Pengaruh Jenis Mulsa terhadap Pertumbuhan dan Hasil Tiga Kultivar Kentang (Solanum Tuberosum L.) yang Ditanam di Dataran Medium

The objectives of the experiment were to study growth and yield of three potato (Solanum tuberosum L.) cultivars planted at medium altitude with different types of mulch. The experiment is located at experimental station of Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang at an altitude of about 680 m. The experiment was arranged in a Randomized Completed Block Design with factorial pattern, consisting of two factors and three replications. First factor was potato cultivar (Granola, Kennebec, and Panda), and the second factor was types of mulch, consisted of three levels : without mulch, straw mulch, and silver black polyethylene mulch. The result of the experiment showed that Panda cultivar had highest dry weight (29.5 g/plant) and leaf area (2513.7 cm2), while Granola cultivar had highest number of tuber per plant (15.17 knol/plant ) and highest tuber weight per plant was 650.6 g/plant (30.3 t.ha-1). Straw and silver black polyethylene mulches increased leaf area, dry weight, number of tuber per plant and tuber weight per plant. The effect of interaction betwen potato cultivar and source of mulch was significant on plant height. Panda cultivar and silver black polyethylene mulch resulted the highest height of plant (68.2 cm)

Near-UV to near-IR disk-averaged Earth's reflectance spectra

We report 320 to 1020nm disk-averaged Earth reflectance spectra obtained from Moon's Earthshine observations with the EMMI spectrograph on the NTT at ESO La Silla (Chile). The spectral signatures of Earth atmosphere and ground vegetation are observed. A vegetation red-edge of up to 9% is observed on Europe and Africa and ~2% upon Pacific Ocean. The spectra also show that Earth is a blue planet when Rayleigh scattering dominates, or totally white when the cloud cover is large.Comment: Proceeding of an oral prensentation at the UAI No200 Colloquiu

Pengaruh Kegiatan Geothermal Terhadap Keanekaragaman Ikan Di Aliran Sungai Cikaro, Kabupaten Bandung

Penelitian ini bertujuan untuk mengetahui jenis dan keanekaragaaman ikan di Sungai Cikaro Kabupaten Bandung, serta pengaruh Eksplorasi Panas Bumi (Geothermal) terhadap keanekaragaman ikan di hulu Sungai Cikaro Kabupaten Bandung yang dilakukan dari bulan April sampai dengan Juni 2015. Metode yang digunakan adalah metode survey dengan 4 stasiun, dan dilaksanakan pada bulan April sampai Juni 2015. Jenis ikan yang teridentifikasi selama penelitian adalah Puntius binotatus (14,8%), Hampala macrolepidota (1,5%), Osteochilus vittatus(0,5%), Rasbora aprotaenia(3,9%), Gambusia affinis (9,9%), Anabas testudineus (8,4%), Mystus nemurus (35%), Channa striata (3%), Oreochromis niloticus(7,4%), Trichogaster trichopterus (11,8%), Pterygoplichthys pardalis (1,5%) dan Monopterus albus (2,5%). Indeks Keanekaragaman Ikan yang didapati pada stasiun 1 1,08. Stasiun 2 adalah 0. Stasiun 3 adalah 1,79. Stasiun 4 adalah1,47. Indeks Keseragaman Ikan di stasiun 1 adalah 1,08. Stasiun 2 adalah 0. stasiun 3 adalah 0,86. Dan stasiun 4 adalah 0,71. Pengaruh limbah geothermal tidak berpengaruh terhadap stasiun 3 dan 4 karena nilai kualitas perairan tidak berbeda dengan stasiun 1 yang tidak terkena terpengaruh oleh limbah kegiatan eksplorasi geothermal

Pengaruh Mutagen Etil Metan Sulfonat Terhadap Regenerasi Tunas Pada Dua Genotip Manggis Asal Purwakarta Dan Pandeglang

Tanaman manggis termasuk tanaman apomik. Pemuliaan mutasi dapat meningkatkan keragaman genetik pada tanaman manggis. Penelitian bertujuan mengetahui pengaruh pembentukan tunas dua genotip manggis akibat perlakuan beberapa konsentrasi etil metan sulfonat (EMS) yang berbeda. Percobaan dilakukan di Laboratorium Kultur Jaringan Pemuliaan Tanaman, Fakultas Pertanian, Universitas Padjadjaran sejak bulan September 2012 – Februari 2013. Eksplan manggis yang digunakan adalah biji manggis asal Purwakarta (A) dan Pandeglang (B). Percobaan ditata dalam rancangan acak lengkap (RAL). Konsentrasi EMS terdiri atas 0; 0,05; 0,1; 0,15; dan 0,2% digunakan sebagai perlakuan. Hasil penelitian menunjukkan bahwa regenerasi tunas pada eksplan dua genotip asal Purwakarta dan Pandeglang memiliki respons yang berbeda akibat perlakuan mutagen EMS. Pada perlakuan a3 (genotip asal Purwakarta pada EMS 0,1%) menghasilkan waktu muncul tunas lebih cepat dan jumlah tunas per eksplan paling tinggi, sedangkan perlakuan b4(genotip asal Pandeglang pada perlakuan EMS 0,15%) memiliki nilai paling tinggi pada karakter tinggi tunas. Perlakuan a5(genotip asal Purwakarta pada EMS 0,2 %) merupakan perlakuan paling baik pada karakter jumlah pasang dau

