Journal articles: 'Kepler family' – Grafiati (2024)

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We consider a family of explicit Runge–Kutta pairs of orders six and five without any additional property (reduced truncation errors, Hamiltonian preservation, symplecticness, etc.). This family offers five parameters that someone chooses freely. Then, we train them in order for the presented method to furnish the best results on a couple of Kepler orbits, a certain interval and tolerance. Consequently, we observe an efficient performance on a wide range of orbital problems (i.e., Kepler for a variety of eccentricities, perturbed Kepler with various disturbances, Arenstorf and Pleiades). About 1.8 digits of accuracy is gained on average over conventional pairs, which is truly remarkable for methods coming from the same family and order.

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We have studied the self-adjointness of generalized MIC–Kepler Hamiltonian, obtained from the formally self-adjoint generalized MIC–Kepler Hamiltonian. We have shown that for [Formula: see text], the system admits a one-parameter family of self-adjoint extensions and for [Formula: see text] but [Formula: see text], it also has a one-parameter family of self-adjoint extensions.

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We construct supersymmetric (SUSY) generalized MIC–Kepler system and show that the systems with half integral Dirac quantization condition [Formula: see text] belong to an SUSY family (hierarchy of Hamiltonian) with same spectrum between the respective partner Hamiltonians except for the ground state. Similarly, the systems with integral Dirac quantization condition μ=±1,±2,±3,… belong to another family. We show that, it is necessary to introduce additional potential to MIC–Kepler system in order to unify the two families into one. We also reproduce the results of the (supersymmetric) Hydrogenic problem in our study.

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We study the global bifurcation diagram of the two-parameter family of ODE’s that govern the charged isosceles three-body problem. (The classic isosceles three-body problem and the anisotropic Kepler problem (two bodies) are included in the same family.) There are two major sources of periodic orbits. On the one hand the “Kepler” orbit, a stable orbit exhibiting the generic bifurcations as the multiplier crosses rational values. This orbit turns out to be the continuation of the classical circular Kepler orbit. On the other extreme we have the collision-ejection orbit which exhibits an “infinite-furcation.” Up to a limiting value of the parameter we have finitely many periodic orbits (for each fixed numerator in the rotation number), passed this value there is a sudden birth of an infinite number of them. We find that these two bifurcations are remarkably connected forming the main “skeleton” of the global bifurcation diagram. We conjecture that this type of global connection must be present in related problems such as the classic isosceles three-body problem and the anisotropic Kepler problem.

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The derivation of Runge–Kutta pairs of orders five and four that effectively uses six stages per step is considered. The coefficients provided by such a method are 27 and have to satisfy a system of 25 nonlinear equations. Traditionally, various solutions have been tried. Each of these solutions makes use of some simplified assumptions and offers different families of methods. Here, we make use of the most celebrated family to appear in the literature, where we may use as the last stage the first function evaluation from the next step (FSAL property). The family under consideration has the advantage of being solved explicitly. Actually, we arrive at a subsystem where all the coefficients are found with respect to five free parameters. These free parameters are adjusted (trained) in order to deliver a pair that outperforms other similar pairs of orders 5(4) in Keplerian type orbits, e.g., Kepler, perturbed Kepler, Arenstorf orbit or Pleiades. The training uses differential evolution technique. The finally proposed pair has a remarkable performance and offers on average more than a digit of accuracy in a variety of orbits.

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Data extracted from the Extrasolar Planets Encyclo- paedia (see http://exoplanet.eu ) show the existence of planets that are more massive than iron cores that would have the same size. After meticulous verification of the data, we conclude that the mass of the smallest of these planets is actually not known. However, the three largest planets, Kepler-52b, Kepler-52c and Kepler-57b, which are between 30 and 100 times the mass of the Earth, have indeed density larger than an iron planet of the same size. This observation triggers this study that investigates under which conditions these planets could represent the naked cores of gas giants that would have lost their atmospheres during their migration towards the star. This study shows that for moderate viscosity values (10 25 Pa s or lower), large values of escape rate and associated unloading stress rate during the atmospheric loss process lead to the explosion of extremely massive planets. However, for moderate escape rate, the bulk viscosity and finite-strain incompressibility of the cores of giant planets can be large enough to retain a very high density during geological time scales. This would make those a new kind of planet, which would help in understanding the interior structure of the gas giants. However, this new family of exoplanets adds some degeneracy for characterizing terrestrial exoplanets.

