173,560 research outputs found
Keanekargaman Makrozoobentos Epifauna Pada Perairan Pulau Lae-Lae Makassar
No full textPenelitian dilakukan untuk mengetahui keanekaragaman makrozoobentos
epifauna pada perairan pulau Lae-lae Makassar. Metode yang digunakan pada
penelitian ini yaitu metode purposive sampling sehingga diperoleh 3 stasiun yaitu
stasiun I berada pada bagian barat pulau Lae-lae Makassar, stasiun II pada bagian
selatan dan stasiun III pada bagian timur. Teknik pengambilan sampel
makrozoobentos epifauna menggunakan metode line transect. Hasil penelitian
menunjukkan keanekaragaman makrozoobentos epifauna pada perairan pulau Lae-lae
Makassar diperoleh 2 kelas makrozoobentos yaitu Bivalvia dan Crustacea dengan
jumlah spesies 8 dan jumlah individu sebanyak 38. Indeks keanekaragaman (H') pada
stasiun I (1,08), stasiun II (1,56) dan stasiun III (1,41). Dari ketiga stasiun tersebut
nilai indeks keanekaragaman di kategorikan rendah. Keseragaman (E)
makrozoobentos epifauna pada stasiun I yaitu 0,98, stasiun II 0,97 dan stasiun III
0,87. Dari ketiga stasiun tersebut nilai indeks keseragaman termasuk kategori
komunitas stabil. Indeks dominansi (C) makrozoobentos epifauna makrozoobentos
pada stasiun I diperoleh nilai indeks dominansi yaitu 0,34, stasiun II 0,21 dan stasiun
III 0,27. Dari ketiga stasiun terebut di kategorikan dengan nilai indeks dominansi
yang tergolong rendah 0,00 < C < 0,50
KEANEKARAGAMAN MAKROZOOBENTOS EPIFAUNA PADA PERAIRAN PULAU LAE-LAE MAKASSAR
No full textPenelitian dilakukan untuk mengetahui keanekaragaman makrozoobentos epifauna pada perairan pulau Lae-lae Makassar. Metode yang digunakan pada penelitian ini yaitu metode purposive sampling sehingga diperoleh 3 stasiun yaitu stasiun I berada pada bagian barat pulau Lae-lae Makassar, stasiun II pada bagian selatan dan stasiun III pada bagian timur. Teknik pengambilan sampel makrozoobentos epifauna menggunakan metode line transect. Hasil penelitian menunjukkan keanekaragaman makrozoobentos epifauna pada perairan pulau Lae-lae Makassar diperoleh 2 kelas makrozoobentos yaitu Bivalvia dan Crustacea dengan jumlah spesies 8 dan jumlah individu sebanyak 38.Indeks keanekaragaman (H') pada stasiun I (1,08), stasiun II (1,56) dan stasiun III (1,41). Dari ketiga stasiun tersebut nilai indeks keanekaragaman di kategorikan rendah. Keseragaman (E) makrozoobentos epifauna pada stasiun I yaitu 0,98, stasiun II 0,97 dan stasiun III 0,87. Dari ketiga stasiun tersebut nilai indeks keseragaman termasuk kategori komunitas stabil. Indeks dominansi (C) makrozoobentos epifauna makrozoobentos pada stasiun I diperoleh nilai indeks dominansi yaitu 0,34, stasiun II 0,21 dan stasiun III 0,27. Dari ketiga stasiun terebut di kategorikan dengan nilai indeks dominansi yang tergolong rendah 0,00 < C < 0,50. Kata Kunci: Makrozoobentos, Epifauna, Keanekaragaman
Gated relational stacked denoising autoencoder with localized author embedding for global citation recommendation
No full textCitation recommendation is an effective and efficient way to facilitate authors finding desired references. This paper presents a novel neural network based model, called gated relational probabilistic stacked denoising autoencoder with localized author (GRSLA) embedding, for global citation recommendation task. Our model is comprised of two modules with different neural network architecture. For each citing and cited papers, we use a gated paper embedding module, which is extended from probabilistic stacked denoising autoencoder (PSDAE) by adding gated units, to obtain their paper vectors. The added gated units are able to utilize text information of cited paper to refine the vector representation of citing paper in multiple semantic levels. For an author in papers, we first apply topic model to obtain his/her semantic neighbors, and then use a localized author embedding (LAE) module to excavate author vector representation from semantic and explicit neighbors. Unlike most graph convolutional network (GCN) based methods, the LAE module is able to avoid computing global Laplacian in whole graph by taking limited neighbors. Moreover, the LAE module can also be stacked to absorb more neighbors, which makes our model have high extendibility. Based on the generation process of GRSLA, we also derive a learning algorithm of our model by maximum a posteriori (MAP) estimation. We conduct experiments on the AAN, DBLP and CORD-19 datasets, and the results show that GRSLA model works well than previous global citation recommendation methods
