Si può desiderare di provare un trattamento naturale disfunzione erettile come un diverso per i problemi di costruzione. Al giorno d oggi ci sono diverse terapie sul mercato, ma un trattamento naturale disfunzione erettile è stato confermato qualche ora e ora di nuovo per dare risultati efficienti e permanenti. Cos è la disfunzione sessuale? L incapacità di sviluppare o sostenere una costruzione abbastanza lungo per fare l amore è chiamato disfunzione erettile, ED https://farmacia-senzaricetta.it/ o (maschio) problemi di erezione. Tutti gli uomini possono avere problemi di costruzione di volta in volta e gli scienziati considerano ED essere presenti se si verificano problemi di costruzione almeno il 25% del tempo. Alcuni fatti duri: ED Può essere dovuto a problemi emotivi. Stress, pressione, giltiness, depressione, bassa autostima e ansia prestazioni può essere la causa dei vostri problemi di costruzione. La ricerca ha confermato che il 90 per cento della disfunzione erettile è fisica in origine, non emotiva. L impotenza colpisce la maggior parte degli uomini durante la loro vita e può essere dovuto a troppo colesterolo, problemi cardiaci, diabete, ipertensione, fumo o alcol. Alcuni rimedi possono essere la ragione. Le questioni legate al movimento sono collegate. Se ti occupi dei tuoi problemi di movimento, hai piu possibilita di risolvere questo problema. Qui ci sono 5 consigli facili su come aumentare la circolazione: 1. Mangia i pasti giusti. Questo ti rendera il flusso sanguigno ovvio. Una grande parte di rimanere sani e anche mantenere il flusso sanguigno ovvio è legato al vostro piano di alimentazione quotidiana e quello che si mangia. Una buona cura per la disfunzione erettile è mangiare un piano a basso contenuto di grassi e grande alimentazione di fibre. Mangiare fibre tutti i giorni e questo viene scoperto in prodotti cerealicoli cereali integrali, frutta e verdura. Evitare il più possibile pasti pronti o pasti non sani. 2. Wonder herbal rimedi. Molti rimedi vegetali per ED eseguire bene come possono migliorare il movimento. Hanno molto meno reazioni avverse rispetto ai farmaci convenzionali e si svolgono in modo efficiente per migliorare hardons e la forza, troppo. Erbe naturali come Ginkgo Biloba sono utilizzati come una strategia per ED. Gli specialisti di erboristeria credono anche che le spezie o le erbe come noce moscata, portano al movimento intorno al corpo, tra cui il pene. 3. Vitamine naturali vitali. Gli scienziati sanitari hanno scoperto che una mancanza di supplemento è tipico tra gli uomini con ED in particolare vitamina A. Se si ha una mancanza del nutriente ossido di zinco, Questo è stato confermato per portare alla disfunzione erettile. Queste inadeguatezze derivano dal fatto che molti valori nutrizionali in quello che mangiamo piano non sono sufficienti. Aggiungere al vostro fabbisogno di nutrienti aumenterà la circolazione del sistema e migliorare questa condizione. Gli integratori alimentari sono completamente naturali, quindi non dovrete preoccuparvi dei rischi di reazioni avverse. Inoltre, queste vitamine naturali sono utili per il vostro benessere over-all. Oltre a questi vantaggi benessere, disfunzione erettile vitamine naturali e integratori costano molto meno di farmaci rimedi. 4. Esercitare. Fai una mossa e non un tablet vibrante. Camminare farà di più per migliorare e sostenere hardons di qualsiasi altra compressa chimica nel lungo periodo. Il fitness fisico manterrà bassi livelli di pressione e mantenere grandi stadi di movimento. Andando per un 20-30 minuti di movimento rapido ogni giorno, può affrontare questo problema e può sostenere la vostra libido senza l uso di qualsiasi farmaco. 5. Sottolineare. Questo è il peggior attaccante per problemi di erezione. Scopri diversi metodi per riposare. Alcuni metodi tipici per riposare includono la lettura di un libro, la meditazione, un bagno rilassante o allenamenti di respirazione. Sto solo imparando alcuni semplici allenamenti di respirazione che possono migliorare significativamente il movimento nel reparto pantaloni. Una naturale disfunzione erettile soluzioni di trattamento stanno diventando sempre più popolare con gli uomini. Questi rimedi a base di erbe sono preferiti perché non hanno reazioni avverse e sono confermati essere efficiente come il farmaco. La maggior parte degli uomini combattere parlano dei loro problemi, in particolare la disfunzione erettile come c è poca discussione sui problemi di erezione. La verita e che ED ha un impatto su piu di dieci milioni di uomini solo negli Stati Uniti. Non siete soli e l aiuto è disponibile.

