Stentor water ballet

Stentor is a genus of protozoan that is found in stagnant freshwater lakes and slow moving streams. In this case they were found in a partly frozen, small lake near Berlin, Germany, by the end of December 2014. The microorganism is named for a Greek hero in the Trojan War, who was renowned for his loud voice, in an analogous way to the sound of a trumpet rising up over the sound of other instruments. The description is fitting the microorganism because the organism is shaped somewhat like a trumpet.

Stentor species that live individual are too small to be noticed. The species that form colonies are so extremely common that they can be

Prostate

The prostate gland is shaped like a donut, weighs about an ounce and is the size of a chestnut. It consists 30% muscular tissue and 70% glandular tissue.
The prostate gland is just below the bladder, behind the pubic bone and just in front of the rectum. The prostate wraps around the urethra, which is the tube that carries urine from the bladder to the penis.

The prostate helps to control the flow of urine. During sexual activity, the seminal vesicles that are attached to the prostate

A frozen realm

The agate is maybe the most well known form of chalcedony. It is composed of microcrystallized quartz, which during its crystallization can trap impurities inside it in a way that the optic features of

Distinct differentiation of urine sediments requires Phase Contrast as a method of choice

Besides the identification of urinary passage infections a qualified investigation of urine sediments always has to reveal their renal or post-renal origin. As a consequence, bacteria, cylinder and erythrocytes have to be recognized clearly.

The microscopic examination of urine sediments deals with unstained, native samples; single colorless components can hardly be recognized in transmitted bright field and thus are easily overlooked.

Only an adequate contrast method will ensure the positive detection of cells and other low-contrast structures in urine sediments.

The necessary image quality can easily be achieved by using the optional Phase contrast on a transmitted light microscope. A quick switch between bright field and Phase contrast is possible and facilitate both illumination methods on one instrument.

Colored crystals and cell aggregations are treated with bright field, while Phase contrast allows a detailed identification of morphologic anomalies like dysmorphic erythrocytes and hyaline matrices (cylinder).

Some examples:

Picture 1 and 2

Phase contrast allows the distinct detection of the cylindrical structure. In bright field the Tamm-Horsfall protein is quite transparent and can easily be overlooked. In case cell structures are located within a hyaline matrix, the renal origin of these cells is obvious. The morphology of erythrocytes (eumorphic or dysmorphic) gives evidence to renal or post-renal bleeding.

Picture 1

Picture 2

Picture 3 and 4

The abundance of bacteria

Dodder, a spiraling parasite

Dodder (Cuscuta and Grammica), is a twining yellow or orange plant sometimes tinged with purple or red. Occasionally it is almost white. Dodder can be identified by its thin stems appearing leafless, with the leaves reduced to minute scales.

Dodder is classified as a member of the Morning-Glory Family (Convolvulaceae) in older references, and as a member of the Dodder Family (Cuscutaceae) in the more recent publications. Dodder parasitizes various kinds of

There is always some sun shining

Above we can see an aciculate aragonite that comes from Toledo. Its particular acicular form is determined by the ordering of its atoms, which tend to grow faster in the radial direction than in the others. This provides us needle-like structures all coming from a crystal nucleus.

Interestingly, its chemical formula is CaCO3, the same one as the calcite. Yet they are considered polymorphic

Antony van Leeuwenhoek was the first to discover…

Eimeria stiedae is a species of Eimeria (protozoal parasites) that causes hepatic coccidiosis in rabbits. It was observed for the first time by Antoni van Leeuwenhoek

Parfocality adjustment for upright microscopes

Parfocality is a property of the optical components that allows the microscope to stay in focus when changing between lenses of different magnification.

This means that when the objectives of a microscope are changed from higher to lower magnification or vice versa, the sample you are viewing stays in focus.

This is important especially when taking photographs or making videos using a microscope and a camera. If the parfocality is not adjusted, the camera will not be focusing correctly, even if the image seen through the eyepieces is in focus.

To ensure the correct parfocality adjustment of your microscope, just follow these easy steps:

1. Adjust the interpupillary distance so that both the right and left field of view become one.

2. Set the diopter adjustment on both eyepieces (or on eyepieces tubes) on the “0” position.

3. Select the lowest magnification objective and

Urea, a chemical indispensable for life

Urea is an organic compound with the chemical formula CO(NH2)2. The molecule has two NH2 groups joined by a carbonyl (C=O) functional group. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the

Some ideas about Stereo Microscopes

A stereo microscope certainly is the most widespread type of microscope. From industrial QS applications to the biomedical field, from professional environments to amateur usage: no other type of light microscope can claim to have a similar appreciation.

This success is based on its characteristics:

• Low magnification
• 3-D image
• True sided image
• No sample preparation needed

Especially in educational environments, there is no better instrument to take the first steps into the “world of small things”. Sample preparation for a regular transmitted light microscope is often associated with