Long-term feeding effects of Catha edulis leaves on blood constituents in animals

In this study, the long-term (6 months) biochemical effects of varying levels of Catha edulis leaves on the plasma concentration of glucose, triglycerides, cholesterol, HDL-cholesterol, total protein, albumin, uric acid, urea and creatinine were examined. Our results demonstrated a significant decrease in plasma cholesterol throughout the treatment period by all levels of C. edulis leaves tested. This significant decrease in plasma cholesterol was halved at the end of the treatment period and corresponded with a significant increase in plasma HDL-cholesterol and a significant decrease in plasma glucose and triglycerides concentrations. Moreover, C. edulis treatment increased plasma uric acid significantly, in a time-dependent manner with the higher concentrations (20% and 30%) of C. edulis leaves. Only plasma albumin was decreased significantly at the end of the treatment period, with no significant effect on plasma total protein. This also coincided with a significant, dose-dependent decrease in plasma urea at month 6, with no significant effect on plasma creatinine concentration.     

A randomized, double-blind, placebo-controlled, clinical dose–response trial of an extract of Baptisia, Echinacea and Thuja for the treatment of patients with common cold

The aim of this study was to verify the efficacy and safety of an herbal medication containing an extract of a mixture of Baptisiae tinctoriae radix, Echinaceae pallidae/purpureae radix and Thujae occidentalis herba (SB-TOX) in the treatment of upper respiratory tract infections (URIs), and to test whether SB-TOX's clinical efficacy is dose dependent. A total of 91 adults (mean age 42.1±13.0 years) were randomised to receive 19.2 mg of SB-TOX (n=31), 9.6 mg SB-TOX (n=29) or placebo (n=31) three times daily for 3–12 days. Since a “running nose” is the main symptom of a common cold, the total number of facial tissues used throughout the clinical duration of their cold was the primary efficacy parameter. In the intention-to-treat analysis, this total number of tissues decreased with increasing extract dose. The slope across groups according to the Jonckheere test was significant (p=0.0259). In the high-dose group, the standardised effect size Δ/SD was 0.46 compared with placebo. Time to relevant improvement in cold symptoms (measured as the time until less than 30 tissues per day were used) was 1.1 days (95% CI 0.52; 1.67), 0.76 days (95% CI 0.28; 1.24) and 0.52 days (95% CI 0.22; 0.82) in the placebo, low-dose and high-dose groups, respectively (p_LogRank=0.0175). No adverse events were reported. This study demonstrates the efficacy and safety of SB-TOX in the treatment of URIs, and that its efficacy is dose dependent.     

Dispersal, landscape occupancy and population structure in the butterfly Melanargia galathea

Dispersal is a key ecological process linking metapopulation dynamics in the landscape to distribution patterns at larger spatial scales. In this study, we investigated the landscape occupancy and genetic population structure of a butterfly species, Melanargia galathea. Several landscapes differing in composition and structure were sampled as well as populations at different spatial scales. We found that M. galathea occupied 91.3% of all habitat patches available within a particular landscape, probably due to a dominance of landscape scale processes such as rescue effect and recolonisation. A high level of genetic polymorphism within the sampled populations and a very low amount of genetic differentiation between populations was observed (G_st=0.034), characteristic of species with high dispersal capacity and/or high density. High dispersal rates ensured considerable gene mixing at the landscape scale while the influence of distance on dispersal success was detected at the regional and continental scales by a significant amount of isolation by distance. We also found that, at the landscape scale, the dispersal of this butterfly species was influenced by the spatial distribution of its habitat patches.