Microsoft word - rakuambo

In vitro effect of medicinal plants used to treat erectile dysfunction on smooth
muscle relaxation and human sperm
N.C. Rakuambo, J.J.M. Meyer, A. Hussein, C. Huyser, S.P. Mdlalose and T.G.
Raidani

Abstract
Chloroform and ethanol extracts of root bark of Securidaca longepedunculata, Wrightia natalensis and Rhoicissus tridentata were investigated for their in vitro activity on the contraction of corpus cavernosal smooth muscle of white New Zealand rabbits. Some of the extracts of these plants relaxed the corpus cavernosal smooth muscle at low concentrations. The highest activity was obtained from Securidaca longepedunculata chloroform extracts at a concentration of 13.0 mg/ml, which induced 66.6% relaxation. Viagra was used as a positive control in this study. Extracts of Securidaca longepedunculata added to human spermatozoa affected certain sperm parameters negatively at 6.5 mg/ml and higher whilst there was no effect at 1.0 mg/ml. Article Outline
1. Introduction 2. Materials and methods 2.1. Plant material 2.2. Plant extraction for smooth muscle relaxation experiment 2.3. Plant extraction for sperm parameter experiment 2.4. Preparation of corpus cavernosal smooth muscle 2.5. Smooth muscle relaxation bioassay 2.6. Sperm processing, motility, vitality and membrane integrity 2.7. Statistical analysis 3. Results 3.1. Smooth muscle relaxation 3.2. Effect of extracts on sperm parameters 4. Discussion Acknowledgements References 1. Introduction
Despite of all the advances in modern and orthodox medicine, traditional medicine still plays a significant role in the lives of many people, particularly in Venda (a region in the Limpopo province of South Africa) (Mabogo, 1990). Erectile dysfunction, known clinically as an inability to obtain or maintain an erection (Guirguis, 1998) is a medical problem affecting young as well as old men. A recent male aging study showed that 52% of respondents have some degree of erectile dysfunction, with 35% of men aged 40–70 reporting moderate or complete impotence (Morgentaler, 1999). Although a number of treatments became available in the last two decades, problems with costs, efficacy, safety and ease to administer were experienced. These treatments ranged from herbal remedies used by native healers, mostly in the Eastern countries, to the more sophisticated designer drugs, which are based on a better understanding of the physiological mechanism of erection (Guirguis, 1998). A number of herbal plants such as Securidaca longepedunculata (Fresen) (Polygalaceae), Wrightia natalensis (Stapf) (Apocynaceae) and Rhoicissus tridentata L.f. (Wild and R.B. Drumm) (Vitaceae) found in Venda are used to treat erectile dysfunction. Securidaca longepedunculata is used as a general remedy for several other ailments such as coughs, colds, fever, backache, toothache, sleeping sickness, venereal disease, malaria, inflammation, rheumatism, snakebite, tuberculosis, ulcers and pneumonia (Galeffi et al., 1990). However, there has been no scientific investigation on the in vitro activity of erectile dysfunction of these species. Palgrave (1977) reported that Securidaca longepedunculata is also used as a contraceptive. Very few scientific studies have been conducted on herbal plants used in the treatment of infertility. Ondrizek et al., 1999 and Ondrizek et al., 1999 reported the effect of extracts of Hypericum perforatum, Serenoa repens, Sabal serrulatum and Ginkgo biloba on sperm cells. The results indicated that at a concentration of 0.6 mg/ml motility was inhibited within an hour of incubation by Hypericum perforatum and after 24 h of incubation by Serenoa repens (9.0 mg/ml) suggesting a spermicidal effect. This study was conducted to investigate whether extracts of these three species have a direct relaxing effect on rabbit corpus cavernosum smooth muscle and also to analyse the effect of Securidaca longepedunculata extracts on human sperm cells. 2. Materials and methods
