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1.
The effect of a synthetic curcumin analogue (salicylcurcumin) on fish lipid peroxidation was investigated in both in vitro
and in vivo conditions using a teleost model Anabas testudineus (Bloch). Curcumin analogue inhibited the formation of lipid peroxidation products and thiobarbituric acid reactive substances
(TBARS) content at the three concentrations (10−2 M, 10−3 M and 10−4 M) in vitro. TBARS content was reduced by 80% in the liver and 68% in brain by the higher concentration of salicylcurcumin.
For in vivo study, salicylcurcumin (0.5%) was supplemented along with the basal feed for a period of 60 days. It produced
a 60% reduction in liver TBARS content. The antioxidant enzyme superoxide dismutase (SOD) was stimulated, whereas catalase
(CAT) and glutathione peroxidase (GPx) were inhibited. Glutathione (GSH) was reduced and glutathione reductase (GR) unchanged.
Even though there was an increase in SOD activity, the CAT and GPx did not increase accordingly, maybe due to the direct scavenging
of H2O2 by salicylcurcumin. The protein content also increased in the curcumin-fed animals, indicating a positive growth-promoting
effect. Therefore, it would be beneficial to supplement salicylcurcumin along with the aquaculture feed in order to help the
fish to cope with adverse conditions in the environment. This would increase the survival rate, disease resistance and ultimately
the growth rate. 相似文献
2.
The spawning grounds of the chub mackerel (Scomber japonicus) and spotted mackerel (Scomber australasicus) in the East China Sea were estimated based on catch statistics of the Japanese large- and medium-type purse seine fishery
from 1992 to 2006. Biometric data were obtained from specimens caught by purse seiners in the East China Sea from 1998 to
2006. Gonadosomatic index (GSI) at 50% sexual maturity of chub mackerel and spotted mackerel females was 2.5 and 2.6, respectively.
Using this criterion for GSI, chub mackerel larger than 275 mm and spotted mackerel larger than 310 mm in fork length were
considered to be mature. Mature chub mackerel was observed in the area of 15–22°C sea surface temperature (SST), and mature
spotted mackerel was observed in the area of 17–25°C SST. The spawning period of chub mackerel ranged from February to June,
and that of spotted mackerel ranged from February to May in the East China Sea. The spawning grounds were estimated from the
distributions of catch per unit effort (CPUE) of spawners and SST. As a result, the spawning ground of chub mackerel was estimated
to be in the central and southern part of the East China Sea and the area west of Kyushu in February, March, and April, and
in the central part of the East China Sea, the area west of Kyushu and Tsushima Straight in May, and in Tsushima Straight
and western part of the Sea of Japan in June. The spawning ground of spotted mackerel was estimated to be in the central and
southern part of the East China Sea and southern coastal area of Kyushu in February, March, and April, and the central and
southern part of the East China Sea and the area west of Kyushu in May. 相似文献
3.
This study was conducted to evaluate the effects of dietary riboflavin on antioxidant defense in the juvenile grouper Epinephelus coioides. Graded levels of riboflavin (0.9, 1.6, 4.4, 6.7, 12.9 and 19.4 mg kg−1 dry diet) were fed to grouper juveniles (mean weight: 14.90 ± 0.46 g) for 12 weeks. Higher levels of liver thiobarbituric
acid reactive substances (TBARS) content were observed in grouper fed low doses (0.9 and 1.6 mg kg−1 diet) of riboflavin. Both liver glutathione reductase (GR) activity and its activation coefficient (GR-AC) poorly responded
to riboflavin deficiency. In addition, other indices of the glutathione-dependent defense system, including the activities
of glutathione peroxidase (GSH-PX) and glutathione-S-transferase (GST), and the content of glutathione (GSH), were also non-significantly
affected by dietary riboflavin levels. However, the activities of liver superoxide dismutase (SOD) and catalase (CAT) were
significantly lower in fish fed 0.9 mg kg−1 diet, with a positive correlation between the different groups. In conclusion, the present study indicated that the juvenile
grouper fed the riboflavin-unsupplemented diet was susceptible to lipid peroxidation (LPO), with lower SOD and CAT activities
in the liver. However, the glutathione-dependent defense system of grouper was not affected by dietary riboflavin levels. 相似文献
4.