Zusammenfassung

Die Ausbreitung ist ein ökologischer Schlüsselprozess, der die Metapopulationsdynamik in einer Landschaft mit den Verbreitungsmustern auf einer größeren räumlichen Skala verbindet. In dieser Studie untersuchten wir die Verbreitungsmuster und die genetische Populationsstruktur einer Schmetterlingsart, Melanargia galathea. Es wurden sowohl einige Landschaften beprobt, die sich in der Zusammensetzung und der Struktur unterschieden, als auch Populationen auf verschiedenen räumlichen Skalen. Wir fanden, dass M. galathea 91.3% aller verfügbaren Habitatflecken in einer bestimmten Landschaft besetzte, möglicherweise aufgrund der Dominanz von Landschaftsskalenprozessen wie “Rescue-Effekt” und Rekolonisation. Es wurde ein hoher genetischer Polymorphismuslevel und ein sehr geringer Umfang genetischer Differenzierung innerhalb der beprobten Populationen beobachtet (G_st=0.034), was charakteristisch für Arten mit einer großen Ausbreitungsfähigkeit und/oder hoher Dichte ist. Hohe Ausbreitungsraten sicherten eine beträchtliche Genvermischung auf der Landschaftsskala, während der Einfluss der Entfernung auf den Verbreitungserfolg auf der regionalen und kontinentalen Skala durch einen signifikanten Anteil der Isolation aufgrund von Entfernung festgestellt wurde. Wir fanden auch, dass auf der Landschaftsskala die Ausbreitung dieses Schmetterlings durch die räumliche Verteilung der Habitatflecken beeinflusst wurde.     

Triterpenoid cynarasaponins from Cynara cardunculus L. reduce chemically induced mutagenesis in vitro

Saponins, steroid or triterpene glycosides, are known to have a broad spectrum of biological and pharmacological activities. Three different triterpenoid saponins, marked here as 1s, 2s and 3s, from involucral bracts of Cynara cardunculus L. were isolated and their antimutagenic effect was assessed. Using spectrophotometric method it was shown that all three substances, 1s, 2s and 3s, possess very good absorptive capability. The antimutagenic effect of these substances was estimated against acridine orange (AO)- and ofloxacin-induced damage of chloroplast DNA in Euglena gracilis assay. These cynarasaponins were experimentally confirmed to exhibit different, statistically significant activity in reducing damage of chloroplast DNA of the flagellate E. gracilis induced by AO and ofloxacin (p_t<0.05–0.01). Our findings suggest that the antimutagenic effect of 1s, 2s and 3s against AO-induced chloroplast DNA impairment could be a result of their absorptive capacity. As far as ofloxacin is concerned, a possible mechanism of the reduction of the chloroplast DNA lesion was not elucidated so far. To our knowledge, these data demonstrate for the first time the antimutagnic activity of saponins isolated from involucral bracts of C. cardunculus exerted through different mode of action.     

Chemomodulatory effects of Terminalia chebula against nickel chloride induced oxidative stress and tumor promotion response in male Wistar rats

Nickel, a major environmental pollutant is a known potent nephrotoxic agent. In this communication we report the chemopreventive effect of Terminalia chebula on nickel chloride (NiCl₂) induced renal oxidative stress, toxicity and cell proliferation response in male Wistar rats. Administration of NiCl₂ (250 μmoL Ni/kg body weight) to male Wistar rats resulted in an increase in the reduced renal glutathione content (GSH), glutathione-S-transferase (GST), glutathione reductase (GR), lipid peroxidation (LPO), H₂O₂ generation, blood urea nitrogen (BUN) and serum creatinine with a concomitant decrease in the activity of glutathione peroxidase (p<0.001). Nickel chloride (NiCl₂) treatment also induced tumor promotion markers, viz., ornithine decarboxylase (ODC) activity and thymidine [³H] incorporation into renal DNA (p<0.001). Prophylactic treatment of rats with T. chebula (25 mg/kg body weight and 50 mg/kg body weight) daily for one week resulted in the diminution of NiCl₂ mediated damage as evident from the down regulation of glutathione content, GST, GR, LPO, H₂O₂ generation, BUN, serum creatinine, DNA synthesis (p<0.001) and ODC activity (p<0.01) with concomitant restoration of GPx activity. Thus, the present investigation suggests that T. chebula extract could be used as therapeutic agent for cancer prevention as evident from this study where it blocks or suppresses the events associated with chemical carcinogenesis.     

Effects of temperature on tilt evoked swimming in the crabs Carcinus and Macropipus

1. 1.|Integrated muscle activity, total number of limb beats and the maximum instantaneous limb beat frequency were measured in crabs during a standardized tilt regime at a series of different water temperatures between 10 and 25°C.