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We use a neural network approach to derive a Runge–Kutta–Nyström pair of orders 8(6) for the integration of orbital problems. We adopt a differential evolution optimization technique to choose the free parameters of the method's family. We train the method to perform optimally in a specific test orbit from the Kepler problem for a specific tolerance. Our measure of efficiency involves the global error and the number of function evaluations. Other orbital problems are solved to test the new pair.

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Kepler famously remarked of his great Florentine friend that he could never keep sufficiently straight a man whose first name so resembled his last: Galileo Galilei. Others have labored under (or benefited from) this duality, and this third essay of my series tells a tale of the most obscure, yet highly significant, character that I have ever encountered from the early history of our science: the Neapolitan scholar (1461–1523) who called himself Alessandro ab Alessandro, or Alexander de Alexander, or Alessandro degli Alessandro—all meaning (roughly) Alexander from the family of Alexander.

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Of the 900+ confirmed exoplanets discovered since 1995 for which we have constraints on their mass (i.e. not including Kepler candidates), 75% have masses larger than Saturn (0.3 M J ), 53% are more massive than Jupiter and 67% are within 1 AU of their host stars. When Kepler candidates are included, Neptune-sized giant planets could form the majority of the planetary population. And yet the term ‘hot Jupiter’ fails to account for the incredible diversity of this class of astrophysical object, which exists on a continuum of giant planets from the cool jovians of our own Solar System to the highly irradiated, tidally locked hot roasters. We review theoretical expectations for the temperatures, molecular composition and cloud properties of hydrogen-dominated Jupiter-class objects under a variety of different conditions. We discuss the classification schemes for these Jupiter-class planets proposed to date, including the implications for our own Solar System giant planets and the pitfalls associated with compositional classification at this early stage of exoplanetary spectroscopy. We discuss the range of planetary types described by previous authors, accounting for (i) thermochemical equilibrium expectations for cloud condensation and favoured chemical stability fields; (ii) the metallicity and formation mechanism for these giant planets; (iii) the importance of optical absorbers for energy partitioning and the generation of a temperature inversion; (iv) the favoured photochemical pathways and expectations for minor species (e.g. saturated hydrocarbons and nitriles); (v) the unexpected presence of molecules owing to vertical mixing of species above their quench levels; and (vi) methods for energy and material redistribution throughout the atmosphere (e.g. away from the highly irradiated daysides of close-in giants). Finally, we discuss the benefits and potential flaws of retrieval techniques for establishing a family of atmospheric solutions that reproduce the available data, and the requirements for future spectroscopic characterization of a set of Jupiter-class objects to test our physical and chemical understanding of these planets.

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ABSTRACT It is common in classical mechanics to encounter systems whose Hamiltonian H is the sum of an often exactly integrable Hamiltonian H0 and a small perturbation ϵH1 with ϵ ≪ 1. Such near-integrability can be exploited to construct particularly accurate operator splitting methods to solve the equations of motion of H. However, in many cases, for example in problems related to planetary motion, it is computationally expensive to obtain the exact solution to H0. In this paper, we present a new family of embedded operator splitting (EOS) methods which do not use the exact solution to H0, but rather approximate it with yet another, EOS method. Our new methods have all the desirable properties of classical methods which solve H0 directly. But in addition they are very easy to implement and in some cases faster. When applied to the problem of planetary motion, our EOS methods have error scalings identical to that of the often used Wisdom–Holman method but do not require a Kepler solver, nor any coordinate transformations, or the allocation of memory. The only two problem specific functions that need to be implemented are the straightforward kick and drift steps typically used in the standard second-order leap-frog method.

