The Role of the Syllable Contact Law-Semisyllable (SCL-SEMI) in the Coda Clusters of Najdi Arabic and Other Languages

Final consonants in Arabic are semisyllables; that is, moraic unsyllabified segments that are attached to the prosodic word (Kiparsky, 2003). If this is the case, optional vowel epenthesis in Najdi Arabic final clusters cannot be attributed to violations of the Sonority Sequencing Principle, because sonority restrictions apply within syllables only. In a new perspective, this dissertation argues that the existence of vowel epenthesis in Najdi coda clusters that have rising sonority, and its absence in clusters that have a falling sonority, are instead due to violations of the Syllable Contact Law (SCL), where sonority must drop between syllable codas and the following onset. It specifically argues that SCL is further divided into two sub-constraints where it not only applies across two syllables (SCL-SYLL), but also across syllables and the following unsyllabified semisyllable (SCL-SEMI). The new constraint SCL-SEMI is shown to be operative in other languages and dialects of Arabic, as well, including German, Slovak, English and Jordanian Arabic. Optionality of vowel epenthesis when words are produced in isolation vs. followed by a vowel-initial suffix is accounted for by adopting the Reversible Ranking Strategy introduced by Lee (2001) where the two constraints DEP-IO and SCL-SEMI are reversed following this ranking: *CCC, MAX-IO, ONSET \u3e\u3e ALIGNR\u3e\u3e DEP-IO, SCL-SEMI \u3e\u3e SCL-SYLL, *CXCOD. In addition, a psycholinguistic study is conducted to test the perception and production of ten Najdi speakers to observe whether they epenthesized a vowel into nonsense words with final rising-sonority clusters. It also investigates the generalizability of the semisyllable consistutent, by asking whether Najdi listeners will assign semisyllable status to any unsyllabifiable consonant, even those occurring in nonsense words. Results show that most participants apply their preferred vowel epenthesis pattern to nonesense words, which reflects their implicit knowledge of this pattern. Results also show a harmony effect where inserted vowels copy stem vowels

SARS-CoV-2 vaccination modelling for safe surgery to save lives: data from an international prospective cohort study

Background: Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. Methods: The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18-49, 50-69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. Results: NNVs were more favourable in surgical patients than the general population. The most favourable NNVs were in patients aged 70 years or more needing cancer surgery (351; best case 196, worst case 816) or non-cancer surgery (733; best case 407, worst case 1664). Both exceeded the NNV in the general population (1840; best case 1196, worst case 3066). NNVs for surgical patients remained favourable at a range of SARS-CoV-2 incidence rates in sensitivity analysis modelling. Globally, prioritizing preoperative vaccination of patients needing elective surgery ahead of the general population could prevent an additional 58 687 (best case 115 007, worst case 20 177) COVID-19-related deaths in 1 year. Conclusion: As global roll out of SARS-CoV-2 vaccination proceeds, patients needing elective surgery should be prioritized ahead of the general population