bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of dihydroquercetin on the toxic properties of nickel nanoparticles
Authors: Gmoshinski Ivan , Ananyan Mikhail , Shipelin Vladimir , Riger Nikolay , Trushina Eleonora , Mustafina Oksana , Guseva Galina , Balakina Anastasya , Kolobanov Alexey , Khotimchenko Sergey , Ozherelkov Dmitriy
Published: April 2023

Dihydroquercetin (3,5,7,3',4'-pentahydroxy-flavanone) is known for its powerful antioxidant, organ-protective, and antiinflammatory activities that can be applied to heavy-metal intoxication. The present research objective was to evaluate the possible protective potential of dietary dihydroquercetin in a rat model of subacute (92 days) intoxication with nickel nanoparticles.

The experiment involved five groups of twelve male Wistar rats in each. Group 1 served as control. Other groups received nickel nanoparticles as part of their diet. Groups 2 and 4 received nickel nanoparticles with an average diameter of 53.7 nm (NiNP1), while groups 3 and 5 were fed with nanoparticles with an average diameter of 70.9 nm (NiNP2). The dose was calculated as 10 mg/kg b.w. Groups 4 and 5 also received 23 mg/kg b.w. of water-soluble stabilized dihydroquercetin with drinking water.

After the dihydroquercetin treatment, the group that consumed 53.7 nm nickel nanoparticles demonstrated lower blood serum glucose, triglycerides, low-density lipoprotein cholesterol, and creatinine. Dihydroquercetin prevented the increase in total protein and albumin fraction associated with nickel nanoparticles intake. The experimental rats also demonstrated lower levels of pro-inflammatory cytokines IL-1β, IL-4, IL-6, and IL-17A, as well as a lower relative spleen weight after the treatment. In the group exposed to 53.7 nm nickel nanoparticles, the dihydroquercetin treatment increased the ratio of cytokines IL-10/IL-17A and decreased the level of circulating FABP2 protein, which is a biomarker of increased intestinal barrier permeability. In the group that received 70.9 nm nickel nanoparticles, the dihydroquercetin treatment inhibited the expression of the fibrogenic Timp3 gene in the liver. In the group that received 53.7 nm nickel nanoparticles, dihydroquercetin partially improved the violated morphology indexes in liver and kidney tissue. However, dihydroquercetin restored neither the content of reduced glutathione in the liver nor the indicators of selenium safety, which were suppressed under the effect of nickel nanoparticles. Moreover, the treatment failed to restore the low locomotor activity in the elevated plus maze test.

Dihydroquercetin treatment showed some signs of detoxication and anti-inflammation in rats subjected to nickel nanoparticles. However, additional preclinical studies are necessary to substantiate its prophylactic potential in cases of exposure to nanoparticles of nickel and other heavy metals.
Cross-Country Coordination of Reindustrialization: Cooperation Potential between Russia and Egypt
Authors: Tishchenko Elena , Slavyantsev Maksim
Published: April 2023

The current global situation involves turbulent financial markets, new geopolitical reality, advanced digital technologies, and multimodal transport corridors. Therefore, to strategize the development of an economic branch and its interaction with foreign markets, one should proceed from new principles of technological connectivity of industries, the importance of resources in the global value chain, the qualityandprice balance, reliable market access opportunities, transport accessibility, cybersecurity, etc. Typification of a natural resource has become especially important in the new conditions. If it is renewable, the long-term goal of its capitalization is to preserve or multiply. If it is non-renewable, the main goal in the formation of national welfare is the maximal output and recultivation. This typification of resources presupposes that a raw material economy has sufficient technological, technical, financial, and political potential to process the resource at the place of its extraction and receive sufficient revenue to either preserve and multiply this resource or to provide the maximal output and reclamation. Access to labor resources and demand market determines the main goal of an economy that depends on the import of natural resources. It involves generating revenue from the production and sale of the final products and services in a place of solvent demand and the additional need to create national welfare based on the existing political, intellectual, and technological resources. Technological sovereignty requires new cooperative cross-country strategies for the interaction of industries and businesses. Technological sovereignty needs a scenario-predictive modeling of the potential of coordination mechanisms to develop mutually beneficial interaction between industries during the high turbulence on foreign markets. The article introduces methodological tools for the development of cooperative cross-country strategies between industries and business. It includes a novel interpretation of the adaptation vectors for national strategies and corporate interests in food security, based on cooperative intersectoral and cross-country development strategies. After the Second Russia-Africa Summit, the article might be useful for the authorities responsible for the technological sovereignty, development, and leadership of Russia.
WITHDRAWN: The Sub-chronic Administration of Echium Oil Attenuates
the Seizure Threshold and Improves Antioxidant Activity in Pentylenetetrazol-
induced Seizure Model of Mice
Authors: Gavzan Hakimeh , Araghi Atefeh , Behzadi Ramazan
Published: April 2023

The article has been withdrawn at the request of the Corresponding author.

Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused.

