Ketahanan Hidup Beberapa Jenis Tumbuhan di Kawasan Void Bekas Tambang Batubara

The selection of plant species for phytoremediation activities is very important in the conservation of soil, water, plant, and animal life to create a conducive environment within a community or ecosystem. Plant survival is one indication for the selection of phytoremediation plants. This study aims to determine the survival of some plants in void areas of coal mining. Types of plants used are surface water plants species and the edge of void plant species. The plants of surface water area consisting of Kiambang (Salvinia sp.), Enceng gondok (Eichornia crassipes), Genjer (Limnocharis flava), and Kangkung (Ipomoea aquatica). The plants which planted on edge of void were purun tikus (Eleocharis dulcis) and Bamban (Donax canniformis). Time of observation time was 6 months. Data were analyzed using a tabular matrix that contained the percentage of plant life/period time. The growth of the plant is specifically defined according to the color visibility and the development of plant form. The results of the study found that the highest surface survival species were Kiambang (Salvinia sp.) and Kangkung (Ipomoea aquatica). Both of them still survive for 6 months of observation. The growth percentage of these two plants at the end of the observations are 36% and 20% respectively. Enceng gondok (Eichhornia crassipes) has a survival for 4 months. Whole water plant growth was depressed by indications of death, tendencies to yellowish-brownish or blackish, and smaller body parts. Purun tikus (Eleocharis dulcis) and Bamban (Donax canniformis) grown on the edge of voids have a high survival. Both of them showed ≥95% survival at the end of observation time

Perubahan Komposisi Jenis Vegetasi dan Burung Setelah Penanaman Kelapa Sawit di Lahan Kering Pelaihari Kalimantan Selatan

Elais guenensis planting programe have changed land cover and compotition of vegetation and animal. Vegetation changing by E.guenensis planting becomes multiple effect to other sector. The aims of this research are: to describe changing of land cover and to know changing of vegetation and aves composition after E.guenensis planting. Teresterial survey had arranged to collected data. Analyze of data used time series data and matrice tabulation, descriptive and comparison. Land coverage changing caused by E.guenensis planting. Number of tree species vegetation had been changed from: 33 species to 16 species. Number of aves species had been changed from 21 species to 15 species. Decreasing number and composition of vegetation had influenced decreasing number and composition of aves. Loosing on variation habitat vegetation types which produce food caused population of aves are limited

Investigation of an axial-excursion transducer for squeeze-film bearings

Resonant frequencies and characteristic bearing cone motion of axial-excursion transducer for squeeze-film gas bearing - drive voltage, preload, bearing mass, and mounting ring effect

Penapisan Senyawa Fitokimia Dan Pengujian Antioksidan Ekstrak Daun Pohon Merapat

Hutan kerangas merupakan kumpulan vegetasi pohon di hutan hujan tropis, dicirikan antara lain oleh kandungan hara dan keanekaragaman hayati yang rendah, sehingga penggunaan pohonnya menjadi terbatas. Hutan kerangas tersebar luas di Kalimantan (misalnya Kalimantan Selatan). Salah satu jenis pohon yang dapat tumbuh dan berkembang pada kondisi ekstrim adalah merapat (Combretocarpus rotundatus). Daunnya mengandung senyawa kimia tertentu yang mengindikasikan berkemampuan fisiologis menghasilkan bioaktivitas seperti antioksidan. Sebagai konsekuesinya, hal ini diharapkan dapat meningkatkan nilai tambah dari pemanfaatan pohon kerangas. Terkait hal tersebut, pencermatan terhadap kandungan senyawa fitokimia dan pengujian kemampuan antioksidan dilakukan terhadap sampel kering daun merapat yang berasal dari hutan kerangas di Kalimantan Selatan. Awalnya, daun kering diekstrak dengan larutan metanol menghasilkan ekstrak methanol (sampel 1), fraksinasi lanjutan dilakukan dengan kromatografi kolom menggunakan eluent kloroform. Fraksi kloroform yang didapatkan (sampel 2) selanjutnya difraksinasi kembali menggunakan campuran larutan etil asetat-kloroform (dengan proporsi sama), yang menghasilkan sampel 3. Pencermatan fitokimia mengungkapkan bahwa ekstrak metanol mengandung senyawa fitokimia tertentu seperti flavonoid, turunan phenol, hidrokuinon, tanin dan triterpenoid, yang berperan sebagai antioksidan. Ekstrak metanol (sampel 1) menunjukkan aktivitas antioksidan tertinggi dengan memberikan reaksi reduksi terhadap pelepasan radikal bebas oleh Difenil Pikril Hidrazil Hidrat (DPPH) (2,2-diphenyl-1-picrylhydrazyl), walaupun penggunaan dari fraksi kloroform (sampel 2) dan fraksi lanjutan etil asetat-kloroform (sampel 3) sangat rendah. Penghambatan radikal bebas dari DPPH pada tingkat 50% (IC 50) oleh ekstrak metanol terjadi pada konsentrasi 21,823 ppm. Sementara itu, vitamin C dan BHT sebagai kontrol aktivitas antioksidan terbentuk lebih efisien pada konsentrasi di bawah 21,823 ppm (berturut-turut pada konsentrasi 6,738 ppm dan 6,279 ppm). Bagaimanapun, nilai IC 50 tersebut memberikan penjelasan kuat bahwa potensi bioaktivitas ekstrak metanol daun merapat dapat digunakan sebagai antioksidan

