bluuebunny/crossref_metadata_2025 huggingface dataset:
Firm Attributes and Tax Avoidance of Nigerian Oil and Gas Firms: Moderating Role of Managerial Ownership
Authors: Tanko Udisifan Michael , Waziri Suleiman Lawan , Yusuf Aminu
Published: September 2023

The study examined the moderating effect of managerial ownership on the relationship between firm attributes and tax avoidance in Nigerian listed oil and gas firm for the period of 2011-2020. Secondary data were extracted from the financial reports and accounts of the companies. The study employed Generalized Least Square (GSL) estimator of the regression model. Study revealed that leverage has positive significant effect on tax avoidance. The study reported that board financial expertise has positive and significant impact on tax avoidance. The study documented that managerial ownership has significant positive impact on tax avoidance. Similarly, managerial ownership positively and significantly moderates the relationship between firm size and tax avoidance. The study recommends that, the board of directors in the oil and gas firms in Nigeria should ensure that shareholding of the insider managers is increase in such a way that the proportion of their shareholding should be minimal which should not be less than 20% of the total shareholding in the company as it was found being among the factors that increase tax avoidance. Doing this will encourage managers to put more effort to work toward improving firm performance. The study also recommends that as leverage improve tax avoidance, firms should obtain more debt than equity to advantage of interest on loan which is tax deductible. Since board financial expertise increase tax avoidance, firm should encourage for inclusion of financial expertise as member of board of director in order to take decision on tax issues which will benefit the company.
Corporate Factors Influencing Holding Period of Stock: An Analysis of Market Capitalization Threshold
Authors: Fonna Rizki Putri Nurita , Diantimala Yossi , Priantana Riha Dedi
Published: September 2023

Objective – This study examines the effect of corporate factors on holding period of common stock. The main corporate factors tested are information asymmetry, firm value, earnings per share, and other corporate factors– profitability, company size, leverage, and liquidity–are selected as control variables.Design/methodology – The samples consist of 876 observations of companies listed on the Indonesia Stock Exchange for 2017-2020. Samples were grouped using the threshold method based on their market capitalization to capture the different impacts based on certain conditions. To examine the hypotheses, we employed multivariate analysis with the threshold method.Results – The results show that market capitalization contributes to determining the corporate factors' effect on the holding period of stock. Simultaneously, corporate factors affect significantly the holding period of stock. The increases in firm value, earnings per share, profitability, leverage, and corporate size extend the holding period. However, the emergence of information asymmetry precisely motivates investors to accelerate the holding period.Research limitations/implications – This research did not consider the impact of the Covid 19 pandemic on data even it used data for 2020 (at the onset of pandemic). For future reseach, we suggest to consider the issue of the Covid 19 pandemic in examining the effect of corporate factors on holding period of stock.Novelty/Originality – This study differentiates the samples based on their capitalization value as the novelty. Previous research did not classify the sample based on its capitalization value so large-value stocks are treated the same as small-value stocks. Actually, investors treat these three groups of stocks in different ways
Advancing Customary Village Development in Bali Through Community Participation: Do Village Government Roles Matters?
Authors: Heryanda Komang Krisna , Dharmayasa I Putu Arya , Suwena Kadek Rai , Irwansyah M. Rudi
Published: September 2023

Objective –The provision of customary village funds in Bali can be viewed as a governmental initiative aimed at the preservation of cultural heritage. For the effective implementation of customary village development, it is imperative to involve the community directly and also acknowledge the role of the government.Methodology –The research was conducted in the Province of Bali with 94 customary villages as research objects. The methodology employed for data collection involved the distribution of questionnaires to the leaders of customary villages. The data was subsequently processed using moderation regression analysis, supplemented by interviews to augment the information provided by the respondents.Results –The study's findings indicate that the involvement of the community had a significant impact on the growth of conventional villages in Bali. The mobilisation of resources by the village government can potentially enhance the impact of community participation on the development of customary villages in Bali.Research limitations/implications –This research only reveals the success of customary village development in terms of community and government participation. This research has the impact that it is necessary to pay attention to the development of traditional villages to maintain local wisdom so that harmonization in society can be realized.Novelty/Originality –The originality of this research found that even though there is a separation of authority between the village government and customary village, the village government is still allowed to mobilize the community to be involved in the development of customary village so that environmental and cultural preservation can be achieved.
EVENTOS DE DIVULGAÇÃO CIENTÍFICA COMO ESPAÇOS NÃO FORMAIS PARA A EDUCAÇÃO EM CIÊNCIAS
Authors: De Souza Luciane Lopes , Imbiriba Matheus Figueira , Freitas Silvia Regina Sampaio , Regatieri Sandro Augusto
Published: September 2023