The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php

Bentham Science Disclaimer:

It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously
submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere
must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submitting
the article for publication the authors agree that the publishers have the legal right to take appropriate action against the
authors, if plagiarism or fabricated information is discovered. By submitting a manuscript, the authors agree that the copyright
of their article is transferred to the publishers if and when the article is accepted for publication.
Recent Progress on Synthesis of Functionalized 1,5-Disubstituted Triazoles
Authors: Jaiswal Manoj K. , Gupta Abhishek , Ansari Faisal J. , Pandey Vinay K. , Tiwari Vinod K.
Published: April 2023

Immediately after the invention of ‘Click Chemistry’ in 2002, the regioselective 1,2,3-triazole scaffolds resulted from respective organic azides and terminal alkynes under Cu(I) cataly-sis have been well recognized as the functional heterocyclic core at the centre of modern organic chemistry, medicinal chemistry, and material sciences. This CuAAC reaction has several notable features including excellent regioselectivity, high-to-excellent yields, easy to execute, short reac-tion time, modular in nature, mild condition, readily available starting materials, etc. Moreover, the resulting regioselective triazoles can serve as amide bond isosteres, a privileged functional group in drug discovery and development. More than hundreds of reviews had been devoted to the ‘Click Chemistry’ in special reference to 1,4-disubstituted triazoles, while only little efforts were made for an opposite regioisomer i.e., 1,5-disubstituted triazole. Herein, we have presented vari-ous classical approaches for an expeditious synthesis of a wide range of biologically relevant 1,5-disubstituted 1,2,3-triazole analogues. The syntheses of such a class of diversly functionalized tri-azoles have emerged as a crucial investigation in the domain of chemistry and biology. This tuto-rial review covers the literature assessment on the development of various synthetic protocols for the functionalized 1,5-disubstituted triazoles reported during the last 12 years.
WITHDRAWN: Physicochemical, Mineral Content, Nutritional Composition and Phytochemical Properties of Careya Arborea
Authors: Kashyap Nand Kumar , Hait Milan , Bhardwaj Arvind Kumar , Chouhan Naresh , M.M Vaishnav
Published: April 2023

The article has been withdrawn at the request of the authors of the journal Current Nutrition & Food Science.

Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused.

The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php.

BENTHAM SCIENCE DISCLAIMER:

It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously
submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere
must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submitting
the article for publication the authors agree that the publishers have the legal right to take appropriate action against the
authors, if plagiarism or fabricated information is discovered. By submitting a manuscript the authors agree that the copyright
of their article is transferred to the publishers if and when the article is accepted for publication.
Kaempferol: Topical Applications and Nanoformulations in the Treatment
of Diseases
Authors: Preeti  , Akhtar Juber , Verma Amit , Badruddeen  , Khan Mohammad Irfan , Ahmad Mohammad
Published: April 2023

Kaempferol, a natural flavonoid found in numerous fruits, vegetables, and herbs, possesses
many pharmacological activities such as antioxidant, anti-inflammatory and anti-cancer.
Kaempferol has low aqueous solubility and hence has poor oral bioavailability. Numerous promising
techniques were used to enhance its absorption and structural transformation to deliver
kaempferol. Novel pharmaceutical technologies, including nanotechnology, carrier complex and
cocrystals have been established. However, this review discusses how to deliver kaempferol via
topical route in many diseases. This is the earliest review that aims to provide updated information
on chemistry, bioavailability, biosynthesis, therapeutic effects and available nanoformulations
of kaempferol. It also provides future directions so that the overall bioavailability of
kaempferol might be improved, and it may show expansive applications.
The Current Status and Future Direction of Extracellular Nano-vesicles in
the Alleviation of Skin Disorders
Authors: Ghorbani Raziyeh , Hosseinzadeh Simzar , Azari Arezo , Taghipour Niloofar , Soleimani Masoud , Rahimpour Azam , Abbaszadeh Hojjat Allah
Published: April 2023

Exosomes are extracellular vesicles (EVs) that originate from endocytic membranes. The transfer
of biomolecules and biological compounds such as enzymes, proteins, RNA, lipids, and cellular waste
disposal through exosomes plays an essential function in cell-cell communication and regulation of pathological
and physiological processes in skin disease. The skin is one of the vital organs that makes up
about 8% of the total body mass. This organ consists of three layers, epidermis, dermis, and hypodermis
that cover the outer surface of the body. Heterogeneity and endogeneity of exosomes is an advantage that
distinguishes them from nanoparticles and liposomes and leads to their widespread usage in the remedy of
dermal diseases. The biocompatible nature of these extracellular vesicles has attracted the attention of
many health researchers. In this review article, we will first discuss the biogenesis of exosomes, their
contents, separation methods, and the advantages and disadvantages of exosomes. Then we will highlight
recent developments related to the therapeutic applications of exosomes in the treatment of common skin
disorders like atopic dermatitis, alopecia, epidermolysis bullosa, keloid, melanoma, psoriasis, and systemic
sclerosis.
WITHDRAWN: Carnosol Inhibits the Proliferation, Migration, and Invasion of Hepatocellular Carcinoma Cells in vitro by Regulating the AMPK Signaling Pathway
Authors: Kong Shuang , Xiao Wenchang , Ma Tengfei , Chen Yun , Shi Hongjie , Tu Jun , Zou Jiahua , Zhang Meng
Published: April 2023

Since the authors are not responding to the editor’s requests to fulfill the editorial requirement, therefore, the article has
been withdrawn.

Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused.

