bluuebunny/crossref_metadata_2025 huggingface dataset:
THE EFFECTIVENES OF ROLE PLAY IN IMPROVINGENGLISH SPEAKING SKILLTO THE TENTH GRADE STUDENTS OF MA NIDA’UL KHAIRAAT POMBEWE
Authors: Seli Seli , Amelia Yuni
Published: August 2021

This study aims to determine the process of improving speaking skill through role play for tenth grade students of MANida'ul Khairaat Pombewe in the academic year 2020/2021. This study used pre-experimental design research methods. The researcher chose class 10thas a sample consisting of 10 students. In collecting the data, researchers used four types of instruments, namely: pre-test, treatment, post-test and documentation. The result of the data calculation showed that mean score of the students’ pre-test was 40.9, it was lower than the mean score of post-test 52.6. In analyzing the data the researchers used the 0.05 and 0.01 degree of significance and df (degree of freedom) N-1. This study has two hypothesis which are the null hypothesis or Ho (there is no improvement of using role play to the students’ speaking skill, and the alternative hypothesis or Ha (there is improvement of using role play to the students’ speaking skill). It can be concluded that Ho was rejected and Ha was accepted. The use of role play was effective to improve the students speaking skill at the tenth grade of students in MA Nida’ul Khairaat Pombewe.
New relational understandings of city building
Authors: Tasan-Kok Tuna
Published: August 2021

In this think piece I will take you on a journey to share my approach to reading contemporary city building, which is increasingly chaotic, fragmented, and complex. Spatial governance, in my understanding, refers to the collective efforts to coordinate and structure the dynamic institutional activities of a variety of actors that aim to organise the built environment. Urban planning is one of these efforts, though not the only one. Therefore, in this article, I will visualise spatial governance as a dynamic landscape which accommodates multi-actor, multi-scalar, multi-loci and multi-temporal regulatory activities related to the uncertainties, opportunities, and crises of the market. Reading dynamic landscapes of spatial governance requires an understanding of regulatory efforts as they refer to the relational behaviour of state, market, and community actors. This approach, to linking regulatory efforts to relational behaviour, in my view, gives us new opportunities to provide comprehensive understandings of how cities develop under market-driven conditions.
The impact of actor-relational dynamics on integrated planning practice
Authors: Eräranta Susa , Mladenović Miloš N.
Published: August 2021

Integrated planning processes involve an increasing number of actors and aim to create synergy between multiple knowledges in communicative settings. Planning research has acknowledged that the actor-relational aspects of planning processes are not yet adequately understood, and that methods to reveal the often-invisible dynamics and their possible effects over time require development. This research aims at developing a methodological contribution for revealing the socio-communicative complexities of integrated planning processes, by focusing on the aspects of knowledge co-creation and process memory development. Actor-relational dynamics are explored through social network analysis and qualitative methods, using longitudinal data from a four-year strategic spatial planning process in the Finnish context. The findings indicate that a range of actor-relational dynamics affect the level of sectoral and scalar integration over time, and that social complexities have an essential role in enabling knowledge co-creation and process memory development. Unveiling actor-relational dynamics is a promising research direction, requiring new methods for bridging research and practice, and re-centring the need for understanding planning practice on the actor-relational level.
City-county consolidation and the (re)conceptualisation of urban-rural planning
Authors: Huang Wei-Ju
Published: August 2021

The Taiwanese central government views city-county consolidations as an effective method to strengthen national competitiveness and to balance regional development. But for local governments, consolidation presents a series of planning challenges, especially in relation to the reconstruction of planning concepts and discourses in their new territories. Aiming to understand the process, this study first proposes a typology of regional planning concepts as a conceptual tool to explore whether and how the consolidated governments (re)construct their urban-rural planning concepts, and then it examines the factors that may influence (re)conceptualisation through a comparative study of Taichung City and Tainan City. The research results show that overemphasis on using the concept of competitive city regionalism to balance regional development at the national level may lead to a widening of rural-urban disparities at regional and local levels.
Imagining the City of Tomorrow Through Foresight and Innovative Design
Authors: Lavoie Nicolas , Abrassart Christophe , Scherrer Franck
Published: August 2021

Ecological and digital transitions alongside concerns over social inequalities have signalled the advent of complex new challenges for contemporary cities. These challenges raise issues pertaining to the dynamic capability of urban planners: more specifically, their ability to revise their tools and planning routines in urban projects. New paradigms of collective action for the transition towards innovative cities have been developed in large organisations. European companies, especially in public transportation, have developed such tools based on innovative design theories. One of these methodological tools, the Definition-Knowledge-Concept-Proposition (DKCP) process, was used to generate a new range of planning options for an urban district in Montreal, Canada. For many municipal organisations, the formulation of innovative ideas only concerns one stage of the process, represented by the ‘P’ phase. However, innovative routines should rather include the earlier phases of identifying the scope of possible innovations, the search for intriguing knowledge and disruptive design activities. The desire to tackle the complex challenges of 21st century cities has led to a new professional identity: the ‘innovative urban planner’.
Emerging Places of Social Innovation (POSI):
Authors: Ardill Nicholas
Published: August 2021