Skrining senyawa antibakteri dari caulerpa racemosa var. Macrophysa dan C. Sertulariooides (gmelin) howe asal perairan pulau lae-lae makassar
No full textPenelitian tentang Skrining Senyawa Antibaktri dari Caulerpa racemosa var. macrophysa dan Caulerpa sertularioides (Gmelin) Howe Asal Perairan Pulau Lae-Lae Makassar, yang bertujuan untuk mengisolasi dan mengidentifikasi senyawa antibakteri. Metoda penelitian meliputi penyarian dengan metoda maserasi menggunakan cairan penyari methanol dan heksan. Ekstrak dibuat dengan konsentrasi 10%, 1%, 0,1% dan DMSO (dImetil-sulfookksida) sebagai pengencer dan control negatif. Uji aktifitas antibakteri dari ke 2 ekstrak terhadap Staphylococcus aureus dan Salmonela thypi dilakukana dengan metode difusi pada medium Mueller-Hintonn Agar (MHA) dengan waktu inkubasi 1 x 24 jam pqdq suhu 37o C. Deteksi senyawa antibakteri dilakukan dengan metode KLT-Biautografi kontak. Hasil Uji KLT-Bioautografi kontak terhadap ekstrak methanol C. racemosa var. macrophysa dengan eluen heksan : etilasetat (4 : 1 ) diperoleh 1 noda aktif dengan nilai Rf o,46 yang tergolong senyawa terpenoid dan 1 noda aktif dengan nilai Rf o,53 tergolong senyawa steroid, sedangkan dengan eluen heksan: etilasetat (3;1) diperoleh 2 noda aktif dengan nilai Rf 0.21 dan Rf 0.53 tergolong senyawa steroid. Dari hasil Uji terhadap ekstrak methanol C. sertularioides dengan eluen heksan : etilasetat ( 4:1) diperoleh 1 noda aktif dengan nilai Rf 0,67 yang tergolong senyawa terpenoid, dan hasil ekstrak heksaan dengan elluen heksan: etilasetat (3:1) dieroleh 1 noda aaktif dengan nilai Rf 0.63 yang tergolong senyawa steroid
The spin-temperature dependence of the 21-cm-LAE cross-correlation
No full textCross-correlating 21 cm with known cosmic signals will be invaluable proof of the cosmic origin of the first 21-cm detections. As some of the widest fields available, comprising thousands of sources with reasonably known redshifts, narrow-band Lyman-α emitter (LAE) surveys are an obvious choice for such cross-correlation. Here, we revisit the 21-cm-LAE cross-correlation, relaxing the common assumption of reionization occurring in a pre-heated intergalactic medium (IGM). Using specifications from the Square Kilometre Array and the Subaru Hyper Supreme-Cam, we present new forecasts of the 21-cm-LAE cross-correlation function at z ∼7. We sample a broad parameter space of the mean IGM neutral fraction and spin temperature, (\barx-H small I,\barT-S). The sign of the cross-correlation roughly follows the sign of the 21-cm signal: Ionized regions that surround LAEs correspond to relative hot spots in the 21-cm signal when the neutral IGM is colder than the CMB, and relative cold spots when the neutral IGM is hotter than the CMB. The amplitude of the cross-correlation function generally increases with increasing\barx-H small I, following the increasing bias of the cosmic H ii regions. As is the case for 21 cm, the strongest cross signal occurs when the IGM is colder than the CMB, providing a large contrast between the neutral regions and the ionized regions, which host LAEs. We also vary the topology of reionization and the epoch of X-ray heating. The cross-correlation during the first half of reionization is sensitive to these topologies, and could thus be used to constrain them
LAE deletion mutant behaves as a hypomorphic allele.
