Energy transfer from paramagnetic ions to a lattice through rapidly relaxing centers

Spin-lattice relaxation is analyzed in a crystal containing two types of paramagnetic centers having approximately equal resonant frequencies but markedly different spin-phonon couplings. It is assumed that for the centers having the strong spin-phonon coupling this coupling is stronger than the spin-spin coupling with other paramagnetic centers. The Green's function method is used. The spin-lattice relaxation time for the centers coupled weakly with the lattice through rapidly relaxing centers is found as a function of the difference between the splittings of their spin levels, the strength of the spin-spin coupling between these centers, the concentrations of these centers, and the strength of the spin-phonon coupling over rapidly relaxing centers. © 1972 Consultants Bureau

Effects Of Fresh And Sea Water On Growth, Estradiol-17β Concentration And Ovarian Development In Juvenile Tilapia

The effects of fresh water and sea water on growth, estradiol-17β levels, ovarian and oocyte development of Oreochromis niloticus, O. aureus and Tilapia zilli were determined. Sea water affected growth positively (p0.05)

Combined Spinal Epidural Anaesthesia for Caesarean Section and Hysterectomy in a Parturient with Placenta Accreta

Placenta accreta complicates the anaesthetic and surgical approach in caesarean section. In this report, a parturient with placenta accreta and multiple drug allergies who was managed using combined spinal epidural anaesthesia for caesarean hysterectomy is discussed

The Relation Between Echocardiographic Epicardial Fat Thickness and CHA2DS2-VASc Score in Patients with Sinus Rhythm

Abstract Objective: To evaluate the predictive value of epicardial fat thickness (EFT) in CHA2DS2-VASc (congestive heart failure, hypertension, age ≥75 years, diabetes mellitus, previous stroke or transient ischemic attack, vascular disease, age 65-74 years, sex category) score risk groups. Methods: A total of 158 consecutive patients (75 females, 83 males, mean age 70.8±6.3 years) admitted routinely for cardiologic control were divided into two groups according to their CHA2DS2-VASc scores (scores 0 and 1 were regarded as low risk, and score ≥2 as high risk). One hundred twenty-five of 158 patients had a high-risk score. Results: Mean EFT was significantly higher in the high-risk group than in the low-risk group (4.34±0.62 vs. 5.37±1.0; P<0.001). EFT was positively correlated with CHA2DS2-VASc score (r=0.577, P<0.001). According to receiver operating characteristics (ROC) analysis, EFT value of 4.4 mm was found to be predictive of high risk in CHA2DS2-VASc score with 80% of sensitivity and 79% of specificity (C-statistic = 0.875, P<0.001, 95% confidence interval [CI] = 0.76-0.90). And according to multivariate logistic regression analysis, EFT was an independent predictor of high thromboembolic risk in terms of CHA2DS2-VASc score. Conclusion: Our findings suggest that echocardiographic EFT measurement could provide additional information on assessing cardiovascular risks, such as thromboembolic events, and individuals with increased EFT should receive more attention to reduce unfavorable cardiovascular risk factors and the development of future cardiovascular events

Dosimetry and acute toxicity in prostate cancer patients treated with image-guided intensity modulated radiotherapy: preliminary results in the first 100 men

İstanbul Bilim Üniversitesi, Tıp Fakültesi.Amaç: Lokalize prostat kanseri olgularında uygulanan görüntü rehberliğinde yoğunluk ayarlı radyoterapinin (YART) dozimetrik ölçütlerini ve erken dönem akut yan etkilerini araştırmak amacıyla ilk 100 olgunun dosyaları retrospektif olarak incelendi. Gereç Ve Yöntem: Görüntü rehberliği amacıyla her olguda prostat içersine transüretral ultrason eşliğinde üç adet altın marker yerleştirildi, her tedavi öncesi bu markerların lokalizasyonu verifiye edildikten sonra radyoterapi uygulandı. Olguların risk gruplarına göre prostat +/- seminal veziküller +/- pelvik lenf nodları klinik hedef volüme dahil edildi. Hedef volüme ortanca 76 Gy (aralık, 74-78 Gy) radyoterapi uygulandı. Tedavi sonrası en az üç ay takip edilen olgular tedavi sırasında her hafta, tedavi sonrasında da 1. ayda akut toksisite açısından değerlendirildi ve akut yan etkiler RTOG skorlamasına göre derecelendirildi.Objectives: We aimed to analyze the dosimetric criteria and preliminary acute toxicity in the first 100 men treated with image-guided intensity modulated radiotherapy (IG-IMRT) for localized prostate cancer. Methods: For image guidance, three fiducial gold markers were implanted in each patient under transurethral ultrasound guidance. According to the risk group classification, prostate and/or seminal vesicles and/or pelvic lymph nodes were defined as the clinical target volume. A median of 76 Gy (range, 74-78 Gy) was delivered to the planning target volume. The patients were evaluated once a week during the treatment and one month after the completion of the treatment. Acute toxicity was scored according to the RTOG scoring system

Yoğunluk ayarlı radyoterapi uygulanan baş-boyun kanserli olgularda brakial pleksopati

İstanbul Bilim Üniversitesi, Tıp Fakültesi.Amaç: Yoğunluk ayarlı radyoterapi (YART) ile tedavi edilen baş boyun kaserli olgularda brakial bleksopati gelişmesinde rol oynayan prediktif faktörlerin belirlenmesi. Gereç ve Yöntem: Kliniğimizde 2005-2010 yılları arasında 159 baş boyun kanserli olguya YAET uygulanmıştır. Bu olgulardan en az 1 yıl takibi olan ve lokorejyonel kontrol sağlanmış 45’i bu çalışmaya dahil edilmiştir. En sık primer tümör bölgesi nazofarenks (%64) ve orofarenks (%16) idi. Onsekiz olguda hyoid altı lenf nodlarında tutulum vardı. Otuzsekiz olgu küratif, 7 olgu postoperatif amaçla ışınlanmıştı