Social innovation is recurrently positioned as an important collaborative element in helping cities to transition and address human needs and societal challenges to enhance the health, wellbeing, and welfare of citizens. To address a call for more sector-specific research on the spatiality of social innovation, and also further understanding of the process dimension of social innovation, this article presents a conceptual framework of the process of social innovation. By combining social innovation insight from process theories and urban spaces discourse the article indicates that of social innovation in the co-production of space can be grouped into four major processes: 1) Identification of human needs or societal challenges to sustainable development; 2) Development of social relations in systems or structures; 3) Provision of opportunity for social empowerment; 4) Reflection of socio-spatial development practice. Applying this framework, the article examines how productive green infrastructure emerges in the urban landscape as a Place of Social Innovation (POSI).
The circular economy in urban projects
Authors: Appendino Federica , Roux Charlotte , Saadé Myriam , Peuportier Bruno
Published: August 2021

Over the last decade, the concept of the circular economy (CE) has gained momentum among practitioners, politicians, and scholars because of its promise of achieving sustainability goals. However, there is still a need to demonstrate and assess the positive environmental impacts of the CE. With respect to the building sector, the CE is still a relatively new topic. To date, research has tended to focus primarily on the macro-scale (cities or eco-parks) and the micro-scale (manufactured products or construction materials). Nevertheless, the often-neglected built environment is also expected to play a crucial role in the transition towards a CE due to its high contribution to various environmental burdens. This paper contributes to this growing area of research by reviewing four cases of ‘circular neighbourhood’ projects in Europe. First, a conceptual framework analysis is defined and applied to the cases. Second, CE initiatives and actions are identified and classified using interviews and document analysis. Third, the use of assessment tools within these CE projects is investigated. The results demonstrate a diverse representation of the CE paradigm and the growing role played by the assessment tools.
About the history of conflicts over urban forestry in Estonian towns
Authors: Sander Heldur , Meikar Toivo
Published: August 2021

The article explores conflicts related to forests and parks of Estonian towns from the Middle Ages to the 1940s. A brief overview is first given of the development of urban forestry in Estonia. There are also cases where the loss of urban forests and the related problems that arose could have led to conflicts, but for certain reasons they did not emerge. The main focus of the research is on Tallinn and its nearby island of Naissaare and, to a lesser extent, on the town of Haapsalu. The cases with the probability of conflict are described on the example of Tallinn, Tartu and Pärnu. It is apparent that conflicts or preconditions for their emergence were caused by various reasons, both at the state and town level where local authorities and ownership relations played their role. But the causes of the conflicts can also be traced to the wider clash between military and political causes, economic development and the general public.
Common ash (Fraxinus excelsior L.) in Ukrainian forests and its successful natural regeneration
Authors: Tkach Viktor , Rumiantsev Maksym , Luk’yanets Volodymyr , Kobets Oleksii , Pozniakova Svitlana , Obolonyk Iryna , Sydorenko Serhii
Published: August 2021

The natural distribution area of common ash (Fraxinus excelsior L.) in the forests of Europe and Ukraine has been determined through the analysis of scientific works of Ukrainian and foreign researchers. According to the reference materials on the current state of Ukrainian forests (25 administrative regions), it is established that ash forests cover an area of about 150,000 ha or 2.4% of the total area of the country’s forests. Among them, common ash stands account for almost 87% or 130,000 ha; the rest are stands of introduced ash species, namely F. pennsylvanica Marsh., F. americana L., and F. lanceolata Borkh. The average age of ash stands is 59 years. Only 6.4% (8,300 ha) of the total area of ash forests is covered by pure ash stands, and the remaining area (93.6% or 121,700 ha) are mixed ones. It is revealed that the optimal natural and climatic conditions for the emergence, preservation and successful growth of natural regeneration of ash trees are fresh and moist fertile sites (rich in minerals) with well-drained soils, the light of at least 5–6% of that on an open space, and without abundant live ground cover. The highest number of seed regeneration of ash, about 7,000–8,000 stems ha−1 on average, was found under the canopy of mixed (ash share in the composition was 10 to 20% by stock) old (over 100 years old) stands with a relative density of stocking of 0.7–0.8. Promoting the natural seed regeneration of ash trees can be an effective way of increasing the sustainability of such stands and will ensure their preservation in the forests of Ukraine and in deciduous forests of Europe as a whole.
Decline of Fraxinus excelsior L. in parks of Saint Petersburg: Who is to blame – Hymenoscyphus fraxineus or Diplodia spp.?
Authors: Shabunin Dmitrii A. , Selikhovkin Andrey V. , Varentsova Elena Yu. , Musolin Dmitry L.
Published: August 2021

