Width Diameter Research Articles

Effective Conductivity of Carbon-Nanotube-Filled Systems by Interfacial Conductivity to Optimize Breast Cancer Cell Sensors.

Interfacial conductivity and “Lc”, i.e., the least carbon-nanotube (CNT) length required for the operative transfer of CNT conductivity to the insulated medium, were used to establish the most effective CNT concentration and portion of CNTs needed for a network structure in polymer CNT nanocomposites (PCNT). The mentioned parameters and tunneling effect define the effective conductivity of PCNT. The impact of the parameters on the beginning of percolation, the net concentration, and the effective conductivity of PCNT was investigated and the outputs were explained. Moreover, the calculations of the beginning of percolation and the conductivity demonstrate that the experimental results and the developed equations are in acceptable agreement. A small “Lc” and high interfacial conductivity affect the beginning of percolation, the fraction of networked CNTs, and the effective conductivity. Additionally, a low tunneling resistivity, a wide contact diameter, and small tunnels produce a highly effective conductivity. The developed model can be used to optimize breast cancer cell sensors.

Effective Charged Exterior Surfaces for Enhanced Ionic Diffusion through Nanopores under Salt Gradients.

High-performance osmotic energy conversion requires both large ionic throughput and high ionic selectivity, which can be significantly promoted by exterior surface charges simultaneously, especially for short nanopores. Here, we investigate the enhancement of ionic diffusion by charged exterior surfaces under various conditions and explore corresponding effective charged areas. From simulations, ionic diffusion is promoted more significantly by exterior surface charges through nanopores with a shorter length, wider diameter, and larger surface charge density or under higher salt gradients. Effective widths of the charged ring regions near nanopores are reversely proportional to the pore length and linearly dependent on the pore diameter, salt gradient, and surface charge density. Due to the important role of effective charged areas in the propagation of ionic diffusion through single nanopores to cases with porous membranes, our results may provide useful guidance to the design and fabrication of porous membranes for practical high-performance osmotic energy harvesting.

Survival Rate of Ultrawide Diameter Implants Placed into Molar Postextraction Sockets and in Function for Up to 144 Months.

Innovations in macroimplant design, specifically ultrawide implants 7.0 mm or greater in diameter, have allowed immediate molar replacement. This is a retrospective study assessing the survival rates of ultrawide diameter implants (7.0, 8.0, 9.0 mm) immediately placed into molar extraction sockets. Implants were followed up to 144 months postplacement. A retrospective study was conducted of all patients treated in a private surgical practice between January 1, 2008 and December 31, 2020, who received ultrawide dental implants (7.0, 8,0, 9.0 mm.) placed immediately into molar extraction sockets. Wide diameter healing abutments were placed on all implants at the time of surgery. Abutments and crown restorations were fabricated after at least 4 months of unloaded healing. Patient age, sex, implant location and implant diameters were examined for survival. Insertion torque values at the time of placement and time in function were also evaluated. Biometric statistics were computed with p-values (<0.05. Descriptive and bivariate statistics were computed;p-values were set at 0.05. Five hundred forty-four patients (225 males; 319 females) average age 62.5 years (range 27 to 95) had 563 implants placed. Five hundred thirty-five of five hundred sixty-three (535/563) implants survived; 28 failed [clinical survival rate (CSR) 95.03%]. Number and time in function were: 0 to 12 years 100%; 0 to 9 years 85%; 0 to 6 years 69%; 0 to 3 years 35% or 10 to 12 years 16%; 7 to 9 years 16%; 4 to 6 years 34%; 0 to 3 years 35%. No significant differences were found between sex and implant failures (p = 0.22). Maxillary (266/285; 93.3%) and mandibular (269/278; 96.8%) implant CSRs were not significantly different. Three implant diameters were used: 7.0 mm (206/563) [36.6%]; 8.0 mm (267/563) [47.4%]; 9.0 mm (90/563) [15.9%]. Clinical survival rates were: 7.0 mm (201/206) [97.6%]; 8.0 mm (252/267) [94.4%]; 9.0 mm (82/90) [91.1%]. Mean age for patients with failed implants did not show any significant differences (p = 0.1398). Fifteen of the 28 failed implants failed within 120 days of surgical placement (prior to definitive restoration; [53.6%]; 4 implants failed between 4 and 12 months [14.3%]; 9 implants failed at least 1-year postloading [32.1%]. The results of this long-term retrospective study regarding ultrawide diameter implants suggested that these implants were viable treatment options for immediate molar replacement following tooth extraction in either jaw with an unloaded healing protocol. High clinical survival rates were reported over a 144-month (12-year) timeframe.

