HUBUNGAN ANTARA RISK PERCEPTION, PEERPRESURE, DAN PARENTING STYLE DENGAN RISK-TAKING BEHAVIOR PADA REMAJA AWAL

Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara risk perception, peer pressure, dan parenting style dengan risk-taking behavior.  Metode penelitian yang digunakan adalah kuantitatif korelasional dengan menggunakan uji statistik uji hubungan. Populasi penelitian adalah remaja awal di Surabaya dengan rentang usia 11-15 tahun. Subjek yang digunakan dalam penelitian ini adalah N=196. Berdasarkan hasil penelitian ditemukan bahwa ada hubungan yang negatif signifikan antara health risk perception dengan health risk-taking behavior (r =- 0.111, Sig= 0.03). Pada variabel lainnya yaitu peer pressure family involvement memiliki hubungan dengan exploratory risk-taking behavior (r= 0.156, Sig= 0.003), dan data hasil selanjutnya adalah ada hubungan yang signifikan antara peer pressure peerinvolvement dengan health risk-taking behavior (r= 0.144, Sig= 0.005).&nbsp

HUBUNGAN ANTARA RISK PERCEPTION, PEERPRESURE, DAN PARENTING STYLE DENGAN RISK-TAKING BEHAVIOR PADA REMAJA AWAL

Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara risk perception, peer pressure, dan parenting style dengan risk-taking behavior.  Metode penelitian yang digunakan adalah kuantitatif korelasional dengan menggunakan uji statistik uji hubungan. Populasi penelitian adalah remaja awal di Surabaya dengan rentang usia 11-15 tahun. Subjek yang digunakan dalam penelitian ini adalah N=196. Berdasarkan hasil penelitian ditemukan bahwa ada hubungan yang negatif signifikan antara health risk perception dengan health risk-taking behavior (r =- 0.111, Sig= 0.03). Pada variabel lainnya yaitu peer pressure family involvement memiliki hubungan dengan exploratory risk-taking behavior (r= 0.156, Sig= 0.003), dan data hasil selanjutnya adalah ada hubungan yang signifikan antara peer pressure peerinvolvement dengan health risk-taking behavior (r= 0.144, Sig= 0.005).&nbsp

The Sustainability of Dental Calculus for Archaeological Research

Dental calculus is a mineralized plaque biofilm formed by microbiota of the oral microbiome. Until recently, the vast research potential of dental calculus for archaeological study was not fully appreciated and it was often discarded. It is now recognized that dental calculus entombs and preserves valuable microfossils and biomolecules within its matrix. While microscopic and bimolecular analysis of calculus is destructive, judicious sampling of relatively small quantities of material can provide unique information on ancient health and diet. Additionally, dental calculus is not classified as human tissue, but as an ectopic growth, and in some cases may provide an alternative approach to the destructive analysis of human skeletal remains. We present a case study recovering proteins, DNA and microscopic debris from Roman Age individuals to demonstrate the important insights into diet, health and disease that can be obtained from even minute quantities of dental calculus

HUBUNGAN ANTARA RISK PERCEPTION, PEERPRESURE, DAN PARENTING STYLE DENGAN RISK-TAKING BEHAVIOR PADA REMAJA AWAL

Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara risk perception, peer pressure, dan parenting style dengan risk-taking behavior.  Metode penelitian yang digunakan adalah kuantitatif korelasional dengan menggunakan uji statistik uji hubungan. Populasi penelitian adalah remaja awal di Surabaya dengan rentang usia 11-15 tahun. Subjek yang digunakan dalam penelitian ini adalah N=196. Berdasarkan hasil penelitian ditemukan bahwa ada hubungan yang negatif signifikan antara health risk perception dengan health risk-taking behavior (r =- 0.111, Sig= 0.03). Pada variabel lainnya yaitu peer pressure family involvement memiliki hubungan dengan exploratory risk-taking behavior (r= 0.156, Sig= 0.003), dan data hasil selanjutnya adalah ada hubungan yang signifikan antara peer pressure peerinvolvement dengan health risk-taking behavior (r= 0.144, Sig= 0.005).&nbsp

The exploitation of wild plants in Neolithic North Africa. Use-wear and residue analysis on non-knapped stone tools from the Haua Fteah cave, Cyrenaica, Libya

The North African region offers up essential data for the study of the origins of the earliest forms of plant exploitation. Data available from several Saharan and coastal areas in the region have revealed that the arrival of domestic wheat and barley from the Levant during the Mid Holocene did not replace the exploitation of autochthonous wild plants, especially grasses. The Neolithic layers of the Haua Fteah cave, in Cyrenaica (Northern Libya), have so far produced archaeobotanical assemblages exclusively made up of wild species. This paper investigates production and use of non-knapped stone tools, mainly grinding stones, from the Holocene sequence of the Haua Fteah Cave. The presence of grinding stones may indicate a certain level of behavioural change and the adoption of new economic strategies, relying more strongly on plant exploitation. This assumption has been tested using an integrated approach of use-wear and residue analysis. These methods allowed us to obtain significant new information as to how tools were originally used. Use-wear analysis was carried out adopting a low power approach; such study was complemented by residue analysis, in particular starch granules analysis, only rarely applied in North African contexts. This combined approach was carried out on a selected sample of tools, in order to test survival of plant micro-remains and, where possible, the types of plants processed by the Holocene communities in the cave. Here we confirm the lack of evidence of domesticated crops and the presence of starch granules only belonging to wild plants. The importance of wild plants in the economy of North African prehistoric groups has often been underestimated, on the assumption that they were replaced by the Near Eastern domesticated crops and animals once they were firstly introduced in North Africa. The results of our study show a different picture, confirming the role of the wild species as an important food source during the Holocene.his research was conducted as a part of the Marie Skłodowska-Curie Project FP7-People-2012-IEF ‘AGRINA’, funded by the European Commission. We gratefully acknowledge the permission and support of the Department of Antiquities of Libya to undertake the Cyrenaican Prehistory Project and the financial support from the European Research Grant (grant number 230421) and the Society for Libyan Studies.This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/10.1016/j.quaint.2015.11.10

