Wednesday, 22 November 2017

Basics of Light Microscopy 5 - About Plan Apos

For sure, a genuine rendition of color is a basic demand on any light microscope. Using white light as the inspection tool for microscopic samples causes a high challenge on the microscope optics. Different wavelengths set different focal points, and this Chromatic Aberration (greek: χρωμα chroma = color and latin: aberrare = deviation) has to be compensated by combining lenses of different shape and different glass types.

In this sense, the Plan Apochromatic lens correction represents the highest level of color reproduction. Here the focal point for several wavelengths has been brought together by a clever combination of different lenses, resulting in a lack of colored fringes around phenomenon borders. 

Chromatic Aberration

Friday, 17 November 2017

Malaria

Malaria has been recognized since the Greek and Roman civilizations over 2,000 years ago, with different patterns of fever described by the early Greeks. Malaria is the most important tropical disease known to man. It remains a significant problem in many tropical areas, especially in sub-Saharan Africa. Malaria is spreading as a result of environmental changes, including global warming, civil disturbances, increasing travel and drug resistance. There are approximately 100 million cases of malaria worldwide with about 1 million of these proving fatal.

Friday, 3 November 2017

Gooseberries under attack


Powdery mildew (Sphaerotheca mors-uvae) severely infects young shoots, stems and fruits of gooseberry (Ribes uva-crispa). Environmental friendly and biological control measures are being sought throughout the world. Especially in organic currant growing, effective control measures are needed, because powdery mildew infections may result in a total loss of the crop. In organic currant growing the number of adequate control methods is very limited.

Thursday, 19 October 2017

What has microscopy to do with a beggar?

A connection really exists. Somewhere in the south of the Netherlands, on the estate of late professor Eugene Dubois, is a beautiful lake called 'The Bedelaar' or 'The Beggar'. In this lake, the aquatic micro life has been investigated using Motic microscopes. The movie tells about the results of this microscopic survey, supplemented by information about the professor, about his estate and the renowned hydro biologist Neele Wibaut.


So watch the movie and enjoy the footage of microscopically small underwater organisms.

Wednesday, 4 October 2017

When bitten by a tick

Relapsing fever is bacterial infection characterized by recurring episodes of fever, headache, muscle and joint aches, and nausea. It is caused by certain species of Borrelia spirochetes. which are transmitted through the bites of lice or soft-bodied ticks.


Friday, 29 September 2017

Quick microscope setup guide for Life Sciences inverted microscopes

SWITCH ON THE MICROSCOPE

Plug-in the microscope to the power supply (1). Switch it on (2) and gradually increase the light intensity up to the desired level (black wheel on the right side of the microscope) (3).



Wednesday, 27 September 2017

Cladonia coccifera


This cup lichen is common in forests, sand dunes and heathland. It grows between moss and grass and is about half a centimeter tall. It has a red-colored spore forming fruiting or apothecia.

Lichens are tough organisms which can survive on the most unlikely places, where plants cannot grow. For example, in the desert, in the Antarctic, in high mountains.

Wednesday, 20 September 2017

Pear rust and Junipers


Pear Rust is an increasingly common fungal disease in pear trees. This disease can significantly slow the growth of a pear tree, and the tree will also give less fruits. Pear Rust is a fungus that cannot stay the whole year on the pear: in winter the tree has no leaves and the fungus is only present there. In winter, the fungus needs a Juniper to overwinter. After the winter the fungus makes spores, which are spread through the air. The spores fall on the pear tree, causing the fungal disease.

Wednesday, 6 September 2017

Micro skeletons from the sea

Silicoflagellates belong to a small group of marine planktonic organisms with siliceous skeletons composed of opaline rods. Silicoflagellates are both photosynthetic and heterotrophic. The cell size ranges from 20 to 80 μm.



Their internal silica skeletons are composed of a network of bars, and resemble those of radiolarians but are generally much less complex. Silicoflagellate skeletons usually comprise 1-2% of the siliceous component of marine sediments; they are

Wednesday, 23 August 2017

Eating corn smut?


Common smut of corn, caused by Ustilago zeae (now known as U. maydis), is easily identified by tumor-like galls that form on actively growing host tissues and contain masses of dark, sooty teliospores.