The ontogenetic development of the digestive enzymes amylase, lipase, trypsin, and alkaline phosphatase and the effect of
starvation in miiuy croaker Miichthys miiuy larvae were studied. The activities of these enzymes were detected prior to exogenous feeding, but their developmental patterns
differed remarkably. Trypsin activity continuously increased from 2 days after hatching (dah), peaked on 20 dah, and decreased
to 25 dah at weaning. Alkaline phosphatase activity oscillated at low levels within a small range after the first feeding
on 3 dah. In contrast, amylase and lipase activities followed the general developmental pattern that has been characterized
in fish larvae, with a succession of increases or decreases. Amylase, lipase, and trypsin activities generally started to
increase or decrease at transitions from endogenous to exogenous feeding or diet changes, suggesting that these enzymatic
activities can be modulated by feeding modes. The activities of all the enzymes remained stable from 25 dah onwards, coinciding
with the formation of gastric glands and pyloric caecum. These results imply that specific activities of these enzymes underwent
changes due to morphological and physiological modifications or diet shift during larval development but that they became
stable after the development of the digestive organs and associated glands was fully completed and the organs/glands functioned.
Trypsin and alkaline phosphatase were more sensitive to starvation than amylase and lipase because delayed feeding up to 2 days
after mouth opening was able to adversely affect their activities. Enzyme activities did not significantly differ among feeding
groups during endogenous feeding; however, all activities were remarkably reduced when delayed feeding was within 3 days
after mouth opening. Initiation of larvae feeding should occur within 2 days after mouth opening so that good growth and survival
can be obtained in the culture. 相似文献
5.
E. Bombardier R. K. Booth H. J. Green R. S. McKinley 《Fish physiology and biochemistry》2010,36(3):355-365
The adaptability/plasticity of the highly oxidative red muscle in Atlantic salmon was demonstrated during spawning migration.
Substrate concentrations and the enzymatic pathways of ATP production were examined in red muscle obtained from Atlantic salmon
at different sites along their migratory route in the Exploits River, Newfoundland, Canada. Individuals were chronologically
sampled from a seawater site, two sites upstream, and at spawning. The 20% decrease in salmon body weight during the later
stages of migration was accompanied by large decreases (mg dry weight−1) in both glycogen (P < 0.01) and total muscle lipid (P < 0.01). In contrast, water content and protein concentration (mg dry weight−1) of the red muscle increased by 25 and 34%, respectively, at spawning. Enzymes of the glycolytic pathways demonstrated a
significant (P < 0.001) decrease in maximal activity as migration proceeded whereas enzymes of the oxidative phosphorylation pathways, specifically
the citric acid cycle enzymes, exhibited an increase (P < 0.001) in maximal activity at spawning. The antioxidant enzyme superoxide dismutase also demonstrated an increase (P < 0.001) in maximal activity during the latter stages of migration. These adaptations imply that the red epaxial muscle of
Atlantic salmon has a more efficient means of oxidizing lipids, while minimizing free radical damage, during the later stages
of migration and spawning, thereby potentially increasing post spawning survival. 相似文献
6.
Alvarez-González CA Moyano-López FJ Civera-Cerecedo R Carrasco-Chávez V Ortíz-Galindo JL Nolasco-Soria H Tovar-Ramírez D Dumas S 《Fish physiology and biochemistry》2010,36(1):29-37
The activities of several digestive enzymes during larval development of the spotted sand bass (Paralabrax maculatofasciatus) were evaluated using electrophoretic techniques. The results show the presence of three isoforms of alkaline protease from
day 2 after hatching (ah) and the early appearance of one pepsin-like band from day 12 ah onwards. In addition, two lipase
bands first appeared on day 2 ah, and there was a change in the molecular weight of one band from day 15 ah onwards. Several
α-amylase isoforms were observed from hatching up to day 5 ah. These results indicate that the important digestive enzymes
develop rapidly in these larvae, supporting the possibility of early weaning at day 12 ah using artificial diets. 相似文献
7.
8.