Comparison of bone loss around implants using radiographs

This article presents an original-research conducted at Pushpagiri College of Dental sciences, Thiruvalla, Kerala to compare and evaluate the vertical crestal bone changes around implants with different surface coatings and diame-ter using CBCT and RVG taken at the time of loading and one year after loading. Thirty-six samples were divided in 4 group; based on 3 parameters: implant surface coating, implant diameter, and single versus multiple implants sup-ported bridges. Length of all implants is kept standardised at 10 mm. Data were statistically analyzed by Students paired t-test and comparison between CBCT and RVG is done using interclass correlation test. The mean crestal bone loss has increased statistically significant from the time of loading and after one year of loading. The average crestal bone loss on single implants were less compared to multiple implants supported bridges at both timings. CBCT shows more accurate and reliable values than RVG both clinically and statistically. It was concluded that crestal bone loss was less among single implants with calcium phosphate surface coating and wider diameter than alumina blasted and narrow diameter implants. Single implant shows less bone loss than multiple implants. The CBCT shows a reliable method of detecting circumferential peri-implant bone defects than RVG.

NEURODEGENERATION, MICROVASCULAR DYSFUNCTION AND THEIR INTERACTION: ASSOCIATIONS WITH COGNITIVE PERFORMANCE – THE MAASTRICHT STUDY

Objective: The main objective was to investigate whether there was an interaction between retinal nerve fibre layer (RNFL) thickness, an index of neurodegeneration, and retinal venular diameter, an index of microvascular dysfunction, in the associations of RNFL thickness and retinal venular diameter with global cognitive performance, an index of cognitive function. Design and method: We used cross-sectional data from The Maastricht Study (n = 1,785 participants, 47.8% men, mean age 59 years, and 24.5% with type 2 diabetes [oversampled by design]) and tested for an interaction between RNFL thickness and retinal venular diameter in the non-linear associations of RNFL thickness and retinal venular diameter with global cognitive performance. RNFL thickness was defined as low (lowest quartile) and high (highest three quartiles combined). Retinal venular diameter was defined as wide (highest quartile) and narrow (lowest three quartiles combined). All associations were adjusted for potential confounders (demographic variables and cardiovascular risk factors). In addition, we tested for interaction by hypertension. Results: The association of RNFL thickness with global cognitive performance was modified by retinal venular diameter (Pinteraction = 0.02) and the association of retinal venular diameter with global cognitive performance was modified by RNFL thickness (Pinteraction = 0.02). After full adjustment, low versus high RNFL thickness was associated with lower global cognitive performance in individuals with, but not in individuals without, a wide retinal venular diameter (beta, [95% confidence interval] low versus high RNFL thickness, -0.26 [-0.43; -0.08] versus -0.03 [-0.14; 0.08], respectively); and wide versus narrow retinal venular diameter was associated with lower global cognitive performance in individuals with, but not in individuals without, a low RNFL thickness (-0.27 [-0.47; -0.06] versus 0.01 [-0.11; 0.12], respectively). Hypertension modified the above associations. In stratified analyses, the above associations were stronger in individuals with, versus without, hypertension. Conclusions: In summary, the present population-based study found an interaction between neurodegeneration, estimated from RNFL thickness, and microvascular dysfunction, estimated from retinal venular diameter, in the associations of RNFL thickness and retinal venular diameter with global cognitive performance. Hence, the interaction between neurodegeneration and microvascular dysfunction may contribute to the pathobiology of cognitive dysfunction.

