Experimental Investigation on the Self-Healing Efficiency of Araldite 2011 Adhesive Reinforced with Thermoplastic Microparticles

Newly developed self-healing technologies allow self-repair of adhesively bonded joints without the need for replacing the damaged joint with a new one. This study addresses to define experimentally the self-healing ability and efficiency of the Araldite 2011 epoxy adhesive reinforced with the thermoplastic co-polyester (TPC). Heating the joint results in melting the co-polyester in adhesive, and then it is expected to repair the damaged region by the melted co-polyester. Firstly, before applying the self-healing process, a preliminary study was applied to define whether selected adhesive is compatible with the thermoplastic particles in terms of self-healing. From the initial results, it is seen that Araldite 2011 adhesive is suitable for use in the self-healing mechanism. In the healing cycle, initial crack in the reinforced adhesive was propagated until 30 mm during the double cantilever beam (DCB) testing. The fractured specimens were repeatedly healed in terms of the close-then-heal (CTH) scheme until no healing has taken place. After the healing process was completed, the healing efficiency was defined using the fracture energy values. In this study, the healing process was repeated two times with the acceptable healing efficiencies. It is concluded that the damaged reinforced adhesive can repair itself with a considerable healing efficiency

Variational Principles for Bending and Vibration of Partially Composite Timoshenko Beams

Variational principles are established for the partially composite Timoshenko beam using the semi-inverse method. The principles are derived directly from governing differential equations for bending and vibration of the beam considered. It is concluded that the semi-inverse method is a powerful tool for searching for variational principles directly from the governing equations. Comparison between our results and the results reported in literature is given

A Comparative Evaluation of Numerical and Analytical Solutions to the Biadhesive Single-Lap Joint

This paper attempts to address the detailed verification of Zhao’s analytical solution including the moment effect with the two- and three-dimensional finite element results. Zhao compared the analytical results with only the 2D FEA results and used the constant bond-length ratio for the biadhesive bondline. In this study, overlap surfaces of the adherends and the adhesives were modelled using surface-to-surface contact elements. Both analytical and numerical analyses were performed using four different biadhesive bondline configurations. The 3D FEA results reveal the existence of complex stress state at the overlap ends. However, the general results show that analytical and numerical results were in a good agreement

A Rare Case: Improved Heart Failure with Anti-Complement Therapy in Complement-Dependent Hemolytic Uremic Syndrome

MakaleWOS:000925209300014xtrarenal involvement occurs in approximately 20% of patients with complement-mediated hemolytic-uremic syndrome. The involvement is usually of the nervous system, and cardiac involvement occurs in 3%-10% of patients. Cardiac manifestations vary, including myocardial infarction, cardiomyopathy, and acute decompensated heart failure. Among these patients, thrombotic microangiopathy-related cardiac dysfunction is mainly due to the continuous activation of the complement system, which leads to endothelial damage and thrombosis in the coronary microvessels. We wanted to highlight the importance of cardiac evaluation at the time of diagnosis or during follow-up in thrombotic micro-angiopathy patients by presenting a case of heart failure with low ejection fraction in a 24-year-old young patient in whom we detected complement-mediated hemolytic-uremic syndrome, a secondary mutation of complement factor H receptor. It is still an unknown issue because of the rarity of cardiac involvement in complement-mediated hemolytic-uremic syndrome patients. Primary myocardial involvement is increasingly recognized as a possible concomitant feature of hemolytic-uremic syndrome. Failure to perform a detailed cardiac evaluation both at diagnosis and during follow-up in complement-mediated hemolytic-uremic syndrome patients can lead to fatal outcomes. Anti-complement therapy can also lead to good cardiac outcomes in these patients

Brevibacillus gelatini sp nov., isolated from a hot spring

Two Gram-stain-positive, moderately thermophilic, endospore-forming, rod-shaped, motile bacteria designated PDF4(T) and PDF10, were isolated from Camkoy hot spring in the provinces of Aydin, Turkey and were characterized in order to determine their phylogenetic position. 16S rRNA gene sequence analysis revealed that the two strains belonged to the genus Brevibacillus. Strain PDF4(T) showed highest 16S rRNA gene sequence similarity to strain PDF10 (99.5 %), Brevibacillus brevis DSM 30(T) (98.9 %), Brevibacillus parabrevis DSM 8376(T) (98.6 %) and Brevibacillus formosus DSM 9885(T) (98.5 %); similarities to other species of the genus Brevibacillus were less than 98.5 %. The predominant fatty acids of strain PDF4(T) were anteiso-C-15 : 0 (60.0 %) and iso-C-15 : 0 (22.3 %). The polar lipids of strain PDF4(T) consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, an unknown phospholipid, two unknown lipid, an unknown aminophospholipid and two unknown aminolipids. MK-7 was detected as a sole respiratory quinone, and the cell wall of strain PDF4(T) contained meso-diaminopimelic acid. The DNA G + C content of strain PDF4(T) was 51.7 mol%. DNA-DNA hybridization showed less than 60 % relatedness between strain PDF4(T) and type strains of the most closely related species given above. Based on these data, the two strains are considered to represent a novel species of the genus Brevibacillus, for which the name Brevibacillus gelatini sp. nov. is proposed. The type strain is PDF4T (=NCCB 100559(T) =DSM 100115(T)).Karadeniz Technical University 2008.111.04.