2.1. Plant material
The root bark of Securidaca longepedunculata, Wrightia natalensis and Rhoicissus tridentata were collected in Venda (South Africa) during June 1999. Voucher specimens (NCR. 16, 17 and 18, respectively) were deposited and identified at the H.G.W.J. Schweickerdt Herbarium (PRU), University of Pretoria. 2.2. Plant extraction for smooth muscle relaxation experiment
Chloroform extracts of root bark of Securidaca longepedunculata (40.6 g), Wrightia natalensis (55.6 g) and Rhoicissus tridentata (12.7 g) were prepared by homogenizing the powdered root bark in chloroform (3.0 l) and stirring under reflux for 12 h. The extracts were filtered and concentrated to dryness under reduced pressure at 37 °C. The resultant residue was later dissolved in 1.0% dimethylsulfoxide (DMSO) to concentrations of 100.0, 50.0 and 1.0 mg/ml. Ethanol extracts of root bark of Securidaca longepedunculata (39.9 g), Wrightia natalensis (51.8 g) and Rhoicissus tridentata (12.6 g) were prepared as described for chloroform extracts. 2.3. Plant extraction for sperm parameter experiment
An ethanol extract of Securidaca longepedunculata was prepared by homogenizing 38.3 g of the powdered root bark in ethanol and extracting it for 24 h. The extract was filtered and concentrated to dryness under reduced pressure at 37 °C. The resultant residue was dissolved in Ham's-F10 solution (Sigma) prepared with deionised, double sterilized endotoxin-free Baxter water (Sabax, Adcock Ingram). The solution was supplemented with 0.2452 g Ca-lactate (Sigma), 0.05 g penicillin-G (Sigma) and 2.1060 g sodium bicarbonate (Sigma). The media was filter sterilized (Sartorius, Minisart 0.2 μm filter) and equilibrated to a pH of 7.3–7.4. An Osmomat 030 (Cryoscopic osmometer, Gynotec) was used to adjust the osmolarity of the media to 283.0 ± 1 mOsm/kg (before use). Similarly, the media was adjusted to 293, 312.0, 377.0 and 440.0 mOsm/kg to compare these elevated osmolarities and extract concentrations on sperm motility. 2.4. Preparation of corpus cavernosal smooth muscle
The entire penis of New Zealand rabbits (mass 2.0–2.3 kg) was kept in Krebs-phosphate buffered saline aerated with 95.0% O2 and 5.0% CO2 for less than 30 min. One or two strips of the corpus cavernosum smooth muscle (12 mm long and 1–2 mm thick) were dissected from each penis. The strips were mounted in an organ-bath chamber containing Krebs solution (pH 7.3) with the following composition: NaCl = 7.01 g/l, KCl = 0.34 g/l, KH2PO4 = 0.1 g/l, NaHCO3 = 1.99 g/l, CaCl2 = 0.2 g/l, MgSO4 = 0.3 g/l and 2.5. Smooth muscle relaxation bioassay
Strips of rabbit corpus cavernosum smooth muscle were mounted in a perfusion bath, with one end tied to the inside bottom of the perfusion bath and the other end to a thin wire connected to a Harvard isotonic force transducer for tension measurements (Drewes et al., 2002). Changes in isotonic tension were recorded on a chart polygraph by a recorder. The corpus cavernosum muscle was perfused with 2 ml Krebs-PSS buffered saline and oxygenated with 95% O2 and 5% CO2 for 5 min to ascertain a stable baseline recording. This was followed by perfusion with 2 ml of CaCl2-PSS (17.8 mg/ml) to achieve muscle contraction. Baseline tension was set at the point of maximal contraction following the addition of calcium chloride into the experimental bath. The extracts to be analyzed were added after a stable contraction baseline had been obtained. The extracts (final concentrations 6.5 and 13.0 mg/ml) were administered through superfusion of the corpus cavernosum smooth muscle in a temperature (37 °C) controlled perfusion bath. A frequency of 12 Hz was used during the experiment. The same procedure was repeated for the positive control, Viagra (Pfizer, 3.2 × 10−5 mg/ml). 2.6. Sperm processing, motility, vitality and membrane integrity