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Hiperurisemia adalah suatu kondisi dimana kadar asam urat dalam darah meningkat melebihi batas normal. Kondisi hiperurisemia atau gangguan metabolisme pada asam urat yang terjadi secara terus-menerus akan mendasari terjadinya Gout Arthritis. Di Indonesia, prevalensi penyakit sendi berdasarkan diagnosis dokter pada penduduk umur ≥ 15 tahun sebesar 7,3%, persentase penyakit sendi juga menempati posisi kedua terbesar setelah stroke pada prevalensi penyakit tidak menular di Indonesia berdasarkan diagnosis dokter pada penduduk umur ≥ 15 tahun dilihat dari hasil Riskesdas 2018. Selama satu dekade terakhir, beberapa spesies tanaman dari famili annonaceae seperti sirsak (Annona muricata L.), kepel (Stelechocarpus burahol (Bl.) Hook. F. & Th.), srikaya (Annona squamosa L.) dan nona (Annona reticulate L.) telah dilakukan penelitian mengenai aktivitas antihiperurisemia baik in vitro, in vivo, maupun uji klinik fase nol. Oleh karena itu, review ini akan membahas aktivitas antihiperurisemia dari beberapa spesies tanaman yang termasuk ke dalam famili annonaceae. Review ini bertujuan untuk memberikan informasi terkait aktivitas antihiperurisemia dari famili annonaceae berdasarkan studi literatur dari artikel-artikel penelitian sebelumnya. Pada review artikel ini digunakan literatur online dan offline. Literatur online didapat dari jurnal publikasi nasional maupun internasional yang diperoleh dari penyedia jurnal di internet. Literatur offline yang digunakan yaitu buku dan e-book. Hasil yang didapatkan yaitu beberapa spesies tanaman dari famili annonaceae seperti sirsak (Annona muricata L.), kepel (Stelechocarpus burahol (Bl.) Hook. F. & Th.), srikaya (Annona squamosa L.) dan nona (Annona reticulata L.) memiliki aktivitas antihiperurisemia melalui beberapa pengujian baik in vitro dengan uji daya hambat xantin oksidase, in vivo dengan menurunkan kadar asam urat pada hewan uji, serta uji klinik fase nol dengan eksperimental historis (pre-post design) pada responden. Oleh karna itu, diharapkan dapat menjadi alternatif pengobatan untuk hiperurisemia dan dikembangkan sebagai obat antihiperurisemia.Hyperuricemia is a condition wherein the level of uric acid in the blood increases beyond the normal limit. Condition of hyperuricemia or metabolic disorders in uric acid that occurs continuously the occurrence of Gout Arthritis. In Indonesia the prevalence of joint diseases based on the diagnosis of doctors in population age ≥ 15 years 7.3%, the percentage of joint disease also occupy the second largest after stroke in the prevalence of diseases not transmitted in Indonesia based on the diagnosis of doctors in the age population ≥ 15 years seen from the results Riskesdas 2018. Over the last decade, several species of plants from the annonaceae family such as soursop (Annona muricata L.), kepel (Stelechocarpus burahol (Bl.) Hook. F. & Th.), sweetsop (Annona squamosa L.) and custard apple (Annona reticulate L.) have been carried out research on the activity of antihyperuricemia in either in vitro, in vivo, or zero-phase clinical trials. Therefore, this review will discuss the activity of antihyperuricemia from several species of plants that belong to the annonaceae family. This Review aims to provide information regarding the activity of antihyperuricemia from the annonaceae family based on literary studies of previous research articles. In this article review used the online and offline literature. Online literature is obtained from national and international publications obtained journals from journal providers on the internet. The offline literature used is books and e-books. The results obtained are several species of plants from the annonaceae family such as soursop (Annona muricata L.), kepel (Stelechocarpus burahol (Bl.) Hook. F. & Th), sweetsop (Annona squamosa L.) and custard apple (Annona reticulata L.) have antihyperuricemia activities through several in vitro testing with xanthine oxidase inhibition tests, in vivo by lowering uric acid levels in animal tests, as well as a zero-phase clinical test with historical experimental (pre-post design) respondents. Therefore, it is hoped that it can be an alternative treatment for hyperuricemia and developed as an antihyperuricemia drug. Keywords: antihyperuricemia, uric acid, in vitro, in vivo, zero phase clinical trials

