Judul: IPB (Bogor Agricultural University)
Abstrak: Pasak bumi is popular in the traditional medical herb that is believed can increase the secondary reproduction characters such as: 1. libido and 2. the duration of erection. Here a reported the research that focus on: 1. sexual behavior of the male white rat treated by pasak bumi. and the better dose of pasak bumi that indicated highest libido. 2. mechanism of pasak bumi in the hypophysis cells that produce reproduction hormones including: acidophile and basophile cells distribution, the response of luteinizing hormone (LH) cells and the response of follicle stimulating hormone(FSH) cells. 3. The works of pasak bumi in the production of testosteron 4. The works of pasak bumi in the development stage of spermatogenesis in the seminiferous tubule. 5. The works of pasak bumi in the quality of semen in cauda epididymis including profile of cauda epididymis ductus diameter, some parameters of macroscopical and microscopical semen quality. Research carried out in five experiments; experiment 1. using the designed cage to observe the male white rat behavior seduced by female oestrus in separating wire net. Then, the male white rat administered orally by various doses of pasak bumi to find out the best dose. Experiment 2, using HE staining method to study micromorphological distribution of the acidophile and basophile cells in hypophysis, and using immunohistochemical staining method to study the response of LH cells of the male rat hypophysis treated by pasak bumi, also using immunohistochemical staining method to study the response of FSH cells. Experiment 3.using the RIA method to measure testosterone level in blood serum. Experiment 4.using HE staining method to study micromorphological of the profile of spermatogenesis stage in the seminiferous tubule. Experiment 5.using HE staining method to study micromorphological of the diameter of cauda epididymis, also doing macroscopical and microscopical semen quality in the cauda epididymis. Result of the research showed that: 1. Sexual behavior that reflected the male white rat libido were: a. face to face meeting, b. moving close to wire net partition, c. scratching the wire net partition. 2.The optimal dose of pasak bumi resulted highest libido was 18 mg/200 g bw (body weight) compared with 100 mg/200 g bw, 200 mg/200 g bw, and the control (1 ml aquadest). 3. Basophyle cells increased significantly in the third day of pasak bumi administration; LH cells strongly significantly response to produce LH hormone within cells in the third day; FSH cells weakly response (non significantly) to produce FSH hormone within cells in the third day. 4. The level of testosterone in plasma increased significantly in the third day of pasak bumi administration. 5. The last spermatid actively increased in the third day. 6. The quality of semen in the cauda of epididymis increased significantly in the third day of pasak bumi administration.
Keyword: pasak bumi, libido, LH cells, FSH cells, testosterone, semen quality

Judul: Histomorfologi tubulus seminiferus dan kelenjar prostat tikus (Rattus Norvegicus) serta konsentrasi hormon androgen pasca pemberian ekstrak purwoceng (Pimpinella Alpina Molk.)
Abstrak: Indonesia is one of the countries which has many kinds of herbal plants. Pimpinella alpina Molk. well known as purwoceng is one of Indonesian herbal plants which have aphrodisiaca actions may enhance libido in males. Moreover, it has been reported that an increase the levels of LH (lutheinizing hormone) and testosterone in blood serum of male rats given the purwoceng extract. The increase of the LH and testosterone level thought to affect the primary and secondary organs in males and level of androgens hormones (testosterone and dihydrotestosterone or DHT). The objective of these experiment was to determine the spermatogenesis, prostate glands activity and the production of androgen hormone (testosterone and DHT) of rats after given of purwoceng extract and it influence of dose and age. The treatment were given orally for 14 days in three age groups (puberty, adult and old) of male rats by received the dose of 25 mg and 50 mg and 0 mg as control. The results shows an increase of the stage of spermatogenesis in the seminiferous tubules after all age groups received purwoceng extract with 50 mg dose of purwoceng was the best since it had the highest response. In addition, these experiment shows there has been an increase of the percentage of prostate glands activity producing prostate fluid. The animals who received the 50 mg purwoceng extract showed the highest response at any age. The effect of the purwoceng extract on the concentrations of androgens (testosterone and DHT) was higher and lower in some age group, but has not perfomed significant effects (p> 0.05). In conclusion of these experiment shows the stage of spermatogenesis, prostate glands activity and the production of androgen hormones increases at all ages, while at the age of puberty the DHT hormone production decreases after giving purwaceng extract.
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Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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