As atividades extraclasses para o ensino de Ciências são uma constante que evidenciam cada vez mais a sua eficácia para ampliar a rede de saberes sobre as Ciências, sejam elas sociais ou ambientais. Uma das alternativas pedagógicas que contribuem com essa eficácia são os eventos científicos que tem se mostrado grandes articuladores entre a teoria e a prática no processo de ensino e aprendizagem dos estudantes, auxiliando com distintas estratégias didáticas e motivadoras no entendimento dos conteúdos teóricos e divulgando a ciência para toda a sociedade. Este estudo objetiva demonstrar de forma prática como os eventos científicos, realizados em espaços não formais de educação, podem colaborar de maneira efetiva no processo da escolarização para a Ciência de estudantes do município de Tefé no estado do Amazonas. Os eventos aqui analisados correspondem ao Dia da Água, Experiências didáticas para o ensino fundamental a partir da Biotecnologia, e Dia do Meio Ambiente, onde os estudantes participaram de feiras expositivas sobre a temática ambiental fora da sala de aula.
Experimental Investigation on the Impact of Micro-Steel Fibers on the Flat Slabs' Punching Shear Resistance
Authors: Salman Ban A. , Hassan Rafea F.
Published: September 2023

This research examined the effects of micro-straight steel fiber percentage and column form on the punching shear of SFRC slabs. Fibers made of micro steel with a diameter of 0.2 mm and a length of 13mm with an aspect ratio equal to 65 were used. The fiber content varied between 0.5%, 1%, and 1.5% by volume. Four different types of concrete mixes were adopted and tested. Experimental results showed that when the percentage of steel fibers in SFRC increased, its compressive strength, flexural strength, splitting tensile strength, and direct tensile strength improved. This investigation applied a monotonic load to eight cast slabs (two each of conventional concrete of square and circular column sections of the equivalent area while the other six slabs were made with steel fiber concrete. The dimensions of each slab were  (920 x 920 x 80 ) mm. Each slab specimen had essential, edge-based support with square and round column sections. It has been demonstrated that slabs with square column sections endured a relatively higher ultimate load than slabs with circular column segments when the steel fiber dosage was 0.5% or 1.0%. Still, at a steel fiber dosage of 1.5%, circular column segment slabs approached the ultimate load of square column segment slabs. The heterogeneous behavior in concrete can be attributed to the random and unequal distribution of steel fibers throughout the material. There were only flexural fractures visible on the tensile face of the slab. New fractures emerged in the center of the slab as the load increased.
Effect of mobile phone usage on semen analysis in infertile men
Authors: الوتار ياسر , الجلبي ساجدة
Published: September 2023

There has been scientific interest in the possible effects of continuous or pulsed exposure to microwave radiation as emitted by mobile phones. The use of mobile phones adversely affects the quality of semen. To determine the effect of mobile phone use on parameters of semen analysis in infertile men. Cross-Sectional study. Fertility, Infertility and IVF centre in Al – Batool Mosul Teaching Hospital for the period from 2009-2010. This study was conducted on 300 patients complaining of infertility after 2003, their mean age (29.87 ± 6.4) years. They were classified according to their active mobile phone use into group 1: 4 h / day; group 2: 3 h / day; group 3: 2 h / day; group 4: no use. Also they were classified according to the duration of use in years into group A: from 1 – 3 years; group B: from 4 – 6 years. Classification according to position of mobile phone in relation to the body into Group C: Trouser pocket; group D: waist pouch; group E: shirt pocket was done. Semen analysis was carried out for all subjects in addition; serum testosterone measurement was done for 100 subjects. The laboratory values of semen parameters significantly differ in all user groups as compared to non user groups. The longer the duration of daily exposure to cell phones, the greater decrease in semen parameters (sperm count, motility and normal morphology). The lower sperm count, motility and normal morphology were in the group B of mobile phone users who used cell phones for 4-6 years duration as compared to group A who used it for 1-3 years. There was no significant difference in mean serum testosterone e level in different mobile user groups. Keeping cell phones in the trouser pocket has been found to decrease sperm count, motility, and normal morphology as compared to men keeping phones in the waist pouch and shirt pocket. The present study conclude that the use of mobile phone decreases the semen quality in study subjects by decreasing count, motility and normal morphology.
Synthesis , Spectroscopic and Antibacterial Investigation of New Molecular hybridized 4-Aminoantipyrine Derivatives of pharmaceutical Interest
Authors: جوهر فيان , سليم البياتي نهى , عبدالرزاق الشريدة هاتف
Published: September 2023

A new series of a hybridized 4-(N- substituted) aminoantipyrine derivatives with amide linkage backbone aminoantipyrine, series (A),compounds [13a- g] and secondary amine linkage, series(B), compounds [l4a-20a] were prepared through systematic sequence coupling reaction of 4-aminoantipyrine (4-AA) and well established active nitrogen bases moieties of phthalimide,piperidine and substituted aniline derivatives with chloroacetylchloride of actively different chlorine functions. . The antibacterial activity of some selected products was reported
Anti-Mullerian Hormone Is a Significant Marker for Male Infertility
Authors: S. Al – Chalabi Sajeda , T.Al-Wattar Yasir , M .Algalili Islam
Published: September 2023

To evaluate serum anti-Mullerian hormone (AMH) in men with normal, reduced sperm concentration and in azoospermic men as a possible clinical marker of male factor infertility. Prospective study Private clinic of Dr. Yasir Al-Wattar and Al-Batool Teaching Hospital in Mosul. This study was conducted on one hundred male subjects aged less than 50 years for the period from July to November 2011, infertile men were classified according to their sperm count into oligospermics (n=28) and azoospermics(n=47), twenty five men were normal (n=25).Serum concentrations of FSH and Testosterone were measured using ELISA, serum Anti-Mullerian hormone concentrations were measured using AMH/MIS enzyme linked immunosorbant assay kit. Significant differences in serum AMH, FSH and Testosterone concentrations were found between normal, oligospermic & azoospermic men. AMH negatively correlated with FSH in oligospermic and azoospermic men and positively with testosterone in azoospermics and negatively with testosterone in oligospermics. Anti-Mullerian hormone should be evaluated in patients with oligospermia and azoospermia, it may serve as a marker of male infertility.
Computerized histomorphometry in the diagnosis of pre-malignant endometrial lesions
Authors: Abdullah Abdulrazak Aiad
Published: September 2023

