Failure to Find Intercellular Protoplasmic Continuity in Griffithsia Globulifera

نویسندگان

  • Howard J. Curtis
  • John L. Myers
چکیده

A method was devised for estimtaing the electrical resistance between the cytoplasm of adjacent cells of the red marine alga Griffithsia globulifera. A very high resistance was found, which argues strongly against the existence of protoplasmic continuity in this species.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Intercellular Bridges as Protoplasmic Anastomoses between Smooth Muscle Cells

In electron microscopic studies, protoplasmic anastomoses were found to occur between smooth muscle cells in the gastrointestinal tracts of rats. The protoplasmic connections are apparently cylindrical in form and contain cytoplasm having a density similar to that of the cellular regions connected. The membranes enclosing the cytoplasmic connections are continuous with the membranes of the conn...

متن کامل

Partial Purification and Characterization of a Glycoprotein Cell Fusion Hormone from Griffithsia pacifica, a Red Alga.

In filaments of the red alga Griffithsia, dead intercalary cells are replaced by the process of cell repair by cell fusion. This process is coordinated by a morphogenetic cell fusion hormone, rhodomorphin, which accelerates cell division and induces the production of a specialized repair cell. We have isolated rhodomorphin from Griffithsia pacifica Kylin and have purified it by concanavalin A a...

متن کامل

The effect of citric acid and citrate on protoplasmic droplet of bovine epididymal sperms

For evaluation of citric acid and citrate effects on bovine epididymal protoplasmic droplets, fifty bovine testes were collected in the October 2007 till June 2008 from Urmia slaughterhouse and transported to the laboratory in a cool container filled with 5 °C ice pack. Caudal epididymis was incised and sperm cells were put into Petri dishes containing hams f10 media with 10% fetal calf serum (...

متن کامل

Molecular systematic analysis reveals cryptic tertiary diversification of a widespread tropical rain forest tree.

The broad geographic range of many Neotropical rain forest tree species implies excellent dispersal abilities or range establishment that preceded the formation of current dispersal barriers. In order to initiate historical analyses of such widespread Neotropical trees, we sequenced the nuclear ribosomal spacer (ITS) region of Symphonia globulifera L. f. (Clusiaceae) from populations spanning t...

متن کامل

The intramembrane structure of septate junctions based on direct freezing.

Smooth septate junctions from the midgut of the cricket, Acheta, and the horseshoe crab, Limulus, as well as Hydra-type septate junctions from the epidermis of Hydra have been studied by freeze-fracture after direct freezing using the liquid helium-cooled copper block/slam freezing method. The exoplasmic fracture face at both types of septate junction exhibits rows of closely packed but irregul...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Journal of General Physiology

دوره 34  شماره 

صفحات  -

تاریخ انتشار 1950