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Makrozoobentos merupakan organisme yang peka terhadap perubahan lingkungan sehingga sangat baik digunakan sebagai indikator biologis suatu perairan. Penelitian ini bertujuan untuk mengetahui jenis makrozoobentos, tingkat keanekaragaman, keseragaman, dominansi makrozoobentos dan kualitas perairan Senggarang Besar berdasarkan keberadaan makrozoobentos (menggunakan Family Biotic Index). Penelitian menggunakan metode survei. Penentuan stasiun menggunakan metode purposive sampling. Pengambilan sampel makrozoobentos menggunakan line transect dengan transek kuadrat dan core sampler. Makrozoobentos yang ditemukan di Perairan Senggarang Besar yaitu: Anadara granosa, Canarium urceus, Capitella teleta, Cerithium coralium, Nerita ritena, Luidia columbia, Tapes literatus, Nassarius olivaceus, Pirenella cingulata, Planaxis sulcatus, Polymesoda erosa, Pythia scarabaeus, Semiricinula tissoti, dan Terebralia sulcata. Keanekaragaman tertinggi terdapat pada stasiun 2 (H'= 1,91) dan makrozoobentos yang mendominasi dari famili Certhiidae. Keseragaman tertinggi terdapat pada stasiun 3 (E= 0,94) dan makrozoobentos yang mendominasi dari famili Potamididae. Dominansi tertinggi terdapat pada stasiun 1 (C= 0,52) dan makrozoobentos yang mendominasi dari famili Potamididae dan Cerithiidae. Dari keseluruhan parameter fisika-kimia, parameter nitrat dan fosfat tidak memenuhi baku mutu berdasarkan KepMen LH No.51 Tahun 2004 untuk biota laut. Kualitas perairan Senggarang Besar berdasarkan makrozoobentos sebagai bioindikator didapatkan bahwa, stasiun 1 (FBI= 6,94) dengan kategori buruk, stasiun 2 (FBI= 5,6) dengan kategori cukup, stasiun 3 (FBI= 7) dengan kategori buruk.

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<pre><em>Orchid is the general name for all types of plants in the family Orchidaceae (family of orchids). This family is one of the largest groups among other flowering plants. It is estimated that worldwide there are around 15,000-20,000 species of orchids with 900 genera (clans) that grow endemic to forests scattered in various countries. Of all orchid species in the world, 5,000 of them are in Indonesia. Broadly speaking, the classification of orchids is divided into 5 subfamilies, 16 tribes (tribes), and 28 subtribes. Phalaenopsis is a genus of orchids which is popular for its diversity and beauty of flowers. The government through presidential decree (Kepres) No. 4 of 1993, on January 9, 1993, designated the moon orchid as a charm flower named Latin Phaleonopsis amabilis, this orchid grows attached to a tree trunk or branch and is one type of orchid endemic to Indonesia. The development of orchid cultivation has never been separated from disease and pest problems. With few disease infections and pest attacks, the beauty will change, of course, the selling price will fall. Orchid plants require extra care to grow with beautiful flowers. Orchid disease can be caused by bacteria, fungi or viruses. Diseases and pests that attack orchid plants can cause death if allowed to continue. Besides that, mishandling can also cause the death of orchids. The purpose of this study was to determine the pests and diseases of the Phalaenopsis amabilis plant.</em></pre><pre><em>This research was conducted on December 2, 2020 and January 13-14, 2021 in Carikan Sukoharjo with 10 samples of Phalaenopsis amabilis plants. The tools needed in this research include writing tools, tables, loops and documentation tools (cellphone cameras). The variables to be observed were diseases and pests that attacked. The methods used were direct observation and interviews, the data obtained were analyzed by qualitative descriptive.</em><em></em></pre><p><em>Research conducted on 10 samples of Phalaenopsis amablis, found 6 pests and 2 diseases. Pests on the Phalaenopsis amabilis Moon Orchid plant are found that very often attack such as ants, snails, grasshoppers, mealybugs, mites and caterpillars. Whereas in the disease of the Moon Orchid plant (Phalaenopsis amabilis) in the search for Sukoharjo, the fungus Fussarium oxyporum and Rhizoctonia solani attack the leaves, stems, roots of Phalaenopsis amabilis. This disease enters the plant tissue through stomata or wounds in plants. In general, the characteristics of a fungal attack include small spots on the leaves, blisters like being scalded, watery, either cloudy or clear.</em></p>