2. 2.|Total integrated activity and total number of limb beats showed a general increase for a decrease in temperature in all groups. Frequency of limb beat was always higher for Macropipus depurator than for Carcinus maenas, with M. depurator showing an increase and C. maenas a decrease in frequencies at extreme temperatures.

3. 3.|The temperature of acclimation of C. maenas affected the response of the crab in all parameters studied while all the results can be related to the size and normal environmental temperature range of the two species studied.

超声波对铜绿微囊藻与蛋白核小球藻生理特征及竞争生长的影响

铜绿微囊藻是常见的水华蓝藻,常常在湖泊中与蛋白核小球藻共存或竞争生长。超声波可用于藻华即时治理,能够降低藻类生理活性,影响藻类生长,还可能改变藻类种间竞争关系。为了探究超声胁迫(35 kHz,0.035 W·cm^-3)对铜绿微囊藻与蛋白核小球藻的生理特征及种间竞争的影响,本研究设置纯藻组和1:1混合组(细胞浓度比)进行试验。结果表明: 铜绿微囊藻对超声胁迫更加敏感。超声处理600 s后,铜绿微囊藻的光合活性(F_v/F_m)和酯酶活性存在显著变化,纯藻组和混合组的F_v/F_m分别降低了51.8%和64.7%。而各组中蛋白核小球藻的光合活性变化较小。同时,铜绿微囊藻释放的荧光溶解性有机物(类色氨酸、类酪氨酸、类富里酸物质)含量多于蛋白核小球藻。两种藻的细胞浓度对超声波的响应也不同,蛋白核小球藻变化较小,而铜绿微囊藻的细胞浓度出现不同程度的下降。尤其是600 s超声处理大幅降低了混合组中铜绿微囊藻的细胞浓度(-42.6%),在超声胁迫解除后的8 d内蛋白核小球藻占优势,种间关系由铜绿微囊藻单边抑制蛋白核小球藻转变为两者互相抑制。在超声处理后,铜绿微囊藻的活性能够逐渐恢复,为了提高控藻效果的持久性,建议在一周后再次进行超声处理。     

凋落叶多样性对杉木幼苗生长及吸收15N标记硫铵的影响

利用¹⁵N硫铵研究了凋落叶多样性对杉木幼苗生长及养分吸收的影响.结果表明,凋落叶多样性的增加有利于盆栽杉木幼苗的生长.杉木、火力楠、红栲和刺楸4种凋落叶混合处理后,杉木幼苗的生长量最大;杉木、火力楠、刺楸3种凋落叶混合处理后的杉木幼苗生长量次之,其它依次为杉木、火力楠、红栲3种凋落叶混合处理>杉木和刺楸凋落叶处理>杉木和红栲凋落叶处理>对照>杉木和火力楠2种凋落叶混合处理>杉木凋落叶处理.就杉木幼苗对硫铵氮的吸收率而言,不作任何处理的杉木幼苗吸收率最高,其次为杉木、火力楠、红栲和刺楸4种凋落叶混合处理,其它依次为杉木、火力楠、刺楸3种凋落叶混合处理和杉木、火力楠、红栲3种凋落叶混合处理>杉木和刺楸凋落叶处理>杉木和红栲凋落叶处理>杉木和火力楠2种凋落叶混合处理>杉木凋落叶处理.另外,用凋落叶处理后,土壤中硫铵氮的残留量比不作凋落叶处理的土壤多,硫铵氮的总回收量也比不作凋落叶处理的土壤大幅增加,而且凋落叶多样性的增加也会增加硫铵氮的残留量.     