The weakening and decline of European ash Fraxinus excelsior L. and other ash species have been recorded at different locations in the suburbs of Saint Petersburg, Russia. During the summer of 2019 and spring of 2020, samples from leaves, petioles, and shoots were collected from the weakened and declining ash trees in three parks in Pushkin and Gatchina and maintained in humid chambers to induce the fructification of fungi. In total, 30 taxa of micromycetes belonging to 23 genera were identified using methods of light microscopy. Hymenoscyphus fraxineus, a putative agent of ash dieback, was not recorded in the samples collected in the crowns of trees, but only on the petioles of the fallen leaves in spring. Out of all the micromycetes recorded, only coelomycetes from the genus Diplodia Fr. (in particular, D. mutila) can damage the branches of ash trees and, thus, be considered pathogenic. It is likely that H. fraxineus opens “the entry of infection” and Diplodia spp. cause the major weakening and decline of branches. The data obtained can significantly change our understanding of the causes of ash dieback and possible methods of ash stand preservation. The reason for the low pathogenicity and activity of H. fraxineus, as well as the possible role of ascomycetes Diplodia spp. in the dieback of ash stands requires further research.
Forest cover dynamics of the Bazoy Siberian pine (Pinus sibirica Du Tour) forest from 1915 to 2015
Authors: Debkov Nikita , Sidorenkov Victor , Sidorenkova Elena , Sedykh Vladimir
Published: August 2021

The article considers the long-term (100 years) dynamics of the forest cover of the southernmost unit of Siberian pine forests on the West Siberian plain. A key feature of forest management is that Siberian pine seeds are a valuable food product and, when cutting forests, this tree species, as a rule, is preserved. The basis of the experimental data was the material of the national forest inventories of 1915, 1974 and 2015 for a total area of 1,420.41 ha. During the period from 1915 to 2015, the forested area changed slightly (96.2 and 94.0%), while the share of Siberian pine stands increased significantly from 48.4 to 58.7%. Grassy Siberian pine forests (32.1%) of optimal age (120–140 years), which are characterised by the best seed productivity and the largest share of Siberian pine in the community (77%), predominate. Basically, human economic activity results in an increase in the area of Siberian pine stands, when deciduous stands with Siberian pine undergrowth are used for fuel and as building material. A decrease in the area of Siberian pine forests occurs mainly under the impact of fires. In the conflagrations of 1915–1920, 7 to 38% of silver birch forests have no Siberian pine undergrowth and are considered long-term secondary communities. In the remaining area, the proportion of Siberian pine undergrowth is 20–30% with a density of 800–1200 seedlings ha−1, which is sufficient for the natural formation of Siberian pine forests.
Potential of ecological modelling and smart-drainage development for mitigating adverse effects of future global change-type droughts for the Estonian forest sector
Authors: George Jan-Peter , Lang Mait , Hordo Maris , Metslaid Sandra , Post Piia , Tamm Toomas
Published: August 2021

Global change-type droughts will become more frequent in the future and threaten forest ecosystems around the globe. A large proportion of the Estonian forest sector is currently subject to artificial drainage, which could probably lead to negative feedbacks when water supply falls short because of high temperatures and low precipitation during future drought periods. In this short article, we propose a novel research perspective that could make use of already gathered data resources, such as remote sensing, climate data, tree-ring research, soil information and hydrological modelling. We conclude that, when applied in concert, such an assembled dataset has the potential to contribute to mitigation of negative climate change consequences for the Estonian forest sector. In particular, smart-drainage systems are currently a rare phenomenon in forestry, although their implementation into existing drainage systems could help maintain the critical soil water content during periods of drought, while properly fulfilling their main task of removing excess water during wet phases. We discuss this new research perspective in light of the current frame conditions of the Estonian forest sector and resolve some current lacks in knowledge and data resources which could help improve the concept in the future.
An indirect approach to predict deadwood biomass in forests of Ukrainian Polissya using Landsat images and terrestrial data
Authors: Matsala Maksym , Myroniuk Viktor , Bilous Andrii , Terentiev Andrii , Diachuk Petro , Zadorozhniuk Roman
Published: August 2021

Spatially explicit and consistent mapping of forest biomass is one of the key tasks towards full and appropriate accounting of carbon budgets and productivity potentials at different scales. Landsat imagery coupled with terrestrial-based data and processed using modern machine learning techniques is a suitable data source for mapping of forest components such as deadwood. Using relationships between deadwood biomass and growing stock volume, here we indirectly map this ecosystem compartment within the study area in northern Ukraine. Several machine learning techniques were applied: Random Forest (RF) for the land cover and tree species classification task, k-Nearest Neighbours (k-NN) and Gradient Boosting Machines (GBM) for the deadwood imputation purpose. Land cover (81.9%) and tree species classification (78.9%) were performed with a relatively high level of overall accuracy. Outputs of deadwood biomass mapping using k-NN and GBM matched quite well (8.4 ± 2.3 t·ha−1 (17% of the mean) vs. 8.1 ± 1.7 t·ha−1 (16% of the mean), respectively mean ± SD deadwood biomass stock), indicating a strong potential of ensemble boosters to predict forest biomass in a spatially explicit manner. The main challenges met in the study were related to the limitations of available ground-based data, thus showing the need for national statistical inventory implications in Ukraine.
Options for estimating horizontal visibility in hemiboreal forests using sparse airborne laser scanning data and forest inventory data
Authors: Lang Mait , Vennik Kersti , Põldma Andrus , Nilson Tiit
Published: August 2021