Fresh semen samples were obtained from a single donor to avoid inter-donor variability. Semen analyses were performed according to the protocol of the World Health Organization (WHO, 1999). The semen was washed three times after analysis and layered on top of a discontinuous two-layer colloid gradient of PureSperm® (Nidacon) in a 13.5 ml centrifuge tube. The bottom layer consisted of 1.0 ml of 80.0% PureSperm® in Ham's F10, whilst the next layer contained 1.0 ml of 40.0% PureSperm® in Ham's F10 and 1.0 ml of semen on top. The gradients were centrifuged at 300 × g for 20 min. The supernatant was removed from each tube and the pellet resuspended in 3.0 ml sperm wash medium (Ham's F10 supplemented with human serum albumin serum—HAS [Vitrolife AB]). The tubes were then centrifuged at the same speed for 10 min. The supernatant was removed and washed again with 3.0 ml HSA supplemented Ham's F10 at 300 × g for 10 min. The final sperm-pellet was resuspended in 1.0 ml Ham's F10 (control) supplemented with HSA, or 1.0 ml of medium supplemented with the herbal extract to final concentrations of 1.0, 2.5, 6.5 and 10.0 mg/ml. The sperm was then incubated at 37 °C, under 6.0% CO2, 95% humidity in air with test tube tops loosened (for gaseous exchange) for 48 h. Sperm motility analysis was performed after 0, 4, 24, and 48 h of incubation. Motility was noted as rapid progressive motility or slow or sluggish progressive motility or non-progressive motility. The eosin–nigrosin and the Hypo Osmotic Swelling (HOS) tests (WHO manual, 1999) were performed after 24 and 48 h of incubation to determine sperm vitality and membrane integrity. All counts (motility, eosin–nigrosin and HOS) were performed in triplicate. 2.7. Statistical analysis
Three replicates were used in all experiments and the significance of differences among groups were determined using the Student's t-test, with differences considered significant at P < 0.01 (Colabro et al., 1996 and Keaton and Clark, 1997). 3. Results
3.1. Smooth muscle relaxation
Securidaca longepedunculata, Wrightia natalensis and Rhoicissus tridentata extracts (chloroform and ethanol) stimulated dose-dependent relaxation (Table 1) in the corpus cavenosum smooth muscle at concentrations of 13.0 and 6.5 mg/ml. The stimulation of relaxation was between 0 and 60 s after the application of the extracts. A Harvard isotonic transducer elicited relaxation of the strips of corpus cavenosum smooth muscle in a frequency-dependant manner and the relaxation was significantly more (13.0 mg/ml) when exposed to the Securidaca longepedunculata chloroform extract (P < 0.01; n = 3) than the other two species. At an extract concentration of 13.0 mg/ml the relaxation induced was significantly higher (P < 0.01) than that of the 3.2 × 10−5 mg/ml of Viagra (positive control), whilst the later induced relaxation was better than the plant extract at 6.5 mg/ml. It was also found that the 1.0% of DMSO (negative control) used to dissolve the extracts, acted against the activity of the extracts by being responsible for 20.0% of contraction. % Relaxation of pre-contracted rabbit corpus carvenosal smooth muscle in the presence of herbal extracts Plant species
Average % relaxation (±S.D.)
