Use of eye lens diameter and weight as an age indicator in the carangid fish, Decapterus russelli (Pisces: Carangidae) from Gulf of Oman: preliminary observation

Specimens of Decapterus russelli have been collected from Lema, north of the Gulf of Oman. The ocular lens diameter and weight were tested as an additional age indicator to those already in use. The results showed that this technique could be adopted for determining the age of the species Decapterus russelli when the specimens are in the second year of age in case of eye lens diameter. On the other hand, eye lens weight failed to separate between the four age groups observed. The method is especially useful for age determination when otolith or scale ring are not visible or when false rings give erroneous reading

DIJAMETAR I MASA OČNE LEĆE KAO INDIKATOR STAROSTI Leiognathus equulus SAKUPLJENIH IZ MORA OMANA

In the leiognathid fish, Leiognathus equulus the diameter of the eye lens can be used for identifying first-year animals, while the eye lens weight proved unreliable for age determination.Kod vrste, Leiognathus equulus korišten je dijametar očne leće za određivanje jednogodišnjih organizama, dok se masa očne leće nije mogla uzeti kao pouzdana za određivanje starosti

The origin of fracture in the I-ECAP of AZ31B magnesium alloy

Magnesium alloys are very promising materials for weight-saving structural applications due to their low density, comparing to other metals and alloys currently used. However, they usually suffer from a limited formability at room temperature and low strength. In order to overcome those issues, processes of severe plastic deformation (SPD) can be utilized to improve mechanical properties, but processing parameters need to be selected with care to avoid fracture, very often observed for those alloys during forming. In the current work, the AZ31B magnesium alloy was subjected to SPD by incremental equal-channel angular pressing (I-ECAP) at temperatures varying from 398 K to 525 K (125 °C to 250 °C) to determine the window of allowable processing parameters. The effects of initial grain size and billet rotation scheme on the occurrence of fracture during I-ECAP were investigated. The initial grain size ranged from 1.5 to 40 µm and the I-ECAP routes tested were A, BC, and C. Microstructures of the processed billets were characterized before and after I-ECAP. It was found that a fine-grained and homogenous microstructure was required to avoid fracture at low temperatures. Strain localization arising from a stress relaxation within recrystallized regions, namely twins and fine-grained zones, was shown to be responsible for the generation of microcracks. Based on the I-ECAP experiments and available literature data for ECAP, a power law between the initial grain size and processing conditions, described by a Zener–Hollomon parameter, has been proposed. Finally, processing by various routes at 473 K (200 °C) revealed that route A was less prone to fracture than routes BC and C

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Thermal conductivity of polyatomic gases

SIGLEAvailable from British Library Document Supply Centre-DSC:DXN048144 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

ASYMMETRY ANALYSIS STUDY ON Callionymus margaretae REGAN, 1906 COLLECTED FROM THE ARABIAN SEA COASTS OF OMAN

Asymmetry analyses have been carried out for some bilateral characters of Callionymus margaretae Regan, 1906 collected from the Arabian Sea coasts of Oman. The results showed that the level of asymmetry of the character postorbital length was the highest among those asymmetry values obtained for the remaining characters studied. The lowest value was that for the head length. An increasing trend in the asymmetry value with fish length is also obtained for preorbital and postorbital lengths. The possible cause of the asymmetry in this species is herein discussed in relation to different pollutants and their presence in the area

ANALIZA ASIMETRIJE CALLIONYMUS MARGARETAE REGAN, 1906 SAKUPLJENIH UZ OBALU ARAPSKOG MORA U OMANU

Asymmetry analyses have been carried out for some bilateral characters of Callionymus margaretae Regan, 1906 collected from the Arabian Sea coasts of Oman. The results showed that the level of asymmetry of the character postorbital length was the highest among those asymmetry values obtained for the remaining characters studied. The lowest value was that for the head length. An increasing trend in the asymmetry value with fish length is also obtained for preorbital and postorbital lengths. The possible cause of the asymmetry in this species is herein discussed in relation to different pollutants and their presence in the area.Analize asimetrije riba provedene su na primjercima Callionymus margaretae Regan, 1906 sakupljenima uz obalu Arapskog mora u Omanu. Rezultati istraživanja pokazali su da su vrijednosti postorbitalne dužine bile najviše između vrijednosti dobivenih prema ostalim značajkama. Najniža je vrijednost bila za dužinu glave. Povećanje trenda vrijednosti asimetrije zabilježeno je za preorbitalnu i postorbitalnu dužinu. U radu se raspravlja o mogućem uzroku asimetrije kod riba u odnosu na različita onečišćenja i njihovu prisutnost u tom području