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Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Population Studies Of Migratory Birds In Virgin Islands National Park, Robert A. Askins, David N. Ewert
Population Studies Of Migratory Birds In Virgin Islands National Park, Robert A. Askins, David N. Ewert
Biology Faculty Publications
The majority of the individual songbirds nesting in the deciduous forests of eastern North America migrate to the West Indies, Central America and South America during the winter. They typically spend more than six months in tropical winter habitats. Until recently relatively little was known about their habitat requirements during the winter, but increasing concern about declining pcpulations of many migratory songbirds combined with widespread alarm about the rapid destruction of tropical forests has led to a flurry of research on this subject (Terborgh, 1989; Askins et al. 1990). In 1987 we initiated a study of the ecology and behavior …
A Survey Of Mucilaginous Testa In Chamaesyce, Martha S. Jordan, W. John Hayden
A Survey Of Mucilaginous Testa In Chamaesyce, Martha S. Jordan, W. John Hayden
Biology Faculty Publications
Seeds of Chamaesyce were studied for presence of mucilaginous testa. Samples were selected to represent all major systematic sections within the genus. Observations were made with a dissecting microscope following brief hydration of seeds; additional SEM observations of both intact and fractured dry seeds were made for selected species. With few exceptions, most of Boissier's subsections test positively for seed mucilage; however, mucilage is generally absent in subsections Gymnadeniae and "Sclerophyllae", for which absence of mucilage is regarded as secondary loss from mucilagionus ancestors. Although mucilage production is associated with a well-defined subepidermal layer of macroesclereids, it is …
Forest Fragmentation And The Decline Of Migratory Songbirds, Robert A. Askins
Forest Fragmentation And The Decline Of Migratory Songbirds, Robert A. Askins
Biology Faculty Publications
No abstract provided.
A New Family Of Heparin Binding Growth/Differentiation Factors: Differential Expression Of The Midkine (Mk) And Hb-Gam Genes During Mouse Development, Masaru Nakamoto, Shyuichiro Matsubara, Teruo Miyauchi, Hiroya Obama, Takashi Muramatsu
A New Family Of Heparin Binding Growth/Differentiation Factors: Differential Expression Of The Midkine (Mk) And Hb-Gam Genes During Mouse Development, Masaru Nakamoto, Shyuichiro Matsubara, Teruo Miyauchi, Hiroya Obama, Takashi Muramatsu
Biology Faculty Publications
MK (midkine) and HB-GAM (heparin-binding growth-associated molecule) constitute a new family of heparin-binding growth differentiation factors. The modes of expression of MK and HB-GAM during mouse development were quantitatively examined by mRNA hybridization. The following three distinct patterns of expression were observed in the brain/head region. On the 11th-13th days of gestation, MK was intensely, but HB-GAM relatively weakly expressed; on the 15th-19th days, both MK and HB-GAM expression became weaker; and in the neonatal period, HB-GAM was intensely expressed and MK expression increased slightly. The level of HB-GAM expression was lower than that of MK in the whole embryo …
Status Of Platanthera Praeclara Sheviak & Bowles (Western Prairie Fringed Orchid) In The Platte River Valley In Nebraska From Hamilton To Garden Counties, Tanya E. Bray, Barbara L. Wilson
Status Of Platanthera Praeclara Sheviak & Bowles (Western Prairie Fringed Orchid) In The Platte River Valley In Nebraska From Hamilton To Garden Counties, Tanya E. Bray, Barbara L. Wilson
Biology Faculty Publications
During June and July, 1991, a search for western prairie fringed orchid was conducted in the Platte River Valley in central and west-central Nebraska. No orchids were found in the 370 sites surveyed. Factors which may contribute to the scarcity of this orchid in the area surveyed include drought conditions in the previous three years; habitat alteration by draining, ditching, herbicide application, mowing for hay, crop cultivation and planting of non-native species for hay fields; invasion of the area by trees; and the presence of alkaline soils in some areas
Metabolite Production By Entomopathogenic Fungi, Donald W. Roberts, Raymond J. St. Leger, Sandeep Gupta
Metabolite Production By Entomopathogenic Fungi, Donald W. Roberts, Raymond J. St. Leger, Sandeep Gupta
Biology Faculty Publications
The entomopathogenic fungi produce a wide assortment of metabolites, some of which are important to the host-specialization of this group of fungi. Very few entomopathogenic fungi have been examined in detail for their metabolites in the disease process. Nevertheless, it is clear that certain proteases and lipases are crucial to the invasion of insect cuticle by the fungus. These fungi have the unusual ability to hydrolyze branched alkanes. Also, they normally produce very active, broad-spectrum proteases. These are needed for penetration of the hydrophobic epicuticle and the highly proteinaceous cuticle of insects. Chitinases also are involved, but usually have only …
Individualistic Perspectives On Plant Competition, Nancy J. Huntly
Individualistic Perspectives On Plant Competition, Nancy J. Huntly
Biology Faculty Publications
No abstract provided.