A gross anatomical study of the styloid process of the temporal bone in Japanese cadavers.

The incidence of an elongated styloid process (SP) and average length and diameter of SP have not been reported using Japanese cadavers. Data on the female-to-male ratio of an elongated SP vary. We calculated the average length and diameter of SP in Japanese cadavers and compared SP lengths between sexes. Twenty-seven sides (right and left of bodies) in males and 51 sides in females were analysed. Measurements were obtained from the inferior external acoustic meatus to the distal tip of the SP. SP diameters at the proximal base, midpoint, and distal tip were measured. SP > 30 mm was considered elongated. We used Welch's t-test for the statistical analysis. Fisher's exact two-tailed test was also performed to analyse the female-to-male elongation ratio. A p-value < 0.05 was considered statistically significant. Styloid process elongation prevalence was 29.5% in our sample. The average full length was 27.04 ± 7.88 mm overall; the average diameters were 5.41 ± 1.77 mm at the proximal base and 2.21 ± 1.22 mm at the distal tip. The average SP measurement was 26.81 ± 5.92 mm in males and 27.16 ± 8.79 mm in females (p = 0.74). The female-to-male ratio of SP elongation was 1:2 (p = 0.041). Females had longer full lengths of non-elongated SPs than males (p = 0.004). Males had wider diameters at the proximal base of elongated SPs than females (p = 0.017). The average length of SP was 27.04 mm in the Japanese population and about 30% of the Japanese presented SP ≥ 30 mm. Male had significantly higher rate than female among the SP ≥ 30 mm, and female had significantly longer SPs than male among the SP < 30 mm. Anatomically, the SP gets narrow as distally goes. Our anatomical findings would be beneficial to creating treatment plans, diagnosis, and surgery.

Study of genetic divergence among Eucalyptus tereticornis clones through principal component analysis (PCA)

Eucalyptus tereticornis is one of the fastest growing multipurpose tree species. It is planted extensively under agroforestry and farm forestry. It was needed to estimate the genetic variability and contribution of yield contributing traits towards the total divergence. The PCA summarizes variability present in studied traits into utilizable form and to practical importance. Therefore, in the present study, eight clones of E. tereticornis were studied under field trial for their growth performance and contribution of individual traits towards total divergence were estimated. The eigene value of all three vectors (PCs) were found greater than one, which revealed that all the principal components explained a significant amount of variability present in traits. The proportion of variability explained by PC1 was 48.15 percent, by PC2 was 38.09 percent and by PC3 was 5.75 percent, all together these three vectors explained 92 percent of total variability. In PC1 and PC2, Plant height, biomass, leaf area, number of leaves, number of branches, leaf width and collar diameter were contributed positively towards the divergence hence the selection based on these traits will be rewarding. The times ranked contribution study also confirmed the contribution of L/W ratio (35.71%) and biomass (14.29%) towards the divergence. These traits are very important for the selection of parents in hybridization programs and effective selection of productive clones.

Assessment of the risks of changes in brachiocephalic vessels according to ultrasound examination of patients with obstructive sleep apnea

