bluuebunny/crossref_metadata_2025 huggingface dataset:
Music Recommendation System using Content and Collaborative Filtering Methods
Authors: Singh Swapna
Published: May 2022

Rapid development of mobile devices and internet has made possible for us to access different music resources freely. While the Music industry may favor certain forms of music over others, it's important to grasp that there isn’t one human culture on earth that has existed without music. during this paper, we've designed, implemented and analyzed a song recommendation system. we've used Song Dataset provided to search out correlations between users and songs and to find out from the previous listening history of users to supply recommendations for songs which users would like to concentrate most. The dataset contains over ten thousand songs and listeners are recommended the simplest available songs supported the mood, genre, artist and top charts of that year. With an interactive UI we show the listener the highest songs that were played the foremost and top charts of the year. Listener even have the choice to pick out his/her favorite artist and genres on which songs are recommended to them using the dataset. Keywords- Collaborative model, Content based model, Recommendation System, Popularity model
Modeling and Controller Design for Temperature Control of Heat Exchangers in Power Plants
Authors: Surekha K.
Published: May 2022

A heat exchanger is a device that transfers heat from one place to another. Because it can withstand a wide range of temperature and pressure, the power plant heat exchanger is widely employed in chemical and petroleum facilities. A heat exchanger is a device that transfers heat from one place to another. Plant with strong nonlinearity and low dynamics; as a result it is tough to model and manage its dynamics. There are two types of heat exchanger models in this study. For selecting an appropriate model, controllers are used. Controller. (Physical model) is the first model. Generated from genuine heat exchanger plant parameters Second, there's Dead Time plus a Second Order (SOPDT model)This is obtained from the heat exchanger's response. While The controllers are made up of fuzzy proportional controllers. Proportional integral (FPD) controller and derivative (FPD) controller applied to the model as a derivative (PID) controller Their comments are compared to those of the others. Keywords Power Plant Heat Exchanger, Modelling, Fuzzy Control.
SCHEMING OF CONTROLLER FOR SINGLE STAGE SOLAR PV FED BLDC MOTOR-DRIVEN WATER PUMP
Authors: Sujanaveena B.
Published: May 2022

To optimize the solar photovoltaic (PV) generated power using a maximum power point tracking (MPPT) technique, a DC-DC conversion stage is usually required in solar PV-fed water pumping which is driven by a brushless DC (BLDC) motor. This power reformation stage leads to an increased cost, size, difficulty, and decreased efficiency. As a unique solution, this work addresses a single-stage solar PV energy conversion system feeding a BLDC motor pump, which eliminates the DC-DC conversion stage. A simple control technique capable of operating the solar PV array at its peak power using a common voltage source inverter (VSI), is proposed for BLDC motor control. The proposed control eliminates the BLDC motor phase current sensors. No supplementary control is associated with the speed control of the motor pump and its soft start. The speed is controlled through the optimum power of the solar PV array. The suitability of the proposed system is exhibited through its performance evaluation using MATLAB/Simulink-based simulated results. keywords: MPPT, solar PV array, BLDC motor, Water pump, Voltage source inverter (VSI)
Automation of Home Essentials using IoT
Authors: E R Alan Mark
Published: May 2022

As humans, we tend to leave the fans and lights ON while leaving the room which consumes a lot of electricity without our knowledge. To reduce electricity consumption and provide comfortability, an attempt is made to automate the home essentials using the IoT. IoT technology has a huge potential to take over the control of home appliances in the coming years. IoT technology will help control home appliances through a mobile device. By automating the home appliances, saving and tracking the usage of electricity would become easier. This paper aims at providing an insight into how IoT, Computer Vision, and commercial off-the-shelf circuit boards like Raspberry Pi and sensors could be interconnected and used to control the home appliances being away from home. Home security systems could also be integrated with the developed system to monitor and secure the house from a remote place. Key Words: IoT, Raspberry Pi, Home appliances, sensors, mobile device.
Silver Vessels from the Maykop Barrow (Oshad): Realistic Drawings with the Magical Overtones
Authors:   Zoological Institute of Russian Academy of Sciences, Sablin Mikhail , Kim Polina ,   Zoological Institute of Russian Academy of Sciences
Published: May 2022

In 1897 Russian archaeologist N. I. Veselovsky excavated an Early Bronze Age burial mound on the eastern outskirts of Maykop town. He found some silver vessels covered with images, made by the technique of contour embossing. Although the landscapes, flora and fauna on these objects, most likely performing a ritual function, were conveyed with a high degree of reliability, the original meaning of the images still remains a subject of controversy. The total floristic and faunal composition of the drawings is quite extensive: two species of plants, three species of birds, eight species of mammals. Most of the researchers who previously dealt with this issue spoke about the impossibility of considering these images as ordinary drawings, believing that they have a deep meaning. The joint circular movement in the sun is considered an extremely favorable magical effect for most of the peoples of Eurasia. The large wild animals are important intermediaries between humans and gods. For example, in ancient Hittite and Siberian mythology, they represented the sacred totems “beasts of the gods” or “patron spirits”. Most likely, the drawings on the vessel “with the landscape” make up a single semantic composition, the plot, perhaps the simplest map-scheme: a bear guards the World Tree growing far in the north at the foothills of the World Mountain, where the two sacred rivers originate from.
Spatial Organization and Cave Paintings of Toleubulak Large Grotto in Mugodzhar
Authors:   Institute of Archaeology named after A. Kh. Margulan, Baitileu Darkhan , Taimagambetov Zhaken ,   National Museum of the Republic of Kazakhstan, Mamirov Talgat ,   Institute of Archaeology named after A. Kh. Margulan
Published: May 2022

