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Articles 13141 - 13170 of 13312
Full-Text Articles in Entire DC Network
The Communicator, June, 1961, Bronx Community College
The Communicator, June, 1961, Bronx Community College
The Communicator
The Communicator newspaper published in June, 1961.
Fine Structure Of The Spermatozoon Of Hydroides Hexagonus (Annelida), With Special Reference To The Acrosomal Region, Arthur L. Colwin, Laura Hunter Colwin
Fine Structure Of The Spermatozoon Of Hydroides Hexagonus (Annelida), With Special Reference To The Acrosomal Region, Arthur L. Colwin, Laura Hunter Colwin
Publications and Research
This paper describes in some detail the structure of the acrosomal region of the spermatozoon of Hydroides as a basis for subsequent papers which will deal with the structural changes which this region undergoes during fertilization. The material was osmium-fixed and mild centrifugation was used to aggregate the spermatozoa from collection to final embedding. The studies concern also the acrosomal regions of frozen-thawed sperm prepared by a method which previously had yielded extracts with egg membrane lytic activity. The plasma membrane closely envelops four readily recognizable regions of the spermatozoon: acrosomal, nuclear, mitochondrial, and flagellar. The acrosome consists of an …
Changes In The Spermatozoon During Fertilization In Hydroides Hexagonus (Annelida): Ii. Incorporation With The Egg, Arthur L. Colwin, Laura Hunter Colwin
Changes In The Spermatozoon During Fertilization In Hydroides Hexagonus (Annelida): Ii. Incorporation With The Egg, Arthur L. Colwin, Laura Hunter Colwin
Publications and Research
This, the last of a series of three papers, deals with the final events which lead to the incorporation of the spermatozoon with the egg. The material used consisted of moderately polyspermic eggs of Hydroides hexagonus, osmium-fixed at various times up to five minutes after insemination. The first direct contact of sperm head with egg proper is by means of the acrosomal tubules. These deeply indent the egg plasma membrane, and consequently at the apex of the sperm head the surfaces of the two gametes become interdigitated. But at first the sperm and egg plasma membranes maintain their identity and …
Changes In The Spermatozoon During Fertilization In Hydroides Hexagonus (Annelida): I. Passage Of The Acrosomal Region Through The Vitelline Membrane, Laura Hunter Colwin, Arthur L. Colwin
Changes In The Spermatozoon During Fertilization In Hydroides Hexagonus (Annelida): I. Passage Of The Acrosomal Region Through The Vitelline Membrane, Laura Hunter Colwin, Arthur L. Colwin
Publications and Research
In the previous paper the structure of the acrosomal region of the spermatozoon was described. The present paper describes the changes which this region undergoes during passage through the vitelline membrane. The material used consisted of moderately polyspermic eggs of Hydroides hexagonus, osmium-fixed usually 9 seconds after insemination. There are essentially four major changes in the acrosome during passage of the sperm head through the vitelline membrane. First, the acrosome breaks open apically by a kind of dehiscence which results in the formation of a well defined orifice. Around the lips of the orifice the edges of the plasma and …
The Ticker, May 16, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Reporter, May 16, 1961
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Reporter, May 9, 1961
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Ticker, April 18, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, April 11, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, March 28, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, March 21, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Reporter, February 7, 1961
The Reporter, February 7, 1961
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Ticker, February 7, 1961
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Reporter, January 24, 1961
The Reporter, January 24, 1961
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Fine Structure Of Haematolœchus Spermatozoan Tail, J. E. Shapiro, B. R. Hershenov, G. S. Tulloch
The Fine Structure Of Haematolœchus Spermatozoan Tail, J. E. Shapiro, B. R. Hershenov, G. S. Tulloch
Publications and Research
No abstract provided.
Egg Membrane Lytic Activity Of Sperm Extract And Its Significance In Relation To Sperm Entry In Hydroides Hexagonus (Annelida), Arthur L. Colwin, Laura Hunter Colwin
Egg Membrane Lytic Activity Of Sperm Extract And Its Significance In Relation To Sperm Entry In Hydroides Hexagonus (Annelida), Arthur L. Colwin, Laura Hunter Colwin
Publications and Research
Previous electron microscope studies indicated that the individual spermatozoön of Hydroides hexagonus forms a hole in the vitelline membrane by means of lysis. Other observations established that the hole is real, being visible in living material during sperm entry. During the present investigation sea water extracts from frozen-thawed sperm were tested for lytic effect on the membrane. In normal living eggs the membrane appears as a single thick envelope, but in electron micrographs of sections it is seen to consist of a narrow outer border layer, a wide principal or middle layer, and a narrow inner border layer. After immersion …
Formation Of Sperm Entry Holes In The Vitelline Membrane Of Hydroides Hexagonus (Annelida) And Evidence Of Their Lytic Origin, Laura Hunter Colwin, Arthur L. Colwin
Formation Of Sperm Entry Holes In The Vitelline Membrane Of Hydroides Hexagonus (Annelida) And Evidence Of Their Lytic Origin, Laura Hunter Colwin, Arthur L. Colwin
Publications and Research
Electron micrographs of inseminated eggs of Hydroides hexagonus previously had shown that in the immediate vicinity of the penetrating spermatozoön a small portion of the vitelline membrane regularly was absent, and it had been suggested that this area was a hole made by lytic activity of the individual spermatozoön during the course of its passage through the membrane. This deduction would receive support if it could be established that a sperm entry hole does form in living material. During the present study a hole repeatedly observed and photographed in the membrane of living eggs was found to arise as the …
The Ticker, February 16, 1960
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, February 9, 1960
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Reporter, April 1, 1959
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Ticker, January 6, 1959
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, October 14, 1958
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Effect Of Ions Upon The Response Of Smooth Muscle To Cooling, Rita Guttman, Samuel M. Ross
The Effect Of Ions Upon The Response Of Smooth Muscle To Cooling, Rita Guttman, Samuel M. Ross
Publications and Research
The slow tonic responses of the anterior byssus retractor of Mytilus edulis to rapid cooling were investigated by simultaneously recording tension and resting potential changes after soaking the muscle in banthine, a powerful neuromuscular blocking agent. The quantitative relations between the amount of cooling and the amount of associated depolarization necessary for contraction at various concentrations of potentiating potassium can be expressed in a family of curves. The plateaus of the curves for sea water and for potassium-free sea water were beneath the depolarization value necessary for contraction, so that it is clear that no amount of cooling with sea …
The Reporter, May 20, 1958
The Reporter
The Reporter was Baruch College's evening session newspaper. Founded in 1923, when Baruch College was still part of City College, the Reporter billed itself as "the Oldest Evening Session College Newspaper Published in the United States." It ceased publication in 2002.
The Ticker, May 13, 1958
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, March 25, 1958
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, January 3, 1958
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, November 12, 1957
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, October 1, 1957
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.
The Ticker, September 24, 1957
The Ticker, September 24, 1957
The Ticker
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York.