Rakosy Laszlo

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Rakosy

First Name

Laszlo

ORCID

0000-0002-7793-6996

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Now showing 1 - 16 of 16

African baobabs with double closed ring-shaped structures and two separate false cavities : radiocarbon investigation of the baobab of Golconda Fort

(Studia Chemia, 2016) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Bodis, Jeno ; Lowy, Daniel A. ; Forizs, Edit ; von Reden, Karl F.

The article discloses the results of radiocarbon investigation of the baobab of Golconda Fort, Hyderābād, India, which is the largest African baobab outside Africa. Two wood samples were collected from the large inner cavity; of these we extracted several segments for AMS (accelerator mass spectrometry) radiocarbon dating. The oldest sample segment had a radiocarbon date of 342 ± 22 BP, which corresponds to a calibrated age of 430 ± 20 yr. We estimate that the oldest part of the baobab has an age of 475 ± 50 yr. The investigation of the baobab of Golconda Fort revealed that it consists of 6 + 2 fused stems. Six stems build two rings that close two distinct false cavities, while two additional stems are located outside the rings. We called this new type of architecture double closed ring-shaped structure with two separate false cavities.
Radiocarbon dating of Makuri Le boom, a very old African baobab from Nyae Nyae, Namibia

(Department of Chemistry, 2020) Patrut, Roxana T. ; Patrut, Adrian ; Rakosy, Demetra ; Rakosy, Laszlo ; Lowy, Daniel A. ; Bodis, Jeno ; von Reden, Karl F.

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.
Radiocarbon investigation of the big baobab of Outapi, Namibia

(Studia Chemia, 2021-03-31) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Rakosy, Demetra ; Ratiu, Ileana-Andreea ; von Reden, Karl F.

The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of the Big baobab of Outapi, which is the largest African baobab of Outapi, Namibia. The investigation of this monumental baobab revealed that it consists of 8 fused stems, out of which 4 are false stems. The Big baobab exhibits a closed ring-shaped structure. Three stems build the ring, which is now incomplete due to previous damage to the false cavity. Three wood samples were collected from the false cavity and from the longest false stem. Seven segments were extracted from the samples and dated by radiocarbon. The oldest investigated sample segment had a radiocarbon date of 820 ± 17 BP, corresponding to a calibrated age of 780 ± 10 calendar years. According to dating results, the Big baobab of Outapi is 850 ± 50 years old.
Radiocarbon investigation of two old elms from Romania

(Studia Chemia, 2022-03) Patrut, Adrian ; Patrut, Roxana T. ; Bocos-Bintintan, Victor ; Ratiu, Ileana-Andreea ; Rakosy, Laszlo ; Zdrob, George ; Vanca, Eufrosina ; von Reden, Karl F.

The paper reports the AMS (accelerator mass spectrometry) radiocarbon investigation results of two superlative elms from Romana, the very large field elm of Calafat, with a wood volume of 85 m 3 , and the wych elm of Sadova. Two wood samples were extracted from each elm and were analysed by AMS radiocarbon. The oldest dated sample from the elm of Calafat had a radiocarbon date of 350 ± 19 BP, which corresponds to a calibrated age of 415 ± 25 years, while the oldest sample from the elm of Sadova had a radiocarbon date of 188 ± 24 BP, corresponding to a calibrated age of 260 ± 25 years. These values indicate high ages for the two elms, namely 430 ± 25 years or the elm of Calafat and 400 ± 25 years for the elm of Sadova.
Radiocarbon investigation of the Superlative African Baobabs from Savé Valley Conservancy, Zimbabwe

(Universitatis Babes-Bolyai, Department of Chemistry, 2019) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Lowy, Daniel A. ; Margineanu, Dragos ; von Reden, Karl F.