Horizontal visibility v in hemiboreal forest transects was measured in the field and then predicted, both from forest inventory (FI) data and from airborne laser scanning (ALS) data. Stand density N and mean diameter at breast height D were used as arguments in an FI predictive model assuming Poisson distribution of trees on a horizontal plane. It was found that a lack of FI data on forest regrowth and understorey trees caused v to be overestimated. Point cloud metrics of sparse ALS data from summer 2017 and spring 2019 were used as predictive variables for v in regression models. The best models were based on three variables: the 10th percentile of the point cloud height distribution, relative density of returns in a horizontal layer ranging 0.7–2.2 m above the ground, and canopy cover. The models had a coefficient of determination of up to 67% and a residual standard error of less than 25 m. In forests in which fertile soil produces rapid height growth of understorey woody vegetation after recent thinning, visibility was found to be substantially overestimated because the understorey was not detected by the lidar measurements.
Harvendusraietel toimunud metsaõigusnormide rikkumise juhtumite hindamine
Authors: Korjus Henn , Mets Mihkel , Kangur Ahto
Published: August 2021

Three cases of violation of forest management regulations in Estonia in 2004, 2005 and 2007 are presented in the study where the required lower limit of basal area after thinnings was not followed. These stands were revisited in 2017 to assess the impacts of such thinnings. The actual thinnings were well justified from the silvicultural and economic viewpoints. All three stands were ecologically in good condition in 2017. Also, all three stands had already reached the required age or dimensions allowing regeneration cutting in 2017. Forest management regulations on thinning did not work well in the studied cases and therefore some changes in the current regulations are necessary in Estonia.
Preparation and Characterization of In2O3-CuO Nanocomposite Thin Films as NH3 Gas Sensor
Authors: Hameed Abd alhameed A. , AL-Jumaili Hamid S.
Published: August 2021

An NH3 gas sensor was prepared from nanocomposite films of indium oxide-copper oxide mixtures with ratios of 0 , 10 , and 20 Vol % of copper oxide. The films were deposited on a glass substrate using chemical spray pyrolysis method (CSP) at 400oC. The structural properties were studied by using X-ray diffraction (XRD) and atomic force microscopy ( AFM). The structural results showed that the prepared thin films are polycrystalline, with nano grain size. By mixing copper oxide with indium oxide, the grain size of the prepared thin films was decreased and the surface roughness was increased. The UV-Visible spectrometer analysis showed that the prepared thin films have high transmittance. This transmittance was decreased by mixing copper oxide with indium oxide. The direct optical energy gap ranged 3.5 - 3 eV, which was decreased with increasing copper oxide concentration. The sensitivity of the prepared gas sensor was measured towards NH3 gas at a concentration of 71ppm with operating temperatures of 100, 150, 200, 250 and 30) oC, according to the change of sensor resistance. This sensitivity of the mixture oxides showed a value of about nine times greater than that of individual indium oxide thin films. The results of the optimum gas sensor properties demonstrated a sensitivity value of 75.06%, response time of 10s, and recovery time of 11 s, at a mixing ratio of 20% of copper oxide and an operating temperature of 200oC.
Impact of Laser Energy on Features of Carbon Nanostructure Materials Prepared by A One-Step Pulsed Laser Ablation in Water
Authors: Addie Ali , Khashaan Khawla Salah , Saimon Jehan , Hassan Azhar
Published: August 2021

Carbon nanoparticles (CNPs) formed by one-step laser ablation in deionized water were carefully studied. Scanning electron microscopy, atomic force microscopy, Raman spectroscopy, and UV–V spectroscopy were used to obtain morphological, chemical, and optical properties of CNPs. SEM outcomes established that the synthesized nanoparticles are semi-spherical with a wide particle size distribution. Raman investigation showed two typical and expected peaks ~ (1300 - 2700) cm−1, which are confirming to transverse and longitudinal modes of the carbon structure. The absorption spectra proved that the intensity of spectra increases as particle size and concentration increase.
Density, diversity and community composition of trees in tropical thorn forest, peninsular India
Authors: Evitex-Izayas J. , Udayakumar M.
Published: August 2021

Tropical thorn forests (TTFs) are characterized by the presence of small and thorny trees which usually shed their leaves in dry season. A quantitative phytosociological study was conducted in Uthumalai Reserve Forest of Peninsular India to record density, species richness, diversity and population structure of trees. Diameter of all free standing trees ≥1 cm diameter at breast height (DBH, cm) was measured at 1.37 m above the ground. A sum of 4135 trees ≥1cm DBH recorded from one hectare study plot. With 2272 (54.94%) individuals Dalbergia spinosa dominated the study plot followed by Commiphora berryi (484, 11.70%), Grewia flavescens (259, 6.26%), Dichrostachys cinerea (206, 4.98%) and Anogeissus pendula (171, 4.14%). In total, 26 species belonged to 19 genera and 15 families found in one ha study plot. The family Mimosaceae had a large number of species followed by Apocynaceae, Capparidaceae, Tiliaceae, Rhamnaceae. Rubiaceae (each 2 species). Stand basal area of tree community recorded as 15.238 m2 ha-1. Commiphora berryi constituted 50.80% (7.74 m2 ha-1) of stand basal area followed by Dalbergia spinosa (19.43%, 2.96 m2 ha-1). The forest showed a reverse J shaped population structure. Shannon diversity (H), equitability (H’) and Simpson’s dominance (D) indices of study area recorded as 1.76, 0.54 and 0.335, respectively. Dalbergia spinosa, Commiphora berryi, Grewia flavescens, Dichrostachys cinerea and Anogeissus pendula topped the species important value index with 87.80, 73.53, 20, 19.79, 17.43 scores, respectively. In family important value index, Papilionaceae topped the list followed by Burseraceae and Mimosaceae with scores 129.32, 74.23 and 34.43, respectively. The study area endowed with a moderate species richness and diversity, and acts as one of the homes for an IUCN’s vulnerable tree species.
The enigmatic continental crust of North-Central Africa: Saharan Metacraton or Central Sahara Shield?
Authors: Shellnutt J.G.
Published: August 2021