Accurate diagnosis of precursors to endometrial cancer is a major challenge to pathologists. D-score is well reproducible and predictive of prognosis than the WHO schema, however it is not widely available, this study is an attempt to design a simple workstation for estimation of D-score. Fifteen samples of endometrium with low grade hyperplasia, fifteen proliferative and eight secretory phase endometria were analyzed by light microscopy and stereology. Severeal architectural and karyometric parameters were evaluated and the D-score was calculated. The volume density of stroma (VPS) was significantly higher in proliferative than secretory and hyperplastic endometria. Among the three diagnostic groups, secretory phase endometria have -significantly- the least VPS. The mean values of glandular surface density (outSD) were higher in secretory endometria as compared to proliferative and hyperplastic endometria, however, the differences was statistically insignificant. All of evaluated nuclear parameters are insignificantly differ between hyperplastic and proliferative endometria. The ratio of longest nuclear axis to shortest nuclear axis (D/d) was significantly less in secretory than proliferative and hyperplastic endometriia. Secretory endometria also have significantly lower mean values of shape factor and significantly higher mean values of contour index than proliferative and secretory endometria. 67% of hyperplastic endometria show D-score values < 0. it seems feasible to estimate D-score for suspected EIN lesions using a semi-automated workstation based on the simple stereologic and morphometric principles described in this study, preferably, if fortified by a future comparative study in which a reference method such as the QProdit system is used.
Synthesis and antibacterial activity of new Sulfamethoxazole derivative.
Authors: HD. AL-Hammoshi Marua , F. Mustafa Yasser , Thannon Jehan
Published: September 2023

In the present work, diazonium salt was synthesized by treatment of the primary aromatic amine of sulfomethoxazole with sodium nitrite, which is directly coupled with m-cresol to give a new sulfamethxazole derivative. Chemical structure of the new derivative was characterized by physical and spectroscopic techniques as UV, FTIR, 1H NMR and 13C NMR spectra. The new derivative [4-(salycilic acid-5”-azo-yl)-N-(5`-methyl-3`-isoxazolyl)benzene-sulfonamide] is characterized by its it is lack of the primary aromatic amine in its structure with no possibility to form hydroxylamine metabolite; which is responsible for allergic reactions; In addition, the new derivative is more water soluble due to the presence of azo- linkage. The new sulfomethoxazole derivative proved to have no antibacterial activity against Pathogenic isolates of G- bacteria (E. coli) used in the present work, and reliable in vitro antibacterial activity against G+ bacteria (Staphyllococcus aureus). Mean IC50 against pathogenic Staph aureus isolates used in the study was about 12µg/ml whereas the mean MIC was 20 µg/ml. Presence of azo-bond may change the mode of action of sulfamethoxazole, make it possible to test this a new compound as new antibacterial agent against G+ bacteria.
New method for determination of diclofenac sodium by High Performance Liquid Chromatography
Authors: Ahmed Atto Riyadh
Published: September 2023

In this study a simple, coast effective and direct simple High Performance Liquid Chromatography (HPLC) method has been developed for the determination of diclofenac sodium in it's pure form and different pharmaceutical preparations. Standard diclofenac sodium and its dosage forms were supplied from Ninava State Company For Drug Industries and Medical Appliances (NDI). HPLC method was developed by using mobile phase which was composed of a mixture of HPLC grade (methanol, acetonitrile and deionized water)in the ratio of (60:20:20) respectively. Separation has been completed within 2 min. Calibration curve was linear, coefficient correlation was found to be 1.00 at a concentration of (0.25-4.0 µg.ml-1). The relative standard deviation (RSD) was found to be >1.2%. The proposed method was successfully applied for the determination of diclofenac sodium in its pure form and different pharmaceutical preparations (injection, tablets, eye drops, suppositories and gel) without using buffer system and there is no inference with additives.
Left ventricular function in type 2 diabetics
Authors: Y. Hussain Fakher
Published: September 2023

