DESKRIPSI HEMATOLOGI KELELAWAR DI GUNUNG TANGKOKO BERDASARKAN PEMERIKSAAN DARAH LENGKAP

ABSTRACTThis study aimed to describe the hematological data of several bat species netted on Mount Tangkoko based on a complete blood examination. Purposive Random Sampling method was used for field sampling, Mistnet method was used for bats sampling and Screening Test method was used for hematological examination. Blood was examined using the Abx Micros 60 Hiruba Medical machine. The examined blood components were erythrocytes, leukocytes, haemoglobin, haematocrit, and platelets/thrombocytes. The examination results showed that each blood component had different amount compared to humans, some other mammals with relativity in size and some other birds. The highest leukocyte count was found in T. nigrescens which was 28.00 ± 19.04 × 103/mm3. The highest erythrocyte count was found in T. nigrescens which was 13.45 ± 1.52 × 106/mm3. The highest haemoglobin and haematocrit count were found in R. amplexicaudatus which were 19.70 ± 1.89 g/dl and 65.70 ± 5.65%. The highest platelet/thrombocyte count was found in T. nigrescens which was 975.2 ± 239.03 × 103/mm3.Keywords: Bats, Mount Tangkoko, Erythrocytes, Leukocytes, Haemoglobin, Haematocrit, Platelets ABSTRAKPenelitian ini bertujuan untuk mendeskripsikan data hematologi beberapa spesies kelelawar yang terjaring di Gunung Tangkoko berdasarkan pemeriksaan darah lengkap. Sampling lokasi menggunakan metode Purposive Random Sampling, penangkapan kelelawar menggunakan metode Mistnet dan pemeriksaan hematologi menggunakan metode Screening Test. Darah diperiksa menggunakan mesin Abx Micros 60 Hiruba Medical. Hasil menunjukan lima komponen darah yaitu eritrosit, leukosit, hemoglobin, hematokrit, dan platelet/trombosit masing-masing memiliki perbedaan dengan manusia dan beberapa spesies mamalia lain dengan ukuran yang relatif sama serta beberapa spesies burung sebagai pembanding. Nilai leukosit tertinggi terdapat pada spesies T. nigrescens yaitu 28,00 ± 19,04 × 103/mm3. Nilai eritrosit tertinggi terdapat pada spesies T. nigrescens yaitu 13,45 ± 1,52 × 106/mm3. Nilai hemoglobin dan hematokrit tertinggi terdapat pada spesies R. amplexicaudatus yaitu masing-masing 19,70 ± 1,89 g/dl dan 65,70 ± 5,65%. Nilai platelet/trombosit tertinggi terdapat pada spesies T. nigrescens yaitu 975,2 ± 239,03 × 103/mm3. Kata kunci : Kelelawar, Gunung Tangkoko, Leukosit, Eritrosit, Hemoglobin, Hematokrit, Leukosi

KELIMPAHAN DAN KEKAYAAN SPESIES KELELAWAR DI GUNUNG TANGKOKO SULAWESI UTARA

ABSTRACT Bats are included into Chiroptera that originally derived from Greek. “Cheir” means hand and “Pteros” means wing or on the different side we can say it “wing hand”. Bats are mammals that can fly. They are nocturnal because they are active to find their food, flying at midnight, sleeping by hanging upside down during the day. They habitually do that kind of sleep because bat wings only have slight membrane which are susceptible to sunlight. Bats have two Ordo, they are Megachiroptera dan Microchirotera. The purpose of this research is to analyze abundance and richness of Bat Species in Tangkoko Mountain North Sulawesi. The method applying in this research is purposive sampling method by using Mist net. The locations of this research are coastal forest, lowland forest, sub montane forest, and moss forest. The obtained bats belong to one family, five genus, seven species with the total number of individuals is 260 bats. The species of the netted bats are Thoopterus nigrescens, Rosettus celebensis, R. amplexicaudatus, Macroglossus minimus, Nyctimene cephalotes, Cynopterus brachyotis, and Cynopterus luzoniensis. The catch rate of species of bats on Tangkoko Mountain has the result of abundance, which is calssified as low, that is 0.23 ind/net/hour/day. The richness of bat species at the second location is 1.08 that is classified as low. Keywords : Bats, Abundance, Richness, Tangkoko Mountain, North Sulawesi ABSTRAK Kelelawar termasuk ordo Chiroptera yang berasal dari bahasa yunani  “Cheir” yang berarti tangan dan “Pteros” yang berarti sayap, atau bisa di sebut  sebagai “sayap tangan”. kelelawar merupakan anggota hewan meyusui yang bisa terbang. Kelelawar bersifat nokturnal karena aktif mencari makan, terbang pada malam hari dan tidur dengan bergelantung terbalik pada siang hari. Karena hal tersebut di karenakan sayap kelelawar hanya berupa selaput tipis yang rentan terkena cahaya matahari. Kelelawar memiliki dua sub ordo yaitu sub ordo Megachiroptera dan Microchirotera. Tujuan penelitian ini adalah menganalisis kelimpahan dan kekayaan kelelawar di Gunung Tangkoko Sulawesi Utara. Metode yang digunakan dalam penelitian ini adalah metode purposive sampling dengan menggunakan jaring kabut (Mist net). Titik lokasi penelitian yaitu hutan pantai, hutan dataran rendah, hutan sub montana, dan hutan lumut. Kelelawar yang didapat termasuk ke dalam satu family, lima genus, tujuh spesies dengan jumlah seluruh individu 260 kelelawar. Spesies kelelawar yang terjaring yaitu Thoopterus nigrescens, Rosettus celebensis, R. amplexicaudatus, Macroglossus minimus, Nyctimene cephalotes, Cynopterus brachyotis, dan Cynopterus luzoniensis. Laju tangkapan spesies kelelawar di Gunung Tangkoko, memiliki hasil kelimpahan yang tergolong rendah yaitu sebesar 0.23 ind/net/jam/hari. Kekayaan spesies kelelawar pada kedua lokasi ialah 1,08 yang tergolong rendah.Kata kunci : Kelelawar, Kelimpahan, Kekayaan, Gunung Tangkoko, Sulawesi Utara