This article introduces the material on the Mugodzhar petroglyphs for scientific discussion. For the first time, full-fledged copies of cave paintings obtained during the continuous fixation of the flat surfaces of the Toleubulak large grotto are published, which allows attracting a wide range of researchers to study and analyze the earliest rock art of Kazakhstan. A comparative and narrative-stylistic study and an analysis of the technique of cave paintings in the Toleubulak large grotto helped to identify three main chronological layers with cave paintings: petroglyphs of the pre-Paleometallic epoch (Neolithic), petroglyphs of the transition period from the Stone Age to the Bronze Age (Eneolithic–Early Bronze) and petroglyphs of the Late Bronze Age. The new interpretation of cave paintings of mushroom-shaped figures of the late Bronze Age is proposed. Thus, parallels are drawn with the images of the labyrinths of Dagestan, the drawings on the Northeastern Caspian sanctuary, the labyrinths of the White Sea and the arrow-shaped structures of Ustyurt.
Lucy as A ‘Rising Character’: Character Analysis of Lucy Snowe of Charlotte Brontë’s Villette
Authors: Aruna
Published: May 2022

In Villette, Charlotte Brontë portrays a woman’s growth in an incredibly subtle way. Her heroine goes through a lonely and painful process from awakening to transformation. Lucy Snowe possess inner strength and she rises out of difficult circumstances --- suffering, seeking, surviving and finding her career. Charlotte’s insights about love,career, marriage and life are more matured compared to her previous novels , she also presents her deeper concern and reflection on Victorian women's situation in the novel. Inspired by Lucy Snowe’s spirit, this paper briefly analyses her sterling character and how she rises from an unrecognized woman to a respected teacher.
Hooked By Avatars? Literature Studies in Upper Secondary School—A Simulation Study
Authors: Graeske Caroline , Sjöberg Sofia Aspling , Thunberg Stina
Published: May 2022

Several studies have shown that Swedish students’ reading comprehension and ability to understand fiction are decreasing year by year. Numerous alarming reports point to the unsustainable situation concerning young people’s reading engagement, but the ideas of how it can be remedied are few. This study aims to investigate and evaluate a didactic design that includes avatars as game elements in order to promote students’ reading of fiction. What opportunities and challenges might such a design present? In the study, an action research method and game theory were used, where teachers and researchers collaboratively explored and evaluated the outcome. The results showed that this design offered many opportunities and generated reading engagement. The students co-design their learning by creating an avatar and then entering the fictional world of a short story. Creating an avatar that interacts with the fictional text requires both participation, reading comprehension and meta analytic skills. However, the design also presented challenges, that some students did not link their avatars clearly to the text and instead did their own stories. The design could thus be further developed to provide more room for avatars to interact more with the chosen literary environment.
The Leadership Enhancement in Education 4.0 School Administrators
Authors: Raksanakorn Kuljira , Khumsamart Supattarasak , Ratthananin-Anan Tuwanan
Published: May 2022

The objectives of this research were: 1) to study the components, 2) to study the current situation and the desirable conditions, and 3) To assess needs for enhancement of leadership of school administrators in Education 4.0 under the Office of Secondary Education Service Areas in the Northeast region. The sample group included schools under the Office of Secondary Educational Service Areas in the Northeast region. The data were collected from 15 school administrators, 365 teachers, with the total number of 380 persons by using Stratified Random Sampling. The instruments used in this research were component evaluation form and questionnaire. The statistics used for data analysis comprised percentage, mean, standard deviation, reliability and PNI modified. The research results were found that: I. The components for leadership enhancing in education 4.0 professional administrators consisted of 7 components as follows: 1) Knowledge and ability, 2) Leadership skills, 3) Academic skills, 4) Morality and ethics, 5) Modern skills, 6) Characteristics, and 7) Results of performance. II. The current situation for leadership enhancing in education 4.0 professional, in overall, was rated at a moderate level, the desirable conditions, in overall, were rated at the highest level. III. The priorities of needs assessment are 1) Results of performance, 2) Morality and ethics, 3) Characteristics, 4) Modern skills, 5) Leadership skills 6) Knowledge and ability, and 7) Academic skills.
Endoscopic faces of Helicobacter Pylori infection
Authors:   Carol Davila Central Emergency Military Hospital,  Bucharest, Spulber Geanina , Mateescu Radu ,   Carol Davila Central Emergency Military Hospital,  Bucharest, Ionita Radu Florentina ,   Carol Davila Central Emergency Military Hospital, Bucharest,   Titu Maiorescu University, Faculty of Medicine, Bucharest, Jinga Mariana ,   Carol Davila Central Emergency Military Hospital, Bucharest,   Carol Davila University of Medicine and Pharmacy, Bucharest, Nuta Petrut ,   Carol Davila Central Emergency Military Hospital,  Bucharest, Costache Raluca ,   Carol Davila Central Emergency Military Hospital, Buchares,   Carol Davila University of Medicine and Pharmacy, Bucharest, Macadon Bogdan ,   Carol Davila Central Emergency Military Hospital  Bucharest, Patrasescu Mihaita ,   Carol Davila Central Emergency Military Hospital,  Bucharest, Popescu Andrada ,   Carol Davila Central Emergency Military Hospital,  Bucharest, Bucurica Sandica ,   Carol Davila Central Emergency Military Hospital, Bucharest
Published: May 2022