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Katili AS, Ibrahim M, Zakaria Z. 2017. Degradation level of mangrove forest and its reduction strategy in Tabongo Village, Boalemo District, Gorontalo Province, Indonesia. Asian J For 1: 18-22. This research aimed to assess the degradation level of mangrove forest and to develop strategy to reduce the degradation level. The overall research duration was 1 year, focusing on identification of mangrove forests degradation level, exploration of mangrove vegetation structure and preparation for mangrove degradation reduction strategy. The research was located in Tabongo Village, Dulupi Sub-district, Boalemo District, Gorontalo Province. The method used in the research was explorative survey, while the data analysis was done with quantitative descriptive analysis. The collecting method used was point quarter centered meter (PQCM) method. The degradation level of mangrove forest was analyzed by standard criteria of mangrove destruction according to Ministerial Decree of State Minister for The Environment (Kepmen. LH) No. 201 in 2004. Results showed that there are 4 species of mangrove plants in Tabongo Village, Dulupi Sub-district namely Rhizophora apiculata Blume, Rhizophora mucronata Lamk., Ceriops tagal (Perr) C.B.Rob, and Bruguiera which included in the Rhizophoraceae family. Rhizophora apiculata had the highest IVI value at the stage of tree and sapling, while Rhizophora mucronata Lamk had the highest IVI value at the stage of seedling. Tabongo mangrove area was a Scrub or dwarf forest type generally. This type was classified as a typical mangrove found in low edges. The mangrove condition in the coastal area of Tabongo Village, Boalemo, was categorized as broken (TNS1 = 210). While based on Assessment of criticality level of mangrove land based on the way teristris, formula was categorized as not broken (TNS2= 330). The reduction strategy that could be implemented to recover the quality of mangrove areas include (i) the assessment of the importance of the mangrove areas with regard to their ecological and economic value, (ii) quality improvement of mangrove habitat, (iii) educational approach by making the mangrove areas as learning media and source, and (iv) empowerment of people living around the mangrove areas.

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Background: Uric acid is a problem in the elderly, with symptoms of joint and heel pain every time you wake up in the morning, stiff on the fingers and toes and swelling and redness. The incidence of gout in the elderly accounted for 47 cases in Hatra R. One of the actions that can reduce uric acid levels is herbal medicine. Sidaguri types of herbs, kepel and bay leaves containing flavonoids, ethanol and hexane can inhibit the activity of xanthine oxidase enzymes that have the potential to reduce uric acid levels in the blood. The purpose of this study was to determine the service of herbal medicine in Mrs. S with high blood uric acid levels. Methods: This research is a descriptive type with a case study approach to 1 client with characteristics of pain in the right waist to the knee. Data collection techniques using the assessment of herbal services. Data validity test is done by triangulation technique based on source triangulation, namely getting information from the client, family, supporting examinations brought by the client, then technique trangulation is by interview and observation and time triangulation namely by checking the data carried out in an iterative time to get the results of the decline uric acid levels in the blood. Results: The results showed that the client's condition is the level of uric acid in the blood to be normal and the pain in the right knee to heal and be able to walk normally so the problem is resolved. Interventions conducted on the client are assessment, determining the problem with the client, determining planning, providing herbal medicine and evaluating services. The results of the evaluation of the action showed that the problem was resolved by decreasing the level of uric acid in the blood. Conclusion: The service of herbal medicine in Ny.S with increased levels of uric acid in the blood can reduce uric acid levels in the blood.