Within the framework of a larger project aimed to assess the potential of second generation hybrid striped bass for German
aquaculture the genotypic segregation of five microsatellite loci was analysed in two progeny lots (n = 74 and 76, respectively). There was no consistent correlation between microsatellite genotypes and phenotypic category
(white bass, hybrid, or striped bass). None of the individuals expressed neither only white bass nor only striped bass genotypes
at all five loci. On the other hand, only hybrid genotypes at all five loci were detected in three individuals of lot 1 and
four individuals of lot 2. Single loci tests for conformity of microsatellite genotypic segregation with Mendelian rules revealed
significant deviations (P < 0.05) in four cases for lot 1 and in three cases for lot 2. If pooled over all five loci, both lots displayed highly significant
deviations (P < 0.01) with an excess of hybrid genotypes and a deficiency of white bass genotypes. It is concluded that stabilizing selection
performed on hybrid genotypes might be a suitable approach for practical aquaculture in Europe if the goal is to become independent
of first generation hybrid fry supply and/or if establishing domesticated brood stocks of both parental species is impossible.
However, more detailed studies on the characteristics and performance of multiple hybrid generations are needed. 相似文献
9.
The present study aimed at determining the effect of cell volume changes on protein synthesis, measured as the incorporation
of [3H]leucine into acid-precipitable protein, in isolated hepatocytes of air-breathing walking catfish (Clarias batrachus). The rate of protein synthesis, which was recorded to be 10.02 ± 0.10 (n = 25) nmoles mg−1 cell protein h−1 in isotonic incubation conditions, increased/decreased significantly by 18 and 48%, respectively, following hypo- (−80 mOsmol l−1)/hypertonic (+80 mOsmol l−1) incubation conditions (adjusted with NaCl), with an accompanying increase/decrease of hepatic cell volume by 12 and 20%,
respectively. Similar cell volume-sensitive changes of protein synthesis were also observed when the anisotonicity of incubation
medium was adjusted with mannitol. Increase of hepatic cell volume by 9%, due to addition of glutamine plus glycine (5 mM
each) to the isotonic control incubation medium, led to a significant increase of protein synthesis by 14%. Decrease of hepatic
cell volume by 15 and 18%, due to addition of dibutyl-cAMP and adenosine in isotonic control incubation medium, led to a significant
decrease of protein synthesis by 30 and 34%, respectively. Thus, it appears that the increase/decrease of hepatic cell volume,
caused either by changing the extracellular osmolarity or by the presence of amino acids or certain other metabolites, leads
to increase/decrease of protein synthesis, respectively, and shows a direct correction (r = 0.99) between the hepatic cell volume and protein synthesis in walking catfish. These cell volume-sensitive changes of
protein synthesis probably help this walking catfish in fine tuning the different metabolic pathways for better adaptation
during cell volume changes and also to avoid the adverse affects of osmotic stress. This is the first report of cell volume-sensitive
changes of protein synthesis in hepatic cells of any teleosts. 相似文献
10.
Sung Hwoan Cho Choong-Il Kim In-Seok Park Young-Chae Song Chankeun Park Kyung-Duck Kim 《Fish physiology and biochemistry》2010,36(3):377-385
We have examined the effect of dietary nutrient composition on the growth, body composition and blood chemistry of juvenile
olive flounder (Paralichthys olivaceus) maintained on two different feeding regimes. Three experimental diets [HP (high protein), HE (high energy) and IPE (intermediate
protein and energy)] were crossed in a two-factor design with the two feeding regimes, which consisted of 2WS + 2WF (2-week
starvation and then 2-week feeding) and 4WS + 4WF (4-week starvation and then 4-week feeding)], for 8 weeks. The total days
of feeding in all treatments were the same. The final weight of fish was affected by feeding regime, but not by dietary nutrient
composition. Long-term starving and feeding (the 4WS + 4WF treatments) yielded higher growth than the alternating short-term
starving and feeding regime (2WS + 2WF treatments). The feed consumption of fish was affected by dietary nutrient composition,
but not by feeding regime, while the feed efficiency of fish was affected by feeding regime, but not by dietary nutrient composition.
Moisture, crude protein and crude lipid contents of the liver of the fish were affected by dietary nutrient composition, but
not by feeding regime. 相似文献
11.