The infection caused by H. pylori appears secondary after a bacterial colonization of the stomach and the initial portion of the small bowel. H. pylori –infected patients can develop gastritis, peptic ulcer, stomach cancer or MALT lymphoma. H. pylori infection is defined by WHO like a type I carcinogen, its role in gastric carcinogenesis being supported by the greatest researchers. Objectives: In this study our purpose was to determine the endoscopic appearances in H. pylori infection quoted in medical literature until now and the frequency of their appearance in our group of interest. Materials and methods: In this study it was made an analytic study in which it was realized a retrospective cohort investigation at the Emergency Central Military and University Hospital “Dr. Carol Davila” Bucharest, gastroenterology branch –endoscopic department between 18.12.2012- 21.08.2013 on 1694 patients between 18 and 92 years old, with the medium age of 55 years old. As a diagnostic method for H. pylori infection we used superior digestive endoscopy during which were taken biopsies and it was made a fast urease test. Results: Regarding the variation of the endoscopic aspects at the population of study, we have found gastritis with all its aspects (which was Sidney classified) in the biggest percentage meaning 59.3% of the cases, followed with a percentage of 18.8% by those without any endoscopic abnormality, and then in 10,33% of the cases we have found peptic ulcer. With a smaller percentage, under 10%, we have found duodenitis at 8.67% of this patients, and finally the most severe lesions represented by gastric cancer and lymphoma were found at 2,7% of the H.pylori infected patients.
Evaluation of the expression level of Sine oculis homeobox homolog 1 in cervical cancer tissue in comparison with healthy adjacent tissue
Authors:   Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran, Kakavandi Ehsan , Faghihloo Ebrahim ,   Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran, Farzanehpour Mahdieh ,   Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran,   Research Center for Clinical Virology, Tehran University of Medical Sciences, Tehran, Iran, Farahmand Mohammad ,   Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran, Yaser Mehdi ,   Research Center for Clinical Virology, Tehran University of Medical Sciences, Tehran, Iran, Mokhtari-Azad Talat ,   Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
Published: May 2022

Background and Aim: This study aimed to investigate the expression level of Sine oculis homeobox homolog 1(SIX1) in normal and cancerous cervical tissues. Methods: Real-time PCR was used to evaluate SIX1 expression level in fresh surgically obtained cervical biopsies. Also, cervical specimens were tested for HPV DNA detection by MY09/11, GP5+/6+ nested PCR method. Results: The expression level of SIX1 mRNA in Cervical cancer was markedly higher than in normal cervical tissue (p<0.0001). Moreover, HPV DNA was detected in 100% of cases and 21.05% of controls (P<0.0001). Conclusions: This finding indicates that increased SIX1 expression might be of relevance to the pathogenesis of cervical cancer. Perhaps, studies to find agents that specifically target SIX1, develop novel anti-cancer and anti-metastasis drugs. This idea has to be investigated in future clinical studies.
RELATIONSHIP OF SERU M VISFATIN LEVELS WI TH SERUM ELECTROLYTES, LIVER PROFILE, HEPATIC ENZ YMES AND ANTHROPOMETRIC PARAM ETERS IN PREGNANT WO MEN WITH PREECLAMPSIA AND ECL AMPSIA DURING 3RD TR IMESTER
Authors: Asmat Shaheen  , Luqman Muhammad Waqas , Sofia Iqbal  , Nida Khan  , Sadia Fatima  , Rubina Nazli
Published: May 2022

Background: Eclampsia and preeclampsia are among the serious complications of gestation and threaten the lives of both mother and foetus. A protein called visfatin, one of these adipokines, is evaluated for its effects on serum electrolytes, lipid profile and hepatic enzymes in preeclamptic and eclamptic patients. Methods: A sum of 234 pregnant women were enrolled in this cross-sectional study and divided in to 2 main groups, i.e., Group A (eclamptic/preeclamptic) Group B (control) pregnant women respectively. Serum visfatin levels (ng/mL), serum electrolytes and liver enzymes were determined for every patient, using relative diagnostic kits. Anthropometric measurements were also noted. Results: A total of 234 women (cases; n=160, controls; n=74) with gestation age of ‰¥20 weeks participated in this study. Group A had 86 (36.75%) women with preeclampsia and 74 (31.62%) women with eclampsia whereas Group B had 74 (31.62%) normotensive pregnant women. A strong significantly positive association was recorded for systolic (R2=78.78; p-value <0.000) and diastolic blood pressure (BP) (R2=78.52; p-value <0.000). Similar result was obtained for serum sodium ions (R2=3.09; p-value <0.002) and chloride ions (R2=7.36; p-value <0.000). Alkaline phosphatases (ALP) (R2=63.47; p-value <0.000) had also shown a strong positive and statistically significant association with visfatin levels. Conclusion: Serum visfatin significantly decreased the sodium and chloride levels whereas the levels of potassium remained unaffected. A very strong and positive association of visfatin levels with levels of bilirubin and alkaline phosphatases was also observed (ALP) but it found no effect on aspartate transferases (AST).
Exploring Learners’ Autonomy in the Online Translation Class
Authors: Yansyah Yansyah , Thania Melly
Published: May 2022

Raising learners’ autonomy is demanded in today’s education. The more autonomous the learners, the better the result of the learning outcomes. This paper elaborates the findings from a case study on the development of learners’ autonomy in an online translation class. One teacher and five students were invited to be the participants to share their perspectives and experiences during the course. The data were gathered through an in-depth interview with both the teacher and learners. The findings revealed that the use of Google Classroom as a media of learning was quite effective. Most of the students became more autonomous in learning the materials, but some challenges such as late submission for the assignment, lack of motivation to learn, and some limitations of online learning still emerged during the implementation.
Use of Example Non Example Learning Model to Increase Facilities to Income Income To The Virtual Students V Sdn Kota Raden Hilir Kecamatan Amuntai Tengah Kabupaten Hulu Sungai Utara
Authors: Urahmah Nida
Published: May 2022