Diabetic cardiomyopathy has been proposed as an independent cardiovascular disease and many mechanisms, such as microvascular disease, autonomic dysfunction, metabolic disorders, and interstitial fibrosis, have been suggested as causative factors. However, the exact causes and mechanisms of diabetic cardiomyopathy remain unclear. Several studies have demonstrated evidence for preclinical left ventricular (LV) diastolic dysfunction in patients with diabetes mellitus (DM) independent of coronary disease or hypertension. The prevalence of diastolic dysfunction in asymptomatic patients with type 2 diabetes mellitus or its relation with other diabetic complications (nephropathy, retinopathy, and neuropathy) is not well defined and data are controversial. A case series study of ninety patients with type 2 diabetes mellitus was designed to determine the frequency of asymptomatic left ventricular diastolic dysfunction in type 2 diabetes patients and its relation to patients’ duration, control of diabetes and other factors, the setting was at Diabetes Clinic, Echocardiography Unit and wards of Ibn Sina Teaching Hospital. During the period from the 1st of July to 31st of December 2011, eighty seven consecutive normotensive diabetic patients type 2 (mean age 51.35+8.21 years) and having no coronary artery disease on non invasive testing, were studied for assessment of left ventricular diastolic function using pulsed Doppler at the tip of mitral valve, the peak late (atrial) transmitral flow velocity (A wave), the peak early transmitral flow velocity (E wave),the (E wave) deceleration time and the ratio between (E wave) and (A wave) were assessed. Tissue Doppler was also used to assess the basal septal (medial) mitral valve annular velocities, the peak early basal annular velocity ( E` wave ) and the peak late basal annular velocity (A` wave) in addition E/E` ratio was assessed, left ventricular diastolic function was classified as left ventricular diastolic dysfunction positive and left ventricular diastolic dysfunction negative, further classification in to normal, impaired relaxation and Pseudonormal groups was made, age gender duration of diabetes, atherogenic index, obesity were studied in relation to left ventricular diastolic dysfunction using Chi square and Fissures exact tests, T-tests and ANOVA were used to calculate means and to compare them.
Da meditação em Epicuro, ou do modo como a pragmateía é exercitada pela alma
Authors: Maffezzolli Marcone de Oliveira
Published: September 2023

Este artigo busca apresentar algumas reflexões relacionadas à filosofia de Epicuro no que diz respeito ao modo como a pragmateía (πραγματεία) é exercitada pela alma (psyché) com a finalidade de espelhar um conhecimento acerca da natureza (physiología) num éthos orientado para a imperturbabilidade(ataraxía) e para a autarquia (autárkeia).
Koinonía:
Authors: Bezerra José Eudo
Published: September 2023

Este trabalho tem como propósito apresentar uma compreensão acerca das relações humanas nas comunidades epicuristas. A discussão acerca do modo como viviam os filósofos segundo a ética de Epicuro é uma questão complexa e pouco trabalhada. Uma análise mais detalhada traz à tona propostas para um agir humano livre dos ditames das instituições dominantes, políticas ou religiosas, proporcionando ao indivíduo o exercício da liberdade a partir de uma prática de vida filosófica.
invidia e a ambitionis como motivação para os conflitos civis em Lucrécio
Authors: Freire Antonio Julio Garcia
Published: September 2023

O poema filosófico De rerum natura (DRN) do epicurista Lucrécio (séc. I a.C.) foi escrito e publicado em um período de grande agitação social e política da República Romana. Ao longo do poema, Lucrécio indica a sua preocupação com os conflitos civis da sua época, fato que levou a algumas interpretações do DRN como um trabalho de natureza política (McCONNEL, 2012). Trata-se de uma tese estranha à tradição do Jardim, uma vez que o próprio Epicuro aconselhava o sábio a afastar-se de qualquer atividade política (DL, X, 2008). Tal interpretação pode ser baseada, principalmente, na apropriação do conceito de stásis, usado na antiguidade para denominar os conflitos e guerras civis entre as cidades-estado gregas. Em relação aos conflitos civis, Lucrécio trata de dois conceitos que estão relacionados à tais revoltas: o primeiro, é o da invidia. O segundo – o qual aparece de forma implícita no poema – é o da ambitionis.  As duas noções estão ainda relacionadas a duas outras instâncias da argumentação de Lucrécio: a primeira diz respeito ao medo da morte como causa da invidia. A segunda, tem como foco, demonstrar como a ambitionis leva à queda de governantes e reis. O objetivo deste artigo é analisar passagens específicas do De rerum natura nos Livros III e V, verificando a maneira como Lucrécio relaciona os conflitos civis às noções de invidia e ambitionis.
Seeing Double: Two Cases of Dermatomyositis Misidentified as Erythema Dyschromicum Perstans
Authors: Andrews Laura , Shope Chelsea , Eason Chelsea , Knabel Michael , Elston Dirk
Published: September 2023

Without pathognomonic skin lesions or muscle weakness, early DM may be misdiagnosed as a disorder of hyperpigmentation. A 38-year-old male presented with a one-year history of progressive hyperpigmented patches on the face and neck. Outside biopsy was thought to be consistent with EDP, with which the patient’s identical twin brother had recently been diagnosed. Later skin exam was notable for progression to erythematous and hyperpigmented slightly scaly macules and patches of the face, faint pink thin plaques on bilateral extensor forearms and bilateral retroauricular creases, and proximal nailfold capillary dilation and dropout. These findings raised concern for dermatomyositis. Repeat biopsies were suggestive of CTD. ANA was weakly positive. Extended myositis panel was negative. Re-evaluation of his twin brother’s biopsy showed similar findings. The twin’s ANA was negative, and extended myositis panel is pending. Ultimately, both were diagnosed with DM. Work-up for muscle and systemic involvement is underway. Our patient was started on MMF 500mg BID, which was increased to 1000mg BID at follow up. After little improvement on MTX, the patient’s twin brother was switched to MMF 1000mg BID. Diagnosis of DM is particularly challenging in patients lacking classic dermatologic findings or myopathy. Recognition of subtle signs of DM, histopathologic analysis, and presence of MSAs may aid in correct diagnosis.
Analysis of the timing and the usage of drains following cranioplasty on outcomes and the incidence of bone resorption
Authors: Morgan Ryan D. , Kharbat Abdurrahman F. , Collins Reagan A. , Garza John , Belirgen Muhittin , Nagy Laszlo
Published: September 2023

Background:

Pediatric cranioplasty is associated with a high rate of complications, including bone resorption (BR) in 20–50% of cases. We aimed to evaluate factors contributing to BR, including the effect of the timing of cranioplasty and the use of post-surgical drains.

