Normal patterning of tissues and organs requires the tight restriction of signaling molecules to well-defined organizing centers. In the limb bud, one of the main signaling centers is the zone of polarizing activity (ZPA) that controls growth and patterning through the production of sonic hedgehog (SHH). The appropriate temporal and spatial expression of Shh is crucial for normal limb bud patte...

Cell cycle arrest can be imposed by inactivating the anaphase promoting complex (APC). In S. cerevisiae this arrest has been reported to stabilize a metaphase-like intermediate in which the nuclear envelope spans the bud neck, while chromatin repeatedly translocates between the mother and bud domains. The present investigation was undertaken to learn how other features of nuclear organization a...

BACKGROUND Mucus hypersecretion from airway epithelium is a characteristic feature of airway inflammatory diseases. Tumor necrosis factor α (TNF-α) regulates mucin synthesis. Glucocorticoids including mometasone fuorate (MF) have been used to attenuate airway inflammation. However, effects of MF on mucin production have not been reported. METHODS Effects of MF and budesonide (BUD) on the phor...

The RNA base analogues, 2-thiouracil, 6-azauracil and 8-azaguanine incorporated singly into the medium, increased the number of floral buds in excised stem segments of Nicotiana tabacum variety Wisconsin No. 38 cultured in vitro. Combined treatments with 2 and 3 base analogues were even more effective. The effects were prevented by the corresponding natural counterparts, uracil, uridine, and gu...

In the developing axial skeleton, sequential sonic hedgehog (SHH) and bone morphogenetic protein (BMP) signals are required for specification of a chondrogenic fate in presomitic tissue. A similar paradigm is thought to operate in the limb, but the signals involved are unclear. To investigate the nature of these signals, we examined BMP action in mesenchymal populations derived from the early m...

An efficient In vitro protocol was established for callogenesis from various plant parts (Leaf, stem, flower bud and tendril) of Passiflora vitifolia Kunth. On Murashige Skoog (MS) basal medium supplemented with concentration auxins (NAA, IAA, 2,4-D) cytokinins (BAP Kn ). Different concentrations (0.5 to 4 mg/L), IAA 2mg/L), NAA 2 mg/l) cytokinin BAP mg/L) were assessed callus induction. Growth...

The influence of temperature, shoot age, and medium on gall induction by Subanguina picridis on Russian knapweed (Acroptilon repens) was examined in vitro. The optimal temperature for gall formation was 20 C. Gall induction was delayed as the temperature decreased, and decreased as shoot age increased. Bud primordia (0-day-old shoots and 5-day-old shoots) with an average length of 4.2 mm and 7....

mice. In particular, these types of studies have been performed using animals that have disrupted gustatory University of Denver Denver, Colorado 80208 innervation due to the lack of a particular neurotrophin, brain-derived neurotrophic factor (BDNF), or its principal receptor, trkB. BDNF is expressed in developing taste For the past century, studies of the development of taste papillae (Nosrat...