The ability to express the opinion of the fifth grade students of SDN Kota Raden Hilir is still not in accordance with the KKM that has been set. Therefore the researcher aims to (a) describe the increase in the ability to express opinions, (b) describe the activities of teachers and students, and (c) describe students' responses to the Example non-example learning model. This type of research is a classroom action research using qualitative methods. The research was carried out in SDN Kota Raden Hilir Kecamatan Amuntai Tengah as many as 20 class V. Based on the research results obtained (a) The learning outcomes of the first cycle students were completed 16 people (80.76%) and in the second cycle completely 20 people (100%) of the 70 determined, (b) The teacher's activities in the first cycle learning activities were declared ineffective, because the teacher had not given awards, had not involved students in concluding the material, and had not yet given homework assignments, this happened because the teacher had not manage time well. In cycle II it was declared effective, because 15 stages had been carried out optimally namely the teacher involving students in learning activities. Activity of students in the first cycle is low, in the second cycle increases, seen from the increase in learning activities, (c) Positive student responses because most students enjoy Indonesian subjects with the Example Non Example learning model strengthened from the results of the questionnaire on the Very Good choice 53,62 % and Good 28.79%.
ปัจจัยที่มีอิทธิพลต่อการพัฒนาการสื่อสารการตลาดผ่านสื่อสังคมออนไลน์ของผู้ประกอบการโอทอป ในพื้นที่เปราะบาง กรณีศึกษาจังหวัดปัตตานี
Authors: มูดอ ฮัมเดีย , อรรถอนุชิต จารียา
Published: May 2022

การพัฒนาการสื่อสารการตลาดผ่านสื่อสังคมออนไลน์มีความสำคัญที่ช่วยให้ผู้ประกอบการมีผลกำไรทั้งในสภาวะปัจจุบันและสภาวะวิกฤตโดยเฉพาะอย่างยิ่งผู้ประกอบการที่อยู่ในพื้นที่เปราะบางในสามจังหวัดชายแดนใต้ของไทย การพิจารณาถึงปัจจัยที่เกื้อหนุนเพื่อเพิ่มความมีประสิทธิภาพในการพัฒนาผู้ประกอบการนั้นเป็นสิ่งแรกที่ควรคำนึงถึง งานวิจัยนี้  มีวัตถุประสงค์เพื่อการศึกษาปัจจัยที่มีอิทธิพลต่อการพัฒนาการสื่อสารการตลาดผ่านสื่อสังคมออนไลน์ของธุรกิจโอทอป ในพื้นที่จังหวัดปัตตานี โดยการสัมภาษณ์เชิงลึกกลุ่มผู้ประกอบการธุรกิจโอทอปปัตตานี จำนวน 5 ราย ตัวแทนภาครัฐ จำนวน 3 ราย และการสำรวจความคิดเห็นของผู้ประกอบการในพื้นที่จำนวน 150 ราย ข้อค้นพบในเชิงปริมาณ พบว่า ปัจจัยที่มีอิทธิพลต่อการใช้สื่อออนไลน์ของผู้ประกอบการมี 7 ด้านได้แก่  การแลกเปลี่ยนเรียนรู้ ทักษะในการสื่อสาร ทักษะและความชำนาญในการใช้สื่อออนไลน์ ความรู้ในการใช้สื่อออนไลน์  ยุคสมัยหรือช่วงเวลา ประเภทของสินค้าที่เหมาะสมกับการใช้สื่อออนไลน์  และโอกาสในการเข้าร่วมหลักสูตรอบรมเกี่ยวกับสื่อสังคมออนไลน์ของหน่วยงานภาครัฐ ส่วนข้อค้นพบเชิงคุณภาพจากการสัมภาษณ์เชิงลึก พบว่า ในมุมมองของเจ้าหน้าที่ภาครัฐมี 10 ปัจจัยที่มีผลต่อการพัฒนาการสื่อสารการตลาดของผู้ประกอบการ ได้แก่ ความพร้อมของเครื่องมือสื่อสาร การศึกษาและความรู้พื้นฐานในการใช้เทคโนโลยี สมาชิกครอบครัวและคนใกล้ชิด เนื้อหาที่ผู้ประกอบการใช้ในการสื่อสาร การโต้ตอบของผู้ประกอบการกับลูกค้า ช่วงวัย เพศ ความสามารถในการรับรู้ข้อมูล ความคาดหวังจากรายได้และ ผู้นำที่มีความกระตือรือร้น
Aspectos socioeconómicos y culturales asociados al cultivo del cacao nativo en la comunidad originaria Umukai, Bagua, Amazonas
Authors: López Cuadra Yelka Martina , Cunias Rodriguez Marita Yanina , Coronel Izquierdo Lizbeth Milagros , Awananch Santos Joel Christian
Published: May 2022