Methods:

This is a dual institution retrospective review of all patients under 18 years old who underwent a cranioplasty following a decompressive craniectomy (DC) for the treatment of traumatic brain injury between 2011 and 2021. Early cranioplasty was defined as within 30 days after DC and late cranioplasty as >30 days. Patients were grouped by BR and separately by timing to cranioplasty. Groups were compared based on the Glasgow Outcome Scale (GOS) and postoperative drain usage.

Results:

A total of 30 patients were included in the study. The mean age was 7.39 (standard deviation = 6.52) and 60% were male. The median time to cranioplasty was 13 days (interquartile range = 10–17). BR was present in 16.7% of cases. A subgaleal drain was utilized in 93.3% and an external ventricular drain (EVD) in 63.3% of patients following cranioplasty. Drain usage was not associated with BR and timing to cranioplasty was not associated with discharge or 6-month GOS.

Conclusion:

This study demonstrates that early cranioplasty following DC may have similar outcomes to late cranioplasty. Post-surgical EVDs and subgaleal drains did not increase the incidence of BR, suggesting their importance in the postoperative management of these patients.
Rigid but nonmetallic cranioplasty after pterional craniotomy: Technical note
Authors: Sanada Yasuhiro , Tsuji Kiyoshi , Hamada Yuumi , Fujishima Kazuhiro , Furukawa Kentaro , Fukawa Norihito , Kubota Hisashi , Satow Tetsu , Takahashi Jun C.
Published: September 2023

Background:

Given the popularity of pterional craniotomy, numerous modifications have been made to prevent postoperative deformities. With the advent of titanium plates, fixation has become both simple and excellent. However, titanium plates can cause skin problems, infection, or cause skull growth to fail.

Methods:

To develop a simple, cost-effective, and esthetically satisfactory fixation method, without the use of non-metallic materials, six young and older patients underwent pterional craniotomy. CranioFix Absorbable clamps were used to fix the bone flap in the frontal and temporal regions such that the frontal part was in close contact with the skull. After fixation, the bone chips and bone dust were placed in the bone gap and fixed with fibrin glue. We measured the computed tomography values of the reconstructed area and thickness of the temporal profiles postoperatively over time.

Results:

Bone fusion was achieved in all patients by 1 year after surgery. Both the thickness of the temporalis muscle and the thickness of the temporal profile had changed within 2 mm as compared with the preoperative state.

Conclusion:

Our simple craniotomy technique, gentle tissue handling, and osteoplastic cranioplasty yielded satisfactory esthetic results and rigidness in pterional craniotomy.
Migration of the ventriculoperitoneal shunt into the thoracic cavity: A case report and pitfalls of the rib structure
Authors: Yokoya Shigeomi
Published: September 2023

Background:

Although ventriculoperitoneal shunting (VPS) is a universal treatment for hydrocephalus, it is generally well-known that the procedure often has complications. Shunt catheter migration is one such complication, but no reports of migration into the thoracic cavity are associated with the surgical technique. Herein, I present a case of thoracic cavity migration of a shunt catheter alongside anatomical pitfalls of the rib structure.

Case Description:

The patient was a 62-year-old male diagnosed with subarachnoid hemorrhage due to craniocervical junction arteriovenous fistula and underwent direct surgery to occlude the fistula. We performed VPS for secondary hydrocephalus 1 month later. During VPS, the peritoneal catheter was tunneled subcutaneously over the clavicle to pass from the head to the abdomen. Several months later, the peritoneal catheter had migrated from the peritoneal cavity to the thoracic cavity. A computed tomography scan showed that the peritoneal catheter tunneled subcutaneously over the clavicle, penetrated the thoracic wall through the intercostal space between ribs 1 and 2, and entered the thoracic cavity.

Conclusion:

When performing VPS, it is not enough to send the passer through the skin over the clavicle; it must also be tunneled subcutaneously over the ribs while confirming the position of the tip by touch.
SURFACTANTS AS A WAY TO IMPROVE THE ADSORPTION OF BACTERIA ON THE SURFACE OF MINERALS IN THE PROCESS OF BIO-LEACHING
Authors: Пурлац В.Э.
Published: September 2023

Извлечение металлов классическими способами переработки обедненных руд сопровождается высоким уровнем загрязнения окружающей среды. Процесс биовыщелачивания является альтернативным решением этой проблемы. Однако эта технология затруднена из-за низкой кинетики бактериального процесса. Следовательно, особенно важно найти методы для повышения скорости выщелачивания. Один из таких методов включает в себя изменение физико-химических свойств поверхностей минералов и наружных мембран бактерий, что может усилить взаимодействие между микробами и минералами и увеличить скорость выщелачивания. Некоторые исследования показали, что адгезию бактерий на поверхности минералов можно регулировать добавлением поверхностно-активных веществ. Рассмотрена роль поверхностно-активных веществ как одного из методов повышения эффективности биологического выщелачивания низкосортных руд. Был сделан краткий литературный обзор, по применению поверхностно-активных веществ.