Mattesia oryzaephili (Neogregarinorida: Lipotrophidae), a Pathogen of Stored-Grain Insects: Virulence, Host Range and Comparison with Mattesia dispora

The neogregarine, Mattesia oryzaephili (Neogregarinorida: Lipotrophidae) has only been reported from the sawtoothed grain beetle, Oryzaephilus surinamensis. The pathogen's presence in cadavers of the rusty grain beetle, Cryptolestes ferrugineus, in collapsed colonies prompted studies of its potential to control stored-product insects. Respective mortality rates in fourth instar C. ferrugineus and C. pusillus were 15.3 and 17.7% at 10² oocysts/g of diet and 89.4 and 80.5% at 10⁵ oocysts/g. The mortality of fourth instar O. surinamensis exposed to 10⁵ oocysts/g was only 12%. For C. ferrugineus larvae, there were no significant differences in mortality and infection between exposure to Mattesia dispora and exposure to M. oryzaephili (P>0.05), but for C. pusillus larvae, both responses were significantly higher for M. oryzaephili than M. dispora. Adult C. ferrugineus and O. surinamensis were similar in their responses to M. oryzaephili, with mortality not exceeding 20%, but differed in their responses to M. dispora, with O. surinamensis being more susceptible. The median lethal doses for larval Mediterranean flour moths, Ephestia kuehniella, were 7.9×10⁷M. oryzaephili oocysts/g of diet and 2.7×10³M. dispora oocysts/g of diet. In single dose assays of M. oryzaephili physiological host range, greater than 75% infection was achieved for Rhyzopertha dominica and Plodia interpunctella. More than half of oocysts germinated during passage through the guts of susceptible and resistant insects. Second and third instar Galleria mellonella were highly susceptible to M. oryzaephili infection, but fifth instars were not. Infection percentages in fifth instars exposed to 10⁶ oocysts/g were significant only when boric acid or the stilbene, Blankophor®RHK were incorporated into the diet. Host range and general morphology confirm the identity of Mattesia oryzaephili.     

Atorvastatin, a potent HMG-CoA reductase inhibitor, is not antipyretic in rats

1. We investigated whether atorvastatin, a plasma cholesterol lowering and anti-inflammatory drug, attenuates lipopolysaccharide-induced fever in rats.

2. Sprague–Dawley rats, implanted with abdominal temperature-sensitive telemeters, were administered either lipopolysaccharide and placebo (n=7), lipopolysaccharide and atorvastatin (n=6), saline and placebo (n=8), or saline and atorvastatin (n=7).

3. Atorvastatin (100 mg kg⁻¹) was administered orally, as a suspension in a flavoured gelatine cube (placebo cubes contained no drug), 90 min before intraperitoneal injection of pyrogen (Salmonella typhosa lipopolysaccharide, 75 μg kg⁻¹) or sterile saline.

4. Atorvastatin did not disrupt normal thermoregulation. Atorvastatin also did not attenuate lipopolysaccharide-induced changes in body temperature and cage activity.

Spatial fiber type distribution in normal human muscle: Histochemical and tensiomyographical evaluation

The variability of fiber type distribution in nine limb muscles was examined with histochemical and tensiomyographical (TMG) methods in two groups of 15 men aged between 17 and 40 years. The aim of this study was to determine the extent to which the relative occurrence of different fiber types and subtypes varies within human limb muscles in function to depth and to predict fiber type proportions with a non-invasive TMG method.

The distribution of different fiber types varied within the muscles, as a function of depth, with a predominance of type 2b fibers at the surface and type 1 fibers in deeper regions of the muscle. For all the analyzed muscles the contraction times measured at stimulus intensity 10% of supramaximal stimulus (10% MS) were significantly (p<0.05) shorter than the contraction times measured at 50% of supramaximal stimulus intensity (50% MS). The Pearson's correlation coefficient between percentage of type 1 muscle fibers measured at the surface of the muscle and contraction time at 10% MS, obtained by TMG was statistically significant (r=0.76,P<0.01). Also the Pearson's correlation coefficient between percentage of type 1 muscle fibers measured in the deep region of the muscle and contraction time at 50% MS obtained by TMG was also statistically significant (r=0.90,P<0.001).

These findings suggest that the contraction time obtained by TMG may be useful for non-invasive examining of muscle fiber types spatial distribution in humans.     