Chloroform extracts
Ethanol extracts
13.0 mg/ml 6.5 mg/ml 13.0 mg/ml 6.5 mg/ml
Securidaca longepedunculata 66.7 ± 12.8a 16.7 ± 4.7 55.0 ± 7.1a Viagra relaxed muscles 21.0% at 3.2 × 10−5 mg/ml and DMSO contracted of the muscles 20.0% at a 1.0% concentration. a Significant difference when compared to Viagra at P < 0.01. 3.2. Effect of extracts on sperm parameters
The influence of 1.0, 2.5, 5.5 and 10 mg/ml extract of Securidaca longepedunculata on sperm motility is illustrated in Table 2. The extracts did not affect the sperm's progressive motility at the concentration of 1.0 mg/ml. However, progressive motility noticeably decreased after 4 h at 2.5 mg/ml and directly after addition (0 h) of the extracts at 6.5 and 10.0 mg/ml. Sperm was immotile (non-progressive) and/or moving in random directions. Motility was severely affected after 24 h incubation at 2.5 mg/ml and after 4 h incubation at both 6.5 and 10 mg/ml (P < 0.05). Influence of Securidaca longepedunculata extracts (% of control) on the progressive motility of human spermatozoa (±S.D.) Concentration of extract (mg/ml) Incubation period
87.7 ± 2.0 80.9 ± 3.0 73.9 ± 3.6 64.0 ± 5.4 82.2 ± 6.6 64.6 ± 4.0 40.0 ± 2.9a 5.1 ± 1.0a 90.8 ± 3.1 86.4 ± 2.0 77.9 ± 3.0 70.0 ± 4.0 a Significant difference when compared to control samples at P < 0.05. A similar pattern was noted when sperm vitality was tested using eosin–nigrosin after 24 and 48 h of incubation (Table 3). The supravital stain indicates the physical intactness of the sperm membrane and will only stain the sperm if it's membranes are not intact. The percentage viable spermatozoa should be the same or greater than the percentage motile spermatozoa. Approximately 50% of spermatozoa showed outer sperm membrane damage after 24 and 48 h of incubation while only 36.0% of spermatozoa stained negatively (intact membranes) at 1.0 mg/ml. When the extract's concentration was increased to 2.5, 6.5 and 10 mg/ml, nearly all of the spermatozoa were non-viable. Sperm vitality (%) assessment using eosin–nigrosin after 24 and 48 h of exposure to different concentrations of Securidaca longepedunculata extracts Concentration of extract (mg/ml) Vitality (%) of sperm ± S.D.
a Significant difference when compared to control samples at P < 0.05. The HOS test, which indicates the sperm membrane's functional integrity through the membrane's reactive response to a hypo-osmotic milieu, also showed a progressive negative response with increased herbal extracts (Table 4). Addition of 1.0 mg/ml herbal extract had no effect on sperm membrane integrity (P < 0.05). Sperm membrane integrity (%) assessment using the HOS test after 24 and 48 h of exposure to different concentrations of Securidaca longepedunculata extracts Concentration of extract (mg/ml) % Membrane integrity
Standard deviations are given in brackets. a Significant difference when compared to control samples at P < 0.05. The osmolarity of the media supplemented with the plant extracts were 290 mOsmol/kg (1.0 mg/ml of extract); 321 mOsmol/kg (6.5 mg/ml) and 350 mOsmol/kg (13.0 mg/ml), with a pH of 6.5 ± 0.4. The media supplemented with the plant extracts were similarly incubated at 37 °C, under 6.0% CO2, 95% humidity in air, prior to use. Sperm motility in media with osmolarities ranging from 293 to 440 mOsmol/kg was compared to that of sperm processed in the standard control media (283 mOsmol/kg). No significant difference (P > 0.05) was noted between the progressive motility of the spermatozoa in relation to media osmolarity over time (Table 5). Influence of osmolarity on the progressive motility (% ± S.D.) of spermatozoa over 48 h Osmolarity of media (mOsmol/kg) Incubation period
75.7 ± 2.6 74.1 ± 3.2 60.7 ± 3.5 35.3 ± 3.4 75.7 ± 5.0 73.0 ± 3.6 61.6 ± 5.0 36.7 ± 4.5 75.5 ± 3.5 74.2 ± 3.2 57.2 ± 3.8 30.5 ± 4.3 72.5 ± 4.5 71.2 ± 3.1 53.2 ± 4.1 32.6 ± 6.1 77.6 ± 3.1 76.1 ± 3.7 64.2 ± 5.0 39.9 ± 3.2 4. Discussion
“The erect penis has always been a symbol of power, virility and fertility” (Guirguis, 1998). Inability to obtain or sustain an erection of the penis sufficient to permit satisfactory intercourse is clinically known as erectile dysfunction (Singer, 1994, Guirguis, 1998, Manecke and Mulhall, 1999 and Jequier, 2000) or sometimes referred to as primary or secondary impotence (Singer, 1994). Erectile dysfunction is known to be a major health problem and can cause considerable distress, unhappiness and relationship problems (Guirguis, 1998 and Morgentaler, 1999). The treatment of erectile dysfunction, however, can be many faceted and may involve more than one regimen (Jequier, 2000). In response to modern, sophisticated, chemical medication, there has been a renewed interest in medicinal plants in the treatment of sexual dysfunction, which are being shown to be both effective and safe (Adimoelja, 