The continental crust of North-Central Africa between the Tuareg and Arabian-Nubian shields and south to the Central African Orogenic Belt is enigmatic due to the few bedrock exposures especially within the central region. The current understanding, based on a review of geochronology and isotope geochemistry, is that the central Sahara region is a large, coherent craton that was ‘highly remobilized’ during the Late Neoproterozoic amalgamation of Gondwana and referred to as the Saharan Metacraton. However, new data from the Guéra, Ouaddaï, and Mayo Kebbi massifs and the Lake Fitri inlier of Chad suggest that it may be a composite terrane of older cratonic blocks or microcontinents with intervening Mesoproterozoic to Neoproterozoic domains and referred to as the ‘Central Sahara Shield’. It is postulated that the older crust and juvenile crust were sutured together along a Pan-Gondwana collisional belt (Central Sahara Belt) that bisects the central Sahara region. The ‘Central Sahara Shield’ hypothesis suggests the Chad Lineament, a narrow arcuate gravity anomaly within central Chad, could be a collisional belt suture zone and that it may explain the existence of the relatively juvenile crust that typifies southern and eastern Chad. The new data improves upon the existing knowledge and challenges the lithotectonic paradigm of the Saharan Metacraton. Further investigations are required to fully characterize the crust of the central Sahara region and to test the contrasting hypotheses.
Geochemical reconnaissance of the Guéra and Ouaddaï Massifs in Chad: evolution of Proterozoic crust in the Central Sahara Shield
Authors: de Wit M.J. , Bowring S. , Buchwaldt R. , Dudas F.Ö. , MacPhee D. , Tagne-Kamga G. , Dunn N. , Salet A.M. , Nambatingar D.
Published: August 2021

In 1964, W.Q. Kennedy suggested that the crust of Saharan Africa is different from the rest of Africa. To date, the geologic evolution of this region remains obscure because the age and composition of crystalline basement are unknown across large sectors of the Sahara. Most of Africa comprises Archaean cratons surrounded by Palaeo- to Mesoproterozoic orogenic belts, which together constitute Africa’s three major shields (the Southern, Central and West African Shields), finally assembled along belts of Pan-African rocks. By contrast, central Saharan Africa (5.3x106 km2), an area just over half the size of Europe, is considered either as a Neoproterozoic region constructed of relatively juvenile crust (0.5 to 1.0 Ga), or as an older (North African) shield that was reactivated and re-stabilized during that time, a period commonly referred to as “Pan African”. Here, using U-Pb zircon age determinations and Nd isotopic data, we show that remote areas in Chad, part of the undated Darfur Plateau stretching across ¾ million km2 of the central Sahara, comprise an extensive Neoproterozoic crystalline basement of pre-tectonic gabbro-tonalite-granodiorite and predominantly post-tectonic alkali feldspar granites and syenites that intruded between ca. 550 to 1050 Ma. This basement is flanked along its western margin by a Neoproterozoic continental calc-alkaline magmatic arc coupled to a cryptic suture zone that can be traced for ~2400 km from Tibesti through western Darfur into Cameroon. We refer to this as the Central Saharan Belt. This, in a Gondwana framework, is part of a greater arc structure, which we here term the Great Central Gondwana Arc (GCGA). Inherited zircons and Nd isotopic ratios indicate the Neoproterozoic magmas in the central Sahara were predominantly derived from Mesoproterozoic continental lithosphere. Regional deformation between 613 to 623 Ma marks the onset of late alkaline granite magmatism that was widespread across a much larger area of North Africa until about 550 Ma. During this magmatism, the region was exhumed and eroded, leaving a regional peneplain on which early Palaeozoic (Lower-Middle Cambrian) siliciclastic sediments were subsequently deposited, as part of a thick and widespread cover that stretched across much of North Africa and the Arabian Peninsula. Detrital zircons in these cover sequences provide evidence that a substantial volume of detritus was derived from the central Sahara region, because these sequences include ‘Kibaran-age’ zircons (ca. 1000 Ma) for which a source terrain has hitherto been lacking. We propose that, in preference to calling the central Sahara a “ghost” or “meta” craton, it should be called the Central Sahara Shield.
Location of hemorrhage with nontraumatic acute subdural hematoma due to ruptured microaneurysm
Authors: Yanagawa Taro , Yamashita Keiichi , Harada Yoichi , Hatayama Toru , Kono Takuji
Published: August 2021

Background:

Nontraumatic acute subdural hematoma (ASDH) may be caused by rupture of a microaneurysm of a cortical artery. In some cases, microaneurysms may have been caused by earlier trauma. Although it is difficult to detect microaneurysms on contrast-enhanced computed tomography (CT) angiography or digital subtraction angiography, it may be suspected based on the plain CT scan results and the clinical course.

