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Deneysel çalışmalarda periferik sinirin akson çapı, miyelinli sinir lifi çapı ve miyelinli sinir için iç çap/dış çap oranı (g-ratio), demiyelinizasyon, remiyelinizasyon ve sinir onarımının değerlendirilmesinde görüntü analiz programlarından yararlanılmaktadır. Bu nedenle, morfometrik değerlendirmeye sıklıkla gereksinim duyulan periferik sinir çalışmaları hedeflenerek, laboratuvarımızda yarı otomatik bir görüntü analiz programı geliştirilmiştir. Çalışmamızda, geliştirdiğimiz görüntü analiz yazılımının performansının, serbest erişimli çok amaçlı diğer bir yazılım ile güvenilirlik yönünden karşılaştırılması amaçlanmıştır. Farelerin genel anestezi altında siyatik sinirlerinden alınan doku örnekleri gluteraldehit solüsyonuna alınmıştır. Rutin elektron mikroskop takip yöntemlerinden geçirilerek epoksi resin (epoxy resin) gömülen dokulardan yarı ince kesitler alınmış ve toluidin mavisi ile boyanmıştır. Kesitler dijital kameralı ışık mikroskopta incelenmiş ve X100’lük objektifte fotoğraflanmıştır. Mikrograflar laboratuvarımızda geliştirilen Tantuna Morfometrik Ölçüm Sistemi (TanTuna Morphometric Measuring System; TT-MMS) yazılımı ile analiz edilmiştir. Seçilen iki adet ışık mikrograftan rastgele seçilen 200 adet miyelinli akson kesitinin ölçümleri program kullanılarak yapılmıştır. Aynı ölçümler ImageJ programı ile tekrarlanmış ve her iki programla elde edilen veriler istatistiksel olarak karşılaştırılmıştır. Ek bir donanıma ihtiyaç duymadan her iki yazılımın da güvenilir olduğu ve birbirleriyle uyumlu ölçümler yaptıkları saptanmıştır (p, Image analysing programs are used in peripheral nerve studies to measure axon diameter, myelinated nerve diameter and the ratio of inner axonal diameter to outer diameter (g-ratio), demyelination, remyelination and nerve repair. So, a semi-automatic, image analysis program was developed in our laboratory by targeting peripheral nerve studies which morphometric evaluation is frequently required. It is aimed to compare the performance and reliability of this program with another free access multipurpose software. Tissue samples from sciatic nerves of mice were taken into gluteraldehyde solution under general anesthesia. After routine electron microscopic processing method, semi-thin sections were taken from epoxy resin embedded blocks and stained with toluidine blue. Sections were examined and photographed under the light microscope at X100 magnification. Micrographs were analyzed using the Tantuna Morphometric Measuring System (TT-MMS) software developed in our laboratory. Measurements of the randomly selected 200 myelinated axon sections from two selected light micrograph were performed using the program. The measurements were repeated with ImageJ program and data obtained using both programs were compared statistically. We determined that both softwares are reliable and measurements compatible with each other (p

The increase in autoimmune diseases in recent years has drawn attention back to the thymus, with new approaches to improve and/or restore immune function being investigated. As the primary lymphoid organ responsible for functional T cell development, studies on the pre-/post-natal development of this organ and T lymphocytes in human and other species are of special interest. During our screening studies we observed structures that had not been described or mentioned previously, and named them “epitheliostromal sheaths”. Associated with these unique structures were also small attached lobules (possibly reflecting the maturational stages of thymic lobules), which the authors consider as markers of histogenesis and the growth of the organ during early childhood; these findings are thus presented to researchers in this field. Approximately 1000 sections prepared from infantile thymic tissues of partial biopsy specimens were immunostained and examined. Specimens were taken from ten patients (with informed consent) in the age range of 4–9 years who underwent surgery due to congenital cardiovascular anomalies but were otherwise normal. Digital images of interest were captured to describe them in detail. Determining the immunophenotype of the compartments in these newly developing lobules assisted us greatly in defining compartments and their growth order. In summary, our findings suggest a niche-based thymus growth mechanism during childhood. We presented our findings, hoping to provide additional insight to researchers aiming to restore thymus function in adulthood and improve its immunological functions.