No full text(A) Targeted deletion of the LAE with CRIPSR/Cas9 genome editing. The sequences flanking LAE from the wild-type (Wt) and six deleted chromosomes (M1-6) are shown. LAE sequences are depicted in orange while exogenous sequences in mutant chromosomes are indicated by distinctly-colored lower case letters (unmodified nucleotides are upper case ones). (B) Overall bab1-2 expression from wild-type and homozygous babΔLAE L3 leg discs, as determined from reverse transcription quantitative PCR analyses. mRNA levels are normalized from expression of three housekeeping genes: Rpl32, Mlc-c and Gpdh1. Results show the mean and the standard error of the mean of 4 independent experiments (Wilcoxon test p value (TIF)</p
Novel antimicrobial zein film for controlled release of lauroyl arginate (LAE)
No full textNovel antimicrobial biopolymer films based on the incorporation of ethyl-Nα-dodecanoyl-l-arginate hydrochloride (LAE) in zein matrices were manufactured and characterized as materials for LAE controlled released applications such as active food packaging. Characterization of the films’ functional properties revealed that incorporation of LAE (5 and 10%) in the biopolymer matrix did not cause substantial changes in morphological, optical, thermal, mechanical and barrier properties.
As the mechanism of action of these films is mainly based on release of the antimicrobial, this process was characterized when the active biofilms were exposed to three food simulants (water, 3% acetic acid, and 10% alcohol) at three temperatures (4, 23, and 37 °C). The data obtained revealed that, with the exception of exposure to water at 4 °C which achieved a release of more than 80% of the LAE incorporated, the agent was almost completely extracted in all conditions. Release of LAE was faster at higher temperatures, and the diffusion coefficient values varied according to the Arrhenius law, and increased with temperature. Antibacterial activity of films was assayed against Listeria monocytogenes and Escherichia coli. Zein films with 5% LAE produced 2.02 and 3.07 log reduction against L. monocytogenes and E. coli, respectively, after 5 days of storage at 4 °C. Greater antibacterial activity was observed with films containing 10% LAE (5 log reduction) at 37 °C. This work highlighted that LAE incorporation in a packaging film constructed with renewable polymer materials offers an interesting and efficient hurdle for control of bacterial contamination in foods.The authors acknowledge the financial support of the Spanish Ministry of Economy and Competitiveness, projects AGL2012-39920-C03-01. M.K. thanks the Ministry of Sciences, Research and Technology of Iran for her grant. I.D. thanks the CSIC for her postdoctoral contract (JAE-DOC).Peer reviewe
Monitoring Health Inequalities in France: A Short Tool for Routine Health SUrvey to Account for LifeLong Adverse Experiences
No full textConventional health surveys focus on current health and social context but rarely address past experiences of hardship or exclusion. However, recent research shows how such experiences contribute to health status and social inequalities. In order to analyse in routine statistics the impact of lifelong adverse experiences (LAE) on various health indicators, a new set of questions on financial difficulties, housing difficulties due to financial hardship and isolation was introduced in the 2004 French National health, health care and insurance survey (ESPS 2004). Logistic regressions were used to analyze associations between LAE, current socioeconomic status (SES) (education, occupation, income) and health (self-perceived health, activity limitation, chronic morbidity), on a sample of 4308 men and women aged 35 years and older. In our population, LAE were reported by 1 person out of 5. Although more frequent in low SES groups, they concerned above 10% of the highest incomes. For both sexes, LAE are significantly linked to poor self-perceived health, diseases and activity limitations, even controlling for SES (OR>2) and even in the highest income group. This pattern remains significant for LAE experienced only during childhood. The questions successfully identified in a conventional survey people exposed to health problems in relation to past experiences. LAE contribute to the social health gradient and explain variability within social groups. These questions will be useful to monitor health inequalities, for instance by further analyzing LAE related health determinants such as risk factors, exposition and care use.Health inequalities; Lifelong adverse experiences; Health surveys
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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