Predicting In Vivo Anti-Hepatofibrotic Drug Efficacy Based on In Vitro High-Content Analysis

Background/Aims Many anti-fibrotic drugs with high in vitro efficacies fail to produce significant effects in vivo. The aim of this work is to use a statistical approach to design a numerical predictor that correlates better with in vivo outcomes. Methods High-content analysis (HCA) was performed with 49 drugs on hepatic stellate cells (HSCs) LX-2 stained with 10 fibrotic markers. ~0.3 billion feature values from all cells in >150,000 images were quantified to reflect the drug effects. A systematic literature search on the in vivo effects of all 49 drugs on hepatofibrotic rats yields 28 papers with histological scores. The in vivo and in vitro datasets were used to compute a single efficacy predictor (Epredict). Results We used in vivo data from one context (CCl4 rats with drug treatments) to optimize the computation of Epredict. This optimized relationship was independently validated using in vivo data from two different contexts (treatment of DMN rats and prevention of CCl4 induction). A linear in vitro-in vivo correlation was consistently observed in all the three contexts. We used Epredict values to cluster drugs according to efficacy; and found that high-efficacy drugs tended to target proliferation, apoptosis and contractility of HSCs. Conclusions The Epredict statistic, based on a prioritized combination of in vitro features, provides a better correlation between in vitro and in vivo drug response than any of the traditional in vitro markers considered.Institute of Bioengineering and Nanotechnology (Singapore)Singapore. Biomedical Research CouncilSingapore. Agency for Science, Technology and ResearchSingapore-MIT Alliance for Research and Technology Center (C-185-000-033-531)Janssen Cilag (R-185-000-182-592)Singapore-MIT Alliance Computational and Systems Biology Flagship Project (C-382-641-001-091)Mechanobiology Institute, Singapore (R-714-001-003-271

Influence of Length-Scales on Spatial Distribution and Interfacial Characteristics of B₄c in a Nanostructured Al Matrix

To provide fundamental insight into the influence of length scales on the spatial distribution and characteristics of ceramic/metal interfaces in nanostructured metal matrix composites, we studied an Al alloy reinforced with a broad size distribution of B4C particles, ranging from several nanometers to submicrometers. The B4C was incorporated into an ultrafine grained Al matrix using cryomilling and thermomechanical consolidation. The characteristics of the B4C/Al interface, namely the local chemistry and interfacial structure, were studied in detail using transmission electron microscopy (TEM) and atom-probe tomography. Results reveal significant differences in these characteristics as a function of particle length scale. A significant proportion (~40%) of B4C nanoparticles was located intragranularly, i.e.; within ultrafine grain interiors, whereas submicron B4C particles were surrounded by multiple Al grains, creating intergranular interfaces. Mg-O-N layers, Al2O3 nanoparticles and amorphous regions were observed at the intergranular interfaces, whereas most of the intragranular interfaces were semicoherent and free of other phases or segregation. By combining crystal structure modeling and high-resolution TEM, a specific orientation relationship was identified for the intragranular interfaces: (1 -1 1)Al//(024)B4C, 3.4° angle between (0 0 2)Al and (003)B4C, and 7.8° angle between (2 -2 0)Al and (021)B4C. Mechanisms related to length scale effects on the formation of intragranular versus intergranular interfaces and corresponding structures and chemistries are discussed, as well as the implications of these interface characteristics on strength and ductility

Strengthening Mechanisms and Deformation Behavior of Cryomilled Al-Cu-Mg-Ag Alloy