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Background:Familial Mediterranean Fever (FMF), which is more common in groups in the Mediterranean basin, is a monogenic autoinflammatory disease characterized by recurrent attacks of febrile peritonitis, pleuritis and arthritis.Objectives:In this study, we aimed to investigate the clinical, demographic and genotypic features that may be associated with subclinical inflammation in FMF and to determine the related parameters with subclinical inflammation.Methods:FMF patients according to the Tel-Hashomer criteria were included into the study. The demographic characteristics of the patients, duration of the disease, concomitant diseases, MEFV genotype mutation, colchicine use and resistance were collected. Acute-phase reactants such as white blood cell count, erythrocyte sedimentation rate, and C-reactive protein levels during the attacks and attack-free periods were noted. Subclinical inflammation was defined as the continuation of the acute phase response (CRP) between episodes. We divided study population into two groups as; patients with or without subclinical inflammation (Group 1 and Group 2, respectively) and these group were compared with the parameters described above. Patients with infectious disease (viral or bacterial) in the past two months were excluded from the studyResults:Eigthy patients (72.5% female) with mean age 37.1 SD 11.2 years were recruited into the study. Twenty-three (28.7%) patients were determined with subclinical inflammation. Group 1 had significantly higher rate of concomitant rheumatic disease(i.e spondyloarthropathy), erythrocyte sedimentation rate and MEFV hom*ozygous mutation compared with Group 2 (p<0.05, for each). Disease duration, months PRASS score, FMF quality of life, age at onset of symptoms, family history of FMF, response to colchicine, attack time, attack in the last 6, delay in diagnosis parameters were not significantly different between groups (p> 0.05).Conclusion:FMF patients whose elevated erythrocyte sedimentation rate and MEFV hom*ozygous mutation should be closely monitored for subclinical inflammation even during attack-free periods. Concomitant disease should be detected in FMF patients with subclinical inflammation.References:[1]Shinawi M, Brik R, Kepten I, Berant M, Gersoni B. Familial Mediterranean fever: high gene frequency and heterogenous disease among Israeli-Moslem Arab population. J Rheumatol 2000;27:1492–5[2]Bayram MT, Çankaya T, Bora E, Kavukçu S, Ülgenalp A, Soylu A, Türkmen M. Risk factors for subclinical inflammation in children with Familial Mediterranean fever. Rheumatol Int. 2015 Aug;35(8):1393-8.Table 1:Demographic and clinical features of the patients with familial Mediterranean feverWithout Subclinical inflamationn= (57)With Subclinical inflamationn= (23)P valueAge (years; mean SD)37,78 SD 13,2236,82 SD 10,490.987Female, gender, n (%)45(%78)13(%56)0.055Disease duration(month; mean SD)255,3 SD 195,1180,2 SD 121,10.191PRASS score(mean SD)6,08 SD 2,155,36 SD 1,590.147BMİ, kg/m226,12 SD 4,832,13 SD 28,480.629Current smoking status (%)17(%29)3(%13)0.067Age at onset of symptoms (month; mean SD)15,69 SD 9,4117,28 SD 10,340.54Family history of FMF(%)37(%64)18(%78)0.295Response to colchicine(%)6(%10)4(%17)0.462Attack time(day; mean SD)1,9 SD 1,12,26 SD 1,40,523Attack in the last 6 months (mean SD)2,79 SD 3,14,56 SD 5,50,184FMF quality of life(mean SD)31,5 SD 13,625.7 SD 16,40,130Delay in diagnosis(month; mean SD)12,29 SD 10,914,3 SD 14,90,840Disclosure of Interests:None declared

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The aim of this note is to explain the integrability of an integrable Boltzmann billiard model, previously established by Gallavotti and Jauslin [G. Gallavotti and I. Jauslin, A theorem on Ellipses, an integrable system and a theorem of Boltzmann, preprint (2020); arXiv:2008.01955], alternatively via the viewpoint of projective dynamics. We show that the energy of a corresponding spherical problem leads to an additional first integral of the system equivalent to Gallavotti–Jauslin’s first integral. The approach also leads to a family of integrable billiard models in the plane and on the sphere defined through the planar and spherical Kepler–Coulomb problems.

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Abstract A method for machine learning and serving of discrete field theories in physics is developed. The learning algorithm trains a discrete field theory from a set of observational data on a spacetime lattice, and the serving algorithm uses the learned discrete field theory to predict new observations of the field for new boundary and initial conditions. The approach of learning discrete field theories overcomes the difficulties associated with learning continuous theories by artificial intelligence. The serving algorithm of discrete field theories belongs to the family of structure-preserving geometric algorithms, which have been proven to be superior to the conventional algorithms based on discretization of differential equations. The effectiveness of the method and algorithms developed is demonstrated using the examples of nonlinear oscillations and the Kepler problem. In particular, the learning algorithm learns a discrete field theory from a set of data of planetary orbits similar to what Kepler inherited from Tycho Brahe in 1601, and the serving algorithm correctly predicts other planetary orbits, including parabolic and hyperbolic escaping orbits, of the solar system without learning or knowing Newton’s laws of motion and universal gravitation. The proposed algorithms are expected to be applicable when the effects of special relativity and general relativity are important.