The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php

BENTHAM SCIENCE DISCLAIMER:

It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously
submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published
elsewhere must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden,
and by submitting the article for publication the authors agree that the publishers have the legal right to take appropriate
action against the authors, if plagiarism or fabricated information is discovered. By submitting a manuscript, the authors
agree that the copyright of their article is transferred to the publishers if and when the article is accepted for publication.
SARS-CoV-2 Infection to Premature Neuronal Aging and
Neurodegenerative Diseases: Is there any Connection with Hypoxia?
Authors: Sivagurunathan Narmadhaa , Calivarathan Latchoumycandane
Published: April 2023

The pandemic of coronavirus disease-2019 (COVID-19), caused by SARS-CoV-2, has become
a global concern as it leads to a spectrum of mild to severe symptoms and increases death tolls
around the world. Severe COVID-19 results in acute respiratory distress syndrome, hypoxia, and multi-
organ dysfunction. However, the long-term effects of post-COVID-19 infection are still unknown.
Based on the emerging evidence, there is a high possibility that COVID-19 infection accelerates premature
neuronal aging and increases the risk of age-related neurodegenerative diseases in mild to severely
infected patients during the post-COVID period. Several studies correlate COVID-19 infection
with neuronal effects, though the mechanism through which they contribute to the aggravation of neuroinflammation
and neurodegeneration is still under investigation. SARS-CoV-2 predominantly targets
pulmonary tissues and interferes with gas exchange, leading to systemic hypoxia. The neurons in
the brain require a constant supply of oxygen for their proper functioning, suggesting that they are
more vulnerable to any alteration in oxygen saturation level that results in neuronal injury with or
without neuroinflammation. We hypothesize that hypoxia is one of the major clinical manifestations of
severe SARS-CoV-2 infection; it directly or indirectly contributes to premature neuronal aging, neuroinflammation,
and neurodegeneration by altering the expression of various genes responsible for the
survival of the cells. This review focuses on the interplay between COVID-19 infection, hypoxia,
premature neuronal aging, and neurodegenerative diseases and provides a novel insight into the molecular
mechanisms of neurodegeneration.
A New Approach to the Position of Acupoints on the Back of Humans
Authors: Xie Shenglong , Liu Zijing , Zhang Liangan , Song Fengfeng
Published: April 2023

Aim:

In order to realize the position of acupoints on the back of humans, a new acupoints positioning
approach combined with machine vision technology is proposed in this paper.

Background:

The acupuncture point (acupoint) is an important reference in the treatment of Traditional
Chinese Medicine (TCM). However, the traditional acupoints positioning method mainly depends on
manpower, which has the disadvantages of low efficiency and relying on practical experience heavily.

Objective:

In order to realize the position of acupoints on the back of humans, a new acupoints positioning
approach combined with machine vision technology is proposed in this paper.

Methods:

Firstly, the distribution of acupoints on the back of humans are determined according to the
meridian theory, and the coordinate of each acupoint are established based on the approach of fingercun
measurement, after review of previous literature and patents. Secondly, the principle of the proposed
acupoints positioning method is introduced based on the skeleton model of humans. Finally, the effectiveness
of the proposed approach is validated by experimental testing.

Results:

The value of emax is around 3.5mm and those of emae and erms are smaller than 0.25mm and
0.45mm, respectively.

Conclusion:

The experimental results prove that the proposed approach possesses the capability of
good adaptive capability and high.
Chess and Acupuncture?
Authors: Litscher Gerhard
Published: April 2023

This editorial briefly describes possible relationships and similarities between chess and acupuncture. Although the methods of chess and acupuncture could not be more different, possible joint effects on the brain can be hypothesized. However, the effectiveness of these joint effects has yet to be proven in scientific studies. Both chess and acupuncture can be used to improve physical and mental well-being. According to the author, the Yintang point could play a key role here.
A Case of Disseminated Cryptococcus Post-Kidney Transplant
Authors: Belal Amer , Lord Shawna , Mehta Rohan , Santos Alfonso
Published: April 2023

Cryptococcosis is a common invasive fungal infection in solid organ transplant recipients (SOTR) that can be challenging to manage. We discuss a case of disseminated cryptococcosis in a transplant recipient. A 26-year-old woman with a history of ESRD from C1q nephropathy, living-related kidney transplant in early 2012, and allograft nephrectomy in 2015, received a deceased donor kidney transplant (DDKT). Induction after the first transplant was anti-thymocyte globulin (ATG) and maintenance immunosuppression (IS) included tacrolimus (TAC), mycophenolate (MMF), and prednisone. In December 2014, she developed nephrotic range proteinuria due to recurrent FSGS failing plasmapheresis and Intravenous immunoglobulin leading to advanced chronic kidney disease and dialysis dependence. MMF was held due to Cytomegalovirus (CMV) DNAemia. In January 2015, she developed bilateral, painful leg ulcers. Skin biopsy, spinal fluid analysis, and culture were positive for Cryptococcus neoformans. She was treated with liposomal Amphotericin B (LAB) for 3 weeks and 5 doses of flucytosine (5FC) followed by maintenance oral fluconazole with recurrence requiring resumption of LAB and 5FC. The patient underwent a transplant nephrectomy in May 2015 following which IS, LAB, and 5FC were discontinued and maintenance fluconazole initiated. In 2018, another skin biopsy revealed a recurrence. Maintenance antifungal was switched to itraconazole based on fungal isolate minimum inhibitory concentration (MIC) leading to remission that persisted through subsequent DDKT in August 2022. Induction IS was ATG and maintenance included TAC, MMF, and prednisone. The post-transplant course was complicated by delayed graft function requiring dialysis for about three weeks, followed by renal recovery. She continues maintenance of itraconazole under the supervision of a transplant infectious disease specialist and cryptococcal disease remains in remission. IS reduction or complete withdrawal is important in managing disseminated cryptococcosis in SOTR. Management of disseminated disease may require an extended course of LAB, 5FC, and maintenance azole based on MIC.
Evaluating the Performance of Hollow Core Slabs (HCS)-Concrete and Simplifying Their Implementation
Authors: Mahboob Amir , Hassanshahi Omid , Hakimi Abdulqaiyoum , Safi Mohammad
Published: April 2023