Introduction. In the medical literature, there is not enough work on the impact of obstructive sleep apnea (OSA) on the development of atherosclerosis of the brachiocephalic arteries and venous dysgemenia. For the purpose of early diagnosis of vascular complications, further study of extracranial vessels in patients with OSA is necessary.Aim. To study the chances of changes in brachiocephalic vessels by ultrasound examination in patients with obstructive sleep apnea.Materials and methods. A survey was carried out of 88 patients. The results of anthropompetry, polysomnography and ultrasound examination of brachiocephalic vessels were evaluated.Results and discussion. New data were obtained on the severity of macroangiopathy, an increase in the peak systolic blood flow velocity in the internal jugular veins, and an increase in the diameters of the vertebral veins in patients with sleep apnea. It was also found that in patients with OSA, the chances of having a wide diameter of the common carotid artery (CCA) on both sides and the internal carotid artery on the left are more than 3 times higher, the probability of thickening of the intima-media complex in the area of the CCA and its bifurcation is more than on the left 3.5 times and the chances of macroangiopathy are 3 times higher in comparison with the examined patients without apnea.Conclusion. Timely assessment of the entire spectrum of pathological changes in the brachiocephalic vessels in patients with OSA will make it possible to diagnose early signs of atherosclerotic lesions of the arteries, venous dysfunction at the extracranial level.

Stability of short and long dental implants placed at different levels

Purpose. The purpose of the study was to evaluate the stability during healing and before loading of implants placed at different levels depending on the texture of their neck.Materials and methods. The study included patients with the same type of bone (type II), who were implanted with screw implants with a conical connection: – parallel walls (polished collar – 0.3 mm), installed at the level of the alveolar ridge without immersion (group A); – root-shaped with micro-thread in the collar area, set below the level of the alveolar ridge by 1 mm (group B); – root-shaped (polished collar – 0.75 mm), installed above the level of the alveolar ridge by 1 mm (group B).All implants were used with shapers. The values of the implant stability coefficient (ISQ) were determined using resonance frequency analysis immediately after implant placement during surgery and 1, 4, 8 and 12 weeks after it. Other evaluated stability factors are the diameter and length of the implant, the place of their installation (upper or lower jaw).Results. A total of 60 implants were evaluated (20 in each group). Mean ISQ values at baseline on the day of surgery and 1 week after insertion were significantly higher in group B (p=0.006, p=0.022 and p=0.031, respectively, for groups B, C, A). There were no differences at subsequent observation points. The ISQ value was higher for wide (diameter – 4.3 mm) implants than with a smaller diameter value (3.5 mm) and for mandibular implants than for maxillary implants at all points of observation. Neglecting the diameter data, the length of the implant did not affect the ISQ values.Conclusion. Inserting the implant deeper into the bone may only matter for primary stability. Moreover, the diameter of the implant and its location affect the primary and secondary stability before loading, while the length of the implant does not play an important role if the diameter is not taken into account.

Phenotype correlation analysis and excellent germplasm screening of herb Bletilla Rchb. f. based on comprehensive evaluation from thirty-three geographic populations

BackgroundThe Bletilla genus of Orchidaceae includes plants with great economic value, among which B. striata is the main traditional medicinal plant, and its pseudobulb, known as BaiJi, was first recorded in Shennong’s Classic of Materia Medica. However, there has been little systemic evaluation of the germplasm quality of Bletilla plants in China. In order to comprehensive evaluate the Bletilla resources in China and screen out the candidate phenotypic traits determining yield and/or quality of Bletilla, the variation of phenotypic indicators (pseudobulb, leaf, stem, inflorescence, flower) and active ingredients contents (polysaccharide, total phenolics and militarine) in different populations of B. striata and B. ochracea were investigated through 4 years’ common-garden experiment.ResultsThere were abundant phenotypic variations and significant differences among different populations in the morphological phenotypes, pseudobulb weight and main active ingredient contents. AHBZ, HBLT and HBSN populations showed good prospects for industrial development, presenting higher quality in terms of yield and main active ingredient content. Pseudobulb yield, polysaccharide and total phenol content are positively correlated with phenotypic traits. Militarine content is negatively correlated with almost all indexes. Plant height, leaf width and stem diameter may be important indicators of potential excellent germplasms.ConclusionsBletilla is not strictly geoauthentic medicinal plants. B. ochracea could be accepted as an alternative resource to B. striata. The best harvest period of Bletilla is the third year after cultivation. Plant height, leaf width and stem diameter may be important indicators of potential excellent germplasms. These results provide important information required for the efficient screening and utilization of Bletilla germplasm resources.

