Crystal formation in cultures of fungi: Dermatophytes and other Hyphomycetes

Summary The present study calls attention to crystal formations in cultures of Dermatophytes and other Hyphomycetes.The reasons for the late discovery of crystal formations in fungus cultures are discussed.The diverse crystallographic forms found up to date in cultures of fungi enumerated are described and illustrated.

---

Zusammenfassung Die gegenwärtige Untersuchung lenkt die Aufmerksamkeit auf die Krystallbildung in Kulturen von Dermatophyten und anderen Hyphomyceten.Die Gründe für die späte Entdeckung von Krystallbildungen in Pilzkulturen werden erörtert.Die verschiedenen krystallographischen Formen, die bisher in Pilzkulturen gefunden worden sind, werden beschrieben und illustriert.

---

Résumé La présente étude informe sur la formation des crystaux dans les cultures des dermatophytes et d'autres hyphomycètes.Les raisons pour la découverte tardive des formations des crystaux dans les cultures des cryptogames sont discutées.Les diverses formes crystallographiques trouvées dans les cultures cryptogamiques ont été décrites et illustrées.

---

---

Presented with demonstration at the mid-winter meeting of the Chicago Medical Mycological Society, February 15, 1961.     

Insulin resistance does not impair contractile responses of cerebral arteries

Insulin resistance (IR) impairs endothelium-mediated vasodilation in cerebral arteries as well as K+ channel function in vascular smooth muscle. Peripheral arteries also show an impaired endothelium-dependent vasodilation in IR and concomitantly show an enhanced contractile response to endothelin-1 (ET-1). However, the contractile responses of the cerebral arteries in IR have not been examined systematically. This study examined the contractile responses of pressurized isolated middle cerebral arteries (MCAs) in fructose-fed IR and control rats. IR MCAs showed no difference in pressure-mediated (80 mmHg) vasoconstriction compared to controls, either in time to develop spontaneous tone (control: 61+/-3 min, n=30; IR: 63+/-2 min, n=26) or in the degree of that tone (control: 60 min: 33+/-2%, n=22 vs. IR 60 min: 34+/-3%, n=17). MCAs treated with ET-1 (10(-8.5) M) constrict similarly in control (53+/-3%, n=14) and IR (53+/-3%, n=14) arteries. Constrictor responses to U46619 (10(-6) M) are also similar in control (48+/-9%, n=8) and IR (42+/-5%, n=6) MCAs as are responses to extraluminal uridine 5'-triphosphate (UTP; 10(-4.5) M) (control: 35+/-7%, n=11 vs. IR: 38+/-3%, n=10). These findings demonstrate that constrictor responses remain intact in IR despite a selective impairment of dilator responses and endothelial and vascular smooth muscle K+ channel function in cerebral arteries. Thus, it appears that the increased susceptibility to cerebrovascular abnormalities associated with IR and diabetes (including cerebral ischemia, stroke, vertebrobasilar transient ischemic attacks) is not due to an enhanced vasoreactivity to constrictor agents.