Sialolit: 3 olgunun klinik, radyografik ve ultrasonografik bulguları ile birlikte değerlendirilmesi

TANITIM: Sialolitler (tükürük bezi taşı) tükürük bezinde veya kanalında oluşan kalsifiye tıkanıklıklardır. Tükürük bezlerinin en sık görülen rahatsızlıkları içinde yer alırlar. Sialolitlerin büyük bir kısmı submandibular bezdemeydana gelmektedir ve her yaşta izlenebilmektedir. Klinik muayene ile birlikte konvansiyonel radyografi, ultrasonografi (USG) ve bilgisayarlı tomografi (BT) tanıda kullanılan yöntemlerdendir. OLGU BİLDİRİMİ: Birinci olguda 66 yaşındaki kadın hastadan dental nedenlerle istenilen panoramik radyografta, sağmandibula korpusunun hemen altında ve solmandibula angulus bölgesinde radyoopak oluşumlar izlendi. Ultrasonografik incelemede bu oluşumların sialolit olduğu belirlendi. Herhangi bir semptomu bulunmayan hasta periyodik takibe alındı. İkinci olguda 61 yaşındaki erkek hastanın intraoral muayenesinde, ağız tabanında sol submandibular bez bölgesinde sert kitleler palpe edildi ve sol Wharton kanalında tükürük akışının olmadığı gözlemlendi. Panoramik ve alt oklüzal radyograflarda izlenen radyoopasiteler üzerine istenen ultrasonografide sialolit ön tanısı doğrulandı ve sialolitler intraoral olarak eksize edildi. Üçüncü olguda, kliniğimize sağ yanak ve kulak bölgesinde yemek yerken oluşan ağrı şikayetiyle başvuran 55 yaşındaki kadın hastanın intraoral muayenesinde Stenon kanal ağzında püy akışı izlendi. Bunun üzerine istenen ultrasonografide sialolit tespit edildi ve enfekte olan sağ parotis bezinin heterojen ekojenitede olduğu izlendi. Genel anestezi altında cerrahi eksizyon yapıldı. SONUÇ: Sialolitlerin teşhisinde doğru görüntüleme yönteminin seçilmesi ve yorumlanması büyük önem taşımaktadır; teşhis ve tedavi aşamalarımultidisipliner yaklaşımgerektirir

Peripheral vs. central cannulation in cardiac reoperations: Technical considerations and outcomes

Objective: To compare peripheral and central cannulation techniques in cardiac reoperation.Methods: This retrospective study included 258 patients undergoing cardiac reoperation between January 2013 and July 2018. Patients were divided into two groups according to the cannulation type. The first group included 145 (56.2%) patients operated with standard central cannulation through aorta and right atrium or bicaval cannulation. In this group, cardiopulmonary bypass was instituted after sternotomy. The second group consisted of 113 (43.8%) patients operated with peripheral cannulation through femoral artery, vein, and internal jugular vein. In this group, cardiopulmonary bypass was started before sternotomy and after systemic heparinisation. The two groups' operative complications and postoperative outcomes were compared.Results: Procedure-related injury was higher in the central cannulation group than in the peripheral cannulation group (8.3% vs. 1.8%, respectively, P=0.038). Cardiopulmonary bypass time was shorter in the central cannulation group (P=0.008) and total operation time was similar between the groups (P=0.115). Postoperative red blood cell requirement was higher with central cannulation (P=0.004). Operative mortality (2.8% vs. 0, P=0.186), hospital mortality (4.3% vs. 2.7%, P=0.523), and one-year survival rate (90.3% vs. 94.7%, P=0.202) were similar between the groups.Conclusion: Peripheral cannulation reduces cardiac injury and blood transfusion in cardiac reoperation. The cannulation type does not affect postoperative complication, mortality, and one-year survival

Nest survival and transplantation success of formica rufa (Hymenoptera: Formicidae) ants in Southern Turkey: A predictive approach

