Calculation of the static and dynamical correlation energy of pseudo-one-dimensional beryllium systems via a many-body expansion

Low-dimensional beryllium systems constitute interesting case studies for the test of correlation methods because of the importance of both static and dynamical correlation in the formation of the bond. Aiming to describe the whole dissociation curve of extended Be systems we chose to apply the method of increments (MoI) in its multireference (MR) formalism. However, in order to do so an insight into the wave function was necessary. Therefore we started by focusing on the description of small Be chains via standard quantum chemical methods and gave a brief analysis of the main characteristics of their wave functions. We then applied the MoI to larger beryllium systems, starting from the Be6 ring. First, the complete active space formalism (CAS-MoI) was employed and the results were used as reference for local MR calculations of the whole dissociation curve. Despite this approach is well established for the calculation of systems with limited multireference character, its application to the description of whole dissociation curves still requires further testing. After discussing the role of the basis set, the method was finally applied to larger rings and extrapolated to an infinite chain

Tunable biohybrid hydrogels from coacervation of hyaluronic acid and PEO‐based block copolymers

Accurately tuning the macroscopic properties of biopolymer‐based hydrogels remains challenging due to the ill‐defined molecular architecture of the natural building blocks. Here, we report a biohybrid coacervate hydrogel, combining the biocompatibility and biodegradability of naturally occurring hyaluronic acid (HA) with the tunability of a synthetic polyethylene oxide (PEO) ‐based ABA‐triblock copolymer. Coacervation of the cationic ammonium or guanidinium‐functionalized copolymer A‐blocks with the anionic HA leads to hydrogel formation. Both mechanical properties and water content of the self‐healing hydrogels can be controlled independently by altering the copolymer structure. By controlling the strength of the interaction between the polymer network and small‐molecule cargo, both release rate and maximum release are controlled. Finally, we show that coacervation of HA and the triblock copolymer leads to increased biostability upon exposure to hyaluronidase. We envision that noncovalent crosslinking of HA hydrogels through coacervation is an attractive strategy for the facile synthesis of tunable hydrogels for biomedical applications

Antioxidant Activity Analysis Of Cynara Scolimus L., Artemisia China L., Borreria Repensdc.,polygala Paniculata L. From Taman Nasional Gunung Merapi Using Dpph (2,2-difenil-1-pikrilhidrazil) Radical Scavenging Analysis

Taman Nasional Gunung Merapi (TNGM) has various biodiversities which need to be explored. This study aims to analyze antioxidant activity four plants from Asteraceae, Rubiaceae and Polygalaceae which were collected from TNGM. Antioxidant activity is analyzed by DPPH radical capturing method using spectrophotometer. Sampel is extracted gradually by wasbenzen and methanol. DPPH radical capturing analysis shows that IC50 score of Cynara scolimus L. wasbenzen extract is 496,16g/mL; Artemisia China L. 407,86g/mL; Borreria repens DC. 984,04 g/mL and Polygala paniculata L. 633,34 g/mL. The IC50 score of methanol extract Cynara scolimus L. is 334,94g/mL; Artemisia China L. 199,99g/mL; Borreria repens DC. 402,28 g/mL and Polygala paniculata L. 77,00 g/mL . Thin layer chromatography analysis shows that methanol extract of Polygala paniculata L. contains flavonoid

The Gaussian formula and spherical aberration of the static and moving curved mirrors from Fermat's principle

The Gaussian formula and spherical aberrations of the static and relativistic curved mirrors are analyzed using the optical path length (OPL) and Fermat's principle. The geometrical figures generated by the rotation of conic sections about their symmetry axes are considered for the shapes of the mirrors. By comparing the results in static and relativistic cases, it is shown that the focal lengths and the spherical aberration relations of the relativistic mirrors obey the Lorentz contraction. Further analysis of the spherical aberrations for both static and relativistic cases have resulted in the information about the limits for the paraxial approximation, as well as for the minimum speed of the systems to reduce the spherical aberrations.Comment: 15 pages, 7 figures, uses iopart. Major revisions on the physical interpretations of the results. Accepted for publication in J. Op