The formation of biofilms on sulfide minerals is a complex multi-stage process that includes cell adhesion, formation of microcolonies, their maturation and detachment. The process of creating biofilms is influenced by many factors, including the properties of the surface of minerals on the adsorption and formation of biofilms of acidophilic microorganisms on mineral rocks. Changing the properties of the surfaces of minerals and the outer membranes of bacteria enhances the interaction between microbes and minerals to increase the rate of leaching. Some studies have shown that the adsorption of bacteria on the surface of minerals can be regulated by the addition of surfactants, since this can change the physico-chemical properties of minerals and the outer membrane of microorganisms. The role of surfactants in the process of bacterial leaching of low-grade ores is considered. The literature data concerning the use of surfactants in the process of bacterial leaching were given.
Identification of dwarfing alleles in the collection of durum wheat
Authors: Архипов А.В. , Беспалова Л.А. , Яновский А.С. , Воропаева А.Д. , Черноок А.Г. , Коробкова В.А. , Назарова Л.А. , Ульянов Д.С. , Самарина М.А. , Мудрова А.А. , Карлов Г.И. , Дивашук М.Г.
Published: September 2023

Гены короткостебельности (Rht) имеют большое разнообразие аллельных вариантов и различаются по степени влияния на высоту растений и другие составляющие структуры урожайности пшеницы. Многие широко распространённые аллели генов короткостебельности оказывают в том числе и негативное влияние на признаки продуктивности и адаптацию к условиям внешней среды, поэтому актуальным является поиск, изучение и внедрение в сорта пшениц других генов. Целью работы являлось изучение коллекции из 79 озимых и 76 яровых образцов твёрдой пшеницы НЦЗ им. П. П. Лукьяненко с помощью молекулярных маркеров для определения аллелей Rht-B1b, Rht-B1e, Rht-B1a и оценки разнообразия внутри коллекций по исследуемым генам. В нашей работе использовались молекулярные маркеры нового поколения — KASP-маркеры, основанные на конкурентной аллель-специфичной ПЦР. По данным исследования, в изученных образцах яровой и озимой твёрдой пшеницы отсутствует аллель Rht-B1e. В ходе исследований было выявлено, что среди озимых форм твёрдой пшеницы 99% образцов имеют мутантный аллель Rht-B1b, среди яровых пшениц 86% образцов представлено этим аллелем. Аллель дикого типа (Rht-B1a) был обнаружен только у одного озимого сорта и 11 образцов яровой твёрдой пшеницы. В связи с расширением ареала возделывания сортов твёрдой пшеницы краснодарской селекции, в НЦЗ им П.П. Лукьяненко ведутся работы по внедрению новых аллелей генов редукции высоты для повышения разнообразия аллелей генов короткостебельности. В настоящий момент такие образцы проходят испытания в селекционных питомниках.

Dwarfing, or reduced height genes (Rht) have a large number of alleles and differ in their impact on plant height and other yield traits in wheat. Many dwarfing alleles, commonly present in plant DNA, negatively affect crop productivity and stress-resistance. Therefore, search for and introduction of new genes in wheat genome gained a significant attention. The aim of this experiment was to screen the collection of 79 winter and 76 spring genotypes of durum wheat from the National Grain Center n. a. P. P. Lukyanenko to identify the Rht-B1b, Rht-B1e, Rht-B1a alleles and analyze their diversity in plants using molecular markers. This experiment focused on the new generation of molecular markers — KASP-markers, based on kompetitive allele specific PCR (KAMP). Rht-B1e was not observed in the pool of the DNA tested. Around 99% of winter and 86% of spring genotypes of durum wheat had mutant allele of Rht-B1b. Wild-type Rht-B1a was identified only in one winter and 11 spring genotypes. Due to wider cultivation of the varieties of durum wheat of the Krasnodar breed, the National Grain Center n. a. P. P. Lukyanenko is participating in the number of projects to introduce new dwarfing alleles into crop genome and increase their diversity. Currently, these genotypes are undergoing trials in the breeding nurseries.
ChemBERTa-2: Fine-Tuning for Molecule’s HIV Replication Inhibition Prediction
Authors: Nowakowska Sylwia
Published: September 2023

Two versions of Large Language ChemBERTa-2 models, pre-trained with two different methods, were fine-tuned in this work for HIV replication inhibition prediction. The best model achieved AUROC of 0.793. The changes in distributions of molecular embeddings prior to and following fine-tuning reveal models’ enhanced ability to differentiate between active and inactive HIV molecules.
Process-performance of solid sorbents for Direct Air Capture (DAC) of CO2 in optimized temperature-vacuum swing adsorption (TVSA) cycles
Authors: Balasubramaniam Bhubesh Murugappan , Thierry Phuc-Tien , Lethier Samuel , Pugnet Veronique , Llewellyn Philip , Rajendran Arvind
Published: September 2023