Advanced modelling of adsorption process on activated carbon

To gain a deeper insight into the adsorption kinetics mechanism, the adsorption of p-chlorophenol (PCP) from water, cyclohexane, and heptane on surface chemistry modified activated carbons was modeled by the general rate (GR) differential mass transport model, which takes into account external and internal mass transfer resistance. Due to the fact that the particles of AC are characterized by a wide particle size distribution (PSD) and pore diameter distribution (PDD), which are usually not considered for the simulation, our experimental dates were modeled with the GR model, in which PSD and PDD were included. It was found that, for organic phases, mainly the slow surface adsorption–desorption process controls mass transfer. In the case of water, the mass transfer was controlled by molecular diffusion in pores or by slow surface adsorption depending on AC. It was also shown that neglecting the PSD can lead to errors in the evaluation of the values of the adsorption model parameters, whereas, on the other hand, the pore diameter distribution can be successively approximated by average pore diameter.

Stress Reactivity, Susceptibility to Hypertension, and Differential Expression of Genes in Hypertensive Compared to Normotensive Patients.

Although half of hypertensive patients have hypertensive parents, known hypertension-related human loci identified by genome-wide analysis explain only 3% of hypertension heredity. Therefore, mainstream transcriptome profiling of hypertensive subjects addresses differentially expressed genes (DEGs) specific to gender, age, and comorbidities in accordance with predictive preventive personalized participatory medicine treating patients according to their symptoms, individual lifestyle, and genetic background. Within this mainstream paradigm, here, we determined whether, among the known hypertension-related DEGs that we could find, there is any genome-wide hypertension theranostic molecular marker applicable to everyone, everywhere, anytime. Therefore, we sequenced the hippocampal transcriptome of tame and aggressive rats, corresponding to low and high stress reactivity, an increase of which raises hypertensive risk; we identified stress-reactivity-related rat DEGs and compared them with their known homologous hypertension-related animal DEGs. This yielded significant correlations between stress reactivity-related and hypertension-related fold changes (log2 values) of these DEG homologs. We found principal components, PC1 and PC2, corresponding to a half-difference and half-sum of these log2 values. Using the DEGs of hypertensive versus normotensive patients (as the control), we verified the correlations and principal components. This analysis highlighted downregulation of β-protocadherins and hemoglobin as whole-genome hypertension theranostic molecular markers associated with a wide vascular inner diameter and low blood viscosity, respectively.

Pedicle Morphometry of Subaxial Cervical Spine Using Computed Tomography Scans among Adult Ugandan Subpopulation.

Background Accurate placement of pedicle screws in the subaxial cervical spine requires precise understanding of vertebra anatomy. Little is known about the morphometric characteristics of the subaxial cervical pedicle in the Ugandan population. The objective of the study was to determine the morphometric dimensions of pedicles in the subaxial cervical spine among the adult Ugandan population. Methods We conducted a cross-sectional study from March to November 2019 among adult Ugandans with a normal cervical CT scan at Nsambya hospital in Kampala. Eligible participants were consecutively recruited into the study. Data on baseline characteristics and pedicle dimensions from the CT scan finding was collected using a structured questionnaire. Data was analysed using Stata 13.0. Pedicle dimensions for the different levels of subaxial cervical vertebrae were summarised as means and standard deviations, the Mann–Whitney test was used to compare pedicle dimensions for the different vertebra levels among females and males on both right and left sides, and the level of significance was set at 0.05. Results A total of 700 subaxial cervical pedicles (C3-C7) from 49 males and 21 female participants were studied. Pedicle width diameter showed cephalocaudal gradual increment from C3 1.65(0.63) mm to 3.46(0.75) mm at C7. Pedicle height also showed an increase caudally with smallest diameter at C3 (1.98(0.76) mm) and largest at C5 in females (3.67(6.42) mm) and at C7 in males (3.83(0.76) mm). The pedicle height was wider than the pedicle width at all levels. The pedicle chord length gradually increased caudally in both sexes ranging from 29.08(1.35) mm at C3 to 32.53(3.19) mm at C7. The axial angles were oriented medially and showed no consistent trend ranging between 50° and 53°. The sagittal angles decreased as one moved from C3 to C7. The dimensions of females were significantly smaller than in males. Conclusion Pedicle endosteal width was smaller than pedicle height dimensions at all levels. Pedicle cord length increased caudally. The pedicle dimensions, except angulations, were smaller in females than in males.