The largest proportion of the material used in multistory buildings, and thus its carbon impact, is attributed to their slabs being the main contributor of weight. Because of their high strength and concrete self-weight reduction, composite beams with hollow-core slabs were created for their technical and economic benefits, making this system inexpensive and with a reduced environmental impact, thereby lowering carbon emissions. Geometrically, the hollow slab has a sequence of T and L form pieces on both sides. Hollow slabs are a newer roof feature with a little study undertaken in mechanical characteristics that prove its benefits and downsides in construction. It also has sufficient rigidity. In this work, numerous 19 hollow slabs and flat slabs are modeled using the finite element method, and the findings are compared in terms of hollow slab behavior and economic cost. It demonstrates that reducing the concrete beneath the hollow slab promotes cost-efficiency and the effective use of concrete and steel resources and various approaches for this form of the hollow slab are provided. Implementing a modern double-side beam slab is possible using the presented methods in this paper. It opens a door for creating structures with high stiffness and strength versus vertical and lateral load, along with low material volume.
Decision Aids for Patients With Head and Neck Cancer: Qualitative Elicitation of Design Recommendations From Patient End Users
Authors: Stringer Eleah , Lum Julian J , Livergant Jonathan , Kushniruk Andre W
Published: April 2023

Background

Patients with head and neck cancer (HNC) carry a clinically significant symptom burden, have alterations in function (eg, impaired ability to chew, swallow, and talk), and decrease in quality of life. Furthermore, treatment impacts social activities and interactions as patients report reduced sexuality and shoulder the highest rates of depression across cancer types. Patients suffer undue anxiety because they find the treatment incomprehensible, which is partially a function of limited, understandable information. Patients’ perceptions of having obtained adequate information prior to and during treatment are predictive of positive outcomes. Providing patient-centered decision support and utilizing visual images may increase understanding of treatment options and associated risks to improve satisfaction with their decision and consultation, while reducing decisional conflict.

Objective

This study aims to gather requirements from survivors of HNC on the utility of key visual components to be used in the design of an electronic decision aid (eDA) to assist with decision-making on treatment options.

Methods

Informed by a scoping review on eDAs for patients with HNC, screens and visualizations for an eDA were created and then presented to 12 survivors of HNC for feedback on their utility, features, and further requirements. The semistructured interviews were video-recorded and thematically analyzed to inform co-design recommendations.

Results

A total of 9 themes were organized into 2 categories. The first category, eDAs and decision support, included 3 themes: familiarity with DAs, support of concept, and versatility of the prototype. The second category, evaluation of mock-up, contained 6 themes: reaction to the screens and visualizations, favorite features, complexity, preference for customizability, presentation device, and suggestions for improvement.

Conclusions

All participants felt an eDA, used in the presence of their oncologist, would support a more thorough and transparent explanation of treatment or augment the quality of education received. Participants liked the simple design of the mock-ups they were shown but, ultimately, desired customizability to adapt the eDA to their individual information needs. This research highlights the value of user-centered design, rooted in acceptability and utility, in medical health informatics, recognizing cancer survivors as the ultimate knowledge holders. This research highlights the value of incorporating visuals into technology-based innovations to engage all patients in treatment decisions.
Expectations of Anesthesiology and Intensive Care Professionals Toward Artificial Intelligence: Observational Study
Authors: Kloka Jan Andreas , Holtmann Sophie C , Nürenberg-Goloub Elina , Piekarski Florian , Zacharowski Kai , Friedrichson Benjamin
Published: April 2023

Background

Artificial intelligence (AI) applications offer numerous opportunities to improve health care. To be used in the intensive care unit, AI must meet the needs of staff, and potential barriers must be addressed through joint action by all stakeholders. It is thus critical to assess the needs and concerns of anesthesiologists and intensive care physicians related to AI in health care throughout Europe.

Objective

This Europe-wide, cross-sectional observational study investigates how potential users of AI systems in anesthesiology and intensive care assess the opportunities and risks of the new technology. The web-based questionnaire was based on the established analytic model of acceptance of innovations by Rogers to record 5 stages of innovation acceptance.

Methods

The questionnaire was sent twice in 2 months (March 11, 2021, and November 5, 2021) through the European Society of Anaesthesiology and Intensive Care (ESAIC) member email distribution list. A total of 9294 ESAIC members were reached, of whom 728 filled out the questionnaire (response rate 728/9294, 8%). Due to missing data, 27 questionnaires were excluded. The analyses were conducted with 701 participants.