The process performance of five solid sorbents was evaluated for direct air capture (DAC) of CO2 in temperature-vacuum swing adsorption (TVSA) and steam-assisted temperature vacuum swing adsorption (s-TVSA) cycles via detailed process modelling. The unary CO2, H2O and binary CO2-H2O isotherm data, wherever available, were fit to suitable isotherm models and then integrated with the detailed process model. The trade-off between specific energy and CO2 productivity has been studied through rigorous process optimizations. The study shows that thermal energy demand is substantial in comparison to the electrical energy. The role of steam was primarily found to improve the productivity. The range of minimum specific energy values is between 6.25-30.4 MJth/kg CO2, although, for some of the sorbents, the lack of H2O adsorption data impedes reliable calculations. The range of maximum CO2 productivities observed is between 0.01-0.15 TPD of CO2/m3 of sorbent
Photoresponsive Arylazopyrazole Surfactant/PDADMAC Mixtures: Reversible Control of Bulk and Interfacial Properties
Authors: Hardt Michael , Honnigfort Christian , Carrascosa-Tejedor Javier , Braun Marius , Winnall Samuel , Glikman Dana , Gutfreund Philipp , Campbell Richard A. , Braunschweig Bjoern
Published: September 2023

In many applications of polyelectrolyte/surfactant (P/S) mixtures, mostly their static properties are exploited, because it is difficult to fine-tune them after mixing the components without changing the sample composition, e.g. pH or the ionic strength. Here we report on a new approach where we use photoswitchable surfactants to enable drastic changes in both the bulk and interfacial properties. Poly(diallyldimethylammonium chloride) (PDADMAC) mixtures with three alkyl-arylazopyrazole butyl sulfonates (CnAAP) with -H, -butyl and -octyl tails are applied and E/Z photoisomerization of the surfactants is used to cause substantially different hydrophobic interactions between the surfactants and PDADMAC. This affects significantly the P/S binding and allows for tuning both the bulk and interfacial properties of PDADMAC/CnAAP mixtures through light irradiation. For that, we have fixed the surfactant concentrations at values where they exhibit pronounced surface tension changes upon E/Z photoisomerization with 365 nm UV light (Z) and 520 nm green (E) light and have varied the PDADMAC concentration. The electrophoretic mobility can be largely tuned by photoisomerisation of CnAAP surfactants and P/S aggregates, which can even exhibit a charge reversal from negative to positive values or vice versa. In addition, low colloidal stability at equimolar concentrations of PDADMAC with AAP surfactants in the E configuration leads to large aggregates that form in the bulk, but can be redissolved by irradiation with UV light when the surfactant‘s alkyl chain is short enough (C0AAP). Vibrational sum-frequency generation (SFG) spectroscopy reveals changes at the interface similar to the bulk, where the charging state at air-water interfaces can be modified with light irradiation. Using SFG spectroscopy, we interrogated the O-H stretching modes of interfacial water molecules and provide qualitative information on surface charging that is complemented by neutron reflectometry, from which we resolved the surface excess of PDADMAC and CnAAP at the air-water interface, independently.
Asherah, by Tilde Binger - A Feminist Companion to Reading the Bible, by Athalya Brenner-Idan - Neo-Assyrian Historical Inscriptions and Syria-Palestine, by Jeffrey Kah-Jin Kuan
Authors: Mitchell Mary Louise
Published: September 2023

The author in this one submission offers a review of three different books, which all seek to discuss  Feminist Biblical Scholarship.

1. Asherah: Goddesses in Ugarit, Israel and the Old Testament. By Tilde Binger. JSOT Supplement Series 232. Sheffield: Sheffield Academic Press, 1997. ISBN 1-85075-637-6. Pp. 190.

2. A Feminist Companion to Reading the Bible: Approaches, Methods, Strategies. Ed. Athalya Brenner and Carole Fontaine. Sheffield: Sheffield Academic Press, 1997. ISBN 1-85075-674-0. Pp. 654.

3. Neo-Assyrian Historical Inscriptions and Syria-Palestine: Israelite-JudeanTyrian-Damascene Political and Commercial Relations in the Ninth-Eighth Centuries BCE. By Jeffrey Kah-Jin Kuan. Jian Dao Dissertation Series, 1. Bible and Literature, 1. Hong Kong: Alliance Bible Seminary, 1995. ISBN 692-7997-09-9. Pp. 281.
Engaging Agamben on the Time that Remains
Authors: Farrow Douglas
Published: September 2023

Giorgio Agamben's work at the intersection of political theology, biblical exegesis, and culture criticism is taken up appreciatively. In an argument framed by Paul's Damascus Road experience, key texts such as 1 Corinthians 7 and Romans 9–11 are explored with Agamben, new proposals being made, to set the stage for a discussion of 2 Thessalonians 2. Successful treatment of this last text, and of the dialectic of law and lawlessness as it appears there, requires more attention to context than Agamben affords. That includes the Thessalonian correspondence as a whole, the teaching of Jesus, and the book of Daniel that underlies both. It also includes an appreciation of the narrative and liturgical framing of Pauline eschatology. While Agamben is questioned on this score, and his reading of 2 Thessalonians 2 challenged, common cause is made in critique of church/state alliances around pandemic policy, alliances based on a lawless use of law.
SCIENTIFIC COMMUNICATION AS A MECHANISM FOR THE DEVELOPMENT OF INTELLECTUAL CAPITAL
Authors: Фомин М.В.
Published: September 2023

Цель статьи – показать развитие сферы научной коммуникации в России и мире, а также изменения, происходящие в отрасли, начиная с санкционных событий 2022 года. Автором раскрыты структура и динамика списков научных изданий как элементы управления развитием интеллектуального капитала. Научная новизна заключается в представлении перспективных направлений развития инструментария научных коммуникаций.