Case Description:

We experienced three cases presumed to be ASDH due to rupture of a microaneurysm. Plain CT scan showed that the midline shift was smaller than the hematoma thickness, and we judged from the clinical course that there was no trauma immediately before the onset. All three patients had decreased consciousness after arrival and underwent craniotomy for hematoma removal. The source of hemorrhage was in the distal part of the cortical artery, and a microaneurysm was found. In one case, histopathological examination was performed, and traumatic pseudoaneurysm was diagnosed. The postoperative course was good in all three cases.

Conclusion:

If nontraumatic ASDH is suspected, the source of hemorrhage may be located more distally to the middle cerebral artery than in traumatic ASDH; hence, extensive craniotomy is required to search for the location of hemorrhage.
Traumatic brain injury caused by Brazil-nut fruit in the Amazon: A case series
Authors: Ideta Mylena Miki Lopes , Oliveira Louise Makarem , de Castro Gustavo Lopes , Santos Marco Antonio Leal , Simões Erik Leonardo Jennings , Gonçalves Daniel Buzaglo , de Amorim Robson Luis Oliveira
Published: August 2021

Background:

Traumatic brain injury (TBI) represents one of the leading public health problems and a significant cause of neurological damage. Unintentional causes of TBI are the most frequent. However, fruit falling over the head causing TBI is extremely rare. In the Amazon region, accidents with ouriços, a coconut-like shell fruit, seem relatively common. However, to the best our knowledge, it has never been described in a scientific journal before. Therefore, we aim to evaluate a series of TBI caused by this tropical fruit.

Methods:

This study is a retrospective review of 7 TBI cases due to the fall of ouriços admitted to two tertiary hospitals in the Amazon region from January 2017 to December 2018. The collected data included: age, Glasgow Coma Scale, skull fracture, venous sinus injury, hematoma, surgical treatment, and outcome.

Results:

All patients were men, with an average age of 38, ranging from 8 to 77-years-old. Four out of seven had skull fractures. Five patients developed an epidural hematoma, and two of them had an associated subdural hematoma. Dura mater injury was observed in two patients, whereas four patients were operated. There was one related death.

Conclusion:

This case series is the first to describe an unconventional but potentially fatal cause of TBI in the Amazon: the falling of the Brazil-nut fruit. Most patients were diagnosed with mild TBI. Nevertheless, patients may have cranial fractures and epidural hematomas, leading to death when there’s a delay in medical assistance.
Dentate nucleus deep brain stimulation: Technical note of a novel methodology assisted by tractography
Authors: Diniz Juliete Melo , Cury Rubens Gisbert , Iglesio Ricardo Ferrareto , Lepski Guilherme Alves , França Carina Cura , Barbosa Egberto Reis , de Andrade Daniel Ciampi , Teixeira Manoel Jacobsen , Duarte Kleber Paiva
Published: August 2021

Background:

The cerebellum has emerged as an attractive and promising target for neuromodulation in movement disorders due to its vast connection with important cortical and subcortical areas. Here, we describe a novel technique of deep brain stimulation (DBS) of the dentate nucleus (DN) aided by tractography.

Methods:

Since 2015, patients with movement disorders including dystonia, ataxia, and tremor have been treated with DN DBS. The cerebellar target was initially localized using coordinates measured from the fastigial point. The target was adjusted with direct visualization of the DN in the susceptibility-weighted imaging and T2 sequences of the MRI and finally refined based on the reconstruction of the dentatorubrothalamic tract (DRTT).

Results:

Three patients were treated with this technique. The final target was located in the anterior portion of DN in close proximity to the DRTT, with the tip of the lead on the white matter and the remaining contacts on the DN. Clinical outcomes were variable and overall positive, with no major side effect.

Conclusion:

Targeting the DN based on tractography of the DRTT seems to be feasible and safe. Larger studies will be necessary to support our preliminary findings.
Indolent nonendemic central nervous system histoplasmosis presenting as an isolated intramedullary enhancing spinal cord lesion
Authors: Recker Matthew J. , Housley Steven B. , Lipinski Lindsay J
Published: August 2021

Background:

Histoplasma capsulatum infection is largely seen in endemic regions; it results in symptomatic disease in <5% of those infected and is most often a self-limiting respiratory disease. Disseminated histoplasmosis is considered rare in the immunocompetent host. Central nervous system (CNS) dissemination can result in meningitis, encephalitis, and focal lesions in the brain and spinal cord, stroke, and hydrocephalus. An intramedullary spinal cord lesion as the only manifestation of CNS histoplasmosis has been rarely described.

