منابع مشابه
Some Properties of a Photodynamic Pigment from Blepharisma
1. A pigment can be extracted from Blepharisma undulans by heat treatment of a concentrated suspension of the deeply pigmented animals. 2. In the presence of this pigment, various colorless protozoans are sensitized to light and killed if exposed long enough. The protozoans show a differential sensitivity, some being much more sensitive than others. 3. Bleached colorless blepharismas are not se...
متن کاملPhotooxidations in Pigmented Blepharisma
1. Blepharisma undulans, a protozoan with a reddish pigment, shows increased oxygen consumption under the influence of light. 2. If the light intensity is high, the animals are killed during a burst of oxygen consumption. 3. If the blepharismas are first bleached by exposure to light of low intensity they show only slightly increased oxygen consumption under the influence of light and they are ...
متن کاملDemonstration of a cytotoxin from Campylobacter jejuni.
A 48-hour culture filtrate of Campylobacter jejuni was found to produce cytopathic effects on three human cell lines--that is, HeLa, MRC-5 and Hep-2. The cytopathic effects observed include cell rounding, loss of adherence and cell death after 24-48 h of incubation. Such morphological changes were observed with eight of the eleven strains of Campylobacter jejuni isolated from the blood/stools o...
متن کاملSome Properties of the Pigment of Blepharisma
In connection with measurements of the metabolism of Blepharisma described in the preceding paper, the writer made certain observations on the red pigment of this organism. The pigment of the intact organism defies extraction with any of the common organic solvents, but it may easily be obtained in solution by macerating fresh cells in clean quartz sand and extracting with 90 per cent ethyl alc...
متن کاملفراوانی آنتی‌بادی ضد Cytotoxin associated Gene A در استان گلستان
زمینه و هدف : سویه‌های باکتری هلیکوباکترپیلوری که دارای پروتئین Cag A (Cytotoxin associated Gene A) می‌باشند؛ استعداد بیشتری برای ایجاد بیماری دارند. این پروتئین بیماری‌زایی باکتری را با افزایش تولید سیتوتوکسین در سلول میزبان تسریع می‌نماید. این مطالعه به منظور تعیین فراوانی آنتی‌بادی ضد CagA در افراد آلوده به هلیکوباکترپیلوری در استان گلستان انجام شد. روش بررسی : این مطالعه توصیفی روی 676 ...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1949
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1538293