Results

A total of 701 questionnaires (female: n=299, 42%) were analyzed. Overall, 265 (37.8%) of the participants have been in contact with AI and evaluated the benefits of this technology higher (mean 3.22, SD 0.39) than participants who stated no previous contact (mean 3.01, SD 0.48). Physicians see the most benefits of AI application in early warning systems (335/701, 48% strongly agreed, and 358/701, 51% agreed). Major potential disadvantages were technical problems (236/701, 34% strongly agreed, and 410/701, 58% agreed) and handling difficulties (126/701, 18% strongly agreed, and 462/701, 66% agreed), both of which could be addressed by Europe-wide digitalization and education. In addition, the lack of a secure legal basis for the research and use of medical AI in the European Union leads doctors to expect problems with legal liability (186/701, 27% strongly agreed, and 374/701, 53% agreed) and data protection (148/701, 21% strongly agreed, and 343/701, 49% agreed).

Conclusions

Anesthesiologists and intensive care personnel are open to AI applications in their professional field and expect numerous benefits for staff and patients. Regional differences in the digitalization of the private sector are not reflected in the acceptance of AI among health care professionals. Physicians anticipate technical difficulties and lack a stable legal basis for the use of AI. Training for medical staff could increase the benefits of AI in professional medicine. Therefore, we suggest that the development and implementation of AI in health care require a solid technical, legal, and ethical basis, as well as adequate education and training of users.
Difference between Ultra-High Risk of Psychosis and Above-Threshold Psychosis: A Natural Language Processing Analysis (Preprint)
Authors: Dessouli Marie-Alix , Jurek Lucie , Poulet Emmanuel , Fourneret Pierre , Pignon Baptiste , Gauld Christophe
Published: April 2023

BACKGROUND

Psychotic disorders are a major public health issue, and their disability is partially dependent on the duration of untreated condition. Ultra-high risk (UHR) of psychosis is a potential prodromal stage that occurs before the full development of a first episode of psychosis.

OBJECTIVE

One way to differentiate above-threshold psychosis from UHR is to systematically study the scientific “Areas Of Interest” (AOIs) of these conditions.

METHODS

In June 2022, we performed a computational text analysis of associated terms for above-threshold psychosis and UHR using the biomedical database PubMed. We conducted an undirected lexical network analysis to map the 150 first terms in space and used an unsupervised machine learning technique to detect word patterns and automatically cluster AOIs with a topic-modeling analysis.

RESULTS

Between 1853 and 2022, we identified 11,840 articles for UHR (8.1x108 terms) and 417,557 articles for above-threshold psychosis (1.9x109 terms). Four AOIs were detected in the UHR network: clinical and neuropsychological descriptions, comorbidities, community and health care, treatment. Four AOIs were detected in the above-threshold psychosis network: risk factors and dynamic of the disorder, community and health care, neuropsychology, and comorbidities.

CONCLUSIONS

The partial overlap between UHR and above-threshold psychosis suggests that they are closely related but should be distinguished in their methods of investigation and the organization of health care. Considering these non-clinical elements could allow research to structure differential quality care for users of health systems while redirecting priority research areas towards the main areas of interest of these conditions in a logic of precision medicine.
Perceptions of players in the wood-energy market on the effects of their activities on the dynamics of the vegetation cover in the western part of the Plateaux Region in Togo
Authors: Amegna Komla Uwolowudu
Published: April 2023

The efforts made in black Africa in general and in Togo in particular for the preservation of vegetation have had unsatisfactory results. New approaches deserve to be adopted in order to attenuate the anthropic pressures exerted on the vegetation. Taking into account one of the panoply of factors to be examined, this study aims to identify the perceptions of players in the wood- energy market in the western part of the Plateaux Region in Togo in order to better direct their actions towards the protection and preservation of vegetation. The methodological approach of this study is based on the classic methodology of geographical research: field observation, documentary research, interviews and field survey. The results reveal that 16 per cent of the producers recognize that their activities strongly degrade the vegetation. 6 per cent of collectors and 3 per cent of traders have the same perception. In addition, 78 per cent of producers, 82 per cent of collectors and 65 per cent of retailers declared a slight degradation of the plant cover from their activities. The secondary actors, in particular stevedores, shippers and transporters or carriers, unanimously do not recognize the contribution of the wood-energy market to this mechanism.
Similarities of First- and Second- Hand Accounts of Cancer Diagnoses by Two Physicians in the Literature
Authors: Lee Justin
Published: April 2023

First- and second-hand accounts of cancer diagnosis in physicians are rare in the literature. In the books The First Cell: And the Human Costs of Pursuing Cancer to the Last, by Azra Raza, and When Breath Becomes Air, by Paul Kalanithi, similarities are seen. These similarities include devotion of the affected physician to his profession, and use of the literature, imagery, rhetorical questions, and repetition throughout the texts. These two works movingly show the devastating effects a cancer diagnosis has on the lives of these individuals, and how this diagnosis is uniquely devastating to a medical professional who is cognizant of their ultimate prognosis.
Física de la Tierra
Authors: Nava P. F. Alejandro
Published: April 2023