R. M. Honji A. M. Narcizo M. I. Borella E. Romagosa R. G. Moreira 《Fish physiology and biochemistry》2009,35(1):109-123
Fecundity and oocyte development in Salminus hilarii female brood stock were analyzed with the aim of investigating the impact of migration impediment on oogenesis. Histological
analyses of the ovaries were performed in adult females caught in two different environments—the Tietê River (natural) and
captivity—and the gonadossomatic index, oocyte diameter and fecundity determined. Five germ cell development stages (oogonium,
perinucleolar, cortical alveoli, vitellogenic, ripe) and two other structures (postovulatory follicles and atretic oocytes)
were observed in females caught in the river. Captive animals lacked the ripe oocytes and postovulatory follicles and had
a relatively higher number of atretic oocytes. Females in captivity are known to produce larger oocytes, and they release
fewer eggs in each spawn (absolute fecundity) when compared with animals that are able to migrate. Our results suggest that
the Tietê River is undergoing alterations which are being reflected in the reproductive performance of S. hilarii, mainly due to the presence of atretic oocytes in females caught in the river. The lack of postovulatory follicles and ripe
oocytes in captive animals reveals that migratory impediment negatively impacts final oocyte maturation. However, the stage
of maturation reached is adequate for ovulation induction with hormone manipulation. 相似文献
12.
Remigiusz Panicz Paulina Hofsoe Jacek Sadowski Bartosz Mysłowski Mirosław Półgęsek 《Aquaculture International》2013,21(4):751-758
Among members of the Cyprinidae family, hybridisation is more widespread than in any other group of freshwater fish. Therefore, the aim of this work has been to use two different approaches, biometric and genetic, to assess differences between common carp (Cyprinus carpio) × goldfish (Carassius auratus) hybrids and their parents. Twenty-three length measurements of 10 fish from each group have been performed. Statistical analyses of results were conducted using Levene’s, ANOVA, NIR and Kruskal–Wallis tests. Genetic analysis has been conducted by means of amplified fragment length polymorphism (AFLP) technique. The AFLP allowed us to distinguish groups of fish and showed that hybrids had more in common with C. auratus than with C. carpio. 相似文献
13.
14.
The entire sequences of the mitochondrial (mt)DNA control region (CR) and portions of its flanking genes in the red crucian
carp (RC) and blunt snout bream (BSB) as well as their polyploid hybrids (3nRB, 4nRB and 5nRB) were determined and subjected
to a comparative analysis. The mtDNA-CRs of these five fish species ranged from 923 to 937 bp in length, they had the same
flanking gene arrangement as other vertebrates and the pattern of nucleotide substitution bias was also similar to that in
other vertebrates. Our data are consistent with the viewpoint of three domains [extended terminal associated sequence (ETAS
domain), central conserved sequence block domain and conserved sequence block (CSB) domain] within the mtDNA-CR of mammals.
On the basis our comparative analysis of the mtDNA-CRs of these five fish species, we were able to identify the consensus
sequences of functional conserved units, including the ETAS, CSB-F, CSB-D, CSB-E, CSB1, CSB2 and CSB3 and putative promoter.
The percentage of variable nucleotide positions (41.98%) in the central domain was lower than those in the ETAS and conserved
domain (71.70 and 47.12%, respectively), suggesting that the central domain was the most conserved part of the mtDNA-CR. These
results provide useful and important information for the further study of mtDNA-CR structure in fish. The sequence similarities
of mtDNA-CR among the 3nRB, 4nRB, 5nRB hybrids and their respective female parents were higher than those among the 3nRB,
4nRB, 5nRB hybrids and their respective male parents, providing the direct evidence of stringent maternal inheritance of mtDNA-CR
in the 3nRB, 4nRB and 5nRB hybrids. 相似文献
15.