The purpose of the article is to show the development of the sphere of scientific communication in Russia and the world, as well as changes taking place in the industry, starting with the sanctions events of 2022. The author disclosed the structure and dynamics of lists of scientific publications as a mechanism for the development of intellectual capital. Scientific novelty lies in the presentation of promising directions for the development of the tools of scientific communications.
PUBLIC PROCUREMENT SYSTEM IN THE REPUBLIC OF BELARUS: CURRENT STATUS AND DEVELOPMENT TRENDS
Authors: Добринец Я.И. , Друк В.Ю.
Published: September 2023

Актуальность темы исследования определяется необходимостью дальнейшего совершенствования системы госзакупок Республики Беларусь на основе опыта сопредельных стран (в первую очередь стран-участниц ЕАЭС), а также созданием условий для повышения эффективности деятельности хозяйственных субъектов с долей государственного участия. Цель статьи  на основе проведенного исследования статистики закупок за счет бюджетных средств, выявить наиболее востребованные виды процедур закупок; определить проблемы и особенности их организации. Научная новизна статьи состоит в выявлении влияния интеграционных процессов на систему закупок Республики Беларусь. Исследования проводятся в рамках НИР «Разработка эффективных инновационных и инвестиционных механизмов, направленных на обеспечение экономической безопасности Республики Беларусь (2021-2025 гг.) по ГПНИ «Общество и гуманитарная безопасность белорусского государства».

The relevance of the research topic is determined by the need to further improve the system of public procurement in the Republic of Belarus on the basis of the experience of neighboring countries (primarily EAEU member states), as well as to create conditions necessary for raising the efficiency of economic entities with a state-owned share. The purpose of the article is to identify the most popular types of procurement procedures on the basis of the conducted study of procurement statistics at the expense of budgetary funds; to determine the problems and peculiarities of their organization. Scientific novelty of the article is to identify the impact of integration processes on the procurement system of the Republic of Belarus. The research is carried out within the framework of the research work “Development of effective innovation and investment mechanisms aimed at ensuring the economic security of the Republic of Belarus (2021-2025) under the State Research Program “Society and Human Security of the Belarusian State”.
FORMATION OF PRIVATE INVESTMENT PORTFOLIO IN THE RUSSIAN STOCK MARKET
Authors: Гуляева О.С. , Андроник В.И.
Published: September 2023

В статье на основе использования инструментов фундаментального и технического анализа разработаны рекомендации по формированию наиболее доходного портфеля инвестора – физического лица. Целью исследования является разработка этапов формирования инвестиционного портфеля ценных бумаг российских эмитентов. Авторами предложено при формировании инвестиционного портфеля по модели Г. Марковица и У. Шарпа использование дополнительных фильтров с целью обеспечения его наибольшей доходности. Научная новизна полученных результатов заключается в разработке методики формирования инвестиционного портфеля частного инвестора путем введения дополнительных фильтров в широко распространённые модели Г. Марковица и У. Шарпа.

The authors develop recommendations to set up the most profitable portfolio for a private investor based on the use of fundamental and technical analysis in this article. The purpose of the study is to develop a methodology for building of an investment portfolio of Russian securities. The authors propose the use of additional filters to build an investment portfolio according to the model of G. Markowitz and W. Sharp in order to ensure its highest profitability. The scientific novelty of the results obtained lies in the development of a methodology for building a private investment portfolio by introducing additional filters into the model of G. Markowitz and W. Sharp.
ACTUAL PROBLEMS OF THE RESIDENTIAL REAL ESTATE MARKET IN THE MOSCOW REGION
Authors: Глазков К.В.
Published: September 2023

В рамках статьи проведено исследование динамики показателей рынка жилой недвижимости российских регионов, выявлены актуальные проблемы. Целью исследования является определение перспектив развития рынка жилой недвижимости Москвы и Московской области и необходимых изменений в системе его регулирования. На основе избранного индукционного подхода автор переходит от частных фактов к общетеоретическим выводам. Научная новизна представленных результатов заключается в установлении причинно-следственных связей между актуальными проблемами на рынке жилой недвижимости Московского региона и действием последовательно возникавших негативных факторов, среди которых пандемические, санкционные и ценовые. Автор делает вывод о том, что современное состояние данного рынка требует построения системы регулирования, которая способна обеспечить сбалансированность рыночного спроса и предложения в условиях повышенной турбулентности внешней среды.

The article analyzes the dynamics of indicators of the residential real estate market in Russian regions and its urgent problems. The purpose of the study is to determine the prospects for the development of the residential real estate market in Moscow and the Moscow region and the necessary changes in the system of its regulation. Based on the chosen inductive approach, the author moves from particular facts to general theoretical conclusions. The scientific novelty of the presented results lies in the establishment of cause-and-effect relationships between current problems in the residential real estate market of the Moscow region and the action of successively emerging negative factors, including pandemic, sanctions and price factors. The author concludes that the current state of this market requires the construction of a regulatory system that is able to balance market demand and supply in conditions of increased turbulence in the external environment.