En la pasada reunión de la UGM en Manzanillo se mencionó el problema de la falta de libros acerca de geofísica en español que, destinados a un auditorio joven a nivel de bachillerato o principio de licenciatura, ofrecieran una iniciación atractiva a la geofísica. El presente libro del profesor de la Universidad Complutense de Madrid Dr. Agustín Udías, autor del único texto de sismología en español “Introducción a la Sismología” y traductor de otros libros de geofísica, viene a subsanar la falta arriba mencionada.
Contaminación por partículas atmosféricas en la ciudad de México
Authors: Falcon Y. I. , Ramírez C. R. , Meza J. E. , Daisey J. M. , Lioy P. J.
Published: April 2023

Durante los meses de invierno de 1982 y 1983 se llevaron a cabo muestreos y análisis de partículas atmosféricas, colectadas diariamente en muestreos de 24 horas, utilizando dos equipos de altos volúmenes, localizados en las instalaciones de la Universidad Metropolitana, en el norte de la Ciudad de México. En las muestras del invierno de 1982 se determine la masa orgánica extractable y el contenido de agentes alquilantes en la fracción acetona. Estos análisis se llevaron a cabo en el Centro Médico del Instituto de Medicina Ambiental de la Universidad de Nueva York. En las muestras del invierno de 1983 se analizo el contenido de partículas (PST), sulfatos y varios metales pesados, en los laboratorios de la Universidad Metropolitana-Azcapotzalco. Los resultados del estudio muestran que las concentraciones obtenidas para los diversos componentes de las partículas atmosféricas exceden los valores de las normas internacionales en todos los casos.doi: sin doi
Dynamics and evolution of the lithosphere - results and perspectives of earth sciences research in Mexico: Special Volume – Part 1
Authors: Urrutia Fucugauchi J.
Published: April 2023

Este número de Geofísica Internacional incluye la primera parte de un volumen especial que se publica como parte de las actividades del Comité Nacional para el Programa Internacional de Litósfera (ILP). El ILP fue establecido en septiembre de 1980 por el Consejo Internacional de Uniones Científicas (ICSU), con los objetivos de constituir el mayor programa internacional de investigación interdisciplinaria de la década 1981-1990. El Programa está coordinado por la Comisión Intersindical de la Litósfera (ICL), establecida a pedido de la Unión Internacional de Geodesia y Geofísica (IUGG) y la Unión Internacional de Ciencias Geológicas (lUGS). El establecimiento de ICL siguió una larga tradición de programas internacionales exitosos. entre los dos sindicatos organizados en las décadas anteriores.doi: sin doi
Preliminar y investigations of the extent of Río Grande rift in the northern portion of the state of Chihuahua
Authors: Keller G. R. , Hinojosa J. H. , Dyer J. R. , Aiken C.L.V. , Hoffer J. M.
Published: April 2023

During the past decade, the Río Grande rift has been recognized as one of the major Cenozoic continental rift systems. The other widely recognized rift systems are the East African rift, the Rhine graben, and Lake Baikal. A series of special publications (Riecker, 1979; Baldridge et al., 1984; Keller, 1986) have drawn the attention of the international scientific community to the Río Grande rift. Early studies suggested this rift might only extend as far south as the Socorro, New Mexico región which is about 300 km north of El Paso/Juárez. However, more recent geological (Seaget and Margan, 1979) and geophysical (Daggett et al., 1986; Sinno et al., 1986; Keller et al., 1988) studies document that the rift can be differentiated from the Basin and Range province and extends for a significant distance into the State of Chihuahua.doi: sin doi
30 años de Geofísica Internacional, a note from the Publishers
Authors: Suárez Gerardo
Published: April 2023

Este es el Tomo 30 de GEOFISICA INTERNACIONAL. ¡Felicitaciones a la revista, a los miembros del Consejo Editorial, a los revisores, a los editores y al personal editorial!. Fundada por el Dr. Julian Adem y hábilmente editada durante la primera década por el difunto Manuel Maldonado Koerdell, nuestra revista nunca se perdió un número en 30 años.doi: Sin doi
Comparative study ofionogram F2 peak height from different techniques
Authors: Batista I. S. , Paula E. R. de , Abdu M. A. , Kantor I. J.
Published: April 2023

Hicimos una intercomparaci6n entre los parámetros de altura hmF2, hpF2 y hmF2(M(3000)) deducidos de la curva h'(f) para identificar las condiciones y tendencias, si existiesen, bajo las cuales el hmF2, de acuerdo con el análisis de la altura verdadera de POLAN, podría ser mejor representado por cualquiera de los otros dos parámetros que son obtenidos por consideraciones simples. El análisis es efectuado para una estaci6n de latitud baja y otra ecuatorial, y para dos meses diferentes, representativos del verano y equinoccio locales. El análisis muestra que ambos, el hpF2 y el hmF2(M(3000)),  son casi coincidentes durante la noche y dan una muy buena estimación del hmF2 (de acuerdo con el código POLAN), implicando que cualquiera de ellos puede ser usado para representar Ia altura del pico de la capa F2, dentro de la misma precisión. Sin embargo, durante el día el hpF2 da valores generalmente más altos que el hmF2(M(3000)), siendo la diferencia más pronunciada durante los meses de diciembre (verano local). Durante el día se observa también que el valor estimado de hmF2(M(3000)) supera el de hmF2 (obtenido de POLAN) en la estaci6n ecuatorial, y es inferior al mismo en la estaci6n de latitud baja, mientras que el valor de hpF2 es, en general, superior en ambas localidades.doi: Sin doi
Composición química de Ia fase líquida a descarga total y a condiciones de reservorio de pozos geotérmicos de Los Humeros, Puebla, Mexico
Authors: Tello Hinojosa Enrique
Published: April 2023

