Search

We measure the star formation rate (SFR) per unit gas mass and the star formation efficiency (SFE$_{\rm gas}$ for total gas, SFE$_{\rm mol}$ for the molecular gas) in 81 nearby galaxies selected from the EDGE-CALIFA survey, using $^{12}$CO(J=1-0) and optical IFU data. For this analysis we stack CO spectra coherently by using the velocities of H$\alpha$ detections to detect fainter CO emission out to galactocentric radii $r_{\rm gal} \sim 1.2 r_{25}$ ($\sim 3 R_{\rm e}$), and include the effects of metallicity and high surface densities in the CO-to-H$_2$ conversion. We determine the scale lengths for the molecular and stellar components, finding a close to 1:1 relation between them. This result indicates that CO emission and star formation activity are closely related. We examine the radial dependence of SFE$_{\rm gas}$ on physical parameters such as galactocentric radius, stellar surface density $\Sigma_{\star}$, dynamical equilibrium pressure $P_{\rm DE}$, orbital timescale $\tau_{\rm orb}$, and the Toomre $Q$ stability parameter (including star and gas $Q_{\rm star+gas}$). We observe a generally smooth, continuous exponential decline in the SFE$_{\rm gas}$ with $r_{\rm gal}$. The SFE$_{\rm gas}$ dependence on most of the physical quantities appears to be well described by a power-law. Our results also show a flattening in the SFE$_{\rm gas}$-$\tau_{\rm orb}$ relation at $\log[\tau_{\rm orb}]\sim 7.9-8.1$ and a morphological dependence of the SFE$_{\rm gas}$ per orbital time, which may reflect star formation quenching due to the presence of a bulge component. We do not find a clear correlation between SFE$_{\rm gas}$ and $Q_{\rm star+gas}$., Comment: 24 pages, 12 figures, 1 Table

Preliminary yield trials (PYTs) are one of the steps in cultivar development of cassava by testing, characterizing, and selecting the promising clones. The objective of this study was to evaluate the yield of cassava clones in the University of Lampung Experimental Station, Natar, South Lampung. This study consisted of two experiments, Experiment A and B. A completely randomized block design was used for both experiments. Experiment A and B evaluated 17 clones with two replications and 13 clones with three replications respectively. Cultivar UJ 5 was used as the standard for both experiments. BL 100 produced starch weight per plant (0.21 kg), higher than the standard UJ 5 (0.11 kg). Nibung produced starch weight per plant (0.50 kg), higher than the standard UJ5 clone (0.37 kg). BL 100, Kasetsart Ungu, UJ 3 Kc and BL-01 were the promising clones selected from Experiment A. Nibung, Randu, Korem Gatam, and MU 111 were the promising clones selected from Experiment B.

Bengawan Solo river 548.53 km is the longest river in Java Island Indonesia, which crosses provinces of Central Java and East Java. Bengawan Solo river is heavily polluted by agricultural, industrial and domestic wastes, especially in Surakarta Residence, Central Java. The impacts of pollution in Bengawan Solo river are poor water quality, the population of native fish has declined sharply and some were almost extinct. The fish that develop was Sailfin catfish (Pterygoplichthys pardalis) because these fish were resistant to pollution. The study aimed to determine the growth parameters of Sailfin catfish (P. pardalis) in Bengawan Solo river. Estimation of growth parameter using length frequency data analysis was done using the FISAT program package. The results of growth parameters of Sailfin catfish (P. pardalis) showed that infinity length (L∞) = 41.75 cm; acceleration of growth (K) = 0.48 cm/year. Natural mortality (M) = 1,1; fishing mortality (F) = 2.47; and total mortality (Z) = 3.57. Exploitation rate (E) = 0.69. The conclusion is the fishing mortality of Sailfin catfish is quite high, while natural mortality is low because the fish are resistant to pollution.

Batanghari River is one of the fishing locations in Jambi Province, Indonesia. One of the commercial freshwater fish in this river is silver shark minnow Osteochilus vittatus. Presently, there was no study on the bioecology of this species in Batanghari river. Therefore, the aims of this research were to analyze the growth pattern, reproduction, and food habits of silver shark minnow in Batanghari River, Indonesia. Data were collected in February, April, June, September, and October 2018. The samples were preserved with alcohol 70%. The length-weight relationships were analyzed using the linear allometric model, gonad maturity was observed by morphologically, and fecundity was calculated by the gravimetric method. The results showed that this fish had an isometric growth pattern. The fish fed on phytoplankton and indicated as herbivorous plankton feeder. Bacillariophyceae and Chlorophyceae were predominant food items. The fish spawn around the year partially with fecundity between 2,726 - 19,202 eggs. The gonad maturity index ranges from 5.38% to 11.44%, and the egg diameter ranged from 0.40 to 1.27 mm.