Judul: Suplementasi somatotropin untuk memperbaiki tampilan fisologis tikus jantan umur 6 dan 12 bulan
Abstrak: Penuaan sangat berhubungan dengan penurunan sekresi growth hormone (GH) dari pituitari anterior. Somatotropin atau grown hormone (GH) bekerja pada semua sel somatik atau sel tubuh. Penurunan sekresi GH mengganggu fungsi sel tubuh. Tujuan penelitian ini adalah untuk mengukur perbaikan tampilan fisiologis tikus umur 6 dan 12 bulan yang disuntik somatotropin.
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Judul: Suplementasi Somatotropin untuk Memperbaiki Tampilan Fisiologis Tikus Betina Usia Enam Bulan dan Satu Tahun.
Abstrak: As age increases, aging symptoms such as decrease of stamina, wrinkle of skin, osteoporosis, increase of body fat and menopause will appear. These symptoms are due to the decrease of somatotropin secretion which plays a significant role in cell proliferation. The objective of this study is to investigate the effects of somatotropin supplementation on physiological performaces of six-month and one-year old female rats. Forty eight female rats were assigned into a randomized block design with 4 factors. The first factor was age with 2 levels (6 months and 12 months). The second factor was somatotropin dosage with 2 levels (0 and 9 mg/kg body weight). The third factor was duration of injection with 2 levels (3 weeks and 6 weeks), and the fourth factor was sampling period with 2 levels (0 and 14 days after somatotropin termination). Parameters measured were body weight, total DNA and total RNA of ovary and uterus, plasma estrogen and progesteron levels, bone collagen and skin collagen consentrations. The results showed that somatotropin supplementation had significant effects on body weight, ovary weight, total cell of ovary, total cell of uterus, plasma estrogen and progesteron levels, bone and skin collagen concentrations. It is concluded that somatotropin improve physiological performances of aging female rats.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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