Foliar trichomes of gray-leaved Tillandsioideae (Bromeliaceae) are highly reflective, suggesting a role in protecting the leaf against direct sunlight in exposed niches. The performance of photosystem II, as denoted by the chlorophyll fluorescence characteristic Fv /Fm , was determined for seven Tillandsia species and Vriesea barclayana that were exposed to excessive light, with trichomes eithe...

The paper discusses the experimental and finite element investigation into the failure mechanisms of uniply graphite-epoxy composite plates with circular holes loaded in uniaxial compression. The effect of hole size on the failure mode is established. Test specimens composed of a single layer of uniply graphite-epoxy sandwiched between two layers of transparent polyetherimide plastic were desig...

This useful little book was written as a handbook for beginners. In simple, direct language the author presents the principles of image formation and their practical application in the optical microscope. Numerical aperture and resolution are discussed clearly and their importance to the microscopist is emphasized. Instructions for obtaining critical illumination and Kohler illumination are pre...

This useful little book was written as a handbook for beginners. In simple, direct language the author presents the principles of image formation and their practical application in the optical microscope. Numerical aperture and resolution are discussed clearly and their importance to the microscopist is emphasized. Instructions for obtaining critical illumination and Kohler illumination are pre...

Stereomicroscope The new Carl Zeiss stereomicroscope Stemi 2000-CS allows the user to view the sample whilst other observers view the procedure by video. Greenough type stereomicroscopes create their stereo effect by having separate light paths set at different angles, one for each eye. However, when video or photomicrography is being carried out most stereomicroscope systems remove light from ...

It was in a greenhouse in Oakland, California in 1989 that I began to question what I thought I knew about the use of transgenes in agriculture. I had been urged to look at some transgenic petunia plants by a company to which I was a scientific advisor. The plants in front of me had deep purple petals with many white segments. Some of the plants had all-white flowers. The white segments and the...

Stereomicroscope The new Carl Zeiss stereomicroscope Stemi 2000-CS allows the user to view the sample whilst other observers view the procedure by video. Greenough type stereomicroscopes create their stereo effect by having separate light paths set at different angles, one for each eye. However, when video or photomicrography is being carried out most stereomicroscope systems remove light from ...

Stereomicroscope The new Carl Zeiss stereomicroscope Stemi 2000-CS allows the user to view the sample whilst other observers view the procedure by video. Greenough type stereomicroscopes create their stereo effect by having separate light paths set at different angles, one for each eye. However, when video or photomicrography is being carried out most stereomicroscope systems remove light from ...

Newer methods of microscopy promise to provide a better insight into the physicochemical aspects of tissue structure than has been attained by conventional technics. An exploratory investigation is reported of the ultraviolet absorptive behavior of renal arterioles and arteries, employing the Polaroid color-translating ultraviolet microscope. In the arteriolar necrosis accompanying malignant hy...