The article reports the radiocarbon investigation results of the superlative African baobabs from Savé Valley, Zimbabwe. Several wood samples collected from these baobab were analysed by AMS (accelerator mass spectrometry) radiocarbon dating. The radiocarbon dates of the oldest samples were 1529 ± 14 BP for Matendere Big baobab, 1179 ± 19 BP for Chishakwe Big tree and 1096 ± 35 BP for Mokore Giant baobab. The corresponding calibrated ages are 1430 ± 15, 1090 ± 40 and 1020 ± 25 calendar yr. The oldest tree from Savé Valley, which we described previously, is the Humani Bedford Old baobab. The radiocarbon date of its oldest sample, 1655 ± 14 BP, corresponds to a calibrated age of 1580 ± 30 calendar yr.
Radiocarbon investigation of two large african baobabs from Kizimkazi, Zanzibar, Tanzania

(Studia Chemia, 2022-06) Adrian, Patrut ; Roxana T., Patrut ; Laszlo, Rakosy ; Ileana-Andreea, Ratiu ; Jenö, Bodis ; Nassor Mahmoud, Nassor ; Karl F., Von Reden

The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of Kizimkazi Big tree and Kizimkazi II baobab, two large African baobabs from Zanzibar, Tanzania. Unfortunately, both baobabs toppled and died in 2018 and 2020, during violent storms. The investigation of the two baobabs evinced that the first of them, which was also the biggest tree of Tanzania, consisted of 5 stems, out of which 2 were false ones, and had a closed ring-shaped structure. The second baobab was composed of 4 fused stems and had a cluster structure. Several wood samples were collected from the two baobabs. Seven segments were extracted from the samples and dated by radiocarbon. The oldest segment from Kizimkazi Big tree had a radiocarbon date of 312 ± 18 BP, corresponding to a calibrated age of 380 ± 10 calendar years. According to dating results, the Kizimkazi Big tree died at the age of 400 ± 25 years. The oldest segment from Kizimkazi II baobab had a radiocarbon date of 137 ± 17 BP, corresponding to a calibrated age of 190 ± 10 calendar years. This value indicates that the Kizimkazi II baobab was 250 ± 25 years old when it died.
Radiocarbon dating of a very old African baobab from Savé Valley, Zimbabwe

(Studia Chemia, 2016) Patrut, Adrian ; Rakosy, Laszlo ; Patrut, Roxana T. ; Ratiu, Ileana ; Forizs, Edit ; Lowy, Daniel A. ; Margineanu, Dragos ; von Reden, Karl F.

The article reports the radiocarbon investigation results of the Humani Bedford baobab, an old African baobab from Savé Valley, Zimbabwe. Two wood samples were collected from the large inner cavity. Several segments were extracted from these samples and analysed by AMS (accelerator mass spectrometry) radiocarbon dating. We found that the age values of segments increase with the distance into the wood. This major anomaly is characteristic to multi-stemmed baobabs with a closed ring-shaped structure and a false cavity inside. The investigation of the Humani Bedford baobab evinced that the baobab consists of three fused stems. The fourth stem of the ring is missing. The oldest dated segment was found to have a radiocarbon date of 1655 ± 14 BP, which corresponds to a calibrated age of 1575 ± 30 yr. The dating results show that the stems which build the ring stopped growing toward the false cavity more than 600 yr ago. By considering the position of the oldest segment in the investigated stem, we concluded that the Humani Bedford baobab is around 1800 yr old. According to our dating results, the Humani Bedford baobab becomes the oldest living African baobab.
Radiocarbon investigation of a superlative Grandidier Baobab, the Big Reniala of Isosa

(Universitatis Babes-Bolyai, Department of Chemistry, 2019) Patrut, Roxana T. ; Patrut, Adrian ; Pock-Tsy, Jean-Michel Leong ; Woodborne, Stephan ; Rakosy, Laszlo ; Danthu, Pascal ; Ratiu, Ileana-Andreea ; Bodis, Jeno ; von Reden, Karl F.

The article discloses the accelerator mass spectrometry (AMS) radiocarbon dating results of the Big Reniala of Isosa, which is a massive Grandidier baobab (Adansonia grandidieri Baill.) of Madagascar. The investigation of this baobab shows that it consists of 5 perfectly fused stems and exhibits a cluster structure. The calculated wood volume of the tree is 540 m3, which makes the Big Reniala of Isosa the largest individual of all Adansonia species and also the biggest known angiosperm in terms of volume. Several samples were collected from the outer part of the stems. The oldest dated sample had a radiocarbon date of 934 ± 24 BP, which corresponds to a calibrated age of 845 ± 25 years. This value indicates an age of 1000 ± 100 years for the big Reniala of Isosa.
Final radiocarbon investigation of Platland tree, the biggest African baobab

(Studia Chemia, 2017) Patrut, Adrian ; Woodborne, Stephan ; Patrut, Roxana T. ; Rakosy, Laszlo ; Hall, Grant ; Ratiu, Ileana ; von Reden, Karl F.