Research highlights: Formica rufa is used widely for biocontrol in Turkish forests. Although ecological characteristics of red wood ant habitats are well known, the statistical significance of these characteristics and their effects on nest transplantation success are largely unknown. Having such knowledge on a local scale, however, can help to predict the success of a scheduled transplantation effort, and can prevent loss of time and money. Background and objectives: In the present study, we used nest transplantation data from southern Turkey to determine habitat parameters that have a significant impact on nest survival, and to investigate possibility of predicting transplantation success from habitat parameter data. Materials and methods: Algorithms of data mining are widely used in agricultural and forestry applications for a wide range of tasks. In the present study, we used descriptive statistics to summarize the transplantation profile according to six habitat parameters (altitude, aspect, canopy closure, landform, nest substrate, and slope). We also used classification, a data mining approach, with two of its methods (decision tree and naive Bayes) to determine the most important habitat parameters for nest survival and predict nest transplantation success in southern Turkey. Results: We found that altitude, aspect, and canopy closure were the most important factors affecting transplantation success. We also show that classification methods can be used in not only classifying, but also predicting the success rate of future transplantations. Thus, we show that the possibility of success for a given area can be predicted when certain parameters are known. Conclusions: This method can assist biological control practitioners in planning biocontrol programs and selecting favorable spots for red wood ant nest transplantation. © 2020 by the authors

Germinating in Box: An Effective and Practical Method for Grape Seed Germination

Asma ıslahında en önemli engellerden biri, iki üzüm çeşidinin melezlenmesi sonucu elde edilen melezçekirdeklerin çimlenme oranının düşük olmasıdır. Çimlenmeyi etkileyen en önemli faktörler arasında;ortam ve tohum nemi gelir. Ayrıca büyümeyi düzenleyici maddeler (BDM)de, çimlenmeyi olumluetkilemektedir. Bu çalışmada, melez üzüm çekirdeklerine BDM uygulamak ve kapalı ortamlarda kararlı birnem düzeyinde çimlendirilmek suretiyle çimlenme oranını arttırmak amaçlanmıştır. Alphonse Lavalle ×Regent melezlemesinden elde edilen F? melez çekirdekleri, nemlendirilmiş perlitte 4 ay süreyle, +5?’dakatlamayı takiben; torf: perlit (1:1) harç ortamı içeren 5 cm çapındaki torf saksılara ekilmiştir. Çimlenmeyiteşvik etmek için, çekirdekler ekimden önce 24 saat gibberellik asit (GA?, 1000 ppm, benzil aminopurin(BAP, 1000 ppm), GA?+BAP (1000 ppm+1000 ppm), hidrojen peroksit (H?O?, 1 M) çözeltisinde ve suda(kontrol) tutulmuştur. Saksılar, bağıl nem miktarı sürekli %99 düzeyinde olan kapaklı plastik kutularakonulmuş ve bu kutular sıcaklığı 27? olan çimlendirme odalarına alınmıştır. Çimlenen çekirdekler yineplastik kutulara konularak sıcaklığı 25? olan ve kutuların hemen üstü LED lambalar ile aydınlatılmış(PAR=135–317 ?mol m?² s?¹) bitki gelişme odalarına yerleştirilmiştir. Kutuların kapakları her iki odada dakapalı tutulmuştur. Bitkicikler 3–5 gerçek yaprak oluşunca, plastik torbalara alınmış ve daha sonra ısıtmalıseraya alınmıştır. Uygulamalar sonucunda çimlenen çekirdek ve elde edilen bitki yüzdesi kontrolde %60.39iken, 1000 ppm GA? uygulanmış çekirdeklerde %78.32’ye kadar yükselmiştir. Üzüm çekirdeklerinin 24saat GA? çözeltisine batırılmasından sonra plastik kutularda çimlendirilmesi ve bunu takiben yine plastikkutularda geliştirilmesi, asma ıslahı çalışmalarında başarıyı arttıracak etkin bir yöntemdir.One of the main problems of grape breeding is low germination rate of hybrid seeds obtained by crossing of grape varieties. Humidity in grape seeds and germination media have extremely important for germination. In addition, some plant growth regulators (PGR) have positive effects on germination. Hybrid seeds obtained by Alphonse Lavallee and Regent grape cultivars were straficated at 5? for 4 months in damp perlite. Seeds were immersed in PGR solutions such as Gibberellic Acid (GA?, 1000 ppm), Benzyl aminopurine (BAP, 1000 ppm), Hydrogen peroxide (H?O?, 1 M), GA? + BAP (1000 ppm + 1000 ppm) and water as a control. Then, they were sown in torf pots with 5cm diameter containing perlite: torf (v/v, 1:1) mixture. Pots were put in plastic boxes with lid containing humidity 99%. All boxes were placed to germination room with temperature 27? and in dark condition. Germinated seeds were transferred another plastic box and put in growth room illuminated by LED lamps (PAR=135–317 ?mol m?² s?¹) and heated to 25?. Lids of boxes were closed position in both rooms. Seedlings with 3–5 true leaves were transferred to plastic seedling bags containing perlite: torf (v/v, 1:1) and then they were moved to greenhouse. Germination rate and obtained seedling rate were increased up to 78.32%at 1000 ppm GA? application when compared to control (60.39%). Germinating grape seeds after immersing in GA? for 24 hours and thereinafter growing seedlings in plastic boxes are an effective method for hybrid seed germination in grape breeding