Molybdenum balance in healthy young Japanese women

The absorption and balance of molybdenum (Mo) were examined in 43 healthy young Japanese women in four metabolic studies performed once a year from 2001 to 2004. In each year, an 18-d metabolic study, including two successive balance study sessions of 4 d, was designed and four kinds of dietary menus were supplied to the subjects periodically. Since the protein sources of the menus were specified in 2001–2003, and soybean products were poor in 2001 and 2002 and rich in the 2003, Mo intake in 2001 and 2002 was about 150 μg/d while that in 2003 reached 318 μg/d. In 2004, the protein sources were not specified and Mo intake was 217 μg/d. This range of Mo intake overlapped that in the Japanese population. When the results of the four studies were pooled, Mo balance was calculated as 0.09±0.37 μg/d/kg (mean±SD), and no significant relationship (r=0.142) was observed between the intake and balance. Between the apparent absorption (Y) and the intake (X), a significant (r=0.988, p<0.001) positive linear regression (Y=0.927X-0.523) was observed. Similarly, a significant (r=0.960, p<0.001) positive linear regression was observed between Mo intake and urinary excretion. These results indicate that more than 90% of Mo contained in a routine dietary menu is absorbed, most of Mo absorbed is excreted in urine, and Mo balance is in equilibrium in the general Japanese population.     

Efficacy of a Comfrey root extract ointment in comparison to a Diclo-fenac gel in the treatment of ankle distortions: Results of an observer-blind, randomized, multicenter study

In the treatment of minor blunt injuries several topical drugs are known to have anti-inflammatory and analgesic properties. They represent, however, two fundamentally different major pharmacological therapy approaches: the “chemical-synthetical” and the “phytotherapeutical” approach. The main objective of this trial (CODEC_2004) was to compare the efficacy and tolerability of an ointment of Comfrey extract (Extr. Rad. Symphyti) with that of a Diclofenac gel in the treatment of acute unilateral ankle sprain (distortion). In a single-blind, controlled, randomized, parallel-group, multicenter and confirmatory clinical trial outpatients with acute unilateral ankle sprains (n=164, mean age 29.0 years, 47.6% female) received either a 6 cm long ointment layer of Kytta-Salbe^® f (Comfrey extract) (n=82) or of Diclofenac gel containing 1.16 g of diclofenac diethylamine salt (n=82) for 7±1 days, four times a day.

Primary variable was the area-under-the-curve (AUC) of the pain reaction to pressure on the injured area measured by a calibrated caliper (tonometer). Secondary variables were the circumference of the joint (swelling, figure-of-eight method), the individual spontaneous pain sensation at rest and at movement according to a Visual Analogue Scale (VAS), the judgment of impaired movements of the injured joint by the method of “neutral-zero”, consumption of rescue medication (paracetamol), as well as the global efficacy evaluation and the global assessment of tolerability (both by physician and patient, 4 ranks). In this study the primary variable was also to be validated prospectively.

It was confirmatorily shown that Comfrey extract is non-inferior to diclofenac. The 95% confidence interval for the AUC (Comfrey extract minus Diclofenac gel) was 19.01–103.09 h*N/cm² and was completely above the margin of non-inferiority. Moreover, the results of the primary and secondary variables indicate that Comfrey extract may be superior to Diclofenac gel.     

Structure of an otter (Lutra lutra) population in Germany – results of DNA and hormone analyses from faecal samples

Population size, one of the basic biological parameters is particularly difficult to estimate for nocturnal animals with cryptic life style and little individual distinctiveness like Eurasian otters (Lutra lutra). Because telemetric methods often fail and also expose the animals to a high risk of injuries and even mortality, we analysed DNA and hormones of spraints to obtain data on population density and structure of free-living otters in a Nature Park in north-eastern Germany. We were able to assign 53 different individual profiles from faecal samples and obtained six more profiles from animals found dead inside the park. The total population estimate (n=59) consisted of at least 32 males and 27 females; 33 animals were adult, 23 younger than 2 years (three of unknown age). Marking points were frequented by up to 12 individuals. Estimated density was one animal per 4.7 km of shoreline. The genotypically estimated total population size was more than 2.5 times as high as estimated in the past census. The method was also suited to compare otter population densities in different areas or at different times in the same area.     

