text<p>The pronounced convex shape of stem III indicates that it had to conform to the shape of the older relict stem. (The photograph was taken by Adrian Patrut).</p
Age, growth and death of a national icon: the historic Chapman baobab of Botswana
Get PDF© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Patrut, A., Woodborne, S., Patrut, R. T., Hall, G., Rakosy, L., Winterbach, C., & von Reden, K. F. Age, growth and death of a national icon: the historic Chapman baobab of Botswana. Forests, 10(11), (2019): 983, doi: 10.3390/f10110983.The year 2016 witnessed the fall of a symbol of the botanical world: the historic Chapman baobab of Botswana. This article presents the results of our investigation of the standing and fallen tree. The Chapman baobab had an open ring-shaped structure composed of six partially fused stems. Several wood samples collected from the stems prior and after their collapse were analysed by using radiocarbon dating. The radiocarbon date of the oldest sample was 1381 ± 22 BP, which corresponds to a calibrated age of 1345 (+10, −15) calendar years. The dating results show that the six stems of the Chapman baobab belonged to three different generations, which were 1350–1400, 800–1000 and 500–600 years old. The growth rate variation of the largest and oldest stem is presented and correlated with the climate evolution in the area over the past 1000 years. The factors that determined the sudden fall and death of the Chapman baobab are also presented and discussed.The research was funded by the Romanian Ministry of National Education CNCS-UEFISCDI under grant PN-III-P4-ID-PCE-2016-0776, No. 90/2017
Chemistry and the forms aesthetics
No full textMüller A, Patrut A. Chemistry and the forms aesthetics. REVISTA DE CHIMIE. 2001;52(6):289-298.The paper presents the complex problem of the relationship between the molecules of the chemist and their models, on the one hand, and the so-called aesthetics of forms, on the other. In this sense, molecules with suggestive names, such as Fullerenes, Superfullerenes, Keplerates, giant spheres and giant wheels are presented and discussed. The existence of connections between the beautiful molecules with high degree of symmetry, corresponding to the Platonic and Archimedean solids, and similar forms found in nature, in living systems, are established
Radiocarbon dating of Makuri Le boom, a very old African baobab from Nyae Nyae, Namibia
Get PDF© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Patrut, R. T., Patrut, A., Rakosy, D., Rakosy, L., Lowy, D. A., Von Redenf, K. F., & Bodis, J. Radiocarbon dating of Makuri Le boom, a very old African baobab from Nyae Nyae, Namibia. Studia Universitatis Babes-Bolyai Chemia, 65(2), (2020): 149-159, doi:10.24193/subbchem.2020.2.12.The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of Makuri Lê boom, a very large African baobab from Nyae Nyae Conservancy, Namibia. The investigation of this superlative baobab shows that it consists of 12 independent stems of different dimensions, which belong to three generations. Makuri Lê boom has an open ring-shaped structure, a type of architecture which allows baobabs to reach very large sizes and old ages. The oldest sample has a radiocarbon date of 1602 ± 17 BP, which corresponds to a calibrated age of 1520 ± 35 calendar yr. By this value, Makuri Lê boom becomes one of the oldest dated baobabs and angiosperms with accurate dating results.The research was funded by the Romanian Ministry of National Education CNCS-UEFISCDI under grant PN-III-P4-ID-PCE-2016-0776, Nr. 90/2017
General view of the Lebombo baobab, showing also the high entrance to the cavity.
No full text<p>The photograph is taken from the Eco Trail 4x4 of the Kruger National Park. One can observe the fence which marks the border between South Africa and Mozambique. (The photograph was taken by Roxana Patrut).</p
Electrochemical investigation of molecular growth of the {Mo57V6} polyoxometalate cluster
No full textNicoara A, Patrut A, Margineanu D, Müller A. Electrochemical investigation of molecular growth of the {Mo57V6} polyoxometalate cluster. ELECTROCHEMISTRY COMMUNICATIONS. 2003;5(6):511-518.The reduction of the {Mo57V6} polyoxometalate cluster which shows an interesting molecular growth process, modelling biological molybdenum uptake into a storage protein, was investigated electrochemically. The electrochemical features of the growth process were studied by using cyclic voltammetry, either as such or associated with bulk electrolysis. Resonance Raman spectroscopy was also used to identify the reduction products. (C) 2003 Elsevier Science B.V. All rights reserved
Infinite octamolybdate chains cross-linked by paramagnetic iron (II) centers
No full textPatrut A, Nicoara A, Margineanu D, et al. Infinite octamolybdate chains cross-linked by paramagnetic iron (II) centers. CENTRAL EUROPEAN JOURNAL OF CHEMISTRY. 2004;2(2):323-333.The paper presents a new polymeric polyoxomolybdate cluster with infinite octamolybdate chains cross-linked by iron (II) centers. The layer-type substance contains sodium cations sandwiched between the [Fe(H2O)(4)Mo8O27](infinity) layers. The structure was determined by single crystal X-ray diffraction analysis. Magnetic properties, due to the presence of paramagnetic iron ( II) centers, are presented and discussed. (C) Central European Science Journals. All rights reserved
Cross-linking polymeric octamolybdate chains with paramagnetic manganese(II) centres
No full textMüller A, Patrut A, Nicoara A, et al. Cross-linking polymeric octamolybdate chains with paramagnetic manganese(II) centres. REVUE ROUMAINE DE CHIMIE. 2002;47(10-11):997-1003.The paper reports the cross-linking of octamolybdate chains by manganese(II) centres, which results in the formation of extended layer-type structures, The two new synthesized compounds contain sodium, respectively manganese(II) cations sandwiched between the (Mn(H2O)(4)Mo8O27)(infinity) layers. The structures of the layer-type compounds were established by single crystal X-ray analysis. Magnetic properties, due to the presence of paramagnetic manganese(II) centres, are also discussed
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