2000). Several medicinal plants have always been available and used to treat many ailments including impotence. Very few scientific studies have been conducted on herbal plants, which are used in the treatment of infertility and impotence, compared to that of sexually transmitted diseases. Ginseng has been used in the treatment of erectile dysfunction for thousands of years in China and is now used in many Western countries. Other herbal remedies for treating erectile dysfunction include: crushed seeds of fennel, licorice, pollen, sarsaparilla, asafetida, hops and Spanish fly (Guirguis, 1998). In a study by Kim et al. (1998) relaxation of the smooth muscle, which is associated with erection, was observed after the application of 0.5–8.0 mg/ml of Panax ginseng extracts on rabbit corpus cavernosum smooth muscle. Similar results were obtained in the present study. It is therefore postulated that these extracts can facilitate the flow of blood into the penis. Erection cannot take place if the corpus carvenosum smooth muscle is contracted. The contraction of the corpus carvenosum smooth muscle is mediated by both translocations of calcium from extracellular sources and the release from intracellular sites especially the sarcoplasmic reticulum (Levin et al., 1997). Although there is a strong relationship between relaxation of the corpus carvenosum smooth muscle and sexual function (Keaton and Clark, 1997), it is also well known that there are many other factors that contribute to the deterioration of sexual function (Colabro et al., 1996). The in vitro bioassays of this study indicated that Securidaca longepedunculata (Polygalaeae), Wrightia natalensis (Apocynaceae) and Rhoicissus tridentata (Vitaceae) are promising “future candidates” for the treatment of erectile dysfunction. These plants are used traditionally by the Vhavenda to care for many ailments including the treatment of erectile dysfunction. Root bark powder and portions are usually mixed with Mabundu (a traditional drink from water and different grains) and water, respectively, and the mixture is consumed immediately or within two days. Though, all these herbal extracts showed in vitro activity when tested on rabbit smooth muscle, Securidaca longepedunculata was the most active. This extract relaxed the smooth muscle effectively at a concentration of 13 mg/ml which seems high when compared to Viagra. However, when the activity of a purified compound from this species, 1,7-dimethoxy-2-hydroxyxanthone, was tested in a previous study, it relaxed the smooth muscle at the low concentration of 1.8 × 10−5 mg/ml (Rakuambo et al., 2004). Herbal extracts from the root bark of Securidaca longepedunculata was further tested on human sperm parameters. Fertilization is primarily dependent on sperm motility and membrane integrity (Zheng and Zheng, 1996). The present study demonstrated an inhibitory effect of semi-purified herbal extracts (>1.0 mg/ml) from the root bark of Securidaca longepedunculata on sperm motility, vitality and membrane integrity. The results on sperm motility are comparable to the study conducted by Ondrizek et al. (1999) where Hypericum perforatum extracts (0.6 mg/ml) inhibited the sperm motility. Although the mechanism involved in the inhibition of sperm motility is unknown, it is clear that with no or poor sperm motility, vitality and membrane integrity, fertilization will be impaired. Results indicated that the inhibitory effect was caused by compounds in the extracts rather than the pH or the osmolarity of the media supplemented with herbal extracts. The results obtained here were in vitro and suggests that the low concentration might not affect the sperm in vivo. It is also possible that the compound or compounds in the plant extracts, responsible for relaxing rabbit corpus cavernosal smooth muscle tissue, might not affect the sperm cell as the extracts contain many different compounds. The possible association between contraceptive properties of Securidaca longepedunculata (Palgrave, 1977) and effects on sperm parameters, observed during the present study, warrants opportunities for future investigation. These preliminary results can be seen as the groundwork for further studies on isolation and identification of compounds and their mechanism of action. According to Drewes et al. (2002) the search is still on for a natural product that can deal successfully with erectile dysfunction. The present study highlighted the potential of South Africa's extraordinary plant-life and profound knowledge of traditional medicine, which can possibly be harvested for the treatment of sexual impotency. References
Adimoelja, 2000 A. Adimoelja, Phytochemicals and the breakthrough of traditional herbs
in the management of sexual dysfunction, International Journal of Andrology 23 (2000),
pp. 82–84.