Peng-Fei Zhao Fa-Jian Li Xiao-Ru Chen Yong-Jun Chen Shi-Mei Lin Lu Zhang Yun Li 《Aquaculture International》2016,24(5):1353-1364
The study was conducted to evaluate the effect of dietary lipid levels on growth, liver oxidative stress, and serum metabolites of juvenile hybrid snakehead (Channa argus × Channa maculata). Five isonitrogenous (crude protein 420 g kg?1) practical diets containing 58, 87, 115, 144, and 173 g kg?1 crude lipid (named L58, L87, L115, L144, and L173, respectively) were fed to triplicate groups of 30 fish (mean initial weight 24 g) for 8 weeks. The results showed that the final body weight (58.68–78.81 g), specific growth rate (1.41–1.75 % day?1), and protein efficiency ratio (1.66–2.64) increased significantly with the increasing dietary lipid levels. Liver lipid contents (71.65–101.80 g kg?1) and crude lipid (52.10–83.63 g kg?1) of whole body increased with increasing dietary lipid levels and reached the highest values in fish of L173. Fish of L173 showed lower alkaline phosphatase (23.81 King Unit gprot?1) and catalase activities (4.44 U mgprot?1) but higher malondialdehyde content (0.69 nmol mgprot?1) in liver than the other groups. Higher alanine transaminase activity (8.20 U L?1), aspartate transaminase activity (63.65 U L?1), and triglyceride (0.29 mmol L?1) in serum were observed in fish of L173 compared to the other treatments. Fish of L144 showed higher superoxide dismutase activity and glutathione peroxidase activities in liver than that of fish fed diet L58. Fish fed diet L58 showed lower total cholesterol (3.61 mmol L?1), high-density lipoprotein cholesterol (1.39 mmol L?1), and low-density lipoprotein cholesterol (0.46 mmol L?1) in serum. These results suggested that juvenile snakehead (Channa argus × Channa maculata) achieved good growth performance with dietary lipid level 173 g kg?1. Diet with 143 g kg?1 lipid was more conductive to liver health. The appropriate dietary lipid supplementation needs to be determined in further studies. 相似文献
16.
A 4-week study was conducted to determine the effect of starvation on activities and mRNA expression of lipoprotein lipase
(LPL) and hormone-sensitive lipase (HSL) in hybrid tilapia (Oreochromis niloticus × O. areus). The tissue samples were sampled once a week. Results showed that body weight (BW) and hepatosomatic index (HSI) were decreased
significantly (P < 0.05) during starvation. The percentages of crude fat and crude protein in the whole body and the fat content in muscle
decreased significantly (P < 0.05), while the rate of moisture and crude ash increased significantly (P < 0.05). The response of LPL, HSL activities and mRNA expression in tissues was tissue dependent. The activities of LPL and
HSL in muscle at day 7 were elevated by 2.5 times (P < 0.05) and 11.8 times (P < 0.05) of the value at day 0, respectively, and both then decreased to pre-starvation levels at day 14 and finally stabilized
at a certain level afterward. LPL and HSL mRNA abundance in muscle remained relatively stable between 0 and 14 day; then,
a significant increase was seen after 14 days. In the liver, LPL activity maintained a significantly increasing trend during
starvation, while HSL activity rose dramatically at day 7 of starvation by 2.35 times (P < 0.05) and finally stabilized at a certain level. The mRNA abundance of liver LPL increased significantly during the whole
process of starvation (P < 0.05), whereas the mRNA abundance of liver HSL decreased significantly at day 7 of starvation, elevating significantly
afterward (P < 0.05). 相似文献
17.
为了实现由应试教育向素质教育的转变 ,适应现代社会对高素质人才的需要 ,必须加强素质教育 ,而实现素质教育的核心问题是提高课堂教学质量 ,因此 ,创设最优化课堂教学、促进学生个性健康发展和素质的全面提高是极其必要的。本文拟就这一问题 ,举《淡水生物学》教学中之例 ,谈谈粗浅的“五字法”。一、精指授课“精”和板书“精”。1、授课“精”。教师讲课时照本宣科 ,会使学生无所适从 ,觉得枯燥乏味 ,甚至于“丢了西瓜 ,拣了芝麻”。因此 ,教师应深入钻研教材 ,挖掘课程体系 ,找出每章、每节课的难点和重点 ,分清轻重、强弱 ,强化重点和… 相似文献
18.
In this study we examined the endocrine mediation between environmental factors (temperature and photoperiod) and the brain–pituitary–gonadal
axis in females of pejerrey Odontesthes bonariensis. Changes in the expression of brain gonadotropin-releasing hormones (GnRHs) and gonadotropin (GtH) subunit [follicle stimulating-β
(FSH-β), luteinizing hormone-β (LH-β), glycoprotein hormone-α (GPH-α)] genes, plasma gonadal steroids [estradiol (E2) and testosterone (T)], gonadal histology, and gonadosomatic index (GSI) in adult females exposed to combinations of short-day
(8 h) or long-day (16 h) photoperiods and low (12°C) or high (20°C) temperatures after winter conditions (8 h light, 12°C)
were analyzed. Pejerrey females kept under the short photoperiod had low GSIs, and their ovaries contained only previtellogenic
oocytes regardless of the experimental temperature. In contrast, females exposed to the long photoperiod had high GSIs and
ovaries with vitellogenic oocytes at both temperatures. These fish also showed a significantly higher expression of sGnRH,
pjGnRH, cGnRH-II (the three different GnRH variants found to date in the pejerrey brain), FSH-β, LH-β and GPH-α genes and
plasma E2 levels than those at the shorter photoperiod. No significant changes were observed in plasma T levels. Based on these results,
we concluded that the increase in day length but not that of temperature triggers the maturation of pejerrey females after
the winter period of gonadal rest and that this occurs by an integrated stimulation of the various components of the brain–pituitary–gonad
axis. 相似文献
19.
