Probing the structure of 'hematoporphyrin derivative' via fluorescence and absorbance spectroscopy.

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

Probing the structure and stability of the tumor-localizing derivative of hematoporphyrin by reductive cleavage with LiAlH4.

A procedure involving the use of the reducing agent lithium aluminum hydride (LiAlH4) has been designed to explore the nature of the oligomer linkages in the tumor-localizing component of hematoporphyrin derivative (HPD). High-performance liquid chromatography and fast-atom bombardment mass spectrometry were used to determine the reduction products. The results are consistent with a structure w...

Laser-induced Fluorescence Studies of Hematoporphyrin Derivative (hpd) In Normal and Tumor-tissue of Rat

Fluorescence studies of hematoporphyrin derivative in normal and malignant rat tissue.

Laser-induced fluorescence in rat tissue was studied during the uptake and clearing period of i.v.-injected hematoporphyrin derivative. A malignant rat tumor and normal tissue of 20 different kinds from the tumor-bearing animals were investigated. A pulsed nitrogen laser (337 nm) was used in conjunction with an optical multichannel analyzer system, in which the whole fluorescence light distribu...

Fluorescence and absorbance spectroscopy of the uranyl ion in nitric acid for process monitoring applications

Near real time process monitoring of the uranium content in an aqueous fuel recycling plant is a desired component of an advanced safeguards suite; Ultraviolet– Visible spectroscopy and Time Resolved Laser induced Fluorescence Spectroscopy can contribute to this technology gap. This work presents the observation of the spectroscopic parameters (molar absorptivities, fluorescent response) of the...