scholarly journals The Ultrastructure of the Vegetative Cell of Blue-Green Algae

1963 ◽  
Vol 16 (3) ◽  
pp. 585 ◽  
Author(s):  
DC Wildon ◽  
FV Mercer
Keyword(s):  
Endoplasmic Reticulum ◽  
Electron Density ◽  
Green Algae ◽  
Central Region ◽  
Vegetative Cell ◽  
Basic Structure ◽  
Golgi Body ◽  
Peripheral Region ◽  
Cytoplasmic Matrix ◽  
Blue Green Algae

An electron.microscopic study has been made of thG vegetative cells of eight genera of the blue-green algae. A basic structure has been defined for the vegetative cell. There is a cytoplasmic matrix which extends throughout the cell. No membranebound organelles of the categories chloroplast, mitochondrion, nucleus, golgi body, and endoplasmic reticulum can be recognized therein. There are two regions within the cell. The peripheral region is distinguished by the presence of "photosynthetic" lamellae and various granular inclusions. The central region is distinguished by the presence of crystalline granules, and areas of low electron density which resemble the nucleoid regions of bacteria. Ribosome.like granules are seen scattered throughout the cytoplasmic matrix.

scholarly journals ELECTRON MICROSCOPIC OBSERVATIONS ON ANTIBODY-PRODUCING CELLS IN LYMPH AND BLOOD

1966 ◽  
Vol 124 (2) ◽  
pp. 255-262 ◽  
Author(s):  
Klaus Hummeler ◽  
T. N. Harris ◽  
Natale Tomassini ◽  
Maureen Hechtel ◽  
Miriam B. Farber
Keyword(s):  
Endoplasmic Reticulum ◽  
Thoracic Duct ◽  
Peripheral Blood ◽  
Lymphatic Vessels ◽  
Spherical Shape ◽  
Golgi Body ◽  
Central Position ◽  
Electron Microscopic ◽  
Cytoplasmic Matrix ◽  
Relative Scarcity

Antibody-producing cells have been identified among cells obtained from efferent lymphatic vessels, the thoracic duct, and peripheral blood. These cells, which produced plaques of hemolysis and which were quite rare (20 to 50 per million), due in most instances to 19S antibody, were located and studied by electron microscopy. Of the antibody-producing cells found in these three sites there were several features common to all: small size (5 to 8 µ), generally spherical shape, approximately central position of the nucleus, and retention in the nucleus of the condensations of chromatin characteristic of the lymphocyte. The differences among the cells of these sources were largely in the relative amount and state of organization of the organelles of the cytoplasm. In cells of the efferent lymphatic vessel and the thoracic duct, the endoplasmic reticulum showed a range from relative scarcity to considerable numbers of well organized channels. Between these extremes were cells with a considerable amount of endoplasmic reticulum, the channels disorganized and sectioned at various angles. The cytoplasmic matrix of all of these contained a profusion of polyribosomes. Antibody-producing cells obtained from peripheral blood showed, around the roughly spherical nucleus, a ring of cytoplasm which was narrow, but wholly organized into parallel lamellae of endoplasmic reticulum, with many polyribosomes between these, and a large Golgi body. Some similarities and some differences of these cells, in comparison with antibody-producing cells obtained from lymph nodes, have been indicated.

Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

1967 ◽  
Vol 25 ◽  
pp. 74-75
Author(s):  
L. V. Leak
Keyword(s):  
Cell Wall ◽  
Electron Microscope ◽  
Green Algae ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Electron Microscopic ◽  
Photosynthetic Membranes ◽  
Blue Green Algae ◽  
Cell Biol ◽  
Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

Analysis of the Anterior Secretory Cells of Onchidohs Muricata (Nudibranchia)

1981 ◽  
Vol 39 ◽  
pp. 614-615
Author(s):  
Roy Skidmore
Keyword(s):  
Endoplasmic Reticulum ◽  
Secretory Granules ◽  
Golgi Body ◽  
The Body ◽  
Secretory Cells ◽  
Secretory Vesicles ◽  
High Magnification ◽  
Large Numbers ◽  
Membrane Bound ◽  
Sole Of The Foot

The long-necked secretory cells in Onchidoris muricata are distributed in the anterior sole of the foot. These cells are interspersed among ciliated columnar and conical cells as well as short-necked secretory gland cells. The long-necked cells contribute a significant amount of mucoid materials to the slime on which the nudibranch travels. The body of these cells is found in the subepidermal tissues. A long process extends across the basal lamina and in between cells of the epidermis to the surface of the foot. The secretory granules travel along the process and their contents are expelled by exocytosis at the foot surface.The contents of the cell body include the nucleus, some endoplasmic reticulum, and an extensive Golgi body with large numbers of secretory vesicles (Fig. 1). The secretory vesicles are membrane bound and contain a fibrillar matrix. At high magnification the similarity of the contents in the Golgi saccules and the secretory vesicles becomes apparent (Fig. 2).

Fine Structure of Planarian Neuroglial Cell

1976 ◽  
Vol 34 ◽  
pp. 188-189 ◽  
Author(s):  
Michio Morita ◽  
Jay Boyd Best
Keyword(s):  
Endoplasmic Reticulum ◽  
Ventral Nerve Cord ◽  
Osmium Tetroxide ◽  
Golgi Body ◽  
Nerve Fibers ◽  
Neuroglial Cell ◽  
Glutaraldehyde Solution ◽  
Deep Indentation ◽  
Cytoplasmic Processes ◽  
Longitudinal Nerve

The species of the planarian Dugesia dorotocephala was used as the experimental animal to study a neuroglial cell in the ventral nerve cord. Animals were fixed with 3% buffered glutaraldehyde solution and postfixed with 1% buffered osmium tetroxide.The neuroglial cell is multipolar, expanding into three or four cytoplasmic processes with many daughter branches. Some neuroglial processes are found to extend perpendicular to the longitudinal nerve fibers, whereas others are seen to be parallel to them. The nucleus of the neuroglial cell is irregular in shape and frequently has a deep indentation. Convex portions of the nucleus seem to be related to the areas from which cytoplasmic processes are extended. Granular endoplasmic reticulum (Fig. 4), Golgi body (Fig. 2), mitochondria (Figs. 1 and 2), microtubules (Fig. 4), and many glycogen granules are observable in the electron dense neuroglial cytoplasm. Neuroglial cells are also observed to contain various sizes of phagosomes and lipids (Fig. 2).

New constituents from Oryza sativa L. straw and their algicidal activities against blue-green algae

2017 ◽  
Vol 40 (1) ◽  
pp. 47-62 ◽  
Author(s):  
I. M. Chung ◽  
S. H. Kim ◽  
Y.T. Oh ◽  
M. Ali ◽  
A. Ahmad
Keyword(s):  
Oryza Sativa ◽  
Green Algae ◽  
Oryza Sativa L ◽  
Blue Green Algae

ISOLATION, IDENTIFICATION AND CHARACTERIZATION OF A STRAIN OF BLUE-GREEN ALGAE-LYSING BACTERIUM FROM LAKE DIANCHI

2009 ◽  
Vol 33 (5) ◽  
pp. 860-865
Author(s):  
Lan-Lan LU ◽  
Gen-Bao LI ◽  
Yin-Wu SHEN ◽  
Ming-Ming HU ◽  
Yong-Ding LIU
Keyword(s):  
Green Algae ◽  
Lake Dianchi ◽  
Blue Green Algae ◽  
Identification And Characterization
Sign in / Sign up

Export Citation Format

Share Document