Changes in the parameters of intra-tumor and remotely located microvessels during the growth of glioblastoma implanted in the brain of rats.

The morphological method was used to study the structural characteristics of intracellular and remotely located microvessels during the growth of glioblastoma implanted in the right hemisphere of the rat brain. The studies were carried out for 6 hours to 18 days after the implantation of the tumor. An increase in the proportion (in %) of microvessels with a wide diameter was recorded both in the tumor itself and in remote areas of the tissue of both hemispheres of the brain. A similar trend of changes took place in the dynamics of microvascular areas on sections of the ear of rats that do not have a common blood circulation with the brain. The data obtained make it possible to justify the expediency of further identification of remote tests to assess the parameters of the tumor and the therapeutic measures being developed.&#x0D; Key words: glioblastoma, morphometry, diameter of microvessels.&#x0D;

On the road toward highly efficient and large volume three-dimensional-printed liquid chromatography columns?

The current performance of commercially packed liquid chromatography columns is limited by the random structure of the packed bed and by the wall-to-center heterogeneity of its structure. The minimum reduced plate heights observed are not smaller than 1.4, whereas they could theoretically be as low as 0.1 for dense and perfectly ordered packings of spheres. To bridge this gap, a wide inner diameter column with an ordered macroporous structure is printed in three dimensions by stereolithography of poly(ethylene glycol diacrylate) resin. Feature sizes below 100μm are achieved by combining conventional polymer stereolithography with photolithography using photomasks. A layer-by-layer polymerization is performed by alternating two distinct photomasks having horizontally and vertically oriented patterns. Despite the inevitable printing imperfections, minimum reduced plate heights around unity are measured for nonretained analytes. The next challenges for the successful printing of highly efficient and large volume liquid chromatography columns are threefold: reducing the feature size down to below 10μm, keeping minimum the unevenness of the flow channel dimensions, and tackling additive manufacturing of silica aerogels at such small feature sizes for higher mechanical stability and broader range of retention/selectivity than those delivered by polymer materials.

SIMULATION STUDY OF BREAKUP AND ATOMIZATION CHARACTERISTICS OF GASOLINE-ETHANOL (GASHOLS) FUEL BLENDS

To meet the increasingly stringent constraints on mobile and point emissions in the wake of the dwindling fortunes of fossil fuels, evaluation of hybrid fuels for application in combustion engines has become an imperative, especially in the third world countries. This paper presents, modeling of atomization characteristics of gasoline-ethanol fuel blends. Fuel breakup models and correlations between flow patterns and droplet characteristics were adopted and implemented in OpenFOAM Computational Fluid Dynamics (CFD) modeling suite for direct gasoline injector using a simple cylindrical mesh structure at constant volume. The Rosin Rammler distribution model was used to generate the number of spray particles injected into the cylinder. The spray modeling and atomization employed the use of blob sheet model and Kelvin-Helmholtz-Rayleigh-Taylor (KH-RT) model while the numerical technique for simulating atomization process by CFD included the use of governing equations such as Eulerian for gas phase, Lagrangian for disperse phase and turbulence modeling. The effects of fuel blends, injection pressure, ambient gas pressure and spray cone angle were evaluated on the axial spray tip penetration, spray width, and overall Sauter Mean Diameter (SMD). The SMD was seen to be affected by varying the degree of injection cone angle. The spray tip penetration lengths were larger for higher injection cone angles while higher penetration lengths were obtained at higher injection pressures. One salient conclusion drawn from the modeling is that as the number of particle increased, the density of clusters became smaller.