Case Description:

We present an atypical case of a 44-year-old man from a nonendemic region, on adalimumab therapy for ulcerative colitis who developed an isolated intramedullary spinal cord lesion in the setting of disseminated histoplasmosis. His course was initially indolent with vague systemic symptoms that led to consideration of several other diagnoses including sarcoidosis and lymphoma. Biopsies of several positron emission tomography positive lymph nodes revealed granulomatous inflammation, but no firm diagnosis was achieved. He was ultimately diagnosed with histoplasmosis after an acute respiratory infection in the setting of anti-tumor necrosis factor therapy. With appropriate antifungal therapy, the spinal cord lesion regressed. The previous systemic biopsies were re-reviewed, and rare fungal elements consistent with H. capsulatum were identified. A presumptive diagnosis of CNS histoplasmosis was made in the absence of direct laboratory confirmation in the setting of rapid and complete resolution on antifungal therapy.

Conclusion:

Disseminated histoplasmosis should be considered in granulomatous disease, even if the patient resides in a nonendemic region. Furthermore, clinicians should be mindful that CNS histoplasmosis may present in an atypical fashion.
Sporadic supratentorial hemangioblastoma with meningeal affection: A case report and literature review
Authors: Sánchez-Ortega Juan Francisco , Claramonte Marta , Martín Mónica , Calatayud-Pérez Juan
Published: August 2021

Background:

Hemangioblastomas are vascular tumors, of benign behavior, that originate in the central nervous system. Supratentorial hemangioblastomas are extremely rare and are generally associated with Von Hippel-Lindau disease (VHL). The involvement of structures by contiguity, such as blood vessels or meninges, is something exceptional. There are few references in the literature of supratentorial hemangioblastomas with meningeal involvement and most of them are described in reports or small case series.

Methods:

We performed a systematic review of the literature to observe the characteristics of patients with supratentorial hemangioblastomas with meningeal involvement. In addition, we present the case of a 43-year-old male patient with a sporadic supratentorial hemangioblastoma with both, meningeal and vascular involvement that recurred years after treatment.

Results:

The patients presented supratentorial tumors with meningeal involvement, we had a 1.2:1 ratio male-female distribution. The mean age was 50 years. Most tumors were located in the cerebral hemispheres, the lobe affected most frequently was the frontal lobe. About 67% of the cases were sporadic and only 21% were related to VHL disease. There were three cases of recurrence after surgery.

Conclusion:

Supratentorial hemangioblastomas are extremely rare lesions. It is rare for supratentorial hemangioblastomas to invade adjacent structures such as blood vessels or meninges, however, when this happens, it is recommended a preoperative vascular imaging study, especially in parasagittal hemangioblastomas where superior longitudinal sinus may be involved. In these cases,en blocsurgical resection is difficult and the probability of recurrence is higher. Although clinical trials and studies with a greater casuistry are necessary to establish guidelines for the management of supratentorial hemangioblastomas, nowadays, contribution of new cases is useful for understanding this pathology.
Prepontine intracerebral cyst with spontaneous resolution
Authors: Bajwa Mohammad Hamza , Hussain Nasr , Bari Muhammad Ehsan
Published: August 2021

Background:

Intracranial cysts in the prepontine region are rare and can lead to various complications if not managed appropriately. Symptomatic prepontine cysts may require surgical intervention. However, spontaneous resolution of such cysts is rarely reported in literature.

Case Description:

We describe the case of a middle-aged lady who presented with headaches and imbalance, with no focal neurological deficits on examination. Magnetic resonance imaging (MRI) of the brain showed a prepontine cyst compressing the brainstem with craniocaudal extension through the foramen magnum. The patient was given symptomatic treatment and followed closely with repeat MRI scans. These scans showed regression and eventual disappearance of the lesion, with complete resolution of symptoms.

Conclusion:

In light of the few reported cases of spontaneous resolution of prepontine cysts, we highlight the possibility of these lesions to self-resolve.
Bilateral central retinal artery occlusion: An exceptional complication after frontal parasagittal meningioma resection
Authors: Lizana Jafeth , Reinoso Carlos M. Dulanto , Aliaga Nelida , Marani Walter , Montemurro Nicola
Published: August 2021

Background:

Central retinal artery occlusion (CRAO) is a rare acute disease associated with great morbidity. It is reported as a complication of surgical procedures, but rarely associated with brain surgery and no reports before due to parasagittal meningioma resection.

Case Description:

We present the case of a 41-year-old female who underwent surgery for a parasagittal meningioma and developed a bilateral CRAO as an acute postoperative complication. Most common causes, such as cardiac embolism, carotid pathology and coagulation problems, were discussed and all clinical and neuroradiological exams performed were reported.

Conclusion:

Bilateral CRAO as results of brain surgery is extremely rare; however, if it occurs, it should be early recognized and treated to minimize its high morbidity.
Vascularization of the uncus – Anatomical study and clinical implications
Authors: Isolan Gustavo Rassier , Marrone Antônio Carlos Huf , Marrone Luiz Carlos Porcellos , Stefani Marco Antonio , da Costa Jaderson Costa , Telles Joao Paulo Mota , Choi Gil Goulart , da Silva Saul Almeida , Rabelo Nícollas Nunes , Figueiredo Eberval Gadelha
Published: August 2021

Background:

The objective of this paper was to describe the arterial supply of the uncus and quantify the branches directed to the anteromedial aspect of the human temporal cortex.

Methods:

We studied 150 human cerebral hemispheres identifying main afferent arteries supplying the anteromedial temporal cortex with particular attention to the uncus, determining the territory supplied by each artery through either cortical or perforating branches.

