Surfactant-controlled composition and crystal structure of manganese(II) sulfide nanocrystals prepared by solvothermal synthesis.

We investigated how the outcome of the solvothermal synthesis of manganese(II) sulfide (MnS) nanocrystals (NCs) is affected by the type and amount of long chain surfactant present in the reaction mixture. Prompted by a previous observation that a larger than stoichiometric amount of sulfur is required [Puglisi, A.; Mondini, S.

Tunability of exchange bias in Ni@NiO core-shell nanoparticles obtained by sequential layer deposition.

Films of magnetic Ni@NiO core-shell nanoparticles (NPs, core diameter d ≅ 12 nm, nominal shell thickness variable between 0 and 6.5 nm) obtained with sequential layer deposition were investigated, to gain insight into the relationships between shell thickness/morphology, core-shell interface, and magnetic properties. Different values of NiO shell thickness t(s) could be obtained while keeping the Ni core size fixed, at variance with conventional oxidation procedures where the oxide shell is grown at the expense of the core.

Investigation on atmospheric pollen in a plain zone of Romania.

In May-August 1982 and April-August 1983 quantitative and qualitative studies on the atmospheric pollen were carried out in the town of C. using Durham's method. The number of total atmospheric pollen granules was found to exceed 1,200/sq.

Frequency of certain allergens in allergic bronchial asthma.

The frequency of some allergens involved in allergic bronchial asthma was studied in a group of 1177 patients who came for medical investigations to the Department of Allergy of the "N. Gh. Lupu" Institute of Internal Medicine--Bucharest between January 1980 and January 1982.

The frequency of allergens implicated in bronchial asthma in different areas of Romania.

The study carried out on 582 asthma patients and 164 healthy controls, ranging in age from 5 to 60 years, dwelling in four different towns ( Sibiu , Mediaş, Baia Mare, Sighetul Marma tiei ) showed that the most frequently involved antigen in allergic bronchial asthma was house dust (50.3 to 86%), followed by Dermatophagoides pteronissinus and atmospheric fungi, and the most frequently encountered associations were likewise between these allergens, hence the orientation towards a specific hyposensitizing therapy. In these localities with a rich gramineous vegetation there was a high per cent of sensitization to the polen of these plants.

The relationship between air-borne fungal spores and Dermatophagoides pteronyssinus in the house dust.

The prevalence of mould genera and their association with the house dust mite (Dermatophagoides pteronyssinus) were investigated in the homes of 192 asthmatic patients and 125 healthy people in a Romanian town with a relatively high degree of humidity. The dominant moulds which developed in the culture media exposed on the bedroom floors were Cladosporium, Penicillium and Aspergillus. Living Dermatophagoides pt.

Study of atmospheric fungi in a big cereal silo over a period of one year.

A quantitative and qualitative study of the atmospheric fungi in a big silo was carried out over a period of one year (April 1973--April 1974). About 6 to 12 Petri dishes with Czapek medium were exposed for 5 minutes every month at different floors of the silo. The study showed:--a very high number of fungi colonies, reaching as many as 903 in March 1974 (a total of 60 min exposure); the dominant fungus was penicillium which was, however, overpassed in certain months by aspergillus (flavus and fumigatus) which in May 1973 reached about twice the incidence of penicillium.