Henry S. Lowendorf

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Neurospora crassa mutants resistant to 2-deoxyglucose have been isolated, and their mutations have been mapped to four genetic loci. The mutants have the following characteristics: (i) they are resistant to sorbose as well as to 2-deoxyglucose; (ii) they are partially or completely constitutive for glucose transport system II, glucamylase, and invertase,(More)
A study was conducted to determine whether the survival of Rhizobium phaseoli in acid soils could be predicted on the basis of the tolerance of the organism to acidity in culture. Of 16 strains tested, all grew in culture at pH 4.6, but only those that grew at pH 3.8 survived in soils having pH values of 4.1 to 4.6. Strains that tolerated the lowest pH(More)
Analyses of terrestrial sources of sodium and estimates of the sodium requirement of moose (Alces alces) on Isle Royale, Lake Superior, suggest that availability of the element controls the moose population. The terrestrial vegetation is very poor in the element, but, as elsewhere, submerged and floating leaved water-plants are relatively rich. Consumption(More)
A Rhizobium strain nodulating cowpeas did not decline in abundance after it was added to sterile soils at pH 6.9 and 4.4, and the numbers fell slowly in nonsterile soils at pH 5.5 and 4.1. A strain of R. phaseoli grew when added to sterile soils at pH 6.7 and 6.9; it maintained large, stable populations in soils of pH 4.4, 5.5, and 6.0, but the numbers fell(More)
In addition to the constitutive, low-affinity phosphate-transport system described previously, Neurospora possesses a second, high-affinity system which is derepressed during phosphorus starvation. At pH 5.8, System ii has a K1/2 of about 3muM and a Jmax of 5.2 mmol/1 cell water per min. System ii reaches maximal activity after about 2 h of growth in(More)
Phosphate transport system II, previously shown to be responsible for high-affinity phosphate uptake under conditions of phosphorus starvation, is regulated by at least three genes: pcon-nuc-2, preg, and nuc-1. nuc-1 and nuc-2 mutants cannot be derepressed for phosphate transport system II, while pconc and pregc mutants are partially constitutive.
of the available knowledge has been brought together under one cover in this excellent Ciba symposium. The picture that emerges is not simple, clear, or complete, but it is in a form that can be managed by a scientist from a related field. Seeming contradictions still exist as in the effect of actinomycin on interferon induction by endotoxin in the rabbit(More)
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