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When the camera became a domestic consumer good, photography was adapted to the needs of private production and reception (Slater, 1991: 50). The family archive contains images of selfportrayal, whose form is oriented towards established patterns, like cartes-de-visite, since they are received privately as well as in a quasi-public area (wallet, desk in an office etc.). Family photography gains its performative character by means of its phatic function (Malinowski, 1923/1949: 315-7), inscribed in a historical and socio-cultural frame (Hirsch, M. 1997: 10-2). It actuates in the border between naivety and formality, and these Memory-Pictures (Keppler, 1994: 187) create an impression of reliability and authenticity by their ritualized reception. The storage in a family archive and the perfomativity of its reception oscillate between the paradigm of scripture and the regime of narration (Langford, 2006: 227). The characterization of the media category ‘family photography’ by means of the phatic function of communication, and the identification of suitable tools for the analysis, are the topics of this article.

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Penelitian mengenai ekologi dan struktur komunitas lamun ini dilakukan tanggal 10 – 15 Juni 2013 di perairan pesisir Teluk Ratatotok, Minahasa Tenggara. Metode penelitian dilakukan secara purposive sampling terkait dengan keberadaan lamun. Penelitian yang dilakukan meliputi pengukuran prosentase tutupan lamun, kerapatan, struktur komunitas, dan kondisi lingkungan di lokasi penelitian. Terdapat tujuh jenis lamun yang terdiri dari dua famili. Famili Hydrocharitaceae ditemukan tiga jenis lamun yaitu Enhalus acoroides (Ea), Thalassia hemprichii (Th) dan Halophila ovalis (Ho). Empat jenis lamun dari famili Cymodoceaceae yaitu Cymodocea serrulata (Cs), Cymodocea rotundata (Cr), Halodule pinifolia (Hp), dan Syringodium isoetifolium (Si). Kisaran prosentase penutupan rata-rata antara 22,5% - 89,5%. Kerapatan lamun perstasiun berkisar antara 17 – 473 ind/m2, dengan kerapatan tertinggi lamun jenis Ho sebesar 473 ind/m2 di stasiun 6. Nilai INP tertinggi pada lamun jenis Ea sebesar 128% diikuti berturut-turut oleh Si (41%), Th (36%), Ho (27%), Cs (26%), Cr (24%) dan Hp (17%). Berdasarkan kriteria status kondisi padang lamun (Kepmen LH no 200 tahun 2004), kondisi padang lamun di Teluk Ratatotok antara rusak/miskin sampai dengan baik/sehat. Stasiun 5 kondisi rusak/miskin, stasiun 3 dan 4 kondisi rusak/kurang sehat dan tiga stasiun kondisi baik/sehat yaitu stasiun 1, 2 dan 6. Secara keseluruhan kondisi lingkungaan Teluk Ratatotok masih mendukung pertumbuhan lamun.

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Abstract. Sahami FM, Kepel RC, Olii AH, Pratasik SB, Lasabuda R, Wantasen A, Habibie SA. 2020. Morphometric and genetic variations of species composers of nike fish assemblages in Gorontalo Bay Waters, Indonesia. Biodiversitas 21: 4571-4581. Nike is Gobioidei fish at the post-larval and juvenile stages whose habitat is still in seawater before they migrate to the freshwater, grow up, and spawn to fulfill their life cycle as an amphidromous species. This study aims to identify the species composers of Nike fish in Gorontalo Bay waters based on their morphometric and molecular characters. 2,523 samples were collected from the catches of fishermen during three periods of their appearance in Gorontalo Bay waters from January to March 2019. The samples were grouped based on their similarity of melanophore patterns, and morphometric characters of 10 units were then measured. This study found 20 different groups of melanophore patterns; 15 of them were new melanophore patterns. DNA samples from each group of new melanophore patterns were then isolated for molecular analysis. The morphometric analysis grouped the 20 melanophore patterns into three separate clusters that were confirmed through molecular analysis. The results of Gen Cytochrome Oxidase I (COI) sequences indicate that the new melanophore patterns of Nike fish assemblages consisting of six species; five species in the Gobiidae family (i.e. Sicyopterus parvei, S. cynocephalus, S. longifilis, S. lagocephalus, and Stiphodon semoni) and a species in the Eleotridae family (Belobranchus belobranchus).

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