ABSTRACT OBJECTIVE To study the attitudes of Iranian medical students towards the do-not-resuscitate (DNR) decision. METHODS In this cross-sectional study, 220 medical students (110 interns and 110 residents) of Tehran University of medical sciences were selected. They asked to answer to the questionnaire which included two items: first item consisted of demographic questions (age, sex, an...

Three bottom trawl surveys over the northern continental slope in South China Sea (18°50′–20°40′N, 112°50′–115°10′E) were carried out, June 2015, March 2017 and September 2018, to investigate species composition, biodiversity community structure of demersal fish. Surveys 2018 captured 97 fish (representing 77 genera, 52 families, 26 orders), 108 84 61 19 orders) 126 105 74 25 respectively. a to...

Ricklefs and Renner (1) published a highly stimulating paper that compared orders, families, and genera of trees present in tropical Asia, Africa, and America. Both total abundance and number of species in orders and families were found to be significantly correlated among continents, but neither correlation was significant for genera (1). Ricklefs and Renner (1) concluded that the intercontine...

The Itapecuru is a relatively large river in the northeastern Brazilian state of Maranhão. During several expeditions to this basin, we collected 69 fish species belonging to 65 genera, 29 families and 10 orders. Characiformes and Siluriformes were the orders with the largest number of species and Characidae, Loricariidae, Cichlidae, Auchenipteridae and Pimelodidae were the richest families. Ab...

To illustrate the essential role of Apis cerana Fabricius in plant pollination, a survey was conducted using PCR, DNA barcoding, and high-throughput sequencing technologies to assess diversity plants foraged by A. at five sites around Qinling Mountains. A fragment rbcL gene pollen isolated from honey collected each site amplified sequenced. The results show that samples BJ TC, FP AK have high c...

For any simple graph G, let D(G) denote the degree set {degG(v) : v ∈ V (G)}. Let S be a finite, nonempty set of positive integers. In this paper, we first determine the families of graphs G which are unicyclic, bipartite satisfying D(G) = S, and further obtain the graphs of minimum orders in such families. More general, for a given pair (S, T ) of finite, nonempty sets of positive integers of ...