El Perú ocupa el segundo lugar a nivel mundial como país productor y exportador de cacao orgánico. El recurso tiene significativa relevancia social por ser el sexto cultivo más importante a nivel nacional en términos del número de pobladores dedicados a la actividad. En ese sentido, el objetivo de la investigación fue determinar los aspectos socioeconómicos y culturales asociados al cultivo del cacao nativo en la comunidad originaria Umukai, distrito de Imaza, provincia Bagua, región Amazonas, el 2019. El tipo de investigación es descriptiva, cuantitativa y transeccional; los datos se obtuvieron mediante la observación sistemática y a través de la aplicación de una encuesta a los productores de cacao de la comunidad en estudio. Los resultados obtenidos muestran que el productor de cacao de Umukai, en su mayoría son del sexo masculino cuyas edades oscilan entre 30 y 39 años; presentan estudios primarios y secundarios, lo cual resulta limitante para la adopción tecnológica agraria que permita el mejoramiento de su producción. Asimismo, el cacao (Theobroma cacao L.) juega un papel económico muy importante, debido a que garantiza su sostenimiento económico. Estos comuneros utilizan la semilla criolla, sin mejoramiento, lo que implica una producción de cacao nativo. El clima, el ecosistema biodiverso y el manejo nativo permitirán que esta variedad natural, cuya demanda en los mercados globales es creciente, se consolide. Los productores son los responsables del desarrollo sostenible del cacao nativo, lo que incluye el mejoramiento de la calidad del suelo, manejo eficiente de nutrientes y la poda adecuada para mejorar la productividad. Aprendieron el cultivo del cacao por su cuenta y aún utilizan técnicas ancestrales como la minga o el cambio de fuerza; sin embargo, el uso de los jornales en la siembra y cosecha es cada vez más creciente. Las características socioeconómicas y culturales que presenta la comunidad originaria Umukai de Bagua, evidencian que el cultivo del cacao nativo representa una actividad económica fundamental de la comunidad, por tanto, deben propiciarse planes de mejoramiento, capacitación o transformación sobre el recurso para asegurar la sostenibilidad del mismo en el tiempo y la mejora de la calidad de vida en la región.
Actividad antioxidante y polifenoles de extractos de Piper sp. "matico" recolectados en el distrito de Levanto, Amazonas
Authors: Alvarado Santillán Gingler , Chavez Quintana Segundo G.
Published: May 2022

El objetivo de investigación fue determinar la actividad antioxidante y fenoles de extractos de matico (Piper sp.) en diferentes altitudes del distrito de Levanto, Amazonas. Para ello se obtuvo tres tipos de extractos (acuoso, etanólico y metanólico) de hojas recolectadas en tres altitudes distintas; luego, se determinó la actividad antioxidante utilizando la técnica DPPH (captación del radical libre 2,2-diphenyl-1-picrylhydrazyl) y cuantificó lo polifenoles totales mediante la técnica de Folin Ciocalteu. Se encontró diferencias significativas (sig.= 0,05) en la altitud y el tipo de extracto; evidenciando que a mayor altitud mayor actividad antioxidante y el mejor extracto fue el extracto acuoso frente a los extractos alcohólicos.
Desarrollo de la fase reproductiva de Lepidium meyenii ''maca'' en condiciones de Costa, Trujillo, Perú
Authors: López Medina Segundo Eloy , Mostacero León José , Gil Rivero Armando Efraín , López Zavaleta Angélica , De La Cruz Castillo Anthony J. , Villena Zapata Luigi
Published: May 2022

Lepidium meyenii “maca”, es un cultivo andino muy valorado por sus propiedades nutracéuticas, al poseer acción antioxidante, además de mejorar la fertilidad, memoria, energía, así como regular los niveles de glucosa y presión arterial. Su cultivo se restringe para la sierra de Perú teniendo un comportamiento bienal o anual, dependiendo de la altitud, necesitando la fase reproductiva un periodo de alrededor de 5 meses para culminar con la producción de semilla; además de ello, aún se desconoce su fenología reproductiva en Costa. Por ello, se propuso como objetivo de investigación, determinar el desarrollo de la fase reproductiva Lepidium meyenii “maca” en condiciones de costa. Para ello se colectaron hipocótilos del Mercado La Hermelinda, los cuales fueron seleccionados, desinfestados y cultivados en una parcela demostrativa en la Ciudad Universitaria de la Universidad Nacional de Trujillo, donde se registró los datos referentes a los días de duración de la fase reproductiva, abarcando: Emergencia, formación de pimpollo floral, floración plena y fructificación. Se concluye que la fase reproductiva de L. meyenii ''maca'' tiene una duración de 68 días en condiciones de costa, facilitando la obtención de semilla botánica en un menor tiempo, lo cual contribuirá con la instalación de semilleros a nivel de costa.
Impacto del cambio climático en la producción de café en el nor oriente Peruano
Authors: Hurtado Roxana , Chávez Quintana Segundo
Published: May 2022

La presente investigación se realizó con el propósito de determinar los impactos del cambio climático y su incidencia económica en fincas cafetaleras y de esa manera evaluar la vulnerabilidad de la producción de los cultivos de café realizando una revisión bibliográfica del impacto del cambio climático en la producción cafetalera, del Nor Oriente Peruano. Este estudio fue de enfoque cuantitativo, de nivel descriptivo. El área de estudio estuvo constituida por 3 regiones (Amazonas, Cajamarca y San Martin). Se concluye que los principales impactos del cambio climático, incide en aspectos técnicos, socioeconómicos, y ambientales, los estudios realizados sobre la influencia del cambio climático, se evidenció en el aumento de plagas y enfermedades que afectan el café. Sobre la base de lo mencionado, se nota un aumento sustancial en pérdidas económicas de la producción, la incidencia económica en fincas cafetaleras en el Nororiente Peruano a través del tiempo la mayor producción se vio reflejado en la región San Martín, Cajamarca y Amazonas. El precio en las 3 regiones oscilo entre 4, 5, 6 y 7 soles aproximadamente, en cuanto a la disminución de la producción se debió por los cambios de los factores climáticos (fenómeno del niño en el 2012 y 2016).
Caracterización fisicoquímica de los lagos de Tunants y Yahuahua, con fines de su conservación región Amazonas, Perú
Authors: Morales Rojas Eli , Díaz Ortiz Edwin Adolfo , Collazos Silva Erik Martos , Cueva Vega Edinson
Published: May 2022