Se aplicó en Los Humeros, la técnica desarrollada por Arnorsson y Sigurdsson, (1982) que sirve para estimar la composición química de la fase liquida de un reservorio de dos fases a condiciones de descarga total y a profundidad, a partir del análisis químico del agua separada. Para Ia estimación de la temperatura y de la presión de saturación se utilizó la ecuación de Clausius-Clapeyron dP/P=AdT/RT2 donde R es la constante de los gases y (A) es el calor molar de vaporización. En una primera fase se calcula la fracción de agua en la fase liquida a condiciones de descarga total. Para estimar las concentraciones de los solutos en los pozos de Los Humeros, se parte de 2 suposiciones fundamentales: 1) que los solutos están totalmente disueltos en la fase liquida, (ya que una parte despreciable se encuentra en la fase vapor), 2) que las 2 fases del fluido geotérmico (vapor y agua) están en equilibria en el reservorio. Al realizar los cálculos se encontró que el pozo H-1 produce en una zona de líquido dominante, la cual pudiera representar la parte superior del yacimiento, ya que se comporta como una zona de condensación (Tello, 1989). El resto de los pozos producen en una zona de dos fases.doi: sin doi
Inyeccion de fluidos de baja ental pia en el campo geotermico de Los Humeros, Puebla, Mexico
Authors: Ascencio Cendejas Fernando
Published: April 2023

En este estudio se analizan las consecuencias de la inyecci6n de fluidos de baja entalpía en la producción y estado termodinámico del yacimiento geotérmico de Los Humeros, Puebla. Se utiliza un modelo analítico que evalúa la velocidad de propagación del frente térmico. Se concluye que la inyección de salmuera de desecho en el pozo H-28, a un ritmo de 90 ton/h, no afecta el estado térmico del yacimiento. Se discute la validez de este resultado.doi: sin doi
Magmatismo, hiatus y tectonismo de Ia Sierra Madre Occidental y del Cinturón Volcánico Mexicano
Authors: Garduño-Monroy Víctor Hugo , Gutiérrez Negrín Luis C. A.
Published: April 2023

La distribución espacial de edades radiométricas - de 40 millones de años (Ma) a la fecha - de rocas colectadas en las provincias de la Sierra Madre Occidental (SMO) y del Cintur6n Volcánico Mexicano (CVM) permite identificar tres períodos de tiempo con ausencia de actividad volcanica (hiatus volcanicos): 28-25 Ma, 17-15 May 7-5 Ma, aproximadamente. El primero parece coincidir con el final de una fase compresiva de deformaci6n previa a la de Cuencas y Sierras; el final del segundo parece señalar el inicio del volcanismo basamental del CVM y se relaciona con los plegamientos del Mioceno Medio-Superior; el ultimo solo es evidente en las porciones oriental y occidental del CVM y su final indica el comienzo del volcanismo propio de esta provincia, prolongándose en el sector oriental hasta hace unos 3 Ma. La configuración de los datos radiométricos también refuerza la existencia de una provincia volcánica de edad intermedia entre la SMO y el CVM, que sería el basamento de este último. En este contexto, la falla Taxco-Querétaro juega un papel importante, al delimitar el alcance oriental del volcanismo de la SMO.doi: sin doi
Propiedades magnéticas y petrofábrica de unidades volcánicas terciarias de Ia región de Arandas-Atotonilco, Jalisco, México
Authors: Urrutia-Fucugauchi J. , Molina Garza Roberto S.
Published: April 2023

Se reportan los resultados de un estudio combinado de paleomagnetismo, propiedades magnéticas, observaciones con microscopio óptico en laminas delgadas y superficies pulidas, microscopio electrónico de barrido (SEM) y anisotropia de susceptibilidad magnética (ASM) en varias unidades volcánicas de la región de Arandas-Atotonilco, Los Altos de Jalisco, México. La mineralogía magnética y estados de dominio se estiman de las mediciones de susceptibilidad magnética, dirección e intensidad de la magnetización remanente natural (NRM), coeficientes Q, espectros de coercitividades y de temperaturas de bloqueo, curvas termomagnéticas (temperaturas de Curie), variación de la susceptibilidad en función de bajas temperaturas (temperatura de nitrógeno líquido ), curvas de magnetización isotermal (lRM), desmagnetización por campos alternos (CA) de la IRM de saturación, curvas de magnetización remanente anhisteretica (ARM), es magnetización por CA de la ARM de saturación, pruebas de Lowrie-Fuller de estado de dominio magnético y pruebas de magnetización remanente viscosa. Las características de flujo y petrofábrica se determinan a partir de los datos de ASM. Las direcciones de flujo estimadas de observaciones de campo correlacionan con las direcciones de los ejes de susceptibilidad mínimos. Las intensidades de magnetización de cada sitio y de todos los sitios siguen una distribución logarítmico normal. En general, la mineralogía magnética y los estados de dominio son de naturaleza compleja en los diferentes flujos. Las diferencias y similitudes en y entre las varias unidades se discuten en términos de los parámetros magnéticos e indicadores de estado de dominio. Los experimentos de determinación de paleointensidades se discuten en términos de los datos sobre estado de dominio, en particular en referenda a los datos de temperaturas de Curie, espectro de temperaturas de bloqueo y variación de la susceptibilidad con bajas temperaturas.doi: sin doi
Insertion loss due to a magnetically permeable spherical shell covering a concentric conducting target
Authors: Saraf P. D. , Indira Nagubai D.
Published: April 2023

