Internal and surface structures of asci and ascospores were studied by transmission electron microscopy (TEM) and by scanning electron microscopy (SEM) to establish the character and number of ascospores within the ascus of Metschnikowia krissii. Enzyme digestion with snail gut enzymes and SEM examination suggested the presence of a single ascospore enclosed in a thick sheath of epiplasmic mate...

A new species of Cataractispora, C. receptaculorum, is described from freshwater habitats. This species is characterized by triseptate verruculose ascospores and polar appendages that unfurl in water. The ascospores lack polar chambers that enclose the appendages as in C. bipolaris and C. viscosa. An ultrastructural study of this species revealed that the ascus wall and apical ring of this spec...

In the last two decades, the cervical cancer puzzle has become a coherent description that includes the identification of human papillomavirus (HPV) as the sexually transmitted etiologic agent and the characterization of the major determinants of HPV acquisition. Triage studies have consistently shown that HPV testing is more sensitive that repeated cytology in identifying underlying high-grade...

N yeast, as in other organisms where tetrad analysis is feasible, it is possible to Idetermine the distance between a given gene and the centromere of its chromosome. This may be accomplished directly if the relationship of the spores in the ascus is known. Two such relationships have been demonstrated. In the four-spored asci of Schizosaccharomyces pombe, the two spores at each end of the ascu...

Electron microscopy shows that ascomata of Myxotricum arcticum bear a striking resemblance to discocarps in morphogenesis and in previously overlooked aspects of gross morphology. Although mature ascomata of M. arcticum superficially resemble reticuloperidial cleistothecia common in the Onygenales, the bramble-like aggregation of thick-walled hyphae, previously considered to represent a closed ...

Specimen Adequacy TBS 1991 reported the adequacy of cervical cytology preparations in three categories: “satisfactory,”“unsatisfactory,”and “satisfactory but limited by,” or SBLB. SBLB included factors such as the lack of transformation zone components and the presence of partially obscuring factors (i.e., blood or inflammation). This category was confusing to some clinicians and prompted unnec...

The present study describes for the first time a case of primary lung squamous cell carcinoma with multiple skin metastases in a 7-year-old Lary breed cock. On physical examination, multiple, firm, mobile, ulcerative nodules, 3 to 4 cm in diameter were observed on the neck. Atypical squamous cells were observed in the skin fine needle aspiration. Histopathologically, variably sized masses of co...

Equations expressing the theoretical frequencies of twelve ascus-types in the tetrad analysis of a triply heterozygous diploid are described. Using these equations, a mapping procedure for a gene X, is proposed. The procedure requires that two genes, X and Y, of the same phenotype be heterozygous and that the map position of Y be known, and that another standard gene, Z, show an independent phe...