In the last decade, the commercially available heat-treatable aluminum alloy (AA) 2139 (Al-Cu-Mg-Ag) has generated interest within the aerospace and defense communities because of its high strength and damage tolerance as compared to those of other AA 2XXX alloys. In this work we investigate the possibility of enhancing the performance of AA 2139 via a nanostructuring approach involving the consolidation of cryomilled powders. For comparison purposes, two types of feedstock powders (cryomilled and unmilled, gas-atomized powder), were consolidated via dual mode dynamic forging. Our results show that, following heat treatment (HT), the strength of the cryomilled material increases in the range of ~25% to ~200% relative to that of the unmilled counterparts, depending on specific processing parameters. We present microstructural data, including grain size and precipitate chemistry, to provide insight into the underlying strengthening mechanisms. Vickers microhardess tests are used to evaluate peak heat treatments, and tensile testing is performed to characterize mechanical behavior. The kinetics of precipitation, strengthening mechanisms and deformation behavior are discussed. It is proposed that the combination of elemental segregation with the presence of oxides along grain boundaries, both facilitated by enhanced diffusion paths, are responsible for the observed change in HT kinetics in the cryomilled material

On the thermal stability of ultrafine-grained Al stabilized by in-situ amorphous Al2O3 network

Bulk Al materials with average grain sizes of 0.47 and 2.4μm, were fabricated by quasi-isostatic forging consolidation of two types of Al powders with average particle sizes of 1.3 and 8.9μm, respectively. By utilizing the native amorphous Al2O3 (am-Al2O3) film on the Al powders surfaces, a continuous, ~7nm thick, am-Al2O3 network was formed in situ in the Al specimens. Systematic investigation of the changes to the am-Al2O3 network embedded in the Al matrix upon heating and annealing up to 600°C was performed by transmission electron microscopy (TEM). At the same time, the stability of the Al grain structure was studied by transmission Kikuchi diffraction (TKD), electron back-scatter diffraction (EBSD), and TEM. The am-Al2O3 network remained stable after annealing at 400°C for 24h. In-situ TEM studies revealed that at temperatures ≥450°C, phase transformation of the am-Al2O3 network to crystalline γ-Al2O3 particles occurred. After annealing at 600°C for 24h the transformation was completed, whereby only nanometric γ-Al2O3 particles with an average size of 28nm resided on the high angle grain boundaries of Al. Due to the pinning effect of γ-Al2O3, the Al grain and subgrain structures remained unchanged during annealing up to 600°C for 24h. The effect of the am-Al2O3→γ-Al2O3 transformation on the mechanical properties of ultrafine- and fine-grained Al is discussed from the standpoint of the underlying mechanisms.Fil: Balog, Martin. Slovak Academy of Sciences; Eslovaquia. University of California at Davis; Estados UnidosFil: Hu, Tao. University of California at Davis; Estados UnidosFil: Krizik, Peter. Slovak Academy of Sciences; EslovaquiaFil: Castro Riglos, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Saller, Brandon D.. University of California at Davis; Estados UnidosFil: Yang, Hanry. University of California at Davis; Estados UnidosFil: Schoenung, Julie M.. University of California at Davis; Estados UnidosFil: Lavernia, Enrique J.. University of California at Davis; Estados Unido

Hybrid thoracoscopic and transvenous catheter ablation of atrial fibrillation

The hybrid approach combines an epicardial ablation with a percutaneous endocardial ablation in a single-step or sequential procedure. This study provides an overview of the hybrid procedure for the treatment of stand-alone atrial fibrillation (AF). Papers selected for this review were identified on PubMed and the final selection included nine studies. The total number of patients was 335 (range 15-101). Mean age ranged from 55.2 to 62.9 years. The hybrid approach achieved satisfactory results, with AF-antiarrhythmic drug-free success rates higher than those in isolated procedures. In particular, the bilateral approach with a bipolar device showed a high success rate independently of the AF type and seems to be the better choice for the hybrid procedure. Despite good preliminary results, large, multicentre trials of hybrid AF ablation that target a population of patients with long-standing persistent disease are necessary to establish whether this approach may represent, in the future, a gold-standard treatment for AF

Scalable encapsulation of hepatocytes by electrostatic spraying

Encapsulating cells by polyelectrolyte complex coacervation can be accomplished at physiological temperature and buffer conditions. One of the oppositely charged polyelectrolytes in the microcapsule core can be collagen or any other natural extra-cellular matrices suitable for cellular support while the other polyelectrolyte forms the ultra-thin shell to ensure efficient mass transfer. These microcapsules with ultra-thin shell are difficult to produce in large quantities due to their fragility. In this study, electrostatic spraying technique was used to achieve a scalable production of one such type of microcapsules formed by complex coacervation between the cationic methylated collagen and anionic terpolymer of hydroxylethyl methacrylate, methyl methacrylate and methylacrylic acid (HEMA–MMA–MAA). It was found that the microcapsule sizes were dependent on several important operational parameters, such as the diameter of the spraying needle, the flow rate of the hepatocytes–collagen mixture and the voltage of the electrical field. The microcapsules with diameters of 200–800 μm and a narrow size distribution (standard deviation of 5–28%) were successfully produced. The above parameters also influenced the hepatocyte viability and functions. With a practical encapsulation rate of up to 55 ml/h per orifice required in bio-artificial liver-assisted device applications, we have produced large quantities of microcapsules maintaining comparable cell viability (>87%), mechanical stability and bio-functions to the manually extruded microcapsules