Se considera un modelo estratificado de dos esferas concéntricas en contacto no galvánico, que representan un cuerpo mineral conductor rodeado de un halo de roca alterada. Se demuestra que: (a) un cambio en las propiedades de la roca madre o de las formaciones mineralizadas distorsiona los parámetros electromagnéticos y puede modificar la sensibilidad de detección en ciertas bandas de frecuencias; (b) las mediciones a varias frecuencias permiten penetrar debajo de una capa de alta conductividad; (c) el parámetro de blindaje presenta patrones diferentes de variaciones de frecuencia según la conductividad de la cubierta, lo que ayuda a distinguir las anomalías electromagnéticas para cada tipo de cubierta. Estos resultados pueden servir para: 1. Comprender el fenómeno de blindaje en situaciones geológicas complejas; 2. generar información de base para la planearon de experimentos electromagnéticos en la exploración minera.doi: sin doi
Petrology and geochemistry of the teloloapan subterrane: a lower cretaceous evolved intra-oceanic island-arc
Authors: Talavera Mendoza Oscar , Ramírez Espinosa Joel , Guerrero Suástegui Martín
Published: April 2023

Al sur del Eje Volcánico Mexicano, el subterreno Teloloapan constituye una de las secuencias tectonoestratigráficas incluidas en el subterreno Guerrero. Este subterreno incluye una unidad basal esencialmente volcánica de edad Hauteriviano-Aptiano (formación villa Ayala), compuesta en su mayoria por basaltos y localmente por andesitas y riolitas. Esta unidad es sobreyacida por una unidad de volcaniclásticos de edad Aptiano superior (formación Acapetlahuaya), una unidad de calizas arrecifales (formación Teloloapan)y calizas detríticas finas (formación Amatepec)del Albiano-Cenomaniano inferior y finalmente por una unidad de lutitas y areniscas (formación Pachivia/Miahuatepec)de edad post-Cenomaniano inferior. Las rocas volcánicas muestran características petrográficas, minearlógicas, geoquímicas e isotópicas típicas de las series calco-alcalinas: (i)presencia de basaltos y andesitas de dos piroxenos y anfíbolo; (ii)cristalización temprana de los óxidos de Fe-Ti; (iii)composición de los clinopiroxenos; (iv)comportamiento del Fe durante la diferenciación; (v)concentraciones elevadas en HFSE y en LREE; (vi)relaciones (La/Yb)N elevadas; y, (vii)valores de E(Nd)bajos. Las características petrológicas, geoquímicas e isotópicas son compatibles con un origen en un arco de islas intra oceánico. Comparadas con las rocas calco-alcalinas intra-oceánicas primitivas, las rocas de Teloloapan están enriquecidas en HFSE (Y, Nb, Zr y en menor grado TiO2)y en HREE. Estas carcterísticas son comparables con las observadas en las series calco-alcalinas medianamente ricas y ricas en K de arcos intra-oceánicos maduros como las series calco-alcalinas de los arcos de Sunda o Antillas Menores. Se sugiere que las lavas de Teloloapan feflejan diversos procesos magmáticos como la fusión parcial de una fuente mantélica ligeramente enriquecida modificada por sedimentos pelágicos subdudctados y posteriormente por cristalización fraccionada y/o acumulación cristalinadoi: sin doi
Los paleoambientes holocenicos de la laguna babicora, Chihuahua, México
Authors: Ortega-Ramírez José R.
Published: April 2023

En la región semiárida de la Laguna de Babícora, al noroeste del Estado de Chihuahua, se estudiaron ocho perfiles estratigráficos que cubren temporalmente el intervalo del Estadía Isotópico I. La interpretación de los resultados de los análisis edimentológicos, estadísticos, estratigráficos y siete fochamientos de 14C, permiten reconstituir y en algunos casos inferir los paleoambientes desde el Wisconsiniano Tardío hasta el Presente. La cronología paleoambiental propuesta en este trabajo es: (1) de ca. 18 ka.

A.P. a ca. 10 ka A.P. ambiente pluvial u Optimo Lacustre; (2) de ca. 10 ka A.P. a ca. 6 ka A.P., disminución de la precipitación y aumento de la temperatura, los ambientes son de tipo pantano; (3) de ca. 6 ka A.P. a 3 ka A.P. las condiciones áridas persisten; sin embargo, las estructuras, la morfología y la sedimentología de los depósitos fluviales sugieren precipitaciones ocasionales abundantes; (4) de ca. 3 ka A.P. al Presente, las condiciones semiáridas que caracterizan en nuestros días la región se instalan, precedidas por una fase de morfocstabilidad manifestada en un paleosuelo (horizonte Bt). De acuerdo con las características paleoambientalcs anteriores, suponemos que las condiciones paleoclimátieas de la región de La Laguna de Babícora fueron similares a las del suroeste de los Estados Unidos; es decir, régimen de lluvias centradas en invierno durante el Wisconsiniano Tardío, y en verano durante el Holoceno.doi: sin doi