Preparation and properties of zinc doped cadmium selenide compounds by e-beam evaporation

Cd1 – xZnxSe films with different zinc content were deposited by electron beam evaporation technique onto glass substrates for the application of solid-state photovoltaic devices. The structural, surface morphological and optical properties of Cd1 – xZnxSe films have been studied in the present work. The host material, Cd1 – xZnxSe, have been prepared by the physical vapor deposition method of electron beam evaporation technique (PVD: EBE) under a pressure of 1 10 – 5 mbar. The X-ray diffractogram indicates that these alloy films are polycrystalline in nature, hexagonal structure with strong preferential orientation of the crystallites along (002) direction. Linear variation of lattice constant with composition (x) is observed. The optical properties shows that the band gap (Eg) values varies from 2.08 to 2.64 eV as zinc content varies from 0.2 to 0.8. The surface morphological studies show the very small, fine and hardly distinguishable grains smeared all over the surface. It is observed that the grain size is decreasing with increasing zinc content. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2299

The glass transition and crystallization kinetic studies on BaNaB9O15 glasses

Transparent glasses of BaNaB9O15 (BNBO) were fabricated via the conventional melt-quenching technique. The amorphous and the glassy nature of the as-quenched samples were respectively, confirmed by X-ray powder diffraction (XRD) and differential scanning calorimetry (DSC). The glass transition and crystallization parameters were evaluated under non-isothermal conditions using DSC. The correlation between the heating rate dependent glass transition and the crystallization temperatures was discussed and deduced the Kauzmann temperature for BNBO glass-plates and powdered samples. The values of the Kauzmann temperature for the plates and powdered samples were 776 K and 768 K, respectively. Approximation-free method was used to evaluate the crystallization kinetic parameters for the BNBO glass samples. The effect of the sample thickness on the crystallization kinetics of BNBO glasses was also investigated.Comment: 23 pages, 12 figure

Non-Classical Response from Quench-Cooled Solid Helium Confined in Porous Gold

We have investigated the non-classical response of solid 4He confined in porous gold set to torsional oscillation. When solid helium is grown rapidly, nearly 7% of the solid helium appears to be decoupled from the oscillation below about 200 mK. Dissipation appears at temperatures where the decoupling shows maximum variation. In contrast, the decoupling is substantially reduced in slowly grown solid helium. The dynamic response of solid helium was also studied by imposing a sudden increase in the amplitude of oscillation. Extended relaxation in the resonant period shift, suggesting the emergence of the pinning of low energy excitations, was observed below the onset temperature of the non-classical response. The motion of a dislocation or a glassy solid is restricted in the entangled narrow pores and is not likely responsible for the period shift and long relaxation

Analysis of Sertoli Cell-Secreted Proteins by Two-Dimensional Gel Electrophoresis