Heteroaromatization with 4-phenyldiazenyl-1-naphthol. Part I: Synthesis of some new naphthopyrans and naphthopyranopyrimidines

Reaction of 4-phenyldiazenyl /or 4-(p-tolyldiazenyl)-1-naphthol (1) with various substituted α-cyanocinnamonitriles (2a-h) and ethyl α-cyanocinnamates (2i-p) afforded 2-amino-4-(aryl)-6-(phenyldiazenyl /or p-tolyldiazenyl)-4H-naphtho[1,2-b]pyrano-3-carbonitrile (3a-h) and ethyl 2-amino-4-(aryl)-6-(phenyldiazenyl /or p-tolyldiazenyl)-4H-naphtho[1,2-b]pyrano-3-carboxylate (3i-p). Reaction of compound 3a with Ac2O or PhCOCl and formic acid afforded N-acetylamino or N,N-dibenzoylamino and naphthopyranopyrimidine derivatives (4-8), respectively. The structures of these compounds were established on the basis of IR, UV, 1H NMR, 13C NMR, and MS data

The application of 3D modeling and spatial analysis in the study of groundstones used in wild plants processing

In recent years, several works have proved the reliability of the application of 3D modeling and spatial analysis in the study of stone tool use. Monitoring surface morphometry resulting from the use of lithic tools has the potential to objectively quantify and identify patterns of modifications associated to specific activities and worked materials. In particular, the combination of surface morphometry with a systematic experimental framework and use wear analysis has the potential of foreseeing residue distribution areas over the groundstone surfaces, hence providing a key aid in establishing sampling strategies applied to archeological specimens. Here, we propose an approach that applies 3D modeling, performed through a close-range photogrammetry, and the use of GIS software to investigate surface modifications and residue distribution on groundstones used to process wild plants. Our work comprises a dedicated experimental framework in which modern tool replicas have been used to process different species of wild plant foods through grinding, crushing, and pounding. By applying 3D modeling and spatial analysis, we were able to characterize patterns of surface modifications related to each of the worked substances and activities performed. Moreover, we monitored the distribution of starch granules over the experimental groundstone surfaces and its variation in relation to the state of the worked substance and the action carried out. Our results provide one of the first experimental dataset focused on the use of groundstones for wild plant processing, and a reliable methodology for further studies related to the exploitation of stone technology and wild vegetal substances in the past

Plant, pigment, and bone processing in the Neolithic of northern Arabia-New evidence from Use-wear analysis of grinding tools at Jebel Oraf

Archaeological sites with surface hearths are a ubiquitous feature across the arid zones of the Arabian interior. At Jebel Oraf, in the Jubbah basin of the Nefud Desert of northern Arabia, numerous grinding stone fragments were found in association with hearths, though the original purpose of these stones was unclear owing to the poor preservation of faunal and botanic remains. Here we describe results from use-wear analysis on five grinding tools at Jebel Oraf, demonstrating that such artefacts were used during the Neolithic for plant processing, bone processing, and pigment production. Grinding stones were often broken up after initial use and fragments were subsequently re-used for alternative purposes, before finally being placed on hearths or discarded. More specifically, plants were ground or prepared and possibly cooked in the hearths, and bones were processed as well. The analyses also highlight the importance of pigment processing at Neolithic sites and provide a link to painted rock art. The frequent use of pigment in the archaeological record suggests that pigment was widely used, and that Neolithic painted art may have been more common than the surviving images suggest

ANALISIS MORFOLOGI DAN FILOGENETIK MOLEKULER ALGA HIJAU COCCOID YANG DIISOLASI DARI PULAU ENGGANO

A combined of morphological characters and molecular approach, is important for evaluating the current classification of microalgae. Phylogenetic trees based on 18S rDNA gene sequence analysis provide useful tools to distinguish between inter- and intra-specific morphologically similar species of coccoid green algae. The aim of the study was to compare the morphological characters and conduct molecular analysis of coccoid green algae isolated from Enggano Island, located southwest of Sumatera, Indonesia. Coccoid green algae samples were collected from different sites at Enggano Island by using a simple random sampling. The single algae were isolated and transferred to IMK medium in flasks by using microcapillaries method. The morphological characteristics of green algae were observed under culture conditions using light microscopy and the phylogenetic positions of the isolated strains were defined according to the 18S rDNA gene sequences. According to homology search (BLAST) and phylogenetic tree analysis, four of the isolated coccoid green algae possessed high sequence similarity, ranging between 90-100%, to Chlorellavulgaris, Auxenochlorella protothecoides, Miractinium reisseri, and Micractinium balenophorum