The article discloses the main results of our new investigation of Platland tree, a.k.a. Sunland baobab, the largest known African baobab. Our recent research was motivated by the three successive splits of 2016 and 2017, which determined the collapse and demise of the stems that have built the main unit of the tree. According to our new findings concerning the architecture of large and old baobabs, we established that Platland tree has a double closed-ring shaped structure and consists of two units/rings that close two separate false cavities. The larger unit was composed of five fused stems, out of which four toppled and died, while the fifth stem is already broken. The smaller unit, which is still standing, consists of three fused stems. We also determined that the larger unit had an age of 800 yr, while the smaller unit is 1100 yr old.
Age, growth and death of a national icon: the historic Chapman baobab of Botswana

(MDPI, 2019-11-05) Patrut, Adrian ; Woodborne, Stephan ; Patrut, Roxana T. ; Hall, Grant ; Rakosy, Laszlo ; Winterbach, Christiaan ; von Reden, Karl F.

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.
Radiocarbon dating of the historic Livingstone Tree at Chiramba, Mozambique

(Studia Universitatis Babes-Bolyai, 2020) Patrut, Adrian ; Patrut, Roxana T. ; Slater, Michael J. ; Rakosy, Laszlo ; Lowy, Daniel A. ; von Reden, Karl F.

The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of the Livingstone Tree, a large African baobab on the right bank of the Zambezi, near Chiramba, Mozambique. In 1858, David Livingstone, who discovered the baobab, carved his monogram on the walls of its inner cavity. In 1996, the historic baobab was uprooted when a cyclone struck the area. Several wood fragments were extracted from the remains of the toppled tree. Five samples which originate from these fragments were subsequently dated by radiocarbon. The oldest sample had a radiocarbon date of 1598 ± 17 BP, that corresponded in 1996 to a calibrated age of 1490 ± 35 calendar years. According to this value, the Livingstone Tree at Chiramba becomes one of the oldest known African baobabs, with an age of over 1500 years. The Livingstone Tree had a closed ring-shaped structure, that consisted of 4 fused stems around a false cavity and also 2 additional stems outside the ring.
Radiocarbon dating of the old ash of Aiton, Romania

(Studia Universitatis Babes-Bolyai, 2018) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Ratiu, Ileana ; Lowy, Daniel A. ; Bodis, Jeno ; von Reden, Karl F.

The article reports the AMS (accelerator mass spectrometry) radiocarbon investigation results of the old common ash of Aiton. Five wood samples were collected from the trunk of the tree. The deepest ends of the samples were analysed by AMS radiocarbon. We found radiocarbon dates between 165 ± 20 BP and 240 ± 18 BP, which correspond to calibrated ages of 230 – 360 years. These results, combined with a ring counting estimate, indicate an age of 330 ± 30 years for the ash of Aiton. By this value, the ash of Aiton becomes the oldest known common ash with accurate dating results.
Radiocarbon Investigation of the Historic African Baobabs of Omusati, Namibia

(MDPI, 2022-11-11) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Rakosy, Demetra ; Oliver, Willie ; Ratiu, Ileana A. ; Lowy, Daniel A. ; Shiimbi, Gebhardt ; Woodborne, Stephan ; von Reden, Karl F.

