Ambrosia artemisifolia (ragweed) is an invasive plant species with severe allergenic effects which quickly detects favorable growth conditions and represents a threat to the quality of plant communities. There are still unanswered questions to the allelopathic effects of ragweed on other species, which further complicates the understanding of its compatibility with other plants in both natural and agricultural environment. The paper monitors the allelopathic effects of the aqueous extract isolated from dry ragweed leaves (10, 5, 2.5 and 1.25%) on the germination and growth of corn and wheat. The aquaeous ragweed extracts reduced the germination of corn and wheat down to 70%. The seedling length was inhibited, especially in high concentrations. Wheat appeared to be more tolerant to the extract effect. Corn suffered a larger inhibition effect in terms of root length and seedlings, which suggested that this species was more sensitive. The obtained results imply that the ragweed should be combated in a timely manner in order to avoid its inhibitory effects on the indicator crops.

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Autoritet je ključno profesionalno i osobno obilježje nastavnika. Nastavnik treba znati upravljati i voditi razredne i školske aktivnosti, biti stručnjak iz nastavnoga predmeta koji poučava, koristiti primjerene metode poučavanja, iskazivati razumijevanje prema svakom učeniku, a pritom imati i pozitivan utjecaj na učenike. U suvremenoj se pedagoškoj literaturi taj pojam sve rjeđe koristi. Promjene u odgoju i obrazovanju koje naglašavaju autonomiju učenika i stvaranje pogodnoga ozračja za učenje dovele su do narušavanja autoriteta nastavnika u razredu.Cilj je rada razmotriti stavove studenata pedagogije o autoritetu nastavnika u suvremenom pristupu odgoju i obrazovanju, otkriti njegove karakteristike i eventualne promjene tradicionalnoga shvaćanja autoriteta. U istraživanju su sudjelovali studenti pedagogije, a provedeno je  upitnikom otvorenoga tipa u kojemu su studenti iskazivali mišljenje o autoritetu nastavnika u učionici, obilježjima i značenju autoriteta. Rezultati su pokazali da studenti pedagogije autoritet nastavnika povezuju s tradicionalnim oblikom autoriteta, dajući mu  obilježja relacijskoga autoriteta, tj. u velikoj ga mjeri povezuju s odnosom nastavnika i učenika.

Water is an important component in every plant’s life helping them to perform basic metabolic processes. The biggest challenge of today’s agriculture is how to ensure sufficient water needs at the key phase of plant development and how they can use the available moisture in the soil through the rhizosphere system.

BACKGROUND: Psychological support for patients and their families is of great importance at times when they go through shock, stress, and fear at moments when confronted with diagnosis and treatment. AIM: Aim to this study was to examine the influence of family attitudes on psychosocial adaptation and the effect of treatment of patients with malignancies to preserve the integrity of the diseased person in Bosnia and Herzegovina. METHODS: The cross-sectional study included 100 patients who were hospitalized at Foca University Hospital, Department of Oncology between September 2019 and December 2019. The survey used a sociodemographic questionnaire as well as a standardized questionnaire to evaluate communication with patients with malignant diseases for the patient and family (CCAT-PF). RESULTS: More than half of the respondents (69%) accepted the malignancy. When it comes to communication between health-care professionals and patients, 51% are satisfied with the communication and 49% are not satisfied. Most respondents (62%) hesitate to talk about side effects during treatment with health-care professionals, with a statistically significant difference observed between male and female respondents (χ2 = 6,014; p = 0.014). CONCLUSION: The time devoted to the subjects by the physicians as well as the willingness to listen to the patient is important aspects that influence the adaptation of the disease as well as the treatment.

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION Association between human cytomegalovirus and periodontitis: A systematic review and meta-analysis. Botero JE, Rodríguez-Medina C, Jaramillo-Echeverry A, Contreras A. J Periodontal Res. 2020;55(4):551-558. SOURCE OF FUNDING Information not available TYPE OF STUDY/DESIGN: Systematic review with meta-analysis of data.

ABSTRACT This paper outlines the roles of gross domestic spending on research and development (R&D) and gross capital formation in the innovation process and detects their contribution to this improvement. The analysis is conducted for Turkey for the period 1990-2017 using annual time-series data. Our findings suggest a bidirectional causal link between all variables of interest and prove that R&D can be a significant driving force for the Turkish innovation process. Most of the research and development activities in Turkey have been performed by universities. Herein, it is of key importance for the Turkish government to increase public expenditure, especially on education, since human capital plays an important role in building innovation capacity.

Compared to the traditional industrial robots that use rigid actuators, the advanced robotic systems are mobile and physically interact with unknown and dynamic environments. Therefore, they need intrinsically safe and compact actuators. In the last two decades, Series Elastic Actuators (SEAs) have been one of the most popular compliant actuators in advanced robotic applications due to their intrinsically safe and compact mechanical structures. The mobility and functionality of the advanced robotic systems are highly related to the torque-density of their actuators. For example, the amount of assistance an exoskeleton robot can provide is determined by the trade-off between the weight and output-torque, i.e., torque-density, of its actuators. As the torque outputs of the actuators are increased, the exoskeleton can expand its capacity yet it generally becomes heavier and bulkier. This has significant impact on the mobility of the advanced robotic systems. Therefore, it is essential to design light-weight actuators which can provide high-output torque. However, this still remains a big challenge in engineering. To this end, this paper proposes a high-torque density SEA for physical robot environment interaction (p-REI) applications. The continuous (peak) output-torque of the proposed compliant actuator is 147Nm (467 Nm) and its weight is less than 2.5kg. It is shown that the weight can be lessened to 1.74, but it comes at cost. The performance of the proposed compliant actuator is experimentally verified.

The paper introduces a novel control strategy for simultaneous control of position and interaction force for multi-degrees of freedom robotic systems (multi-DOF). The strategy enables both position control in free motion, and interaction force control during contact with an environment. In that sense, it differs from classical control algorithms which are switching between two different controllers, namely, position controller and force controller. The transition between position control mode and force control mode in the newly proposed structure is smooth, removing oscillations often present in the classical algorithms. This improves safety of the interaction between a controlled system and its environment.