The [35S]methionine-labeled proteins secreted from cultured Sertoli cells were analyzed by two-dimensional gel electrophoresis and fluorography. Major polypeptides which were resolved by this procedure were designated by number and further analyzed. Many of these major polypeptides appeared as a series of spots which corresponded to charge isomers. Two of these polypeptides (5 and 6) were shown to be acidic, glycosylated and to comprise the subunits of a dimeric protein of molecular weight 70,000. Some of the polypeptides (4a and 5a) were shown to be secreted from testicular peritubular cells which contaminated the Sertoli cell cultures. However, many of the polypeptides (1,2,3,4,5,5b and 6) were specifically secreted from the Sertoli cells. The fluorogram of the secreted polypeptides obtained from cultured Sertoli cells from 20- or 60-day-old rats were similar to each other but differed from the pattern of polypeptides which were secreted from cultures of Sertoli cells from 10-day-old rats. Polypeptide 3 was identified by immunoprecipitation as testicular transferrin and the synthesis of polypeptide 3 was stimulated when the Sertoli cells were cultured in the presence of follicle-stimulating hormone (FSH), insulin, testosterone and retinol

Non-equilibrium Phase Transitions with Long-Range Interactions

This review article gives an overview of recent progress in the field of non-equilibrium phase transitions into absorbing states with long-range interactions. It focuses on two possible types of long-range interactions. The first one is to replace nearest-neighbor couplings by unrestricted Levy flights with a power-law distribution P(r) ~ r^(-d-sigma) controlled by an exponent sigma. Similarly, the temporal evolution can be modified by introducing waiting times Dt between subsequent moves which are distributed algebraically as P(Dt)~ (Dt)^(-1-kappa). It turns out that such systems with Levy-distributed long-range interactions still exhibit a continuous phase transition with critical exponents varying continuously with sigma and/or kappa in certain ranges of the parameter space. In a field-theoretical framework such algebraically distributed long-range interactions can be accounted for by replacing the differential operators nabla^2 and d/dt with fractional derivatives nabla^sigma and (d/dt)^kappa. As another possibility, one may introduce algebraically decaying long-range interactions which cannot exceed the actual distance to the nearest particle. Such interactions are motivated by studies of non-equilibrium growth processes and may be interpreted as Levy flights cut off at the actual distance to the nearest particle. In the continuum limit such truncated Levy flights can be described to leading order by terms involving fractional powers of the density field while the differential operators remain short-ranged.Comment: LaTeX, 39 pages, 13 figures, minor revision

Analisis Potensi Simpanan Karbon Hutan Mangrove Di Area PT. Indocement Tunggal Prakarsa, Tbk P 12 Tarjun

This study aims to analyze the structure of the mangrove forest stands in a conservation area PT. Indocement P12 Tarjun, South Kalimantan. To determine the potential amount of carbon stored in vegetation and soils di area mangrove forests. Merumuskah form of management in accordance with mangrove forests owned by PT Indocement Tunggal Tbk P 12 Tarjun. The results of this study show the type of vegetation that are within the plot observation is Aegicera corniculatum, Acivennia alba, Avicennia lanata, Avicennia Marina, Bruguera gymnorrhiza, Bruguiera parviflora, Ceriops decandra, Lumnitzera, Rhizophora apiculate, Rhizophora mucronata, Scyphiphora hydrophyllacea, Sonneratia alba, Xylocarpus granatum, Acanthus ebracteatus, Hibiscus tiliaceus, Nypa fruticans, Terminalia catappa and type of vegetation present in the area of research, but is not included in the observation plot is Acrostichum aureum Linn, Pandanus odoratissima. Importance Value Index (IVI) lenata kind Avicennia highest growth rate of the tree that is 80,2%, Rhizophora apiculata at the level of the pole that is 57%, and Nypa fruticans at the seedling stage is 20,8%. To Nypa fruticans, though IVIs largest/highest species of plants in the seedling stage but this type is only found on two research plots only. Total carbon content was found at the study site was at 714,77 per hectare. The study was conducted on biomass carbon on the surface, lower plants, nekromassa (dead trees), and mangrove sediments (ground). Carbon sequestration at a site can be seen from the height and diameter of trees while a vegetation type had no significant effect on the absorption of carbon. Environmental management in the form of replanting are research needs to be done to avoid more severe harm than good because of logging by humans atupun affected by coastal erosion. Type Lumnitzera, Scyphiphora hydrophyllacea, Ceriops decandra should get more attention because it has a very low INP hat is necessary to manage lebis so it can be adjusted with the handling principles of environmental factors such as tidal conditions, sediment, pH, salinit