Observations on the Nerve Fibres of Aurellia Aurita

1954 ◽  
Vol s3-95 (29) ◽  
pp. 85-92
Author(s):  
ADRIAN HORRIDGE
Keyword(s):  
Silver Staining ◽  
Phase Contrast ◽  
Living Animal ◽  
Nerve Fibres ◽  
Phase Contrast Microscope ◽  
Nerve Net ◽  
Contrast Microscope ◽  
Oblique Illumination ◽  
Physiological Studies

The nerve fibres of Aurellia aurita were originally described by E. A. Shäfer from gold preparations. This work has been repeated with Holmes's method of silver staining on the slide. Results have been obtained substantially in agreement with those of Shäfer. The same nerves can be seen in the living animal when a phase-contrast microscope or oblique illumination is used. By the use of these techniques, a study has been made of the plan of the nerve net over the subumbrellar surface of the bell. This work is intended as an anatomical foundation for physiological studies to be described elsewhere.

Histochemical and Morphological Studies of Lipids in the Oogenesis of Pheretima posthuma

1958 ◽  
Vol s3-99 (48) ◽  
pp. 475-484
Author(s):  
VISHWA NATH ◽  
BRIJ L. GUPTA ◽  
S. L. MANOCHA
Keyword(s):  
Phase Contrast ◽  
Chemical Change ◽  
Follicular Epithelium ◽  
Cholesteryl Esters ◽  
Lipid Bodies ◽  
Interference Microscope ◽  
Phase Contrast Microscope ◽  
Morphological Studies ◽  
Contrast Microscope ◽  
Second Category

A study of the oocytes of the earthworm, Pheretima posthuma, examined fresh under the phase-contrast and interference microscopes as well as by histochemical techniques, has revealed that there are two types of lipid bodies in the cytoplasm. The lipid bodies of the first type (L1) are smaller, appear as homogeneous, dark granules under the phase-contrast microscope, and have a protein-phospholipid core surrounded by a thick sheath of phospholipids only. The lipid bodies of the second category (L2), which arise as a result of growth and chemical change in L1 bodies, have a pure phospholipid core surrounded by a thick triglyceride sheath. They give a ringed appearance under the phase-contrast microscope. The study under the interference microscope shows that this ringed appearance is an optical artifact. The lipid spheres present in the follicular epithelium contain phospholipids only. The mitochondria are in the form of minute granules. They remain unchanged throughout oogenesis. Some vacuoles devoid of any lipids, proteins, or carbohydrates have been observed. They also remain unchanged. Pure triglyceride spheres, yolk globules, nucleolar extrusions, as well as cholesterols and cholesteryl esters are absent.

Redescription of Neelus fimbriatus Bretfeld & Trinklein, 2000 (Collembola: Neelidae) from Colombia

Zootaxa ◽  
2018 ◽  
Vol 4527 (3) ◽  
pp. 414
Author(s):  
ELIDA P. MARÍN ◽  
JOSÉ G. PALACIOS-VARGAS
Keyword(s):  
Phase Contrast ◽  
Phase Contrast Microscope ◽  
Contrast Microscope

Neelus fimbriatus is redescribed using specimens from Colombia. Drawings and phase contrast microscope photos of the species are used. New characters are used as tibiotarsal tuberculate setae and abdominal ventral acetabula. 

Methods of transplanting nuclei from single cultured cells to unfertilized frogs' eggs

Development ◽  
1970 ◽  
Vol 24 (2) ◽  
pp. 249-255
Author(s):  
J. B. Gurdon ◽  
R. A. Laskey
Keyword(s):  
Xenopus Laevis ◽  
Phase Contrast ◽  
Cultured Cells ◽  
The Other ◽  
Phase Contrast Microscope ◽  
Cell Method ◽  
Attached Cell ◽  
Contrast Microscope

Two methods of transplanting single nuclei from monolayers of cultured cells to unfertilized eggs of Xenopus laevis are described, illustrated, and tested. The detached-cell method is simpler and quicker to operate and is suitable for homogeneous populations of cells which are easily removed from the substrate on which they are growing. The other, attached-cell, method is technically more elaborate, but is applicable to cells whose properties can be individually determined under the phase-contrast microscope and to cells which are not readily dissociated from other cells or from their substrate.

scholarly journals Evaluation of Haematuria and Use of Phase Contrast Microscope: A Short Review

1970 ◽  
Vol 20 (1) ◽  
pp. 63-67 ◽  
Author(s):  
T Sultana ◽  
T Sultana ◽  
MQ Rahman ◽  
ANN Ahmed
Keyword(s):  
Phase Contrast ◽  
Diagnostic Marker ◽  
Short Review ◽  
Red Cells ◽  
Phase Contrast Microscopy ◽  
Red Cell ◽  
Phase Contrast Microscope ◽  
Non Invasive ◽  
Contrast Microscope ◽  
Contrast Microscopy

For centuries physicians have been using urine as one of the non-invasive means for assessing diseases. Haematuria is a frequently encountered abnormality in clinical practice. Haematuria may have either a glomerular or a non-glomerular origin. The morphological study of urinary red cells by Phase-Contrast Microscopy (PCM) is a useful diagnostic marker for glomerular bleeding, if correctly interpreted and used. Today, urinalysis and in particular identification of red cells morphology by Phase-Contrast Microscopy has been a widely accepted technique for determining the site of haematuria. A short review on haematuria and Phase-Contrast Microscopy are presented here for updating knowledge and academic interest. Key words: Phase-contrast microscope; Haematuria; Dysmorphic red cell. DOI: http://dx.doi.org/10.3329/jdmc.v20i1.8584 J Dhaka Med Coll. 2011; 20(1) :63-67

scholarly journals Qualities of goat semen in Tris-Citrate-Glucose extender containing glutathione

1970 ◽  
Vol 27 (2) ◽  
pp. 46-55 ◽  
Author(s):  
B Mishra ◽  
MGS Alam ◽  
MAMY Khandokar ◽  
S Mazumder ◽  
MN Munsi
Keyword(s):  
Sperm Motility ◽  
Artificial Insemination ◽  
Phase Contrast ◽  
Phase Contrast Microscope ◽  
Contrast Microscope ◽  
And Control ◽  
Control Samples

Glutathione (GSH) 0 (control), 2, 4 and 8 mM was used in the preservation of chilled goat semen. Treated and control samples were kept at 4 – 5°C up to seven days. Sperm motility and acrosome abnormality were assessed daily under phase contrast microscope. The sperm motility was significantly (P<0.01) higher in the semen treated with 8 mM GSH. Optimum sperm motility (≥50%) for artificial insemination was retained for three days with 2 and 4 mM GSH and up to four days with 8 mM GSH. Acrosomal damage was significantly (P<0.01) reduced to ≤ 1.0% after addition of 8 mM GSH. It is suggested that GSH may be used as an antioxidant for better preservation of goat semen for artificial insemination. DOI: 10.3329/bvet.v27i2.7554 Bangl. vet. 2010. Vol. 27, No. 2, 46 – 55

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