The Omusati region belongs to historic Ovamboland, an area of northern Namibia populated by tribes of the Ovambo group. Four very large African baobabs of Omusati played an important role in historic events of the area, such as the tribal wars and the Namibian War of Independence. The four historic baobabs are the Ombalantu baobab (8 stems; circumference 24.50 m), Okahao baobab (4+ stems; around 25 m), Amadhila baobab (12 stems; 25.35 m) and Sir Howard baobab (9 stems; 31.60 m). Two historic baobabs collapsed totally or partially. The stems of the Amadhila baobab toppled and died in 2021, while 3 stems of the Okahao baobab collapsed a long time ago, but are still alive. Our research aimed to determine the architecture and age of these baobabs. Three baobabs (Ombalantu, Amadhila, Sir Howard) exhibit a closed ring-shaped structure, with a false cavity inside. One baobab (Okahao) had an open ring-shaped structure, before its collapse. Several wood cores were extracted from the baobabs and investigated by radiocarbon dating. The dating results indicate ages of 770 ± 50 years for the Ombalantu baobab, 650 ± 50 years for the Okahao baobab, 1100 ± 50 years for the Amadhila baobab and 750 ± 50 years for the Sir Howard baobab.
Radiocarbon dating of the historic Emperor's beech from Muncel, Baia de Aries, Romania

(Studia Chemia, 2022-12-30) Patrut, Adrian ; Bocos-Bintintan, Victor ; Patrut, Roxana T. ; Partila, Doriana ; Ratiu, Ileana-Andreea ; Rakosy, Laszlo ; Von Reden, Karl F.

The article reports the AMS (accelerator mass spectrometry) radiocarbon dating results of the historic Emperor’s Beech (Fagul Împăra- tului) from Muncel, Baia de Arieş, Romania. Two wood samples were collected from the large tree, out of which four segments were extracted and analysed by AMS radiocarbon. The oldest dated sample segment had a radiocarbon date of 233 ± 18 BP, which corresponds to a calibrated age of 365 ± 5 years. This value suggests an age of 420 ± 20 years for the Emperor’s Beech. Thus, the historic beech started growing around the year 1600.
Radiocarbon dating of the historic grand baobab of Mahajanga, Madagascar

(Studia Chemia, 2023-01-09) Patrut, Adrian ; Patrut, Roxana T. ; Rakosy, Laszlo ; Ratiu, Ileana Andreea ; Danthu, Pascal ; Leong Pock Tsy, Jean-Michel ; Von Reden, Karl F.

The article reports the AMS (accelerator mass spectrometry) radiocarbon investigation of the historic Grand Baobab of Mahajanga. The largest African baobab of Madagascar exhibits a cluster structure, which consists of 6 fused ordinary stems and of 3 small binding stems. Two samples were collected from the largest stem and from a primary branch, out of which several tiny segments were extracted and dated by radiocarbon. The oldest dated sample segment had a radiocarbon date of 214 [+ or -] 17 BP, which corresponds to a calibrated age of 265 [+ or -] 25 calendar years. The dating results indicate that the Grand Baobab of Mahajanga is 275 [+ or -] 25 years old. Keywords: AMS radiocarbon dating, Adansonia digitata, dendrochronology, Madagascar, age determination, multiple stems.
AMS radiocarbon dating of large za baobabs (Adansonia za) of Madagascar

(Public Library of Science, 2016-01-13) Patrut, Adrian ; Patrut, Roxana T. ; Danthu, Pascal ; Pock-Tsy, Jean-Michel Leong ; Rakosy, Laszlo ; Lowy, Daniel A. ; von Reden, Karl F.

The article reports the radiocarbon investigation of Anzapalivoro, the largest za baobab (Adansonia za) specimen of Madagascar and of another za, namely the Big cistern baobab. Several wood samples collected from the large inner cavity and from the outer part/exterior of the tree were investigated by AMS (accelerator mass spectrometry) radiocarbon dating. For samples collected from the cavity walls, the age values increase with the distance into the wood up to a point of maximum age, after which the values decrease toward the outer part. This anomaly of age sequences indicates that the inner cavity of Anzapalivoro is a false cavity, practically an empty space between several fused stems disposed in a ring-shaped structure. The radiocarbon date of the oldest sample was 780 ± 30 bp, which corresponds to a calibrated age of around 735 yr. Dating results indicate that Anzapalivoro has a closed ring-shaped structure, which consists of 5 fused stems that close a false cavity. The oldest part of the biggest za baobab has a calculated age of 900 years. We also disclose results of the investigation of a second za baobab, the Big cistern baobab, which was hollowed out for water storage. This specimen, which consists of 4 fused stems, was found to be around 260 years old.

Rakosy Laszlo

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