Results:

The uncus was supplied by 419 branches of the anterior choroidal artery (AChA), 210 branches of the internal carotid artery (ICA), 353 branches of the middle cerebral artery (MCA), and 122 branches of the posterior cerebral artery (PCA). The total of supplying vessels was 1104 among the 150 hemispheres studied, which corresponds to 7.36 arteries per uncus. The average of branches per hemisphere was as follows: 2.79 from AChA, 1.40 from ICA, 2.35 from MCA, and 0.81 from PCA. The relative contribution of each artery for the total of specimens studied was as follows: 38% from AChA, 19% from ICA, 32% from the MCA, and 11% from the PCA. We identified cortical anastomoses mostly between the MCA and PCA (27 cases).

Conclusion:

We described and quantified the uncus’ vascularization, including anatomical variations. This updated, detailed description of the mesial temporal vascularization is paramount to improve the treatment of neurosurgical conditions.
Gastric balloon: A rare cause of lumbar radiculopathy
Authors: Ferrer Pierre , Álvarez Ana Sofía , Khalil Sara
Published: August 2021

Background:

Factors that are known to cause lumbar epidural venous plexus (EVP) engorgement include inferior vena cava (IVC) obstruction, portal hypertension, vascular agenesis, morbid obesity, and/or hypercoagulable states. Here, we present a 32-year-old female admitted with the new onset of lumbar radiculopathy attributed to a gastric balloon causing compression of the IVC and engorgement of the EVP.

Case Description:

A 32-year-old female was admitted with a left L5 radiculopathy. She had a history of morbid obesity and had undergone intragastric balloon insertion 4 months ago. The abdominal/pelvic CT documented an intragastric balloon producing a voluminous gastric mass with resultant compression of the IVC. The lumbar MRI showed the resultant marked multilevel engorgement of the lumbar EVP. Here, following balloon removal, the patient was immediately symptom free and remained asymptomatic over the next postoperative year.

Conclusion:

An intragastric balloon can produce a voluminous gastric mass that can result in IVC occlusion and engorgement of the EVP, leading to lumbar radiculopathy. Removal of the balloon results in immediate and permanent resolution of the compressive symptoms.
Hematoma subdural crónico: Una patología común de manejo complejo
Authors: Lizana Jafeth , Aliaga Nelida , Basurco Alfonso
Published: August 2021

Antecedentes:

El hematoma subdural crónico (HSDC) es una patología ampliamente estudiada, muy frecuente, sobre todo en adultos mayores; su cuadro clínico tiene una apariencia benigna y suele ir acompañado de múltiples comorbilidades asociadas a la edad, lo que resulta en un aumento de las complicaciones e incluso la muerte. Con el incremento de la expectativa de vida a nivel mundial, el uso de medicamentos antitrombóticos es cada vez más frecuente. El papel de estos fármacos en la evolución de la enfermedad como en la recurrencia, sigue siendo motivo de discusión.

Métodos:

Los autores revisaron la fisiopatología y características clínicas del HSDC. El presente artículo discute acerca de las terapéuticas actuales y las nuevas opciones de tratamiento que podrían mejorar los resultados. Este manuscrito es susceptible de cambios en el tiempo, con el desarrollo científico y tecnológico.

Resultados:

El HSDC puede ser abordado por vía quirúrgica y farmacológica; no obstante, un manejo individualizado requiere la consideracion cuidadosa de diversos factores. A pesar de los avances en el campo de la neurocirugía, la clásica trepanación craneal sigue siendo el Gold estándar en el HSDC y sobre todo en pacientes con síntomas graves. Se debe resaltar que aún hay aspectos de este procedimiento (como la localización del dren, número de drenajes, el efecto de la irrigación, la temperatura de la solución con que se irriga, etc.) que siguen siendo materia de estudio.

Conclusiones:

Entender el mecanismo de la enfermedad ha permitido explicar su historia natural y a su vez proponer nuevas alternativas de tratamiento. El manejo médico (atorvastatina, corticoides) ha generado gran interés por sus alentadores resultados preliminares. Recientemente, se ha reportado la terapia endovascular como una alternativa segura y existe gran expectativa por confirmar su efecto en estudios más grandes.
Overview of indicators of information and digital resources of the Federal Tax Service that characterize the small businesses activities
Authors: Karp M. V. , Zakharova A. V. , Tipalina M. V. , Samodelko L. S.
Published: August 2021

Entrepreneurship is an integral part of the market economy. However, only recently it has been possible to analyse this cluster online. The purpose of the research paper is a qualitative analysis of indicators formed by the Federal Tax Service of Russia to characterize the activities of small and medium-sized businesses. The article presents the results of a review of the indicators of information and digital resources of the Federal Tax Service of Russia that characterize the activities of small businesses: the unified register of small and medium – sized businesses; the unified register of small and medium-sized businesses – recipients of support; the unified state register of taxpayers; the state information register of accounting (financial) reporting; the “Transparent Business” service. It is concluded that the information and statistical databases of the Federal Tax Service of Russia have a significant potential for partial formation of statistical reporting data of small and medium-sized businesses, and are also acceptable for economic and statistical analysis of the activities of both a specific entity and a group of entities.