风车草和香根草在人工湿地中迁移养分能力的比较研究

为研究风车草(Cyperus alternifolius)和香根草(Vetiveria zizanioides)迁移养分的能力,建立17.0m²风车草潜流式人工湿地和13.3 m²香根草潜流式人工湿地处理猪场废水,在四个季节末测定植物生物量和组织氮、磷、铜、锌含量.结果表明,香根草地下部生物量大于风车草,地上部生物量则是风车草大于香根草.风车草年地上部收获量为3406.47 g·m^-2,比香根草的1483.88 g·m^-2高2.3倍;风车草的氮含量为22.69 mg·g^-1,比香根草的15.44 mg·g^-1高7.25 mg·g^-1;风车草的磷含量为6.09 mg·g^-1,比香根草的5.47 mg·g^-1高0.62 mg·g^-1.植株含铜、锌量风车草略比香根草高.风车草每年迁移N 68.72 g·m^-2和P18.49 g·m^-2,香根草迁移N 8.93 g·m^-2和P 3.69 g·m^-2.风车草人工湿地每年由植物迁移的氮、磷、铜、锌比香根草高4～7倍.     

亚热带米老排和杉木细根分解过程中养分与微生物群落组成的变化

对福建南平峡阳林场19年生米老排和杉木人工林的细根进行为期12个月的分解试验,研究不同树种分解过程中养分和微生物群落组成的动态变化,为理解亚热带不同人工林树种地下养分循环过程提供科学依据.结果表明: 米老排细根养分磷(P)、钾(K)初始含量显著高于杉木.分解过程中,两个树种细根P、K含量均显著降低,而细根氮(N)含量显著增加,且杉木细根N含量变化滞后于米老排.在分解过程中,杉木细根镁(Mg)含量无显著变化;米老排细根Mg含量变化显著,且在分解8个月时显著小于杉木.在分解过程中,真菌与细菌比值均显著表现为先升高后降低,且分解12个月时米老排细根真菌/细菌显著高于杉木.冗余分析表明,N(解释37.2%)、K(解释14.5%)含量和C/N(解释14.8%)是影响杉木细根分解过程中微生物群落组成变化的主要养分因子,而Mg(解释35.9%)和K(解释17.6%)含量则是米老排细根分解时影响微生物群落组成的主要养分因子.研究表明,在不同树种中,除了N之外,Mg等其他养分元素也可能是影响根系分解的重要因子.     

Ideal phenotypes and mismatching haplotypes – errors of mtDNA treeing in ants (Hymenoptera: Formicidae) detected by standardized morphometry

A total of 401 nest samples of Formica lugubris Zetterstedt, F. pratensis Retzius, F. aquilonia Yarrow, F. rufa Linnaeus, and F. polyctena Förster, covering the entire Palaearctic range of these species and including 2100 individual workers, was phenotypically investigated by a system of standardized morphometry, pairwise removal of allometric variance, and canonical discriminant functions. A mitochondrial DNA fragment including the cytochrome b gene was sequenced in 148 samples from basically the same range. In the more difficult F. pratensis vs. F. lugubris case, the phenotypic system correctly determined 99.6% of all nest samples, and 95.1% with p<0.05. In all other pairwise species discriminations any nest sample was correctly determined with p<0.01, and three samples with hybrids F. rufa×lugubris were identified. At four localities in the Pyrenees and the Urals, 9 samples with F. pratensis phenotypes (7 of them ideal) but F. lugubris mtDNA haplotypes could be identified, resulting in 14.5% of phenotype/haplotype mismatches. A local dominance of this mismatch combination was observed at one Pyrenean and one Ural locality. There was no indication of an F. pratensis haplotype associated with an F. lugubris phenotype. One ideal F. polyctena phenotype was associated with an F. aquilonia haplotype in a sample from the Urals, and one ideal F. aquilonia phenotype was combined with an F. lugubris haplotype in a sample from central Siberia, resulting in overall phenotype/haplotype mismatch frequencies of 12.5% and 11.1%, respectively. We conclude that all these samples cannot represent actual F₁ hybrids but are the result of hybridizations in the past followed by unidirectional purging of the nuclear genome. Whether this process of purging worked very fast or over longer periods of population history, and whether or not it was complete or incomplete, cannot be assessed from the available information. These facts of hybridizing in two thirds of the W Palaearctic wood ant species, of extreme regional hybrid frequencies (up to 26%), of unidirectional purging of nDNA associated with mismatching mtDNA haplotypes, and of occasional achievement of local dominance of these mismatch combinations, may serve as urgent warning not to perform isolated mtDNA phylogenetic studies without a geographically and locally wide sampling basis and without control by nDNA information or reliable phenotypic determination. The latter two systems definitely have superior significance when conflicts with mtDNA indications arise.     