Colabro et al., 1996 A. Colabro, G. Italiano, E.S. Pescatori, A. Marin, O. Gaetano, G.
Abatangelo, G. Abatangelo and F. Pagano, Physiological aging and penile erectile
function: a study in the rat, European Urology 29 (1996), pp. 240–244.
Drewes et al., 2002 S.E. Drewes, M.M. Horn, O.Q. Munro, J.T.B. Dhlamini, J.J.M.
Meyer and N.C. Rakuambo, Pyrano-isoflavones with erectile-dysfunction activity from
Eriosema kraussianum, Phytochemistry 59 (2002), pp. 739–747.
Galeffi et al., 1990 G. Galeffi, E. Federici, J.D. Msonthi, G.B. Marini-Bettolo and M.
Nicoletti, New xanthones from Ectiadiopsis oblongifolia and Securidaca
longipendunculata, Fitoterapia LXI (1990), pp. 79–81.
Guirguis, 1998 W.R. Guirguis, Oral treatment of erectile dysfunction: from herbal
remedies to designer drugs, Journal of Sex and Marital Therapy 24 (1998), pp. 69–73.
Jequier, 2000 A.M. Jequier, Male Infertility: A Guide for the Clinician, Blackwell Science Ltd. (2000) pp. 200–225. Keaton and Clark, 1997 A.K. Keaton and J.T. Clark, Effects of angiotensin 11 on sexual
function, blood pressure, and fluid intake are differentially affected by AT-1 receptor
blockade, Physiology and Behavior 64 (1997), pp. 339–346.
Kim et al., 1998 H.J. Kim, D.S. Woo, G. Lee and J.J. Kim, The relaxation effects of
ginseng saponin in rabbit corporal smooth muscle: is it a nitric oxide donor?, British
Journal of Urology 82 (1998), pp. 744–748.
Levin et al., 1997 R.M. Levin, J.A. Hypolite, G. Broderik and A. Broderik, Evidence for
a role of intracellular-calcium release in nitric oxide-stimulated relaxation of the rabbit
corpus cavenorsum, Journal of Andrology 3 (1997), pp. 246–249.
Mabogo, 1990 Mabogo, D.E.N., 1990. The ethnobotany of Vhavenda. M.Sc. thesis, University of Pretoria, Pretoria. Manecke and Mulhall, 1999 R.G. Manecke and J.P. Mulhall, Medical treatment of
erectile dysfunction, Annals of Medicine 31 (1999), pp. 388–398.
Morgentaler, 1999 A. Morgentaler, Male impotence, Lancet 354 (1999), pp. 1713–1718.
Ondrizek et al., 1999 R.R. Ondrizek, P.J. Chan, W.C. Patton and A. King, Inhibition of
human sperm motility by specific herbs used in alternative medicine, Journal of Assisted
Reproduction and Genetics 16 (1999), pp. 87–91.
Palgrave, 1977 K.C. Palgrave, Trees of Southern Africa, Struik Publishers (Pty) Ltd., Cape Town (1977) pp. 388–389. Rakuambo et al., 2004 N.C. Rakuambo, J.J.M. Meyer and A. Hussein, Xanthone isolated
from Securidaca longepenunculata with activity against erectile dysfunction, Fitoterapia
75 (2004), pp. 497–499.
Singer, 1994 C. Singer, Erectile and ejaculatory disturbances: overview of diagnosis and treatment. In: C. Singerand and W.J. Weiner, Editors, Sexual Dysfunction, Futura publishing Company Inc., New York (1994), pp. 45–59. WHO, 1999 World Health Organization, 1999. WHO laboratory manual for the examination of human semen and sperm-cervical mucus interaction, Cambridge University Press, pp. 6–29. Zheng and Zheng, 1996 R-L. Zheng and H. Zheng, Effects of ferulic acid on fertile and
asthenozoospermic infertile human sperm motility, viability, lipid peroxidation, and
cyclic nucleotides, Free Radical Biology & Medicine 22 (1996), pp. 581–586.

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