El objetivo de la presente investigación fue caracterizar el agua de los lagos de las comunidades nativas, Tunants y Yahuahua, con fines de conservación del ambiente acuático. Se establecieron dos puntos de muestreo, uno por cada lago, las evaluaciones se realizaron durante los meses de diciembre, enero y febrero del 2020. Se analizaron parámetros fisicoquímicos de pH, Ce, SST, Nitratos, DBO5. Los resultados expresan un pH de 7 para ambos lagos. Con respecto a la DBO5, en el lago de Tunants la mediana se encontró en 1.8 mg/L de O2 y el lago de Yahuahua la mediana se encuentra entre 1.45 mg/L de O2. Los parámetros fisicoquímicos se encontraron dentro estándares de calidad del agua del Decreto Supremo N° 004-2017-MINAM. Categoría 4: Conservación del ambiente acuático. Sin embargo, el único parámetro que no cumplió con la norma fue los Sólidos Suspendidos Totales (SST). Finalmente, la caracterización fisicoquímica, permite dar a conocer el estado actual de los lagos para futuras decisiones en afán de conservar el ambiente acuático para su potencial uso ecoturístico.
Conocimientos ancestrales para el cuidado de la naturaleza de la comunidad nativa de Tutumberos
Authors: Huaman Tomanguilla Jhony , Terrones Campos Henrry Gari , Cuja Quiac Sebanias
Published: May 2022

El objetivo de esta investigación fue interpretar los conocimientos ancestrales para el cuidado de la naturaleza de la comunidad nativa de Tutumberos. El diseño de investigación utilizado fue el etnográfico, porque la investigación fue de enfoque cualitativo e intenta explorar e identificar conocimientos poco conocidos y estudiados en la actualidad, y que son desconocidos por la ciencia; se trabajó con la autoridad representante de la comunidad nativa (apu) que vive y conoce la realidad de las comunidades. Los resultados de los conocimientos ancestrales fue los cultivos, costumbres, tradiciones de cuidado de la naturaleza que radica en la técnica de la chacrita (cultivo debajo de los árboles), y la construcción de caminos siguiendo el curso de los árboles; confeccionan y utilizan canastas, fajas, lapas, sacados de los frutos de los árboles y que una vez usados se desintegran rápidamente en el suelo. Practican la ley de retribución a la naturaleza mediante el sembrado en las áreas deforestadas con especies nativas y exóticas. En conclusión, las comunidades nativas de Tutumberos tienen sus propias costumbres y tradiciones que se debe de dar énfasis en su difusión.
Etude de quelques paramètres de croissance et biochimiques de l’olivier (Olea europaea L.) fertilisé par une boue d’épuration
Authors: Zouari Mohamed
Published: May 2022

La présente étude montre un effet intéressant de l’enrichissement du sol avec 5% de boue d’épuration sur le comportement des jeunes plantes d’olivier. Ceci est constaté à travers une amélioration significative de la longueur de la tige principale. Par son apport en matières nutritives, la boue d’épuration (5%) a permis également une augmentation de la teneur des tissus foliaire en azote. Cependant, les doses de 10 et 15% engendrent l’augmentation de la teneur des indicateurs du stress (malondialdéhyde et perte d’électrolytes) et constituent par conséquent un signe révélateur d’un stress. Ceci pourrait être expliqué par la charge de la boue d’épuration en sels et en polluants.
Suitability of Ectomyelois ceratoniae Zeller (Lepidoptera: Pyralidae) as host for two local Trichogramma species (Hymenoptera: Trichogrammatidae) and possible implications on biological control programs
Authors: Zouba Anis , Abbes Khaled , Zougari Sahar , Benhmida Foued , Chermiti Brahim
Published: May 2022

In this study, laboratory tests were conducted to evaluate the suitability of Ectomyelois ceratoniae (Zeller) eggs as host for the development of two Trichogramma species: Trichogramma cacoeciae (Marchal) and Trichogramma bourarachae (Pintureau and Babault) (Hymenoptera: Trichogrammatidae) collected in Tunisia and reared on Ephestia kuehniella Zeller eggs. We also studied effects of five different temperature regimes (15, 20, 25, 30 and 35°C) on the biological traits of these two parasitoids. Results showed that eggs of E. ceratoniae were more suitable for the development of T. bourarachae. The number of parasitized eggs (15.46±2.04) as well as the emergence rate (95.78±5.10) was significantly higher compared to T. cacoeciae. For both Trichogramma species, the highest parasitism rate was observed at 30°C. At 35°C, the mean number of parasitized eggs (32.06±13.32) and the longevity (4.03±0.56) of T. bourarachae females were significantly higher compared to T. cacoeciae. The developmental time of both Trichogramma species was shorter at higher temperatures. The emergence rates were similar and relatively high in all tested temperature ranging from 80.48% to 97.92% for T. bourarachae and from 92.03% to 99.33% for T. cacoeciae.
Microbial richness in sandy-silty soil Tunisia and its role in arid zone fertilization
Authors: Werheni Ammeri Rim , Kloula Salma , Hassen Badennaceur
Published: May 2022