Preparation of Ti Material Supported SBA-15 Functionalized with Sulfonic Acid Environmental Friendly Catalyst: Application for Esterification Process

Kinetics of catalytic esterification between propionic acid and n-butanol has been studied in a batch reactor by using a Ti-supported SBA-15 catalyst with sulfonic acid. The synthesized catalyst is used to test the efficacy of catalyst for esterification reaction. The SBA-15 acidity is tied to incorporation of Ti and -SO3H groups through and the use of Si/Ti with Si/S molar ratios. The results are mesoporous materials with a typical hexagonal structure of the Ti SBA-15 and wide areas and high pore diameters that are operated with sulfonic groups. The addition of SBA to Ti leads mainly to catalytic materials with Bronsted and Lewis acid sites. Ti SBA-15 is the most effective catalyst for sulfonic acid, with the highest consents of Lewis acid sites and deactivation resistance and low hydrophilicity. The effect of temperature, catalyst amount, and molar ratio on reaction kinetics has been studied. The conversion of propionic acid is found to be 91% at 115°C at a 2 : 1 ratio of n-butanol to propionic acid molars with 2% of sulfonic acid supported Ti SBA-15. The Eley-Rideal kinetic model is used to fit the experimental data. The activation energy and kinetic factor are found to be 29.63 kJ mol–1 and k o 0.549 L2 g-1 mol-1, respectively.

Analyses of Xylem Vessel Size on Grapevine Cultivars and Relationship with Incidence of Esca Disease, a Threat to Grape Quality

Esca disease is one of the most important grapevine trunk diseases. It seriously reduces the quality and quantity of grapevine production, and results in a shorter vineyard lifespan. Previous studies have suggested that wide xylem vessel diameter favours development on grapevine of Phaeomoniella chlamydospora, one of the fungi involved in esca, thus affecting disease susceptibility. In this study, cultivars mainly originated from European countries, 27 white-berried and 24 red-berried grapevine cultivars, were grown in the same experimental vineyard and were analysed for xylem vessel sizes (as diameter and frequency) for correlation with esca incidence. In this study, the cultivars showed significant differences in the xylem vessel parameters. However, no relationship was detected between vessel size and esca incidence in the field. Overall, white-berried cultivars showed wider vessel diameters than red-berried cultivars. The relationship between xylem vessel size in the red-berried and white-berried cultivars and incidence of esca symptoms is discussed. We suggest that vessel anatomy profiles can provide useful information for further investigations on grapevine genotype structure–esca incidence relationships.

Дифференциация климатипов лиственниц (Larix spp.) в географических культурах в лесостепи Средней Сибири

Дифференциация климатипов лиственниц (Larix spp.) в географических культурах в лесостепи Средней Сибири

IMPACT OF REGIONAL DISTRIBUTION AND AIR POLLUTION ON INTERNAL STRUCTURE OF MELIA AZEDARACH L. LEAVES

This study was performed to investigate the impact of air pollution on leaf area and anatomical features of Melia azedarach L. trees, in urban areas with three demographical classes: location (I) industrial area, location (II) roadside area and free parts (control area) as a location (III) of Duhok city/Kurdistan Region-Iraq, during July 2021. The results demonstrated that the leaf area of selected plants' leaves in location I had reduced with no noticeable change in the average stomata density in the three locations I, II and Ⅲ. Meanwhile, the results of the most anatomical features of the blade (blade, lower cuticle, epidermis (both upper and lower) thickness, palisade layer height and spongy parenchyma width) in addition to midrib parameters (epidermis thickness (upper and lower), collenchyma and parenchyma layer width, phloem and xylem width and pith diameter) were decreased in both locations I, II, and with well-developed anatomical features in location III.