Chemical abundances in seven red giants of NGC 2360 and NGC 2447

Chemical abundances of about fifteen elements from oxygen to europium are measured in seven red giants of the two open clusters NGC 2360 and NGC 2447. The effective temperatures of the giants are determined spectroscopically by taking advantage of their known masses (~2 Mo in NGC 2360 and ~3 Mo in NGC 2447) and bolometric magnitudes. The average iron abundances we obtain for the two clusters are [Fe/H]=0.07 for NGC 2360 and [Fe/H]=0.03 for NGC 2447. Evolutionary stellar model calculations are performed in the mass range 1-4 Mo in order to analyze the surface Na and O abundances predicted after the first dredge-up. The sodium abundance shows a well defined correlation with stellar mass in the 2-3 Mo range. The agreement between our Na abundance determinations in NGC 2360 and our model predictions at 2 Mo is very good. In contrast, the overabundance in one of the three stars in NGC 2447 exceeds that predicted at 3 Mo by ~0.08 dex, which is significant compared to the observational error bars. The effects of core overshooting, convection prescription, metallicity and nuclear reaction rates on the Na surface predictions of our models are investigated. An oxygen deficiency relative to iron by 0.2 dex is measured in our stars, in disagreement with our model predictions. Assuming that the Sun is 0.1-0.3 dex enriched in oxygen relative to neighbor stars could explain the discrepancy.Comment: 11 pages, 8 figures, accepted for publication in Astronomy and Astrophysic

Pengaruh Naungan dan Zat Pengatur Tumbuh terhadap Pertumbuhan dan Hasil Tanaman Kentang Kultivar Atlantik di Dataran Medium

Use of shade on the cultivation of potato in medium altitude is expected to reduce both light intensity and temperature, and therefore is more suitable for potatoes to grow in medium altitude. While the use of growth regulators subtances improving the process of assimilate distribution from the leaves to the tuber. Therefore use of shade followed by plant growth regulators applications are expected to increase of growth and yield. The objectives of the experiment were to determine growth and yield of potato cultivar Atlantik grown at medium altitude with different types of shading and plant growth regulators. The experiment was conducted at an experimental station of the Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang, at an altitude 685 m asl. The experiment was arranged in a split plot design consisting of two factors and three replications. The main plots were types of shading (without shading, paranet 45%, UV polyethylene, and corn plant) and the sub plots were combination of plant growth regulators (benzylaminopurine + paclobutrazol), (benzylaminopurine +chloro choline chloride), benzylaminopurine, paclobutrazol, chloro choline chloride). The results showed that the effect of interaction between shading and plant growth regulator on growth and yield of the potato were not significant. Paranet shade and corn plant shade increased plant height, leaf area index, tuber weight per plant, yield per hectar and tuber grade A of potato cultivar Atlantik. Corn plant shading gave potato yield 21.6 ton ha-1 with 64% grade A tuber. Paclobutrazol decreased potato plant height, but increased number of tuber per plant and yielded highest tuber weight of 702.1 per plant (23.3 ton ha-1 ), with 70.9% grade A tuber

Transfer RNA Genes Affect Chromosome Structure and Function via Local Effects

The genome is packaged and organized in an ordered, non-random manner and specific chromatin segments contact nuclear substructures to mediate this organization. Transfer RNA genes (tDNAs) are binding sites for transcription factors and architectural proteins and are thought to play an important role in the organization of the genome. In this study, we investigate the role of tDNAs in genomic organization and chromosome function by editing a chromosome so that it lacks any tDNAs. Surprisingly our analyses of this tDNA-less chromosome show that loss of tDNAs does not grossly affect chromatin architecture or chromosome tethering and mobility. However, loss of tDNAs affects local nucleosome positioning and the binding of SMC proteins at these loci. The absence of tDNAs also leads to changes in centromere clustering and a reduction in the frequency of long-range HML-HMR heterochromatin clustering with concomitant effects on gene silencing. We propose that the tDNAs primarily affect local chromatin structure that result in effects on long-range chromosome architecture

Near-UV to near-IR disk-averaged Earth's spectra from Moon's Earthshine observations

We discuss a series of Earthshine spectra obtained with the NTT/EMMI instrument between 320nm and 1020nm with a resolution of R~450 in the blue and R~250 in the red. These ascending and descending Moon's Earthshine spectra taken from Chile give disk-averaged spectra for two different Earth's phases. The spectra show the ozone (Huggins and Chappuis bands), oxygen and water vapour absorption bands, and also the stronger Rayleigh scattering in the blue. Removing the known telluric absorptions reveals a spectral feature around 700nm which is attributed to the vegetation stronger reflectivity in the near-IR, so-called vegetation red-edge.Comment: 2 pages, 1 figure, proceedings from a poster at 'Semaine de l'Astrophysique Francaise', 27th june-1st july 2005, Strasbour