Use of a biopolymer for road pavement subgrade

This paper presents an extensive series of laboratory works and a prediction model on the design of a road pavement subgrade with Xanthan Gum (XG) biopolymer. The experimental works were carried out using mixtures of conventional aggregate for road pavement construction and XG at the ratios of 0%, 1%, 2%, and 5%, by dry weight. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were conducted during the experimental works at the end of the various curing periods (4, 8, 16, and 32 days). An example of an improvement in the UCS values for a specimen with 5% XG addition tested at the end of 4-daycuring yields about a 200% increment by the end of a 32-daycuring. The CBR values of clean aggregates were found to be increased by about 300% by 5% XG addition for all curing periods applied. Furthermore, the energy absorption capacity of the aggregates was observed to be increased significantly by both XG inclusion and curing period. Moreover, scaled conjugate gradient (SCG) training algorithm-based models developed for the prediction of CBR and UCS test results displayed a very high estimation performance with the regression coefficients of R-2 = 0.967 and R-2 = 0.987, respectively. Evidently, XG biopolymer is provably of use as an alternative inclusion in road pavement subgrades constructed with conventional aggregates

Preliminary survey of nematodes associated with broadleaved trees in Izmit Forest Management Directorate, Turkey

A survey for Bursaphelenchus species was carried out in broadleaf forest sites of Izmit Forest Management Directorate. Nematodes were extracted from 128 wood samples, and 22 of them were cultured. Nematodes were identified using morphological characteristics and molecular analysis by amplifying D2-D3 LSU with primers. Only one Bursaphelenchus species, Bursaphelenchus mucronatus kolymensis, was isolated from Quercus petraea representing the first report from broadleaved tree species in Turkey. Paraphelenchus acontioides and Aphelenchoides heidelbergi were identified and presented herein as the first reports of these two species from Turkey. In addition, five Aphelenchoides species were also found and reported as Aphelenchoides sp.Duzce Universitesi [2016.02.02.447]Duzce Universitesi, Grant/Award Number: 2016.02.02.447WOS:0005819409000012-s2.0-8509291651

The Determination of Harmful Hymenoptera and Lepidoptera Species in Forest Nurseries in the Western Black Sea Region of Türkiye

Aim of the study: The aim of this study was to determine the harmful Hymenoptera and Lepidoptera species in some forest nurseries between 2021 and 2022. Area of study: The study areas were selected from forest nurseries located in the Western Black Sea Region of Turkiye. Material and methods: Visual inspections were performed on plants, then larvae and gall samples were collected by hand and photographed on host plants. Gall wasps were reared with the galls and examined by scanning electron microscopy. Collected caterpillars and sawfly larvae samples were placed with the host plant in an insect rearing cage for adult emergence under constant conditions. The oak gall wasp was also identified by molecular methods. Main results: In this study, four species of Hymenoptera and six species of Lepidoptera were determined. These are Dryocosmus kuriphilus, Diprion pini, Craesus septentrionalis, Hyphantria cunea, Euproctis chrysorrhoea, Calliteara pudibunda, Dioryctria simplicella, Phalera bucephala and Acronicta rumicis. The oak gall wasp was identified as Cynips quercusfolii with 97.87% identity. Research highlights: Amog these species, C. septentrionalis was new record for the insect fauna of the Western Black Sea Region. In addition, C. pudibunda and P. bucephala were reported for the first time from Kastamonu province.Duzce UniversityThe authors declared that this study was supported by Duzce University

Barrier effect of sternum to right ventricle dilatation appearing like letter phi "phi'' on MPI

WOS: 000442667600059PubMed: 2897557

FRACTIONAL INTEGRAL ASSOCIATED WITH SCHRODINGER OPERATOR ON VANISHING GENERALIZED MORREY SPACES

WOS: 000445366500015Let L= -Delta + V be a Schrodinger operator, where the non-negative potential V belongs to the reverse Holder class RHn/2, let b belong to a new BMO theta(rho) space, and let I-beta(L) be the fractional integral operator associated with L. In this paper, we study the boundedness of the operator I-beta(L) and its commutators [b, I-beta(L)] with b is an element of BMO theta(rho) on generalized Morrey spaces associated with Schrodinger operator M-p,phi(alpha,V) and vanishing generalized Morrey spaces associated with Schrodinger operator VMp,phi alpha,V. We find the sufficient conditions on the pair (phi(1), phi(2)) which ensures the boundedness of the operator I-beta(L) from M-p,phi 1(alpha,V) to M-q,phi 2(alpha,V) and from VMp,phi 1 alpha,V to VMq,phi 2 alpha,V, 1/p - 1/q = beta/n. When b belongs to BMO theta(rho) and (phi(1), phi(2)) satisfies some conditions, we also show that the commutator operator [b, I-beta(L)] is bounded from M-p,phi 1(alpha,V) to M-q,phi 2(alpha,V) and from VMp,phi 1 alpha,V to VMq,phi 2 alpha,V, 1/p - 1/q = beta/n.Ahi Evran University Scientific Research ProjectAhi Evran University [FEF.A3.16.023]; Presidium of Azerbaijan National Academy of ScienceAzerbaijan National Academy of Sciences (ANAS)We thank the referee(s) for careful reading the paper and useful comments. The research of A. Akbulut was partially supported by the grant of Ahi Evran University Scientific Research Project (FEF.A3.16.023). The research of M. Omarova was partially supported by the grant of Presidium of Azerbaijan National Academy of Science 2015

Some physiological and biochemical changes In oak trees after fire

Background: Forest fires are considered integral parts of many forest ecosystems despite being a disaster influencing the forest ecosystem dynamics significantly. A fire that occurred within the borders of Duzce-Konuralp State Forest Enterprise affected 16 ha of oak forest. The present study aimed to investigate the physiological and biochemical changes in two oak species (Quercus pubescens and Q. cerris) at post-fire period. For this purpose, seasonal shoot and leaf samples were collected from 15 trees (5 trees from high and low fire intensity and control groups) for each oak species. The samples were subjected to xylem, water potential, and stomatal conductivity analysis in the field and carbohydrate concentration and proline analyses in the laboratory. Results: It was found that leaf surface area decreased, and the root-leaf water connection was broken depending on the intensity of the fire. As the fire severity increased, water potential and stomatal conductivity of trees increased; proline and carbohydrate concentration amounts decreased. Q. pubescens had lower water potential and stomatal conductivity than Q. cerris but higher proline and carbohydrate concentration amounts. Conclusion: Q. pubescens was more resistant to drought stress during the post-fire season than Q. cerris from the aspect of physiological and biochemical characteristics.Duzce University [2016.02.02.413]Duzce University, Research Fund Project Number 2016.02.02.41