LZTR1 loss-of-function variants associated with café au lait macules with or without freckling.

Pathogenic variants in the leucine zipper-like transcriptional regulator 1 gene () have been identified in schwannomatosis and Noonan syndrome. Here, we expand the phenotype spectrum of variants. We identified four loss-of-function heterozygous variants in five children with multiple café au lait macules and one adult with multiple café au lait macules and axillar freckling, by applying gene panel analysis in four families.

Why has the bohr-sommerfeld model of the atom been ignoredby general chemistry textbooks?

Bohr's model of the atom is considered to be important by general chemistry textbooks. A major shortcoming of this model was that it could not explain the spectra of atoms containing more than one electron. In order to increase the explanatory power of the model, Sommerfeld hypothesized the existence of elliptical orbits.

[Urine analysis in a pediatric laboratory using reagent strips read visually (visual dip sticks)].

The Authors studied the possibility of using some dip sticks visual for urinalysis. One hundred of urine samples have been analyzed at the beginning with the instrumental laboratory analytical system and then with the dip sticks visual; the results put in evidence that there is a real discrepancy as far as glucose is concerned. Glucose is overestimated in dip sticks visual method.

[Emergency laboratory in the pediatric module].

The emergency in the laboratory is a serious problem. The Authors, starting from management evaluations, try to analyse the problems related to the urgent examinations in the Laboratory of a Pediatric Hospital. They propose executive ways for the best working of the same laboratory.

A possible role of prostaglandin E2 in reproduction of the male water frog, Rana esculenta. In vivo and in vitro studies.

Plasma prostaglandin E2 (PGE2), prostaglandin F2 alpha (PGF2 alpha), androgens and estradiol-17 beta were measured in the male water frog, Rana esculenta, during the annual sexual cycle. In vivo experiments were carried out to study the effects of PGE2 and PGF2 alpha on plasma sex steroids during the following periods: prereproduction (April), reproduction (May), postreproduction (June) and recovery (October). In the same months, in vitro experiments were performed to evaluate the effects of these two prostaglandins (PGs) on testicular release of sex steroids.