Qingmei Zheng Chunyan Han Yanmei Zhong Rushu Wen Ming Zhong 《Fish physiology and biochemistry》2017,43(2):361-371
An 8-week feeding trial was conducted to evaluate the effects of dietary supplementation with green tea waste (GTW) on growth, digestive enzyme and lipid metabolism of juvenile hybrid tilapia, Oreochromis niloticus × O. aureus. The fish (initial mean body weight, 12.63 ± 0.75 g) were fed five experimental diets that included 0 (control), 0.8, 1.6, 3.2 or 6.4 % of GTW in triplicate aquaria, twice daily. Growth performance, plasma metabolites content and liver and intestine digestive enzyme activities were determined. Fish accepted well all experimental diets during the trial, and no mortality was observed. The weight gain increased (P < 0.05) with the increase in GTW inclusion level up to 1.6 %, after which it decreased, but no significant differences between the control and high level (3.2 or 6.4 % of GTW) groups were observed. Moreover, fish fed on diets containing 0.8 and 1.6 % GTW had lower feed conversion ratio (FCR, 1.75 and 1.73, respectively) and had better protein deposition (higher protein efficiency ratio, PER, 1.73 and 1.71, respectively), compared to other treatments. No differences among groups were observed in whole body and dorsal muscle composition with the exception of lipid content which was lower in fish fed 6.4 % GTW diets, compared to other treatments. Lipase activities in liver or intestine were higher in fish fed GTW-supplemented diets with the exception of intestine lipase activities, which was unaffected, compared to the control. Similarly, liver lipoprotein lipase activities were also increased in fish fed diets supplemented a medium dose of GTW (1.6 or 3.2 %), compared to other treatments. However, intestine amylase activities were decreased in fish fed diets containing a high dose of GTW (3.2 and 6.4 %); while the liver amylase activities were unaffected by the GTW supplementation. Blood chemistry parameters were affected by GTW inclusion, except the values of triglycerides, which was unaffected. The values of total cholesterol, HDL cholesterol and LDL cholesterol increased with increasing GTW inclusion level up to 3.2 %, after which the values decreased. These results indicate that diets supplemented with appropriate concentration of GTW (from 0.8 to 1.6 %) may potentially serve as an effective functional food and additive for tilapia to improve growth performance, digestion efficacy and fat metabolism. 相似文献
20.
To investigate the effects of different carbohydrate (CHO) levels in the diet of top-mouth culter Erythroculter ilishaeformis Bleeker, fish were randomly divided into five treatment groups. A control group was fed a diet with no CHO, and four treatment
groups were fed with 14, 21, 27, and 34 % CHO, respectively, for 70 days. Serum cortisol level, glucose concentration, alanine
aminotransferase activity, and malondialdehyde content of fish offered the diet containing 27 % CHO or 34 % CHO were significantly
greater than those of fish offered the diet containing 14 % CHO or 21 % CHO. Serum lysozyme activity, total antioxidation
capacity, and superoxide dismutase activity of fish offered the diet containing 27 % CHO or 34 % CHO also were significantly
lower than those of fish offered the diet containing 14 % CHO. The relative levels of hepatic heat shock cognate protein 70
messenger RNA (mRNA) of fish offered the diet containing 27 % CHO after being deprived of food for 48 h or 34 % CHO at 48 h
after feeding were significantly higher than those of fish offered the diet containing 21 % CHO or 14 % CHO. The results of
this study suggest that ingestion of 27 or 34 % dietary CHO can impact the nonspecific immune ability of E. ilishaeformis and also cause metabolic stress. 相似文献