We describe a perithecial, pleomorphic ascomycetous fungus from the Early Devonian (400 mya) Rhynie chert; the fungus occurs in the cortex just beneath the epidermis of aerial stems and rhizomes of the vascular plant Asteroxylon. Perithecia are nearly spherical with a short, ostiolate neck that extends into a substomatal chamber of the host plant; periphyses line the inner surface of the ostiol...

When normally haploid yeast cells of two different mating types encounter each other, they fuse to form a diploid zygote (this constitutes a cross), which immediately undergoes meiosis to regenerate four individual haploid spores – a tetrad (the equivalent of an F1 generation). Since each meiotic tetrad is contained in a sac-like structure called an ascus, it can be recovered as an intact group...

Ascus formation in Debaryomyces hansenii includes fusion of two cells, usually mother and daughter while still attached to each other, through short protuberances developed from the cross wall between them. Nuclear fusion takes place in the channel connecting the two cells; meiosis apparently occurs in the mother cell. Generally, only one lobe of the meiotic nucleus is surrounded by a prospore ...

Miller, Glendon R. (Southern Illinois University, Carbondale), Dan O. McClary, and Wilbert D. Bowers, Jr. Ultraviolet and phase microscopy of sporulating Saccharomyces. J. Bacteriol. 85:725-731. 1963.-During active growth, the cytoplasm of yeast cells is densely absorbent to ultraviolet light at 260 mmu, whereas the nucleus is only faintly so, and the vacuole is nonabsorbent. After 24 hr on pre...

Immature asci of Coniochaeta tetraspora originally contain eight uninucleate ascospores. Two ascospore pairs in each ascus survive and mature, and two die and degenerate. Arrangement of the two ascospore types in individual linear asci is what would be expected if death is controlled by a chromosomal gene segregating at the second meiotic division in about 50% of asci. Cultures originating from...

Two species of Nitschkia are described from bark and wood of a legume shrub, native to the semiarid regions of Argentina. Nitschkia campylospora is characterized by asci with a variable number of ascospores, mainly 16, and curved ascospores; hairy ascomata and large ascospores are two distinct features of Nitschkia pilosa. The new species are compared with most similar species. A key to Nitschk...

Building upon psychological conflict theory, on the one hand, and item-response models, on the other, the present paper develops an integrated methodology that aims at differentiating the various ways of criticizing Israel. An application of this methodology to the Anti-Semitism and Criticism of Israel (ASCI) survey found two ways of criticizing Israel resulting from two different and antipodal...

The aim of this study was to investigate the role of E6/E7 mRNA in discriminating patients who were high-risk human papilloma virus-positive associated with cytology-negative and Atypical Squamous Cells of Undetermined Significance (ASCUS). This study comprised of 380 women (age: >30 years) who were associated with high risk of cervical virus infection and they underwent simultaneous examinatio...

The fine structure of ascospore formation in the fission yeasts Schizosaccharomyces pombe and Schizosaccharomyces japonicus var. japonicus was studied by serial thin-sectioning and electron microscopy. The morphogenetic events were almost the same in both species. Ascospore development was initiated by the formation of the forespore membrane on the cytoplasmic side of the differentiated nucleus...