Women Leadership: Telaah Kapasitas Perempuan sebagai Pemimpin

The challenge of reform and globalisation demands a leader able to manage theOrganization well with everything needed heed for the sake of the achievement goals ofthe organization. Gender differences in leadership is no longer in question. This isevidenced by the women has a characteristic form of capital to become a leader as shownR.A. Kartini as role model for women in Indonesia. Women also have the ability to be aleader who subsequently made the purpose of writing to know the characteristics ofwomen who can bolster the effectiveness of leadership. The results of the deliberations ofthat is there are two types of female leadership style that is transformational andfeminism. As for the support of the leadership style that is the ability to persuade, provethe critics wrong, team work Spirit, has a strong charisma, risk-taking, multitasking andimpatient. By looking at the capabilities of women women should've got a central positionin the development of societ

Mathematical modeling of cell population dynamics in the colonic crypt and in colorectal cancer

Colorectal cancer is initiated in colonic crypts. A succession of genetic mutations or epigenetic changes can lead to homeostasis in the crypt being overcome, and subsequent unbounded growth. We consider the dynamics of a single colorectal crypt by using a compartmental approach [Tomlinson IPM, Bodmer WF (1995) Proc Natl Acad Sci USA 92: 11130-11134], which accounts for populations of stem cells, differential cells, and transit cells. That original model made the simplifying assumptions that each cell popuation divides synchronously, but we relax these assumptions by adopting an age-structured approach that models asynchronous cell division, and by using a continuum model. We discuss two mechanims that could regulate the growth of cell numbers and maintain the equilibrium that is normally observed in the crypt. The first will always maintain an equilibrium for all parameter values, whereas the second can allow unbounded proliferation if the net per capita growth rates are large enough. Results show that an increase in cell renewal, which is equivalent to a failure of programmed cell death or of differentiation, can lead to the growth of cancers. The second model can be used to explain the long lag phases in tumor growth, during which news, higher equilibria are reached, before unlimited growth in cell number ensues

Meningkatkan Hasil Belajar dan Aktivitas Siswa Kelas X-7 SMA Kolese De Britto YOGYAKARTA pada Materi Protista dengan Permainan Edukatif Teka–teki Silang (Tts)

Berdasarkan hasil observasi dan wawancara dengan guru Biologi di SMA Kolese De Britto, didapatkan berbagai permasalahan yaitu siswa kurang aktif, minat baca siswa yang tergolong rendah, kesulitan dalam menyerap bahasa asing, dan program tuntas yang diharapkan oleh guru masih belum tercapai. Penelitian ini dilakukan untuk mengetahui peningkatan hasil belajar dan aktivitas siswa kelas X-7 SMA Kolese De Britto Yogyakarta pada materi Protista dengan metode permainan edukatif teka-teki silang. Penelitian tindakan kelas ini dilaksanakan dalam 2 siklus.Setiap siklus terdiri dari 5 tahapan, yaitu (1) Perencanaan, dilakukan untuk mengidentifikasi masalah dan merencanakan kegiatan pembelajaran seperti mempersiapkan perangkat pembelajaran dan membuat instrumen penelitian.(2) Pelaksanaaan, yaitu melaksanakan kegiatan belajar mengajar dengan menggunakan metode permainan edukatif teka-teki silang. (3) Observasi, pengambilan data tentang proses pembelajaran di dalam kelas. (4) Evaluasi, dilakukan untuk mengetahui peningkatan hasil belajar melalui tes evaluasi dan aktivitas siswa dalam hal bertanya dan menjawab melalui lembar observasi aktivitas siswa. (5) Refleksi, dilakukan untuk menganalisa data hasil penelitian untuk mengetahui kelebihan dan kekurangan di setiap siklusnya. Subyek penelitian adalah 37 siswa kelas X-7 SMA Kolese De Britto Yogyakarta. Hasil penelitian menunjukkan adanya korelasi yang cukup kuat antara peningkatan aktivitas dengan hasil belajar siswa yaitu sebesar 0,51. Semakin tinggi aktivitas siswa maka semakin tinggi pula hasil belajarnya. Persentasi siswa yang mencapai ketuntasan minimal pada siklus I sebesar 78,38% dan mengalami peningkatan pada siklus II menjadi 91,89%. Nilai rata-rata kelas siklus I sebesar 82,72 dan mengalami peningkatan pada siklus II menjadi 88,64. Aktivitas siswa pada siklus I sebesar 51,35% dan mengalami peningkatan pada siklus II yaitu menjadi 86,50 %. Berdasarkan data tersebut dapat disimpulkan permainan edukatif teka-teki silang dapat meningkatkan hasil belajar dan aktivitas siswa kelas X-7 SMA Kolese De Britto Yogyakarta pada materi Protista