Metabolite and ionic composition of follicular fluid from different-sized follicles and their relationship to serum concentrations in dairy cows

Metabolic changes in blood serum may be reflected in the biochemical composition of follicular fluid and could indirectly influence oocyte quality. The purpose of this study was to examine the biochemical composition of follicular fluid harvested from different-sized follicles and its relationship with that of blood serum in dairy cattle. Following slaughter, blood samples were collected from dairy cows (n=30) and follicular fluid aspirated from three size classes of non-atretic follicles (<4 mm, 6–8 mm and >10 mm diameter). Samples remained independent between cows and between size classes within cows. Serum and follicular fluid samples were assayed using commercial clinical and photometric chemistry assays for ions (sodium, potassium and chloride) and metabolites (glucose, β-hydroxybutyrate (β-OHB), lactate, urea, total protein, triglycerides, non-esterified fatty acids (NEFA) and total cholesterol). Results showed that follicular fluid concentrations of glucose, β-OHB and total cholesterol increased from small to large follicles and decreased for potassium, chloride, lactate, urea and triglycerides. There was a significant concentration gradient for all variables between their levels in serum and follicular fluid (P<0.05). Significant correlations were observed for chloride (r=0.40), glucose (r=0.56), β-OHB (r=0.85), urea (r=0.95) and total protein (r=0.60) for all three follicle size classes and for triglycerides (r=0.43), NEFA (r=0.50) and total cholesterol (r=0.42) for large follicles (P<0.05). The results from the present study suggest that the oocyte and the granulosa cells of dairy cows grow and mature in a biochemical environment that changes from small to large follicles. Furthermore, the significant correlation between the composition of serum and follicular fluid for the above-mentioned metabolites suggests that metabolic changes in serum levels will be reflected in the follicular fluid and, therefore, may affect the quality of both the oocyte and the granulosa cells.     

七星瓢虫成虫对枸杞木虱的捕食作用

为了测定七星瓢虫成虫对枸杞木虱4种虫态的捕食作用,分别在室内测定七星瓢虫的捕食功能反应、种内干扰、自身密度干扰、捕食偏好性以及在田间七星瓢虫对枸杞木虱的捕食效果.结果表明: 七星瓢虫对枸杞木虱的捕食功能反应符合Holling Ⅱ型方程,其中对卵的最大捕食量为112.6粒,对1～2龄若虫、3～5龄若虫、成虫的最大捕食量分别为536、415和113.9头;田间罩笼试验结果证明,七星瓢虫成虫在其生长周期30 d内能使枸杞木虱总虫口密度下降80.1%;七星瓢虫对1～2龄枸杞木虱若虫的搜寻效率参数a=0.9451,处理时间参数T_h=0.001865,整体优于卵、3～5龄若虫与成虫,且在每皿100头的猎物密度下七星瓢虫的最大捕食率能达80.2%,益害比参考值为1∶100.七星瓢虫对枸杞木虱的捕食作用受自身密度的影响显著大于种内干扰.在混合猎物密度为每皿100头下,七星瓢虫更偏好木虱成虫,在密度为每皿300头下,七星瓢虫更偏向于木虱若虫.表明七星瓢虫是很有控制潜力的捕食性天敌,人工释放七星瓢虫成虫可有效取食枸杞木虱初孵若虫,降低木虱为害.