Arid zone are stressful environments, typified by alkaline soils low in organic matter, with biologically limiting extremes in water availability, temperature, and UV radiation. This study aims to analyze the microbial diversity of forest soil and its evolution considering climate change in a typical Mediterranean forest of cork oak (Quercus suber L.) and its importance in arid soil fertilization. The investigation was conducted in forest at north-western Tunisia. The study of the quality of the forest soil was based on physicochemical (pH, C, N, EC...) and microbiological (fungi and bacteria) analyses. A collection of strains has been isolated and identified morphologically (form, gram ...) and biochemically (enzymatic activity: catalase, oxidase ...). According to the results obtained, the forest soil has a pH of about 5.03 ± 0.2, C/N ratio 39.82±1.02. The count and fungi, non-filamentous and non-filamentous bacteria on solid soil show a great diversity that confers the fertility of the soil. An important number of strains of actinomycetes (45 isolates) and non-filamentous bacteria (82 isolates) showing distinctive morphological characteristics. The isolates enzymatic activity showed an important value. These obtained results give an idea on the microbe diversity that can be used in the field of bio-fertilization of poor microbial structure soils as the arid zones and oasis system.
Biochemical and physiological characterizations of Rhizobium-Pea (Pisum sativum L.) symbiotic association under abiotic constraints
Authors: Ouerghi Khadija , Bagues Mohamed , Bouaziz Sifi
Published: May 2022

Pea (Pisum sativum L.) is an important leguminous for the agricultural sector. It is a source of biological nitrogen that efficiently contributes to the soil fertility. In Tunisia, low pea production is due to bad nitrogen management, lack of phosphorus availability and to the abiotic constraints. Thus, in order  to improve the pea production ,a new farming technique involving the rhizobia inoculation was applied. The symbiotic, biochemical, physiological characterization and inoculation trials were performed in both the laboratory, greenhouse and open field. Pea Lincoln variety was used as legume species and fifteen Rhizobium strains isolated from the roots of the nodulated pea were collected from different Tunisian areas. Several physiological and biochemical parameters, i.e. pH, temperature, calcium carbonate and salinity were assessed to characterize the strains nodulating pea. All the rhizobia tests were evaluated on Yeast Extract Mannitol Agar medium (YEMA). Pea nodulation and Gallery API test were carried out under controlled conditions. Significant differences (p<0.01) between the nodules number induced by the different bacterial strains and between strains for the dry matter quantities of aerial and root parts were registered. The pH medium test results showed that among 15 strains only 8 strains having a halo diameter greater than 1 cm at basic pH. The most of isolates are able to grow at both low and high temperatures. The limestone test results qualify these rhizobia as calcifuges. Gallery API test results showed a great diversity of rhizobia assimilation of carbohydrates implying genetic diversity. Our results us to select the most efficient solubilizer Rhizobium strains nodulating pea. In order to confirm the previously cited notions on the diversity of  Rhizobium strains isolated from Pisum sativum roots in Tunisia, inoculation trial with both selected strains in controlled and open field conditions confirmed the capacity of selected strains to fix atmospheric nitrogen and promote plant growth.
Comparative analysis of responses to field salinity stress in contrasting soybean accessions highlights NaCl exclusion in leaves as a key mechanism for salinity stress tolerance.
Authors: Oyebowale Musa Akanbi , Egbichi Ifeanyi Moses , Ludidi Ndiko
Published: May 2022

Salinity is one of the main limitations to legume productivity in many regions of the world and it is estimated that 50% of all arable land will become affected by salinity by 2050. The impact of field salinity on soybean performance was assessed using two soybean accessions (KCW and HMC) cultivated in salt-treated soil and non-salt treated soil. We used a 30 cm deep field system layered with 0.4 kg/m2 NaCl for the salt-treated experiment while the control field received no salt treatment. The results show that salinity reduces soybean growth and yield as evident from the reduction in the plant shoot length, stem diameter, number of branches, number of pods and seed weight. However, the reduction in these growth parameters was less pronounced in the HMC accession than the KCW accession. Furthermore, Na+ content in leaves of the HMC accession was lower than that of the KCW accession. This proved that salinity has a damaging effect on soybean growth and yield and the relative tolerance of the HMC accession is attributed in part to its ability to restrict Na+ transport to the leaves. While the study emphasizes salt exclusion as a potentially useful mechanism for salinity tolerance in soybean, it provides evidence that the HMC accession is a good genetic resource for breeding soybean varieties with improved salinity stress tolerance.
Effect of phosphorus deficiency induced in calcareous soil on plant growth, phosphorus use efficiency and acid phosphatase activity of Medicago truncatula.
Authors: Kouas Saber , Slatni Tarek , Mhadhbi Haythem , Abdelly Chedly
Published: May 2022

Calcareous soils, characterized by a higher pH, are frequent in the North West of Tunisia. Large concentrations of calcium carbonate in calcareous soils result in accumulation of high levels of bicarbonate ions, which complex with phosphate, resulting in phosphorus deficiency (induced P deficiency) for plants. The impact of calcareous soil on plant growth, photosynthetic activity and acid phosphatase activity was explored in two lines of Medicago truncatula: TN6.18 and Jemalong. Calcareous soil significantly restricted shoot growth only in Jemalong (-45 % of the control). When grown on calcareous soil, root length was stimulated, this effect being more pronounced in TN6.18. Under calcareous soil, net CO2 assimilation declined more in Jemalong (-40 % of the control) than in TN6.18 (-20 % of the control). CO2 accumulation was increased in Jemalong (+35% of the control) plants grown in calcareous soil. The acid phosphatase activity was higher in plants cultivated under calcareous soil. This increased phosphatase activity was more pronounced in TN6.18, which showed higher accumulation of Pi in shoots and roots than Jemalolng.  In the light of these results, the present study proposes acid phosphatase as a useful candidate for improving Pi acquisition and utilization under calcareous soil.
Surgical outcome and pathological findings in macular epiretinal membrane caused by neurofibromatosis type 2
Authors: Kunikata, MD, PhD Hiroshi , Nishiguchi, MD, PhD Koji M. , Watanabe, MD, PhD Mika , Nakazawa, MD, PhD Toru
Published: May 2022

We present surgical outcomes in a 10-year-old Japanese girl with neurofibromatosis type 2 (NF2)–induced epiretinal membrane (ERM). Her right eye underwent lens-sparing 27-gauge microincision vitrectomy surgery (MIVS) with ERM peeling. Decimal best-corrected visual acuity increased from 0.3 to 0.4 postoperatively. However, abnormal thickening of the macula persisted for 3 years. Staining of the extracted ERM revealed many cells positive for glial fibrillary acidic protein and nestin. Although removal of NF2-induced ERM with MIVS can improve visual acuity, the potential surgical risks require careful consideration on a case-by-case basis.
An 8-year-old with a unilateral droopy eyelid
Authors: Su, MD Maxwell G. , Waters, MD Jana , Recko, MD Matthew
Published: May 2022

An otherwise healthy 8-year-old boy was referred to Baylor Scott & White Hospital by his pediatrician for evaluation of drooping of the left upper eyelid of 6 months’ duration. The patient’s parents reported that the drooping had become worse over the preceding 6 months, with associated mild blurring of vision in the left eye. The family denied any history of trauma, drug or allergic reactions, history of malignancy, or anisocoria. The patient had never worn glasses or contact lenses. Past medical history, surgical history, and social history were noncontributory.
Plasma Preheating Technology for Ablation Studies of Hypersonic Reentry Vehicles
Authors: Odion Iyinomen Daniel
Published: May 2022

Measurements of mass ablation rates in hypersonic flows are used to calibrate computational models. A novel plasma technique for preheating axisymmetric samples of heatshield materials has been developed and applied to ablation of graphite sample through this work. The experimental probe was very similar to the European standard probe, normal to the flow. The Scanning Electron Microscope (SEM) was used to examine the surface characteristics; and the experiments show a significant spatial variation in thickness loss for the graphite test material over the disc radius though the spatial variation was still largely axisymmetric. The present work does support reasonable contributions to reentries and can further be developed to validate computational models under conditions that replicate characteristics of reentry flights.
A Framework for Facilitating Holistic Interventions for Building Community Resilience to Climate Change for Sustainable Community Development
Authors: Tirivanhu Precious
Published: May 2022

The realities of climate change in Africa have led to a growing need for innovative approaches to livelihoods programming that promote resilience among rural communities for sustainable community development. Although several community resilience frameworks are emerging there is a need for practice modalities. This paper proposes a programming framework grounded in soft systems thinking that brings an understanding of the multi-dimensional and integrated nature of resilience programming. The author utilizes experiential knowledge from over a decade of rural development facilitation in Zimbabwe coupled with secondary reviews to address two key research questions: What are the critical components of a systemic programming framework for community resilience? And, how is such a framework facilitated in practice? The paper concludes by giving critical components of the systemic programming framework and recommends that the framework should be tested empirically for its components to be integrated into resilience programming in Zimbabwe.
Medicinal Plants Threatened by Undocumented Emerging Pollutants: The Sub-Saharan African Viewpoint
Authors: Baptist Nzukizi Mudumbi John , Fereche Itoba-Tombo Elie , Karabo Obed Ntwampe Seteno , Matsha Tandi
Published: May 2022

The history of medicinal plants on the African continent is huge, the oldest and probably the most diverse, for there are thousands of spoken languages, in the sub-Saharan African region, that are used during the traditional practices that utilize medicinal plants for healing purposes. However, our lines of research have exhibited a potential unprecedented threat to this remarkable history of African medicinal plants by emerging pollutants, the per- and polyfluoroalkyl substances (PFASs), which are yet to be efficiently and sufficiently reported and documented on in this region. Accordingly, this review chapter reports on sub-Saharan African medicinal plants with the aim of highlighting how undocumented PFASs, in this region, present a huge threat to the extraordinary diversity of these plants and the therapy that they have assisted the low-income populations of this region with for centuries. Thus, we recommend appropriate and regular assessments and monitoring of PFASs, particularly perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) the most studied of these substances and their substitutes, in medicinal plants of the region, for these chemicals have been scientifically proven to be associated to numerous health concerns. The region should also consider properly regulating these compounds.
The ESIPT-Steered Molecular Chameleon for Cations and Anions Based on Alizarin and Alizarin-S: A Comparative Study
Authors: Uahengo Veikko
Published: May 2022

Chemosensing properties of Alizarin (A3) and Alizarin S (AS3) towards anions and cations in acetonitrile are reported. The absorption and fluorescence properties of the two molecular entities were investigated in CH3CN. Based on the excited state intermolecular proton transfer system (ESIPT), the probes were able to collectively discriminate specific cations and anions via colorimetric observations and spectrometric activities. The investigation revealed that A3 was selective to Cu2+, Fe3+, and Fe2+, compared to Cu2+, Zn2+, Fe3+, and Ni2+ for AS3. The disagreement in spectral responses were ascribed to the strong electron withdrawing group present in AS3, hence the difference in behaviors. Moreover, the emission properties displayed by A3 and AS3 upon molar titrations with cations, were closely similar for all cations, which all nearly experienced fluorescence quenching, except for Zn2+ with A3, which exhibited fluorescence enhancement. Similarly, a two-step fluorescence effect was observed in A3 towards anions, which experienced both fluorescence quenching and enhancement, with incremental additions. The simultaneous fluorescence effects were ascribed to the deprotonation activities experienced by A3, as excess anion quantities were added. Thus, the sulfonyl electron withdrawing group had an effect on the Alizarin structure, towards the discrimination of anions and cations, both colorimetrically and fluorometrically.